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.github/workflows/build.yamldeleted−26
since splitsnapshots
unifiedsplit
@@ -1,26 +0,0 @@
1−name: Build
2−on: [push, pull_request, release]
3−jobs:
4− build:
5− runs-on: ubuntu-latest
6− steps:
7− - uses: actions/checkout@v2.3.4
8− with:
9− persist-credentials: false
10− submodules: true
11−
12− - uses: cachix/install-nix-action@v14.1
13− with:
14− nix_path: nixpkgs=channel:nixos-unstable
15− extra_nix_config: |
16− trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=
17− substituters = https://cache.nixos.org/ https://cache.iog.io
18−
19− - uses: cachix/cachix-action@v10
20− with:
21− name: rel8
22− authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
23−
24− - run: nix-build -A hsPkgs.rel8.components.library
25− - run: nix-build -A hsPkgs.rel8.checks.tests
26− - run: nix-build shell.nix
Changelog.mddeleted−159
@@ -1,159 +0,0 @@
1−# 1.4.0.0 (2002-08-17)
2−
3−## Breaking changes
4−
5−* The behavior of `greatest`/`least` has been corrected, and was previously flipped. ([#183](https://github.com/circuithub/rel8/pull/183))
6−
7−## New features
8−
9−* `NullTable`/`HNull` have been added. This is an alternative to `MaybeTable` that doesn't use a tag columns. It's less flexible (no `Functor` or `Applicative` instance) and is meaningless when used with a table that has no non-nullable columns (so nesting `NullTable` is redundant). But in situations where the underlying `Table` does have non-nullable columns, it can losslessly converted to and from `MaybeTable`. It is useful for embedding into a base table when you don't want to store the extra tag column in your schema. ([#173](https://github.com/circuithub/rel8/pull/173))
10−* Add `fromMaybeTable`. ([#179](https://github.com/circuithub/rel8/pull/179))
11−* Add `alignMaybeTable`. ([#196](https://github.com/circuithub/rel8/pull/196))
12−
13−## Improvements
14−
15−* Optimize implementation of `AltTable` for `Tabulation` ([#178](https://github.com/circuithub/rel8/pull/178))
16−
17−## Other
18−
19−* Documentation improvements for `HADT`. ([#177](https://github.com/circuithub/rel8/pull/177))
20−* Document example usage of `groupBy`. ([#184](https://github.com/circuithub/rel8/pull/184))
21−* Build with and require Opaleye >= 0.9.3.3. ([#190](https://github.com/circuithub/rel8/pull/190))
22−* Build with `hasql` 1.6. ([#195](https://github.com/circuithub/rel8/pull/195))
23−
24−# 1.3.1.0 (2022-01-20)
25−
26−## Other
27−
28−* Rel8 now requires Opaleye >= 0.9.1. ([#165](https://github.com/circuithub/rel8/pull/165))
29−
30−# 1.3.0.0 (2022-01-31)
31−
32−## Breaking changes
33−
34−* `div` and `mod` have been changed to match Haskell semantics. If you need the PostgreSQL `div()` and `mod()` functions, use `quot` and `rem`. While this is not an API change, we feel this is a breaking change in semantics and have bumped the major version number. ([#155](https://github.com/circuithub/rel8/pull/155))
35−
36−## New features
37−
38−* `divMod` and `quotRem` functions have been added, matching Haskell's `Prelude` functions. ([#155](https://github.com/circuithub/rel8/pull/155))
39−* `avg` and `mode` aggregation functions to find the mean value of an expression, or the most common row in a query, respectively. ([#152](https://github.com/circuithub/rel8/pull/152))
40−* The full `EqTable` and `OrdTable` classes have been exported, allowing for instances to be manually created. ([#157](https://github.com/circuithub/rel8/pull/157))
41−* Added `like` and `ilike` (for the `LIKE` and `ILIKE` operators). ([#146](https://github.com/circuithub/rel8/pull/146))
42−
43−## Other
44−
45−* Rel8 now requires Opaleye 0.9. ([#158](https://github.com/circuithub/rel8/pull/158))
46−* Rel8's test suite supports Hedgehog 1.1. ([#160](https://github.com/circuithub/rel8/pull/160))
47−* The documentation for binary operations has been corrected. ([#162](https://github.com/circuithub/rel8/pull/162))
48−
49−# 1.2.2.0 (2021-11-21)
50−
51−## Other
52−
53−* Support GHC 9.2 ([#145](https://github.com/circuithub/rel8/pull/145))
54−* Correct the documentation for `except` ([#147](https://github.com/circuithub/rel8/pull/147))
55−* Support `hasql` 1.5 ([#149](https://github.com/circuithub/rel8/pull/149))
56−
57−# 1.2.1.0 (2021-11-21)
58−
59−## New features
60−
61−* `castTable` has been added, which casts all columns selected from in `Query` according to the types of columns. This can occasionally be useful when using `many`/`some` on older PostgreSQL versions. ([#137](https://github.com/circuithub/rel8/pull/137))
62−
63−* Added `<:`, `<=:`, `>:`, `>=:`, `greatest` and `least`, which sort all columns in a table lexicographically. These operators are like the `<.` operators which operate on `Expr`s, but the `<:` operate on entire tables. ([#139](https://github.com/circuithub/rel8/pull/139))
64−
65−## Other
66−
67−* Support opaleye-0.8 ([#142](https://github.com/circuithub/rel8/pull/142))
68−
69−# 1.2.0.0 (2021-10-22)
70−
71−## New features
72−
73−* New `$*` and `$+` operators for projecting out of `ListTable` and `NonEmptyTable` respectively (analogous to the existing `$?` for `MaybeTable`). ([#125](https://github.com/circuithub/rel8/pull/125))
74−
75−## Bug fixes
76−
77−* Fix `UPSERT` support (and add tests), which was broken due to a typo inside Rel8 that made it impossible to construct `Projection`s which are needed by `UPSERT`. ([#134](https://github.com/circuithub/rel8/pull/134))
78−
79−* Remove `DBMin` and `DBMax` instances for `Bool`, which are invalid as far as Postgres is concerned. `and` and `or` can be used to achieve the same thing. ([#126](https://github.com/circuithub/rel8/pull/126))
80−
81−* Fix `aggregateMaybeTable`, `aggregateEitherTable` and `aggregateTheseTable`, which generated invalid SQL previously. ([#127](https://github.com/circuithub/rel8/pull/127))
82−
83−## Breaking changes
84−
85−* `rebind` now takes an additional argument for the "name" of the binding. ([#128](https://github.com/circuithub/rel8/pull/128))
86−
87−# 1.1.0.0 (2021-07-16)
88−
89−## New features
90−
91−* You can derive `Rel8able` for "vanilla" higher-kinded data types - data types that don't use the `Column` type family. For example, the following is now possible:
92−
93− ```haskell
94− data MyTable f = MyTable
95− { myTableX :: f Int32
96− , myTableY :: f Text
97− } deriving (Generic, Rel8able)
98− ```
99−
100−* The `Projectable` and `Biprojectable` type classes have been introduced. These classes model a type of functors and bifunctors (respectively) on tables, where the mapping function is only able to rearrange columns. For example, the following is now possible:
101−
102− ```haskell
103− x <- project myTableX <$> many ...
104− ```
105−
106−* `Insert`'s `onConflict` field now has a new option - `DoUpdate`. This maps to PostgreSQL's `ON CONFLICT DO UPDATE` syntax, which provides upsert support. ([#85](https://github.com/circuithub/rel8/pull/85))
107−
108−* `Insert`, `Update` and `Delete` has all been expanded to work with `Query`s. In particular:
109−
110− * `Delete` now supports a `USING` sub-query
111− * `Update` now supports a `FROM` sub-query
112− * `Insert` can delete the result of any arbitrary `Query` (providing the types match)
113−
114−* The new `Rel8.Tabulate` module has been added, which gives a `Map`-esque interface to writing and composing queries. ([#70](https://github.com/circuithub/rel8/pull/70))
115−
116−* The new `indexed` `Query -> Query` function was added. This function augments each row in a query with it's 0-based index. ([#117](https://github.com/circuithub/rel8/pull/117))
117−
118−## Breaking changes
119−
120−* `Insert`, `Delete` and `Update` have all changed. In particular, for `Insert` users should now replace `rows = xs` with `rows = values xs`. ([#85](https://github.com/circuithub/rel8/pull/85))
121−
122−* Rename `whereExists` and `whereNotExists` to `present` and `absent` respectively. ([#57](https://github.com/circuithub/rel8/pull/57))
123−
124−* Simplify `evaluate` to run directly inside the `Query` monad, rendering the `Evaluate` monad unnecessary. ([#56](https://github.com/circuithub/rel8/pull/56))
125−
126−* The `Labelable` type class has been removed as it's no longer necessary. This class was mostly internal, though was visible in some public API functions. ([#76](https://github.com/circuithub/rel8/pull/76))
127−
128−* `EitherTable`, `ListTable`, `MaybeTable`, `NonEmptyTable` and `TheseTable` now all have an extra parameter which tracks the context of the table. If you manually specified any types before, you need to provide this parameter - usually `Expr` will be the correct choice. ([#101](https://github.com/circuithub/rel8/pull/101))
129−
130−* We've done a lot of work to simplify the internals of Rel8, but some of these are breaking changes. However, most of these API changes shouldn't affect users as they are mostly types used in type inference, or affect classes where users don't need to define their own instances.
131−
132− * The kind of a `Rel8able` is now `(Type -> Type) -> Type`. Previously it was `(X -> Type) -> Type`.
133− * `Table` has a new associated type - `FromExprs`. This was previously an open type family.
134− * `Table` has a new associated type - `Transpose` - and `Recontextualise` has been renamed to `Transposes`. This `Transposes` class now operates in terms of `Transpose`.
135−
136−* `select`, `insert`, `update` and `delete` now produce Hasql `Statement`s, rather than actually running the statement as IO. This allows Rel8 to be used with transaction/connection-managing monads like [`hasql-transaction`](https://hackage.haskell.org/package/hasql-transaction). ([#94](https://github.com/circuithub/rel8/pull/94))
137−
138−## Bug fixes
139−
140−* Fixes a bug where cartesian products of queries using `catListTable`, `catNonEmptyTable`, `catList` and `catNonEmpty` would incorrectly be zipped instead. ([#61](https://github.com/circuithub/rel8/pull/61))
141−
142−* Require Opaleye 0.7.3.0. This version has better support for lateral queries, which can improve query plans, especially in `optional`/`LEFT JOIN` ([#72](https://github.com/circuithub/rel8/pull/72))
143−
144−* Rel8 now compiles with GHC 9. ([#97](https://github.com/circuithub/rel8/pull/97))
145−
146−## Other changes
147−
148−* `exists` is now implemented in terms of the SQL `EXISTS` keyword. ([#69](https://github.com/circuithub/rel8/pull/69))
149−
150−* `alignBy` no longer requires `Table`s. ([#67](https://github.com/circuithub/rel8/pull/67))
151−
152−
153−# 1.0.0.1 (2021-06-21)
154−
155−This release contains various fixes for documentation.
156−
157−# 1.0.0.0 (2021-06-18)
158−
159−* Initial release.
Doctest.hsnew file+53
@@ -0,0 +1,53 @@
1+{-# language BlockArguments #-}
2+{-# language OverloadedStrings #-}
3+
4+module Main where
5+
6+-- base
7+import Control.Exception ( bracket, throwIO )
8+import Data.Foldable ( traverse_ )
9+import System.Environment ( lookupEnv, setEnv )
10+
11+-- base-compat
12+import System.Environment.Compat ( unsetEnv )
13+
14+-- bytestring
15+import Data.ByteString.Char8 ( unpack )
16+
17+-- doctest
18+import Test.DocTest ( doctest )
19+
20+-- hasql
21+import Hasql.Connection ( acquire, release )
22+import Hasql.Session ( run, sql )
23+
24+-- rel8
25+import Build_doctests ( flags, module_sources, pkgs )
26+
27+-- tmp-postgres
28+import Database.Postgres.Temp ( toConnectionString, verboseConfig, with, withConfig )
29+
30+
31+main :: IO ()
32+main = do
33+ nixGhcLibdir <- lookupEnv "NIX_GHC_LIBDIR"
34+ unsetEnv "GHC_ENVIRONMENT"
35+ either throwIO return =<< with \db -> do
36+ setEnv "TEST_DATABASE_URL" (unpack (toConnectionString db))
37+ bracket (either (error . show) return =<< acquire (toConnectionString db)) release \conn -> do
38+ flip run conn do
39+ sql "create table author ( author_id serial primary key, name text not null, url text )"
40+ sql "create table project ( author_id int not null references author (author_id), name text not null )"
41+
42+ sql "insert into author ( name, url ) values ( 'Ollie', 'https://ocharles.org.uk' )"
43+ sql "insert into author ( name, url ) values ( 'Bryan O''Sullivan', null )"
44+ sql "insert into author ( name, url ) values ( 'Emily Pillmore', 'https://cohomolo.gy' )"
45+ sql "insert into project ( author_id, name ) values ( 1, 'rel8' )"
46+ sql "insert into project ( author_id, name ) values ( 2, 'aeson' )"
47+ sql "insert into project ( author_id, name ) values ( 2, 'text' )"
48+
49+ doctest (args nixGhcLibdir)
50+
51+ where
52+ args nixGhcLibdir =
53+ flags ++ pkgs ++ foldMap (\x -> ["-package-db" <> x <> "/package.conf.d"]) nixGhcLibdir ++ module_sources
LICENSE+1−1
@@ -1,4 +1,4 @@
1−Copyright 2021 Oliver Charles
1+Copyright 2020 Oliver Charles
2
2
3All rights reserved.
3All rights reserved.
4
4
README.mddeleted−17
@@ -1,17 +0,0 @@
1−# Welcome!
2−
3−Welcome to Rel8! Rel8 is a Haskell library for interacting with PostgreSQL databases, built on top of the fantastic Opaleye library.
4−
5−The main objectives of Rel8 are:
6−
7−* *Conciseness*: Users using Rel8 should not need to write boiler-plate code. By using expressive types, we can provide sufficient information for the compiler to infer code whenever possible.
8−
9−* *Inferrable*: Despite using a lot of type level magic, Rel8 aims to have excellent and predictable type inference.
10−
11−* *Familiar*: writing Rel8 queries should feel like normal Haskell programming.
12−
13−Rel8 was presented at ZuriHac 2021. If you want to have a brief overview of what Rel8 is, and a tour of the API - check out the video below:
14−
15−[![Rel8 presentation at ZuriHac 2021](https://img.youtube.com/vi/3uwrtjxiq6E/hqdefault.jpg)](http://www.youtube.com/watch?v=3uwrtjxiq6E)
16−
17−For more details, check out the [official documentation](https://rel8.readthedocs.io/en/latest/).
Setup.hsnew file+6
@@ -0,0 +1,6 @@
1+module Main where
2+
3+import Distribution.Extra.Doctest (defaultMainWithDoctests)
4+
5+main :: IO ()
6+main = defaultMainWithDoctests "doctests"
cabal.project.haskell-nixdeleted−4
@@ -1,4 +0,0 @@
1−-- Haskell.nix overrides. We don't put these in cabal.project, because Cabal
2−-- will interpret them as local packages, and try to build them when we cabal
3−-- build. The only reason we have to specify these is for Haskell.nix to know to
4−-- override these packages by fetching them rather than using Hackage.
default.nix+5−7
@@ -1,26 +1,24 @@
1−let
1+let
2 haskellNix = import (import ./nix/sources.nix)."haskell.nix" {};
2 haskellNix = import (import ./nix/sources.nix)."haskell.nix" {};
3
3
4− nixpkgsSrc = haskellNix.sources.nixpkgs-unstable;
4+ nixpkgsSrc = haskellNix.sources.nixpkgs-2009;
5
5
6 nixpkgsArgs = haskellNix.nixpkgsArgs;
6 nixpkgsArgs = haskellNix.nixpkgsArgs;
7
7
8− compiler-nix-name = "ghc924";
8+ compiler-nix-name = "ghc8103";
9
9
10 pkgs = import nixpkgsSrc nixpkgsArgs;
10 pkgs = import nixpkgsSrc nixpkgsArgs;
11
11
12−in
12+in
13pkgs.haskell-nix.project {
13pkgs.haskell-nix.project {
14 inherit compiler-nix-name;
14 inherit compiler-nix-name;
15
15
16− cabalProjectLocal = builtins.readFile ./cabal.project.haskell-nix;
17−
18 src = pkgs.haskell-nix.haskellLib.cleanGit {
16 src = pkgs.haskell-nix.haskellLib.cleanGit {
19 name = "rel8";
17 name = "rel8";
20 src = ./.;
18 src = ./.;
21 };
19 };
22
20
23− modules = [
21+ modules = [
24 { packages.rel8 = {
22 { packages.rel8 = {
25 preCheck = ''
23 preCheck = ''
26 export PATH="${pkgs.postgresql}/bin:${"$PATH"}"
24 export PATH="${pkgs.postgresql}/bin:${"$PATH"}"
docs/Makefiledeleted−19
@@ -1,19 +0,0 @@
1−# Minimal makefile for Sphinx documentation
2−#
3−
4−# You can set these variables from the command line.
5−SPHINXOPTS =
6−SPHINXBUILD = sphinx-build
7−SOURCEDIR = .
8−BUILDDIR = _build
9−
10−# Put it first so that "make" without argument is like "make help".
11−help:
12− @$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
13−
14−.PHONY: help Makefile
15−
16−# Catch-all target: route all unknown targets to Sphinx using the new
17−# "make mode" option. $(O) is meant as a shortcut for $(SPHINXOPTS).
18−%: Makefile
19− @$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
docs/concepts/dbtype.rstdeleted−175
@@ -1,175 +0,0 @@
1−``DBType``
2−==========
3−
4−The ``DBType`` type class provides a bridge between database expression values
5−and Haskell values. Rel8 comes with stock instances for most types that come
6−predefined with PostgreSQL, such as `int4` (which is represented as by
7−``Data.Int.Int32``) and timestamptz (which is ``UTCTime`` from ``Data.Time``).
8−This means that you need at least one ``DBType`` instance per database type,
9−though most of these primitive ``DBType``\s should already be available.
10−
11−Combining ``newtype`` and ``DBType``
12−------------------------------------
13−
14−You can define new instances of ``DBType`` by using Haskell "generalized
15−newtype deriving" strategy. This is useful when you have a common database
16−type, but need to interpret this type differently in different contexts. A very
17−common example here is with auto-incrementing ``id`` counters. In PostgreSQL,
18−it's common for a table to have a primary key that uses the ``serial`` type,
19−which means the key is an ``int8`` with a default value for ``INSERT``. In
20−Rel8, we could use ``Int64`` (as ``Int64`` is the ``DBType`` instance for
21−``int8``), but we can be even clearer if we make a ``newtype`` for each *type*
22−of id.
23−
24−If our database has users and orders, these tables might both have ids, but
25−they are clearly not meant to be treated as a common type. Instead, we can make
26−these types clearly different by writing::
27−
28− newtype UserId = UserId { getUserId :: Int64 }
29− deriving newtype DBType
30−
31− newtype OrderId = OrderId { getOrderId :: Int64 }
32− deriving newtype DBType
33−
34−Now we can use ``UserId`` and ``OrderId`` in our Rel8 queries and definitions,
35−and Haskell will make sure we don't accidentally use an ``OrderId`` when we're
36−looking up a user.
37−
38−If you would like to use this approach but can't use generalized newtype
39−deriving, the same can be achived by using ``mapTypeInformation``::
40−
41− instance DBType UserId where
42− typeInformation = mapTypeInformation UserId getUserId typeInformation
43−
44−Parsing with ``DBType``
45−-----------------------
46−
47−``DBType``\s can also *refine* database types with parsing, which allows you to
48−map more structured Haskell types to a PostgreSQL database. This allows you to
49−use the capabalities of Haskell's rich type system to make it harder to write
50−incorrect queries. For example, we might have a database where we need to store
51−the status of an order. In Haskell, we might write:
52−
53−.. code-block:: haskell
54−
55− data OrderStatus = PaymentPending | Paid | Packed | Shipped
56−
57−In our PostgreSQL we have a few choices, but for now we'll assume that they are
58−stored as ``text`` values.
59−
60−In order to use this type in Rel8 queries, we need to write an instance of
61−``DBType`` for ``OrderStatus``. One approach is to use
62−``parseTypeInformation``, which allows you to refine an existing ``DBType``::
63−
64− instance DBType OrderStatus where
65− typeInformation = parseTypeInformation parser printer typeInformation
66− where
67− parser :: Text -> Either String OrderStatus
68− parser "PaymentPending" = Right PaymentPending
69− parser "Paid" = Right Paid
70− parser "Packed" = Right Packed
71− parser "Shipped" = Right Shipped
72− parser other = Left $ "Unknown OrderStatus: " <> unpack other
73−
74− printer :: OrderStatus -> Text
75− printer PaymentPending = "PaymentPending"
76− printer Paid = "Paid"
77− printer Packed = "Packed"
78− printer Shipped = "Shipped"
79−
80−Deriving ``DBType`` via ``ReadShow``
81−------------------------------------
82−
83−The ``DBType`` definition for ``OrderStatus`` above is a perfectly reasonable
84−definition, though it is quite verbose and tedious. Rel8 makes it easy to map
85−Haskell types that are encoded using ``Read``/``Show`` via the ``ReadShow``
86−wrapper. An equivalent ``DBType`` definition using ``ReadShow`` is::
87−
88− data OrderStatus = PaymentPending | Paid | Packed | Shipped
89− deriving stock (Read, Show)
90− deriving DBType via ReadShow OrderStatus
91−
92−Storing structured data with ``JSONEncoded``
93−--------------------------------------------
94−
95−It can occasionally be useful to treat PostgreSQL more like a document store,
96−storing structured documents as JSON objects. Rel8 comes with support for
97−serializing values into structured representations through the ``JSONEncoded``
98−and ``JSONBEncoded`` deriving-via helpers.
99−
100−There usage is very similar to ``ReadShow`` - simply derive ``DBType via
101−JSONEncoded``, and Rel8 will use ``ToJSON`` and ``FromJSON`` instances (from
102−``aeson``) to serialize the given type.
103−
104−For example, a project might use event sourcing with a table of events. Each
105−row in this table is an event, but this event is stored as a JSON object. We
106−can use this type with Rel8 by writing::
107−
108− data Event = UserCreated UserCreatedData | OrderCreated OrderCreatedData
109− deriving stock Generic
110− deriving anyclass (ToJSON, FromJSON)
111− deriving DBType via JSONBEncoded Event
112−
113−Here we used ``JSONBEncoded``, which will serialize to PostgreSQL ``jsonb``
114−(binary JSON) type, which is generally the best choice.
115−
116−The ``DBType`` subtypes
117−-----------------------
118−
119−``DBEq``
120−^^^^^^^^
121−
122−The ``DBEq`` type class represents the subclass of database types that support
123−equality. By supporting equality, we mean that a type supports the ``=``
124−operator, and also has a suitable notion of equality for operations like
125−``GROUP BY`` and ``DISTINCT``. On the one hand, this class is like Haskell's
126−``Eq`` type class. The main difference is that this class has no methods.
127−
128−``DBOrd``
129−^^^^^^^^^
130−
131−The ``DBOrd`` type class represents the subclass of database types that support
132−the normal comparison operators - ``<``, ``<=``, ``>=`` and ``>``.
133−
134−``DBMax`` and ``DBMin``
135−^^^^^^^^^^^^^^^^^^^^^^^
136−
137−The type classes indicate that a database type supports the ``min()`` and
138−``max()`` aggregation functions.
139−
140−``DBSemigroup`` and ``DBMonoid``
141−^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
142−
143−These type classes exist to give Rel8's API a similar feel to Haskell
144−programming. Many database types have a sensible monoid structure, with the
145−presence of a ``mempty``-like expression, and an associative operation to
146−combine ``Expr``\s.
147−
148−``DBNum``, ``DBIntegral`` and ``DBFractional``
149−^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
150−
151−These type classes are used to present a familiar numeric type hierarchy for
152−Haskell programmers.
153−
154−``DBNum``
155− This class indicates that a type supports the ``+``, ``-``, and ``*``
156− operators, along with the ``abs()``, ``negate()`` and ``sign()`` functions.
157− Database types that are instances of ``DBNum`` allow ``Num (Expr a)`` to be
158− used (allowing you to combine expressions with Haskell's normal ``+``
159− function).
160−
161−``DBIntegral``
162− If a type is an instance of ``DBIntegral``, it means that the type stores
163− integral (whole) numbers. The ``Rel8.Expr.Num`` module provides familiar
164− ``Expr`` functions like ``fromIntegral`` to convert between types.
165−
166−``DBFractional``
167− If a type is an instance of ``DBFraction``, it means that the type supports
168− the ``/`` operator, and literals can be created via Haskell's ``Rational``
169− type class. This type class provides the ``Fracitonal (Expr a)`` instance.
170−
171−``DBString``
172−^^^^^^^^^^^^
173−
174−This type class indicates that a database type supports the ``string_agg()``
175−aggregation function.
docs/concepts/expr.rstdeleted−74
@@ -1,74 +0,0 @@
1−``Expr`` and ``Sql``
2−====================
3−
4−``Expr``
5−--------
6−
7−Now that we've seen how types are bridged between a database and Haskell via
8−``DBType``, we can start looking at how expressions are modelled. In Rel8, any
9−expression will be a value of the form ``Expr a``, where ``a`` is the type of
10−the expression. For example, the SQL expression ``user.id = 42`` is an ``Expr
11−Bool``, and the subexpressions ``user.id`` and ``42`` might be ``Expr
12−UserId``\s.
13−
14−``Expr``\s are usually created by combining other ``Expr``\s together, like
15−using numeric operations like `+` and `*`, or by quoting Haskell values into
16−queries with ``lit``. Continuing with the example of ``user.id = 42``, we can
17−write this in Rel8 as::
18−
19− userId ==. lit (UserId 42)
20−
21−Here it's assumed that a ``userId :: Expr UserId`` expression is already in
22−scope, and we can compare that against another ``Expr UserId`` using the ``==.``
23−operator (which is like Haskell's normal ``==`` operator, but lifted to work on
24−``Expr``). The expression ``lit (UserId 42)`` quotes the Haskell term ``UserId
25−42`` literally as the SQL expression ``42``. This particular encoding is chosen
26−because ``UserId`` is simply a ``newtype`` around ``Int64``.
27−
28−``null``
29−--------
30−
31−So far we've only talked about ``DBType``, which represents database types
32−*excluding* ``null``. Rel8 chooses this encoding because ``null`` is rather
33−special in SQL, and doesn't really constitute a distinct type. For example,
34−there is no SQL notion of "stacking" nulls - which is to say a type like ``Maybe
35−(Maybe UserId))`` has no real analogous type in SQL.
36−
37−Of course, as ``null`` is pervasive in SQL queries, Rel8 does support ``null`` -
38−simply wrap up your type in ``Maybe``. ``Nothing`` will be translated as
39−``null``, and ``Just`` is used to represent non-null values.
40−
41−Rel8 comes with a set of functions to work with ``null`` values thash should
42−feel familiar to Haskell programmers:
43−
44−* ``null`` creates null values (you can also use ``lit Nothing``).
45−* ``nullify`` turns an ``Expr a`` into a ``Expr (Maybe a)`` (like ``Just``).
46−* ``nullable`` allows you to eliminate null values, like the ``maybe`` function.
47−* ``isNull`` and ``isNonNull`` work like ``isNothing`` and ``isJust``,
48− respectively.
49−* ``mapNullable`` is like ``fmap`` for ``Maybe``, and allows you to map over
50− non-null values.
51−* ``liftOpNullable`` is like ``liftA2`` for ``Maybe``, and allows you to combine
52− expressions together, given a way to combine non-null expressions.
53−
54−``SQL`` and null-polymorphic expressions
55−----------------------------------------
56−
57−Through the API reference documentation for Rel8, you might encounter the
58−``Sql`` type class. For example, if we look at the type of ``litExpr``, we
59−have::
60−
61− litExpr :: Sql DBType a => a -> Expr a
62−
63−Here ``Sql DBType a`` means that ``a`` can either be literally a type that has
64−an instance of ``DBType`` (like ``UserId`` or ``Bool``), *or* that same type
65−wrapped in ``Maybe`` (so ``Maybe UserId`` or ``Maybe Bool``). ``Maybe`` here
66−encodes the SQL concept of ``null``.
67−
68−Some functions work regardless of whether or not a value is null, and in these
69−cases you'll see ``Sql DBType a``. ``Sql`` can be used with any ``DBType``
70−subtype. For example, the type of ``div`` is::
71−
72− div :: Sql DBIntegral a => Expr a -> Expr a -> Expr a
73−
74−Which means ``div`` works on any ``DBIntegral a``, including ``Maybe a``.
docs/concepts/insert.rstdeleted−181
@@ -1,181 +0,0 @@
1−``INSERT``, ``UPDATE`` and ``DELETE``
2−=====================================
3−
4−While the majority of Rel8 is about building and executing ``SELECT``
5−statement, Rel8 also has support for ``INSERT``, ``UPDATE`` and ``DELETE``.
6−These statements are all executed using the ``insert``, ``update`` and
7−``delete`` functions, all of which take a record of parameters.
8−
9−.. note::
10−
11− This part of Rel8's API uses the ``DuplicateRecordFields`` language
12− extension. In code that needs to use this API, you should also enable this
13− language extension, or you may get errors about ambiguous field names.
14−
15−``DELETE``
16−----------
17−
18−To perform a ``DELETE`` statement, construct a ``Delete`` value and execute it
19−using ``delete``. ``Delete`` takes:
20−
21−``from``
22− The ``TableSchema`` for the table to delete rows from.
23−
24−``using``
25− This is a simple ``Query`` that forms the ``USING`` clause of the ``DELETE``
26− statement. This can be used to join against other tables, and the results
27− can be referenced in the ``deleteWhere`` parameter. For simple ``DELETE``\s
28− where you don't need to do this, you can set ``using = pure ()``.
29−
30−``deleteWhere``
31− The ``WHERE`` clause of the ``DELETE`` statement. This is a function that
32− takes two inputs: the result of the ``using`` query, and the current value
33− of the row.
34−
35−``returning``
36− What to return - see :ref:`returning`.
37−
38−``UPDATE``
39−----------
40−
41−To perform a ``UPDATE`` statement, construct a ``Update`` value and execute it
42−using ``update``. ``Update`` takes:
43−
44−``target``
45− The ``TableSchema`` for the table to update rows in.
46−
47−``from``
48− This is a simple ``Query`` that forms the ``FROM`` clause of the ``UPDATE``
49− statement. This can be used to join against other tables, and the results
50− can be referenced in the ``set`` and ``updateWhere`` parameters. For simple
51− ``UPDATE``\s where you don't need to do this, you can set ``from = pure ()``.
52−
53−``set``
54− A row to row transformation function, indicating how to update selected rows.
55− This function takes rows of the same shape as ``target`` but in the ``Expr``
56− context. One way to write this function is to use record update syntax::
57−
58− set = \from row -> row { rowName = "new name" }
59−
60−``updateWhere``
61− The ``WHERE`` clause of the ``UPDATE`` statement. This is a function that
62− takes two inputs: the result of the ``from`` query, and the current value of
63− the row.
64−
65−``returning``
66− What to return - see :ref:`returning`.
67−
68−``INSERT``
69−----------
70−
71−To perform a ``INSERT`` statement, construct a ``Insert`` value and execute it
72−using ``insert``. ``Insert`` takes:
73−
74−``into``
75− The ``TableSchema`` for the table to insert rows into.
76−
77−``rows``
78− The rows to insert. These are the same as ``into``, but in the ``Expr``
79− context. You can construct rows from their individual fields::
80−
81− rows = values [ MyTable { myTableA = lit "A", myTableB = lit 42 }
82−
83− or you can use ``lit`` on a table value in the ``Result`` context::
84−
85− rows = values [ lit MyTable { myTableA = "A", myTableB = 42 }
86−
87−``onConflict``
88− What should happen if an insert clashes with rows that already exist. This
89− corresponds to PostgreSQL's ``ON CONFLICT`` clause. You can specify:
90−
91− ``Abort``
92− PostgreSQL should abort the ``INSERT`` with an exception
93−
94− ``DoNothing``
95− PostgreSQL should not insert the duplicate rows.
96−
97− ``DoUpdate``
98− PostgreSQL should instead try to update any existing rows that conflict
99− with rows proposed for insertion.
100−
101−``returning``
102− What to return - see :ref:`returning`.
103−
104−.. _returning:
105−
106−``RETURNING``
107−-------------
108−
109−PostgreSQL has the ability to return extra information after a ``DELETE``,
110−``INSERT`` or ``UPDATE`` statement by attaching a ``RETURNING`` clause. A common
111−use of this clause is to return any automatically generated sequence values for
112−primary key columns. Rel8 supports ``RETURNING`` clauses by filling in the
113−``returning`` field and specifying a ``Projection``. A ``Projection`` is a row
114−to row transformation, allowing you to project out a subset of fields.
115−
116−For example, if we are inserting orders, we might want the order ids returned::
117−
118− insert Insert
119− { into = orderSchema
120− , rows = values [ order ]
121− , onConflict = Abort
122− , returning = Projection orderId
123− }
124−
125−If we don't want to return anything, we can use ``pure ()``::
126−
127− insert Insert
128− { into = orderSchema
129− , rows = values [ order ]
130− , onConflict = Abort
131− , returning = pure ()
132− }
133−
134−Default values
135−--------------
136−
137−It is fairly common to define tables with default values. While Rel8 does not
138−have specific functionality for ``DEFAULT``, there are a few options:
139−
140−``unsafeDefault``
141−~~~~~~~~~~~~~~~~~~~~~~~~~~~
142−
143−Rel8 does not have any special support for ``DEFAULT``. If you need to use
144−default column values in inserts, you can use ``unsafeDefault`` to
145−construct the ``DEFAULT`` expression::
146−
147− insert Insert
148− { into = orderSchema
149− , rows = values [ Order { orderId = unsafeDefault, ... } ]
150− , onConflict = Abort
151− , returning = Projection orderId
152− }
153−
154−.. warning::
155− As the name suggests, this is an unsafe operation. In particular, Rel8 is not
156− able to prove that this column does have a default value, so it may be
157− possible to introduce a runtime error. Furthermore, ``DEFAULT`` is fairly
158− special in SQL, and cannot be combined like other expressions. For example,
159− the innocuous expression::
160−
161− unsafeDefault + 1
162−
163− will lead to a runtime crash.
164−
165−Reimplement default values in Rel8
166−~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
167−
168−If you only need to access default values in Rel8, another option is to specify
169−them in Rel8, rather than in your database schema.
170−
171−.. hint::
172− A common default value for primary keys is to use `nextval` to obtain the
173− next value from a sequence. This can be done in Rel8 by using the ``nextval``
174− function::
175−
176− insert Insert
177− { into = orderSchema
178− , rows = values [ Order { orderId = nextval "order_id_seq", ... } ]
179− , onConflict = Abort
180− , returning = Projection orderId
181− }
docs/concepts/queries.rstdeleted−274
@@ -1,274 +0,0 @@
1−Writing queries with ``Query``
2−==============================
3−
4−To fetch data from a database, Rel8 allows you to write ``SELECT`` queries using
5−the ``Query`` monad. While this monad might look a little different from
6−ordinary SQL, it is equal in expressivity, but due to Haskell's ``do`` notation
7−we get to benefit from all the means of abstraction available.
8−
9−Understanding the ``Query`` monad
10−---------------------------------
11−
12−Before we look at special functions for working with ``Query``, we'll first take
13−a moment to understand how the ``Query`` monad works. First, what does the type
14−``Query a`` *mean*? To be a ``Query a`` means to be a SQL ``SELECT`` query that
15−selects rows of type ``a``. Usually ``a`` will be an instance of ``Table Expr``,
16−such as ``Expr Text``, or maybe ``BlogPostComment Expr``.
17−
18−As ``Query`` is an instance of ``Monad`` means that we already have three
19−familiar APIs to work with: ``Functor``, ``Applicative``, and ``Monad``.
20−
21−``Functor Query``
22−^^^^^^^^^^^^^^^^^
23−
24−The ``Functor`` instance gives us access to ``fmap``, and its type is::
25−
26− fmap :: (a -> b) -> Query a -> Query b
27−
28−``fmap`` uniformly transforms rows of one type into rows of another type. In
29−SQL, this is corresponds to a *projection*. For example, if we have a ``Query
30−(User Expr)``, we might do ``fmap userId`` to transform this into a ``Query
31−(Expr UserId)``.
32−
33−``Applicative Query``
34−^^^^^^^^^^^^^^^^^^^^^
35−
36−The ``Applicative`` instance for ``Query`` gives us::
37−
38− pure :: a -> Query a
39− (<*>) :: Query (a -> b) -> Query a -> Query b
40−
41−``pure`` constructs a ``Query`` that returns exactly one row - a row containing
42−the ``a`` that was given. This might seem fairly pointless, but it's an
43−important ``Query`` when compared with ``(<*>)``. The ``<*>`` combines two
44−``Query``\s by taking their *cartesian product*, followed by a projection that
45−combines each row into a new row.
46−
47−One example of using the ``Applicative`` operators is to combine two ``Query``\s
48−into a tuple::
49−
50− pure (,) <*> queryA <*> queryB
51−
52−``Monad Query``
53−^^^^^^^^^^^^^^^
54−
55−The final type class to discuss is ``Monad Query``. ``Monad Query`` has two
56−methods::
57−
58− return :: a -> Query a
59− (>>=) :: Query a -> (a -> Query b) -> Query b
60−
61−``return`` is the same ``pure``, so we won't discuss this further. The much more
62−interesting operation is ``>>=`` - commonly referred to as "bind". This operator
63−allows you to *extend* a ``Query`` with a new query. In SQL this is also similar
64−to a cartesian product, but uses the ``LATERAL`` modifier to allow the second
65−query to refer to columns from the first.
66−
67−This extension operator allows you to expand each row in the first query into
68−zero, one, or many rows, according to the given function. For example, if we
69−have a database of orders, we might write::
70−
71− getAllOrders >>= \order -> getUserById (orderUserId order)
72−
73−This ``Query`` will return, for each ``Order``, the ``User`` who placed that
74−order. In this case, this is a one-to-one relationship, so we get back exactly
75−as many rows as there are orders.
76−
77−Going in the other direction, we have::
78−
79− getAllUsers >>= \user -> getOrdersForUser (userId user)
80−
81−This is a different query, as we start by fetching all ``User``\s, and for each
82−user find all ``Order``\s they have placed. This ``Query`` has a different
83−cardinality, as we're following a one-to-many relationship: any ``User`` may
84−have zero, one, or many orders.
85−
86−Haskell has special syntax for working with monads - ``do`` notation. ``do``
87−notation allows you to write these queries in a simpler form, where we don't
88−have to introduce functions. Expanding on the latter query, we could write::
89−
90− do user <- getAllUsers
91− order <- getOrdersForUser user
92− return (user, order)
93−
94−Now we have a query that, for each ``User``, fetches all orders for that user.
95−The final ``return`` means that for each ``User`` and ``Order``, we'll return a
96−single row.
97−
98−Selecting rows from tables
99−--------------------------
100−
101−With the more theoretical side of ``Query`` considered, we can start looking at
102−the more pragmatic side, and how ``Query`` can express some common SQL idioms.
103−
104−First, one of the most common operations is to select all rows from a *base
105−table*. In SQL, this is a ``SELECT * FROM x`` query, and in Rel8 we use ``each``
106−with a ``TableSchema``.
107−
108−Limit and offset
109−----------------
110−
111−The SQL ``LIMIT`` and ``OFFSET`` keywords are available in Rel8 as ``limit``
112−and ``offset``. Note that, like SQL, the order of these operations matters.
113−Usually, the correct thing to do is to first apply an offset with ``offset``,
114−and then use ``limit`` to limit the number of rows returned::
115−
116− limit n . offset m . orderBy anOrdering
117−
118−These operations are similar to Haskell's ``take`` and ``drop`` operations.
119−
120−Filtering queries
121−-----------------
122−
123−Rel8 offers a few different ways to filter the rows selected by a query.
124−Perhaps the most familiar operation is to apply a ``WHERE`` clause to a query.
125−In Rel8, this is done using ``where_``, which takes any ``Expr Bool``, and
126−returns rows where that ``Expr`` is true. For example, to select all public
127−blog posts, we could write::
128−
129− blogPost <- each blogPostSchema
130− where_ $ blogPostIsPublic blogPost
131−
132−An alternative way to write ``WHERE`` clauses is to use ``filter``. This
133−operator is similar to the ``guard`` function in ``Control.Monad``, but also
134−returns the tested row. This allows us to easily chain a filtering operation on
135−a query. The above query could thus be written as::
136−
137− blogPost <- filter blogPostIsPublic =<< each blogPostSchema
138−
139−``where_`` and ``filter`` allow you to filter rows based on an expression, but
140−sometimes we want to filter based on another query. For this, Rel8 offers
141−``present`` and ``absent``. For example, if all blog posts have a
142−list of tags, we could use ``present`` to find all blog posts that have been
143−tagged as "Haskell"::
144−
145− blogPost <- each blogPostSchema
146− present do
147− filter (("Haskell" ==.) . tagName) =<< tagFromBlogPost blogPost
148−
149−Notice that this example uses ``present`` with a query that itself uses
150−``filter``. For each blog post, ``present`` causes that row to be selected
151−only if the associated query finds a tag for that blog post with the ``tagName``
152−"Haskell".
153−
154−Like ``filter`` there is also a chaining variant of ``present`` - ``with``.
155−We could rewrite the above query using ``with`` as::
156−
157− haskellBlogPost <-
158− each blogPostSchema >>=
159− with (filter (("Haskell" ==.) . tagName) <=< tagFromBlogPost)
160−
161−Inner joins
162−-----------
163−
164−Inner joins are SQL queries of the form ``SELECT .. FROM x JOIN y ON ..``. Rel8
165−doesn't offer a special function for these queries, as the same query can be
166−expressed by selecting from two tables (this is called taking the *cartesian
167−product* of two queries) and then filtering the result.
168−
169−If we wanted to join each blog post with the author of the blog post, we would
170−write the SQL::
171−
172− SELECT * FROM blog_post JOIN author ON author.id = blog_post.id
173−
174−The alternative way to write this query with ``WHERE`` is::
175−
176− SELECT * FROM blog_post, author WHERE author.id = blog_post.id
177−
178−and this query can be written in Rel8 as::
179−
180− blogPost <- each blogPostSchema
181− author <- each authorSchema
182− where_ $ blogPostAuthorId blogPost ==. authorId author
183−
184−.. hint::
185−
186− A good pattern to adopt is to abstract out these joins as functions. A
187− suggested way to write the above would be to extract out an "author for blog
188− post" function::
189−
190− blogPost <- each blogPostSchema
191− author <- authorForBlogPost blogPost
192−
193− where::
194−
195− authorForBlogPost :: BlogPost Expr -> Query (Author Expr)
196− authorForBlogPost blogPost =
197− filter ((blogPostAuthorId blogPost ==.) . authorId) =<<
198− each authorSchema
199−
200− While this is a little more code over all, in our experience this style
201− dramatically increases the readability of queries using joins.
202−
203−Left (outer) joins with ``optional``
204−------------------------------------
205−
206−A left join is like an inner join, but allows for the possibility of the join to
207−"fail". You use left joins when you want to join optional information against a
208−row.
209−
210−In Rel8, a ``LEFT JOIN`` is introduced by converting an inner join with
211−``optional``. While this approach might seem a little foreign at first, it has a
212−strong similarity with the ``Control.Applicative.optional`` function, and allows
213−you to reuse previous code.
214−
215−To see an example of this, let's assume that we want to get the latest comment
216−for each blog post. Not all blog posts are popular though, so some blog posts
217−might have no comment at all. To write this in Rel8, we could write::
218−
219− blogPost <- each blogPostSchema
220−
221− latestComment <-
222− optional $ limit 1 $
223− orderBy (commentCreatedAt >$< desc) $
224− commentsForBlogPost blogPost
225−
226−``optional`` will transform a ``Query a`` into a ``Query (MaybeTable a)``.
227−``MaybeTable`` is similar to the normal ``Maybe`` data type in Haskell, and
228−represents the choice between a ``justTable x`` and a ``nothingTable`` (like
229−``Just x`` and ``Nothing``, respectively). When you execute a query containing
230−``MaybeTable x`` with ``select``, Rel8 will return ``Maybe x``. ``MaybeTable``
231−comes with a library of routines, similar to the functions that can be used to
232−operate on ``Maybe``. For more details, see the API documentation.
233−
234−.. hint::
235−
236− ``optional`` converts an inner join into a ``LEFT JOIN``, but you can also go
237− the other way - and turn a ``LEFT JOIN`` back into an inner join! To do this,
238− you can use ``catMaybeTable``, which will select only the rows when the left
239− join was successful.
240−
241−Ordering results
242−----------------
243−
244−Rel8 supports ordering the results returned by a ``Query``, using SQL's ``ORDER
245−BY`` syntax. To specify an ordering, you use ``orderBy`` and supply an
246−appropriate ``Order`` value.
247−
248−An ``Order`` is built by combining the order of individual columns, each of
249−which can be either ascending or descending. To order a single column, you
250−combine ``asc`` or ``desc`` with ``Order``\s *contravariant* interface. For
251−example, if we have a table with a ``orderId`` column, we can order a ``Query
252−(Order Expr)`` by ``orderId`` with::
253−
254− orderBy (orderId >$< asc)
255−
256−To order by multiple columns, combine the individual orders with ``Order``\s
257−``Monoid`` instance. We could extend the above example to order by the order
258−date first (with the most recent orders first) with::
259−
260− orderBy (mconcat [orderDate >$< desc, orderId >$< asc])
261−
262−Aggregating queries
263−-------------------
264−
265−.. todo::
266−
267− Write this
268−
269−Set operations
270−--------------
271−
272−.. todo::
273−
274− Write this
docs/concepts/tables.rstdeleted−60
@@ -1,60 +0,0 @@
1−Tables
2−======
3−
4−So far we've seen that ``DBType`` bridges Haskell types to database types, and
5−``Expr`` lets us write SQL expressions using these types. The next concept is to
6−understand how tables are mapped into Rel8.
7−
8−In Rel8, we understand a table to be a list of columns. Each column has some
9−associated metadata - a column has a type, but it also has information as to
10−whether it can store ``null``, the name of the column, and whether this column
11−has a default value. All of this metadata can be configured when you define
12−custom table types, but first we'll look at some built in tables.
13−
14−``Expr`` is a single-column table
15−---------------------------------
16−
17−Any time you have an ``Expr``, you also have a table. All ``Expr``\s are tables
18−that consist of exactly one column. This means that whenever a table is
19−expected, you can usually use an ``Expr`` as well.
20−
21−Tuples combine tables
22−---------------------
23−
24−You can use Haskell's normal tuple syntax to combine tables into larger tables.
25−Now that we know that an ``Expr`` is a table with one column, we can use tuples
26−to build larger tables. For example, if we have ``userId :: Expr UserId`` and a
27−``name :: Expr Text``, we can pair these together as ``(userId, name) :: (Expr
28−UserId, Expr Text)``.
29−
30−Rel8 supports tuples with two, three, four and five elements. Beyond that, we
31−suggest writing a custom table type (though you can also nest tuples).
32−
33−Custom table types
34−------------------
35−
36−The primary way to define a table in Rel8 is to use the higher-kinded data
37−pattern. Rel8 advocates this system because it means you can define your data
38−type once, but use it in the context of Haskell expressions (for example, to
39−serialize it as JSON to use as a REST API call response type), and also within
40−Rel8 queries. This allows developers to share their understanding of a type in
41−multiple domains, while also reducing the amount of code that has to be written
42−and maintained.
43−
44−To define a custom table using this pattern, you define a Haskell data type that
45−has a single parameter (conventionally called ``f``). Next, we suggest using
46−record syntax to define the fields of your data type, and for each field use the
47−``Column`` type family to define the type of the column. Once all fields have
48−been defined, you can bridge this type with Rel8 by deriving ``Generic`` and
49−``Rel8able`` instance.
50−
51−A typical table definition might look like this::
52−
53− data User f = User
54− { userId :: Column f UserId
55− , userName :: Column f Text
56− , userCreatedAt :: Column f UTCTime
57− , userEmail :: Column f (Maybe EmailAddress)
58− }
59− deriving stock (Generic)
60− deriving anyclass (Rel8able)
docs/conf.pydeleted−36
@@ -1,36 +0,0 @@
1−import sys
2−import os
3−import sphinx_rtd_theme
4−
5−# Support for :base-ref:, etc.
6−sys.path.insert(0, os.path.abspath('.'))
7−
8−version = "1.0.0"
9−
10−extensions = ['sphinx.ext.extlinks', 'sphinx.ext.todo', 'sphinx_rtd_theme']
11−
12−templates_path = ['_templates']
13−source_suffix = '.rst'
14−source_encoding = 'utf-8-sig'
15−master_doc = 'index'
16−
17−project = u'Rel8'
18−copyright = u'2021 CircuitHub'
19−release = version
20−
21−highlight_language = 'haskell'
22−primary_domain = 'haskell'
23−
24−exclude_patterns = ['.build', "*.gen.rst"]
25−
26−html_theme = 'sphinx_rtd_theme'
27−html_theme_options = {
28− 'logo_only': True,
29− 'navigation_depth': 5,
30−}
31−html_context = {}
32−
33−# on_rtd is whether we are on readthedocs.org, this line of code grabbed from docs.readthedocs.org
34−on_rtd = os.environ.get('READTHEDOCS', None) == 'True'
35−
36−todo_include_todos = True
docs/cookbook.rstdeleted−169
@@ -1,169 +0,0 @@
1−Cookbook
2−========
3−
4−This cookbook exists to help you easily form Rel8 queries. It's main purpose is
5−to help those familiar with SQL to translate their queries into Rel8
6−``Query``\s.
7−
8−``SELECT * FROM table``
9−-----------------------
10−
11−To select from a table, use ``each``.
12−
13−Inner joins
14−-----------
15−
16−To perform an inner join against two queries, use ``where_`` with a join
17−condition. For example, the following SQL:
18−
19−.. code-block:: sql
20−
21− SELECT * FROM table_a JOIN table_b ON table_a.x = table_b.y
22−
23−can be written as::
24−
25− myQuery = do
26− a <- each tableA
27− b <- each tableB
28− where_ $ tableAX a ==. tableBY b
29−
30−Left (outer) joins
31−------------------
32−
33−A ``LEFT JOIN`` query is performed by using ``optional``.
34−
35−For example, the query:
36−
37−.. code-block:: sql
38−
39− SELECT * FROM table_a LEFT JOIN table_b ON table_a.x = table_b.y
40−
41−can be written as::
42−
43− myQuery = do
44− a <- each tableA
45−
46− maybeB <- optional do
47− b <- each tableB
48− where_ $ tableAX a ==. tableBY b
49−
50− return (a, maybeB)
51−
52−Note that ``maybeB`` here will be a ``MaybeTable``, which is the Rel8
53−``Query``-equivalent of ``Maybe``. This allows you to observe if a left join
54−has succeeded or failed.
55−
56−Ordering results
57−----------------
58−
59−A ``Query`` by default has no ordering - just like in SQL. If you rows back in
60−a certain order, you can use ``orderBy`` with an ``Order``.
61−
62−For example, the query:
63−
64−.. code-block:: sql
65−
66− SELECT * FROM my_table ORDER BY my_table.id ASC, my_table.x DESC NULLS FIRST
67−
68−can be written as::
69−
70− myQuery =
71− orderBy (mconcat [ myTableId >$< asc, myTableX >$< nullsFirst desc ]) $
72− each myTableSchema
73−
74−Note that we use ``>$<`` (from ``Data.Functor.Contravariant``) to select table
75−columns, and we can use ``mconcat`` to combine orderings.
76−
77−If all columns of a table have an ordering, you can also use ``ascTable`` and
78−``descTable``. For example::
79−
80− myQuery = orderBy ascTable $ each myTableSchema
81−
82−Aggregations
83−------------
84−
85−Aggregations in Rel8 work by using ``aggregate``, which takes a ``Query
86−(Aggregate a)`` and gives you back a ``Query a``.
87−
88−The following query:
89−
90−.. code-block:: sql
91−
92− SELECT sum(foo), count(distinct bar) FROM table_a
93−
94−can be written as::
95−
96− myQuery = aggregate do
97− a <- each tableA
98− return $ liftF2 (,) (sum (foo a)) (countDistinct (bar a))
99−
100−where ``liftF2`` comes from ``Data.Functor.Apply`` from the ``semigroupoids``
101−library.
102−
103−Combining aggregations
104−----------------------
105−
106−As ``Aggregate`` is an instance of ``Apply`` (which is very similar to
107−``Applicative``), individual aggregations can be combined. For example, one way
108−to take the average rating would be to write the query:
109−
110−.. code-block:: sql
111−
112− SELECT sum(rating.score) / count(rating.score) FROM rating
113−
114−In Rel8, we can write this as::
115−
116− myQuery = aggregate do
117− rating <- each ratingSchema
118− return $ liftF2 (/) (sum (score rating)) (count (score rating))
119−
120−You can also use ``RebindableSyntax`` and ``ApplicativeDo``::
121−
122− {-# language ApplicativeDo, RebindableSyntax #-}
123−
124− import Data.Functor.Apply ((<.>))
125−
126− myQuery = aggregate do
127− rating <- each ratingSchema
128− return do
129− scoreSum <- sum (score rating)
130− numberOfRatings <- count (score rating)
131− return (scoreSum / numberOfRatings)
132− where (<*>) = (<.>)
133−
134−For large aggregations, this can often make queries easier to read.
135−
136−Tree-like queries
137−-----------------
138−
139−Rel8 has a fairly unique feature in that it's able to return not just lists of
140−rows, but can also return *tree*\s.
141−
142−To understand what this means, we'll consider a small example query for blog
143−posts. We want our query to return:
144−
145−1. The latest 5 blog posts that have at least one tag each.
146−2. For each blog post, all tags.
147−3. For each blog post, the latest 3 comments if they exist.
148−
149−In Rel8, we can write this query as::
150−
151− latestBlogPosts = do
152− post <- each postSchema
153−
154− -- Returns a `NonEmptyTable a` which ends up as a `Data.List.NonEmpty a` after the query is run
155− tags <- some $ do
156− tag <- each tagSchema
157− where_ (tagPostId tag ==. postId post)
158− return (tagName tag)
159−
160− -- Returns a `ListTable a` which ends up as a `[a]` after the query is run
161− latestComments <-
162− many $
163− limit 3 $
164− orderBy (commentCreatedAt >$< desc) do
165− comment <- each commentSchema
166− where_ (commentPostId comment ==. postId post)
167−
168− return (post, tags, latestComments)
169−
docs/index.rstdeleted−53
@@ -1,53 +0,0 @@
1−Welcome to Rel8!
2−================
3−
4−Welcome to Rel8! Rel8 is a Haskell library for interacting with PostgreSQL
5−databases, built on top of the fantastic `Opaleye
6−<https://hackage.haskell.org/package/opaleye>`_ library.
7−
8−The main objectives of Rel8 are:
9−
10−* *Conciseness*: Users using Rel8 should not need to write boiler-plate code.
11− By using expressive types, we can provide sufficient information for the
12− compiler to infer code whenever possible.
13−
14−* *Inferrable*: Despite using a lot of type level magic, Rel8 aims to have
15− excellent and predictable type inference.
16−
17−* *Familiar*: writing Rel8 queries should feel like normal Haskell programming.
18−
19−.. toctree::
20− :caption: Getting Started
21− :maxdepth: 2
22−
23− tutorial
24−
25−.. toctree::
26− :caption: Rel8 concepts
27− :maxdepth: 2
28−
29− concepts/dbtype
30− concepts/expr
31− concepts/tables
32− concepts/queries
33− concepts/insert
34−
35−.. toctree::
36− :caption: Tips and tricks
37− :maxdepth: 1
38−
39− cookbook
40−
41−
42−More Resources
43−==============
44−
45−* The `Haskell API documentation <https://hackage.haskell.org/package/rel8>`_
46− describes how individual functions are types are to be used.
47−
48−* If you have a question about how to use Rel8, feel free to open a `GitHub
49− discussion <https://github.com/circuithub/rel8/discussions>`_.
50−
51−* If you think you've found a bug, confusing behavior, or have a feature
52− request, please raise an issue at `Rel8's issue tracker
53− <https://github.com/circuithub/rel8>`_.
docs/requirements.txtdeleted−4
@@ -1,4 +0,0 @@
1−docutils == 0.16.*
2−sphinx == 3.5.*
3−sphinx_rtd_theme
4−
docs/tutorial.rstdeleted−387
@@ -1,387 +0,0 @@
1−.. highlight:: haskell
2−
3−Getting Started
4−===============
5−
6−In this section, we'll take a look at using Rel8 to work with a small database
7−for Haskell packages. We'll take a look at idiomatic usage of Rel8, mapping
8−tables to Haskell, and then look at writing some simple queries.
9−
10−Before we get started, we'll be using the following language extensions and
11−imports throughout this guide::
12−
13− {-# language BlockArguments #-}
14− {-# language DeriveAnyClass #-}
15− {-# language DeriveGeneric #-}
16− {-# language DerivingStrategies #-}
17− {-# language DerivingVia #-}
18− {-# language DuplicateRecordFields #-}
19− {-# language GeneralizedNewtypeDeriving #-}
20− {-# language OverloadedStrings #-}
21− {-# language StandaloneDeriving #-}
22− {-# language TypeApplications #-}
23− {-# language TypeFamilies #-}
24−
25− import Prelude
26− import Rel8
27−
28−The Example Schema
29−------------------
30−
31−Before we start writing any Haskell, let's take a look at the schema we'll work
32−with. The `author` table has three columns:
33−
34−+-----------------+-------------+----------+
35−| Column Name | Type | Nullable |
36−+=================+=============+==========+
37−| ``author_id`` | ``integer`` | not null |
38−+-----------------+-------------+----------+
39−| ``name`` | ``text`` | not null |
40−+-----------------+-------------+----------+
41−| ``url`` | ``text`` | |
42−+-----------------+-------------+----------+
43−
44−and the `project` table has two:
45−
46−+-----------------+-------------+----------+
47−| Column Name | Type | Nullable |
48−+=================+=============+==========+
49−| ``author_id`` | ``integer`` | not null |
50−+-----------------+-------------+----------+
51−| ``name`` | ``text`` | not null |
52−+-----------------+-------------+----------+
53−
54−A ``project`` always has an ``author``, but not all ``author``\s have projects.
55−Each ``author`` has a name and (maybe) an associated website, and each project
56−has a name.
57−
58−Mapping Schemas to Haskell
59−--------------------------
60−
61−Now that we've seen our schema, we can begin writing a mapping in Rel8. The
62−idiomatic way to map a table is to use a record that is parameterised what Rel8
63−calls an *interpretation functor*, and to define each field with ``Column``.
64−For this type to be usable with Rel8 we need it to be an instance of
65−``Rel8able``, which can be derived with a combination of ``DeriveAnyClass`` and
66−``DeriveGeneric`` language extensions.
67−
68−Following these steps for ``author``, we have::
69−
70− data Author f = Author
71− { authorId :: Column f Int64
72− , name :: Column f Text
73− , url :: Column f (Maybe Text)
74− }
75− deriving stock (Generic)
76− deriving anyclass (Rel8able)
77−
78−This is a perfectly reasonable definition, but cautious readers might notice a
79−problem - in particular, with the type of the ``authorId`` field. While
80−``Int64`` is correct, it's not the best type. If we had other identifier types
81−in our project, it would be too easy to accidentally mix them up and create
82−nonsensical joins. As Haskell programmers, we often solve this problem by
83−creating ``newtype`` wrappers, and we can also use this technique with Rel8::
84−
85− newtype AuthorId = AuthorId { toInt64 :: Int64 }
86− deriving newtype (DBEq, DBType, Eq, Show)
87−
88−Now we can write our final schema mapping. First, the ``author`` table::
89−
90− data Author f = Author
91− { authorId :: Column f AuthorId
92− , authorName :: Column f Text
93− , authorUrl :: Column f (Maybe Text)
94− }
95− deriving stock (Generic)
96− deriving anyclass (Rel8able)
97−
98−And similarly, the ``project`` table::
99−
100− data Project f = Project
101− { projectAuthorId :: Column f AuthorId
102− , projectName :: Column f Text
103− }
104− deriving stock (Generic)
105− deriving anyclass (Rel8able)
106−
107−To show query results in this documentation, we'll also need ``Show`` instances:
108−Unfortunately these definitions look a bit scary, but they are essentially just
109−``deriving (Show)``::
110−
111− deriving stock instance f ~ Result => Show (Author f)
112− deriving stock instance f ~ Result => Show (Project f)
113−
114−These data types describe the structural mapping of the tables, but we also
115−need to specify a ``TableSchema`` for each table. A ``TableSchema`` contains
116−the name of the table and the name of all columns in the table, which will
117−ultimately allow us to ``SELECT`` and ``INSERT`` rows for these tables.
118−
119−To define a ``TableSchema``, we just need to fill construct appropriate
120−``TableSchema`` values. When it comes to the ``tableColumns`` field, we
121−construct values of our data types above, and set each field to the name of the
122−column that it maps to.
123−
124−First, ``authorSchema`` describes the column names of the ``author`` table when
125−associated with the ``Author`` type::
126−
127− authorSchema :: TableSchema (Author Name)
128− authorSchema = TableSchema
129− { name = "author"
130− , schema = Nothing
131− , columns = Author
132− { authorId = "author_id"
133− , authorName = "name"
134− , authorUrl = "url"
135− }
136− }
137−
138−And likewise for ``project`` and ``Project``::
139−
140− projectSchema :: TableSchema (Project Name)
141− projectSchema = TableSchema
142− { name = "project"
143− , schema = Nothing
144− , columns = Project
145− { projectAuthorId = "author_id"
146− , projectName = "name"
147− }
148− }
149−
150−There is also some generics machinery available if you want to grab the field
151−information from your ``Rel8able`` type::
152−
153− projectSchema :: TableSchema (Project Name)
154− projectSchema = TableSchema
155− { name = "project"
156− , schema = Nothing
157− , columns = namesFromLabels @(Project Name)
158− }
159−
160−This will create a ``TableSchema`` for ``Project`` where every column name
161−corresponds exactly to the name of the field. If you need more flexibility, you
162−can use ``namesFromLabelsWith``, which takes a transformation function.
163−
164−.. note::
165−
166− You might be wondering why this information isn't in the definitions of
167− ``Author`` and ``Project`` above. Rel8 decouples ``TableSchema`` from the data
168− types themselves, as not all tables you define will necessarily have a schema.
169− For example, Rel8 allows you to define helper types to simplify the types of
170− queries - these tables only exist at query time, but there is no corresponding
171− base table. We'll see more on this idea later!
172−
173−With these table definitions, we can now start writing some queries!
174−
175−Writing Queries
176−---------------
177−
178−Simple Queries
179−~~~~~~~~~~~~~~
180−
181−First, we'll take a look at ``SELECT`` statements - usually the bulk of most
182−database heavy applications.
183−
184−In Rel8, ``SELECT`` statements are built using the ``Query`` monad. You can
185−think of this monad like the ordinary ``[]`` (List) monad - but this isn't
186−required knowledge.
187−
188−To start, we'll look at one of the simplest queries possible - a basic ``SELECT
189−* FROM`` statement. To select all rows from a table, we use ``each``, and
190−supply a ``TableSchema``. So to select all ``project`` rows, we can write::
191−
192− >>> :t each projectSchema
193− each projectSchema :: Query (Project Expr)
194−
195−Notice that ``each`` gives us a ``Query`` that yields ``Project Expr`` rows. To
196−see what this means, let's have a look at a single field of a ``Project Expr``::
197−
198− >>> let aProjectExpr = undefined :: Project Expr
199− >>> :t projectAuthorId aProjectExpr
200− projectAuthorId aProjectExpr :: Expr AuthorId
201−
202−Recall we defined ``projectAuthorId`` as ``Column f AuthorId``. Now we have
203−``f`` is ``Expr``, and ``Column Expr AuthorId`` reduces to ``Expr AuthorId``.
204−We'll see more about ``Expr`` soon, but you can think of ``Expr a`` as "SQL
205−expressions of type ``a``\".
206−
207−To execute this ``Query``, we pass it to ``select``. This function takes both a
208−database connection (which can be obtained using hasql's ``acquire`` function),
209−and the ``Query`` to run::
210−
211− >>> Right conn <- acquire "user=postgres"
212− >>> :t select conn (each projectSchema)
213− select conn (each projectSchema) :: MonadIO m => m [Project Result]
214−
215−When we ``select`` things containing ``Expr``\s, Rel8 builds a new response
216−table with the ``Result`` interpretation. This means you'll get back plain
217−Haskell values. Studying ``projectAuthorId`` again, we have::
218−
219− >>> let aProjectResult = undefined :: Project Result
220− >>> :t projectAuthorId aProjectResult
221− projectAuthorId aProjectResult :: AuthorId
222−
223−Here ``Column Result AuthorId`` reduces to just ``AuthorId``, with no
224−wrappping type at all.
225−
226−Putting this all together, we can run our first query::
227−
228− >>> select conn (each projectSchema) >>= mapM_ print
229− Project {projectAuthorId = 1, projectName = "rel8"}
230− Project {projectAuthorId = 2, projectName = "aeson"}
231− Project {projectAuthorId = 2, projectName = "text"}
232−
233−We now know that ``each`` is the equivalent of a ``SELECT *`` query, but
234−sometimes we're only interested in a subset of the columns of a table. To
235−restrict the returned columns, we can specify a projection by using ``Query``\s
236−``Functor`` instance::
237−
238− >>> select conn $ projectName <$> each projectSchema
239− ["rel8","aeson","text"]
240−
241−Joins
242−~~~~~
243−
244−Another common operation in relational databases is to take the ``JOIN`` of
245−multiple tables. Rel8 doesn't have a specific join operation, but we can
246−recover the functionality of a join by selecting all rows of two tables, and
247−then using ``where_`` to filter them.
248−
249−To see how this works, first let's look at taking the product of two tables.
250−We can do this by simply calling ``each`` twice, and then returning a tuple of
251−their results::
252−
253− >>> :{
254− mapM_ print =<< select conn do
255− author <- each authorSchema
256− project <- each projectSchema
257− return (projectName project, authorName author)
258− :}
259− ("rel8","Ollie")
260− ("rel8","Bryan O'Sullivan")
261− ("rel8","Emily Pillmore")
262− ("aeson","Ollie")
263− ("aeson","Bryan O'Sullivan")
264− ("aeson","Emily Pillmore")
265− ("text","Ollie")
266− ("text","Bryan O'Sullivan")
267− ("text","Emily Pillmore")
268−
269−This isn't quite right, though, as we have ended up pairing up the wrong
270−projects and authors. To fix this, we can use ``where_`` to restrict the
271−returned rows. We could write::
272−
273− select conn $ do
274− author <- each authorSchema
275− project <- each projectSchema
276− where_ $ projectAuthorId project ==. authorId author
277− return (project, author)
278−
279−but doing this every time you need a join can obscure the meaning of the
280−query you're writing. A good practice is to introduce specialised functions
281−for the particular joins in your database. In our case, this would be::
282−
283− projectsForAuthor :: Author Expr -> Query (Project Expr)
284− projectsForAuthor a = each projectSchema >>= filter \p ->
285− projectAuthorId p ==. authorId a
286−
287−Our final query is then::
288−
289− >>> :{
290− mapM_ print =<< select conn do
291− author <- each authorSchema
292− project <- projectsForAuthor author
293− return (projectName project, authorName author)
294− :}
295− ("rel8","Ollie")
296− ("aeson","Bryan O'Sullivan")
297− ("text","Bryan O'Sullivan")
298−
299−Left Joins
300−~~~~~~~~~~
301−
302−Rel8 is also capable of performing ``LEFT JOIN``\s. To perform ``LEFT JOIN``\s,
303−we follow the same approach as before, but use the ``optional`` query
304−transformer to allow for the possibility of the join to fail.
305−
306−In our test database, we can see that there's another author who we haven't
307−seen yet::
308−
309− >>> select conn $ authorName <$> each authorSchema
310− ["Ollie","Bryan O'Sullivan","Emily Pillmore"]
311−
312−Emily wasn't returned in our earlier query because - in our database - she
313−doesn't have any registered projects. We can account for this partiality in our
314−original query by wrapping the ``projectsForAuthor`` call with ``optional``::
315−
316− >>> :{
317− mapM_ print =<< select conn do
318− author <- each authorSchema
319− mproject <- optional $ projectsForAuthor author
320− return (authorName author, projectName <$> mproject)
321− :}
322− ("Ollie",Just "rel8")
323− ("Bryan O'Sullivan",Just "aeson")
324− ("Bryan O'Sullivan",Just "text")
325− ("Emily Pillmore",Nothing)
326−
327−
328−Aggregation
329−~~~~~~~~~~~
330−
331−Aggregations are operations like ``sum`` and ``count`` - operations that reduce
332−multiple rows to single values. To perform aggregations in Rel8, we can use the
333−``aggregate`` function, which takes a ``Query`` of aggregated expressions, runs
334−the aggregation, and returns aggregated rows.
335−
336−To start, let's look at a simple aggregation that tells us how many projects
337−exist:
338−
339−.. todo::
340−
341− >>> error "TODO"
342−
343−Rel8 is also capable of aggregating multiple rows into a single row by
344−concatenating all rows as a list. This aggregation allows us to break free of
345−the row-orientated nature of SQL and write queries that return tree-like
346−structures. Earlier we saw an example of returning authors with their projects,
347−but the query didn't do a great job of describing the one-to-many relationship
348−between authors and their projects.
349−
350−Let's look again at a query that returns authors and their projects, and
351−focus on the /type/ of that query::
352−
353− projectsForAuthor a = each projectSchema >>= filter \p ->
354− projectAuthorId p ==. authorId a
355−
356− let authorsAndProjects = do
357− author <- each authorSchema
358− project <- projectsForAuthor author
359− return (author, project)
360− where
361−
362− >>> :t select conn authorsAndProjects
363− select conn authorsAndProjects
364− :: MonadIO m => m [(Author Result, Project Result)]
365−
366−
367−Our query gives us a single list of pairs of authors and projects. However,
368−with our domain knowledge of the schema, this isn't a great type - what we'd
369−rather have is a list of pairs of authors and /lists/ of projects. That is,
370−what we'd like is::
371−
372− [(Author Result, [Project Result])]
373−
374−This would be a much better type! Rel8 can produce a query with this type by
375−simply wrapping the call to ``projectsForAuthor`` with either ``some`` or
376−``many``. Here we'll use ``many``, which allows for the possibility of an
377−author to have no projects::
378−
379− >>> :{
380− mapM_ print =<< select conn do
381− author <- each authorSchema
382− projectNames <- many $ projectName <$> projectsForAuthor author
383− return (authorName author, projectNames)
384− :}
385− ("Ollie",["rel8"])
386− ("Bryan O'Sullivan",["aeson","text"])
387− ("Emily Pillmore",[])
jobs.nixnew file+5
@@ -0,0 +1,5 @@
1+let rel8 = (import ./.).hsPkgs.rel8;
2+in {
3+ rel8 = rel8.components.library;
4+ tests = rel8.checks.tests;
5+}
nix/sources.json+36−36
@@ -1,38 +1,38 @@
1{
1{
2− "haskell.nix": {
2+ "haskell.nix": {
3− "branch": "master",
3+ "branch": "circuithub",
4− "description": "Alternative Haskell Infrastructure for Nixpkgs",
4+ "description": "Alternative Haskell Infrastructure for Nixpkgs",
5− "homepage": "https://input-output-hk.github.io/haskell.nix",
5+ "homepage": "https://input-output-hk.github.io/haskell.nix",
6− "owner": "input-output-hk",
6+ "owner": "circuithub",
7− "repo": "haskell.nix",
7+ "repo": "haskell.nix",
8− "rev": "0837156c56cb5350dd9bd84eb424187e00aa1e8a",
8+ "rev": "2902f9b49484a87afb0e1a33b1d88a2c7b8ca0a0",
9− "sha256": "1djmv5a0vfj78csw2cad6nicrs8iqrp928b9b3v4h7lwwhhzliwl",
9+ "sha256": "0a01g5b46z5yaf2mnl415hc4lciwiyqhj22qhgwgwd261w4068iy",
10− "type": "tarball",
10+ "type": "tarball",
11− "url": "https://github.com/input-output-hk/haskell.nix/archive/0837156c56cb5350dd9bd84eb424187e00aa1e8a.tar.gz",
11+ "url": "https://github.com/circuithub/haskell.nix/archive/2902f9b49484a87afb0e1a33b1d88a2c7b8ca0a0.tar.gz",
12− "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
12+ "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
13− },
13+ },
14− "niv": {
14+ "niv": {
15− "branch": "master",
15+ "branch": "master",
16− "description": "Easy dependency management for Nix projects",
16+ "description": "Easy dependency management for Nix projects",
17− "homepage": "https://github.com/nmattia/niv",
17+ "homepage": "https://github.com/nmattia/niv",
18− "owner": "nmattia",
18+ "owner": "nmattia",
19− "repo": "niv",
19+ "repo": "niv",
20− "rev": "acdb1726783637852c01e0ad639ac9cbec28d8c8",
20+ "rev": "ba57d5a29b4e0f2085917010380ef3ddc3cf380f",
21− "sha256": "1wszl8q70z6wfgkh2dvgmhhry6qp9nar421qq2ifd17hq2jj9ck3",
21+ "sha256": "1kpsvc53x821cmjg1khvp1nz7906gczq8mp83664cr15h94sh8i4",
22− "type": "tarball",
22+ "type": "tarball",
23− "url": "https://github.com/nmattia/niv/archive/acdb1726783637852c01e0ad639ac9cbec28d8c8.tar.gz",
23+ "url": "https://github.com/nmattia/niv/archive/ba57d5a29b4e0f2085917010380ef3ddc3cf380f.tar.gz",
24− "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
24+ "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
25− },
25+ },
26− "nixpkgs": {
26+ "nixpkgs": {
27− "branch": "nixos-20.09",
27+ "branch": "nixos-20.09",
28− "description": "Nix Packages collection",
28+ "description": "Nix Packages collection",
29− "homepage": null,
29+ "homepage": null,
30− "owner": "nixos",
30+ "owner": "nixos",
31− "repo": "nixpkgs",
31+ "repo": "nixpkgs",
32− "rev": "1c1f5649bb9c1b0d98637c8c365228f57126f361",
32+ "rev": "6e7f25001fe6874f7ae271891f709bbf50a22c45",
33− "sha256": "0f2nvdijyxfgl5kwyb4465pppd5vkhqxddx6v40k2s0z9jfhj0xl",
33+ "sha256": "1x04j4351pqiqbpkq6g308mxcvb5aqnwv8l2vmlxkgvq5phzky7z",
34− "type": "tarball",
34+ "type": "tarball",
35− "url": "https://github.com/nixos/nixpkgs/archive/1c1f5649bb9c1b0d98637c8c365228f57126f361.tar.gz",
35+ "url": "https://github.com/nixos/nixpkgs/archive/6e7f25001fe6874f7ae271891f709bbf50a22c45.tar.gz",
36− "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
36+ "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
37− }
37+ }
38}
38}
nix/sources.nix+20−66
@@ -6,53 +6,25 @@ let
6 # The fetchers. fetch_<type> fetches specs of type <type>.
6 # The fetchers. fetch_<type> fetches specs of type <type>.
7 #
7 #
8
8
9− fetch_file = pkgs: name: spec:
9+ fetch_file = pkgs: spec:
10− let
11− name' = sanitizeName name + "-src";
12− in
13− if spec.builtin or true then
10+ if spec.builtin or true then
14− builtins_fetchurl { inherit (spec) url sha256; name = name'; }
11+ builtins_fetchurl { inherit (spec) url sha256; }
15− else
12+ else
16− pkgs.fetchurl { inherit (spec) url sha256; name = name'; };
13+ pkgs.fetchurl { inherit (spec) url sha256; };
17
14
18 fetch_tarball = pkgs: name: spec:
15 fetch_tarball = pkgs: name: spec:
19 let
16 let
20− name' = sanitizeName name + "-src";
17+ ok = str: ! builtins.isNull (builtins.match "[a-zA-Z0-9+-._?=]" str);
18+ # sanitize the name, though nix will still fail if name starts with period
19+ name' = stringAsChars (x: if ! ok x then "-" else x) "${name}-src";
21 in
20 in
22 if spec.builtin or true then
21 if spec.builtin or true then
23 builtins_fetchTarball { name = name'; inherit (spec) url sha256; }
22 builtins_fetchTarball { name = name'; inherit (spec) url sha256; }
24 else
23 else
25 pkgs.fetchzip { name = name'; inherit (spec) url sha256; };
24 pkgs.fetchzip { name = name'; inherit (spec) url sha256; };
26
25
27− fetch_git = name: spec:
26+ fetch_git = spec:
28− let
29− ref =
30− if spec ? ref then spec.ref else
31− if spec ? branch then "refs/heads/${spec.branch}" else
32− if spec ? tag then "refs/tags/${spec.tag}" else
33− abort "In git source '${name}': Please specify `ref`, `tag` or `branch`!";
34− submodules = if spec ? submodules then spec.submodules else false;
35− submoduleArg =
36− let
37− nixSupportsSubmodules = builtins.compareVersions builtins.nixVersion "2.4" >= 0;
38− emptyArgWithWarning =
39− if submodules == true
40− then
41− builtins.trace
42− (
43− "The niv input \"${name}\" uses submodules "
44− + "but your nix's (${builtins.nixVersion}) builtins.fetchGit "
45− + "does not support them"
46− )
47− {}
48− else {};
49− in
50− if nixSupportsSubmodules
51− then { inherit submodules; }
52− else emptyArgWithWarning;
53− in
54− builtins.fetchGit
55− ({ url = spec.repo; inherit (spec) rev; inherit ref; } // submoduleArg);
27+ builtins.fetchGit { url = spec.repo; inherit (spec) rev ref; };
56
28
57 fetch_local = spec: spec.path;
29 fetch_local = spec: spec.path;
58
30
@@ -68,21 +40,11 @@ let
68 # Various helpers
40 # Various helpers
69 #
41 #
70
42
71− # https://github.com/NixOS/nixpkgs/pull/83241/files#diff-c6f540a4f3bfa4b0e8b6bafd4cd54e8bR695
72− sanitizeName = name:
73− (
74− concatMapStrings (s: if builtins.isList s then "-" else s)
75− (
76− builtins.split "[^[:alnum:]+._?=-]+"
77− ((x: builtins.elemAt (builtins.match "\\.*(.*)" x) 0) name)
78− )
79− );
80−
81 # The set of packages used when specs are fetched using non-builtins.
43 # The set of packages used when specs are fetched using non-builtins.
82− mkPkgs = sources: system:
44+ mkPkgs = sources:
83 let
45 let
84 sourcesNixpkgs =
46 sourcesNixpkgs =
85− import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) { inherit system; };
47+ import (builtins_fetchTarball { inherit (sources.nixpkgs) url sha256; }) {};
86 hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
48 hasNixpkgsPath = builtins.any (x: x.prefix == "nixpkgs") builtins.nixPath;
87 hasThisAsNixpkgsPath = <nixpkgs> == ./.;
49 hasThisAsNixpkgsPath = <nixpkgs> == ./.;
88 in
50 in
@@ -102,9 +64,9 @@ let
102
64
103 if ! builtins.hasAttr "type" spec then
65 if ! builtins.hasAttr "type" spec then
104 abort "ERROR: niv spec ${name} does not have a 'type' attribute"
66 abort "ERROR: niv spec ${name} does not have a 'type' attribute"
105− else if spec.type == "file" then fetch_file pkgs name spec
67+ else if spec.type == "file" then fetch_file pkgs spec
106 else if spec.type == "tarball" then fetch_tarball pkgs name spec
68 else if spec.type == "tarball" then fetch_tarball pkgs name spec
107− else if spec.type == "git" then fetch_git name spec
69+ else if spec.type == "git" then fetch_git spec
108 else if spec.type == "local" then fetch_local spec
70 else if spec.type == "local" then fetch_local spec
109 else if spec.type == "builtin-tarball" then fetch_builtin-tarball name
71 else if spec.type == "builtin-tarball" then fetch_builtin-tarball name
110 else if spec.type == "builtin-url" then fetch_builtin-url name
72 else if spec.type == "builtin-url" then fetch_builtin-url name
@@ -118,10 +80,7 @@ let
118 saneName = stringAsChars (c: if isNull (builtins.match "[a-zA-Z0-9]" c) then "_" else c) name;
80 saneName = stringAsChars (c: if isNull (builtins.match "[a-zA-Z0-9]" c) then "_" else c) name;
119 ersatz = builtins.getEnv "NIV_OVERRIDE_${saneName}";
81 ersatz = builtins.getEnv "NIV_OVERRIDE_${saneName}";
120 in
82 in
121− if ersatz == "" then drv else
83+ if ersatz == "" then drv else ersatz;
122− # this turns the string into an actual Nix path (for both absolute and
123− # relative paths)
124− if builtins.substring 0 1 ersatz == "/" then /. + ersatz else /. + builtins.getEnv "PWD" + "/${ersatz}";
125
84
126 # Ports of functions for older nix versions
85 # Ports of functions for older nix versions
127
86
@@ -139,29 +98,25 @@ let
139
98
140 # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
99 # https://github.com/NixOS/nixpkgs/blob/0258808f5744ca980b9a1f24fe0b1e6f0fecee9c/lib/strings.nix#L269
141 stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
100 stringAsChars = f: s: concatStrings (map f (stringToCharacters s));
142− concatMapStrings = f: list: concatStrings (map f list);
143 concatStrings = builtins.concatStringsSep "";
101 concatStrings = builtins.concatStringsSep "";
144
102
145− # https://github.com/NixOS/nixpkgs/blob/8a9f58a375c401b96da862d969f66429def1d118/lib/attrsets.nix#L331
146− optionalAttrs = cond: as: if cond then as else {};
147−
148 # fetchTarball version that is compatible between all the versions of Nix
103 # fetchTarball version that is compatible between all the versions of Nix
149− builtins_fetchTarball = { url, name ? null, sha256 }@attrs:
104+ builtins_fetchTarball = { url, name, sha256 }@attrs:
150 let
105 let
151 inherit (builtins) lessThan nixVersion fetchTarball;
106 inherit (builtins) lessThan nixVersion fetchTarball;
152 in
107 in
153 if lessThan nixVersion "1.12" then
108 if lessThan nixVersion "1.12" then
154− fetchTarball ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
109+ fetchTarball { inherit name url; }
155 else
110 else
156 fetchTarball attrs;
111 fetchTarball attrs;
157
112
158 # fetchurl version that is compatible between all the versions of Nix
113 # fetchurl version that is compatible between all the versions of Nix
159− builtins_fetchurl = { url, name ? null, sha256 }@attrs:
114+ builtins_fetchurl = { url, sha256 }@attrs:
160 let
115 let
161 inherit (builtins) lessThan nixVersion fetchurl;
116 inherit (builtins) lessThan nixVersion fetchurl;
162 in
117 in
163 if lessThan nixVersion "1.12" then
118 if lessThan nixVersion "1.12" then
164− fetchurl ({ inherit url; } // (optionalAttrs (!isNull name) { inherit name; }))
119+ fetchurl { inherit url; }
165 else
120 else
166 fetchurl attrs;
121 fetchurl attrs;
167
122
@@ -180,8 +135,7 @@ let
180 mkConfig =
135 mkConfig =
181 { sourcesFile ? if builtins.pathExists ./sources.json then ./sources.json else null
136 { sourcesFile ? if builtins.pathExists ./sources.json then ./sources.json else null
182 , sources ? if isNull sourcesFile then {} else builtins.fromJSON (builtins.readFile sourcesFile)
137 , sources ? if isNull sourcesFile then {} else builtins.fromJSON (builtins.readFile sourcesFile)
183− , system ? builtins.currentSystem
184− , pkgs ? mkPkgs sources system
138+ , pkgs ? mkPkgs sources
185 }: rec {
139 }: rec {
186 # The sources, i.e. the attribute set of spec name to spec
140 # The sources, i.e. the attribute set of spec name to spec
187 inherit sources;
141 inherit sources;
rel8.cabal+53−77
@@ -1,36 +1,30 @@
1cabal-version: 2.0
1cabal-version: 2.0
2name: rel8
2name: rel8
3−version: 1.4.0.0
3+version: 0.1.0.0
4synopsis: Hey! Hey! Can u rel8?
4synopsis: Hey! Hey! Can u rel8?
5license: BSD3
5license: BSD3
6license-file: LICENSE
6license-file: LICENSE
7author: Oliver Charles
7author: Oliver Charles
8maintainer: ollie@ocharles.org.uk
8maintainer: ollie@ocharles.org.uk
9−homepage: https://github.com/circuithub/rel8
10−bug-reports: https://github.com/circuithub/rel8/issues
11−build-type: Simple
9+build-type: Custom
12−extra-doc-files:
13− README.md
14− Changelog.md
15
10
16−source-repository head
11+custom-setup
17− type: git
12+ setup-depends:
18− location: https://github.com/circuithub/rel8
13+ base >= 4 && <5,
14+ Cabal,
15+ cabal-doctest >= 1 && <1.1
19
16
20library
17library
21 build-depends:
18 build-depends:
22 aeson
19 aeson
23− , base ^>= 4.14 || ^>=4.15 || ^>=4.16
20+ , base ^>=4.12 || ^>= 4.13 || ^>= 4.14
24− , bifunctors
25 , bytestring
21 , bytestring
26 , case-insensitive
22 , case-insensitive
27− , comonad
23+ , casing
28 , contravariant
24 , contravariant
29− , hasql ^>= 1.4.5.1 || ^>= 1.5.0.0 || ^>= 1.6.0.0
25+ , hasql
30− , opaleye ^>= 0.9.6.1
26+ , opaleye ^>= 0.7.1.0
31− , pretty
32 , profunctors
27 , profunctors
33− , product-profunctors
34 , scientific
28 , scientific
35 , semialign
29 , semialign
36 , semigroupoids
30 , semigroupoids
@@ -41,12 +35,10 @@ library
41 default-language:
35 default-language:
42 Haskell2010
36 Haskell2010
43 ghc-options:
37 ghc-options:
44− -Werror=missing-methods -Werror=incomplete-patterns -Werror=missing-fields
45 -Weverything -Wno-unsafe -Wno-safe -Wno-missing-safe-haskell-mode
38 -Weverything -Wno-unsafe -Wno-safe -Wno-missing-safe-haskell-mode
46 -Wno-missing-import-lists -Wno-prepositive-qualified-module
39 -Wno-missing-import-lists -Wno-prepositive-qualified-module
47 -Wno-monomorphism-restriction
40 -Wno-monomorphism-restriction
48− -Wno-missing-local-signatures
41+ -Wno-missing-local-signatures
49− -Wno-missing-kind-signatures
50 hs-source-dirs:
42 hs-source-dirs:
51 src
43 src
52 exposed-modules:
44 exposed-modules:
@@ -59,45 +51,22 @@ library
59 other-modules:
51 other-modules:
60 Rel8.Aggregate
52 Rel8.Aggregate
61
53
62− Rel8.Column
63− Rel8.Column.ADT
64− Rel8.Column.Either
65− Rel8.Column.Lift
66− Rel8.Column.List
67− Rel8.Column.Maybe
68− Rel8.Column.NonEmpty
69− Rel8.Column.Null
70− Rel8.Column.These
71−
72 Rel8.Expr
54 Rel8.Expr
73 Rel8.Expr.Aggregate
55 Rel8.Expr.Aggregate
74 Rel8.Expr.Array
56 Rel8.Expr.Array
75 Rel8.Expr.Bool
57 Rel8.Expr.Bool
76− Rel8.Expr.Default
77 Rel8.Expr.Eq
58 Rel8.Expr.Eq
78 Rel8.Expr.Function
59 Rel8.Expr.Function
79 Rel8.Expr.Null
60 Rel8.Expr.Null
80 Rel8.Expr.Opaleye
61 Rel8.Expr.Opaleye
81 Rel8.Expr.Ord
62 Rel8.Expr.Ord
82 Rel8.Expr.Order
63 Rel8.Expr.Order
83− Rel8.Expr.Sequence
84 Rel8.Expr.Serialize
64 Rel8.Expr.Serialize
85− Rel8.Expr.Window
86
65
87 Rel8.FCF
66 Rel8.FCF
88
67
89− Rel8.Kind.Algebra
68+ Rel8.Kind.Labels
90− Rel8.Kind.Context
69+ Rel8.Kind.Necessity
91−
92− Rel8.Generic.Construction
93− Rel8.Generic.Construction.ADT
94− Rel8.Generic.Construction.Record
95− Rel8.Generic.Map
96− Rel8.Generic.Record
97− Rel8.Generic.Rel8able
98− Rel8.Generic.Table
99− Rel8.Generic.Table.ADT
100− Rel8.Generic.Table.Record
101
70
102 Rel8.Order
71 Rel8.Order
103
72
@@ -106,26 +75,28 @@ library
106 Rel8.Query.Distinct
75 Rel8.Query.Distinct
107 Rel8.Query.Each
76 Rel8.Query.Each
108 Rel8.Query.Either
77 Rel8.Query.Either
109− Rel8.Query.Evaluate
110 Rel8.Query.Exists
78 Rel8.Query.Exists
111 Rel8.Query.Filter
79 Rel8.Query.Filter
112− Rel8.Query.Indexed
113 Rel8.Query.Limit
80 Rel8.Query.Limit
114 Rel8.Query.List
81 Rel8.Query.List
115 Rel8.Query.Maybe
82 Rel8.Query.Maybe
116 Rel8.Query.Null
83 Rel8.Query.Null
117 Rel8.Query.Opaleye
84 Rel8.Query.Opaleye
118 Rel8.Query.Order
85 Rel8.Query.Order
119− Rel8.Query.Rebind
120 Rel8.Query.Set
86 Rel8.Query.Set
121 Rel8.Query.SQL
87 Rel8.Query.SQL
122 Rel8.Query.These
88 Rel8.Query.These
123 Rel8.Query.Values
89 Rel8.Query.Values
124− Rel8.Query.Window
125
90
91+ Rel8.Schema.Column
92+ Rel8.Schema.Context
93+ Rel8.Schema.Context.Identity
94+ Rel8.Schema.Context.Label
126 Rel8.Schema.Context.Nullify
95 Rel8.Schema.Context.Nullify
127 Rel8.Schema.Dict
96 Rel8.Schema.Dict
128 Rel8.Schema.Field
97 Rel8.Schema.Field
98+ Rel8.Schema.Generic
99+ Rel8.Schema.Generic.Test
129 Rel8.Schema.HTable
100 Rel8.Schema.HTable
130 Rel8.Schema.HTable.Either
101 Rel8.Schema.HTable.Either
131 Rel8.Schema.HTable.Identity
102 Rel8.Schema.HTable.Identity
@@ -135,59 +106,55 @@ library
135 Rel8.Schema.HTable.Maybe
106 Rel8.Schema.HTable.Maybe
136 Rel8.Schema.HTable.NonEmpty
107 Rel8.Schema.HTable.NonEmpty
137 Rel8.Schema.HTable.Nullify
108 Rel8.Schema.HTable.Nullify
138− Rel8.Schema.HTable.Product
109+ Rel8.Schema.HTable.Pair
110+ Rel8.Schema.HTable.Quartet
111+ Rel8.Schema.HTable.Quintet
139 Rel8.Schema.HTable.These
112 Rel8.Schema.HTable.These
113+ Rel8.Schema.HTable.Trio
114+ Rel8.Schema.HTable.Type
140 Rel8.Schema.HTable.Vectorize
115 Rel8.Schema.HTable.Vectorize
116+ Rel8.Schema.Insert
141 Rel8.Schema.Kind
117 Rel8.Schema.Kind
142 Rel8.Schema.Name
118 Rel8.Schema.Name
143− Rel8.Schema.Null
119+ Rel8.Schema.Nullability
144− Rel8.Schema.Result
120+ Rel8.Schema.Nullability.Internal
145 Rel8.Schema.Spec
121 Rel8.Schema.Spec
122+ Rel8.Schema.Spec.ConstrainDBType
123+ Rel8.Schema.Spec.ConstrainType
146 Rel8.Schema.Table
124 Rel8.Schema.Table
147
125
148 Rel8.Statement.Delete
126 Rel8.Statement.Delete
149 Rel8.Statement.Insert
127 Rel8.Statement.Insert
150− Rel8.Statement.OnConflict
151 Rel8.Statement.Returning
128 Rel8.Statement.Returning
152 Rel8.Statement.Select
129 Rel8.Statement.Select
153− Rel8.Statement.Set
154− Rel8.Statement.SQL
155 Rel8.Statement.Update
130 Rel8.Statement.Update
156− Rel8.Statement.Using
157 Rel8.Statement.View
131 Rel8.Statement.View
158− Rel8.Statement.Where
159
132
160 Rel8.Table
133 Rel8.Table
161− Rel8.Table.ADT
162 Rel8.Table.Aggregate
134 Rel8.Table.Aggregate
163 Rel8.Table.Alternative
135 Rel8.Table.Alternative
164 Rel8.Table.Bool
136 Rel8.Table.Bool
165− Rel8.Table.Cols
166 Rel8.Table.Either
137 Rel8.Table.Either
167 Rel8.Table.Eq
138 Rel8.Table.Eq
168− Rel8.Table.HKD
139+ Rel8.Table.Insert
140+ Rel8.Table.Lifted
169 Rel8.Table.List
141 Rel8.Table.List
170 Rel8.Table.Maybe
142 Rel8.Table.Maybe
171 Rel8.Table.Name
143 Rel8.Table.Name
172 Rel8.Table.NonEmpty
144 Rel8.Table.NonEmpty
173− Rel8.Table.Null
174− Rel8.Table.Nullify
175 Rel8.Table.Opaleye
145 Rel8.Table.Opaleye
176 Rel8.Table.Ord
146 Rel8.Table.Ord
177 Rel8.Table.Order
147 Rel8.Table.Order
178− Rel8.Table.Projection
148+ Rel8.Table.Recontextualize
179− Rel8.Table.Rel8able
180 Rel8.Table.Serialize
149 Rel8.Table.Serialize
150+ Rel8.Table.Tag
181 Rel8.Table.These
151 Rel8.Table.These
182− Rel8.Table.Transpose
183 Rel8.Table.Undefined
152 Rel8.Table.Undefined
184− Rel8.Table.Window
185
153
186 Rel8.Type
154 Rel8.Type
187 Rel8.Type.Array
155 Rel8.Type.Array
188− Rel8.Type.Composite
156+ Rel8.Type.Array1D
189 Rel8.Type.Eq
157 Rel8.Type.Eq
190− Rel8.Type.Enum
191 Rel8.Type.Information
158 Rel8.Type.Information
192 Rel8.Type.JSONEncoded
159 Rel8.Type.JSONEncoded
193 Rel8.Type.JSONBEncoded
160 Rel8.Type.JSONBEncoded
@@ -200,8 +167,8 @@ library
200 Rel8.Type.Sum
167 Rel8.Type.Sum
201 Rel8.Type.Tag
168 Rel8.Type.Tag
202
169
203− Rel8.Window
170+ Rel8.Opaque
204−
171+ Rel8.Schema.Structure
205
172
206test-suite tests
173test-suite tests
207 type: exitcode-stdio-1.0
174 type: exitcode-stdio-1.0
@@ -211,9 +178,9 @@ test-suite tests
211 , case-insensitive
178 , case-insensitive
212 , containers
179 , containers
213 , hasql
180 , hasql
214− , hasql-transaction
215− , hedgehog ^>= 1.0 || ^>= 1.1
181+ , hedgehog ^>=1.0.2
216− , mmorph
182+ , lifted-base ^>=0.2.3.12
183+ , monad-control ^>=1.0.2.3
217 , rel8
184 , rel8
218 , scientific
185 , scientific
219 , tasty
186 , tasty
@@ -221,12 +188,8 @@ test-suite tests
221 , text
188 , text
222 , time
189 , time
223 , tmp-postgres ^>=1.34.1.0
190 , tmp-postgres ^>=1.34.1.0
224− , transformers
225 , uuid
191 , uuid
226
192
227− other-modules:
228− Rel8.Generic.Rel8able.Test
229−
230 main-is: Main.hs
193 main-is: Main.hs
231 hs-source-dirs: tests
194 hs-source-dirs: tests
232 default-language: Haskell2010
195 default-language: Haskell2010
@@ -235,3 +198,16 @@ test-suite tests
235 -Wno-missing-import-lists -Wno-prepositive-qualified-module
198 -Wno-missing-import-lists -Wno-prepositive-qualified-module
236 -Wno-deprecations -Wno-monomorphism-restriction
199 -Wno-deprecations -Wno-monomorphism-restriction
237 -Wno-missing-local-signatures -Wno-implicit-prelude
200 -Wno-missing-local-signatures -Wno-implicit-prelude
201+
202+test-suite doctests
203+ type: exitcode-stdio-1.0
204+ build-depends:
205+ base
206+ , base-compat
207+ , bytestring
208+ , doctest
209+ , hasql
210+ , tmp-postgres
211+
212+ main-is: Doctest.hs
213+ default-language: Haskell2010
shell.nix+4−4
@@ -1,11 +1,11 @@
1let
1let
2 sources = import ./nix/sources.nix;
2 sources = import ./nix/sources.nix;
3− pkgs = import sources.nixpkgs {overlays = [];};
3+ pkgs = import sources.nixpkgs {};
4 hsPkgs = import ./default.nix;
4 hsPkgs = import ./default.nix;
5in
5in
6 hsPkgs.shellFor {
6 hsPkgs.shellFor {
7− withHoogle = false;
7+ withHoogle = true;
8− tools = { cabal = "latest"; };
8+ tools = { cabal = "3.2.0.0"; haskell-language-server = "latest"; };
9 exactDeps = false;
9 exactDeps = false;
10− buildInputs = [ pkgs.postgresql pkgs.pythonPackages.sphinx ];
10+ buildInputs = [ pkgs.postgresql ];
11 }
11 }
src/Rel8.hs+406−378
@@ -1,7 +1,19 @@
1{-# language DuplicateRecordFields #-}
1{-# language DuplicateRecordFields #-}
2
2
3module Rel8
3module Rel8
4+ ( -- * Getting Started
5+ -- $setup
6+
7+ -- ** Writing Queries
8+ -- $guideQueries
9+
10+ -- ** Joins
11+ -- $guideJoins
12+
13+ -- ** Aggregation
14+ -- $guideAggregation
15+
4− ( -- * Database types
16+ -- * Database types
5 -- ** @DBType@
17 -- ** @DBType@
6 DBType(..)
18 DBType(..)
7
19
@@ -13,10 +25,6 @@ module Rel8
13 -- **** @ReadShow@
25 -- **** @ReadShow@
14 , ReadShow(..)
26 , ReadShow(..)
15
27
16− -- **** Generic
17− , Composite(..), DBComposite(..), compose, decompose
18− , Enum(..), DBEnum(..), Enumable
19−
20 -- *** @TypeInformation@
28 -- *** @TypeInformation@
21 , TypeInformation(..)
29 , TypeInformation(..)
22 , mapTypeInformation
30 , mapTypeInformation
@@ -28,42 +36,32 @@ module Rel8
28 , DBNum
36 , DBNum
29 , DBIntegral
37 , DBIntegral
30 , DBFractional
38 , DBFractional
31− , DBFloating
32
39
33 -- * Tables and higher-kinded tables
40 -- * Tables and higher-kinded tables
34− , Rel8able, KRel8able
41+ , Rel8able
35− , Column
42+ , Column, Field, Necessity( Required, Optional )
36− , HADT
43+ , Default, Label
37− , HEither
38 , HMaybe
44 , HMaybe
39 , HList
45 , HList
40 , HNonEmpty
46 , HNonEmpty
41− , HNull
42 , HThese
47 , HThese
43− , Lift
44
48
45− , Table(..)
49+ , Table
46− , HTable
47− , Transposes
48 , AltTable((<|>:))
50 , AltTable((<|>:))
49− , AlternativeTable( emptyTable )
50− , EqTable(..), (==:), (/=:)
51+ , EqTable, (==:), (/=:)
51− , OrdTable(..), (<:), (<=:), (>:), (>=:), ascTable, descTable, greatest, least
52+ , OrdTable, ascTable, descTable
52 , lit
53 , lit
53 , bool
54 , bool
54 , case_
55 , case_
55− , castTable
56
56
57 -- ** @MaybeTable@
57 -- ** @MaybeTable@
58 , MaybeTable
58 , MaybeTable
59 , maybeTable, ($?), nothingTable, justTable
59 , maybeTable, ($?), nothingTable, justTable
60 , isNothingTable, isJustTable
60 , isNothingTable, isJustTable
61− , fromMaybeTable
62 , optional
61 , optional
63 , catMaybeTable
62 , catMaybeTable
63+ , bindMaybeTable
64 , traverseMaybeTable
64 , traverseMaybeTable
65− , aggregateMaybeTable
66− , nameMaybeTable
67
65
68 -- ** @EitherTable@
66 -- ** @EitherTable@
69 , EitherTable
67 , EitherTable
@@ -71,9 +69,8 @@ module Rel8
71 , isLeftTable, isRightTable
69 , isLeftTable, isRightTable
72 , keepLeftTable
70 , keepLeftTable
73 , keepRightTable
71 , keepRightTable
72+ , bindEitherTable
74 , bitraverseEitherTable
73 , bitraverseEitherTable
75− , aggregateEitherTable
76− , nameEitherTable
77
74
78 -- ** @TheseTable@
75 -- ** @TheseTable@
79 , TheseTable
76 , TheseTable
@@ -81,73 +78,22 @@ module Rel8
81 , isThisTable, isThatTable, isThoseTable
78 , isThisTable, isThatTable, isThoseTable
82 , hasHereTable, hasThereTable
79 , hasHereTable, hasThereTable
83 , justHereTable, justThereTable
80 , justHereTable, justThereTable
84− , alignMaybeTable
85 , alignBy
81 , alignBy
86 , keepHereTable, loseHereTable
82 , keepHereTable, loseHereTable
87 , keepThereTable, loseThereTable
83 , keepThereTable, loseThereTable
88 , keepThisTable, loseThisTable
84 , keepThisTable, loseThisTable
89 , keepThatTable, loseThatTable
85 , keepThatTable, loseThatTable
90 , keepThoseTable, loseThoseTable
86 , keepThoseTable, loseThoseTable
87+ , bindTheseTable
91 , bitraverseTheseTable
88 , bitraverseTheseTable
92− , aggregateTheseTable
93− , nameTheseTable
94
89
95 -- ** @ListTable@
90 -- ** @ListTable@
96 , ListTable
91 , ListTable
97− , listTable, ($*)
98− , nameListTable
99 , many
92 , many
100− , manyExpr
101− , catListTable
102− , catList
103
93
104 -- ** @NonEmptyTable@
94 -- ** @NonEmptyTable@
105 , NonEmptyTable
95 , NonEmptyTable
106− , nonEmptyTable, ($+)
107− , nameNonEmptyTable
108 , some
96 , some
109− , someExpr
110− , catNonEmptyTable
111− , catNonEmpty
112−
113− -- ** @NullTable@
114− , NullTable
115− , nullableTable, nullTable, nullifyTable
116− , isNullTable, isNonNullTable
117− , catNullTable
118− , nameNullTable
119− , toNullTable, toMaybeTable
120−
121− -- ** Algebraic data types / sum types
122− -- $adts
123−
124− -- *** Naming of ADTs
125− -- $naming
126− , NameADT, nameADT
127− , ADT, ADTable
128−
129− -- *** Deconstruction of ADTs
130− -- $deconstruction
131− , DeconstructADT, deconstructADT
132−
133− -- *** Construction of ADTs
134− -- $construction
135− , BuildADT, buildADT
136− , ConstructADT, constructADT
137−
138− -- *** Other ADT operations
139− , AggregateADT, aggregateADT
140−
141− -- *** Miscellaneous notes
142− -- $misc-notes
143−
144− -- ** @HKD@
145− , HKD, HKDable
146− , BuildHKD, buildHKD
147− , ConstructHKD, constructHKD
148− , DeconstructHKD, deconstructHKD
149− , NameHKD, nameHKD
150− , AggregateHKD, aggregateHKD
151
97
152 -- ** Table schemas
98 -- ** Table schemas
153 , TableSchema(..)
99 , TableSchema(..)
@@ -160,20 +106,16 @@ module Rel8
160 , Sql
106 , Sql
161 , litExpr
107 , litExpr
162 , unsafeCastExpr
108 , unsafeCastExpr
163− , unsafeLiteral
164
109
165 -- ** @null@
110 -- ** @null@
166− , NotNull
167− , Nullable
168− , Homonullable
169 , null
111 , null
170 , nullify
112 , nullify
171 , nullable
113 , nullable
172 , isNull
114 , isNull
173 , isNonNull
115 , isNonNull
174− , mapNull
116+ , mapNullable
175− , liftOpNull
117+ , liftOpNullable
176− , catNull
118+ , catNullable
177 , coalesce
119 , coalesce
178
120
179 -- ** Boolean operations
121 -- ** Boolean operations
@@ -184,7 +126,6 @@ module Rel8
184 , (==.), (/=.), (==?), (/=?)
126 , (==.), (/=.), (==?), (/=?)
185 , in_
127 , in_
186 , boolExpr, caseExpr
128 , boolExpr, caseExpr
187− , like, ilike
188
129
189 -- ** Ordering
130 -- ** Ordering
190 , DBOrd
131 , DBOrd
@@ -202,13 +143,6 @@ module Rel8
202 , Query
143 , Query
203 , showQuery
144 , showQuery
204
145
205− -- ** Projection
206− , Projection
207− , Projectable( project )
208− , Biprojectable( biproject )
209− , Projecting
210− , Field
211−
212 -- ** Selecting rows
146 -- ** Selecting rows
213 , Selects
147 , Selects
214 , each
148 , each
@@ -217,8 +151,8 @@ module Rel8
217 -- ** Filtering
151 -- ** Filtering
218 , filter
152 , filter
219 , where_
153 , where_
220− , present
154+ , whereExists
221− , absent
155+ , whereNotExists
222 , distinct
156 , distinct
223 , distinctOn
157 , distinctOn
224 , distinctOnBy
158 , distinctOnBy
@@ -248,16 +182,14 @@ module Rel8
248
182
249 -- ** Aggregation
183 -- ** Aggregation
250 , Aggregate
184 , Aggregate
251− , Aggregates
252 , aggregate
185 , aggregate
253 , countRows
186 , countRows
254− , groupBy
255 , listAgg, listAggExpr
187 , listAgg, listAggExpr
256− , mode
257 , nonEmptyAgg, nonEmptyAggExpr
188 , nonEmptyAgg, nonEmptyAggExpr
189+ , groupBy
258 , DBMax, max
190 , DBMax, max
259 , DBMin, min
191 , DBMin, min
260− , DBSum, sum, sumWhere, avg
192+ , DBSum, sum, sumWhere
261 , DBString, stringAgg
193 , DBString, stringAgg
262 , count
194 , count
263 , countStar
195 , countStar
@@ -266,6 +198,11 @@ module Rel8
266 , and
198 , and
267 , or
199 , or
268
200
201+ , Aggregates
202+ , sequenceAggregate
203+ , distributeAggregate
204+
205+
269 -- ** Ordering
206 -- ** Ordering
270 , orderBy
207 , orderBy
271 , Order
208 , Order
@@ -274,71 +211,43 @@ module Rel8
274 , nullsFirst
211 , nullsFirst
275 , nullsLast
212 , nullsLast
276
213
277− -- ** Window functions
278− , Window
279− , window
280− , Partition
281− , over
282− , partitionBy
283− , orderPartitionBy
284− , cumulative
285− , cumulative_
286− , currentRow
287− , rowNumber
288− , rank
289− , denseRank
290− , percentRank
291− , cumeDist
292− , ntile
293− , lag
294− , lead
295− , firstValue
296− , lastValue
297− , nthValue
298− , indexed
299−
300− -- ** Bindings
301− , rebind
302−
303 -- * IO
214 -- * IO
304 , Serializable
215 , Serializable
305− , ToExprs
306− , Result
307
216
308 -- * Running statements
217 -- * Running statements
309− -- $running
310−
311 -- ** @SELECT@
218 -- ** @SELECT@
312 , select
219 , select
313
220
314 -- ** @INSERT@
221 -- ** @INSERT@
315 , Insert(..)
222 , Insert(..)
316 , OnConflict(..)
223 , OnConflict(..)
317− , Upsert(..)
318 , insert
224 , insert
319− , unsafeDefault
225+ , toInsert
320− , showInsert
226+ , toInsertDefaults
321
227
322 -- ** @DELETE@
228 -- ** @DELETE@
323 , Delete(..)
229 , Delete(..)
324 , delete
230 , delete
325− , showDelete
326
231
327 -- ** @UPDATE@
232 -- ** @UPDATE@
328− , Update(..)
329 , update
233 , update
330− , showUpdate
234+ , Update(..)
331
235
332 -- ** @.. RETURNING@
236 -- ** @.. RETURNING@
333 , Returning(..)
237 , Returning(..)
334
238
335 -- ** @CREATE VIEW@
239 -- ** @CREATE VIEW@
336 , createView
240 , createView
337− , createOrReplaceView
338
241
339− -- ** Sequences
242+ -- * TODO
340− , nextval
243+ -- TODO
341− , evaluate
244+ -- These need organizing, but are reachable from Rel8's documentation so we
245+ -- do need to export and document them.
246+ , HasNullability
247+ , NotNull
248+ , HTable
249+ , Labelable
250+ , Context
342 ) where
251 ) where
343
252
344-- base
253-- base
@@ -346,94 +255,65 @@ import Prelude ()
346
255
347-- rel8
256-- rel8
348import Rel8.Aggregate
257import Rel8.Aggregate
349−import Rel8.Column
350−import Rel8.Column.ADT
351−import Rel8.Column.Either
352−import Rel8.Column.Lift
353−import Rel8.Column.List
354−import Rel8.Column.Maybe
355−import Rel8.Column.NonEmpty
356−import Rel8.Column.Null
357−import Rel8.Column.These
358import Rel8.Expr
258import Rel8.Expr
359import Rel8.Expr.Aggregate
259import Rel8.Expr.Aggregate
360import Rel8.Expr.Bool
260import Rel8.Expr.Bool
361−import Rel8.Expr.Default
362import Rel8.Expr.Eq
261import Rel8.Expr.Eq
363import Rel8.Expr.Function
262import Rel8.Expr.Function
364import Rel8.Expr.Null
263import Rel8.Expr.Null
365−import Rel8.Expr.Opaleye (unsafeCastExpr, unsafeLiteral)
366import Rel8.Expr.Ord
264import Rel8.Expr.Ord
367import Rel8.Expr.Order
265import Rel8.Expr.Order
368import Rel8.Expr.Serialize
266import Rel8.Expr.Serialize
369−import Rel8.Expr.Sequence
370−import Rel8.Expr.Text ( like, ilike )
371−import Rel8.Expr.Window hiding ( cumulative )
372−import Rel8.Generic.Rel8able ( KRel8able, Rel8able )
373import Rel8.Order
267import Rel8.Order
374import Rel8.Query
268import Rel8.Query
375import Rel8.Query.Aggregate
269import Rel8.Query.Aggregate
376import Rel8.Query.Distinct
270import Rel8.Query.Distinct
377import Rel8.Query.Each
271import Rel8.Query.Each
378import Rel8.Query.Either
272import Rel8.Query.Either
379−import Rel8.Query.Evaluate
380import Rel8.Query.Exists
273import Rel8.Query.Exists
381import Rel8.Query.Filter
274import Rel8.Query.Filter
382−import Rel8.Query.Indexed
383import Rel8.Query.Limit
275import Rel8.Query.Limit
384import Rel8.Query.List
276import Rel8.Query.List
385import Rel8.Query.Maybe
277import Rel8.Query.Maybe
386import Rel8.Query.Null
278import Rel8.Query.Null
387import Rel8.Query.Order
279import Rel8.Query.Order
388−import Rel8.Query.Rebind
389import Rel8.Query.SQL (showQuery)
280import Rel8.Query.SQL (showQuery)
390import Rel8.Query.Set
281import Rel8.Query.Set
391import Rel8.Query.These
282import Rel8.Query.These
392import Rel8.Query.Values
283import Rel8.Query.Values
393−import Rel8.Query.Window
284+import Rel8.Schema.Column
285+import Rel8.Schema.Context.Label
394−import Rel8.Schema.Field
286+import Rel8.Schema.Generic
395import Rel8.Schema.HTable
287import Rel8.Schema.HTable
396import Rel8.Schema.Name
288import Rel8.Schema.Name
397−import Rel8.Schema.Null hiding ( nullable )
289+import Rel8.Schema.Nullability
398−import Rel8.Schema.Result ( Result )
399import Rel8.Schema.Table
290import Rel8.Schema.Table
400import Rel8.Statement.Delete
291import Rel8.Statement.Delete
401import Rel8.Statement.Insert
292import Rel8.Statement.Insert
402−import Rel8.Statement.OnConflict
403import Rel8.Statement.Returning
293import Rel8.Statement.Returning
404import Rel8.Statement.Select
294import Rel8.Statement.Select
405−import Rel8.Statement.SQL
406import Rel8.Statement.Update
295import Rel8.Statement.Update
407import Rel8.Statement.View
296import Rel8.Statement.View
408import Rel8.Table
297import Rel8.Table
409−import Rel8.Table.ADT
410import Rel8.Table.Aggregate
298import Rel8.Table.Aggregate
411import Rel8.Table.Alternative
299import Rel8.Table.Alternative
412import Rel8.Table.Bool
300import Rel8.Table.Bool
413import Rel8.Table.Either
301import Rel8.Table.Either
414import Rel8.Table.Eq
302import Rel8.Table.Eq
415−import Rel8.Table.HKD
303+import Rel8.Table.Insert
416import Rel8.Table.List
304import Rel8.Table.List
417import Rel8.Table.Maybe
305import Rel8.Table.Maybe
418import Rel8.Table.Name
306import Rel8.Table.Name
419import Rel8.Table.NonEmpty
307import Rel8.Table.NonEmpty
420−import Rel8.Table.Null
421−import Rel8.Table.Opaleye ( castTable )
422import Rel8.Table.Ord
308import Rel8.Table.Ord
423import Rel8.Table.Order
309import Rel8.Table.Order
424−import Rel8.Table.Projection
425−import Rel8.Table.Rel8able ()
426import Rel8.Table.Serialize
310import Rel8.Table.Serialize
427import Rel8.Table.These
311import Rel8.Table.These
428−import Rel8.Table.Transpose
429−import Rel8.Table.Window
430import Rel8.Type
312import Rel8.Type
431−import Rel8.Type.Composite
432import Rel8.Type.Eq
313import Rel8.Type.Eq
433−import Rel8.Type.Enum
434import Rel8.Type.Information
314import Rel8.Type.Information
435−import Rel8.Type.JSONBEncoded
436import Rel8.Type.JSONEncoded
315import Rel8.Type.JSONEncoded
316+import Rel8.Type.JSONBEncoded
437import Rel8.Type.Monoid
317import Rel8.Type.Monoid
438import Rel8.Type.Num
318import Rel8.Type.Num
439import Rel8.Type.Ord
319import Rel8.Type.Ord
@@ -441,216 +321,364 @@ import Rel8.Type.ReadShow
441import Rel8.Type.Semigroup
321import Rel8.Type.Semigroup
442import Rel8.Type.String
322import Rel8.Type.String
443import Rel8.Type.Sum
323import Rel8.Type.Sum
444−import Rel8.Window
324+import Rel8.Expr.Opaleye (unsafeCastExpr)
445−
325+import Rel8.Kind.Necessity
446−
326+import Rel8.Schema.Field (Field)
447−-- $running
327+
448−-- To run queries and otherwise interact with a PostgreSQL database, Rel8
328+
449−-- provides 'select', 'insert', 'update' and 'delete' functions. Note that
329+-- $setup
450−-- 'insert', 'update' and 'delete' will generally need the
330+--
451−-- `DuplicateRecordFields` language extension enabled.
331+-- In this section, we'll take a look at using Rel8 to work with a small
452−
332+-- database for Haskell packages. We'll take a look at idiomatic usage of Rel8,
453−-- $adts
333+-- mapping tables to Haskell, and then look at writing some simple queries.
454−-- Algebraic data types can be modelled between Haskell and SQL.
334+--
335+-- The documentation in this library uses the following language extensions:
336+--
337+-- >>> :set -XBlockArguments
338+-- >>> :set -XDeriveAnyClass
339+-- >>> :set -XDeriveGeneric
340+-- >>> :set -XDerivingStrategies
341+-- >>> :set -XDerivingVia
342+-- >>> :set -XDuplicateRecordFields
343+-- >>> :set -XGeneralizedNewtypeDeriving
344+-- >>> :set -XOverloadedStrings
345+-- >>> :set -XStandaloneDeriving
346+-- >>> :set -XTypeApplications
347+-- >>> :set -XTypeFamilies
348+--
349+-- Before we start writing any Haskell, let's take a look at the schema we'll
350+-- work with.
351+--
352+-- > author: project:
353+-- >
354+-- > Column │ Type │ Nullable Column │ Type │ Nullable
355+-- > ═══════════╪═════════╪══════════ ═══════════╪═════════╪══════════
356+-- > author_id │ integer │ not null author_id │ integer │ not null
357+-- > name │ text │ not null name │ text │ not null
358+-- > url │ text │
359+--
360+-- Our schema consists of two tables - @author@ and @project@. A @project@
361+-- always has an @author@, but not all @author@s have projects. Each @author@
362+-- has a name and (maybe) an associated website, and each project has a name.
363+--
364+-- Now that we've seen our schema, we can begin writing a mapping in Rel8. The
365+-- idiomatic way to map a table is to use a record that is parameterised what
366+-- Rel8 calls an /interpretation functor/, and to define each field with
367+-- 'Column'. For this type to be usable with Rel8 we need it to be an instance
368+-- of 'HigherKindedTable', which can be derived with a combination of
369+-- @DeriveAnyClass@ and @DeriveGeneric@.
370+--
371+-- Following these steps for @author@, we have:
372+--
373+-- > data Author f = Author
374+-- > { authorId :: Column f Int64
375+-- > , name :: Column f Text
376+-- > , url :: Column f (Maybe Text)
377+-- > } deriving (Generic, HigherKindedTable)
378+--
379+-- This is a perfectly reasonable definition, but cautious readers might notice
380+-- a problem - in particular, with the type of the @authorId@ field. While
381+-- @Int64@ is correct, it's not the best type. If we had other identifier types
382+-- in our project, it would be too easy to accidentally mix them up and create
383+-- nonsensical joins. As Haskell programmers, we often solve this problem by
384+-- creating @newtype@ wrappers, and we can also use this technique with Rel8:
385+--
386+-- >>> :{
387+-- newtype AuthorId = AuthorId { toInt64 :: Int64 }
388+-- deriving newtype (DBEq, DBType, Eq, Show)
389+-- :}
455--
390--
456−-- * Your SQL table needs a certain text field that tags which Haskell constructor is in use.
391+-- Now we can write our final schema mapping. First, the @author@ table:
457−-- * You have to use a few combinators to specify the sum type's individual constructors.
458−-- * If you want to do case analysis at the @Expr@ (SQL) level, you can use 'maybe'/'either'-like eliminators.
459--
392--
460−-- The documentation in this section will assume a set of database types like this:
393+-- >>> :{
394+-- data Author f = Author
395+-- { authorId :: Column f AuthorId
396+-- , authorName :: Column f Text
397+-- , authorUrl :: Column f (Maybe Text)
398+-- }
399+-- deriving stock Generic
400+-- deriving anyclass HigherKindedTable
401+-- :}
461--
402--
462−-- @
403+-- And similarly, the @project@ table:
463−-- data Thing f = ThingEmployer (Employer f) | ThingPotato (Potato f) | Nullary
464−-- deriving stock Generic
465--
404--
466−-- data Employer f = Employer { employerId :: f Int32, employerName :: f Text}
405+-- >>> :{
406+-- data Project f = Project
407+-- { projectAuthorId :: Column f AuthorId
408+-- , projectName :: Column f Text
409+-- }
467-- deriving stock Generic
410-- deriving stock Generic
468−-- deriving anyclass Rel8able
411+-- deriving anyclass HigherKindedTable
412+-- :}
469--
413--
470−-- data Potato f = Potato { size :: f Int32, grower :: f Text }
414+-- To show query results in this documentation, we'll also need @Show@
471−-- deriving stock Generic
415+-- instances: Unfortunately these definitions look a bit scary, but they are
472−-- deriving anyclass Rel8able
416+-- essentially just @deriving (Show)@:
473−-- @
417+--
474−
418+-- >>> deriving stock instance f ~ Identity => Show (Author f)
475−-- $naming
419+-- >>> deriving stock instance f ~ Identity => Show (Project f)
420+--
421+-- These data types describe the structural mapping of the tables, but we also
422+-- need to specify a 'TableSchema' for each table. A @TableSchema@ contains the
423+-- name of the table and the name of all columns in the table, which will
424+-- ultimately allow us to @SELECT@ and @INSERT@ rows for these tables.
425+--
426+-- To define a @TableSchema@, we just need to fill construct appropriate
427+-- @TableSchema@ values. When it comes to the @tableColumns@ field, we
428+-- construct values of our data types above, and set each field to the name of
429+-- the column that it maps to:
430+--
431+-- First, @authorSchema@ describes the column names of the @author@ table when
432+-- associated with the @Author@ type:
433+--
434+-- >>> :{
435+-- authorSchema :: TableSchema (Author ColumnSchema)
436+-- authorSchema = TableSchema
437+-- { tableName = "author"
438+-- , tableSchema = Nothing
439+-- , tableColumns = Author
440+-- { authorId = "author_id"
441+-- , authorName = "name"
442+-- , authorUrl = "url"
443+-- }
444+-- }
445+-- :}
446+--
447+-- And likewise for @project@ and @Project@:
448+--
449+-- >>> :{
450+-- projectSchema :: TableSchema (Project ColumnSchema)
451+-- projectSchema = TableSchema
452+-- { tableName = "project"
453+-- , tableSchema = Nothing
454+-- , tableColumns = Project
455+-- { projectAuthorId = "author_id"
456+-- , projectName = "name"
457+-- }
458+-- }
459+-- :}
460+--
461+-- Aside: you might be wondering why this information isn't in the definitions
462+-- of @Author@ and @Project@ above. Rel8 decouples @TableSchema@ from the data
463+-- types themselves, as not all tables you define will necessarily have a
464+-- schema. For example, Rel8 allows you to define helper types to simplify the
465+-- types of queries - these tables only exist at query time, but there is no
466+-- corresponding base table. We'll see more on this idea later!
467+--
468+-- With these table definitions, we can now start writing some queries! To
469+-- actually run a query, we'll need a database connection. Rel8 uses the
470+-- @hasql@ library, and for this documentation we'll get the connection string
471+-- from the @$TEST_DATABASE_URL@ environment variable.
476−--
472+--
477−-- First, in your 'TableSchema', name your type like this:
473+-- >>> connectionString <- System.Environment.getEnv "TEST_DATABASE_URL"
478−--
474+-- >>> Right c <- Hasql.Connection.acquire (Data.ByteString.Char8.pack connectionString)
475+-- >>> Control.Monad.void $ Hasql.Session.run (Hasql.Session.sql "BEGIN") c
476+
477+-- $guideQueries
478+--
479+-- First, we'll take a look at @SELECT@ statements - usually the bulk of most
480+-- database heavy applications.
481+--
482+-- In Rel8, @SELECT@ statements are built using the 'Query' monad. You can
483+-- think of this monad like the ordinary @[]@ (List) monad - but this isn't
484+-- required knowledge.
485+--
486+-- To start, we'll look at one of the simplest queries possible - a basic
487+-- @SELECT * FROM@ statement. To select all rows from a table, we use 'each',
488+-- and supply a 'TableSchema'. So to select all @project@ rows, we can write:
489+--
490+-- >>> :t each projectSchema
491+-- each projectSchema :: Query (Project Expr)
492+--
493+-- Notice that @each@ gives us a @Query@ that yields @Project Expr@ rows. To
494+-- see what this means, let's have a look at a single field of a
495+-- @Project Expr@:
496+--
497+-- >>> let aProjectExpr = undefined :: Project Expr
498+-- >>> :t projectAuthorId aProjectExpr
499+-- projectAuthorId aProjectExpr :: Expr AuthorId
500+--
501+-- Recall we defined @projectAuthorId@ as @Column f AuthorId@. Now we have @f@
502+-- is @Expr@, and @Column Expr AuthorId@ reduces to @Expr AuthorId@. We'll see
503+-- more about @Expr@ soon, but you can think of @Expr a@ as "SQL expressions of
504+-- type @a@".
505+--
506+-- To execute this @Query@, we pass it to 'select':
507+--
508+-- >>> :t select c (each projectSchema)
509+-- select c (each projectSchema) :: MonadIO m => m [Project Identity]
510+--
511+-- When we @select@ things containing @Expr@s, Rel8 builds a new response table
512+-- with the @Identity@ interpretation. This means you'll get back plain Haskell
513+-- values. Studying @projectAuthorId@ again, we have:
514+--
515+-- >>> let aProjectIdentity = undefined :: Project Identity
516+-- >>> :t projectAuthorId aProjectIdentity
517+-- projectAuthorId aProjectIdentity :: AuthorId
518+--
519+-- Here @Column Identity AuthorId@ reduces to just @AuthorId@, with no
520+-- wrappping type at all.
521+--
522+-- Putting this all together, we can run our first query:
523+--
524+-- >>> select c (each projectSchema) >>= mapM_ print
525+-- Project {projectAuthorId = 1, projectName = "rel8"}
526+-- Project {projectAuthorId = 2, projectName = "aeson"}
527+-- Project {projectAuthorId = 2, projectName = "text"}
528+--
529+-- Cool!
530+--
531+-- We now know that 'each' is the equivalent of a @SELECT *@ query, but
532+-- sometimes we're only interested in a subset of the columns of a table. To
533+-- restrict the returned columns, we can specify a projection by using 'Query's
534+-- @Functor@ instance:
479−-- @
535+--
480−-- thingSchema :: TableSchema (ADT Thing Name)
536+-- >>> select c $ projectName <$> each projectSchema
481−-- thingSchema =
537+-- ["rel8","aeson","text"]
482−-- TableSchema
538+
483−-- { schema = Nothing,
539+-- $guideJoins
484−-- name = \"thing\",
540+--
485−-- columns =
541+-- Another common operation in relational databases is to take the @JOIN@ of
486−-- nameADT @Thing
542+-- multiple tables. Rel8 doesn't have a specific join operation, but we can
487−-- \"tag\"
543+-- recover the functionality of a join by selecting all rows of two tables, and
488−-- Employer
544+-- then using 'where_' to filter them.
489−-- { employerName = \"name\",
490−-- employerId = \"id\"
491−-- }
492−-- Potato {size = \"size\", grower = \"Mary\"}
493−-- }
494−-- @
495−--
496−-- Note that @nameADT \@Thing "tag"@ is variadic: it accepts one
497−-- argument per constructor, except the nullary ones (Nullary) because
498−-- there's nothing to do for them.
499−
500−-- $deconstruction
501−--
545+--
502−-- To deconstruct sum types at the SQL level, use 'deconstructADT',
546+-- To see how this works, first let's look at taking the product of two tables.
503−-- which is also variadic, and has one argument for each
547+-- We can do this by simply calling 'each' twice, and then returning a tuple of
504−-- constructor. Similar to 'maybe'.
548+-- their results.
505−--
549+--
506−-- @
550+-- >>> :{
507−-- query :: Query (ADT Thing Expr)
551+-- mapM_ print =<< select c do
508−-- query = do
552+-- author <- each authorSchema
509−-- thingExpr <- each thingSchema
553+-- project <- each projectSchema
510−-- where_ $
554+-- return (projectName project, authorName author)
511−-- deconstructADT @Thing
555+-- :}
512−-- (\employer -> employerName employer ==. lit \"Mary\")
556+-- ("rel8","Ollie")
513−-- (\potato -> grower potato ==. lit \"Mary\")
557+-- ("rel8","Bryan O'Sullivan")
514−-- (lit False) -- Nullary case
558+-- ("rel8","Emily Pillmore")
515−-- thingExpr
559+-- ("aeson","Ollie")
516−-- pure thingExpr
560+-- ("aeson","Bryan O'Sullivan")
517−-- @
561+-- ("aeson","Emily Pillmore")
518−--
562+-- ("text","Ollie")
519−-- SQL output:
563+-- ("text","Bryan O'Sullivan")
520−--
564+-- ("text","Emily Pillmore")
521−-- @
565+--
522−-- SELECT
566+-- This isn't quite right, though, as we have ended up pairing up the wrong
523−-- CAST("tag0_1" AS text) as "tag",
567+-- projects and authors. To fix this, we can use 'where_' to restrict the
524−-- CAST("id1_1" AS int4) as "ThingEmployer/_1/employerId",
568+-- returned rows. We could write:
525−-- CAST("name2_1" AS text) as "ThingEmployer/_1/employerName",
526−-- CAST("size3_1" AS int4) as "ThingPotato/_1/size",
527−-- CAST("Mary4_1" AS text) as "ThingPotato/_1/grower"
528−-- FROM (SELECT
529−-- *
569+--
530−-- FROM (SELECT
570+-- > select c $ do
531−-- "tag" as "tag0_1",
571+-- > author <- each authorSchema
532−-- "id" as "id1_1",
572+-- > project <- each projectSchema
533−-- "name" as "name2_1",
573+-- > where_ $ projectAuthorId project ==. authorId author
534−-- "size" as "size3_1",
574+-- > return (project, author)
535−-- "Mary" as "Mary4_1"
575+--
536−-- FROM "thing" as "T1") as "T1"
576+-- but doing this every time you need a join can obscure the meaning of the
537−-- WHERE (CASE WHEN ("tag0_1") = (CAST(E'ThingPotato' AS text)) THEN ("Mary4_1") = (CAST(E'Mary' AS text))
577+-- query you're writing. A good practice is to introduce specialised functions
538−-- WHEN ("tag0_1") = (CAST(E'Nullary' AS text)) THEN CAST(FALSE AS bool) ELSE ("name2_1") = (CAST(E'Mary' AS text)) END)) as "T1"
578+-- for the particular joins in your database. In our case, this would be:
539−-- @
579+--
540−
580+-- >>> :{
541−-- $construction
581+-- projectsForAuthor :: Author Expr -> Query (Project Expr)
582+-- projectsForAuthor a = each projectSchema >>= filter \p ->
583+-- projectAuthorId p ==. authorId a
584+-- :}
542−--
585+--
543−-- To construct an ADT, you can use 'buildADT' or 'constructADT'. Consider the following type:
586+-- Our final query is then:
544−--
587+--
545−-- @
588+-- >>> :{
546−-- data Task f = Pending | Complete (CompletedTask f)
589+-- mapM_ print =<< select c do
590+-- author <- each authorSchema
591+-- project <- projectsForAuthor author
592+-- return (projectName project, authorName author)
593+-- :}
594+-- ("rel8","Ollie")
595+-- ("aeson","Bryan O'Sullivan")
596+-- ("text","Bryan O'Sullivan")
547−-- @
597+--
598+-- == @LEFT JOIN@s
548−--
599+--
549−-- 'buildADT' is for constructing values of 'Task' in the 'Expr'
600+-- Rel8 is also capable of performing @LEFT JOIN@s. To perform @LEFT JOIN@s, we
550−-- context. 'buildADT' needs two type-level arguments before its type
601+-- follow the same approach as before, but use the 'optional' query transformer
551−-- makes any sense. The first argument is the type of the "ADT", which
602+-- to allow for the possibility of the join to fail.
552−-- in our case is 'Task'. The second is the name of the constructor we
603+--
553−-- want to use. So that means we have the following possible
604+-- In our test database, we can see that there's another author who we haven't
554−-- instantiations of 'buildADT' for 'Task':
605+-- seen yet:
606+--
607+-- >>> select c $ authorName <$> each authorSchema
608+-- ["Ollie","Bryan O'Sullivan","Emily Pillmore"]
609+--
610+-- Emily wasn't returned in our earlier query because - in our database - she
611+-- doesn't have any registered projects. We can account for this partiality in
612+-- our original query by wrapping the @projectsForAuthor@ call with 'optional':
613+--
614+-- >>> :{
615+-- mapM_ print =<< select c do
616+-- author <- each authorSchema
617+-- mproject <- optional $ projectsForAuthor author
618+-- return (authorName author, projectName <$> mproject)
555−--
619+-- :}
556−-- @
620+-- ("Ollie",Just "rel8")
557−-- > :t buildADT @Task @\"Pending\"
621+-- ("Bryan O'Sullivan",Just "aeson")
558−-- buildADT @Task @\"Pending\" :: ADT Task Expr
622+-- ("Bryan O'Sullivan",Just "text")
559−-- > :t buildADT @Task @\"Complete\"
623+-- ("Emily Pillmore",Nothing)
560−-- buildADT @Task @\"Complete\" :: CompletedTask Expr -> ADT Task Expr
624+
561−-- @
625+-- $guideAggregation
562−--
626+--
563−-- Note that as the "Pending" constructor has no fields, @buildADT
627+-- Aggregations are operations like @sum@ and @count@ - operations that reduce
564−-- \@Task \@"Pending"@ is equivalent to @lit Pending@. But @buildADT
628+-- multiple rows to single values. To perform aggregations in Rel8, we can use
565−-- \@Task \@"Complete"@ is not the same as @lit . Complete@:
629+-- the 'aggregate' function, which takes a 'Query' of aggregated expressions,
630+-- runs the aggregation, and returns aggregated rows.
566−--
631+--
567−-- @
632+-- To start, let's look at a simple aggregation that tells us how many projects
568−-- > :t lit . Complete
633+-- exist:
569−-- lit . Complete :: CompletedTask Result -> ADT Task Expr
570−-- @
634+--
571−--
635+-- >>> error "TODO"
572−--
636+--
573−-- Note that the former takes a @CompletedTask Expr@ while the latter
637+-- Rel8 is also capable of aggregating multiple rows into a single row by
574−-- takes a @CompletedTask Result@. The former is more powerful because
638+-- concatenating all rows as a list. This aggregation allows us to break free
575−-- you can construct @Task@s using dynamic values coming a database
639+-- of the row-orientated nature of SQL and write queries that return tree-like
576−-- query.
640+-- structures. Earlier we saw an example of returning authors with their
577−--
641+-- projects, but the query didn't do a great job of describing the one-to-many
578−-- To show what this can look like in SQL, consider:
642+-- relationship between authors and their projects.
579−--
643+--
644+-- Let's look again at a query that returns authors and their projects, and
645+-- focus on the /type/ of that query.
646+--
647+-- >>> :{
648+-- projectsForAuthor a = each projectSchema >>= filter \p ->
649+-- projectAuthorId p ==. authorId a
580−-- @
650+-- :}
651+--
581−-- > :{
652+-- >>> :{
582−-- showQuery $ values
653+-- let authorsAndProjects = do
583−-- [ buildADT @Task @\"Pending\"
654+-- author <- each authorSchema
584−-- , buildADT @Task @\"Complete\" CompletedTask {date = Rel8.Expr.Time.now}
655+-- project <- projectsForAuthor author
585−-- ]
656+-- return (author, project)
657+-- where
658+-- :}
659+--
660+-- >>> :t select c authorsAndProjects
661+-- select c authorsAndProjects
662+-- :: MonadIO m => m [(Author Identity, Project Identity)]
663+--
664+-- Our query gives us a single list of pairs of authors and projects. However,
665+-- with our domain knowledge of the schema, this isn't a great type - what we'd
666+-- rather have is a list of pairs of authors and /lists/ of projects. That is,
667+-- what we'd like is:
668+--
669+-- > [(Author Identity, [Project Identity])]
670+--
671+-- This would be a much better type! Rel8 can produce a query with this type by
672+-- simply wrapping the call to @projectsForAuthor@ with either 'some' or
673+-- 'many'. Here we'll use 'many', which allows for the possibility of an author
674+-- to have no projects:
675+--
676+-- >>> :{
677+-- mapM_ print =<< select c do
678+-- author <- each authorSchema
679+-- projectNames <- many $ projectName <$> projectsForAuthor author
680+-- return (authorName author, projectNames)
586-- :}
681-- :}
587−-- @
682+-- ("Ollie",["rel8"])
588−--
683+-- ("Bryan O'Sullivan",["aeson","text"])
589−-- This produces the following SQL:
684+-- ("Emily Pillmore",[])
590−--
591−-- @
592−-- SELECT
593−-- CAST(\"values0_1\" AS text) as \"tag\",
594−-- CAST(\"values1_1\" AS timestamptz) as \"Complete/_1/date\"
595−-- FROM (SELECT
596−-- *
597−-- FROM (SELECT \"column1\" as \"values0_1\",
598−-- \"column2\" as \"values1_1\"
599−-- FROM
600−-- (VALUES
601−-- (CAST(E'Pending' AS text),CAST(NULL AS timestamptz)),
602−-- (CAST(E'Complete' AS text),CAST(now() AS timestamptz))) as \"V\") as \"T1\") as \"T1\"
603−-- @
604−--
605−-- This is what you get if you run it in @psql@:
606−--
607−--
608−-- @
609−-- tag | Complete/_1/date
610−-- ----------+-------------------------------
611−-- Pending |
612−-- Complete | 2022-05-19 21:28:23.969065+00
613−-- (2 rows)
614−-- @
615−--
616−-- "constructADT" is less convenient but more general alternative to
617−-- "buildADT". It requires only one type-level argument for its type
618−-- to make sense:
619−--
620−-- @
621−-- > :t constructADT @Task
622−-- constructADT @Task
623−-- :: (forall r. r -> (CompletedTask Expr -> r) -> r) -> ADT Task Expr
624−-- @
625−--
626−-- This might still seem a bit opaque, but basically it gives you a
627−-- Church-encoded constructor for arbitrary algebraic data types. You
628−-- might use it as follows:
629−--
630−-- @
631−-- let
632−-- pending :: ADT Task Expr
633−-- pending = constructADT @Task $ \pending _complete -> pending
634−--
635−-- complete :: ADT Task Expr
636−-- complete = constructADT @Task $ \_pending complete -> complete CompletedTask {date = Rel8.Expr.Time.now}
637−-- @
638−--
639−-- These values are otherwise identical to the ones we saw above with
640−-- @buildADT@, it's just a different style of constructing them.
641−--
642−
643−-- $misc-notes
644−--
645−-- 1. Note that the order of the arguments for all of these functions
646−-- is determined by the order of the constructors in the data
647−-- definition. If it were @data Task = Complete (CompletedTask f) |
648−-- Pending@ then the order of all the invocations of @constructADT@
649−-- and @deconstructADT@ would need to change.
650−--
651−-- 2. Maybe this is obvious, but just to spell it out: once you're in
652−-- the @Result@ context, you can of course construct @Task@ values
653−-- normally and use standard Haskell pattern-matching. @constructADT@
654−-- and @deconstructADT@ are specifically only needed in the @Expr@
655−-- context, and they allow you to do the equivalent of pattern
656−-- matching in PostgreSQL.
src/Rel8/Aggregate.hs+119−46
@@ -1,83 +1,156 @@
1{-# language DataKinds #-}
1{-# language DataKinds #-}
2+{-# language DerivingVia #-}
2{-# language FlexibleContexts #-}
3{-# language FlexibleContexts #-}
3{-# language FlexibleInstances #-}
4{-# language FlexibleInstances #-}
5+{-# language GADTs #-}
6+{-# language GeneralizedNewtypeDeriving #-}
4{-# language MultiParamTypeClasses #-}
7{-# language MultiParamTypeClasses #-}
5−{-# language RankNTypes #-}
8+{-# language NamedFieldPuns #-}
6{-# language StandaloneKindSignatures #-}
9{-# language StandaloneKindSignatures #-}
7{-# language TypeFamilies #-}
10{-# language TypeFamilies #-}
8{-# language UndecidableInstances #-}
11{-# language UndecidableInstances #-}
12+{-# language UndecidableSuperClasses #-}
9
13
10module Rel8.Aggregate
14module Rel8.Aggregate
11− ( Aggregate(..), zipOutputs
15+ ( Aggregate(..), foldInputs, mapInputs
12− , unsafeMakeAggregate
16+ , Aggregator(..), unsafeMakeAggregate
13 , Aggregates
17 , Aggregates
18+ , Col( Aggregation )
14 )
19 )
15where
20where
16
21
17-- base
22-- base
18−import Control.Applicative ( liftA2 )
23+import Data.Functor.Const ( Const( Const ), getConst )
19−import Data.Functor.Identity ( Identity( Identity ) )
24+import Data.Functor.Identity ( Identity )
20import Data.Kind ( Constraint, Type )
25import Data.Kind ( Constraint, Type )
21import Prelude
26import Prelude
22
27
23−-- profunctors
24−import Data.Profunctor ( dimap )
25−
26-- opaleye
28-- opaleye
27−import qualified Opaleye.Aggregate as Opaleye
29+import qualified Opaleye.Internal.Aggregate as Opaleye
28import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
30import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
29−import qualified Opaleye.Internal.Column as Opaleye
31+import qualified Opaleye.Internal.PackMap as Opaleye
30
32
31-- rel8
33-- rel8
32−import Rel8.Expr ( Expr )
34+import Rel8.Expr ( Expr, Col(..) )
35+import Rel8.Opaque ( Opaque )
36+import Rel8.Schema.Context ( Interpretation(..) )
37+import Rel8.Schema.Context.Label ( Labelable(..) )
33−import Rel8.Schema.HTable.Identity ( HIdentity(..) )
38+import Rel8.Schema.HTable ( hfield, htabulate, htabulateA, hspecs )
34−import qualified Rel8.Schema.Kind as K
39+import Rel8.Schema.Name ( Name )
35−import Rel8.Schema.Null ( Sql )
40+import Rel8.Schema.Nullability ( Sql )
36−import Rel8.Table
41+import Rel8.Schema.Spec ( Spec( Spec ), SSpec(..) )
37− ( Table, Columns, Context, fromColumns, toColumns
42+import Rel8.Table ( Table, Columns, Context, fromColumns, toColumns )
38− , FromExprs, fromResult, toResult
43+import Rel8.Table.Recontextualize ( Recontextualize )
39− , Transpose
40− )
41−import Rel8.Table.Transpose ( Transposes )
42import Rel8.Type ( DBType )
44import Rel8.Type ( DBType )
43
45
46+-- semigroupoids
47+import Data.Functor.Apply ( Apply, WrappedApplicative(..) )
48+
49+
50+-- | An @Aggregate a@ describes how to aggregate @Table@s of type @a@. You can
51+-- unpack an @Aggregate@ back to @a@ by running it with 'aggregate'. As
52+-- @Aggregate@ is almost an 'Applicative' functor - but there is no 'pure'
53+-- operation. This means 'Aggregate' is an instance of 'Apply', and you can
54+-- combine @Aggregate@s using the @<.>@ combinator.
55+type Aggregate :: Type -> Type
56+newtype Aggregate a = Aggregate (Opaleye.Aggregator () a)
57+ deriving newtype Functor
58+ deriving Apply via (WrappedApplicative (Opaleye.Aggregator ()))
44
59
45−-- | 'Aggregate' is a special context used by 'Rel8.aggregate'.
46−type Aggregate :: K.Context
47−newtype Aggregate a = Aggregate (Opaleye.Aggregator () (Expr a))
48
60
61+instance Interpretation Aggregate where
62+ data Col Aggregate _spec where
63+ Aggregation :: ()
64+ => Aggregate (Expr a)
65+ -> Col Aggregate ('Spec labels necessity a)
49
66
67+
50−instance Sql DBType a => Table Aggregate (Aggregate a) where
68+instance Table Expr a => Table Aggregate (Aggregate a) where
51− type Columns (Aggregate a) = HIdentity a
69+ type Columns (Aggregate a) = Columns a
52 type Context (Aggregate a) = Aggregate
70 type Context (Aggregate a) = Aggregate
53− type FromExprs (Aggregate a) = a
54− type Transpose to (Aggregate a) = to a
55
71
56− toColumns = HIdentity
72+ toColumns a = htabulate $ \field -> case hfield hspecs field of
57− fromColumns (HIdentity a) = a
73+ SSpec {} -> Aggregation $ unDB . (`hfield` field) . toColumns <$> a
58− toResult = HIdentity . Identity
74+ fromColumns as = fmap fromColumns $ htabulateA $ \field ->
59− fromResult (HIdentity (Identity a)) = a
75+ case hfield as field of
76+ Aggregation a -> DB <$> a
77+
78+
79+instance Sql DBType a =>
80+ Recontextualize Aggregate Aggregate (Aggregate (Expr a)) (Aggregate (Expr a))
81+
82+
83+instance Sql DBType a =>
84+ Recontextualize Aggregate Expr (Aggregate (Expr a)) (Expr a)
85+
86+
87+instance Sql DBType a =>
88+ Recontextualize Aggregate Identity (Aggregate (Expr a)) (Identity a)
89+
90+
91+instance Sql DBType a =>
92+ Recontextualize Aggregate Name (Aggregate (Expr a)) (Name a)
60
93
61
94
95+instance Sql DBType a =>
96+ Recontextualize Expr Aggregate (Expr a) (Aggregate (Expr a))
97+
98+
99+instance Sql DBType a =>
100+ Recontextualize Identity Aggregate (Identity a) (Aggregate (Expr a))
101+
102+
103+instance Sql DBType a =>
104+ Recontextualize Name Aggregate (Name a) (Aggregate (Expr a))
105+
106+
107+instance Labelable Aggregate where
108+ labeler (Aggregation aggregate) = Aggregation aggregate
109+ unlabeler (Aggregation aggregate) = Aggregation aggregate
110+
111+
62−-- | @Aggregates a b@ means that the columns in @a@ are all 'Aggregate's
112+-- | @Aggregates a b@ means that the columns in @a@ are all 'Aggregate' 'Expr's
63−-- for the 'Expr' columns in @b@.
113+-- for the columns in @b@.
64type Aggregates :: Type -> Type -> Constraint
114type Aggregates :: Type -> Type -> Constraint
65−class Transposes Aggregate Expr aggregates exprs => Aggregates aggregates exprs
115+class Recontextualize Aggregate Expr aggregates exprs => Aggregates aggregates exprs
66−instance Transposes Aggregate Expr aggregates exprs => Aggregates aggregates exprs
116+instance Recontextualize Aggregate Expr aggregates exprs => Aggregates aggregates exprs
117+instance {-# OVERLAPPING #-} Aggregates (Opaque Aggregate Opaque) (Opaque Expr Opaque)
118+
119+
120+foldInputs :: Monoid b
121+ => (Maybe Aggregator -> Opaleye.PrimExpr -> b) -> Aggregate a -> b
122+foldInputs f (Aggregate (Opaleye.Aggregator (Opaleye.PackMap agg))) =
123+ getConst $ flip agg () $ \(aggregator, a) ->
124+ Const $ f (detuplize <$> aggregator) a
125+ where
126+ detuplize (operation, ordering, distinction) =
127+ Aggregator {operation, ordering, distinction}
128+
129+
130+mapInputs :: ()
131+ => (Opaleye.PrimExpr -> Opaleye.PrimExpr) -> Aggregate a -> Aggregate a
132+mapInputs transform (Aggregate (Opaleye.Aggregator (Opaleye.PackMap agg))) =
133+ Aggregate $ Opaleye.Aggregator $ Opaleye.PackMap $ agg . \f input ->
134+ f (fmap transform input)
67
135
68
136
69−zipOutputs :: ()
137+type Aggregator :: Type
70− => (Expr a -> Expr b -> Expr c) -> Aggregate a -> Aggregate b -> Aggregate c
138+data Aggregator = Aggregator
71−zipOutputs f (Aggregate a) (Aggregate b) = Aggregate (liftA2 f a b)
139+ { operation :: Opaleye.AggrOp
140+ , ordering :: [Opaleye.OrderExpr]
141+ , distinction :: Opaleye.AggrDistinct
142+ }
72
143
73
144
74−unsafeMakeAggregate :: forall (input :: Type) (output :: Type) n n' a a'. ()
145+unsafeMakeAggregate :: ()
75− => (Expr input -> Opaleye.PrimExpr)
146+ => (input -> Opaleye.PrimExpr)
76− -> (Opaleye.PrimExpr -> Expr output)
147+ -> (Opaleye.PrimExpr -> output)
77− -> Opaleye.Aggregator (Opaleye.Field_ n a) (Opaleye.Field_ n' a')
148+ -> Maybe Aggregator
78− -> Expr input
149+ -> input
79 -> Aggregate output
150 -> Aggregate output
80unsafeMakeAggregate input output aggregator expr =
151unsafeMakeAggregate input output aggregator expr =
81− Aggregate $ dimap in_ out aggregator
152+ Aggregate $ Opaleye.Aggregator $ Opaleye.PackMap $ \f _ ->
82− where out = output . Opaleye.unColumn
153+ output <$> f (tuplize <$> aggregator, input expr)
83− in_ = Opaleye.Column . input . const expr
154+ where
155+ tuplize Aggregator {operation, ordering, distinction} =
156+ (operation, ordering, distinction)
src/Rel8/Column.hsdeleted−31
@@ -1,31 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language StandaloneKindSignatures #-}
3−{-# language TypeFamilies #-}
4−
5−module Rel8.Column
6− ( Column
7− , TColumn
8− )
9−where
10−
11−-- base
12−import Data.Kind ( Type )
13−import Prelude ()
14−
15−-- rel8
16−import Rel8.FCF ( Eval, Exp )
17−import qualified Rel8.Schema.Kind as K
18−import Rel8.Schema.Result ( Result )
19−
20−
21−-- | This type family is used to specify columns in 'Rel8able's. In @Column f
22−-- a@, @f@ is the context of the column (which should be left polymorphic in
23−-- 'Rel8able' definitions), and @a@ is the type of the column.
24−type Column :: K.Context -> Type -> Type
25−type family Column context a where
26− Column Result a = a
27− Column context a = context a
28−
29−
30−data TColumn :: K.Context -> Type -> Exp Type
31−type instance Eval (TColumn f a) = Column f a
src/Rel8/Column/ADT.hsdeleted−23
@@ -1,23 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language StandaloneKindSignatures #-}
3−{-# language TypeFamilies #-}
4−
5−module Rel8.Column.ADT
6− ( HADT
7− )
8−where
9−
10−-- base
11−import Data.Kind ( Type )
12−import Prelude ()
13−
14−-- rel8
15−import qualified Rel8.Schema.Kind as K
16−import Rel8.Schema.Result ( Result )
17−import Rel8.Table.ADT ( ADT )
18−
19−
20−type HADT :: K.Context -> K.Rel8able -> Type
21−type family HADT context t where
22− HADT Result t = t Result
23− HADT context t = ADT t context
src/Rel8/Column/Either.hsdeleted−26
@@ -1,26 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language StandaloneKindSignatures #-}
3−{-# language TypeFamilyDependencies #-}
4−
5−module Rel8.Column.Either
6− ( HEither
7− )
8−where
9−
10−-- base
11−import Data.Kind ( Type )
12−import Prelude
13−
14−-- rel8
15−import qualified Rel8.Schema.Kind as K
16−import Rel8.Schema.Result ( Result )
17−import Rel8.Table.Either ( EitherTable )
18−
19−
20−-- | Nest an 'Either' value within a 'Rel8able'. @HEither f a b@ will produce a
21−-- 'EitherTable' @a b@ in the 'Expr' context, and a 'Either' @a b@ in the
22−-- 'Result' context.
23−type HEither :: K.Context -> Type -> Type -> Type
24−type family HEither context = either | either -> context where
25− HEither Result = Either
26− HEither context = EitherTable context
src/Rel8/Column/Lift.hsdeleted−23
@@ -1,23 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language StandaloneKindSignatures #-}
3−{-# language TypeFamilies #-}
4−
5−module Rel8.Column.Lift
6− ( Lift
7− )
8−where
9−
10−-- base
11−import Data.Kind ( Type )
12−import Prelude ()
13−
14−-- rel8
15−import qualified Rel8.Schema.Kind as K
16−import Rel8.Schema.Result ( Result )
17−import Rel8.Table.HKD ( HKD )
18−
19−
20−type Lift :: K.Context -> Type -> Type
21−type family Lift context a where
22− Lift Result a = a
23− Lift context a = HKD a context
src/Rel8/Column/List.hsdeleted−25
@@ -1,25 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language StandaloneKindSignatures #-}
3−{-# language TypeFamilyDependencies #-}
4−
5−module Rel8.Column.List
6− ( HList
7− )
8−where
9−
10−-- base
11−import Data.Kind ( Type )
12−import Prelude ()
13−
14−-- rel8
15−import qualified Rel8.Schema.Kind as K
16−import Rel8.Schema.Result ( Result )
17−import Rel8.Table.List ( ListTable )
18−
19−
20−-- | Nest a list within a 'Rel8able'. @HList f a@ will produce a 'ListTable'
21−-- @a@ in the 'Expr' context, and a @[a]@ in the 'Result' context.
22−type HList :: K.Context -> Type -> Type
23−type family HList context = list | list -> context where
24− HList Result = []
25− HList context = ListTable context
src/Rel8/Column/Maybe.hsdeleted−26
@@ -1,26 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language StandaloneKindSignatures #-}
3−{-# language TypeFamilyDependencies #-}
4−
5−module Rel8.Column.Maybe
6− ( HMaybe
7− )
8−where
9−
10−-- base
11−import Data.Kind ( Type )
12−import Prelude
13−
14−-- rel8
15−import qualified Rel8.Schema.Kind as K
16−import Rel8.Schema.Result ( Result )
17−import Rel8.Table.Maybe ( MaybeTable )
18−
19−
20−-- | Nest a 'Maybe' value within a 'Rel8able'. @HMaybe f a@ will produce a
21−-- 'MaybeTable' @a@ in the 'Expr' context, and a 'Maybe' @a@ in the 'Result'
22−-- context.
23−type HMaybe :: K.Context -> Type -> Type
24−type family HMaybe context = maybe | maybe -> context where
25− HMaybe Result = Maybe
26− HMaybe context = MaybeTable context
src/Rel8/Column/NonEmpty.hsdeleted−27
@@ -1,27 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language StandaloneKindSignatures #-}
3−{-# language TypeFamilyDependencies #-}
4−
5−module Rel8.Column.NonEmpty
6− ( HNonEmpty
7− )
8−where
9−
10−-- base
11−import Data.Kind ( Type )
12−import Data.List.NonEmpty ( NonEmpty )
13−import Prelude ()
14−
15−-- rel8
16−import qualified Rel8.Schema.Kind as K
17−import Rel8.Schema.Result ( Result )
18−import Rel8.Table.NonEmpty ( NonEmptyTable )
19−
20−
21−-- | Nest a 'NonEmpty' list within a 'Rel8able'. @HNonEmpty f a@ will produce a
22−-- 'NonEmptyTable' @a@ in the 'Expr' context, and a 'NonEmpty' @a@ in the
23−-- 'Result' context.
24−type HNonEmpty :: K.Context -> Type -> Type
25−type family HNonEmpty context = nonEmpty | nonEmpty -> context where
26− HNonEmpty Result = NonEmpty
27− HNonEmpty context = NonEmptyTable context
src/Rel8/Column/Null.hsdeleted−26
@@ -1,26 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language StandaloneKindSignatures #-}
3−{-# language TypeFamilyDependencies #-}
4−
5−module Rel8.Column.Null
6− ( HNull
7− )
8−where
9−
10−-- base
11−import Data.Kind ( Type )
12−import Prelude
13−
14−-- rel8
15−import qualified Rel8.Schema.Kind as K
16−import Rel8.Schema.Result ( Result )
17−import Rel8.Table.Null ( NullTable )
18−
19−
20−-- | Nest a 'Null' value within a 'Rel8able'. @HNull f a@ will produce a
21−-- 'NullTable' @a@ in the 'Expr' context, and a @'Maybe' a@ in the 'Result'
22−-- context.
23−type HNull :: K.Context -> Type -> Type
24−type family HNull context = maybe | maybe -> context where
25− HNull Result = Maybe
26− HNull context = NullTable context
src/Rel8/Column/These.hsdeleted−29
@@ -1,29 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language StandaloneKindSignatures #-}
3−{-# language TypeFamilyDependencies #-}
4−
5−module Rel8.Column.These
6− ( HThese
7− )
8−where
9−
10−-- base
11−import Data.Kind ( Type )
12−import Prelude ()
13−
14−-- rel8
15−import qualified Rel8.Schema.Kind as K
16−import Rel8.Schema.Result ( Result )
17−import Rel8.Table.These ( TheseTable )
18−
19−-- these
20−import Data.These ( These )
21−
22−
23−-- | Nest an 'These' value within a 'Rel8able'. @HThese f a b@ will produce a
24−-- 'TheseTable' @a b@ in the 'Expr' context, and a 'These' @a b@ in the
25−-- 'Result' context.
26−type HThese :: K.Context -> Type -> Type -> Type
27−type family HThese context = these | these -> context where
28− HThese Result = These
29− HThese context = TheseTable context
src/Rel8/Expr.hs+49−48
@@ -1,21 +1,26 @@
1{-# language DataKinds #-}
1{-# language DataKinds #-}
2{-# language DerivingStrategies #-}
2{-# language DerivingStrategies #-}
3−{-# language FlexibleContexts #-}
4{-# language FlexibleInstances #-}
3{-# language FlexibleInstances #-}
4+{-# language GADTs #-}
5{-# language MultiParamTypeClasses #-}
5{-# language MultiParamTypeClasses #-}
6+{-# language NamedFieldPuns #-}
7+{-# language RoleAnnotations #-}
6{-# language ScopedTypeVariables #-}
8{-# language ScopedTypeVariables #-}
7{-# language StandaloneKindSignatures #-}
9{-# language StandaloneKindSignatures #-}
8{-# language TypeApplications #-}
10{-# language TypeApplications #-}
9{-# language TypeFamilies #-}
11{-# language TypeFamilies #-}
10{-# language UndecidableInstances #-}
12{-# language UndecidableInstances #-}
13+{-# language UndecidableSuperClasses #-}
11
14
12module Rel8.Expr
15module Rel8.Expr
13 ( Expr(..)
16 ( Expr(..)
17+ , Col( DB, unDB )
14 )
18 )
15where
19where
16
20
17-- base
21-- base
18−import Data.Functor.Identity ( Identity( Identity ) )
22+import Data.Functor.Identity ( Identity )
23+import Data.Kind ( Type )
19import Data.String ( IsString, fromString )
24import Data.String ( IsString, fromString )
20import Prelude hiding ( null )
25import Prelude hiding ( null )
21
26
@@ -23,8 +28,7 @@ import Prelude hiding ( null )
23import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
28import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
24
29
25-- rel8
30-- rel8
26−import Rel8.Expr.Function ( function, nullaryFunction )
31+import Rel8.Expr.Null ( liftOpNullable, nullify )
27−import Rel8.Expr.Null ( liftOpNull, nullify )
28import Rel8.Expr.Opaleye
32import Rel8.Expr.Opaleye
29 ( castExpr
33 ( castExpr
30 , fromPrimExpr
34 , fromPrimExpr
@@ -32,44 +36,47 @@ import Rel8.Expr.Opaleye
32 , zipPrimExprsWith
36 , zipPrimExprsWith
33 )
37 )
34import Rel8.Expr.Serialize ( litExpr )
38import Rel8.Expr.Serialize ( litExpr )
35−import Rel8.Schema.HTable.Identity ( HIdentity( HIdentity ) )
39+import Rel8.Schema.Context ( Interpretation, Col )
40+import Rel8.Schema.Context.Label ( Labelable, labeler, unlabeler )
41+import Rel8.Schema.HTable.Type ( HType( HType ) )
36−import qualified Rel8.Schema.Kind as K
42+import Rel8.Schema.Nullability
37−import Rel8.Schema.Null ( Nullity( Null, NotNull ), Sql, nullable )
43+ ( Nullability( Nullable, NonNullable )
38−import Rel8.Table
44+ , Sql, nullabilization
39− ( Table, Columns, Context, fromColumns, toColumns
40− , FromExprs, fromResult, toResult
41− , Transpose
42 )
45 )
46+import Rel8.Schema.Spec ( Spec( Spec ) )
47+import Rel8.Table ( Table, Columns, Context, fromColumns, toColumns )
48+import Rel8.Table.Recontextualize ( Recontextualize )
43import Rel8.Type ( DBType )
49import Rel8.Type ( DBType )
44import Rel8.Type.Monoid ( DBMonoid, memptyExpr )
50import Rel8.Type.Monoid ( DBMonoid, memptyExpr )
45−import Rel8.Type.Num ( DBFloating, DBFractional, DBNum )
51+import Rel8.Type.Num ( DBFractional, DBNum )
46import Rel8.Type.Semigroup ( DBSemigroup, (<>.) )
52import Rel8.Type.Semigroup ( DBSemigroup, (<>.) )
47
53
48
54
49-- | Typed SQL expressions.
55-- | Typed SQL expressions.
50−type Expr :: K.Context
56+type role Expr representational
57+type Expr :: Type -> Type
51newtype Expr a = Expr Opaleye.PrimExpr
58newtype Expr a = Expr Opaleye.PrimExpr
52 deriving stock Show
59 deriving stock Show
53
60
54
61
55instance Sql DBSemigroup a => Semigroup (Expr a) where
62instance Sql DBSemigroup a => Semigroup (Expr a) where
56− (<>) = case nullable @a of
63+ (<>) = case nullabilization @a of
57− Null -> liftOpNull (<>.)
64+ Nullable -> liftOpNullable (<>.)
58− NotNull -> (<>.)
65+ NonNullable -> (<>.)
59 {-# INLINABLE (<>) #-}
66 {-# INLINABLE (<>) #-}
60
67
61
68
62instance Sql DBMonoid a => Monoid (Expr a) where
69instance Sql DBMonoid a => Monoid (Expr a) where
63− mempty = case nullable @a of
70+ mempty = case nullabilization @a of
64− Null -> nullify memptyExpr
71+ Nullable -> nullify memptyExpr
65− NotNull -> memptyExpr
72+ NonNullable -> memptyExpr
66 {-# INLINABLE mempty #-}
73 {-# INLINABLE mempty #-}
67
74
68
75
69instance (Sql IsString a, Sql DBType a) => IsString (Expr a) where
76instance (Sql IsString a, Sql DBType a) => IsString (Expr a) where
70− fromString = litExpr . case nullable @a of
77+ fromString = litExpr . case nullabilization @a of
71− Null -> Just . fromString
78+ Nullable -> Just . fromString
72− NotNull -> fromString
79+ NonNullable -> fromString
73
80
74
81
75instance Sql DBNum a => Num (Expr a) where
82instance Sql DBNum a => Num (Expr a) where
@@ -92,34 +99,28 @@ instance Sql DBFractional a => Fractional (Expr a) where
92 castExpr . Expr . Opaleye.ConstExpr . Opaleye.NumericLit . realToFrac
99 castExpr . Expr . Opaleye.ConstExpr . Opaleye.NumericLit . realToFrac
93
100
94
101
95−instance Sql DBFloating a => Floating (Expr a) where
102+instance Interpretation Expr where
96− pi = nullaryFunction "PI"
103+ data Col Expr _spec where
97− exp = function "exp"
104+ DB :: {unDB :: Expr a} -> Col Expr ('Spec labels necessity a)
98− log = function "ln"
99− sqrt = function "sqrt"
100− (**) = zipPrimExprsWith (Opaleye.BinExpr (Opaleye.:^))
101− logBase = function "log"
102− sin = function "sin"
103− cos = function "cos"
104− tan = function "tan"
105− asin = function "asin"
106− acos = function "acos"
107− atan = function "atan"
108− sinh = function "sinh"
109− cosh = function "cosh"
110− tanh = function "tanh"
111− asinh = function "asinh"
112− acosh = function "acosh"
113− atanh = function "atanh"
114
105
115
106
116instance Sql DBType a => Table Expr (Expr a) where
107instance Sql DBType a => Table Expr (Expr a) where
117− type Columns (Expr a) = HIdentity a
108+ type Columns (Expr a) = HType a
118 type Context (Expr a) = Expr
109 type Context (Expr a) = Expr
119− type FromExprs (Expr a) = a
120− type Transpose to (Expr a) = to a
121
110
122− toColumns a = HIdentity a
111+ toColumns a = HType (DB a)
123− fromColumns (HIdentity a) = a
112+ fromColumns (HType (DB a)) = a
124− toResult a = HIdentity (Identity a)
113+
125− fromResult (HIdentity (Identity a)) = a
114+
115+instance Sql DBType a => Recontextualize Expr Expr (Expr a) (Expr a)
116+
117+
118+instance Sql DBType a => Recontextualize Expr Identity (Expr a) (Identity a)
119+
120+
121+instance Sql DBType a => Recontextualize Identity Expr (Identity a) (Expr a)
122+
123+
124+instance Labelable Expr where
125+ labeler (DB a) = DB a
126+ unlabeler (DB a) = DB a
src/Rel8/Expr.hs-boot+4−5
@@ -1,4 +1,4 @@
1−{-# language DataKinds #-}
1+{-# language RoleAnnotations #-}
2{-# language StandaloneKindSignatures #-}
2{-# language StandaloneKindSignatures #-}
3
3
4module Rel8.Expr
4module Rel8.Expr
@@ -7,14 +7,13 @@ module Rel8.Expr
7where
7where
8
8
9-- base
9-- base
10+import Data.Kind ( Type )
10import Prelude ()
11import Prelude ()
11
12
12-- opaleye
13-- opaleye
13import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
14import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
14
15
15−-- rel8
16−import Rel8.Schema.Kind ( Context )
17
16
18−
17+type role Expr representational
19−type Expr :: Context
18+type Expr :: Type -> Type
20newtype Expr a = Expr Opaleye.PrimExpr
19newtype Expr a = Expr Opaleye.PrimExpr
src/Rel8/Expr/Aggregate.hs+83−59
@@ -1,6 +1,7 @@
1{-# language DataKinds #-}
1{-# language DataKinds #-}
2{-# language FlexibleContexts #-}
2{-# language FlexibleContexts #-}
3{-# language ScopedTypeVariables #-}
3{-# language ScopedTypeVariables #-}
4+{-# language TypeApplications #-}
4{-# language TypeFamilies #-}
5{-# language TypeFamilies #-}
5
6
6{-# options_ghc -fno-warn-redundant-constraints #-}
7{-# options_ghc -fno-warn-redundant-constraints #-}
@@ -10,11 +11,9 @@ module Rel8.Expr.Aggregate
10 , and, or
11 , and, or
11 , min, max
12 , min, max
12 , sum, sumWhere
13 , sum, sumWhere
13− , avg
14 , stringAgg
14 , stringAgg
15 , groupByExpr
15 , groupByExpr
16 , listAggExpr, nonEmptyAggExpr
16 , listAggExpr, nonEmptyAggExpr
17− , slistAggExpr, snonEmptyAggExpr
18 )
17 )
19where
18where
20
19
@@ -24,12 +23,10 @@ import Data.List.NonEmpty ( NonEmpty )
24import Prelude hiding ( and, max, min, null, or, sum )
23import Prelude hiding ( and, max, min, null, or, sum )
25
24
26-- opaleye
25-- opaleye
27−import qualified Opaleye.Internal.Aggregate as Opaleye
26+import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
28−import Opaleye.Internal.Column ( Field_( Column ) )
29−import qualified Opaleye.Aggregate as Opaleye
30
27
31-- rel8
28-- rel8
32−import Rel8.Aggregate ( Aggregate, unsafeMakeAggregate )
29+import Rel8.Aggregate ( Aggregate, Aggregator(..), unsafeMakeAggregate )
33import Rel8.Expr ( Expr )
30import Rel8.Expr ( Expr )
34import Rel8.Expr.Bool ( caseExpr )
31import Rel8.Expr.Bool ( caseExpr )
35import Rel8.Expr.Opaleye
32import Rel8.Expr.Opaleye
@@ -40,11 +37,9 @@ import Rel8.Expr.Opaleye
40 )
37 )
41import Rel8.Expr.Null ( null )
38import Rel8.Expr.Null ( null )
42import Rel8.Expr.Serialize ( litExpr )
39import Rel8.Expr.Serialize ( litExpr )
43−import Rel8.Schema.Null ( Sql, Unnullify )
40+import Rel8.Schema.Nullability ( Sql )
44−import Rel8.Type ( DBType, typeInformation )
45−import Rel8.Type.Array ( encodeArrayElement )
41+import Rel8.Type.Array ( fromPrimArray )
46import Rel8.Type.Eq ( DBEq )
42import Rel8.Type.Eq ( DBEq )
47−import Rel8.Type.Information ( TypeInformation )
48import Rel8.Type.Num ( DBNum )
43import Rel8.Type.Num ( DBNum )
49import Rel8.Type.Ord ( DBMax, DBMin )
44import Rel8.Type.Ord ( DBMax, DBMin )
50import Rel8.Type.String ( DBString )
45import Rel8.Type.String ( DBString )
@@ -52,99 +47,128 @@ import Rel8.Type.Sum ( DBSum )
52
47
53
48
54-- | Count the occurances of a single column. Corresponds to @COUNT(a)@
49-- | Count the occurances of a single column. Corresponds to @COUNT(a)@
55−count :: Expr a -> Aggregate Int64
50+count :: Expr a -> Aggregate (Expr Int64)
56−count = unsafeMakeAggregate toPrimExpr fromPrimExpr Opaleye.count
51+count = unsafeMakeAggregate toPrimExpr fromPrimExpr $
52+ Just Aggregator
53+ { operation = Opaleye.AggrCount
54+ , ordering = []
55+ , distinction = Opaleye.AggrAll
56+ }
57+
57
58
58-- | Count the number of distinct occurances of a single column. Corresponds to
59-- | Count the number of distinct occurances of a single column. Corresponds to
59-- @COUNT(DISTINCT a)@
60-- @COUNT(DISTINCT a)@
60−countDistinct :: Sql DBEq a => Expr a -> Aggregate Int64
61+countDistinct :: Sql DBEq a => Expr a -> Aggregate (Expr Int64)
61countDistinct = unsafeMakeAggregate toPrimExpr fromPrimExpr $
62countDistinct = unsafeMakeAggregate toPrimExpr fromPrimExpr $
62− Opaleye.distinctAggregator Opaleye.count
63+ Just Aggregator
64+ { operation = Opaleye.AggrCount
65+ , ordering = []
66+ , distinction = Opaleye.AggrDistinct
67+ }
63
68
64
69
65-- | Corresponds to @COUNT(*)@.
70-- | Corresponds to @COUNT(*)@.
66−countStar :: Aggregate Int64
71+countStar :: Aggregate (Expr Int64)
67countStar = count (litExpr True)
72countStar = count (litExpr True)
68
73
69
74
70-- | A count of the number of times a given expression is @true@.
75-- | A count of the number of times a given expression is @true@.
71−countWhere :: Expr Bool -> Aggregate Int64
76+countWhere :: Expr Bool -> Aggregate (Expr Int64)
72countWhere condition = count (caseExpr [(condition, litExpr (Just True))] null)
77countWhere condition = count (caseExpr [(condition, litExpr (Just True))] null)
73
78
74
79
75-- | Corresponds to @bool_and@.
80-- | Corresponds to @bool_and@.
76−and :: Expr Bool -> Aggregate Bool
81+and :: Expr Bool -> Aggregate (Expr Bool)
77−and = unsafeMakeAggregate toPrimExpr fromPrimExpr Opaleye.boolAnd
82+and = unsafeMakeAggregate toPrimExpr fromPrimExpr $
83+ Just Aggregator
84+ { operation = Opaleye.AggrBoolAnd
85+ , ordering = []
86+ , distinction = Opaleye.AggrAll
87+ }
78
88
79
89
80-- | Corresponds to @bool_or@.
90-- | Corresponds to @bool_or@.
81−or :: Expr Bool -> Aggregate Bool
91+or :: Expr Bool -> Aggregate (Expr Bool)
82−or = unsafeMakeAggregate toPrimExpr fromPrimExpr Opaleye.boolOr
92+or = unsafeMakeAggregate toPrimExpr fromPrimExpr $
93+ Just Aggregator
94+ { operation = Opaleye.AggrBoolOr
95+ , ordering = []
96+ , distinction = Opaleye.AggrAll
97+ }
83
98
84
99
85-- | Produce an aggregation for @Expr a@ using the @max@ function.
100-- | Produce an aggregation for @Expr a@ using the @max@ function.
86−max :: Sql DBMax a => Expr a -> Aggregate a
101+max :: Sql DBMax a => Expr a -> Aggregate (Expr a)
87−max = unsafeMakeAggregate toPrimExpr fromPrimExpr Opaleye.unsafeMax
102+max = unsafeMakeAggregate toPrimExpr fromPrimExpr $
103+ Just Aggregator
104+ { operation = Opaleye.AggrMax
105+ , ordering = []
106+ , distinction = Opaleye.AggrAll
107+ }
88
108
89
109
90-- | Produce an aggregation for @Expr a@ using the @max@ function.
110-- | Produce an aggregation for @Expr a@ using the @max@ function.
91−min :: Sql DBMin a => Expr a -> Aggregate a
111+min :: Sql DBMin a => Expr a -> Aggregate (Expr a)
92−min = unsafeMakeAggregate toPrimExpr fromPrimExpr Opaleye.unsafeMin
112+min = unsafeMakeAggregate toPrimExpr fromPrimExpr $
113+ Just Aggregator
114+ { operation = Opaleye.AggrMin
115+ , ordering = []
116+ , distinction = Opaleye.AggrAll
117+ }
93
118
94-- | Corresponds to @sum@. Note that in SQL, @sum@ is type changing - for
119-- | Corresponds to @sum@. Note that in SQL, @sum@ is type changing - for
95-- example the @sum@ of @integer@ returns a @bigint@. Rel8 doesn't support
120-- example the @sum@ of @integer@ returns a @bigint@. Rel8 doesn't support
96−-- this, and will add explicit casts back to the original input type. This can
121+-- this, and will add explicit cast back to the original input type. This can
97-- lead to overflows, and if you anticipate very large sums, you should upcast
122-- lead to overflows, and if you anticipate very large sums, you should upcast
98-- your input.
123-- your input.
99−sum :: Sql DBSum a => Expr a -> Aggregate a
124+sum :: Sql DBSum a => Expr a -> Aggregate (Expr a)
100−sum = unsafeMakeAggregate toPrimExpr (castExpr . fromPrimExpr) Opaleye.unsafeSum
125+sum = unsafeMakeAggregate toPrimExpr (castExpr . fromPrimExpr) $
101−
126+ Just Aggregator
127+ { operation = Opaleye.AggrSum
128+ , ordering = []
129+ , distinction = Opaleye.AggrAll
130+ }
102
131
103−-- | Corresponds to @avg@. Note that in SQL, @avg@ is type changing - for
104−-- example, the @avg@ of @integer@ returns a @numeric@. Rel8 doesn't support
105−-- this, and will add explicit casts back to the original input type. If you
106−-- need a fractional result on an integral column, you should cast your input
107−-- to 'Double' or 'Data.Scientific.Scientific' before calling 'avg'.
108−avg :: Sql DBSum a => Expr a -> Aggregate a
109−avg = unsafeMakeAggregate toPrimExpr (castExpr . fromPrimExpr) Opaleye.unsafeAvg
110
132
111−-- | Take the sum of all expressions that satisfy a predicate.
112sumWhere :: (Sql DBNum a, Sql DBSum a)
133sumWhere :: (Sql DBNum a, Sql DBSum a)
113− => Expr Bool -> Expr a -> Aggregate a
134+ => Expr Bool -> Expr a -> Aggregate (Expr a)
114sumWhere condition a = sum (caseExpr [(condition, a)] 0)
135sumWhere condition a = sum (caseExpr [(condition, a)] 0)
115
136
116
137
117-- | Corresponds to @string_agg()@.
138-- | Corresponds to @string_agg()@.
118stringAgg :: Sql DBString a
139stringAgg :: Sql DBString a
119− => Expr db -> Expr a -> Aggregate a
140+ => Expr db -> Expr a -> Aggregate (Expr a)
120stringAgg delimiter =
141stringAgg delimiter =
121− unsafeMakeAggregate toPrimExpr (castExpr . fromPrimExpr) (Opaleye.stringAgg (Column (toPrimExpr delimiter)))
142+ unsafeMakeAggregate toPrimExpr (castExpr . fromPrimExpr) $
143+ Just Aggregator
144+ { operation = Opaleye.AggrStringAggr (toPrimExpr delimiter)
145+ , ordering = []
146+ , distinction = Opaleye.AggrAll
147+ }
122
148
123
149
124-- | Aggregate a value by grouping by it.
150-- | Aggregate a value by grouping by it.
125−groupByExpr :: Sql DBEq a => Expr a -> Aggregate a
151+groupByExpr :: Sql DBEq a => Expr a -> Aggregate (Expr a)
126−groupByExpr = unsafeMakeAggregate toPrimExpr fromPrimExpr Opaleye.groupBy
152+groupByExpr = unsafeMakeAggregate toPrimExpr fromPrimExpr Nothing
127−
128−
129−-- | Collect expressions values as a list.
130−listAggExpr :: Sql DBType a => Expr a -> Aggregate [a]
131−listAggExpr = slistAggExpr typeInformation
132−
133−
134−-- | Collect expressions values as a non-empty list.
135−nonEmptyAggExpr :: Sql DBType a => Expr a -> Aggregate (NonEmpty a)
136−nonEmptyAggExpr = snonEmptyAggExpr typeInformation
137
153
138
154
139−slistAggExpr :: ()
140− => TypeInformation (Unnullify a) -> Expr a -> Aggregate [a]
155+listAggExpr :: Expr a -> Aggregate (Expr [a])
141−slistAggExpr info = unsafeMakeAggregate to fromPrimExpr Opaleye.arrayAgg
156+listAggExpr = unsafeMakeAggregate toPrimExpr from $ Just
157+ Aggregator
158+ { operation = Opaleye.AggrArr
159+ , ordering = []
160+ , distinction = Opaleye.AggrAll
161+ }
142 where
162 where
143− to = encodeArrayElement info . toPrimExpr
163+ from = fromPrimExpr . fromPrimArray
144
164
145
165
146−snonEmptyAggExpr :: ()
147− => TypeInformation (Unnullify a) -> Expr a -> Aggregate (NonEmpty a)
166+nonEmptyAggExpr :: Expr a -> Aggregate (Expr (NonEmpty a))
148−snonEmptyAggExpr info = unsafeMakeAggregate to fromPrimExpr Opaleye.arrayAgg
167+nonEmptyAggExpr = unsafeMakeAggregate toPrimExpr from $ Just
168+ Aggregator
169+ { operation = Opaleye.AggrArr
170+ , ordering = []
171+ , distinction = Opaleye.AggrAll
172+ }
149 where
173 where
150− to = encodeArrayElement info . toPrimExpr
174+ from = fromPrimExpr . fromPrimArray
src/Rel8/Expr/Array.hs+6−6
@@ -25,21 +25,21 @@ import Rel8.Expr.Opaleye
25 , zipPrimExprsWith
25 , zipPrimExprsWith
26 )
26 )
27import Rel8.Type ( DBType, typeInformation )
27import Rel8.Type ( DBType, typeInformation )
28−import Rel8.Type.Array ( array )
28+import Rel8.Type.Array ( array, zipPrimArraysWith )
29import Rel8.Type.Information ( TypeInformation(..) )
29import Rel8.Type.Information ( TypeInformation(..) )
30−import Rel8.Schema.Null ( Unnullify, Sql )
30+import Rel8.Schema.Nullability ( Unnullify, Nullability, Sql )
31
31
32
32
33sappend :: Expr [a] -> Expr [a] -> Expr [a]
33sappend :: Expr [a] -> Expr [a] -> Expr [a]
34−sappend = zipPrimExprsWith (Opaleye.BinExpr (Opaleye.:||))
34+sappend = zipPrimExprsWith (zipPrimArraysWith (Opaleye.BinExpr (Opaleye.:||)))
35
35
36
36
37sappend1 :: Expr (NonEmpty a) -> Expr (NonEmpty a) -> Expr (NonEmpty a)
37sappend1 :: Expr (NonEmpty a) -> Expr (NonEmpty a) -> Expr (NonEmpty a)
38−sappend1 = zipPrimExprsWith (Opaleye.BinExpr (Opaleye.:||))
38+sappend1 = zipPrimExprsWith (zipPrimArraysWith (Opaleye.BinExpr (Opaleye.:||)))
39
39
40
40
41−sempty :: TypeInformation (Unnullify a) -> Expr [a]
41+sempty :: Nullability a -> TypeInformation (Unnullify a) -> Expr [a]
42−sempty info = fromPrimExpr $ array info []
42+sempty _ info = fromPrimExpr $ array info []
43
43
44
44
45slistOf :: TypeInformation (Unnullify a) -> [Expr a] -> Expr [a]
45slistOf :: TypeInformation (Unnullify a) -> [Expr a] -> Expr [a]
src/Rel8/Expr/Bool.hs+42−8
@@ -1,5 +1,3 @@
1−{-# language GADTs #-}
2−
3module Rel8.Expr.Bool
1module Rel8.Expr.Bool
4 ( false, true
2 ( false, true
5 , (&&.), (||.), not_
3 , (&&.), (||.), not_
@@ -19,7 +17,7 @@ import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
19
17
20-- rel8
18-- rel8
21import {-# SOURCE #-} Rel8.Expr ( Expr( Expr ) )
19import {-# SOURCE #-} Rel8.Expr ( Expr( Expr ) )
22−import Rel8.Expr.Opaleye ( mapPrimExpr, toPrimExpr, zipPrimExprsWith )
20+import Rel8.Expr.Opaleye ( mapPrimExpr, zipPrimExprsWith )
23import Rel8.Expr.Serialize ( litExpr )
21import Rel8.Expr.Serialize ( litExpr )
24
22
25
23
@@ -34,28 +32,68 @@ true = litExpr True
34
32
35
33
36-- | The SQL @AND@ operator.
34-- | The SQL @AND@ operator.
35+--
36+-- >>> :{
37+-- mapM_ print =<< select c do
38+-- x <- values [lit True, lit False]
39+-- y <- values [lit True, lit False]
40+-- return (x, y, x &&. y)
41+-- :}
42+-- (True,True,True)
43+-- (True,False,False)
44+-- (False,True,False)
45+-- (False,False,False)
37(&&.) :: Expr Bool -> Expr Bool -> Expr Bool
46(&&.) :: Expr Bool -> Expr Bool -> Expr Bool
38(&&.) = zipPrimExprsWith (Opaleye.BinExpr Opaleye.OpAnd)
47(&&.) = zipPrimExprsWith (Opaleye.BinExpr Opaleye.OpAnd)
39infixr 3 &&.
48infixr 3 &&.
40
49
41
50
42-- | The SQL @OR@ operator.
51-- | The SQL @OR@ operator.
52+--
53+-- >>> :{
54+-- mapM_ print =<< select c do
55+-- x <- values [lit True, lit False]
56+-- y <- values [lit True, lit False]
57+-- return (x, y, x ||. y)
58+-- :}
59+-- (True,True,True)
60+-- (True,False,True)
61+-- (False,True,True)
62+-- (False,False,False)
43(||.) :: Expr Bool -> Expr Bool -> Expr Bool
63(||.) :: Expr Bool -> Expr Bool -> Expr Bool
44(||.) = zipPrimExprsWith (Opaleye.BinExpr Opaleye.OpOr)
64(||.) = zipPrimExprsWith (Opaleye.BinExpr Opaleye.OpOr)
45infixr 2 ||.
65infixr 2 ||.
46
66
47
67
48-- | The SQL @NOT@ operator.
68-- | The SQL @NOT@ operator.
69+--
70+-- >>> select c $ pure $ not_ $ lit True
71+-- [False]
72+--
73+-- >>> select c $ pure $ not_ $ lit False
74+-- [True]
49not_ :: Expr Bool -> Expr Bool
75not_ :: Expr Bool -> Expr Bool
50not_ = mapPrimExpr (Opaleye.UnExpr Opaleye.OpNot)
76not_ = mapPrimExpr (Opaleye.UnExpr Opaleye.OpNot)
51
77
52
78
53-- | Fold @AND@ over a collection of expressions.
79-- | Fold @AND@ over a collection of expressions.
80+--
81+-- >>> select c $ pure $ and_ [ lit True ==. lit False, lit False, lit True ]
82+-- [False]
83+--
84+-- >>> select c $ pure $ and_ []
85+-- [True]
54and_ :: Foldable f => f (Expr Bool) -> Expr Bool
86and_ :: Foldable f => f (Expr Bool) -> Expr Bool
55and_ = foldl' (&&.) true
87and_ = foldl' (&&.) true
56
88
57
89
58-- | Fold @OR@ over a collection of expressions.
90-- | Fold @OR@ over a collection of expressions.
91+--
92+-- >>> select c $ pure $ or_ [ lit True ==. lit False, lit False, lit True ]
93+-- [True]
94+--
95+-- >>> select c $ pure $ or_ []
96+-- [False]
59or_ :: Foldable f => f (Expr Bool) -> Expr Bool
97or_ :: Foldable f => f (Expr Bool) -> Expr Bool
60or_ = foldl' (||.) false
98or_ = foldl' (||.) false
61
99
@@ -77,13 +115,9 @@ caseExpr :: [(Expr Bool, Expr a)] -> Expr a -> Expr a
77caseExpr branches (Expr fallback) =
115caseExpr branches (Expr fallback) =
78 Expr $ Opaleye.CaseExpr (map go branches) fallback
116 Expr $ Opaleye.CaseExpr (map go branches) fallback
79 where
117 where
80− go (condition, value) = (toPrimExpr condition, toPrimExpr value)
118+ go (Expr condition, Expr value) = (condition, value)
81
119
82
120
83−-- | Convert a @Expr (Maybe Bool)@ to a @Expr Bool@ by treating @Nothing@ as
84−-- @False@. This can be useful when combined with 'Rel8.where_', which expects
85−-- a @Bool@, and produces expressions that optimize better than general case
86−-- analysis.
87coalesce :: Expr (Maybe Bool) -> Expr Bool
121coalesce :: Expr (Maybe Bool) -> Expr Bool
88coalesce (Expr a) = Expr a &&. Expr (Opaleye.FunExpr "COALESCE" [a, untrue])
122coalesce (Expr a) = Expr a &&. Expr (Opaleye.FunExpr "COALESCE" [a, untrue])
89 where
123 where
src/Rel8/Expr/Default.hsdeleted−35
@@ -1,35 +0,0 @@
1−module Rel8.Expr.Default
2− ( unsafeDefault
3− )
4−where
5−
6−-- base
7−import Prelude ()
8−
9−-- opaleye
10−import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
11−
12−-- rel8
13−import Rel8.Expr ( Expr )
14−import Rel8.Expr.Opaleye ( fromPrimExpr )
15−
16−
17−-- | Corresponds to the SQL @DEFAULT@ expression.
18−--
19−-- This 'Expr' is unsafe for numerous reasons, and should be used with care:
20−--
21−-- 1. This 'Expr' only makes sense in an @INSERT@ or @UPDATE@ statement.
22−--
23−-- 2. Rel8 is not able to verify that a particular column actually has a
24−-- @DEFAULT@ value. Trying to use @unsafeDefault@ where there is no default
25−-- will cause a runtime crash
26−--
27−-- 3. @DEFAULT@ values can not be transformed. For example, the innocuous Rel8
28−-- code @unsafeDefault + 1@ will crash, despite type checking.
29−--
30−-- Given all these caveats, we suggest avoiding the use of default values where
31−-- possible, instead being explicit. A common scenario where default values are
32−-- used is with auto-incrementing identifier columns. In this case, we suggest
33−-- using 'Rel8.nextval' instead.
34−unsafeDefault :: Expr a
35−unsafeDefault = fromPrimExpr Opaleye.DefaultInsertExpr
src/Rel8/Expr/Eq.hs+35−15
@@ -1,5 +1,6 @@
1{-# language FlexibleContexts #-}
1{-# language FlexibleContexts #-}
2{-# language GADTs #-}
2{-# language GADTs #-}
3+{-# language LambdaCase #-}
3{-# language ScopedTypeVariables #-}
4{-# language ScopedTypeVariables #-}
4{-# language TypeApplications #-}
5{-# language TypeApplications #-}
5{-# language ViewPatterns #-}
6{-# language ViewPatterns #-}
@@ -24,9 +25,12 @@ import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
24-- rel8
25-- rel8
25import Rel8.Expr ( Expr )
26import Rel8.Expr ( Expr )
26import Rel8.Expr.Bool ( (&&.), (||.), false, or_, coalesce )
27import Rel8.Expr.Bool ( (&&.), (||.), false, or_, coalesce )
27−import Rel8.Expr.Null ( isNull, unsafeLiftOpNull )
28+import Rel8.Expr.Null ( isNull, unsafeLiftOpNullable )
28import Rel8.Expr.Opaleye ( fromPrimExpr, toPrimExpr, zipPrimExprsWith )
29import Rel8.Expr.Opaleye ( fromPrimExpr, toPrimExpr, zipPrimExprsWith )
29−import Rel8.Schema.Null ( Nullity( NotNull, Null ), Sql, nullable )
30+import Rel8.Schema.Nullability
31+ ( Nullability( NonNullable, Nullable )
32+ , Sql, nullabilization
33+ )
30import Rel8.Type.Eq ( DBEq )
34import Rel8.Type.Eq ( DBEq )
31
35
32
36
@@ -45,11 +49,10 @@ ne = zipPrimExprsWith (Opaleye.BinExpr (Opaleye.:<>))
45-- This operator matches Haskell's '==' operator. For an operator identical to
49-- This operator matches Haskell's '==' operator. For an operator identical to
46-- SQL @=@, see '==?'.
50-- SQL @=@, see '==?'.
47(==.) :: forall a. Sql DBEq a => Expr a -> Expr a -> Expr Bool
51(==.) :: forall a. Sql DBEq a => Expr a -> Expr a -> Expr Bool
48−(==.) = case nullable @a of
52+(==.) = case nullabilization @a of
49− Null -> \ma mb -> isNull ma &&. isNull mb ||. ma ==? mb
53+ Nullable -> \ma mb -> isNull ma &&. isNull mb ||. ma ==? mb
50− NotNull -> eq
54+ NonNullable -> eq
51infix 4 ==.
55infix 4 ==.
52−{-# INLINABLE (==.) #-}
53
56
54
57
55-- | Test if two expressions are different (not equal).
58-- | Test if two expressions are different (not equal).
@@ -59,11 +62,10 @@ infix 4 ==.
59-- which would return @null@. This operator is closer to Haskell's '=='
62-- which would return @null@. This operator is closer to Haskell's '=='
60-- operator. For an operator identical to SQL @=@, see '/=?'.
63-- operator. For an operator identical to SQL @=@, see '/=?'.
61(/=.) :: forall a. Sql DBEq a => Expr a -> Expr a -> Expr Bool
64(/=.) :: forall a. Sql DBEq a => Expr a -> Expr a -> Expr Bool
62−(/=.) = case nullable @a of
65+(/=.) = case nullabilization @a of
63− Null -> \ma mb -> isNull ma `ne` isNull mb ||. ma /=? mb
66+ Nullable -> \ma mb -> isNull ma `ne` isNull mb ||. ma /=? mb
64− NotNull -> ne
67+ NonNullable -> ne
65infix 4 /=.
68infix 4 /=.
66−{-# INLINABLE (/=.) #-}
67
69
68
70
69-- | Test if two expressions are equal. This operator is usually the best
71-- | Test if two expressions are equal. This operator is usually the best
@@ -72,8 +74,14 @@ infix 4 /=.
72--
74--
73-- This corresponds to the SQL @=@ operator, though it will always return a
75-- This corresponds to the SQL @=@ operator, though it will always return a
74-- 'Bool'.
76-- 'Bool'.
77+--
78+-- >>> select c $ pure $ lit Nothing ==? lit True
79+-- False
80+--
81+-- >>> select c $ pure $ lit Nothing ==? lit Nothing
82+-- False
75(==?) :: DBEq a => Expr (Maybe a) -> Expr (Maybe a) -> Expr Bool
83(==?) :: DBEq a => Expr (Maybe a) -> Expr (Maybe a) -> Expr Bool
76−a ==? b = coalesce $ unsafeLiftOpNull eq a b
84+a ==? b = coalesce $ unsafeLiftOpNullable eq a b
77infix 4 ==?
85infix 4 ==?
78
86
79
87
@@ -81,18 +89,30 @@ infix 4 ==?
81--
89--
82-- This corresponds to the SQL @<>@ operator, though it will always return a
90-- This corresponds to the SQL @<>@ operator, though it will always return a
83-- 'Bool'.
91-- 'Bool'.
92+--
93+-- >>> select c $ pure $ lit Nothing /=? lit True
94+-- True
95+--
96+-- >>> select c $ pure $ lit Nothing /=? lit Nothing
97+-- False
84(/=?) :: DBEq a => Expr (Maybe a) -> Expr (Maybe a) -> Expr Bool
98(/=?) :: DBEq a => Expr (Maybe a) -> Expr (Maybe a) -> Expr Bool
85−a /=? b = coalesce $ unsafeLiftOpNull ne a b
99+a /=? b = coalesce $ unsafeLiftOpNullable ne a b
86infix 4 /=?
100infix 4 /=?
87
101
88
102
89-- | Like the SQL @IN@ operator, but implemented by folding over a list with
103-- | Like the SQL @IN@ operator, but implemented by folding over a list with
90-- '==.' and '||.'.
104-- '==.' and '||.'.
105+--
106+-- >>> select c $ return $ lit (5 :: Int32) `in_` [ lit x | x <- [1..5] ]
107+-- [True]
108+--
109+-- >>> select c $ return $ lit (42 :: Int32) `in_` [ lit x | x <- [1..5] ]
110+-- [False]
91in_ :: forall a f. (Sql DBEq a, Foldable f)
111in_ :: forall a f. (Sql DBEq a, Foldable f)
92 => Expr a -> f (Expr a) -> Expr Bool
112 => Expr a -> f (Expr a) -> Expr Bool
93−in_ a (toList -> as) = case nullable @a of
113+in_ a (toList -> as) = case nullabilization @a of
94− Null -> or_ $ map (a ==.) as
114+ Nullable -> or_ $ map (a ==.) as
95− NotNull -> case nonEmpty as of
115+ NonNullable -> case nonEmpty as of
96 Nothing -> false
116 Nothing -> false
97 Just xs ->
117 Just xs ->
98 fromPrimExpr $
118 fromPrimExpr $
src/Rel8/Expr/Function.hs+33−2
@@ -20,12 +20,12 @@ import Prelude
20import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
20import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
21
21
22-- rel8
22-- rel8
23−import {-# SOURCE #-} Rel8.Expr ( Expr( Expr ) )
23+import Rel8.Expr ( Expr( Expr ) )
24import Rel8.Expr.Opaleye
24import Rel8.Expr.Opaleye
25 ( castExpr
25 ( castExpr
26 , fromPrimExpr, toPrimExpr, zipPrimExprsWith
26 , fromPrimExpr, toPrimExpr, zipPrimExprsWith
27 )
27 )
28−import Rel8.Schema.Null ( Sql )
28+import Rel8.Schema.Nullability ( Sql )
29import Rel8.Type ( DBType )
29import Rel8.Type ( DBType )
30
30
31
31
@@ -47,11 +47,42 @@ instance (arg ~ Expr a, Function args res) => Function arg (args -> res) where
47
47
48-- | Construct an n-ary function that produces an 'Expr' that when called runs
48-- | Construct an n-ary function that produces an 'Expr' that when called runs
49-- a SQL function.
49-- a SQL function.
50+--
51+-- For example, here's how we can wrap PostgreSQL's @factorial@ function:
52+--
53+-- >>> :{
54+-- factorial :: Expr Int64 -> Expr Data.Scientific.Scientific
55+-- factorial = function "factorial"
56+-- :}
57+--
58+-- >>> select c $ pure $ factorial 5
59+-- [120.0]
60+--
61+-- The same approach works for any number of arguments:
62+--
63+-- >>> :{
64+-- power :: Expr Float -> Expr Float -> Expr Double
65+-- power = function "power"
66+-- :}
67+--
68+-- >>> select c $ pure $ power 9 3
69+-- [729.0]
50function :: Function args result => String -> args -> result
70function :: Function args result => String -> args -> result
51function = applyArgument . Opaleye.FunExpr
71function = applyArgument . Opaleye.FunExpr
52
72
53
73
54-- | Construct a function call for functions with no arguments.
74-- | Construct a function call for functions with no arguments.
75+--
76+-- For example, we can call the database function @pi()@ by using
77+-- @nullaryFunction@:
78+--
79+-- >>> :{
80+-- sqlPi :: Expr Double
81+-- sqlPi = nullaryFunction "pi"
82+-- :}
83+--
84+-- >>> select c $ pure $ sqlPi
85+-- [3.141592653589793]
55nullaryFunction :: Sql DBType a => String -> Expr a
86nullaryFunction :: Sql DBType a => String -> Expr a
56nullaryFunction name = castExpr $ Expr (Opaleye.FunExpr name [])
87nullaryFunction name = castExpr $ Expr (Opaleye.FunExpr name [])
57
88
src/Rel8/Expr/Null.hs+31−20
@@ -5,11 +5,11 @@
5{-# options -fno-warn-redundant-constraints #-}
5{-# options -fno-warn-redundant-constraints #-}
6
6
7module Rel8.Expr.Null
7module Rel8.Expr.Null
8− ( null, snull, nullableExpr, nullableOf
8+ ( null, snull, nullable, nullableOf
9 , isNull, isNonNull
9 , isNull, isNonNull
10 , nullify, unsafeUnnullify
10 , nullify, unsafeUnnullify
11− , mapNull, liftOpNull
11+ , mapNullable, liftOpNullable
12− , unsafeMapNull, unsafeLiftOpNull
12+ , unsafeMapNullable, unsafeLiftOpNullable
13 )
13 )
14where
14where
15
15
@@ -23,7 +23,7 @@ import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
23import {-# SOURCE #-} Rel8.Expr ( Expr( Expr ) )
23import {-# SOURCE #-} Rel8.Expr ( Expr( Expr ) )
24import Rel8.Expr.Bool ( (||.), boolExpr )
24import Rel8.Expr.Bool ( (||.), boolExpr )
25import Rel8.Expr.Opaleye ( scastExpr, mapPrimExpr )
25import Rel8.Expr.Opaleye ( scastExpr, mapPrimExpr )
26−import Rel8.Schema.Null ( NotNull )
26+import Rel8.Schema.Nullability ( NotNull )
27import Rel8.Type ( DBType, typeInformation )
27import Rel8.Type ( DBType, typeInformation )
28import Rel8.Type.Information ( TypeInformation )
28import Rel8.Type.Information ( TypeInformation )
29
29
@@ -40,45 +40,56 @@ unsafeUnnullify (Expr a) = Expr a
40
40
41
41
42-- | Like 'maybe', but to eliminate @null@.
42-- | Like 'maybe', but to eliminate @null@.
43+--
44+-- >>> select c $ pure $ null 0 id (nullExpr :: Expr (Maybe Int32))
45+-- [0]
46+--
47+-- >>> select c $ pure $ null 0 id (lit (Just 42) :: Expr (Maybe Int32))
48+-- [42]
43−nullableExpr :: Expr b -> (Expr a -> Expr b) -> Expr (Maybe a) -> Expr b
49+nullable :: Expr b -> (Expr a -> Expr b) -> Expr (Maybe a) -> Expr b
44−nullableExpr b f ma = boolExpr (f (unsafeUnnullify ma)) b (isNull ma)
50+nullable b f ma = boolExpr (f (unsafeUnnullify ma)) b (isNull ma)
45
51
46
52
47nullableOf :: DBType a => Maybe (Expr a) -> Expr (Maybe a)
53nullableOf :: DBType a => Maybe (Expr a) -> Expr (Maybe a)
48nullableOf = maybe null nullify
54nullableOf = maybe null nullify
49
55
50
56
51−-- | Like 'Data.Maybe.isNothing', but for @null@.
57+-- | Like 'isNothing', but for @null@.
58+--
59+-- >>> select c $ pure $ isNull (nullExpr :: Expr (Maybe Int32))
60+-- [True]
61+--
62+-- >>> select c $ pure $ isNull (lit (Just 42) :: Expr (Maybe Int32))
63+-- [False]
52isNull :: Expr (Maybe a) -> Expr Bool
64isNull :: Expr (Maybe a) -> Expr Bool
53isNull = mapPrimExpr (Opaleye.UnExpr Opaleye.OpIsNull)
65isNull = mapPrimExpr (Opaleye.UnExpr Opaleye.OpIsNull)
54
66
55
67
56−-- | Like 'Data.Maybe.isJust', but for @null@.
68+-- | Like 'isJust', but for @null@.
57isNonNull :: Expr (Maybe a) -> Expr Bool
69isNonNull :: Expr (Maybe a) -> Expr Bool
58isNonNull = mapPrimExpr (Opaleye.UnExpr Opaleye.OpIsNotNull)
70isNonNull = mapPrimExpr (Opaleye.UnExpr Opaleye.OpIsNotNull)
59
71
60
72
61-- | Lift an operation on non-@null@ values to an operation on possibly @null@
73-- | Lift an operation on non-@null@ values to an operation on possibly @null@
62−-- values. When given @null@, @mapNull f@ returns @null@.
74+-- values. When given @null@, @mapNullable f@ returns @null@.
63--
75--
64-- This is like 'fmap' for 'Maybe'.
76-- This is like 'fmap' for 'Maybe'.
65−mapNull :: DBType b
77+mapNullable :: DBType b
66 => (Expr a -> Expr b) -> Expr (Maybe a) -> Expr (Maybe b)
78 => (Expr a -> Expr b) -> Expr (Maybe a) -> Expr (Maybe b)
67−mapNull f ma = boolExpr (unsafeMapNull f ma) null (isNull ma)
79+mapNullable f ma = boolExpr (unsafeMapNullable f ma) null (isNull ma)
68
80
69
81
70-- | Lift a binary operation on non-@null@ expressions to an equivalent binary
82-- | Lift a binary operation on non-@null@ expressions to an equivalent binary
71-- operator on possibly @null@ expressions. If either of the final arguments
83-- operator on possibly @null@ expressions. If either of the final arguments
72−-- are @null@, @liftOpNull@ returns @null@.
84+-- are @null@, @liftOpNullable@ returns @null@.
73--
85--
74-- This is like 'liftA2' for 'Maybe'.
86-- This is like 'liftA2' for 'Maybe'.
75−liftOpNull :: DBType c
87+liftOpNullable :: DBType c
76 => (Expr a -> Expr b -> Expr c)
88 => (Expr a -> Expr b -> Expr c)
77 -> Expr (Maybe a) -> Expr (Maybe b) -> Expr (Maybe c)
89 -> Expr (Maybe a) -> Expr (Maybe b) -> Expr (Maybe c)
78−liftOpNull f ma mb =
90+liftOpNullable f ma mb =
79− boolExpr (unsafeLiftOpNull f ma mb) null
91+ boolExpr (unsafeLiftOpNullable f ma mb) null
80 (isNull ma ||. isNull mb)
92 (isNull ma ||. isNull mb)
81−{-# INLINABLE liftOpNull #-}
82
93
83
94
84snull :: TypeInformation a -> Expr (Maybe a)
95snull :: TypeInformation a -> Expr (Maybe a)
@@ -90,13 +101,13 @@ null :: DBType a => Expr (Maybe a)
90null = snull typeInformation
101null = snull typeInformation
91
102
92
103
93−unsafeMapNull :: NotNull b
104+unsafeMapNullable :: NotNull b
94 => (Expr a -> Expr b) -> Expr (Maybe a) -> Expr (Maybe b)
105 => (Expr a -> Expr b) -> Expr (Maybe a) -> Expr (Maybe b)
95−unsafeMapNull f ma = nullify (f (unsafeUnnullify ma))
106+unsafeMapNullable f ma = nullify (f (unsafeUnnullify ma))
96
107
97
108
98−unsafeLiftOpNull :: NotNull c
109+unsafeLiftOpNullable :: NotNull c
99 => (Expr a -> Expr b -> Expr c)
110 => (Expr a -> Expr b -> Expr c)
100 -> Expr (Maybe a) -> Expr (Maybe b) -> Expr (Maybe c)
111 -> Expr (Maybe a) -> Expr (Maybe b) -> Expr (Maybe c)
101−unsafeLiftOpNull f ma mb =
112+unsafeLiftOpNullable f ma mb =
102 nullify (f (unsafeUnnullify ma) (unsafeUnnullify mb))
113 nullify (f (unsafeUnnullify ma) (unsafeUnnullify mb))
src/Rel8/Expr/Num.hs+9−62
@@ -4,107 +4,54 @@
4{-# options_ghc -fno-warn-redundant-constraints #-}
4{-# options_ghc -fno-warn-redundant-constraints #-}
5
5
6module Rel8.Expr.Num
6module Rel8.Expr.Num
7− ( fromIntegral
8− , realToFrac
9− , div, mod, divMod
10− , quot, rem, quotRem
11− , ceiling, floor, round, truncate
7+ ( fromIntegral, realToFrac, div, mod, ceiling, floor, round, truncate
12 )
8 )
13where
9where
14
10
15-- base
11-- base
16−import Prelude ( (+), (-), fst, negate, signum, snd )
12+import Prelude ()
17
13
18-- rel
14-- rel
19import Rel8.Expr ( Expr( Expr ) )
15import Rel8.Expr ( Expr( Expr ) )
20−import Rel8.Expr.Eq ( (==.) )
21import Rel8.Expr.Function ( function )
16import Rel8.Expr.Function ( function )
22import Rel8.Expr.Opaleye ( castExpr )
17import Rel8.Expr.Opaleye ( castExpr )
23−import Rel8.Schema.Null ( Homonullable, Sql )
18+import Rel8.Schema.Nullability ( Homonullable, Sql )
24−import Rel8.Table.Bool ( bool )
25import Rel8.Type.Num ( DBFractional, DBIntegral, DBNum )
19import Rel8.Type.Num ( DBFractional, DBIntegral, DBNum )
26
20
27
21
28−-- | Cast 'DBIntegral' types to 'DBNum' types. For example, this can be useful
29−-- if you need to turn an @Expr Int32@ into an @Expr Double@.
30fromIntegral :: (Sql DBIntegral a, Sql DBNum b, Homonullable a b)
22fromIntegral :: (Sql DBIntegral a, Sql DBNum b, Homonullable a b)
31 => Expr a -> Expr b
23 => Expr a -> Expr b
32fromIntegral (Expr a) = castExpr (Expr a)
24fromIntegral (Expr a) = castExpr (Expr a)
33
25
34
26
35−-- | Cast 'DBNum' types to 'DBFractional' types. For example, his can be useful
36−-- to convert @Expr Float@ to @Expr Double@.
37realToFrac :: (Sql DBNum a, Sql DBFractional b, Homonullable a b)
27realToFrac :: (Sql DBNum a, Sql DBFractional b, Homonullable a b)
38 => Expr a -> Expr b
28 => Expr a -> Expr b
39realToFrac (Expr a) = castExpr (Expr a)
29realToFrac (Expr a) = castExpr (Expr a)
40
30
41
31
42−-- | Round a 'DBFractional' to a 'DBIntegral' by rounding to the nearest larger
43−-- integer.
44−--
45−-- Corresponds to the @ceiling()@ function.
46ceiling :: (Sql DBFractional a, Sql DBIntegral b, Homonullable a b)
32ceiling :: (Sql DBFractional a, Sql DBIntegral b, Homonullable a b)
47 => Expr a -> Expr b
33 => Expr a -> Expr b
48−ceiling = function "ceiling"
34+ceiling = function "CEILING"
49
35
50
36
51−-- | Emulates the behaviour of the Haskell function 'Prelude.div' in
52−-- PostgreSQL.
53div :: Sql DBIntegral a => Expr a -> Expr a -> Expr a
37div :: Sql DBIntegral a => Expr a -> Expr a -> Expr a
54−div n d = fst (divMod n d)
38+div = function "DIV"
55
39
56
40
57−-- | Emulates the behaviour of the Haskell function 'Prelude.mod' in
58−-- PostgreSQL.
59mod :: Sql DBIntegral a => Expr a -> Expr a -> Expr a
41mod :: Sql DBIntegral a => Expr a -> Expr a -> Expr a
60−mod n d = snd (divMod n d)
42+mod = function "MOD"
61
43
62
44
63−-- | Simultaneous 'div' and 'mod'.
64−divMod :: Sql DBIntegral a => Expr a -> Expr a -> (Expr a, Expr a)
65−divMod n d = bool qr (q - 1, r + d) (signum r ==. negate (signum d))
66− where
67− qr@(q, r) = quotRem n d
68−
69−
70−-- | Perform integral division. Corresponds to the @div()@ function in
71−-- PostgreSQL, which behaves like Haskell's 'Prelude.quot' rather than
72−-- 'Prelude.div'.
73−quot :: Sql DBIntegral a => Expr a -> Expr a -> Expr a
74−quot = function "div"
75−
76−
77−-- | Corresponds to the @mod()@ function in PostgreSQL, which behaves like
78−-- Haskell's 'Prelude.rem' rather than 'Prelude.mod'.
79−rem :: Sql DBIntegral a => Expr a -> Expr a -> Expr a
80−rem = function "mod"
81−
82−
83−-- | Simultaneous 'quot' and 'rem'.
84−quotRem :: Sql DBIntegral a => Expr a -> Expr a -> (Expr a, Expr a)
85−quotRem n d = (quot n d, rem n d)
86−
87−
88−-- | Round a 'DFractional' to a 'DBIntegral' by rounding to the nearest smaller
89−-- integer.
90−--
91−-- Corresponds to the @floor()@ function.
92floor :: (Sql DBFractional a, Sql DBIntegral b, Homonullable a b)
45floor :: (Sql DBFractional a, Sql DBIntegral b, Homonullable a b)
93 => Expr a -> Expr b
46 => Expr a -> Expr b
94−floor = function "floor"
47+floor = function "FLOOR"
95
48
96
49
97−-- | Round a 'DBFractional' to a 'DBIntegral' by rounding to the nearest
98−-- integer.
99−--
100−-- Corresponds to the @round()@ function.
101round :: (Sql DBFractional a, Sql DBIntegral b, Homonullable a b)
50round :: (Sql DBFractional a, Sql DBIntegral b, Homonullable a b)
102 => Expr a -> Expr b
51 => Expr a -> Expr b
103−round = function "round"
52+round = function "ROUND"
104
53
105
54
106−-- | Round a 'DBFractional' to a 'DBIntegral' by rounding to the nearest
107−-- integer towards zero.
108truncate :: (Sql DBFractional a, Sql DBIntegral b, Homonullable a b)
55truncate :: (Sql DBFractional a, Sql DBIntegral b, Homonullable a b)
109 => Expr a -> Expr b
56 => Expr a -> Expr b
110−truncate = function "trunc"
57+truncate = function "TRUNC"
src/Rel8/Expr/Opaleye.hs+8−22
@@ -1,6 +1,8 @@
1{-# language FlexibleContexts #-}
1{-# language FlexibleContexts #-}
2+{-# language LambdaCase #-}
2{-# language NamedFieldPuns #-}
3{-# language NamedFieldPuns #-}
3{-# language ScopedTypeVariables #-}
4{-# language ScopedTypeVariables #-}
5+{-# language TypeApplications #-}
4{-# language TypeFamilies #-}
6{-# language TypeFamilies #-}
5
7
6{-# options_ghc -fno-warn-redundant-constraints #-}
8{-# options_ghc -fno-warn-redundant-constraints #-}
@@ -10,7 +12,7 @@ module Rel8.Expr.Opaleye
10 , scastExpr, sunsafeCastExpr
12 , scastExpr, sunsafeCastExpr
11 , unsafeLiteral
13 , unsafeLiteral
12 , fromPrimExpr, toPrimExpr, mapPrimExpr, zipPrimExprsWith, traversePrimExpr
14 , fromPrimExpr, toPrimExpr, mapPrimExpr, zipPrimExprsWith, traversePrimExpr
13− , toColumn, fromColumn, traverseFieldP
15+ , toColumn, fromColumn
14 )
16 )
15where
17where
16
18
@@ -23,20 +25,15 @@ import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
23
25
24-- rel8
26-- rel8
25import {-# SOURCE #-} Rel8.Expr ( Expr( Expr ) )
27import {-# SOURCE #-} Rel8.Expr ( Expr( Expr ) )
26−import Rel8.Schema.Null ( Unnullify, Sql )
28+import Rel8.Schema.Nullability ( Unnullify, Sql )
27import Rel8.Type ( DBType, typeInformation )
29import Rel8.Type ( DBType, typeInformation )
28import Rel8.Type.Information ( TypeInformation(..) )
30import Rel8.Type.Information ( TypeInformation(..) )
29
31
30−-- profunctors
31−import Data.Profunctor ( Profunctor, dimap )
32−
33
32
34castExpr :: Sql DBType a => Expr a -> Expr a
33castExpr :: Sql DBType a => Expr a -> Expr a
35castExpr = scastExpr typeInformation
34castExpr = scastExpr typeInformation
36
35
37
36
38−-- | Cast an expression to a different type. Corresponds to a @CAST()@ function
39−-- call.
40unsafeCastExpr :: Sql DBType b => Expr a -> Expr b
37unsafeCastExpr :: Sql DBType b => Expr a -> Expr b
41unsafeCastExpr = sunsafeCastExpr typeInformation
38unsafeCastExpr = sunsafeCastExpr typeInformation
42
39
@@ -51,13 +48,8 @@ sunsafeCastExpr TypeInformation {typeName} =
51 fromPrimExpr . Opaleye.CastExpr typeName . toPrimExpr
48 fromPrimExpr . Opaleye.CastExpr typeName . toPrimExpr
52
49
53
50
54−-- | Unsafely construct an expression from literal SQL.
55−--
56−-- This is an escape hatch, and can be used if Rel8 can not adequately express
57−-- the query you need. If you find yourself using this function, please let us
58−-- know, as it may indicate that something is missing from Rel8!
59−unsafeLiteral :: String -> Expr a
51+unsafeLiteral :: Sql DBType a => String -> Expr a
60−unsafeLiteral = Expr . Opaleye.ConstExpr . Opaleye.OtherLit
52+unsafeLiteral = castExpr . Expr . Opaleye.ConstExpr . Opaleye.OtherLit
61
53
62
54
63fromPrimExpr :: Opaleye.PrimExpr -> Expr a
55fromPrimExpr :: Opaleye.PrimExpr -> Expr a
@@ -83,15 +75,9 @@ traversePrimExpr :: Functor f
83traversePrimExpr f = fmap fromPrimExpr . f . toPrimExpr
75traversePrimExpr f = fmap fromPrimExpr . f . toPrimExpr
84
76
85
77
86−traverseFieldP :: Profunctor p
87− => p (Opaleye.Field_ n x) (Opaleye.Field_ m y)
88− -> p (Expr a) (Expr b)
89−traverseFieldP = dimap (toColumn . toPrimExpr) (fromPrimExpr . fromColumn)
90−
91−
92−toColumn :: Opaleye.PrimExpr -> Opaleye.Field_ n b
78+toColumn :: Opaleye.PrimExpr -> Opaleye.Column b
93toColumn = Opaleye.Column
79toColumn = Opaleye.Column
94
80
95
81
96−fromColumn :: Opaleye.Field_ n b -> Opaleye.PrimExpr
82+fromColumn :: Opaleye.Column b -> Opaleye.PrimExpr
97fromColumn (Opaleye.Column a) = a
83fromColumn (Opaleye.Column a) = a
src/Rel8/Expr/Ord.hs+31−28
@@ -1,5 +1,6 @@
1{-# language DataKinds #-}
1{-# language DataKinds #-}
2{-# language FlexibleContexts #-}
2{-# language FlexibleContexts #-}
3+{-# language LambdaCase #-}
3{-# language GADTs #-}
4{-# language GADTs #-}
4{-# language ScopedTypeVariables #-}
5{-# language ScopedTypeVariables #-}
5{-# language TypeApplications #-}
6{-# language TypeApplications #-}
@@ -22,9 +23,12 @@ import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
22-- rel8
23-- rel8
23import Rel8.Expr ( Expr( Expr ) )
24import Rel8.Expr ( Expr( Expr ) )
24import Rel8.Expr.Bool ( (&&.), (||.), coalesce )
25import Rel8.Expr.Bool ( (&&.), (||.), coalesce )
25−import Rel8.Expr.Null ( isNull, isNonNull, nullableExpr, unsafeLiftOpNull )
26+import Rel8.Expr.Null ( isNull, isNonNull, nullable, unsafeLiftOpNullable )
26−import Rel8.Expr.Opaleye ( toPrimExpr, zipPrimExprsWith )
27+import Rel8.Expr.Opaleye ( zipPrimExprsWith )
27−import Rel8.Schema.Null ( Nullity( Null, NotNull ), Sql, nullable )
28+import Rel8.Schema.Nullability
29+ ( Nullability( NonNullable, Nullable )
30+ , Sql, nullabilization
31+ )
28import Rel8.Type.Ord ( DBOrd )
32import Rel8.Type.Ord ( DBOrd )
29
33
30
34
@@ -48,9 +52,9 @@ ge = zipPrimExprsWith (Opaleye.BinExpr (Opaleye.:>=))
48-- as @null@ will sort below any other value. For a version of @<@ that exactly
52-- as @null@ will sort below any other value. For a version of @<@ that exactly
49-- matches SQL, see '(<?)'.
53-- matches SQL, see '(<?)'.
50(<.) :: forall a. Sql DBOrd a => Expr a -> Expr a -> Expr Bool
54(<.) :: forall a. Sql DBOrd a => Expr a -> Expr a -> Expr Bool
51−(<.) = case nullable @a of
55+(<.) = case nullabilization @a of
52− Null -> \ma mb -> isNull ma &&. isNonNull mb ||. ma <? mb
56+ Nullable -> \ma mb -> isNull ma &&. isNonNull mb ||. ma <? mb
53− NotNull -> lt
57+ NonNullable -> lt
54infix 4 <.
58infix 4 <.
55
59
56
60
@@ -58,9 +62,9 @@ infix 4 <.
58-- as @null@ will sort below any other value. For a version of @<=@ that exactly
62-- as @null@ will sort below any other value. For a version of @<=@ that exactly
59-- matches SQL, see '(<=?)'.
63-- matches SQL, see '(<=?)'.
60(<=.) :: forall a. Sql DBOrd a => Expr a -> Expr a -> Expr Bool
64(<=.) :: forall a. Sql DBOrd a => Expr a -> Expr a -> Expr Bool
61−(<=.) = case nullable @a of
65+(<=.) = case nullabilization @a of
62− Null -> \ma mb -> isNull ma ||. ma <=? mb
66+ Nullable -> \ma mb -> isNull ma ||. ma <=? mb
63− NotNull -> le
67+ NonNullable -> le
64infix 4 <=.
68infix 4 <=.
65
69
66
70
@@ -68,9 +72,9 @@ infix 4 <=.
68-- as @null@ will sort below any other value. For a version of @>@ that exactly
72-- as @null@ will sort below any other value. For a version of @>@ that exactly
69-- matches SQL, see '(>?)'.
73-- matches SQL, see '(>?)'.
70(>.) :: forall a. Sql DBOrd a => Expr a -> Expr a -> Expr Bool
74(>.) :: forall a. Sql DBOrd a => Expr a -> Expr a -> Expr Bool
71−(>.) = case nullable @a of
75+(>.) = case nullabilization @a of
72− Null -> \ma mb -> isNonNull ma &&. isNull mb ||. ma >? mb
76+ Nullable -> \ma mb -> isNonNull ma &&. isNull mb ||. ma >? mb
73− NotNull -> gt
77+ NonNullable -> gt
74infix 4 >.
78infix 4 >.
75
79
76
80
@@ -78,37 +82,37 @@ infix 4 >.
78-- as @null@ will sort below any other value. For a version of @>=@ that
82-- as @null@ will sort below any other value. For a version of @>=@ that
79-- exactly matches SQL, see '(>=?)'.
83-- exactly matches SQL, see '(>=?)'.
80(>=.) :: forall a. Sql DBOrd a => Expr a -> Expr a -> Expr Bool
84(>=.) :: forall a. Sql DBOrd a => Expr a -> Expr a -> Expr Bool
81−(>=.) = case nullable @a of
85+(>=.) = case nullabilization @a of
82− Null -> \ma mb -> isNull mb ||. ma >=? mb
86+ Nullable -> \ma mb -> isNull mb ||. ma >=? mb
83− NotNull -> ge
87+ NonNullable -> ge
84infix 4 >=.
88infix 4 >=.
85
89
86
90
87-- | Corresponds to the SQL @<@ operator. Returns @null@ if either arguments
91-- | Corresponds to the SQL @<@ operator. Returns @null@ if either arguments
88-- are @null@.
92-- are @null@.
89(<?) :: DBOrd a => Expr (Maybe a) -> Expr (Maybe a) -> Expr Bool
93(<?) :: DBOrd a => Expr (Maybe a) -> Expr (Maybe a) -> Expr Bool
90−a <? b = coalesce $ unsafeLiftOpNull lt a b
94+a <? b = coalesce $ unsafeLiftOpNullable lt a b
91infix 4 <?
95infix 4 <?
92
96
93
97
94-- | Corresponds to the SQL @<=@ operator. Returns @null@ if either arguments
98-- | Corresponds to the SQL @<=@ operator. Returns @null@ if either arguments
95-- are @null@.
99-- are @null@.
96(<=?) :: DBOrd a => Expr (Maybe a) -> Expr (Maybe a) -> Expr Bool
100(<=?) :: DBOrd a => Expr (Maybe a) -> Expr (Maybe a) -> Expr Bool
97−a <=? b = coalesce $ unsafeLiftOpNull le a b
101+a <=? b = coalesce $ unsafeLiftOpNullable le a b
98infix 4 <=?
102infix 4 <=?
99
103
100
104
101-- | Corresponds to the SQL @>@ operator. Returns @null@ if either arguments
105-- | Corresponds to the SQL @>@ operator. Returns @null@ if either arguments
102-- are @null@.
106-- are @null@.
103(>?) :: DBOrd a => Expr (Maybe a) -> Expr (Maybe a) -> Expr Bool
107(>?) :: DBOrd a => Expr (Maybe a) -> Expr (Maybe a) -> Expr Bool
104−a >? b = coalesce $ unsafeLiftOpNull gt a b
108+a >? b = coalesce $ unsafeLiftOpNullable gt a b
105infix 4 >?
109infix 4 >?
106
110
107
111
108-- | Corresponds to the SQL @>=@ operator. Returns @null@ if either arguments
112-- | Corresponds to the SQL @>=@ operator. Returns @null@ if either arguments
109-- are @null@.
113-- are @null@.
110(>=?) :: DBOrd a => Expr (Maybe a) -> Expr (Maybe a) -> Expr Bool
114(>=?) :: DBOrd a => Expr (Maybe a) -> Expr (Maybe a) -> Expr Bool
111−a >=? b = coalesce $ unsafeLiftOpNull ge a b
115+a >=? b = coalesce $ unsafeLiftOpNullable ge a b
112infix 4 >=?
116infix 4 >=?
113
117
114
118
@@ -117,11 +121,11 @@ infix 4 >=?
117--
121--
118-- Corresponds to the SQL @least()@ function.
122-- Corresponds to the SQL @least()@ function.
119leastExpr :: forall a. Sql DBOrd a => Expr a -> Expr a -> Expr a
123leastExpr :: forall a. Sql DBOrd a => Expr a -> Expr a -> Expr a
120−leastExpr ma mb = case nullable @a of
124+leastExpr ma mb = case nullabilization @a of
121− Null -> nullableExpr ma (\a -> nullableExpr mb (least_ a) mb) ma
125+ Nullable -> nullable ma (\a -> nullable mb (least_ a) mb) ma
122− NotNull -> least_ ma mb
126+ NonNullable -> least_ ma mb
123 where
127 where
124− least_ a b = Expr (Opaleye.FunExpr "LEAST" [toPrimExpr a, toPrimExpr b])
128+ least_ (Expr a) (Expr b) = Expr (Opaleye.FunExpr "LEAST" [a, b])
125
129
126
130
127-- | Given two expressions, return the expression that sorts greater than the
131-- | Given two expressions, return the expression that sorts greater than the
@@ -129,9 +133,8 @@ leastExpr ma mb = case nullable @a of
129--
133--
130-- Corresponds to the SQL @greatest()@ function.
134-- Corresponds to the SQL @greatest()@ function.
131greatestExpr :: forall a. Sql DBOrd a => Expr a -> Expr a -> Expr a
135greatestExpr :: forall a. Sql DBOrd a => Expr a -> Expr a -> Expr a
132−greatestExpr ma mb = case nullable @a of
136+greatestExpr ma mb = case nullabilization @a of
133− Null -> nullableExpr mb (\a -> nullableExpr ma (greatest_ a) mb) ma
137+ Nullable -> nullable mb (\a -> nullable ma (greatest_ a) mb) ma
134− NotNull -> greatest_ ma mb
138+ NonNullable -> greatest_ ma mb
135 where
139 where
136− greatest_ a b =
137− Expr (Opaleye.FunExpr "GREATEST" [toPrimExpr a, toPrimExpr b])
140+ greatest_ (Expr a) (Expr b) = Expr (Opaleye.FunExpr "GREATEST" [a, b])
src/Rel8/Expr/Order.hs+12
@@ -28,6 +28,9 @@ import Rel8.Type.Ord ( DBOrd )
28
28
29
29
30-- | Sort a column in ascending order.
30-- | Sort a column in ascending order.
31+--
32+-- >>> select c $ orderBy asc $ values [ lit x | x <- [1..5 :: Int32] ]
33+-- [1,2,3,4,5]
31asc :: DBOrd a => Order (Expr a)
34asc :: DBOrd a => Order (Expr a)
32asc = Order $ Opaleye.Order (\expr -> [(orderOp, toPrimExpr expr)])
35asc = Order $ Opaleye.Order (\expr -> [(orderOp, toPrimExpr expr)])
33 where
36 where
@@ -39,6 +42,9 @@ asc = Order $ Opaleye.Order (\expr -> [(orderOp, toPrimExpr expr)])
39
42
40
43
41-- | Sort a column in descending order.
44-- | Sort a column in descending order.
45+--
46+-- >>> select c $ orderBy desc $ values [ lit x | x <- [1..5 :: Int32] ]
47+-- [5,4,3,2,1]
42desc :: DBOrd a => Order (Expr a)
48desc :: DBOrd a => Order (Expr a)
43desc = Order $ Opaleye.Order (\expr -> [(orderOp, toPrimExpr expr)])
49desc = Order $ Opaleye.Order (\expr -> [(orderOp, toPrimExpr expr)])
44 where
50 where
@@ -51,6 +57,9 @@ desc = Order $ Opaleye.Order (\expr -> [(orderOp, toPrimExpr expr)])
51
57
52-- | Transform an ordering so that @null@ values appear first. This corresponds
58-- | Transform an ordering so that @null@ values appear first. This corresponds
53-- to @NULLS FIRST@ in SQL.
59-- to @NULLS FIRST@ in SQL.
60+--
61+-- >>> select c $ orderBy (nullsFirst desc) $ values $ [ nullExpr, nullExpr ] <> [ lit (Just x) | x <- [1..5 :: Int32] ]
62+-- [Nothing,Nothing,Just 5,Just 4,Just 3,Just 2,Just 1]
54nullsFirst :: Order (Expr a) -> Order (Expr (Maybe a))
63nullsFirst :: Order (Expr a) -> Order (Expr (Maybe a))
55nullsFirst (Order (Opaleye.Order f)) =
64nullsFirst (Order (Opaleye.Order f)) =
56 Order $ Opaleye.Order $ fmap (first g) . f . unsafeUnnullify
65 Order $ Opaleye.Order $ fmap (first g) . f . unsafeUnnullify
@@ -61,6 +70,9 @@ nullsFirst (Order (Opaleye.Order f)) =
61
70
62-- | Transform an ordering so that @null@ values appear first. This corresponds
71-- | Transform an ordering so that @null@ values appear first. This corresponds
63-- to @NULLS LAST@ in SQL.
72-- to @NULLS LAST@ in SQL.
73+--
74+-- >>> select c $ orderBy (nullsLast desc) $ values $ [ nullExpr, nullExpr ] <> [ lit (Just x) | x <- [1..5 :: Int32] ]
75+-- [Just 5,Just 4,Just 3,Just 2,Just 1,Nothing,Nothing]
64nullsLast :: Order (Expr a) -> Order (Expr (Maybe a))
76nullsLast :: Order (Expr a) -> Order (Expr (Maybe a))
65nullsLast (Order (Opaleye.Order f)) =
77nullsLast (Order (Opaleye.Order f)) =
66 Order $ Opaleye.Order $ fmap (first g) . f . unsafeUnnullify
78 Order $ Opaleye.Order $ fmap (first g) . f . unsafeUnnullify
src/Rel8/Expr/Sequence.hsdeleted−22
@@ -1,22 +0,0 @@
1−module Rel8.Expr.Sequence
2− ( nextval
3− )
4−where
5−
6−-- base
7−import Data.Int ( Int64 )
8−import Prelude
9−
10−-- rel8
11−import Rel8.Expr ( Expr )
12−import Rel8.Expr.Function ( function )
13−import Rel8.Expr.Serialize ( litExpr )
14−import Rel8.Expr.Text ( quoteIdent )
15−
16−-- text
17−import Data.Text ( pack )
18−
19−
20−-- | See https://www.postgresql.org/docs/current/functions-sequence.html
21−nextval :: String -> Expr Int64
22−nextval = function "nextval" . quoteIdent . litExpr . pack
src/Rel8/Expr/Serialize.hs+15−15
@@ -21,29 +21,29 @@ import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
21-- rel8
21-- rel8
22import {-# SOURCE #-} Rel8.Expr ( Expr( Expr ) )
22import {-# SOURCE #-} Rel8.Expr ( Expr( Expr ) )
23import Rel8.Expr.Opaleye ( scastExpr )
23import Rel8.Expr.Opaleye ( scastExpr )
24−import Rel8.Schema.Null ( Unnullify, Nullity( Null, NotNull ), Sql, nullable )
24+import Rel8.Schema.Nullability
25+ ( Unnullify
26+ , Nullability( Nullable, NonNullable )
27+ , Sql, nullabilization
28+ )
25import Rel8.Type ( DBType, typeInformation )
29import Rel8.Type ( DBType, typeInformation )
26import Rel8.Type.Information ( TypeInformation(..) )
30import Rel8.Type.Information ( TypeInformation(..) )
27
31
28
32
29−-- | Produce an expression from a literal.
30−--
31−-- Note that you can usually use 'Rel8.lit', but @litExpr@ can solve problems
32−-- of inference in polymorphic code.
33litExpr :: Sql DBType a => a -> Expr a
33litExpr :: Sql DBType a => a -> Expr a
34−litExpr = slitExpr nullable typeInformation
34+litExpr = slitExpr nullabilization typeInformation
35
35
36
36
37−slitExpr :: Nullity a -> TypeInformation (Unnullify a) -> a -> Expr a
37+slitExpr :: Nullability a -> TypeInformation (Unnullify a) -> a -> Expr a
38−slitExpr nullity info@TypeInformation {encode} =
38+slitExpr nullability info@TypeInformation {encode} =
39 scastExpr info . Expr . encoder
39 scastExpr info . Expr . encoder
40 where
40 where
41− encoder = case nullity of
41+ encoder = case nullability of
42− Null -> maybe (Opaleye.ConstExpr Opaleye.NullLit) encode
42+ Nullable -> maybe (Opaleye.ConstExpr Opaleye.NullLit) encode
43− NotNull -> encode
43+ NonNullable -> encode
44
44
45
45
46−sparseValue :: Nullity a -> TypeInformation (Unnullify a) -> Hasql.Row a
46+sparseValue :: Nullability a -> TypeInformation (Unnullify a) -> Hasql.Row a
47−sparseValue nullity TypeInformation {decode} = case nullity of
47+sparseValue nullability TypeInformation {decode, out} = case nullability of
48− Null -> Hasql.column $ Hasql.nullable decode
48+ Nullable -> Hasql.column $ Hasql.nullable $ out <$> decode
49− NotNull -> Hasql.column $ Hasql.nonNullable decode
49+ NonNullable -> Hasql.column $ Hasql.nonNullable $ out <$> decode
src/Rel8/Expr/Text.hs+11−66
@@ -16,10 +16,7 @@ module Rel8.Expr.Text
16 , initcap, left, length, lengthEncoding, lpad, ltrim, md5
16 , initcap, left, length, lengthEncoding, lpad, ltrim, md5
17 , pgClientEncoding, quoteIdent, quoteLiteral, quoteNullable, regexpReplace
17 , pgClientEncoding, quoteIdent, quoteLiteral, quoteNullable, regexpReplace
18 , regexpSplitToArray, repeat, replace, reverse, right, rpad, rtrim
18 , regexpSplitToArray, repeat, replace, reverse, right, rpad, rtrim
19− , splitPart, strpos, substr, translate
19+ , splitPart, strpos, substr, toAscii, toHex, translate
20−
21− -- * @LIKE@ and @ILIKE@
22− , like, ilike
23 )
20 )
24where
21where
25
22
@@ -27,7 +24,7 @@ where
27import Data.Bool ( Bool )
24import Data.Bool ( Bool )
28import Data.Int ( Int32 )
25import Data.Int ( Int32 )
29import Data.Maybe ( Maybe( Nothing, Just ) )
26import Data.Maybe ( Maybe( Nothing, Just ) )
30−import Prelude ( flip )
27+import Prelude ()
31
28
32-- bytestring
29-- bytestring
33import Data.ByteString ( ByteString )
30import Data.ByteString ( ByteString )
@@ -35,6 +32,7 @@ import Data.ByteString ( ByteString )
35-- rel8
32-- rel8
36import Rel8.Expr ( Expr )
33import Rel8.Expr ( Expr )
37import Rel8.Expr.Function ( binaryOperator, function, nullaryFunction )
34import Rel8.Expr.Function ( binaryOperator, function, nullaryFunction )
35+import Rel8.Type.Array1D ( Array1D )
38
36
39-- text
37-- text
40import Data.Text (Text)
38import Data.Text (Text)
@@ -52,32 +50,24 @@ infixr 6 ++.
52
50
53
51
54-- | Matches regular expression, case sensitive
52-- | Matches regular expression, case sensitive
55−--
56−-- Corresponds to the @~.@ operator.
57(~.) :: Expr Text -> Expr Text -> Expr Bool
53(~.) :: Expr Text -> Expr Text -> Expr Bool
58(~.) = binaryOperator "~."
54(~.) = binaryOperator "~."
59infix 2 ~.
55infix 2 ~.
60
56
61
57
62-- | Matches regular expression, case insensitive
58-- | Matches regular expression, case insensitive
63−--
64−-- Corresponds to the @~*@ operator.
65(~*) :: Expr Text -> Expr Text -> Expr Bool
59(~*) :: Expr Text -> Expr Text -> Expr Bool
66(~*) = binaryOperator "~*"
60(~*) = binaryOperator "~*"
67infix 2 ~*
61infix 2 ~*
68
62
69
63
70-- | Does not match regular expression, case sensitive
64-- | Does not match regular expression, case sensitive
71−--
72−-- Corresponds to the @!~@ operator.
73(!~) :: Expr Text -> Expr Text -> Expr Bool
65(!~) :: Expr Text -> Expr Text -> Expr Bool
74(!~) = binaryOperator "!~"
66(!~) = binaryOperator "!~"
75infix 2 !~
67infix 2 !~
76
68
77
69
78-- | Does not match regular expression, case insensitive
70-- | Does not match regular expression, case insensitive
79−--
80−-- Corresponds to the @!~*@ operator.
81(!~*) :: Expr Text -> Expr Text -> Expr Bool
71(!~*) :: Expr Text -> Expr Text -> Expr Bool
82(!~*) = binaryOperator "!~*"
72(!~*) = binaryOperator "!~*"
83infix 2 !~*
73infix 2 !~*
@@ -88,209 +78,164 @@ infix 2 !~*
88-- * Standard SQL functions
78-- * Standard SQL functions
89
79
90
80
91−-- | Corresponds to the @bit_length@ function.
92bitLength :: Expr Text -> Expr Int32
81bitLength :: Expr Text -> Expr Int32
93bitLength = function "bit_length"
82bitLength = function "bit_length"
94
83
95
84
96−-- | Corresponds to the @char_length@ function.
97charLength :: Expr Text -> Expr Int32
85charLength :: Expr Text -> Expr Int32
98charLength = function "char_length"
86charLength = function "char_length"
99
87
100
88
101−-- | Corresponds to the @lower@ function.
102lower :: Expr Text -> Expr Text
89lower :: Expr Text -> Expr Text
103lower = function "lower"
90lower = function "lower"
104
91
105
92
106−-- | Corresponds to the @octet_length@ function.
107octetLength :: Expr Text -> Expr Int32
93octetLength :: Expr Text -> Expr Int32
108octetLength = function "octet_length"
94octetLength = function "octet_length"
109
95
110
96
111−-- | Corresponds to the @upper@ function.
112upper :: Expr Text -> Expr Text
97upper :: Expr Text -> Expr Text
113upper = function "upper"
98upper = function "upper"
114
99
115
100
116−-- | Corresponds to the @ascii@ function.
101+-- * PostgreSQL functions
117ascii :: Expr Text -> Expr Int32
102ascii :: Expr Text -> Expr Int32
118ascii = function "ascii"
103ascii = function "ascii"
119
104
120
105
121−-- | Corresponds to the @btrim@ function.
122btrim :: Expr Text -> Maybe (Expr Text) -> Expr Text
106btrim :: Expr Text -> Maybe (Expr Text) -> Expr Text
123btrim a (Just b) = function "btrim" a b
107btrim a (Just b) = function "btrim" a b
124btrim a Nothing = function "btrim" a
108btrim a Nothing = function "btrim" a
125
109
126
110
127−-- | Corresponds to the @chr@ function.
128chr :: Expr Int32 -> Expr Text
111chr :: Expr Int32 -> Expr Text
129chr = function "chr"
112chr = function "chr"
130
113
131
114
132−-- | Corresponds to the @convert@ function.
133convert :: Expr ByteString -> Expr Text -> Expr Text -> Expr ByteString
115convert :: Expr ByteString -> Expr Text -> Expr Text -> Expr ByteString
134convert = function "convert"
116convert = function "convert"
135
117
136
118
137−-- | Corresponds to the @convert_from@ function.
138convertFrom :: Expr ByteString -> Expr Text -> Expr Text
119convertFrom :: Expr ByteString -> Expr Text -> Expr Text
139convertFrom = function "convert_from"
120convertFrom = function "convert_from"
140
121
141
122
142−-- | Corresponds to the @convert_to@ function.
143convertTo :: Expr Text -> Expr Text -> Expr ByteString
123convertTo :: Expr Text -> Expr Text -> Expr ByteString
144convertTo = function "convert_to"
124convertTo = function "convert_to"
145
125
146
126
147−-- | Corresponds to the @decode@ function.
148decode :: Expr Text -> Expr Text -> Expr ByteString
127decode :: Expr Text -> Expr Text -> Expr ByteString
149decode = function "decode"
128decode = function "decode"
150
129
151
130
152−-- | Corresponds to the @encode@ function.
153encode :: Expr ByteString -> Expr Text -> Expr Text
131encode :: Expr ByteString -> Expr Text -> Expr Text
154encode = function "encode"
132encode = function "encode"
155
133
156
134
157−-- | Corresponds to the @initcap@ function.
158initcap :: Expr Text -> Expr Text
135initcap :: Expr Text -> Expr Text
159initcap = function "initcap"
136initcap = function "initcap"
160
137
161
138
162−-- | Corresponds to the @left@ function.
163left :: Expr Text -> Expr Int32 -> Expr Text
139left :: Expr Text -> Expr Int32 -> Expr Text
164left = function "left"
140left = function "left"
165
141
166
142
167−-- | Corresponds to the @length@ function.
168length :: Expr Text -> Expr Int32
143length :: Expr Text -> Expr Int32
169length = function "length"
144length = function "length"
170
145
171
146
172−-- | Corresponds to the @length@ function.
173lengthEncoding :: Expr ByteString -> Expr Text -> Expr Int32
147lengthEncoding :: Expr ByteString -> Expr Text -> Expr Int32
174lengthEncoding = function "length"
148lengthEncoding = function "length"
175
149
176
150
177−-- | Corresponds to the @lpad@ function.
178lpad :: Expr Text -> Expr Int32 -> Maybe (Expr Text) -> Expr Text
151lpad :: Expr Text -> Expr Int32 -> Maybe (Expr Text) -> Expr Text
179lpad a b (Just c) = function "lpad" a b c
152lpad a b (Just c) = function "lpad" a b c
180lpad a b Nothing = function "lpad" a b
153lpad a b Nothing = function "lpad" a b
181
154
182
155
183−-- | Corresponds to the @ltrim@ function.
184ltrim :: Expr Text -> Maybe (Expr Text) -> Expr Text
156ltrim :: Expr Text -> Maybe (Expr Text) -> Expr Text
185ltrim a (Just b) = function "ltrim" a b
157ltrim a (Just b) = function "ltrim" a b
186ltrim a Nothing = function "ltrim" a
158ltrim a Nothing = function "ltrim" a
187
159
188
160
189−-- | Corresponds to the @md5@ function.
190md5 :: Expr Text -> Expr Text
161md5 :: Expr Text -> Expr Text
191md5 = function "md5"
162md5 = function "md5"
192
163
193
164
194−-- | Corresponds to the @pg_client_encoding()@ expression.
195pgClientEncoding :: Expr Text
165pgClientEncoding :: Expr Text
196pgClientEncoding = nullaryFunction "pg_client_encoding"
166pgClientEncoding = nullaryFunction "pg_client_encoding"
197
167
198
168
199−-- | Corresponds to the @quote_ident@ function.
200quoteIdent :: Expr Text -> Expr Text
169quoteIdent :: Expr Text -> Expr Text
201quoteIdent = function "quote_ident"
170quoteIdent = function "quote_ident"
202
171
203
172
204−-- | Corresponds to the @quote_literal@ function.
205quoteLiteral :: Expr Text -> Expr Text
173quoteLiteral :: Expr Text -> Expr Text
206quoteLiteral = function "quote_literal"
174quoteLiteral = function "quote_literal"
207
175
208
176
209−-- | Corresponds to the @quote_nullable@ function.
210quoteNullable :: Expr Text -> Expr Text
177quoteNullable :: Expr Text -> Expr Text
211quoteNullable = function "quote_nullable"
178quoteNullable = function "quote_nullable"
212
179
213
180
214−-- | Corresponds to the @regexp_replace@ function.
215regexpReplace :: ()
181regexpReplace :: ()
216 => Expr Text -> Expr Text -> Expr Text -> Maybe (Expr Text) -> Expr Text
182 => Expr Text -> Expr Text -> Expr Text -> Maybe (Expr Text) -> Expr Text
217regexpReplace a b c (Just d) = function "regexp_replace" a b c d
183regexpReplace a b c (Just d) = function "regexp_replace" a b c d
218regexpReplace a b c Nothing = function "regexp_replace" a b c
184regexpReplace a b c Nothing = function "regexp_replace" a b c
219
185
220
186
221−-- | Corresponds to the @regexp_split_to_array@ function.
222regexpSplitToArray :: ()
187regexpSplitToArray :: ()
223− => Expr Text -> Expr Text -> Maybe (Expr Text) -> Expr [Text]
188+ => Expr Text -> Expr Text -> Maybe (Expr Text) -> Expr (Array1D Text)
224regexpSplitToArray a b (Just c) = function "regexp_split_to_array" a b c
189regexpSplitToArray a b (Just c) = function "regexp_split_to_array" a b c
225regexpSplitToArray a b Nothing = function "regexp_split_to_array" a b
190regexpSplitToArray a b Nothing = function "regexp_split_to_array" a b
226
191
227
192
228−-- | Corresponds to the @repeat@ function.
229repeat :: Expr Text -> Expr Int32 -> Expr Text
193repeat :: Expr Text -> Expr Int32 -> Expr Text
230repeat = function "repeat"
194repeat = function "repeat"
231
195
232
196
233−-- | Corresponds to the @replace@ function.
234replace :: Expr Text -> Expr Text -> Expr Text -> Expr Text
197replace :: Expr Text -> Expr Text -> Expr Text -> Expr Text
235replace = function "replace"
198replace = function "replace"
236
199
237
200
238−-- | Corresponds to the @reverse@ function.
239reverse :: Expr Text -> Expr Text
201reverse :: Expr Text -> Expr Text
240reverse = function "reverse"
202reverse = function "reverse"
241
203
242
204
243−-- | Corresponds to the @right@ function.
244right :: Expr Text -> Expr Int32 -> Expr Text
205right :: Expr Text -> Expr Int32 -> Expr Text
245right = function "right"
206right = function "right"
246
207
247
208
248−-- | Corresponds to the @rpad@ function.
249rpad :: Expr Text -> Expr Int32 -> Maybe (Expr Text) -> Expr Text
209rpad :: Expr Text -> Expr Int32 -> Maybe (Expr Text) -> Expr Text
250rpad a b (Just c) = function "rpad" a b c
210rpad a b (Just c) = function "rpad" a b c
251rpad a b Nothing = function "rpad" a b
211rpad a b Nothing = function "rpad" a b
252
212
253
213
254−-- | Corresponds to the @rtrim@ function.
255rtrim :: Expr Text -> Maybe (Expr Text) -> Expr Text
214rtrim :: Expr Text -> Maybe (Expr Text) -> Expr Text
256rtrim a (Just b) = function "rtrim" a b
215rtrim a (Just b) = function "rtrim" a b
257rtrim a Nothing = function "rtrim" a
216rtrim a Nothing = function "rtrim" a
258
217
259
218
260−-- | Corresponds to the @split_part@ function.
261splitPart :: Expr Text -> Expr Text -> Expr Int32 -> Expr Text
219splitPart :: Expr Text -> Expr Text -> Expr Int32 -> Expr Text
262splitPart = function "split_part"
220splitPart = function "split_part"
263
221
264
222
265−-- | Corresponds to the @strpos@ function.
266strpos :: Expr Text -> Expr Text -> Expr Int32
223strpos :: Expr Text -> Expr Text -> Expr Int32
267strpos = function "strpos"
224strpos = function "strpos"
268
225
269
226
270−-- | Corresponds to the @substr@ function.
271substr :: Expr Text -> Expr Int32 -> Maybe (Expr Int32) -> Expr Text
227substr :: Expr Text -> Expr Int32 -> Maybe (Expr Int32) -> Expr Text
272substr a b (Just c) = function "substr" a b c
228substr a b (Just c) = function "substr" a b c
273substr a b Nothing = function "substr" a b
229substr a b Nothing = function "substr" a b
274
230
275
231
276−-- | Corresponds to the @translate@ function.
277−translate :: Expr Text -> Expr Text -> Expr Text -> Expr Text
232+toAscii :: Expr Text -> Expr Text -> Expr Text
278−translate = function "translate"
233+toAscii = function "toAscii"
279
234
280
235
281−-- | @like x y@ corresponds to the expression @y LIKE x@.
282−--
283−-- Note that the arguments to @like@ are swapped. This is to aid currying, so
284−-- you can write expressions like
285−-- @filter (like "Rel%" . packageName) =<< each haskellPackages@
286−like :: Expr Text -> Expr Text -> Expr Bool
236+toHex :: Expr Int32 -> Expr Text
287−like = flip (binaryOperator "LIKE")
237+toHex = function "toHex"
288
238
289
239
290−-- | @ilike x y@ corresponds to the expression @y ILIKE x@.
291−--
292−-- Note that the arguments to @ilike@ are swapped. This is to aid currying, so
293−-- you can write expressions like
294−-- @filter (ilike "Rel%" . packageName) =<< each haskellPackages@
295−ilike :: Expr Text -> Expr Text -> Expr Bool
240+translate :: Expr Text -> Expr Text -> Expr Text -> Expr Text
296−ilike = flip (binaryOperator "ILIKE")
241+translate = function "translate"
src/Rel8/Expr/Time.hs+2−2
@@ -31,7 +31,7 @@ import Prelude
31-- rel8
31-- rel8
32import Rel8.Expr ( Expr )
32import Rel8.Expr ( Expr )
33import Rel8.Expr.Function ( binaryOperator, nullaryFunction )
33import Rel8.Expr.Function ( binaryOperator, nullaryFunction )
34−import Rel8.Expr.Opaleye ( castExpr, unsafeCastExpr, unsafeLiteral )
34+import Rel8.Expr.Opaleye ( unsafeCastExpr, unsafeLiteral )
35
35
36-- time
36-- time
37import Data.Time.Calendar ( Day )
37import Data.Time.Calendar ( Day )
@@ -164,4 +164,4 @@ years = (`scaleInterval` year)
164
164
165
165
166singleton :: String -> Expr CalendarDiffTime
166singleton :: String -> Expr CalendarDiffTime
167−singleton unit = castExpr $ unsafeLiteral $ "'1 " ++ unit ++ "'"
167+singleton unit = unsafeLiteral $ "'1 " ++ unit ++ "'"
src/Rel8/Expr/Window.hsdeleted−121
@@ -1,121 +0,0 @@
1−module Rel8.Expr.Window
2− ( cumulative
3− , rowNumber
4− , rank
5− , denseRank
6− , percentRank
7− , cumeDist
8− , ntile
9− , lag
10− , lead
11− , firstValue
12− , lastValue
13− , nthValue
14− )
15−where
16−
17−-- base
18−import Data.Int ( Int32, Int64 )
19−import Prelude
20−
21−-- opaleye
22−import qualified Opaleye.Internal.Aggregate as Opaleye
23−import qualified Opaleye.Internal.PackMap as Opaleye
24−import qualified Opaleye.Internal.Window as Opaleye
25−import qualified Opaleye.Window as Opaleye
26−
27−-- profunctors
28−import Data.Profunctor (dimap)
29−
30−-- rel8
31−import Rel8.Aggregate ( Aggregate( Aggregate ) )
32−import Rel8.Expr ( Expr )
33−import Rel8.Expr.Opaleye ( fromColumn, fromPrimExpr, toColumn, toPrimExpr )
34−import Rel8.Schema.Null ( Nullify )
35−import Rel8.Window ( Window( Window ) )
36−
37−
38−cumulative :: (a -> Aggregate b) -> Window a (Expr b)
39−cumulative f =
40− fromWindowFunction $ Opaleye.aggregatorWindowFunction (fromAggregate f) id
41−
42−
43−-- | [@row_number()@](https://www.postgresql.org/docs/current/functions-window.html)
44−rowNumber :: Window a (Expr Int64)
45−rowNumber = fromWindowFunction $ fromPrimExpr . fromColumn <$> Opaleye.rowNumber
46−
47−
48−-- | [@rank()@](https://www.postgresql.org/docs/current/functions-window.html)
49−rank :: Window a (Expr Int64)
50−rank = fromWindowFunction $ fromPrimExpr . fromColumn <$> Opaleye.rank
51−
52−
53−-- | [@dense_rank()@](https://www.postgresql.org/docs/current/functions-window.html)
54−denseRank :: Window a (Expr Int64)
55−denseRank = fromWindowFunction $ fromPrimExpr . fromColumn <$> Opaleye.denseRank
56−
57−
58−-- | [@percent_rank()@](https://www.postgresql.org/docs/current/functions-window.html)
59−percentRank :: Window a (Expr Double)
60−percentRank = fromWindowFunction $ fromPrimExpr . fromColumn <$> Opaleye.percentRank
61−
62−
63−-- | [@cume_dist()@](https://www.postgresql.org/docs/current/functions-window.html)
64−cumeDist :: Window a (Expr Double)
65−cumeDist = fromWindowFunction $ fromPrimExpr . fromColumn <$> Opaleye.cumeDist
66−
67−
68−-- | [@ntile(num_buckets)@](https://www.postgresql.org/docs/current/functions-window.html)
69−ntile :: Expr Int32 -> Window a (Expr Int32)
70−ntile buckets = fromWindowFunction $ fromPrimExpr . fromColumn <$>
71− Opaleye.ntile (toColumn (toPrimExpr buckets))
72−
73−
74−-- | [@lag(value, offset, default)@](https://www.postgresql.org/docs/current/functions-window.html)
75−lag :: Expr Int32 -> Expr a -> Window (Expr a) (Expr a)
76−lag offset def =
77− fromWindowFunction $
78− dimap (toColumn . toPrimExpr) (fromPrimExpr . fromColumn) $
79− Opaleye.lag (toColumn (toPrimExpr offset)) (toColumn (toPrimExpr def))
80−
81−
82−-- | [@lead(value, offset, default)@](https://www.postgresql.org/docs/current/functions-window.html)
83−lead :: Expr Int32 -> Expr a -> Window (Expr a) (Expr a)
84−lead offset def =
85− fromWindowFunction $
86− dimap (toColumn . toPrimExpr) (fromPrimExpr . fromColumn) $
87− Opaleye.lead (toColumn (toPrimExpr offset)) (toColumn (toPrimExpr def))
88−
89−
90−-- | [@first_value(value)@](https://www.postgresql.org/docs/current/functions-window.html)
91−firstValue :: Window (Expr a) (Expr a)
92−firstValue =
93− fromWindowFunction $
94− dimap (toColumn . toPrimExpr) (fromPrimExpr . fromColumn)
95− Opaleye.firstValue
96−
97−
98−-- | [@last_value(value)@](https://www.postgresql.org/docs/current/functions-window.html)
99−lastValue :: Window (Expr a) (Expr a)
100−lastValue =
101− fromWindowFunction $
102− dimap (toColumn . toPrimExpr) (fromPrimExpr . fromColumn)
103− Opaleye.lastValue
104−
105−
106−-- | [@nth_value(value, n)@](https://www.postgresql.org/docs/current/functions-window.html)
107−nthValue :: Expr Int32 -> Window (Expr a) (Expr (Nullify a))
108−nthValue n =
109− fromWindowFunction $
110− dimap (toColumn . toPrimExpr) (fromPrimExpr . fromColumn) $
111− Opaleye.nthValue (toColumn (toPrimExpr n))
112−
113−
114−fromAggregate :: (a -> Aggregate b) -> Opaleye.Aggregator a (Expr b)
115−fromAggregate f = Opaleye.Aggregator $ Opaleye.PackMap $ \w a -> case f a of
116− Aggregate (Opaleye.Aggregator (Opaleye.PackMap x)) -> x w ()
117−
118−
119−fromWindowFunction :: Opaleye.WindowFunction a b -> Window a b
120−fromWindowFunction (Opaleye.WindowFunction (Opaleye.PackMap w)) =
121− Window $ Opaleye.Windows $ Opaleye.PackMap $ \f -> w $ \o -> f (o, mempty)
src/Rel8/FCF.hs+1−9
@@ -3,11 +3,7 @@
3{-# language StandaloneKindSignatures #-}
3{-# language StandaloneKindSignatures #-}
4{-# language TypeFamilies #-}
4{-# language TypeFamilies #-}
5
5
6−module Rel8.FCF
6+module Rel8.FCF ( Exp, Eval ) where
7− ( Exp, Eval
8− , Id
9− )
10−where
11
7
12-- base
8-- base
13import Data.Kind ( Type )
9import Data.Kind ( Type )
@@ -20,7 +16,3 @@ type Exp e = e -> Type
20
16
21type Eval :: Exp e -> e
17type Eval :: Exp e -> e
22type family Eval a
18type family Eval a
23−
24−
25−data Id :: a -> Exp a
26−type instance Eval (Id a) = a
src/Rel8/Generic/Construction.hsdeleted−352
@@ -1,352 +0,0 @@
1−{-# language AllowAmbiguousTypes #-}
2−{-# language ConstraintKinds #-}
3−{-# language DataKinds #-}
4−{-# language FlexibleContexts #-}
5−{-# language NamedFieldPuns #-}
6−{-# language ScopedTypeVariables #-}
7−{-# language StandaloneKindSignatures #-}
8−{-# language TypeApplications #-}
9−{-# language TypeFamilies #-}
10−{-# language UndecidableInstances #-}
11−{-# language ViewPatterns #-}
12−
13−module Rel8.Generic.Construction
14− ( GGBuildable
15− , GGBuild, ggbuild
16− , GGConstructable
17− , GGConstruct, ggconstruct
18− , GGDeconstruct, ggdeconstruct
19− , GGName, ggname
20− , GGAggregate, ggaggregate
21− )
22−where
23−
24−-- base
25−import Data.Bifunctor ( first )
26−import Data.Kind ( Constraint, Type )
27−import Data.List.NonEmpty ( NonEmpty( (:|) ) )
28−import GHC.TypeLits ( Symbol )
29−import Prelude
30−
31−-- rel8
32−import Rel8.Aggregate ( Aggregate( Aggregate ) )
33−import Rel8.Expr ( Expr )
34−import Rel8.Expr.Aggregate ( groupByExpr )
35−import Rel8.Expr.Eq ( (==.) )
36−import Rel8.Expr.Null ( nullify, snull, unsafeUnnullify )
37−import Rel8.Expr.Serialize ( litExpr )
38−import Rel8.FCF ( Eval, Exp, Id )
39−import Rel8.Generic.Construction.ADT
40− ( GConstructorADT, GMakeableADT, gmakeADT
41− , GConstructableADT
42− , GBuildADT, gbuildADT, gunbuildADT
43− , GConstructADT, gconstructADT, gdeconstructADT
44− , RepresentableConstructors, GConstructors, gcindex, gctabulate
45− , RepresentableFields, gfindex, gftabulate
46− )
47−import Rel8.Generic.Construction.Record
48− ( GConstructor
49− , GConstructable, GConstruct, gconstruct, gdeconstruct
50− , Representable, gindex, gtabulate
51− )
52−import Rel8.Generic.Table ( GGColumns )
53−import Rel8.Kind.Algebra
54− ( SAlgebra( SProduct, SSum )
55− , KnownAlgebra, algebraSing
56− )
57−import qualified Rel8.Kind.Algebra as K
58−import Rel8.Schema.Context.Nullify ( sguard, snullify )
59−import Rel8.Schema.HTable ( HTable )
60−import Rel8.Schema.HTable.Identity ( HIdentity( HIdentity ) )
61−import qualified Rel8.Schema.Kind as K
62−import Rel8.Schema.Name ( Name( Name ) )
63−import Rel8.Schema.Null ( Nullity( Null, NotNull ) )
64−import Rel8.Schema.Spec ( Spec( Spec, nullity, info ) )
65−import Rel8.Table
66− ( TTable, TColumns
67− , Table, fromColumns, toColumns
68− )
69−import Rel8.Table.Bool ( case_ )
70−import Rel8.Type.Tag ( Tag )
71−
72−
73−type GGBuildable :: K.Algebra -> Symbol -> (K.Context -> Exp (Type -> Type)) -> Constraint
74−type GGBuildable algebra name rep =
75− ( KnownAlgebra algebra
76− , Eval (GGColumns algebra TColumns (Eval (rep Aggregate))) ~ Eval (GGColumns algebra TColumns (Eval (rep Expr)))
77− , Eval (GGColumns algebra TColumns (Eval (rep Expr))) ~ Eval (GGColumns algebra TColumns (Eval (rep Expr)))
78− , Eval (GGColumns algebra TColumns (Eval (rep Name))) ~ Eval (GGColumns algebra TColumns (Eval (rep Expr)))
79− , HTable (Eval (GGColumns algebra TColumns (Eval (rep Expr))))
80− , GGBuildable' algebra name rep
81− )
82−
83−
84−type GGBuildable' :: K.Algebra -> Symbol -> (K.Context -> Exp (Type -> Type)) -> Constraint
85−type family GGBuildable' algebra name rep where
86− GGBuildable' 'K.Product name rep =
87− ( name ~ GConstructor (Eval (rep Expr))
88− , Representable Id (Eval (rep Expr))
89− , GConstructable (TTable Expr) TColumns Id Expr (Eval (rep Expr))
90− )
91− GGBuildable' 'K.Sum name rep =
92− ( Representable Id (GConstructorADT name (Eval (rep Expr)))
93− , GMakeableADT (TTable Expr) TColumns Id Expr name (Eval (rep Expr))
94− )
95−
96−
97−type GGBuild :: K.Algebra -> Symbol -> (K.Context -> Exp (Type -> Type)) -> Type -> Type
98−type family GGBuild algebra name rep r where
99− GGBuild 'K.Product _name rep r =
100− GConstruct Id (Eval (rep Expr)) r
101− GGBuild 'K.Sum name rep r =
102− GConstruct Id (GConstructorADT name (Eval (rep Expr))) r
103−
104−
105−ggbuild :: forall algebra name rep a. GGBuildable algebra name rep
106− => (Eval (GGColumns algebra TColumns (Eval (rep Expr))) Expr -> a)
107− -> GGBuild algebra name rep a
108−ggbuild gfromColumns = case algebraSing @algebra of
109− SProduct ->
110− gtabulate @Id @(Eval (rep Expr)) @a $
111− gfromColumns .
112− gconstruct
113− @(TTable Expr)
114− @TColumns
115− @Id
116− @Expr
117− @(Eval (rep Expr))
118− (const toColumns)
119− SSum ->
120− gtabulate @Id @(GConstructorADT name (Eval (rep Expr))) @a $
121− gfromColumns .
122− gmakeADT
123− @(TTable Expr)
124− @TColumns
125− @Id
126− @Expr
127− @name
128− @(Eval (rep Expr))
129− (const toColumns)
130− (\Spec {info} -> snull info)
131− (\Spec {nullity} -> case nullity of
132− Null -> id
133− NotNull -> nullify)
134− (HIdentity . litExpr)
135−
136−
137−type GGConstructable :: K.Algebra -> (K.Context -> Exp (Type -> Type)) -> Constraint
138−type GGConstructable algebra rep =
139− ( KnownAlgebra algebra
140− , Eval (GGColumns algebra TColumns (Eval (rep Aggregate))) ~ Eval (GGColumns algebra TColumns (Eval (rep Expr)))
141− , Eval (GGColumns algebra TColumns (Eval (rep Expr))) ~ Eval (GGColumns algebra TColumns (Eval (rep Expr)))
142− , Eval (GGColumns algebra TColumns (Eval (rep Name))) ~ Eval (GGColumns algebra TColumns (Eval (rep Expr)))
143− , HTable (Eval (GGColumns algebra TColumns (Eval (rep Expr))))
144− , GGConstructable' algebra rep
145− )
146−
147−
148−type GGConstructable' :: K.Algebra -> (K.Context -> Exp (Type -> Type)) -> Constraint
149−type family GGConstructable' algebra rep where
150− GGConstructable' 'K.Product rep =
151− ( Representable Id (Eval (rep Aggregate))
152− , Representable Id (Eval (rep Expr))
153− , Representable Id (Eval (rep Name))
154− , GConstructable (TTable Aggregate) TColumns Id Aggregate (Eval (rep Aggregate))
155− , GConstructable (TTable Expr) TColumns Id Expr (Eval (rep Expr))
156− , GConstructable (TTable Name) TColumns Id Name (Eval (rep Name))
157− )
158− GGConstructable' 'K.Sum rep =
159− ( RepresentableConstructors Id (Eval (rep Expr))
160− , RepresentableFields Id (Eval (rep Aggregate))
161− , RepresentableFields Id (Eval (rep Expr))
162− , RepresentableFields Id (Eval (rep Name))
163− , Functor (GConstructors Id (Eval (rep Expr)))
164− , GConstructableADT (TTable Aggregate) TColumns Id Aggregate (Eval (rep Aggregate))
165− , GConstructableADT (TTable Expr) TColumns Id Expr (Eval (rep Expr))
166− , GConstructableADT (TTable Name) TColumns Id Name (Eval (rep Name))
167− )
168−
169−
170−type GGConstruct :: K.Algebra -> (K.Context -> Exp (Type -> Type)) -> Type -> Type
171−type family GGConstruct algebra rep r where
172− GGConstruct 'K.Product rep r = GConstruct Id (Eval (rep Expr)) r -> r
173− GGConstruct 'K.Sum rep r = GConstructADT Id (Eval (rep Expr)) r r
174−
175−
176−ggconstruct :: forall algebra rep a. GGConstructable algebra rep
177− => (Eval (GGColumns algebra TColumns (Eval (rep Expr))) Expr -> a)
178− -> GGConstruct algebra rep a -> a
179−ggconstruct gfromColumns f = case algebraSing @algebra of
180− SProduct ->
181− f $
182− gtabulate @Id @(Eval (rep Expr)) @a $
183− gfromColumns .
184− gconstruct
185− @(TTable Expr)
186− @TColumns
187− @Id
188− @Expr
189− @(Eval (rep Expr))
190− (const toColumns)
191− SSum ->
192− gcindex @Id @(Eval (rep Expr)) @a f $
193− fmap gfromColumns $
194− gconstructADT
195− @(TTable Expr)
196− @TColumns
197− @Id
198− @Expr
199− @(Eval (rep Expr))
200− (const toColumns)
201− (\Spec {info} -> snull info)
202− (\Spec {nullity} -> case nullity of
203− Null -> id
204− NotNull -> nullify)
205− (HIdentity . litExpr)
206−
207−
208−type GGDeconstruct :: K.Algebra -> (K.Context -> Exp (Type -> Type)) -> Type -> Type -> Type
209−type family GGDeconstruct algebra rep a r where
210− GGDeconstruct 'K.Product rep a r =
211− GConstruct Id (Eval (rep Expr)) r -> a -> r
212− GGDeconstruct 'K.Sum rep a r =
213− GConstructADT Id (Eval (rep Expr)) r (a -> r)
214−
215−
216−ggdeconstruct :: forall algebra rep a r. (GGConstructable algebra rep, Table Expr r)
217− => (a -> Eval (GGColumns algebra TColumns (Eval (rep Expr))) Expr)
218− -> GGDeconstruct algebra rep a r
219−ggdeconstruct gtoColumns = case algebraSing @algebra of
220− SProduct -> \build ->
221− gindex @Id @(Eval (rep Expr)) @r build .
222− gdeconstruct
223− @(TTable Expr)
224− @TColumns
225− @Id
226− @Expr
227− @(Eval (rep Expr))
228− (const fromColumns) .
229− gtoColumns
230− SSum ->
231− gctabulate @Id @(Eval (rep Expr)) @r @(a -> r) $ \constructors as ->
232− let
233− (HIdentity tag, cases) =
234− gdeconstructADT
235− @(TTable Expr)
236− @TColumns
237− @Id
238− @Expr
239− @(Eval (rep Expr))
240− (const fromColumns)
241− (\Spec {nullity} -> case nullity of
242− Null -> id
243− NotNull -> unsafeUnnullify)
244− constructors $
245− gtoColumns as
246− in
247− case cases of
248− ((_, r) :| (map (first ((tag ==.) . litExpr)) -> cases')) ->
249− case_ cases' r
250−
251−
252−type GGName :: K.Algebra -> (K.Context -> Exp (Type -> Type)) -> Type -> Type
253−type family GGName algebra rep a where
254− GGName 'K.Product rep a = GConstruct Id (Eval (rep Name)) a
255− GGName 'K.Sum rep a = Name Tag -> GBuildADT Id (Eval (rep Name)) a
256−
257−
258−ggname :: forall algebra rep a. GGConstructable algebra rep
259− => (Eval (GGColumns algebra TColumns (Eval (rep Expr))) Name -> a)
260− -> GGName algebra rep a
261−ggname gfromColumns = case algebraSing @algebra of
262− SProduct ->
263− gtabulate @Id @(Eval (rep Name)) @a $
264− gfromColumns .
265− gconstruct
266− @(TTable Name)
267− @TColumns
268− @Id
269− @Name
270− @(Eval (rep Name))
271− (const toColumns)
272− SSum -> \tag ->
273− gftabulate @Id @(Eval (rep Name)) @a $
274− gfromColumns .
275− gbuildADT
276− @(TTable Name)
277− @TColumns
278− @Id
279− @Name
280− @(Eval (rep Name))
281− (const toColumns)
282− (\_ _ (Name a) -> Name a)
283− (HIdentity tag)
284−
285−
286−type GGAggregate :: K.Algebra -> (K.Context -> Exp (Type -> Type)) -> Type -> Type
287−type family GGAggregate algebra rep r where
288− GGAggregate 'K.Product rep r =
289− GConstruct Id (Eval (rep Aggregate)) r ->
290− GConstruct Id (Eval (rep Expr)) r
291− GGAggregate 'K.Sum rep r =
292− GBuildADT Id (Eval (rep Aggregate)) r ->
293− GBuildADT Id (Eval (rep Expr)) r
294−
295−
296−ggaggregate :: forall algebra rep exprs agg. GGConstructable algebra rep
297− => (Eval (GGColumns algebra TColumns (Eval (rep Expr))) Aggregate -> agg)
298− -> (exprs -> Eval (GGColumns algebra TColumns (Eval (rep Expr))) Expr)
299− -> GGAggregate algebra rep agg -> exprs -> agg
300−ggaggregate gfromColumns gtoColumns agg es = case algebraSing @algebra of
301− SProduct -> flip f exprs $
302− gfromColumns .
303− gconstruct
304− @(TTable Aggregate)
305− @TColumns
306− @Id
307− @Aggregate
308− @(Eval (rep Aggregate))
309− (const toColumns)
310− where
311− f =
312− gindex @Id @(Eval (rep Expr)) @agg .
313− agg .
314− gtabulate @Id @(Eval (rep Aggregate)) @agg
315− exprs =
316− gdeconstruct
317− @(TTable Expr)
318− @TColumns
319− @Id
320− @Expr
321− @(Eval (rep Expr))
322− (const fromColumns) $
323− gtoColumns es
324− SSum -> flip f exprs $
325− gfromColumns .
326− gbuildADT
327− @(TTable Aggregate)
328− @TColumns
329− @Id
330− @Aggregate
331− @(Eval (rep Aggregate))
332− (const toColumns)
333− (\tag' Spec {nullity} (Aggregate a) ->
334− Aggregate $ sguard (tag ==. litExpr tag') . snullify nullity <$> a)
335− (HIdentity (groupByExpr tag))
336− where
337− f =
338− gfindex @Id @(Eval (rep Expr)) @agg .
339− agg .
340− gftabulate @Id @(Eval (rep Aggregate)) @agg
341− (HIdentity tag, exprs) =
342− gunbuildADT
343− @(TTable Expr)
344− @TColumns
345− @Id
346− @Expr
347− @(Eval (rep Expr))
348− (const fromColumns)
349− (\Spec {nullity} -> case nullity of
350− Null -> id
351− NotNull -> unsafeUnnullify) $
352− gtoColumns es
src/Rel8/Generic/Construction/ADT.hsdeleted−478
@@ -1,478 +0,0 @@
1−{-# language AllowAmbiguousTypes #-}
2−{-# language BlockArguments #-}
3−{-# language DataKinds #-}
4−{-# language FlexibleContexts #-}
5−{-# language FlexibleInstances #-}
6−{-# language MultiParamTypeClasses #-}
7−{-# language RankNTypes #-}
8−{-# language ScopedTypeVariables #-}
9−{-# language StandaloneKindSignatures #-}
10−{-# language TupleSections #-}
11−{-# language TypeApplications #-}
12−{-# language TypeFamilies #-}
13−{-# language TypeOperators #-}
14−{-# language UndecidableInstances #-}
15−
16−module Rel8.Generic.Construction.ADT
17− ( GConstructableADT
18− , GBuildADT, gbuildADT, gunbuildADT
19− , GConstructADT, gconstructADT, gdeconstructADT
20− , GFields, RepresentableFields, gftabulate, gfindex
21− , GConstructors, RepresentableConstructors, gctabulate, gcindex
22− , GConstructorADT, GMakeableADT, gmakeADT
23− )
24−where
25−
26−-- base
27−import Data.Bifunctor ( first )
28−import Data.Functor.Identity ( runIdentity )
29−import Data.Kind ( Constraint, Type )
30−import Data.List.NonEmpty ( NonEmpty )
31−import Data.Proxy ( Proxy( Proxy ) )
32−import GHC.Generics
33− ( (:+:), (:*:)( (:*:) ), M1, U1
34− , C, D
35− , Meta( MetaData, MetaCons )
36− )
37−import GHC.TypeLits
38− ( ErrorMessage( (:<>:), Text ), TypeError
39− , Symbol, KnownSymbol, symbolVal
40− )
41−import Prelude hiding ( null )
42−
43−-- rel8
44−import Rel8.FCF ( Exp )
45−import Rel8.Generic.Construction.Record
46− ( GConstruct, GConstructable, gconstruct, gdeconstruct
47− , GFields, Representable, gtabulate, gindex
48− , FromColumns, ToColumns
49− )
50−import Rel8.Generic.Table.ADT ( GColumnsADT, GColumnsADT' )
51−import Rel8.Generic.Table.Record ( GColumns )
52−import Rel8.Schema.HTable ( HTable )
53−import Rel8.Schema.HTable.Identity ( HIdentity )
54−import Rel8.Schema.HTable.Label ( HLabel, hlabel, hunlabel )
55−import Rel8.Schema.HTable.Nullify ( HNullify, hnulls, hnullify, hunnullify )
56−import Rel8.Schema.HTable.Product ( HProduct( HProduct ) )
57−import Rel8.Schema.Null ( Nullify )
58−import Rel8.Schema.Spec ( Spec )
59−import qualified Rel8.Schema.Kind as K
60−import Rel8.Type.Tag ( Tag( Tag ) )
61−
62−-- text
63−import Data.Text ( pack )
64−
65−
66−type Null :: K.Context -> Type
67−type Null context = forall a. Spec a -> context (Nullify a)
68−
69−
70−type Nullifier :: K.Context -> Type
71−type Nullifier context = forall a. Spec a -> context a -> context (Nullify a)
72−
73−
74−type Unnullifier :: K.Context -> Type
75−type Unnullifier context = forall a. Spec a -> context (Nullify a) -> context a
76−
77−
78−type NoConstructor :: Symbol -> Symbol -> ErrorMessage
79−type NoConstructor datatype constructor =
80− ( 'Text "The type `" ':<>:
81− 'Text datatype ':<>:
82− 'Text "` has no constructor `" ':<>:
83− 'Text constructor ':<>:
84− 'Text "`."
85− )
86−
87−
88−type GConstructorADT :: Symbol -> (Type -> Type) -> Type -> Type
89−type family GConstructorADT name rep where
90− GConstructorADT name (M1 D ('MetaData datatype _ _ _) rep) =
91− GConstructorADT' name rep (TypeError (NoConstructor datatype name))
92−
93−
94−type GConstructorADT' :: Symbol -> (Type -> Type) -> (Type -> Type) -> Type -> Type
95−type family GConstructorADT' name rep fallback where
96− GConstructorADT' name (M1 D _ rep) fallback =
97− GConstructorADT' name rep fallback
98− GConstructorADT' name (a :+: b) fallback =
99− GConstructorADT' name a (GConstructorADT' name b fallback)
100− GConstructorADT' name (M1 C ('MetaCons name _ _) rep) _ = rep
101− GConstructorADT' _ _ fallback = fallback
102−
103−
104−type GConstructADT
105− :: (Type -> Exp Type)
106− -> (Type -> Type) -> Type -> Type -> Type
107−type family GConstructADT f rep r x where
108− GConstructADT f (M1 D _ rep) r x = GConstructADT f rep r x
109− GConstructADT f (a :+: b) r x = GConstructADT f a r (GConstructADT f b r x)
110− GConstructADT f (M1 C _ rep) r x = GConstruct f rep r -> x
111−
112−
113−type GConstructors :: (Type -> Exp Type) -> (Type -> Type) -> Type -> Type
114−type family GConstructors f rep where
115− GConstructors f (M1 D _ rep) = GConstructors f rep
116− GConstructors f (a :+: b) = GConstructors f a :*: GConstructors f b
117− GConstructors f (M1 C _ rep) = (->) (GFields f rep)
118−
119−
120−type RepresentableConstructors :: (Type -> Exp Type) -> (Type -> Type) -> Constraint
121−class RepresentableConstructors f rep where
122− gctabulate :: (GConstructors f rep r -> a) -> GConstructADT f rep r a
123− gcindex :: GConstructADT f rep r a -> GConstructors f rep r -> a
124−
125−
126−instance RepresentableConstructors f rep => RepresentableConstructors f (M1 D meta rep) where
127− gctabulate = gctabulate @f @rep
128− gcindex = gcindex @f @rep
129−
130−
131−instance (RepresentableConstructors f a, RepresentableConstructors f b) =>
132− RepresentableConstructors f (a :+: b)
133− where
134− gctabulate f =
135− gctabulate @f @a \a -> gctabulate @f @b \b -> f (a :*: b)
136− gcindex f (a :*: b) = gcindex @f @b (gcindex @f @a f a) b
137−
138−
139−instance Representable f rep => RepresentableConstructors f (M1 C meta rep) where
140− gctabulate f = f . gindex @f @rep
141− gcindex f = f . gtabulate @f @rep
142−
143−
144−type GBuildADT :: (Type -> Exp Type) -> (Type -> Type) -> Type -> Type
145−type family GBuildADT f rep r where
146− GBuildADT f (M1 D _ rep) r = GBuildADT f rep r
147− GBuildADT f (a :+: b) r = GBuildADT f a (GBuildADT f b r)
148− GBuildADT f (M1 C _ rep) r = GConstruct f rep r
149−
150−
151−type GFieldsADT :: (Type -> Exp Type) -> (Type -> Type) -> Type
152−type family GFieldsADT f rep where
153− GFieldsADT f (M1 D _ rep) = GFieldsADT f rep
154− GFieldsADT f (a :+: b) = (GFieldsADT f a, GFieldsADT f b)
155− GFieldsADT f (M1 C _ rep) = GFields f rep
156−
157−
158−type RepresentableFields :: (Type -> Exp Type) -> (Type -> Type) -> Constraint
159−class RepresentableFields f rep where
160− gftabulate :: (GFieldsADT f rep -> a) -> GBuildADT f rep a
161− gfindex :: GBuildADT f rep a -> GFieldsADT f rep -> a
162−
163−
164−instance RepresentableFields f rep => RepresentableFields f (M1 D meta rep) where
165− gftabulate = gftabulate @f @rep
166− gfindex = gfindex @f @rep
167−
168−
169−instance (RepresentableFields f a, RepresentableFields f b) => RepresentableFields f (a :+: b) where
170− gftabulate f =
171− gftabulate @f @a \a -> gftabulate @f @b \b -> f (a, b)
172− gfindex f (a, b) = gfindex @f @b (gfindex @f @a f a) b
173−
174−
175−instance Representable f rep => RepresentableFields f (M1 C meta rep) where
176− gftabulate = gtabulate @f @rep
177− gfindex = gindex @f @rep
178−
179−
180−type GConstructableADT
181− :: (Type -> Exp Constraint)
182− -> (Type -> Exp K.HTable)
183− -> (Type -> Exp Type)
184− -> K.Context -> (Type -> Type) -> Constraint
185−class GConstructableADT _Table _Columns f context rep where
186− gbuildADT :: ()
187− => ToColumns _Table _Columns f context
188− -> (Tag -> Nullifier context)
189− -> HIdentity Tag context
190− -> GFieldsADT f rep
191− -> GColumnsADT _Columns rep context
192−
193− gunbuildADT :: ()
194− => FromColumns _Table _Columns f context
195− -> Unnullifier context
196− -> GColumnsADT _Columns rep context
197− -> (HIdentity Tag context, GFieldsADT f rep)
198−
199− gconstructADT :: ()
200− => ToColumns _Table _Columns f context
201− -> Null context
202− -> Nullifier context
203− -> (Tag -> HIdentity Tag context)
204− -> GConstructors f rep (GColumnsADT _Columns rep context)
205−
206− gdeconstructADT :: ()
207− => FromColumns _Table _Columns f context
208− -> Unnullifier context
209− -> GConstructors f rep r
210− -> GColumnsADT _Columns rep context
211− -> (HIdentity Tag context, NonEmpty (Tag, r))
212−
213−
214−instance
215− ( htable ~ HLabel "tag" (HIdentity Tag)
216− , GConstructableADT' _Table _Columns f context htable rep
217− )
218− => GConstructableADT _Table _Columns f context (M1 D meta rep)
219− where
220− gbuildADT toColumns nullifier =
221− gbuildADT' @_Table @_Columns @f @context @htable @rep toColumns nullifier .
222− hlabel
223−
224− gunbuildADT fromColumns unnullifier =
225− first hunlabel .
226− gunbuildADT' @_Table @_Columns @f @context @htable @rep fromColumns unnullifier
227−
228− gconstructADT toColumns null nullifier mk =
229− gconstructADT' @_Table @_Columns @f @context @htable @rep toColumns null nullifier
230− (hlabel . mk)
231−
232− gdeconstructADT fromColumns unnullifier cases =
233− first hunlabel .
234− gdeconstructADT' @_Table @_Columns @f @context @htable @rep fromColumns unnullifier cases
235−
236−
237−type GConstructableADT'
238− :: (Type -> Exp Constraint)
239− -> (Type -> Exp K.HTable)
240− -> (Type -> Exp Type)
241− -> K.Context -> K.HTable -> (Type -> Type) -> Constraint
242−class GConstructableADT' _Table _Columns f context htable rep where
243− gbuildADT' :: ()
244− => ToColumns _Table _Columns f context
245− -> (Tag -> Nullifier context)
246− -> htable context
247− -> GFieldsADT f rep
248− -> GColumnsADT' _Columns htable rep context
249−
250− gunbuildADT' :: ()
251− => FromColumns _Table _Columns f context
252− -> Unnullifier context
253− -> GColumnsADT' _Columns htable rep context
254− -> (htable context, GFieldsADT f rep)
255−
256− gconstructADT' :: ()
257− => ToColumns _Table _Columns f context
258− -> Null context
259− -> Nullifier context
260− -> (Tag -> htable context)
261− -> GConstructors f rep (GColumnsADT' _Columns htable rep context)
262−
263− gdeconstructADT' :: ()
264− => FromColumns _Table _Columns f context
265− -> Unnullifier context
266− -> GConstructors f rep r
267− -> GColumnsADT' _Columns htable rep context
268− -> (htable context, NonEmpty (Tag, r))
269−
270− gfill :: ()
271− => Null context
272− -> htable context
273− -> GColumnsADT' _Columns htable rep context
274−
275−
276−instance
277− ( htable' ~ GColumnsADT' _Columns htable a
278− , Functor (GConstructors f a)
279− , GConstructableADT' _Table _Columns f context htable a
280− , GConstructableADT' _Table _Columns f context htable' b
281− )
282− => GConstructableADT' _Table _Columns f context htable (a :+: b)
283− where
284− gbuildADT' toColumns nullifier htable (a, b) =
285− gbuildADT' @_Table @_Columns @f @context @htable' @b toColumns nullifier
286− (gbuildADT' @_Table @_Columns @f @context @htable @a toColumns nullifier htable a)
287− b
288−
289− gunbuildADT' fromColumns unnullifier columns =
290− case gunbuildADT' @_Table @_Columns @f @context @htable' @b fromColumns unnullifier columns of
291− (htable', b) ->
292− case gunbuildADT' @_Table @_Columns @f @context @htable @a fromColumns unnullifier htable' of
293− (htable, a) -> (htable, (a, b))
294−
295− gconstructADT' toColumns null nullifier mk =
296− fmap (gfill @_Table @_Columns @f @context @htable' @b null) (gconstructADT' @_Table @_Columns @f @context @htable @a toColumns null nullifier mk) :*:
297− gconstructADT' @_Table @_Columns @f @context @htable' @b toColumns null nullifier (gfill @_Table @_Columns @f @context @htable @a null . mk)
298−
299− gdeconstructADT' fromColumns unnullifier (a :*: b) columns =
300− case gdeconstructADT' @_Table @_Columns @f @context @htable' @b fromColumns unnullifier b columns of
301− (htable', cases) ->
302− case gdeconstructADT' @_Table @_Columns @f @context @htable @a fromColumns unnullifier a htable' of
303− (htable, cases') -> (htable, cases' <> cases)
304−
305− gfill null =
306− gfill @_Table @_Columns @f @context @htable' @b null .
307− gfill @_Table @_Columns @f @context @htable @a null
308−
309−
310−instance (meta ~ 'MetaCons label _fixity _isRecord, KnownSymbol label) =>
311− GConstructableADT' _Table _Columns f context htable (M1 C meta U1)
312− where
313− gbuildADT' _ _ = const
314− gunbuildADT' _ _ = (, ())
315− gconstructADT' _ _ _ f _ = f tag
316− where
317− tag = Tag $ pack $ symbolVal (Proxy @label)
318− gdeconstructADT' _ _ r htable = (htable, pure (tag, r ()))
319− where
320− tag = Tag $ pack $ symbolVal (Proxy @label)
321− gfill _ = id
322−
323−
324−instance {-# OVERLAPPABLE #-}
325− ( HTable (GColumns _Columns rep)
326− , KnownSymbol label
327− , meta ~ 'MetaCons label _fixity _isRecord
328− , GConstructable _Table _Columns f context rep
329− , GColumnsADT' _Columns htable (M1 C meta rep) ~
330− HProduct htable (HLabel label (HNullify (GColumns _Columns rep)))
331− )
332− => GConstructableADT' _Table _Columns f context htable (M1 C meta rep)
333− where
334− gbuildADT' toColumns nullifier htable =
335− HProduct htable .
336− hlabel .
337− hnullify (nullifier tag) .
338− gconstruct @_Table @_Columns @f @context @rep toColumns
339− where
340− tag = Tag $ pack $ symbolVal (Proxy @label)
341−
342− gunbuildADT' fromColumns unnullifier (HProduct htable a) =
343− ( htable
344− , gdeconstruct @_Table @_Columns @f @context @rep fromColumns $
345− runIdentity $
346− hunnullify (\spec -> pure . unnullifier spec) $
347− hunlabel
348− a
349− )
350−
351− gconstructADT' toColumns _ nullifier mk =
352− HProduct htable .
353− hlabel .
354− hnullify nullifier .
355− gconstruct @_Table @_Columns @f @context @rep toColumns
356− where
357− tag = Tag $ pack $ symbolVal (Proxy @label)
358− htable = mk tag
359−
360− gdeconstructADT' fromColumns unnullifier r (HProduct htable columns) =
361− ( htable
362− , pure (tag, r a)
363− )
364− where
365− a = gdeconstruct @_Table @_Columns @f @context @rep fromColumns $
366− runIdentity $
367− hunnullify (\spec -> pure . unnullifier spec) $
368− hunlabel
369− columns
370− tag = Tag $ pack $ symbolVal (Proxy @label)
371−
372− gfill null htable = HProduct htable (hlabel (hnulls null))
373−
374−
375−type GMakeableADT
376− :: (Type -> Exp Constraint)
377− -> (Type -> Exp K.HTable)
378− -> (Type -> Exp Type)
379− -> K.Context -> Symbol -> (Type -> Type) -> Constraint
380−class GMakeableADT _Table _Columns f context name rep where
381− gmakeADT :: ()
382− => ToColumns _Table _Columns f context
383− -> Null context
384− -> Nullifier context
385− -> (Tag -> HIdentity Tag context)
386− -> GFields f (GConstructorADT name rep)
387− -> GColumnsADT _Columns rep context
388−
389−
390−instance
391− ( htable ~ HLabel "tag" (HIdentity Tag)
392− , meta ~ 'MetaData datatype _module _package _newtype
393− , fallback ~ TypeError (NoConstructor datatype name)
394− , fields ~ GFields f (GConstructorADT' name rep fallback)
395− , GMakeableADT' _Table _Columns f context htable name rep fields
396− , KnownSymbol name
397− )
398− => GMakeableADT _Table _Columns f context name (M1 D meta rep)
399− where
400− gmakeADT toColumns null nullifier wrap =
401− gmakeADT'
402− @_Table @_Columns @f @context @htable @name @rep @fields
403− toColumns null nullifier htable
404− where
405− tag = Tag $ pack $ symbolVal (Proxy @name)
406− htable = hlabel (wrap tag)
407−
408−
409−type GMakeableADT'
410− :: (Type -> Exp Constraint)
411− -> (Type -> Exp K.HTable)
412− -> (Type -> Exp Type)
413− -> K.Context -> K.HTable -> Symbol -> (Type -> Type) -> Type -> Constraint
414−class GMakeableADT' _Table _Columns f context htable name rep fields where
415− gmakeADT' :: ()
416− => ToColumns _Table _Columns f context
417− -> Null context
418− -> Nullifier context
419− -> htable context
420− -> fields
421− -> GColumnsADT' _Columns htable rep context
422−
423−
424−instance
425− ( htable' ~ GColumnsADT' _Columns htable a
426− , GMakeableADT' _Table _Columns f context htable name a fields
427− , GMakeableADT' _Table _Columns f context htable' name b fields
428− )
429− => GMakeableADT' _Table _Columns f context htable name (a :+: b) fields
430− where
431− gmakeADT' toColumns null nullifier htable x =
432− gmakeADT' @_Table @_Columns @f @context @htable' @name @b @fields
433− toColumns null nullifier
434− (gmakeADT'
435− @_Table @_Columns @f @context @htable @name @a @fields toColumns
436− null nullifier htable x)
437− x
438−
439−
440−instance {-# OVERLAPPING #-}
441− GMakeableADT' _Table _Columns f context htable name (M1 C ('MetaCons name _fixity _isRecord) U1) fields
442− where
443− gmakeADT' _ _ _ = const
444−
445−
446−instance {-# OVERLAPS #-}
447− GMakeableADT' _Table _Columns f context htable name (M1 C ('MetaCons label _fixity _isRecord) U1) fields
448− where
449− gmakeADT' _ _ _ = const
450−
451−
452−instance {-# OVERLAPS #-}
453− ( HTable (GColumns _Columns rep)
454− , GConstructable _Table _Columns f context rep
455− , fields ~ GFields f rep
456− , GColumnsADT' _Columns htable (M1 C ('MetaCons name _fixity _isRecord) rep) ~
457− HProduct htable (HLabel name (HNullify (GColumns _Columns rep)))
458− )
459− => GMakeableADT' _Table _Columns f context htable name (M1 C ('MetaCons name _fixity _isRecord) rep) fields
460− where
461− gmakeADT' toColumns _ nullifier htable =
462− HProduct htable .
463− hlabel .
464− hnullify nullifier .
465− gconstruct @_Table @_Columns @f @context @rep toColumns
466−
467−
468−instance {-# OVERLAPPABLE #-}
469− ( HTable (GColumns _Columns rep)
470− , GColumnsADT' _Columns htable (M1 C ('MetaCons label _fixity _isRecord) rep) ~
471− HProduct htable (HLabel label (HNullify (GColumns _Columns rep)))
472− )
473− => GMakeableADT' _Table _Columns f context htable name (M1 C ('MetaCons label _fixity _isRecord) rep) fields
474− where
475− gmakeADT' _ null _ htable _ =
476− HProduct htable $
477− hlabel $
478− hnulls null
src/Rel8/Generic/Construction/Record.hsdeleted−168
@@ -1,168 +0,0 @@
1−{-# language AllowAmbiguousTypes #-}
2−{-# language BlockArguments #-}
3−{-# language DataKinds #-}
4−{-# language FlexibleInstances #-}
5−{-# language MultiParamTypeClasses #-}
6−{-# language RankNTypes #-}
7−{-# language ScopedTypeVariables #-}
8−{-# language StandaloneKindSignatures #-}
9−{-# language TypeApplications #-}
10−{-# language TypeFamilies #-}
11−{-# language TypeOperators #-}
12−{-# language UndecidableInstances #-}
13−
14−module Rel8.Generic.Construction.Record
15− ( GConstructor, GConstruct, GConstructable, gconstruct, gdeconstruct
16− , GFields, Representable, gtabulate, gindex
17− , FromColumns, ToColumns
18− )
19−where
20−
21−-- base
22−import Data.Kind ( Constraint, Type )
23−import Data.Proxy ( Proxy( Proxy ) )
24−import GHC.Generics
25− ( (:*:), K1, M1, U1
26− , D, C, S, Meta( MetaData, MetaCons, MetaSel )
27− )
28−import GHC.TypeLits
29− ( ErrorMessage( (:<>:), Text ), TypeError
30− , Symbol
31− )
32−import Prelude
33−
34−-- rel8
35−import Rel8.FCF ( Eval, Exp )
36−import Rel8.Generic.Table.Record ( GColumns )
37−import Rel8.Schema.HTable.Label ( hlabel, hunlabel )
38−import Rel8.Schema.HTable.Product ( HProduct( HProduct ) )
39−import qualified Rel8.Schema.Kind as K
40−
41−
42−type FromColumns
43− :: (Type -> Exp Constraint)
44− -> (Type -> Exp K.HTable)
45− -> (Type -> Exp Type)
46− -> K.Context
47− -> Type
48−type FromColumns _Table _Columns f context = forall proxy x.
49− Eval (_Table x) => proxy x -> Eval (_Columns x) context -> Eval (f x)
50−
51−
52−type ToColumns
53− :: (Type -> Exp Constraint)
54− -> (Type -> Exp K.HTable)
55− -> (Type -> Exp Type)
56− -> K.Context
57− -> Type
58−type ToColumns _Table _Columns f context = forall proxy x.
59− Eval (_Table x) => proxy x -> Eval (f x) -> Eval (_Columns x) context
60−
61−
62−type GConstructor :: (Type -> Type) -> Symbol
63−type family GConstructor rep where
64− GConstructor (M1 D _ (M1 C ('MetaCons name _ _) _)) = name
65− GConstructor (M1 D ('MetaData name _ _ _) _) = TypeError (
66− 'Text "`" ':<>:
67− 'Text name ':<>:
68− 'Text "` does not appear to have exactly 1 constructor"
69− )
70−
71−
72−type GConstruct :: (Type -> Exp Type) -> (Type -> Type) -> Type -> Type
73−type family GConstruct f rep r where
74− GConstruct f (M1 _ _ rep) r = GConstruct f rep r
75− GConstruct f (a :*: b) r = GConstruct f a (GConstruct f b r)
76− GConstruct _ U1 r = r
77− GConstruct f (K1 _ a) r = Eval (f a) -> r
78−
79−
80−type GFields :: (Type -> Exp Type) -> (Type -> Type) -> Type
81−type family GFields f rep where
82− GFields f (M1 _ _ rep) = GFields f rep
83− GFields f (a :*: b) = (GFields f a, GFields f b)
84− GFields _ U1 = ()
85− GFields f (K1 _ a) = Eval (f a)
86−
87−
88−type Representable :: (Type -> Exp Type) -> (Type -> Type) -> Constraint
89−class Representable f rep where
90− gtabulate :: (GFields f rep -> a) -> GConstruct f rep a
91− gindex :: GConstruct f rep a -> GFields f rep -> a
92−
93−
94−instance Representable f rep => Representable f (M1 i meta rep) where
95− gtabulate = gtabulate @f @rep
96− gindex = gindex @f @rep
97−
98−
99−instance (Representable f a, Representable f b) =>
100− Representable f (a :*: b)
101− where
102− gtabulate f = gtabulate @f @a \a -> gtabulate @f @b \b -> f (a, b)
103− gindex f (a, b) = gindex @f @b (gindex @f @a f a) b
104−
105−
106−instance Representable f U1 where
107− gtabulate = ($ ())
108− gindex = const
109−
110−
111−instance Representable f (K1 i a) where
112− gtabulate = id
113− gindex = id
114−
115−
116−type GConstructable
117− :: (Type -> Exp Constraint)
118− -> (Type -> Exp K.HTable)
119− -> (Type -> Exp Type)
120− -> K.Context -> (Type -> Type) -> Constraint
121−class GConstructable _Table _Columns f context rep where
122− gconstruct :: ()
123− => ToColumns _Table _Columns f context
124− -> GFields f rep
125− -> GColumns _Columns rep context
126− gdeconstruct :: ()
127− => FromColumns _Table _Columns f context
128− -> GColumns _Columns rep context
129− -> GFields f rep
130−
131−
132−instance (GConstructable _Table _Columns f context rep) =>
133− GConstructable _Table _Columns f context (M1 D meta rep)
134− where
135− gconstruct = gconstruct @_Table @_Columns @f @context @rep
136− gdeconstruct = gdeconstruct @_Table @_Columns @f @context @rep
137−
138−
139−instance (GConstructable _Table _Columns f context rep) =>
140− GConstructable _Table _Columns f context (M1 C meta rep)
141− where
142− gconstruct = gconstruct @_Table @_Columns @f @context @rep
143− gdeconstruct = gdeconstruct @_Table @_Columns @f @context @rep
144−
145−
146−instance
147− ( GConstructable _Table _Columns f context a
148− , GConstructable _Table _Columns f context b
149− )
150− => GConstructable _Table _Columns f context (a :*: b)
151− where
152− gconstruct toColumns (a, b) = HProduct
153− (gconstruct @_Table @_Columns @f @context @a toColumns a)
154− (gconstruct @_Table @_Columns @f @context @b toColumns b)
155− gdeconstruct fromColumns (HProduct a b) =
156− ( gdeconstruct @_Table @_Columns @f @context @a fromColumns a
157− , gdeconstruct @_Table @_Columns @f @context @b fromColumns b
158− )
159−
160−
161−instance
162− ( Eval (_Table a)
163− , meta ~ 'MetaSel ('Just label) _su _ss _ds
164− )
165− => GConstructable _Table _Columns f context (M1 S meta (K1 i a))
166− where
167− gconstruct toColumns = hlabel . toColumns (Proxy @a)
168− gdeconstruct fromColumns = fromColumns (Proxy @a) . hunlabel
src/Rel8/Generic/Map.hsdeleted−49
@@ -1,49 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language StandaloneKindSignatures #-}
3−{-# language TypeFamilies #-}
4−{-# language TypeOperators #-}
5−{-# language UndecidableInstances #-}
6−
7−module Rel8.Generic.Map
8− ( GMap
9− , Map
10− )
11−where
12−
13−-- base
14−import Data.Kind ( Type )
15−import GHC.Generics
16− ( (:+:), (:*:), K1, M1, U1, V1
17− )
18−import Prelude ()
19−
20−-- rel8
21−import Rel8.FCF ( Eval, Exp )
22−
23−
24−type GMap :: (Type -> Exp Type) -> (Type -> Type) -> Type -> Type
25−type family GMap f rep where
26− GMap f (M1 i c rep) = M1 i c (GMap f rep)
27− GMap _ V1 = V1
28− GMap f (rep1 :+: rep2) = GMap f rep1 :+: GMap f rep2
29− GMap _ U1 = U1
30− GMap f (rep1 :*: rep2) = GMap f rep1 :*: GMap f rep2
31− GMap f (K1 i a) = K1 i (Eval (f a))
32−
33−
34−-- | Map a @Type -> Type@ function over the @Type@-kinded type variables in
35−-- of a type constructor.
36−type Map :: (Type -> Exp Type) -> Type -> Type
37−type family Map f a where
38− Map p (t a b c d e f g) =
39− t (Eval (p a)) (Eval (p b)) (Eval (p c)) (Eval (p d)) (Eval (p e))
40− (Eval (p f)) (Eval (p g))
41− Map p (t a b c d e f) =
42− t (Eval (p a)) (Eval (p b)) (Eval (p c)) (Eval (p d)) (Eval (p e))
43− (Eval (p f))
44− Map p (t a b c d e) =
45− t (Eval (p a)) (Eval (p b)) (Eval (p c)) (Eval (p d)) (Eval (p e))
46− Map p (t a b c d) = t (Eval (p a)) (Eval (p b)) (Eval (p c)) (Eval (p d))
47− Map p (t a b c) = t (Eval (p a)) (Eval (p b)) (Eval (p c))
48− Map p (t a b) = t (Eval (p a)) (Eval (p b))
49− Map p (t a) = t (Eval (p a))
src/Rel8/Generic/Record.hsdeleted−155
@@ -1,155 +0,0 @@
1−{-# language AllowAmbiguousTypes #-}
2−{-# language DataKinds #-}
3−{-# language FlexibleContexts #-}
4−{-# language FlexibleInstances #-}
5−{-# language MultiParamTypeClasses #-}
6−{-# language PolyKinds #-}
7−{-# language ScopedTypeVariables #-}
8−{-# language StandaloneKindSignatures #-}
9−{-# language TypeApplications #-}
10−{-# language TypeFamilies #-}
11−{-# language TypeOperators #-}
12−{-# language UndecidableInstances #-}
13−
14−module Rel8.Generic.Record
15− ( Record(..)
16− , GRecordable, GRecord, grecord, gunrecord
17− )
18−where
19−
20−-- base
21−import Data.Kind ( Constraint, Type )
22−import GHC.Generics
23− ( Generic, Rep, from, to
24− , (:+:)( L1, R1 ), (:*:)( (:*:) ), M1( M1 )
25− , Meta( MetaCons, MetaSel ), D, C, S
26− )
27−import GHC.TypeLits ( type (+), AppendSymbol, Div, Mod, Nat, Symbol )
28−import Prelude hiding ( Show )
29−
30−
31−type GRecord :: (Type -> Type) -> Type -> Type
32−type family GRecord rep where
33− GRecord (M1 D meta rep) = M1 D meta (GRecord rep)
34− GRecord (l :+: r) = GRecord l :+: GRecord r
35− GRecord (M1 C ('MetaCons name fixity 'False) rep) =
36− M1 C ('MetaCons name fixity 'True) (Snd (Count 0 rep))
37− GRecord rep = rep
38−
39−
40−type Count :: Nat -> (Type -> Type) -> (Nat, Type -> Type)
41−type family Count n rep where
42− Count n (M1 S ('MetaSel _selector su ss ds) rep) =
43− '(n + 1, M1 S ('MetaSel ('Just (Show (n + 1))) su ss ds) rep)
44− Count n (a :*: b) = CountHelper1 (Count n a) b
45− Count n rep = '(n, rep)
46−
47−
48−type CountHelper1 :: (Nat, Type -> Type) -> (Type -> Type) -> (Nat, Type -> Type)
49−type family CountHelper1 tuple b where
50− CountHelper1 '(n, a) b = CountHelper2 a (Count n b)
51−
52−
53−type CountHelper2 :: (Type -> Type) -> (Nat, Type -> Type) -> (Nat, Type -> Type)
54−type family CountHelper2 a tuple where
55− CountHelper2 a '(n, b) = '(n, a :*: b)
56−
57−
58−type Show :: Nat -> Symbol
59−type Show n =
60− AppendSymbol "_" (AppendSymbol (Show' (Div n 10)) (ShowDigit (Mod n 10)))
61−
62−
63−type Show' :: Nat -> Symbol
64−type family Show' n where
65− Show' 0 = ""
66− Show' n = AppendSymbol (Show' (Div n 10)) (ShowDigit (Mod n 10))
67−
68−
69−type ShowDigit :: Nat -> Symbol
70−type family ShowDigit n where
71− ShowDigit 0 = "0"
72− ShowDigit 1 = "1"
73− ShowDigit 2 = "2"
74− ShowDigit 3 = "3"
75− ShowDigit 4 = "4"
76− ShowDigit 5 = "5"
77− ShowDigit 6 = "6"
78− ShowDigit 7 = "7"
79− ShowDigit 8 = "8"
80− ShowDigit 9 = "9"
81−
82−
83−type Snd :: (a, b) -> b
84−type family Snd tuple where
85− Snd '(_a, b) = b
86−
87−
88−type GRecordable :: (Type -> Type) -> Constraint
89−class GRecordable rep where
90− grecord :: rep x -> GRecord rep x
91− gunrecord :: GRecord rep x -> rep x
92−
93−
94−instance GRecordable rep => GRecordable (M1 D meta rep) where
95− grecord (M1 a) = M1 (grecord a)
96− gunrecord (M1 a) = M1 (gunrecord a)
97−
98−
99−instance (GRecordable l, GRecordable r) => GRecordable (l :+: r) where
100− grecord (L1 a) = L1 (grecord a)
101− grecord (R1 a) = R1 (grecord a)
102− gunrecord (L1 a) = L1 (gunrecord a)
103− gunrecord (R1 a) = R1 (gunrecord a)
104−
105−
106−instance Countable 0 rep =>
107− GRecordable (M1 C ('MetaCons name fixity 'False) rep)
108− where
109− grecord (M1 a) = M1 (count @0 a)
110− gunrecord (M1 a) = M1 (uncount @0 a)
111−
112−
113−instance {-# OVERLAPPABLE #-} GRecord rep ~ rep => GRecordable rep where
114− grecord = id
115− gunrecord = id
116−
117−
118−type Countable :: Nat -> (Type -> Type) -> Constraint
119−class Countable n rep where
120− count :: rep x -> Snd (Count n rep) x
121− uncount :: Snd (Count n rep) x -> rep x
122−
123−
124−instance Countable n (M1 S ('MetaSel selector su ss ds) rep) where
125− count (M1 a) = M1 a
126− uncount (M1 a) = M1 a
127−
128−
129−instance
130− ( Countable n a, Countable n' b
131− , '(n', a') ~ Count n a
132− , Snd (CountHelper2 a' (Count n' b)) ~ (a' :*: Snd (Count n' b))
133− )
134− => Countable n (a :*: b)
135− where
136− count (a :*: b) = count @n a :*: count @n' b
137− uncount (a :*: b) = uncount @n a :*: uncount @n' b
138−
139−
140−instance {-# OVERLAPPABLE #-} Snd (Count n rep) ~ rep => Countable n rep where
141− count = id
142− uncount = id
143−
144−
145−type Record :: Type -> Type
146−newtype Record a = Record
147− { unrecord :: a
148− }
149−
150−
151−instance (Generic a, GRecordable (Rep a)) => Generic (Record a) where
152− type Rep (Record a) = GRecord (Rep a)
153−
154− from (Record a) = grecord (from a)
155− to = Record . to . gunrecord
src/Rel8/Generic/Rel8able.hsdeleted−281
@@ -1,281 +0,0 @@
1−{-# language AllowAmbiguousTypes #-}
2−{-# language ConstraintKinds #-}
3−{-# language DataKinds #-}
4−{-# language DefaultSignatures #-}
5−{-# language FlexibleContexts #-}
6−{-# language FlexibleInstances #-}
7−{-# language LambdaCase #-}
8−{-# language MultiParamTypeClasses #-}
9−{-# language PolyKinds #-}
10−{-# language QuantifiedConstraints #-}
11−{-# language ScopedTypeVariables #-}
12−{-# language StandaloneKindSignatures #-}
13−{-# language TypeApplications #-}
14−{-# language TypeFamilyDependencies #-}
15−{-# language TypeOperators #-}
16−{-# language UndecidableInstances #-}
17−
18−module Rel8.Generic.Rel8able
19− ( KRel8able, Rel8able
20− , Algebra
21− , GRep
22− , GColumns, gfromColumns, gtoColumns
23− , GFromExprs, gfromResult, gtoResult
24− , TSerialize, serialize, deserialize
25− )
26−where
27−
28−-- base
29−import Data.Functor.Identity ( Identity )
30−import Data.Kind ( Constraint, Type )
31−import Data.Type.Bool ( type (&&) )
32−import GHC.Generics ( Generic, Rep, from, to )
33−import Prelude
34−
35−-- rel8
36−import Rel8.Aggregate ( Aggregate )
37−import Rel8.Expr ( Expr )
38−import Rel8.FCF ( Exp, Eval )
39−import Rel8.Generic.Record ( Record(..) )
40−import Rel8.Generic.Table ( GAlgebra )
41−import qualified Rel8.Generic.Table.Record as G
42−import qualified Rel8.Kind.Algebra as K ( Algebra(..) )
43−import Rel8.Kind.Context ( SContext(..) )
44−import Rel8.Schema.Field ( Field )
45−import Rel8.Schema.HTable ( HTable )
46−import qualified Rel8.Schema.Kind as K
47−import Rel8.Schema.Name ( Name )
48−import Rel8.Schema.Result ( Result )
49−import Rel8.Table
50− ( Table, Columns, Context, fromColumns, toColumns
51− , FromExprs, fromResult, toResult
52− , Transpose
53− , TTable, TColumns
54− )
55−import Rel8.Table.Transpose ( Transposes )
56−
57−
58−-- | The kind of 'Rel8able' types
59−type KRel8able :: Type
60−type KRel8able = K.Rel8able
61−
62−
63−-- This is almost 'Data.Type.Equality.==', but we add an extra case.
64−type (==) :: k -> k -> Bool
65−type family a == b where
66− -- This extra case is needed to solve the equation "a == a" (where a is a
67− -- KRel8able), which occurs when we have polymorphic Rel8ables
68− -- (e.g., newtype T t f = T { x :: t a })
69− (a :: KRel8able) == (a :: KRel8able) = 'True
70−
71− -- This extra case is needed to solve the equation "a == Identity a",
72− -- which occurs when we have polymorphic Rel8ables
73− -- (e.g., newtype T a f = T { x :: Column f a })
74− a == Identity a = 'False
75−
76− -- These cases are exactly the same as those in 'Data.Type.Equality.==.
77− f a == g b = f == g && a == b
78− a == a = 'True
79− _ == _ = 'False
80−
81−
82−type Serialize :: Bool -> Type -> Type -> Constraint
83−class transposition ~ (a == Transpose Result expr) =>
84− Serialize transposition expr a
85− where
86− serialize :: a -> Columns expr Result
87− deserialize :: Columns expr Result -> a
88−
89−
90−instance
91− ( (a == Transpose Result expr) ~ 'True
92− , Transposes Expr Result expr a
93− )
94− => Serialize 'True expr a
95− where
96− serialize = toColumns
97− deserialize = fromColumns
98−
99−
100−instance
101− ( (a == Transpose Result expr) ~ 'False
102− , Table (Context expr) expr
103− , FromExprs expr ~ a
104− )
105− => Serialize 'False expr a
106− where
107− serialize = toResult @_ @expr
108− deserialize = fromResult @_ @expr
109−
110−
111−data TSerialize :: Type -> Type -> Exp Constraint
112−type instance Eval (TSerialize expr a) =
113− Serialize (a == Transpose Result expr) expr a
114−
115−
116−-- | This type class allows you to define custom 'Table's using higher-kinded
117−-- data types. Higher-kinded data types are data types of the pattern:
118−--
119−-- @
120−-- data MyType f =
121−-- MyType { field1 :: Column f T1 OR HK1 f
122−-- , field2 :: Column f T2 OR HK2 f
123−-- , ...
124−-- , fieldN :: Column f Tn OR HKn f
125−-- }
126−-- @
127−--
128−-- where @Tn@ is any Haskell type, and @HKn@ is any higher-kinded type.
129−--
130−-- That is, higher-kinded data are records where all fields in the record are
131−-- all either of the type @Column f T@ (for any @T@), or are themselves
132−-- higher-kinded data:
133−--
134−-- [Nested]
135−--
136−-- @
137−-- data Nested f =
138−-- Nested { nested1 :: MyType f
139−-- , nested2 :: MyType f
140−-- }
141−-- @
142−--
143−-- The @Rel8able@ type class is used to give us a special mapping operation
144−-- that lets us change the type parameter @f@.
145−--
146−-- [Supplying @Rel8able@ instances]
147−--
148−-- This type class should be derived generically for all table types in your
149−-- project. To do this, enable the @DeriveAnyClass@ and @DeriveGeneric@ language
150−-- extensions:
151−--
152−-- @
153−-- \{\-\# LANGUAGE DeriveAnyClass, DeriveGeneric #-\}
154−--
155−-- data MyType f = MyType { fieldA :: Column f T }
156−-- deriving ( GHC.Generics.Generic, Rel8able )
157−-- @
158−type Rel8able :: K.Rel8able -> Constraint
159−class HTable (GColumns t) => Rel8able t where
160− type GColumns t :: K.HTable
161− type GFromExprs t :: Type
162−
163− gfromColumns :: SContext context -> GColumns t context -> t context
164− gtoColumns :: SContext context -> t context -> GColumns t context
165−
166− gfromResult :: GColumns t Result -> GFromExprs t
167− gtoResult :: GFromExprs t -> GColumns t Result
168−
169− type GColumns t = G.GColumns TColumns (GRep t Expr)
170− type GFromExprs t = t Result
171−
172− default gfromColumns :: forall context.
173− ( SRel8able t Aggregate
174− , SRel8able t Expr
175− , forall table. SRel8able t (Field table)
176− , SRel8able t Name
177− , SSerialize t
178− )
179− => SContext context -> GColumns t context -> t context
180− gfromColumns = \case
181− SAggregate -> sfromColumns
182− SExpr -> sfromColumns
183− SField -> sfromColumns
184− SName -> sfromColumns
185− SResult -> sfromResult
186−
187− default gtoColumns :: forall context.
188− ( SRel8able t Aggregate
189− , SRel8able t Expr
190− , forall table. SRel8able t (Field table)
191− , SRel8able t Name
192− , SSerialize t
193− )
194− => SContext context -> t context -> GColumns t context
195− gtoColumns = \case
196− SAggregate -> stoColumns
197− SExpr -> stoColumns
198− SField -> stoColumns
199− SName -> stoColumns
200− SResult -> stoResult
201−
202− default gfromResult :: (SSerialize t, GFromExprs t ~ t Result)
203− => GColumns t Result -> GFromExprs t
204− gfromResult = sfromResult
205−
206− default gtoResult :: (SSerialize t, GFromExprs t ~ t Result)
207− => GFromExprs t -> GColumns t Result
208− gtoResult = stoResult
209−
210−
211−type Algebra :: K.Rel8able -> K.Algebra
212−type Algebra t = GAlgebra (GRep t Expr)
213−
214−
215−type GRep :: K.Rel8able -> K.Context -> Type -> Type
216−type GRep t context = Rep (Record (t context))
217−
218−
219−type SRel8able :: K.Rel8able -> K.Context -> Constraint
220−class
221− ( Generic (Record (t context))
222− , G.GTable (TTable context) TColumns (GRep t context)
223− , G.GColumns TColumns (GRep t context) ~ GColumns t
224− )
225− => SRel8able t context
226−instance
227− ( Generic (Record (t context))
228− , G.GTable (TTable context) TColumns (GRep t context)
229− , G.GColumns TColumns (GRep t context) ~ GColumns t
230− )
231− => SRel8able t context
232−
233−
234−type SSerialize :: K.Rel8able -> Constraint
235−type SSerialize t =
236− ( Generic (Record (t Result))
237− , G.GSerialize TSerialize TColumns (GRep t Expr) (GRep t Result)
238− , G.GColumns TColumns (GRep t Expr) ~ GColumns t
239− )
240−
241−
242−sfromColumns :: forall t context. SRel8able t context
243− => GColumns t context -> t context
244−sfromColumns =
245− unrecord .
246− to .
247− G.gfromColumns @(TTable context) @TColumns fromColumns
248−
249−
250−stoColumns :: forall t context. SRel8able t context
251− => t context -> GColumns t context
252−stoColumns =
253− G.gtoColumns @(TTable context) @TColumns toColumns .
254− from .
255− Record
256−
257−
258−sfromResult :: forall t. SSerialize t
259− => GColumns t Result -> t Result
260−sfromResult =
261− unrecord .
262− to .
263− G.gfromResult
264− @TSerialize
265− @TColumns
266− @(GRep t Expr)
267− @(GRep t Result)
268− (\(_ :: proxy x) -> deserialize @_ @x)
269−
270−
271−stoResult :: forall t. SSerialize t
272− => t Result -> GColumns t Result
273−stoResult =
274− G.gtoResult
275− @TSerialize
276− @TColumns
277− @(GRep t Expr)
278− @(GRep t Result)
279− (\(_ :: proxy x) -> serialize @_ @x) .
280− from .
281− Record
src/Rel8/Generic/Table.hsdeleted−103
@@ -1,103 +0,0 @@
1−{-# language AllowAmbiguousTypes #-}
2−{-# language DataKinds #-}
3−{-# language FlexibleContexts #-}
4−{-# language FlexibleInstances #-}
5−{-# language MultiParamTypeClasses #-}
6−{-# language RankNTypes #-}
7−{-# language ScopedTypeVariables #-}
8−{-# language StandaloneKindSignatures #-}
9−{-# language TypeApplications #-}
10−{-# language TypeFamilies #-}
11−{-# language TypeOperators #-}
12−{-# language UndecidableInstances #-}
13−
14−module Rel8.Generic.Table
15− ( GGSerialize, GGColumns, ggfromResult, ggtoResult
16− , GAlgebra
17− )
18−where
19−
20−-- base
21−import Data.Kind ( Constraint, Type )
22−import GHC.Generics ( (:+:), (:*:), K1, M1, U1, V1 )
23−import Prelude ()
24−
25−-- rel8
26−import Rel8.FCF ( Eval, Exp )
27−import Rel8.Generic.Table.ADT
28− ( GSerializeADT, GColumnsADT, gtoResultADT, gfromResultADT
29− )
30−import Rel8.Generic.Table.Record ( GSerialize, GColumns, gtoResult, gfromResult )
31−import Rel8.Kind.Algebra
32− ( Algebra( Product, Sum )
33− , SAlgebra( SProduct, SSum )
34− , KnownAlgebra, algebraSing
35− )
36−import qualified Rel8.Schema.Kind as K
37−import Rel8.Schema.Result ( Result )
38−
39−
40−data GGSerialize
41− :: Algebra
42− -> (Type -> Type -> Exp Constraint)
43− -> (Type -> Exp K.HTable)
44− -> (Type -> Type)
45− -> (Type -> Type)
46− -> Exp Constraint
47−
48−
49−type instance Eval (GGSerialize 'Product _Serialize _Columns exprs rep) =
50− GSerialize _Serialize _Columns exprs rep
51−
52−
53−type instance Eval (GGSerialize 'Sum _Serialize _Columns exprs rep) =
54− GSerializeADT _Serialize _Columns exprs rep
55−
56−
57−data GGColumns
58− :: Algebra
59− -> (Type -> Exp K.HTable)
60− -> (Type -> Type)
61− -> Exp K.HTable
62−
63−
64−type instance Eval (GGColumns 'Product _Columns rep) = GColumns _Columns rep
65−
66−
67−type instance Eval (GGColumns 'Sum _Columns rep) = GColumnsADT _Columns rep
68−
69−
70−type GAlgebra :: (Type -> Type) -> Algebra
71−type family GAlgebra rep where
72− GAlgebra (M1 _ _ rep) = GAlgebra rep
73− GAlgebra V1 = 'Sum
74− GAlgebra (_ :+: _) = 'Sum
75− GAlgebra U1 = 'Sum
76− GAlgebra (_ :*: _) = 'Product
77− GAlgebra (K1 _ _) = 'Product
78−
79−
80−ggfromResult :: forall algebra _Serialize _Columns exprs rep x.
81− ( KnownAlgebra algebra
82− , Eval (GGSerialize algebra _Serialize _Columns exprs rep)
83− )
84− => (forall expr a proxy. Eval (_Serialize expr a)
85− => proxy expr -> Eval (_Columns expr) Result -> a)
86− -> Eval (GGColumns algebra _Columns exprs) Result
87− -> rep x
88−ggfromResult f x = case algebraSing @algebra of
89− SProduct -> gfromResult @_Serialize @_Columns @exprs @rep f x
90− SSum -> gfromResultADT @_Serialize @_Columns @exprs @rep f x
91−
92−
93−ggtoResult :: forall algebra _Serialize _Columns exprs rep x.
94− ( KnownAlgebra algebra
95− , Eval (GGSerialize algebra _Serialize _Columns exprs rep)
96− )
97− => (forall expr a proxy. Eval (_Serialize expr a)
98− => proxy expr -> a -> Eval (_Columns expr) Result)
99− -> rep x
100− -> Eval (GGColumns algebra _Columns exprs) Result
101−ggtoResult f x = case algebraSing @algebra of
102− SProduct -> gtoResult @_Serialize @_Columns @exprs @rep f x
103− SSum -> gtoResultADT @_Serialize @_Columns @exprs @rep f x
src/Rel8/Generic/Table/ADT.hsdeleted−221
@@ -1,221 +0,0 @@
1−{-# language AllowAmbiguousTypes #-}
2−{-# language DataKinds #-}
3−{-# language FlexibleContexts #-}
4−{-# language FlexibleInstances #-}
5−{-# language LambdaCase #-}
6−{-# language MultiParamTypeClasses #-}
7−{-# language RankNTypes #-}
8−{-# language ScopedTypeVariables #-}
9−{-# language StandaloneKindSignatures #-}
10−{-# language TypeApplications #-}
11−{-# language TypeFamilies #-}
12−{-# language TypeOperators #-}
13−{-# language UndecidableInstances #-}
14−
15−module Rel8.Generic.Table.ADT
16− ( GSerializeADT, GColumnsADT, gfromResultADT, gtoResultADT
17− , GSerializeADT', GColumnsADT'
18− )
19−where
20−
21−-- base
22−import Data.Functor.Identity ( Identity( Identity ) )
23−import Data.Kind ( Constraint, Type )
24−import Data.Proxy ( Proxy( Proxy ) )
25−import GHC.Generics
26− ( (:+:)( L1, R1 ), M1( M1 ), U1( U1 )
27− , C, D
28− , Meta( MetaCons )
29− )
30−import GHC.TypeLits ( KnownSymbol, symbolVal )
31−import Prelude hiding ( null )
32−
33−-- rel8
34−import Rel8.FCF ( Eval, Exp )
35−import Rel8.Generic.Table.Record ( GSerialize, GColumns, gfromResult, gtoResult )
36−import Rel8.Schema.HTable ( HTable )
37−import Rel8.Schema.HTable.Identity ( HIdentity( HIdentity ) )
38−import Rel8.Schema.HTable.Label ( HLabel, hlabel, hunlabel )
39−import Rel8.Schema.HTable.Nullify ( HNullify, hnulls, hnullify, hunnullify )
40−import Rel8.Schema.HTable.Product ( HProduct( HProduct ) )
41−import qualified Rel8.Schema.Kind as K
42−import Rel8.Schema.Result ( Result, null, nullifier, unnullifier )
43−import Rel8.Type.Tag ( Tag( Tag ) )
44−
45−-- text
46−import Data.Text ( pack )
47−
48−
49−type GColumnsADT
50− :: (Type -> Exp K.HTable)
51− -> (Type -> Type) -> K.HTable
52−type family GColumnsADT _Columns rep where
53− GColumnsADT _Columns (M1 D _ rep) =
54− GColumnsADT' _Columns (HLabel "tag" (HIdentity Tag)) rep
55−
56−
57−type GColumnsADT'
58− :: (Type -> Exp K.HTable)
59− -> K.HTable -> (Type -> Type) -> K.HTable
60−type family GColumnsADT' _Columns htable rep where
61− GColumnsADT' _Columns htable (a :+: b) =
62− GColumnsADT' _Columns (GColumnsADT' _Columns htable a) b
63− GColumnsADT' _Columns htable (M1 C ('MetaCons _ _ _) U1) = htable
64− GColumnsADT' _Columns htable (M1 C ('MetaCons label _ _) rep) =
65− HProduct htable (HLabel label (HNullify (GColumns _Columns rep)))
66−
67−
68−type GSerializeADT
69− :: (Type -> Type -> Exp Constraint)
70− -> (Type -> Exp K.HTable)
71− -> (Type -> Type) -> (Type -> Type) -> Constraint
72−class GSerializeADT _Serialize _Columns exprs rep where
73− gfromResultADT :: ()
74− => (forall expr a proxy. Eval (_Serialize expr a)
75− => proxy expr -> Eval (_Columns expr) Result -> a)
76− -> GColumnsADT _Columns exprs Result
77− -> rep x
78−
79− gtoResultADT :: ()
80− => (forall expr a proxy. Eval (_Serialize expr a)
81− => proxy expr -> a -> Eval (_Columns expr) Result)
82− -> rep x
83− -> GColumnsADT _Columns exprs Result
84−
85−
86−instance
87− ( htable ~ HLabel "tag" (HIdentity Tag)
88− , GSerializeADT' _Serialize _Columns htable exprs rep
89− )
90− => GSerializeADT _Serialize _Columns (M1 D meta exprs) (M1 D meta rep)
91− where
92− gfromResultADT fromResult columns =
93− case gfromResultADT' @_Serialize @_Columns @htable @exprs @rep fromResult tag columns of
94− Just rep -> M1 rep
95− _ -> error "ADT.fromColumns: mismatch between tag and data"
96− where
97− tag = (\(HIdentity (Identity a)) -> a) . hunlabel @"tag"
98−
99− gtoResultADT toResult (M1 rep) =
100− gtoResultADT' @_Serialize @_Columns @htable @exprs @rep toResult tag (Just rep)
101− where
102− tag = hlabel @"tag" . HIdentity . Identity
103−
104−
105−type GSerializeADT'
106− :: (Type -> Type -> Exp Constraint)
107− -> (Type -> Exp K.HTable)
108− -> K.HTable -> (Type -> Type) -> (Type -> Type) -> Constraint
109−class GSerializeADT' _Serialize _Columns htable exprs rep where
110− gfromResultADT' :: context ~ Result
111− => (forall expr a proxy. Eval (_Serialize expr a)
112− => proxy expr -> Eval (_Columns expr) context -> a)
113− -> (htable Result -> Tag)
114− -> GColumnsADT' _Columns htable exprs context
115− -> Maybe (rep x)
116−
117− gtoResultADT' :: context ~ Result
118− => (forall expr a proxy. Eval (_Serialize expr a)
119− => proxy expr -> a -> Eval (_Columns expr) context)
120− -> (Tag -> htable Result)
121− -> Maybe (rep x)
122− -> GColumnsADT' _Columns htable exprs context
123−
124− extract :: GColumnsADT' _Columns htable exprs context -> htable context
125−
126−
127−instance
128− ( htable' ~ GColumnsADT' _Columns htable exprs1
129− , GSerializeADT' _Serialize _Columns htable exprs1 a
130− , GSerializeADT' _Serialize _Columns htable' exprs2 b
131− )
132− => GSerializeADT' _Serialize _Columns htable (exprs1 :+: exprs2) (a :+: b)
133− where
134− gfromResultADT' fromResult f columns =
135− case ma of
136− Just a -> Just (L1 a)
137− Nothing -> R1 <$>
138− gfromResultADT' @_Serialize @_Columns @_ @exprs2 @b
139− fromResult
140− (f . extract @_Serialize @_Columns @_ @exprs1 @a)
141− columns
142− where
143− ma =
144− gfromResultADT' @_Serialize @_Columns @_ @exprs1 @a
145− fromResult
146− f
147− (extract @_Serialize @_Columns @_ @exprs2 @b columns)
148−
149− gtoResultADT' toResult tag = \case
150− Just (L1 a) ->
151− gtoResultADT' @_Serialize @_Columns @_ @exprs2 @b
152− toResult
153− (\_ -> gtoResultADT' @_Serialize @_Columns @_ @exprs1 @a
154− toResult
155− tag
156− (Just a))
157− Nothing
158− Just (R1 b) ->
159− gtoResultADT' @_Serialize @_Columns @_ @exprs2 @b
160− toResult
161− (\tag' ->
162− gtoResultADT' @_Serialize @_Columns @_ @exprs1 @a
163− toResult
164− (\_ -> tag tag')
165− Nothing)
166− (Just b)
167− Nothing ->
168− gtoResultADT' @_Serialize @_Columns @_ @exprs2 @b
169− toResult
170− (\_ -> gtoResultADT' @_Serialize @_Columns @_ @exprs1 @a toResult tag Nothing)
171− Nothing
172−
173− extract =
174− extract @_Serialize @_Columns @_ @exprs1 @a .
175− extract @_Serialize @_Columns @_ @exprs2 @b
176−
177−
178−instance (meta ~ 'MetaCons label _fixity _isRecord, KnownSymbol label) =>
179− GSerializeADT' _Serialize _Columns _htable (M1 C meta U1) (M1 C meta U1)
180− where
181− gfromResultADT' _ tag columns
182− | tag columns == tag' = Just (M1 U1)
183− | otherwise = Nothing
184− where
185− tag' = Tag $ pack $ symbolVal (Proxy @label)
186−
187− gtoResultADT' _ tag _ = tag tag'
188− where
189− tag' = Tag $ pack $ symbolVal (Proxy @label)
190−
191− extract = id
192−
193−
194−instance {-# OVERLAPPABLE #-}
195− ( HTable (GColumns _Columns exprs)
196− , GSerialize _Serialize _Columns exprs rep
197− , meta ~ 'MetaCons label _fixity _isRecord
198− , KnownSymbol label
199− , GColumnsADT' _Columns htable (M1 C ('MetaCons label _fixity _isRecord) exprs) ~
200− HProduct htable (HLabel label (HNullify (GColumns _Columns exprs)))
201− )
202− => GSerializeADT' _Serialize _Columns htable (M1 C meta exprs) (M1 C meta rep)
203− where
204− gfromResultADT' fromResult tag (HProduct a b)
205− | tag a == tag' =
206− M1 . gfromResult @_Serialize @_Columns @exprs @rep fromResult <$>
207− hunnullify unnullifier (hunlabel b)
208− | otherwise = Nothing
209− where
210− tag' = Tag $ pack $ symbolVal (Proxy @label)
211−
212− gtoResultADT' toResult tag = \case
213− Nothing -> HProduct (tag tag') (hlabel (hnulls (const null)))
214− Just (M1 rep) -> HProduct (tag tag') $
215− hlabel $
216− hnullify nullifier $
217− gtoResult @_Serialize @_Columns @exprs @rep toResult rep
218− where
219− tag' = Tag $ pack $ symbolVal (Proxy @label)
220−
221− extract (HProduct a _) = a
src/Rel8/Generic/Table/Record.hsdeleted−181
@@ -1,181 +0,0 @@
1−{-# language AllowAmbiguousTypes #-}
2−{-# language DataKinds #-}
3−{-# language FlexibleContexts #-}
4−{-# language FlexibleInstances #-}
5−{-# language MultiParamTypeClasses #-}
6−{-# language PolyKinds #-}
7−{-# language RankNTypes #-}
8−{-# language ScopedTypeVariables #-}
9−{-# language StandaloneKindSignatures #-}
10−{-# language TypeApplications #-}
11−{-# language TypeFamilies #-}
12−{-# language TypeOperators #-}
13−{-# language UndecidableInstances #-}
14−
15−module Rel8.Generic.Table.Record
16− ( GTable, GColumns, GContext, gfromColumns, gtoColumns, gtable
17− , GSerialize, gfromResult, gtoResult
18− )
19−where
20−
21−-- base
22−import Data.Kind ( Constraint, Type )
23−import Data.Proxy ( Proxy( Proxy ) )
24−import GHC.Generics
25− ( (:*:)( (:*:) ), K1( K1 ), M1( M1 )
26− , C, D, S
27− , Meta( MetaSel )
28− )
29−import Prelude hiding ( null )
30−
31−-- rel8
32−import Rel8.FCF ( Eval, Exp )
33−import Rel8.Schema.HTable.Label ( HLabel, hlabel, hunlabel )
34−import Rel8.Schema.HTable.Product ( HProduct(..) )
35−import qualified Rel8.Schema.Kind as K
36−
37−
38−type GColumns :: (Type -> Exp K.HTable) -> (Type -> Type) -> K.HTable
39−type family GColumns _Columns rep where
40− GColumns _Columns (M1 D _ rep) = GColumns _Columns rep
41− GColumns _Columns (M1 C _ rep) = GColumns _Columns rep
42− GColumns _Columns (rep1 :*: rep2) =
43− HProduct (GColumns _Columns rep1) (GColumns _Columns rep2)
44− GColumns _Columns (M1 S ('MetaSel ('Just label) _ _ _) (K1 _ a)) =
45− HLabel label (Eval (_Columns a))
46−
47−
48−type GContext :: (Type -> Exp K.Context) -> (Type -> Type) -> K.Context
49−type family GContext _Context rep where
50− GContext _Context (M1 _ _ rep) = GContext _Context rep
51− GContext _Context (rep1 :*: _rep2) = GContext _Context rep1
52− GContext _Context (K1 _ a) = Eval (_Context a)
53−
54−
55−type GTable
56− :: (Type -> Exp Constraint)
57− -> (Type -> Exp K.HTable)
58− -> (Type -> Type) -> Constraint
59−class GTable _Table _Columns rep
60− where
61− gfromColumns :: ()
62− => (forall a. Eval (_Table a) => Eval (_Columns a) context -> a)
63− -> GColumns _Columns rep context
64− -> rep x
65−
66− gtoColumns :: ()
67− => (forall a. Eval (_Table a) => a -> Eval (_Columns a) context)
68− -> rep x
69− -> GColumns _Columns rep context
70−
71− gtable :: ()
72− => (forall a proxy. Eval (_Table a) => proxy a -> Eval (_Columns a) context)
73− -> GColumns _Columns rep context
74−
75−
76−type GSerialize
77− :: (Type -> Type -> Exp Constraint)
78− -> (Type -> Exp K.HTable)
79− -> (Type -> Type) -> (Type -> Type) -> Constraint
80−class GSerialize _Serialize _Columns exprs rep
81− where
82− gfromResult :: ()
83− => (forall expr a proxy. Eval (_Serialize expr a)
84− => proxy expr -> Eval (_Columns expr) context -> a)
85− -> GColumns _Columns exprs context
86− -> rep x
87−
88− gtoResult :: ()
89− => (forall expr a proxy. Eval (_Serialize expr a)
90− => proxy expr -> a -> Eval (_Columns expr) context)
91− -> rep x
92− -> GColumns _Columns exprs context
93−
94−
95−instance GTable _Table _Columns rep => GTable _Table _Columns (M1 D c rep)
96− where
97− gfromColumns fromColumns =
98− M1 . gfromColumns @_Table @_Columns @rep fromColumns
99− gtoColumns toColumns (M1 a) =
100− gtoColumns @_Table @_Columns @rep toColumns a
101− gtable = gtable @_Table @_Columns @rep
102−
103−
104−instance GSerialize _Serialize _Columns exprs rep =>
105− GSerialize _Serialize _Columns (M1 D c exprs) (M1 D c rep)
106− where
107− gfromResult fromResult =
108− M1 . gfromResult @_Serialize @_Columns @exprs @rep fromResult
109− gtoResult toResult (M1 a) =
110− gtoResult @_Serialize @_Columns @exprs @rep toResult a
111−
112−
113−instance GTable _Table _Columns rep => GTable _Table _Columns (M1 C c rep)
114− where
115− gfromColumns fromColumns =
116− M1 . gfromColumns @_Table @_Columns @rep fromColumns
117− gtoColumns toColumns (M1 a) =
118− gtoColumns @_Table @_Columns @rep toColumns a
119− gtable = gtable @_Table @_Columns @rep
120−
121−
122−instance GSerialize _Serialize _Columns exprs rep =>
123− GSerialize _Serialize _Columns (M1 C c exprs) (M1 C c rep)
124− where
125− gfromResult fromResult =
126− M1 . gfromResult @_Serialize @_Columns @exprs @rep fromResult
127− gtoResult toResult (M1 a) =
128− gtoResult @_Serialize @_Columns @exprs @rep toResult a
129−
130−
131−instance (GTable _Table _Columns rep1, GTable _Table _Columns rep2) =>
132− GTable _Table _Columns (rep1 :*: rep2)
133− where
134− gfromColumns fromColumns (HProduct a b) =
135− gfromColumns @_Table @_Columns @rep1 fromColumns a :*:
136− gfromColumns @_Table @_Columns @rep2 fromColumns b
137− gtoColumns toColumns (a :*: b) = HProduct
138− (gtoColumns @_Table @_Columns @rep1 toColumns a)
139− (gtoColumns @_Table @_Columns @rep2 toColumns b)
140− gtable table = HProduct
141− (gtable @_Table @_Columns @rep1 table)
142− (gtable @_Table @_Columns @rep2 table)
143−
144−
145−instance
146− ( GSerialize _Serialize _Columns expr1 rep1
147− , GSerialize _Serialize _Columns expr2 rep2
148− )
149− => GSerialize _Serialize _Columns (expr1 :*: expr2) (rep1 :*: rep2)
150− where
151− gfromResult fromResult (HProduct a b) =
152− gfromResult @_Serialize @_Columns @expr1 @rep1 fromResult a :*:
153− gfromResult @_Serialize @_Columns @expr2 @rep2 fromResult b
154− gtoResult toResult (a :*: b) =
155− HProduct
156− (gtoResult @_Serialize @_Columns @expr1 @rep1 toResult a)
157− (gtoResult @_Serialize @_Columns @expr2 @rep2 toResult b)
158−
159−
160−instance
161− ( Eval (_Table a)
162− , meta ~ 'MetaSel ('Just label) _su _ss _ds
163− , k1 ~ K1 i a
164− )
165− => GTable _Table _Columns (M1 S meta k1)
166− where
167− gfromColumns fromColumns = M1 . K1 . fromColumns . hunlabel
168− gtoColumns toColumns (M1 (K1 a)) = hlabel (toColumns a)
169− gtable table = hlabel (table (Proxy @a))
170−
171−
172−instance
173− ( Eval (_Serialize expr a)
174− , meta ~ 'MetaSel ('Just label) _su _ss _ds
175− , k1 ~ K1 i expr
176− , k1' ~ K1 i a
177− )
178− => GSerialize _Serialize _Columns (M1 S meta k1) (M1 S meta k1')
179− where
180− gfromResult fromResult = M1 . K1 . fromResult (Proxy @expr) . hunlabel
181− gtoResult toResult (M1 (K1 a)) = hlabel (toResult (Proxy @expr) a)
src/Rel8/Kind/Algebra.hsdeleted−38
@@ -1,38 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language FlexibleContexts #-}
3−{-# language GADTs #-}
4−{-# language StandaloneKindSignatures #-}
5−
6−module Rel8.Kind.Algebra
7− ( Algebra( Product, Sum )
8− , SAlgebra( SProduct, SSum )
9− , KnownAlgebra( algebraSing )
10− )
11−where
12−
13−-- base
14−import Data.Kind ( Constraint, Type )
15−import Prelude ()
16−
17−
18−type Algebra :: Type
19−data Algebra = Product | Sum
20−
21−
22−type SAlgebra :: Algebra -> Type
23−data SAlgebra algebra where
24− SProduct :: SAlgebra 'Product
25− SSum :: SAlgebra 'Sum
26−
27−
28−type KnownAlgebra :: Algebra -> Constraint
29−class KnownAlgebra algebra where
30− algebraSing :: SAlgebra algebra
31−
32−
33−instance KnownAlgebra 'Product where
34− algebraSing = SProduct
35−
36−
37−instance KnownAlgebra 'Sum where
38− algebraSing = SSum
src/Rel8/Kind/Context.hsdeleted−56
@@ -1,56 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language GADTs #-}
3−{-# language StandaloneKindSignatures #-}
4−{-# language TypeSynonymInstances #-}
5−
6−module Rel8.Kind.Context
7− ( Reifiable( contextSing )
8− , SContext(..)
9− )
10−where
11−
12−-- base
13−import Data.Kind ( Constraint, Type )
14−import Prelude ()
15−
16−-- rel8
17−import Rel8.Aggregate ( Aggregate )
18−import Rel8.Expr ( Expr )
19−import Rel8.Schema.Field ( Field )
20−import Rel8.Schema.Kind ( Context )
21−import Rel8.Schema.Name ( Name )
22−import Rel8.Schema.Result ( Result )
23−
24−
25−type SContext :: Context -> Type
26−data SContext context where
27− SAggregate :: SContext Aggregate
28− SExpr :: SContext Expr
29− SField :: SContext (Field table)
30− SName :: SContext Name
31− SResult :: SContext Result
32−
33−
34−type Reifiable :: Context -> Constraint
35−class Reifiable context where
36− contextSing :: SContext context
37−
38−
39−instance Reifiable Aggregate where
40− contextSing = SAggregate
41−
42−
43−instance Reifiable Expr where
44− contextSing = SExpr
45−
46−
47−instance Reifiable (Field table) where
48− contextSing = SField
49−
50−
51−instance Reifiable Result where
52− contextSing = SResult
53−
54−
55−instance Reifiable Name where
56− contextSing = SName
src/Rel8/Kind/Labels.hsnew file+61
@@ -0,0 +1,61 @@
1+{-# language DataKinds #-}
2+{-# language FlexibleContexts #-}
3+{-# language FlexibleInstances #-}
4+{-# language GADTs #-}
5+{-# language LambdaCase #-}
6+{-# language StandaloneKindSignatures #-}
7+{-# language TypeOperators #-}
8+
9+module Rel8.Kind.Labels
10+ ( Labels
11+ , SLabels( SLabel, SLabels )
12+ , KnownLabels( labelsSing )
13+ , renderLabels
14+ )
15+where
16+
17+-- base
18+import Data.Kind ( Constraint, Type )
19+import Data.List.NonEmpty ( NonEmpty( (:|) ), (<|) )
20+import Data.Proxy ( Proxy( Proxy ) )
21+import GHC.TypeLits ( KnownSymbol, Symbol, symbolVal )
22+import Prelude
23+
24+
25+type Labels :: Type
26+type Labels = [Symbol]
27+
28+
29+type SLabels :: Labels -> Type
30+data SLabels labels where
31+ SLabel :: KnownSymbol label => Proxy label -> SLabels '[label]
32+ SLabels :: KnownSymbol label => Proxy label -> SLabels labels -> SLabels (label ': labels)
33+
34+
35+type KnownLabels :: Labels -> Constraint
36+class KnownLabels labels where
37+ labelsSing :: SLabels labels
38+
39+
40+instance KnownSymbol label => KnownLabels (label ': '[]) where
41+ labelsSing = SLabel Proxy
42+
43+
44+instance (KnownSymbol label, KnownLabels (label_ ': labels)) =>
45+ KnownLabels (label ': (label_ ': labels))
46+ where
47+ labelsSing = SLabels Proxy labelsSing
48+
49+
50+renderLabels :: SLabels labels -> NonEmpty String
51+renderLabels = cleanup . go
52+ where
53+ go :: SLabels labels -> NonEmpty String
54+ go = \case
55+ SLabel label -> pure (symbolVal label)
56+ SLabels label labels -> symbolVal label <| go labels
57+
58+ cleanup ("" :| []) = "anon" :| []
59+ cleanup (a :| []) = a :| []
60+ cleanup (a :| [""]) = a :| []
61+ cleanup (a :| (b : c)) = a <| cleanup (b :| c)
src/Rel8/Kind/Necessity.hsnew file+38
@@ -0,0 +1,38 @@
1+{-# language DataKinds #-}
2+{-# language FlexibleContexts #-}
3+{-# language GADTs #-}
4+{-# language StandaloneKindSignatures #-}
5+
6+module Rel8.Kind.Necessity
7+ ( Necessity( Optional, Required )
8+ , SNecessity( SOptional, SRequired )
9+ , KnownNecessity( necessitySing )
10+ )
11+where
12+
13+-- base
14+import Data.Kind ( Constraint, Type )
15+import Prelude ()
16+
17+
18+type Necessity :: Type
19+data Necessity = Optional | Required
20+
21+
22+type SNecessity :: Necessity -> Type
23+data SNecessity necessity where
24+ SOptional :: SNecessity 'Optional
25+ SRequired :: SNecessity 'Required
26+
27+
28+type KnownNecessity :: Necessity -> Constraint
29+class KnownNecessity necessity where
30+ necessitySing :: SNecessity necessity
31+
32+
33+instance KnownNecessity 'Optional where
34+ necessitySing = SOptional
35+
36+
37+instance KnownNecessity 'Required where
38+ necessitySing = SRequired
src/Rel8/Opaque.hsnew file+15
@@ -0,0 +1,15 @@
1+{-# language PolyKinds #-}
2+{-# language StandaloneKindSignatures #-}
3+{-# language TypeFamilies #-}
4+
5+module Rel8.Opaque
6+ ( Opaque
7+ )
8+where
9+
10+-- base
11+import Prelude ()
12+
13+
14+type Opaque :: k
15+data family Opaque :: k
src/Rel8/Order.hs+14−5
@@ -16,15 +16,24 @@ import Prelude
16import Data.Functor.Contravariant.Divisible ( Decidable, Divisible )
16import Data.Functor.Contravariant.Divisible ( Decidable, Divisible )
17
17
18-- opaleye
18-- opaleye
19−import qualified Opaleye.Order as Opaleye
19+import qualified Opaleye.Internal.Order as Opaleye
20
20
21
21
22−-- | An ordering expression for @a@. Primitive orderings are defined with
22+-- | An ordering expression for @a@. Primitive orderings are defined with 'asc'
23−-- 'Rel8.asc' and 'Rel8.desc', and you can combine @Order@ via its various
23+-- and 'desc', and you can combine @Order@ via its various instances.
24−-- instances.
25--
24--
26-- A common pattern is to use '<>' to combine multiple orderings in sequence,
25-- A common pattern is to use '<>' to combine multiple orderings in sequence,
26+-- and '>$<' (from 'Contravariant') to select individual columns. For example,
27+-- to sort a @Query@ on two columns, we could do:
28+--
27−-- and 'Data.Functor.Contravariant.>$<' to select individual columns.
29+-- >>> import Data.Functor.Contravariant ((>$<))
30+-- >>> :{
31+-- select c $ orderBy (mconcat [fst >$< asc, snd >$< desc]) $ do
32+-- x <- values [ lit x | x <- [1..3 :: Int32 ] ]
33+-- y <- values [ lit x | x <- [1..3 :: Int32 ] ]
34+-- return (x, y)
35+-- :}
36+-- [(1,3),(1,2),(1,1),(2,3),(2,2),(2,1),(3,3),(3,2),(3,1)]
28type Order :: Type -> Type
37type Order :: Type -> Type
29newtype Order a = Order (Opaleye.Order a)
38newtype Order a = Order (Opaleye.Order a)
30 deriving newtype (Contravariant, Divisible, Decidable, Semigroup, Monoid)
39 deriving newtype (Contravariant, Divisible, Decidable, Semigroup, Monoid)
src/Rel8/Query.hs+8−181
@@ -1,6 +1,7 @@
1−{-# language FlexibleContexts #-}
1+{-# language DerivingStrategies #-}
2+{-# language DerivingVia #-}
3+{-# language GeneralizedNewtypeDeriving #-}
2{-# language StandaloneKindSignatures #-}
4{-# language StandaloneKindSignatures #-}
3−{-# language UndecidableInstances #-}
4
5
5module Rel8.Query
6module Rel8.Query
6 ( Query( Query )
7 ( Query( Query )
@@ -8,201 +9,37 @@ module Rel8.Query
8where
9where
9
10
10-- base
11-- base
11−import Control.Applicative ( liftA2 )
12−import Control.Monad ( liftM2 )
13import Data.Kind ( Type )
12import Data.Kind ( Type )
14−import Data.Monoid ( Any( Any ) )
15import Prelude
13import Prelude
16
14
17-- opaleye
15-- opaleye
18−import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
16+import qualified Opaleye.Select as Opaleye
19−import qualified Opaleye.Internal.PackMap as Opaleye
20−import qualified Opaleye.Internal.PrimQuery as Opaleye hiding (lateral)
21−import qualified Opaleye.Internal.QueryArr as Opaleye
22−import qualified Opaleye.Internal.Tag as Opaleye
23
17
24-- rel8
18-- rel8
25−import Rel8.Expr ( Expr )
26import Rel8.Query.Set ( unionAll )
19import Rel8.Query.Set ( unionAll )
27−import Rel8.Query.Opaleye ( fromOpaleye )
28import Rel8.Query.Values ( values )
20import Rel8.Query.Values ( values )
29−import Rel8.Table ( Table, fromColumns, toColumns )
30import Rel8.Table.Alternative
21import Rel8.Table.Alternative
31 ( AltTable, (<|>:)
22 ( AltTable, (<|>:)
32 , AlternativeTable, emptyTable
23 , AlternativeTable, emptyTable
33 )
24 )
34−import Rel8.Table.Projection ( Projectable, apply, project )
35
25
36-- semigroupoids
26-- semigroupoids
37−import Data.Functor.Apply ( Apply, (<.>) )
27+import Data.Functor.Apply ( Apply, WrappedApplicative(..) )
38import Data.Functor.Bind ( Bind, (>>-) )
28import Data.Functor.Bind ( Bind, (>>-) )
39
29
40
30
41-- | The @Query@ monad allows you to compose a @SELECT@ query. This monad has
31-- | The @Query@ monad allows you to compose a @SELECT@ query. This monad has
42-- semantics similar to the list (@[]@) monad.
32-- semantics similar to the list (@[]@) monad.
43type Query :: Type -> Type
33type Query :: Type -> Type
44−newtype Query a =
34+newtype Query a = Query (Opaleye.Select a)
45− Query (
35+ deriving newtype (Functor, Applicative, Monad)
46− -- This is based on Opaleye's Select monad, but with two addtions. We
36+ deriving Apply via (WrappedApplicative Opaleye.Select)
47− -- maintain a stack of PrimExprs from parent previous subselects. In
48− -- practice, these are always the results of dummy calls to random().
49− --
50− -- We also return a Bool that indicates to the parent subselect whether
51− -- or not that stack of PrimExprs were used at any point. If they weren't,
52− -- then the call to random() is never added to the query.
53− --
54− -- This is all needed to implement evaluate. Consider the following code:
55− --
56− -- do
57− -- x <- values [lit 'a', lit 'b', lit 'c']
58− -- y <- evaluate $ nextval "user_id_seq"
59− -- pure (x, y)
60− --
61− -- If we just used Opaleye's Select monad directly, the SQL would come out
62− -- like this:
63− --
64− -- SELECT
65− -- a, b
66− -- FROM
67− -- (VALUES ('a'), ('b'), ('c')) Q1(a),
68− -- LATERAL (SELECT nextval('user_id_seq')) Q2(b);
69− --
70− -- From the Haskell code, you would intuitively expect to get back the
71− -- results of three different calls to nextval(), but from Postgres' point
72− -- of view, because the Q2 subquery doesn't reference anything from the Q1
73− -- query, it thinks it only needs to call nextval() once. This is actually
74− -- exactly the same problem you get with the deprecated ListT IO monad from
75− -- the transformers package — *> behaves differently to >>=, so
76− -- using ApplicativeDo can change the results of a program. ApplicativeDo
77− -- is exactly the optimisation Postgres does on a "LATERAL" query that
78− -- doesn't make any references to previous subselects.
79− --
80− -- Rel8's solution is generate the following SQL instead:
81− --
82− -- SELECT
83− -- a, b
84− -- FROM
85− -- (SELECT
86− -- random() AS dummy,
87− -- *
88− -- FROM
89− -- (VALUES ('a'), ('b'), ('c')) Q1(a)) Q1,
90− -- LATERAL (SELECT
91− -- CASE
92− -- WHEN dummy IS NOT NULL
93− -- THEN nextval('user_id_seq')
94− -- END) Q2(b);
95− --
96− -- We use random() here as the dummy value (and not some constant) because
97− -- Postgres will again optimize if it sees that a value is constant
98− -- (and thus only call nextval() once), but because random() is marked as
99− -- VOLATILE, this inhibits Postgres from doing that optimisation.
100− --
101− -- Why not just reference the a column from the previous query directly
102− -- instead of adding a dummy value? Basically, even if we extract out all
103− -- the bindings introduced in a PrimQuery, we can't always be sure which
104− -- ones refer to constant values, so if we end up laterally referencing a
105− -- constant value, then all of this would be for nothing.
106− --
107− -- Why not just add the call to the previous subselect directly, like so:
108− --
109− -- SELECT
110− -- a, b
111− -- FROM
112− -- (SELECT
113− -- nextval('user_id_seq') AS eval,
114− -- *
115− -- FROM
116− -- (VALUES ('a'), ('b'), ('c')) Q1(a)) Q1,
117− -- LATERAL (SELECT eval) Q2(b);
118− --
119− -- That would work in this case. But consider the following Rel8 code:
120− --
121− -- do
122− -- x <- values [lit 'a', lit 'b', lit 'c']
123− -- y <- values [lit 'd', lit 'e', lit 'f']
124− -- z <- evaluate $ nextval "user_id_seq"
125− -- pure (x, y, z)
126− --
127− -- How many calls to nextval should there be? Our Haskell intuition says
128− -- nine. But that's not what you would get if you used the above
129− -- technique. The problem is, which VALUES query should the nextval be
130− -- added to? You can choose one or the other to get three calls to
131− -- nextval, but you still need to make a superfluous LATERAL references to
132− -- the other if you want nine calls. So for the above Rel8 code we generate
133− -- the following SQL:
134− --
135− -- SELECT
136− -- a, b, c
137− -- FROM
138− -- (SELECT
139− -- random() AS dummy,
140− -- *
141− -- FROM
142− -- (VALUES ('a'), ('b'), ('c')) Q1(a)) Q1,
143− -- (SELECT
144− -- random() AS dummy,
145− -- *
146− -- FROM
147− -- (VALUES ('d'), ('e'), ('f')) Q2(b)) Q2,
148− -- LATERAL (SELECT
149− -- CASE
150− -- WHEN Q1.dummy IS NOT NULL AND Q2.dummy IS NOT NULL
151− -- THEN nextval('user_id_seq')
152− -- END) Q3(c);
153− --
154− -- This gives nine calls to nextval() as we would expect.
155− [Opaleye.PrimExpr] -> Opaleye.Select (Any, a)
156− )
157−
158−
159−instance Projectable Query where
160− project f = fmap (fromColumns . apply f . toColumns)
161−
162−
163−instance Functor Query where
164− fmap f (Query a) = Query (fmap (fmap (fmap f)) a)
165−
166−
167−instance Apply Query where
168− (<.>) = (<*>)
169−
170−
171−instance Applicative Query where
172− pure = fromOpaleye . pure
173− liftA2 = liftM2
174
37
175
38
176instance Bind Query where
39instance Bind Query where
177 (>>-) = (>>=)
40 (>>-) = (>>=)
178
41
179
42
180−instance Monad Query where
181− Query q >>= f = Query $ \dummies -> Opaleye.stateQueryArr $ \_ tag ->
182− let
183− qa = q dummies
184− ((m, a), query, tag') = Opaleye.runStateQueryArr qa () tag
185− Query q' = f a
186− (dummies', query', tag'') =
187− ( dummy : dummies
188− , query <> Opaleye.aRebind bindings
189− , Opaleye.next tag'
190− )
191− where
192− (dummy, bindings) = Opaleye.run $ name random
193− where
194− random = Opaleye.FunExpr "random" []
195− name = Opaleye.extractAttr "dummy" tag'
196− qa' = Opaleye.lateral $ \_ -> q' dummies'
197− ((m'@(Any needsDummies), b), query'', tag''') = Opaleye.runStateQueryArr qa' () tag''
198− query'''
199− | needsDummies = query' <> query''
200− | otherwise = query <> query''
201− m'' = m <> m'
202− in
203− ((m'', b), query''', tag''')
204−
205−
206-- | '<|>:' = 'unionAll'.
43-- | '<|>:' = 'unionAll'.
207instance AltTable Query where
44instance AltTable Query where
208 (<|>:) = unionAll
45 (<|>:) = unionAll
@@ -211,13 +48,3 @@ instance AltTable Query where
211-- | 'emptyTable' = 'values' @[]@.
48-- | 'emptyTable' = 'values' @[]@.
212instance AlternativeTable Query where
49instance AlternativeTable Query where
213 emptyTable = values []
50 emptyTable = values []
214−
215−
216−-- | '<>' = 'unionAll'.
217−instance Table Expr a => Semigroup (Query a) where
218− (<>) = (<|>:)
219−
220−
221−-- | 'mempty' = @'values' []@.
222−instance Table Expr a => Monoid (Query a) where
223− mempty = emptyTable
src/Rel8/Query.hs-boot+1−3
@@ -7,13 +7,11 @@ where
7
7
8-- base
8-- base
9import Data.Kind ( Type )
9import Data.Kind ( Type )
10−import Data.Monoid ( Any )
11import Prelude ()
10import Prelude ()
12
11
13-- opaleye
12-- opaleye
14−import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
15import qualified Opaleye.Select as Opaleye
13import qualified Opaleye.Select as Opaleye
16
14
17
15
18type Query :: Type -> Type
16type Query :: Type -> Type
19−newtype Query a = Query ([Opaleye.PrimExpr] -> Opaleye.Select (Any, a))
17+newtype Query a = Query (Opaleye.Select a)
src/Rel8/Query/Aggregate.hs+2−25
@@ -1,17 +1,12 @@
1{-# language FlexibleContexts #-}
1{-# language FlexibleContexts #-}
2−{-# language MonoLocalBinds #-}
3−{-# language ScopedTypeVariables #-}
4−{-# language TypeApplications #-}
5
2
6module Rel8.Query.Aggregate
3module Rel8.Query.Aggregate
7 ( aggregate
4 ( aggregate
8 , countRows
5 , countRows
9− , mode
10 )
6 )
11where
7where
12
8
13-- base
9-- base
14−import Data.Functor.Contravariant ( (>$<) )
15import Data.Int ( Int64 )
10import Data.Int ( Int64 )
16import Prelude
11import Prelude
17
12
@@ -19,38 +14,20 @@ import Prelude
19import qualified Opaleye.Aggregate as Opaleye
14import qualified Opaleye.Aggregate as Opaleye
20
15
21-- rel8
16-- rel8
22−import Rel8.Aggregate ( Aggregates )
17+import Rel8.Aggregate ( Aggregate )
23import Rel8.Expr ( Expr )
18import Rel8.Expr ( Expr )
24import Rel8.Expr.Aggregate ( countStar )
19import Rel8.Expr.Aggregate ( countStar )
25−import Rel8.Expr.Order ( desc )
26import Rel8.Query ( Query )
20import Rel8.Query ( Query )
27−import Rel8.Query.Limit ( limit )
28import Rel8.Query.Maybe ( optional )
21import Rel8.Query.Maybe ( optional )
29import Rel8.Query.Opaleye ( mapOpaleye )
22import Rel8.Query.Opaleye ( mapOpaleye )
30−import Rel8.Query.Order ( orderBy )
31−import Rel8.Table ( toColumns )
32−import Rel8.Table.Aggregate ( hgroupBy )
33−import Rel8.Table.Cols ( Cols( Cols ), fromCols )
34−import Rel8.Table.Eq ( EqTable, eqTable )
35import Rel8.Table.Opaleye ( aggregator )
23import Rel8.Table.Opaleye ( aggregator )
36import Rel8.Table.Maybe ( maybeTable )
24import Rel8.Table.Maybe ( maybeTable )
37
25
38
26
39-- | Apply an aggregation to all rows returned by a 'Query'.
27-- | Apply an aggregation to all rows returned by a 'Query'.
40−aggregate :: Aggregates aggregates exprs => Query aggregates -> Query exprs
28+aggregate :: Query (Aggregate exprs) -> Query exprs
41aggregate = mapOpaleye (Opaleye.aggregate aggregator)
29aggregate = mapOpaleye (Opaleye.aggregate aggregator)
42
30
43
31
44−-- | Count the number of rows returned by a query. Note that this is different
45−-- from @countStar@, as even if the given query yields no rows, @countRows@
46−-- will return @0@.
47countRows :: Query a -> Query (Expr Int64)
32countRows :: Query a -> Query (Expr Int64)
48countRows = fmap (maybeTable 0 id) . optional . aggregate . fmap (const countStar)
33countRows = fmap (maybeTable 0 id) . optional . aggregate . fmap (const countStar)
49−
50−
51−-- | Return the most common row in a query.
52−mode :: forall a. EqTable a => Query a -> Query a
53−mode rows = limit 1 $ fmap (fromCols . snd) $ orderBy (fst >$< desc) $ do
54− aggregate $ do
55− row <- toColumns <$> rows
56− pure (countStar, Cols $ hgroupBy (eqTable @a) row)
src/Rel8/Query/Distinct.hs+12−4
@@ -1,3 +1,5 @@
1+{-# options_ghc -fno-warn-redundant-constraints #-}
2+
1module Rel8.Query.Distinct
3module Rel8.Query.Distinct
2 ( distinct
4 ( distinct
3 , distinctOn
5 , distinctOn
@@ -6,11 +8,12 @@ module Rel8.Query.Distinct
6where
8where
7
9
8-- base
10-- base
9−import Prelude ()
11+import Prelude
10
12
11-- opaleye
13-- opaleye
12import qualified Opaleye.Distinct as Opaleye
14import qualified Opaleye.Distinct as Opaleye
13−import qualified Opaleye.Order as Opaleye
15+import qualified Opaleye.Internal.Order as Opaleye
16+import qualified Opaleye.Internal.QueryArr as Opaleye
14
17
15-- rel8
18-- rel8
16import Rel8.Order ( Order( Order ) )
19import Rel8.Order ( Order( Order ) )
@@ -22,6 +25,9 @@ import Rel8.Table.Opaleye ( distinctspec, unpackspec )
22
25
23-- | Select all distinct rows from a query, removing duplicates. @distinct q@
26-- | Select all distinct rows from a query, removing duplicates. @distinct q@
24-- is equivalent to the SQL statement @SELECT DISTINCT q@.
27-- is equivalent to the SQL statement @SELECT DISTINCT q@.
28+--
29+-- >>> select c $ distinct $ values [ lit True, lit True, lit False ]
30+-- [False,True]
25distinct :: EqTable a => Query a -> Query a
31distinct :: EqTable a => Query a -> Query a
26distinct = mapOpaleye (Opaleye.distinctExplicit distinctspec)
32distinct = mapOpaleye (Opaleye.distinctExplicit distinctspec)
27
33
@@ -30,11 +36,13 @@ distinct = mapOpaleye (Opaleye.distinctExplicit distinctspec)
30-- to a projection. If multiple rows have the same projection, it is
36-- to a projection. If multiple rows have the same projection, it is
31-- unspecified which row will be returned. If this matters, use 'distinctOnBy'.
37-- unspecified which row will be returned. If this matters, use 'distinctOnBy'.
32distinctOn :: EqTable b => (a -> b) -> Query a -> Query a
38distinctOn :: EqTable b => (a -> b) -> Query a -> Query a
39+distinctOn proj =
33−distinctOn proj = mapOpaleye (Opaleye.distinctOnExplicit unpackspec proj)
40+ mapOpaleye (\q -> Opaleye.productQueryArr (Opaleye.distinctOn unpackspec proj . Opaleye.runSimpleQueryArr q))
34
41
35
42
36-- | Select all distinct rows from a query, where rows are equivalent according
43-- | Select all distinct rows from a query, where rows are equivalent according
37-- to a projection. If there are multiple rows with the same projection, the
44-- to a projection. If there are multiple rows with the same projection, the
38-- first row according to the specified 'Order' will be returned.
45-- first row according to the specified 'Order' will be returned.
39distinctOnBy :: EqTable b => (a -> b) -> Order a -> Query a -> Query a
46distinctOnBy :: EqTable b => (a -> b) -> Order a -> Query a -> Query a
40−distinctOnBy proj (Order order) = mapOpaleye (Opaleye.distinctOnByExplicit unpackspec proj order)
47+distinctOnBy proj (Order order) =
48+ mapOpaleye (\q -> Opaleye.productQueryArr (Opaleye.distinctOnBy unpackspec proj order . Opaleye.runSimpleQueryArr q))
src/Rel8/Query/Each.hs+8−4
@@ -1,5 +1,4 @@
1{-# language FlexibleContexts #-}
1{-# language FlexibleContexts #-}
2−{-# language MonoLocalBinds #-}
3
2
4module Rel8.Query.Each
3module Rel8.Query.Each
5 ( each
4 ( each
@@ -17,16 +16,21 @@ import Rel8.Query ( Query )
17import Rel8.Query.Opaleye ( fromOpaleye )
16import Rel8.Query.Opaleye ( fromOpaleye )
18import Rel8.Schema.Name ( Selects )
17import Rel8.Schema.Name ( Selects )
19import Rel8.Schema.Table ( TableSchema )
18import Rel8.Schema.Table ( TableSchema )
20−import Rel8.Table.Cols ( fromCols, toCols )
19+import Rel8.Table ( fromColumns, toColumns )
21import Rel8.Table.Opaleye ( table, unpackspec )
20import Rel8.Table.Opaleye ( table, unpackspec )
22
21
23
22
24-- | Select each row from a table definition. This is equivalent to @FROM
23-- | Select each row from a table definition. This is equivalent to @FROM
25-- table@.
24-- table@.
25+--
26+-- >>> mapM_ print =<< select c (each projectSchema)
27+-- Project {projectAuthorId = 1, projectName = "rel8"}
28+-- Project {projectAuthorId = 2, projectName = "aeson"}
29+-- Project {projectAuthorId = 2, projectName = "text"}
26each :: Selects names exprs => TableSchema names -> Query exprs
30each :: Selects names exprs => TableSchema names -> Query exprs
27each =
31each =
28− fmap fromCols .
32+ fmap fromColumns .
29 fromOpaleye .
33 fromOpaleye .
30 Opaleye.selectTableExplicit unpackspec .
34 Opaleye.selectTableExplicit unpackspec .
31 table .
35 table .
32− fmap toCols
36+ fmap toColumns
src/Rel8/Query/Either.hs+17−27
@@ -3,22 +3,23 @@
3module Rel8.Query.Either
3module Rel8.Query.Either
4 ( keepLeftTable
4 ( keepLeftTable
5 , keepRightTable
5 , keepRightTable
6+ , bindEitherTable
6 , bitraverseEitherTable
7 , bitraverseEitherTable
7 )
8 )
8where
9where
9
10
10-- base
11-- base
12+import Data.Functor ( (<&>) )
11import Prelude
13import Prelude
12
14
13−-- comonad
14−import Control.Comonad ( extract )
15−
16-- rel8
15-- rel8
17import Rel8.Expr ( Expr )
16import Rel8.Expr ( Expr )
18import Rel8.Expr.Eq ( (==.) )
17import Rel8.Expr.Eq ( (==.) )
19import Rel8.Query ( Query )
18import Rel8.Query ( Query )
20import Rel8.Query.Filter ( where_ )
19import Rel8.Query.Filter ( where_ )
21import Rel8.Query.Maybe ( optional )
20import Rel8.Query.Maybe ( optional )
21+import Rel8.Table ( Table )
22+import Rel8.Table.Bool ( bool )
22import Rel8.Table.Either
23import Rel8.Table.Either
23 ( EitherTable( EitherTable )
24 ( EitherTable( EitherTable )
24 , isLeftTable, isRightTable
25 , isLeftTable, isRightTable
@@ -26,41 +27,30 @@ import Rel8.Table.Either
26import Rel8.Table.Maybe ( MaybeTable( MaybeTable ), isJustTable )
27import Rel8.Table.Maybe ( MaybeTable( MaybeTable ), isJustTable )
27
28
28
29
29−-- | Filter 'EitherTable's, keeping only 'leftTable's.
30−keepLeftTable :: EitherTable Expr a b -> Query a
30+keepLeftTable :: EitherTable a b -> Query a
31keepLeftTable e@(EitherTable _ a _) = do
31keepLeftTable e@(EitherTable _ a _) = do
32 where_ $ isLeftTable e
32 where_ $ isLeftTable e
33− pure (extract a)
33+ pure a
34
34
35
35
36−-- | Filter 'EitherTable's, keeping only 'rightTable's.
37−keepRightTable :: EitherTable Expr a b -> Query b
36+keepRightTable :: EitherTable a b -> Query b
38keepRightTable e@(EitherTable _ _ b) = do
37keepRightTable e@(EitherTable _ _ b) = do
39 where_ $ isRightTable e
38 where_ $ isRightTable e
40− pure (extract b)
39+ pure b
40+
41+
42+bindEitherTable :: (Table Expr a, Functor m)
43+ => (i -> m (EitherTable a b)) -> EitherTable a i -> m (EitherTable a b)
44+bindEitherTable query e@(EitherTable input a i) = do
45+ query i <&> \(EitherTable output a' b) ->
46+ EitherTable (input <> output) (bool a a' (isRightTable e)) b
41
47
42
48
43−-- | @bitraverseEitherTable f g x@ will pass all @leftTable@s through @f@ and
44−-- all @rightTable@s through @g@. The results are then lifted back into
45−-- @leftTable@ and @rightTable@, respectively. This is similar to 'bitraverse'
46−-- for 'Either'.
47−--
48−-- For example,
49−--
50−-- >>> :{
51−-- select do
52−-- x <- values (map lit [ Left True, Right (42 :: Int32) ])
53−-- bitraverseEitherTable (\y -> values [y, not_ y]) (\y -> pure (y * 100)) x
54−-- :}
55−-- [ Left True
56−-- , Left False
57−-- , Right 4200
58−-- ]
59bitraverseEitherTable :: ()
49bitraverseEitherTable :: ()
60 => (a -> Query c)
50 => (a -> Query c)
61 -> (b -> Query d)
51 -> (b -> Query d)
62− -> EitherTable Expr a b
52+ -> EitherTable a b
63− -> Query (EitherTable Expr c d)
53+ -> Query (EitherTable c d)
64bitraverseEitherTable f g e@(EitherTable tag _ _) = do
54bitraverseEitherTable f g e@(EitherTable tag _ _) = do
65 mc@(MaybeTable _ c) <- optional (f =<< keepLeftTable e)
55 mc@(MaybeTable _ c) <- optional (f =<< keepLeftTable e)
66 md@(MaybeTable _ d) <- optional (g =<< keepRightTable e)
56 md@(MaybeTable _ d) <- optional (g =<< keepRightTable e)
src/Rel8/Query/Evaluate.hsdeleted−49
@@ -1,49 +0,0 @@
1−{-# language FlexibleContexts #-}
2−{-# language TupleSections #-}
3−
4−module Rel8.Query.Evaluate
5− ( evaluate
6− )
7−where
8−
9−-- base
10−import Control.Monad ( (>=>) )
11−import Data.Foldable ( foldl' )
12−import Data.List.NonEmpty ( NonEmpty( (:|) ), nonEmpty )
13−import Data.Monoid ( Any( Any ) )
14−import Prelude hiding ( undefined )
15−
16−-- opaleye
17−import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
18−
19−-- rel8
20−import Rel8.Expr ( Expr )
21−import Rel8.Expr.Bool ( (&&.) )
22−import Rel8.Expr.Opaleye ( fromPrimExpr )
23−import Rel8.Query ( Query( Query ) )
24−import Rel8.Query.Rebind ( rebind )
25−import Rel8.Table ( Table )
26−import Rel8.Table.Bool ( case_ )
27−import Rel8.Table.Undefined ( undefined )
28−
29−
30−-- | 'evaluate' takes expressions that could potentially have side effects and
31−-- \"runs\" them in the 'Query' monad. The returned expressions have no side
32−-- effects and can safely be reused.
33−evaluate :: Table Expr a => a -> Query a
34−evaluate = laterally >=> rebind "eval"
35−
36−
37−laterally :: Table Expr a => a -> Query a
38−laterally a = Query $ \bindings -> pure $ (Any True,) $
39− case nonEmpty bindings of
40− Nothing -> a
41− Just bindings' -> case_ [(condition, a)] undefined
42− where
43− condition = foldl1' (&&.) (fmap go bindings')
44− where
45− go = fromPrimExpr . Opaleye.UnExpr Opaleye.OpIsNotNull
46−
47−
48−foldl1' :: (a -> a -> a) -> NonEmpty a -> a
49−foldl1' f (a :| as) = foldl' f a as
src/Rel8/Query/Exists.hs+49−21
@@ -2,8 +2,8 @@
2
2
3module Rel8.Query.Exists
3module Rel8.Query.Exists
4 ( exists, inQuery
4 ( exists, inQuery
5− , present, with, withBy
5+ , whereExists, with, withBy
6− , absent, without, withoutBy
6+ , whereNotExists, without, withoutBy
7 )
7 )
8where
8where
9
9
@@ -11,56 +11,84 @@ where
11import Prelude hiding ( filter )
11import Prelude hiding ( filter )
12
12
13-- opaleye
13-- opaleye
14−import qualified Opaleye.Exists as Opaleye
15import qualified Opaleye.Operators as Opaleye
14import qualified Opaleye.Operators as Opaleye
16
15
17-- rel8
16-- rel8
18import Rel8.Expr ( Expr )
17import Rel8.Expr ( Expr )
19−import Rel8.Expr.Opaleye ( fromColumn, fromPrimExpr )
20import Rel8.Query ( Query )
18import Rel8.Query ( Query )
21import Rel8.Query.Filter ( filter )
19import Rel8.Query.Filter ( filter )
20+import Rel8.Query.Maybe ( optional )
22import Rel8.Query.Opaleye ( mapOpaleye )
21import Rel8.Query.Opaleye ( mapOpaleye )
23import Rel8.Table.Eq ( EqTable, (==:) )
22import Rel8.Table.Eq ( EqTable, (==:) )
23+import Rel8.Table.Maybe ( isJustTable )
24
24
25
25
26-- | Checks if a query returns at least one row.
26-- | Checks if a query returns at least one row.
27+--
28+-- >>> :{
29+-- mapM_ print =<< select c do
30+-- author <- each authorSchema
31+-- hasProjects <- exists do
32+-- project <- each projectSchema
33+-- where_ $ authorId author ==. projectAuthorId project
34+-- return (authorName author, hasProjects)
35+-- :}
36+-- ("Ollie",True)
37+-- ("Bryan O'Sullivan",True)
38+-- ("Emily Pillmore",False)
27exists :: Query a -> Query (Expr Bool)
39exists :: Query a -> Query (Expr Bool)
28−exists = fmap (fromPrimExpr . fromColumn) . mapOpaleye Opaleye.exists
40+exists = fmap isJustTable . optional . whereExists
41+-- FIXME: change this when b7aacc07c6392654cae439fc3b997620c3aa7a87 makes it
42+-- into a release of Opaleye
29
43
30
44
31inQuery :: EqTable a => a -> Query a -> Query (Expr Bool)
45inQuery :: EqTable a => a -> Query a -> Query (Expr Bool)
32inQuery a = exists . (>>= filter (a ==:))
46inQuery a = exists . (>>= filter (a ==:))
33
47
34
48
35−-- | Produce the empty query if the given query returns no rows. @present@
49+-- | Produce the empty query if the given query returns no rows. @whereExists@
36-- is equivalent to @WHERE EXISTS@ in SQL.
50-- is equivalent to @WHERE EXISTS@ in SQL.
51+--
52+-- >>> :{
53+-- select c do
54+-- author <- each authorSchema
55+-- whereExists do
56+-- project <- each projectSchema
57+-- where_ $ projectAuthorId project ==. authorId author
58+-- return $ authorName author
59+-- :}
60+-- ["Ollie","Bryan O'Sullivan"]
37−present :: Query a -> Query ()
61+whereExists :: Query a -> Query ()
38−present = mapOpaleye Opaleye.restrictExists
62+whereExists = mapOpaleye Opaleye.restrictExists
39−
63+
40−
64+
41−-- | Produce the empty query if the given query returns rows. @absent@
65+-- | Produce the empty query if the given query returns rows. @whereNotExists@
42-- is equivalent to @WHERE NOT EXISTS@ in SQL.
66-- is equivalent to @WHERE NOT EXISTS@ in SQL.
67+--
68+-- >>> :{
69+-- select c do
70+-- author <- each authorSchema
71+-- whereNotExists do
72+-- project <- each projectSchema
73+-- where_ $ projectAuthorId project ==. authorId author
74+-- return $ authorName author
75+-- :}
76+-- ["Emily Pillmore"]
43−absent :: Query a -> Query ()
77+whereNotExists :: Query a -> Query ()
44−absent = mapOpaleye Opaleye.restrictNotExists
78+whereNotExists = mapOpaleye Opaleye.restrictNotExists
45
79
46
80
47−-- | @with@ is similar to 'filter', but allows the predicate to be a full query.
48−--
49−-- @with f a = a <$ present (f a)@, but this form matches 'filter'.
50with :: (a -> Query b) -> a -> Query a
81with :: (a -> Query b) -> a -> Query a
51−with f a = a <$ present (f a)
82+with f a = a <$ whereExists (f a)
52
83
53
84
54−-- | Like @with@, but with a custom membership test.
55withBy :: (a -> b -> Expr Bool) -> Query b -> a -> Query a
85withBy :: (a -> b -> Expr Bool) -> Query b -> a -> Query a
56withBy predicate bs = with $ \a -> bs >>= filter (predicate a)
86withBy predicate bs = with $ \a -> bs >>= filter (predicate a)
57
87
58
88
59−-- | Filter rows where @a -> Query b@ yields no rows.
60without :: (a -> Query b) -> a -> Query a
89without :: (a -> Query b) -> a -> Query a
61−without f a = a <$ absent (f a)
90+without f a = a <$ whereNotExists (f a)
62
91
63
92
64−-- | Like @without@, but with a custom membership test.
65withoutBy :: (a -> b -> Expr Bool) -> Query b -> a -> Query a
93withoutBy :: (a -> b -> Expr Bool) -> Query b -> a -> Query a
66withoutBy predicate bs = without $ \a -> bs >>= filter (predicate a)
94withoutBy predicate bs = without $ \a -> bs >>= filter (predicate a)
src/Rel8/Query/Filter.hs+11
@@ -24,12 +24,23 @@ import Rel8.Query.Opaleye ( fromOpaleye )
24-- return @x@ unchanged when @f x@ is @True@. This is similar to
24-- return @x@ unchanged when @f x@ is @True@. This is similar to
25-- 'Control.Monad.guard', but as the predicate is separate from the argument,
25-- 'Control.Monad.guard', but as the predicate is separate from the argument,
26-- it is easy to use in a pipeline of 'Query' transformations.
26-- it is easy to use in a pipeline of 'Query' transformations.
27+--
28+-- >>> select c $ values [ lit x | x <- [ 1..5 :: Int32 ] ] >>= filter (>. 3)
29+-- [4,5]
27filter :: (a -> Expr Bool) -> a -> Query a
30filter :: (a -> Expr Bool) -> a -> Query a
28filter f a = a <$ where_ (f a)
31filter f a = a <$ where_ (f a)
29
32
30
33
31-- | Drop any rows that don't match a predicate. @where_ expr@ is equivalent
34-- | Drop any rows that don't match a predicate. @where_ expr@ is equivalent
32-- to the SQL @WHERE expr@.
35-- to the SQL @WHERE expr@.
36+--
37+-- >>> :{
38+-- select c $ do
39+-- x <- values [ lit x | x <- [ 1..5 :: Int32 ] ]
40+-- where_ $ x >. lit 2
41+-- return x
42+-- :}
43+-- [3,4,5]
33where_ :: Expr Bool -> Query ()
44where_ :: Expr Bool -> Query ()
34where_ condition =
45where_ condition =
35 fromOpaleye $ lmap (\_ -> toColumn $ toPrimExpr condition) Opaleye.restrict
46 fromOpaleye $ lmap (\_ -> toColumn $ toPrimExpr condition) Opaleye.restrict
src/Rel8/Query/Indexed.hsdeleted−21
@@ -1,21 +0,0 @@
1−module Rel8.Query.Indexed
2− ( indexed
3− )
4−where
5−
6−-- base
7−import Control.Applicative ( liftA2 )
8−import Data.Int ( Int64 )
9−import Prelude
10−
11−-- rel8
12−import Rel8.Expr ( Expr )
13−import Rel8.Expr.Window ( rowNumber )
14−import Rel8.Query ( Query )
15−import Rel8.Query.Window ( window )
16−import Rel8.Table.Window ( currentRow )
17−
18−
19−-- | Pair each row of a query with its index within the query.
20−indexed :: Query a -> Query (Expr Int64, a)
21−indexed = window (liftA2 (,) (subtract 1 <$> rowNumber) currentRow)
src/Rel8/Query/Limit.hs+6
@@ -17,11 +17,17 @@ import Rel8.Query.Opaleye ( mapOpaleye )
17
17
18-- | @limit n@ select at most @n@ rows from a query. @limit n@ is equivalent
18-- | @limit n@ select at most @n@ rows from a query. @limit n@ is equivalent
19-- to the SQL @LIMIT n@.
19-- to the SQL @LIMIT n@.
20+--
21+-- >>> select c $ limit 3 $ values [ lit x | x <- [ 1..5 :: Int32 ] ]
22+-- [1,2,3]
20limit :: Word -> Query a -> Query a
23limit :: Word -> Query a -> Query a
21limit = mapOpaleye . Opaleye.limit . fromIntegral
24limit = mapOpaleye . Opaleye.limit . fromIntegral
22
25
23
26
24-- | @offset n@ drops the first @n@ rows from a query. @offset n@ is equivalent
27-- | @offset n@ drops the first @n@ rows from a query. @offset n@ is equivalent
25-- to the SQL @OFFSET n@.
28-- to the SQL @OFFSET n@.
29+--
30+-- >>> select c $ offset 3 $ values [ lit x | x <- [ 1..5 :: Int32 ] ]
31+-- [4,5]
26offset :: Word -> Query a -> Query a
32offset :: Word -> Query a -> Query a
27offset = mapOpaleye . Opaleye.offset . fromIntegral
33offset = mapOpaleye . Opaleye.offset . fromIntegral
src/Rel8/Query/List.hs+14−93
@@ -1,58 +1,23 @@
1{-# language FlexibleContexts #-}
1{-# language FlexibleContexts #-}
2−{-# language GADTs #-}
3−{-# language NamedFieldPuns #-}
4
2
5module Rel8.Query.List
3module Rel8.Query.List
6 ( many, some
4 ( many, some
7− , manyExpr, someExpr
8− , catListTable, catNonEmptyTable
9− , catList, catNonEmpty
10 )
5 )
11where
6where
12
7
13-- base
8-- base
14−import Data.Functor.Identity ( runIdentity )
15−import Data.List.NonEmpty ( NonEmpty )
16import Prelude
9import Prelude
17
10
18−-- opaleye
19−import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
20−
21-- rel8
11-- rel8
22import Rel8.Expr ( Expr )
12import Rel8.Expr ( Expr )
23−import Rel8.Expr.Aggregate ( listAggExpr, nonEmptyAggExpr )
24−import Rel8.Expr.Opaleye ( mapPrimExpr )
25import Rel8.Query ( Query )
13import Rel8.Query ( Query )
26import Rel8.Query.Aggregate ( aggregate )
14import Rel8.Query.Aggregate ( aggregate )
27import Rel8.Query.Maybe ( optional )
15import Rel8.Query.Maybe ( optional )
28−import Rel8.Query.Rebind ( rebind )
16+import Rel8.Table ( Table )
29−import Rel8.Schema.HTable.Vectorize ( hunvectorize )
30−import Rel8.Schema.Null ( Sql, Unnullify )
31−import Rel8.Schema.Spec ( Spec( Spec, info ) )
32−import Rel8.Table ( Table, fromColumns )
33−import Rel8.Table.Cols ( toCols )
34import Rel8.Table.Aggregate ( listAgg, nonEmptyAgg )
17import Rel8.Table.Aggregate ( listAgg, nonEmptyAgg )
35−import Rel8.Table.List ( ListTable( ListTable ) )
18+import Rel8.Table.List ( ListTable )
36import Rel8.Table.Maybe ( maybeTable )
19import Rel8.Table.Maybe ( maybeTable )
37−import Rel8.Table.NonEmpty ( NonEmptyTable( NonEmptyTable ) )
20+import Rel8.Table.NonEmpty ( NonEmptyTable )
38−import Rel8.Type ( DBType, typeInformation )
39−import Rel8.Type.Array ( extractArrayElement )
40−import Rel8.Type.Information ( TypeInformation )
41−
42−
43−-- | Aggregate a 'Query' into a 'ListTable'. If the supplied query returns 0
44−-- rows, this function will produce a 'Query' that returns one row containing
45−-- the empty @ListTable@. If the supplied @Query@ does return rows, @many@ will
46−-- return exactly one row, with a @ListTable@ collecting all returned rows.
47−--
48−-- @many@ is analogous to 'Control.Applicative.many' from
49−-- @Control.Applicative@.
50−many :: Table Expr a => Query a -> Query (ListTable Expr a)
51−many =
52− fmap (maybeTable mempty (\(ListTable a) -> ListTable a)) .
53− optional .
54− aggregate .
55− fmap (listAgg . toCols)
56
21
57
22
58-- | Aggregate a 'Query' into a 'NonEmptyTable'. If the supplied query returns
23-- | Aggregate a 'Query' into a 'NonEmptyTable'. If the supplied query returns
@@ -63,60 +28,16 @@ many =
63--
28--
64-- @some@ is analogous to 'Control.Applicative.some' from
29-- @some@ is analogous to 'Control.Applicative.some' from
65-- @Control.Applicative@.
30-- @Control.Applicative@.
66−some :: Table Expr a => Query a -> Query (NonEmptyTable Expr a)
31+some :: Table Expr a => Query a -> Query (NonEmptyTable a)
67−some =
68− fmap (\(NonEmptyTable a) -> NonEmptyTable a) .
69− aggregate .
70− fmap (nonEmptyAgg . toCols)
32+some = aggregate . fmap nonEmptyAgg
71−
72−
73−-- | A version of 'many' specialised to single expressions.
74−manyExpr :: Sql DBType a => Query (Expr a) -> Query (Expr [a])
75−manyExpr = fmap (maybeTable mempty id) . optional . aggregate . fmap listAggExpr
76−
77−
78−-- | A version of 'many' specialised to single expressions.
79−someExpr :: Sql DBType a => Query (Expr a) -> Query (Expr (NonEmpty a))
80−someExpr = aggregate . fmap nonEmptyAggExpr
81−
82−
83−-- | Expand a 'ListTable' into a 'Query', where each row in the query is an
84−-- element of the given @ListTable@.
85−--
86−-- @catListTable@ is an inverse to 'many'.
87−catListTable :: Table Expr a => ListTable Expr a -> Query a
88−catListTable (ListTable as) =
89− rebind "unnest" $ fromColumns $ runIdentity $
90− hunvectorize (\Spec {info} -> pure . sunnest info) as
91−
92−
93−-- | Expand a 'NonEmptyTable' into a 'Query', where each row in the query is an
94−-- element of the given @NonEmptyTable@.
95−--
96−-- @catNonEmptyTable@ is an inverse to 'some'.
97−catNonEmptyTable :: Table Expr a => NonEmptyTable Expr a -> Query a
98−catNonEmptyTable (NonEmptyTable as) =
99− rebind "unnest" $ fromColumns $ runIdentity $
100− hunvectorize (\Spec {info} -> pure . sunnest info) as
101−
102−
103−-- | Expand an expression that contains a list into a 'Query', where each row
104−-- in the query is an element of the given list.
105−--
106−-- @catList@ is an inverse to 'manyExpr'.
107−catList :: Sql DBType a => Expr [a] -> Query (Expr a)
108−catList = rebind "unnest" . sunnest typeInformation
109−
110−
111−-- | Expand an expression that contains a non-empty list into a 'Query', where
112−-- each row in the query is an element of the given list.
113−--
114−-- @catNonEmpty@ is an inverse to 'someExpr'.
115−catNonEmpty :: Sql DBType a => Expr (NonEmpty a) -> Query (Expr a)
116−catNonEmpty = rebind "unnest" . sunnest typeInformation
117
33
118
34
119−sunnest :: TypeInformation (Unnullify a) -> Expr (list a) -> Expr a
35+-- | Aggregate a 'Query' into a 'ListTable'. If the supplied query returns 0
120−sunnest info = mapPrimExpr $
36+-- rows, this function will produce a 'Query' that returns one row containing
121− extractArrayElement info .
37+-- the empty @ListTable@. If the supplied @Query@ does return rows, @many@ will
122− Opaleye.UnExpr (Opaleye.UnOpOther "UNNEST")
38+-- return exactly one row, with a @ListTable@ collecting all returned rows.
39+--
40+-- @many@ is analogous to 'Control.Applicative.many' from
41+-- @Control.Applicative@.
42+many :: Table Expr a => Query a -> Query (ListTable a)
43+many = fmap (maybeTable mempty id) . optional . aggregate . fmap listAgg
src/Rel8/Query/Maybe.hs+103−33
@@ -1,10 +1,7 @@
1−{-# language GADTs #-}
2−{-# language LambdaCase #-}
3−{-# language NamedFieldPuns #-}
4−
5module Rel8.Query.Maybe
1module Rel8.Query.Maybe
6 ( optional
2 ( optional
7 , catMaybeTable
3 , catMaybeTable
4+ , bindMaybeTable
8 , traverseMaybeTable
5 , traverseMaybeTable
9 )
6 )
10where
7where
@@ -12,32 +9,37 @@ where
12-- base
9-- base
13import Prelude
10import Prelude
14
11
15−-- comonad
16−import Control.Comonad ( extract )
17−
18-- opaleye
12-- opaleye
19−import qualified Opaleye.Internal.MaybeFields as Opaleye
13+import qualified Opaleye.Internal.PackMap as Opaleye
14+import qualified Opaleye.Internal.PrimQuery as Opaleye
15+import qualified Opaleye.Internal.QueryArr as Opaleye
16+import qualified Opaleye.Internal.Tag as Opaleye
17+import qualified Opaleye.Internal.Unpackspec as Opaleye
20
18
21-- rel8
19-- rel8
22−import Rel8.Expr ( Expr )
20+import Rel8.Expr.Bool ( true )
23import Rel8.Expr.Eq ( (==.) )
21import Rel8.Expr.Eq ( (==.) )
24−import Rel8.Expr.Opaleye ( fromColumn, fromPrimExpr )
22+import Rel8.Expr.Opaleye ( toPrimExpr )
25import Rel8.Query ( Query )
23import Rel8.Query ( Query )
26import Rel8.Query.Filter ( where_ )
24import Rel8.Query.Filter ( where_ )
27import Rel8.Query.Opaleye ( mapOpaleye )
25import Rel8.Query.Opaleye ( mapOpaleye )
28−import Rel8.Table.Maybe ( MaybeTable(..), isJustTable )
26+import Rel8.Table.Maybe ( MaybeTable( MaybeTable ), isJustTable )
27+import Rel8.Table.Opaleye ( unpackspec )
28+import Rel8.Table.Tag ( Tag(..), fromExpr )
29
29
30
30
31−-- | Convert a query that might return zero rows to a query that always returns
32−-- at least one row.
33−--
34−-- To speak in more concrete terms, 'optional' is most useful to write @LEFT
35−-- JOIN@s.
36−optional :: Query a -> Query (MaybeTable Expr a)
31+optional :: Query a -> Query (MaybeTable a)
37−optional = mapOpaleye $ Opaleye.optionalInternal $ \tag a -> MaybeTable
32+optional = mapOpaleye $ Opaleye.QueryArr . go
38− { tag = fromPrimExpr $ fromColumn tag
33+ where
39− , just = pure a
34+ go query (i, left, tag) =
40− }
35+ (MaybeTable (fromExpr t') a, join, Opaleye.next tag')
36+ where
37+ (MaybeTable Tag {expr = t} a, right, tag') =
38+ Opaleye.runSimpleQueryArr (pure <$> query) (i, tag)
39+ (t', bindings) = Opaleye.run $
40+ Opaleye.runUnpackspec unpackspec (Opaleye.extractAttr "maybe" tag') t
41+ join = Opaleye.Join Opaleye.LeftJoin condition [] bindings left right
42+ condition = toPrimExpr true
41
43
42
44
43-- | Filter out 'MaybeTable's, returning only the tables that are not-null.
45-- | Filter out 'MaybeTable's, returning only the tables that are not-null.
@@ -45,24 +47,92 @@ optional = mapOpaleye $ Opaleye.optionalInternal $ \tag a -> MaybeTable
45-- This operation can be used to "undo" the effect of 'optional', which
47-- This operation can be used to "undo" the effect of 'optional', which
46-- operationally is like turning a @LEFT JOIN@ back into a full @JOIN@. You
48-- operationally is like turning a @LEFT JOIN@ back into a full @JOIN@. You
47-- can think of this as analogous to 'Data.Maybe.catMaybes'.
49-- can think of this as analogous to 'Data.Maybe.catMaybes'.
50+--
51+-- To see this in action, first consider the following 'optional' query:
52+--
53+-- >>> :{
54+-- select c $ do
55+-- author <- each authorSchema
56+-- maybeRel8 <- optional $
57+-- each projectSchema
58+-- >>= filter (\p -> projectAuthorId p ==. authorId author)
59+-- >>= filter (\p -> projectName p ==. "rel8")
60+-- return (authorName author, projectName <$> maybeRel8)
61+-- :}
62+-- [("Ollie",Just "rel8"),("Bryan O'Sullivan",Nothing),("Emily Pillmore",Nothing)]
63+--
64+-- Here @optional@ is acting as a @LEFT JOIN@. We can turn this into a proper
65+-- join by using @catMaybeTable@ to filter out rows where the join failed:
66+--
67+-- >>> :{
68+-- select c $ do
69+-- author <- each authorSchema
70+-- maybeRel8 <- optional $
71+-- each projectSchema
72+-- >>= filter (\p -> projectAuthorId p ==. authorId author)
73+-- >>= filter (\p -> projectName p ==. "rel8")
74+-- rel8 <- catMaybeTable maybeRel8
75+-- return (authorName author, projectName rel8)
76+-- :}
77+-- [("Ollie","rel8")]
48−catMaybeTable :: MaybeTable Expr a -> Query a
78+catMaybeTable :: MaybeTable a -> Query a
49catMaybeTable ma@(MaybeTable _ a) = do
79catMaybeTable ma@(MaybeTable _ a) = do
50 where_ $ isJustTable ma
80 where_ $ isJustTable ma
51− pure (extract a)
81+ pure a
82+
83+
84+-- | @bindMaybeTable f x@ is similar to the monadic bind (@>>=@) operation. It
85+-- allows you to "extend" an optional query with another query. If either the
86+-- input or output are 'noTable', then the result is 'noTable'.
87+--
88+-- This is similar to 'traverseMaybeTable', followed by a @join@ on the
89+-- resulting @MaybeTable@s.
90+--
91+-- >>> select c $ bindMaybeTable (optional . values . pure . not_) =<< optional (values [lit True])
92+-- [Just False]
93+--
94+-- >>> select c $ bindMaybeTable (\_ -> return (noTable :: MaybeTable (Expr Bool))) =<< optional (values [lit True])
95+-- [Nothing]
96+--
97+-- >>> select c $ bindMaybeTable (optional . values . pure . not_) =<< return (noTable :: MaybeTable (Expr Bool))
98+-- [Nothing]
99+bindMaybeTable :: Monad m
100+ => (a -> m (MaybeTable b)) -> MaybeTable a -> m (MaybeTable b)
101+bindMaybeTable query (MaybeTable input a) = do
102+ MaybeTable output b <- query a
103+ pure $ MaybeTable (input <> output) b
52
104
53
105
54-- | Extend an optional query with another query. This is useful if you want
106-- | Extend an optional query with another query. This is useful if you want
55-- to step through multiple @LEFT JOINs@.
107-- to step through multiple @LEFT JOINs@.
56--
108--
57-- Note that @traverseMaybeTable@ takes a @a -> Query b@ function, which means
109-- Note that @traverseMaybeTable@ takes a @a -> Query b@ function, which means
58−-- you also have the ability to "expand" one row into multiple rows. If the
110+-- you also have the ability to "expand" one row into multiple rows.
111+--
112+-- >>> :{
113+-- duplicate :: Expr Bool -> Query (Expr Bool)
114+-- duplicate x = unionAll (return x) (return x)
115+-- :}
116+--
117+-- >>> select c $ traverseMaybeTable duplicate =<< optional (values [lit True])
118+-- [Just True,Just True]
119+--
59−-- @a -> Query b@ function returns no rows, then the resulting query will also
120+-- Note that if the @a -> Query b@ function returns no rows, then the resulting
121+-- query will also have no rows:
122+--
123+-- >>> select c $ traverseMaybeTable (limit 0 . pure) =<< optional (values [lit True])
124+-- []
125+--
60−-- have no rows. However, regardless of the given @a -> Query b@ function, if
126+-- However, regardless of the given @a -> Query b@ function, if the input is
61−-- the input is @nothingTable@, you will always get exactly one @nothingTable@
127+-- @noTable@, you will always get exactly one @noTable@ back:
62−-- back.
128+--
129+-- >>> select c $ traverseMaybeTable duplicate (noTable :: MaybeTable (Expr Bool))
130+-- [Nothing]
131+--
132+-- >>> select c $ traverseMaybeTable (limit 0 . pure) (noTable :: MaybeTable (Expr Bool))
133+-- [Nothing]
63−traverseMaybeTable :: (a -> Query b) -> MaybeTable Expr a -> Query (MaybeTable Expr b)
134+traverseMaybeTable :: (a -> Query b) -> MaybeTable a -> Query (MaybeTable b)
64traverseMaybeTable query ma@(MaybeTable input _) = do
135traverseMaybeTable query ma@(MaybeTable input _) = do
65− optional (query =<< catMaybeTable ma) >>= \case
136+ MaybeTable output b <- optional (query =<< catMaybeTable ma)
66− MaybeTable output b -> do
67− where_ $ output ==. input
137+ where_ $ expr output ==. expr input
68− pure $ MaybeTable input b
138+ pure $ MaybeTable input b
src/Rel8/Query/Null.hs+18−18
@@ -1,8 +1,5 @@
1−{-# language FlexibleContexts #-}
2−
3module Rel8.Query.Null
1module Rel8.Query.Null
4− ( catNull
2+ ( catNullable
5− , catNullTable
6 )
3 )
7where
4where
8
5
@@ -12,8 +9,6 @@ import Prelude
12-- rel8
9-- rel8
13import Rel8.Expr ( Expr )
10import Rel8.Expr ( Expr )
14import Rel8.Expr.Null ( isNonNull, unsafeUnnullify )
11import Rel8.Expr.Null ( isNonNull, unsafeUnnullify )
15−import Rel8.Table ( Table )
16−import Rel8.Table.Null ( NullTable, isNonNullTable, unsafeUnnullifyTable )
17import Rel8.Query ( Query )
12import Rel8.Query ( Query )
18import Rel8.Query.Filter ( where_ )
13import Rel8.Query.Filter ( where_ )
19
14
@@ -22,17 +17,22 @@ import Rel8.Query.Filter ( where_ )
22-- @null@s.
17-- @null@s.
23--
18--
24-- Corresponds to 'Data.Maybe.catMaybes'.
19-- Corresponds to 'Data.Maybe.catMaybes'.
20+--
21+-- >>> select c $ pure (nullExpr :: Expr (Maybe Bool))
22+-- [Nothing]
23+--
24+-- >>> select c $ catNullable (nullExpr :: Expr (Maybe Bool))
25+-- []
26+--
27+-- >>> select c $ catNullable (lit (Just True))
28+-- [True]
29+--
30+-- Notice how in the last example a @Bool@ is returned (rather than @Maybe
31+-- Bool@):
32+--
33+-- >>> :t catNullable (lit (Just True))
34+-- catMaybe (lit (Just True)) :: Query (Expr Bool)
25−catNull :: Expr (Maybe a) -> Query (Expr a)
35+catNullable :: Expr (Maybe a) -> Query (Expr a)
26−catNull a = do
36+catNullable a = do
27 where_ $ isNonNull a
37 where_ $ isNonNull a
28 pure $ unsafeUnnullify a
38 pure $ unsafeUnnullify a
29−
30−
31−-- | Filter a 'Query' that might return @nullTable@ to a 'Query' without any
32−-- @nullTable@s.
33−--
34−-- Corresponds to 'Data.Maybe.catMaybes'.
35−catNullTable :: Table Expr a => NullTable Expr a -> Query a
36−catNullTable a = do
37− where_ $ isNonNullTable a
38− pure $ unsafeUnnullifyTable a
src/Rel8/Query/Opaleye.hs+5−41
@@ -1,70 +1,34 @@
1−{-# language TupleSections #-}
2−
3module Rel8.Query.Opaleye
1module Rel8.Query.Opaleye
4 ( fromOpaleye
2 ( fromOpaleye
5 , toOpaleye
3 , toOpaleye
6 , mapOpaleye
4 , mapOpaleye
7 , zipOpaleyeWith
5 , zipOpaleyeWith
8− , unsafePeekQuery
9 )
6 )
10where
7where
11
8
12-- base
9-- base
13−import Control.Applicative ( liftA2 )
14import Prelude
10import Prelude
15
11
16-- opaleye
12-- opaleye
17−import qualified Opaleye.Internal.QueryArr as Opaleye
13+import qualified Opaleye.Select as Opaleye
18−import qualified Opaleye.Internal.Tag as Opaleye
19
14
20-- rel8
15-- rel8
21import {-# SOURCE #-} Rel8.Query ( Query( Query ) )
16import {-# SOURCE #-} Rel8.Query ( Query( Query ) )
22
17
23
18
24fromOpaleye :: Opaleye.Select a -> Query a
19fromOpaleye :: Opaleye.Select a -> Query a
25−fromOpaleye = Query . pure . fmap pure
20+fromOpaleye = Query
26
21
27
22
28toOpaleye :: Query a -> Opaleye.Select a
23toOpaleye :: Query a -> Opaleye.Select a
29−toOpaleye (Query a) = snd <$> a mempty
24+toOpaleye (Query a) = a
30
25
31
26
32mapOpaleye :: (Opaleye.Select a -> Opaleye.Select b) -> Query a -> Query b
27mapOpaleye :: (Opaleye.Select a -> Opaleye.Select b) -> Query a -> Query b
33−mapOpaleye f (Query a) = Query (fmap (mapping f) a)
28+mapOpaleye f = fromOpaleye . f . toOpaleye
34
29
35
30
36zipOpaleyeWith :: ()
31zipOpaleyeWith :: ()
37 => (Opaleye.Select a -> Opaleye.Select b -> Opaleye.Select c)
32 => (Opaleye.Select a -> Opaleye.Select b -> Opaleye.Select c)
38 -> Query a -> Query b -> Query c
33 -> Query a -> Query b -> Query c
39−zipOpaleyeWith f (Query a) (Query b) = Query $ liftA2 (zipping f) a b
34+zipOpaleyeWith f a b = fromOpaleye $ f (toOpaleye a) (toOpaleye b)
40−
41−
42−unsafePeekQuery :: Query a -> a
43−unsafePeekQuery (Query q) = case q mempty of
44− f -> case Opaleye.runStateQueryArr f () Opaleye.start of
45− ((_, a), _, _) -> a
46−
47−
48−mapping :: ()
49− => (Opaleye.Select a -> Opaleye.Select b)
50− -> Opaleye.Select (m, a) -> Opaleye.Select (m, b)
51−mapping f q = Opaleye.stateQueryArr $ \_ tag ->
52− let
53− ((m, _), _, _) = Opaleye.runStateQueryArr q () tag
54− q' = (m,) <$> f (snd <$> q)
55− in
56− Opaleye.runStateQueryArr q' () tag
57−
58−
59−zipping :: Semigroup m
60− => (Opaleye.Select a -> Opaleye.Select b -> Opaleye.Select c)
61− -> Opaleye.Select (m, a) -> Opaleye.Select (m, b) -> Opaleye.Select (m, c)
62−zipping f q q' =
63− Opaleye.stateQueryArr $ \_ tag ->
64− let
65− ((m, _), _, _) = Opaleye.runStateQueryArr q () tag
66− ((m', _), _, _) = Opaleye.runStateQueryArr q' () tag
67− m'' = m <> m'
68− q'' = (m'',) <$> f (snd <$> q) (snd <$> q')
69− in
70− Opaleye.runStateQueryArr q'' () tag
src/Rel8/Query/Rebind.hsdeleted−27
@@ -1,27 +0,0 @@
1−{-# language FlexibleContexts #-}
2−
3−module Rel8.Query.Rebind
4− ( rebind
5− )
6−where
7−
8−-- base
9−import Prelude
10−import Control.Arrow ((<<<))
11−
12−-- opaleye
13−import qualified Opaleye.Internal.Rebind as Opaleye
14−
15−-- rel8
16−import Rel8.Expr ( Expr )
17−import Rel8.Query ( Query )
18−import Rel8.Table ( Table )
19−import Rel8.Table.Opaleye ( unpackspec )
20−import Rel8.Query.Opaleye (fromOpaleye)
21−
22−
23−-- | 'rebind' takes a variable name, some expressions, and binds each of them
24−-- to a new variable in the SQL. The @a@ returned consists only of these
25−-- variables. It's essentially a @let@ binding for Postgres expressions.
26−rebind :: Table Expr a => String -> a -> Query a
27−rebind prefix a = fromOpaleye (Opaleye.rebindExplicitPrefix prefix unpackspec <<< pure a)
src/Rel8/Query/SQL.hs+58−6
@@ -1,21 +1,73 @@
1{-# language FlexibleContexts #-}
1{-# language FlexibleContexts #-}
2−{-# language MonoLocalBinds #-}
2+{-# language TypeFamilies #-}
3+{-# language ViewPatterns #-}
3
4
4module Rel8.Query.SQL
5module Rel8.Query.SQL
5 ( showQuery
6 ( showQuery
7+ , sqlForQuery, sqlForQueryWithNames
6 )
8 )
7where
9where
8
10
9-- base
11-- base
12+import Data.Foldable ( fold )
13+import Data.Functor.Const ( Const( Const ), getConst )
14+import Data.Void ( Void )
10import Prelude
15import Prelude
11
16
17+-- opaleye
18+import qualified Opaleye.Internal.HaskellDB.Sql as Opaleye
19+import qualified Opaleye.Internal.PrimQuery as Opaleye
20+import qualified Opaleye.Internal.Print as Opaleye
21+import qualified Opaleye.Internal.Optimize as Opaleye
22+import qualified Opaleye.Internal.QueryArr as Opaleye hiding ( Select )
23+import qualified Opaleye.Internal.Sql as Opaleye
24+
12-- rel8
25-- rel8
13−import Rel8.Expr ( Expr )
26+import Rel8.Expr ( Expr, Col(..) )
27+import Rel8.Expr.Opaleye ( toPrimExpr )
14import Rel8.Query ( Query )
28import Rel8.Query ( Query )
15−import Rel8.Statement.Select ( ppSelect )
29+import Rel8.Query.Opaleye ( toOpaleye )
16−import Rel8.Table ( Table )
30+import Rel8.Schema.Name ( Selects, Col(..) )
31+import Rel8.Schema.HTable ( htabulateA, hfield )
32+import Rel8.Table ( Table, toColumns )
33+import Rel8.Table.Name ( namesFromLabels )
17
34
18
35
19−-- | Convert a 'Query' to a 'String' containing a @SELECT@ statement.
36+-- | Convert a query to a 'String' containing the query as a @SELECT@
37+-- statement.
20showQuery :: Table Expr a => Query a -> String
38showQuery :: Table Expr a => Query a -> String
21−showQuery = show . ppSelect
39+showQuery = fold . sqlForQuery
40+
41+
42+sqlForQuery :: Table Expr a
43+ => Query a -> Maybe String
44+sqlForQuery = sqlForQueryWithNames namesFromLabels . fmap toColumns
45+
46+
47+sqlForQueryWithNames :: Selects names exprs
48+ => names -> Query exprs -> Maybe String
49+sqlForQueryWithNames names query =
50+ show . Opaleye.ppSql . selectFrom names exprs <$> optimize primQuery
51+ where
52+ (exprs, primQuery, _) =
53+ Opaleye.runSimpleQueryArrStart (toOpaleye query) ()
54+
55+
56+optimize :: Opaleye.PrimQuery' a -> Maybe (Opaleye.PrimQuery' Void)
57+optimize = Opaleye.removeEmpty . Opaleye.optimize
58+
59+
60+selectFrom :: Selects names exprs
61+ => names -> exprs -> Opaleye.PrimQuery' Void -> Opaleye.Select
62+selectFrom (toColumns -> names) (toColumns -> exprs) query =
63+ Opaleye.SelectFrom $ Opaleye.newSelect
64+ { Opaleye.attrs = Opaleye.SelectAttrs attributes
65+ , Opaleye.tables = Opaleye.oneTable select
66+ }
67+ where
68+ select = Opaleye.foldPrimQuery Opaleye.sqlQueryGenerator query
69+ attributes = getConst $ htabulateA $ \field -> case hfield names field of
70+ NameCol name -> case hfield exprs field of
71+ DB (toPrimExpr -> expr) -> Const (pure (makeAttr name expr))
72+ makeAttr label expr =
73+ (Opaleye.sqlExpr expr, Just (Opaleye.SqlColumn label))
src/Rel8/Query/Set.hs+24−6
@@ -23,36 +23,54 @@ import Rel8.Table.Opaleye ( binaryspec )
23
23
24
24
25-- | Combine the results of two queries of the same type, collapsing
25-- | Combine the results of two queries of the same type, collapsing
26−-- duplicates. @union a b@ is the same as the SQL statement @a UNION b@.
26+-- duplicates. @union a b@ is the same as the SQL statement @x UNION b@.
27+--
28+-- >>> select c $ values [lit True, lit True, lit False] `union` values [lit True]
29+-- [False,True]
27union :: EqTable a => Query a -> Query a -> Query a
30union :: EqTable a => Query a -> Query a -> Query a
28union = zipOpaleyeWith (Opaleye.unionExplicit binaryspec)
31union = zipOpaleyeWith (Opaleye.unionExplicit binaryspec)
29
32
30
33
31-- | Combine the results of two queries of the same type, retaining duplicates.
34-- | Combine the results of two queries of the same type, retaining duplicates.
32−-- @unionAll a b@ is the same as the SQL statement @a UNION ALL b@.
35+-- @unionAll a b@ is the same as the SQL statement @x UNION ALL b@.
36+--
37+-- >>> select c $ values [lit True, lit True, lit False] `unionAll` values [lit True]
38+-- [True,True,False,True]
33unionAll :: Table Expr a => Query a -> Query a -> Query a
39unionAll :: Table Expr a => Query a -> Query a -> Query a
34unionAll = zipOpaleyeWith (Opaleye.unionAllExplicit binaryspec)
40unionAll = zipOpaleyeWith (Opaleye.unionAllExplicit binaryspec)
35
41
36
42
37-- | Find the intersection of two queries, collapsing duplicates. @intersect a
43-- | Find the intersection of two queries, collapsing duplicates. @intersect a
38−-- b@ is the same as the SQL statement @a INTERSECT b@.
44+-- b@ is the same as the SQL statement @x INTERSECT b@.
45+--
46+-- >>> select c $ values [lit True, lit True, lit False] `intersect` values [lit True]
47+-- [True]
39intersect :: EqTable a => Query a -> Query a -> Query a
48intersect :: EqTable a => Query a -> Query a -> Query a
40intersect = zipOpaleyeWith (Opaleye.intersectExplicit binaryspec)
49intersect = zipOpaleyeWith (Opaleye.intersectExplicit binaryspec)
41
50
42
51
43-- | Find the intersection of two queries, retaining duplicates. @intersectAll
52-- | Find the intersection of two queries, retaining duplicates. @intersectAll
44−-- a b@ is the same as the SQL statement @a INTERSECT ALL b@.
53+-- a b@ is the same as the SQL statement @x INTERSECT ALL b@.
54+--
55+-- >>> select c $ values [lit True, lit True, lit False] `intersectAll` values [lit True, lit True]
56+-- [True,True]
45intersectAll :: EqTable a => Query a -> Query a -> Query a
57intersectAll :: EqTable a => Query a -> Query a -> Query a
46intersectAll = zipOpaleyeWith (Opaleye.intersectAllExplicit binaryspec)
58intersectAll = zipOpaleyeWith (Opaleye.intersectAllExplicit binaryspec)
47
59
48
60
49-- | Find the difference of two queries, collapsing duplicates @except a b@ is
61-- | Find the difference of two queries, collapsing duplicates @except a b@ is
50−-- the same as the SQL statement @a EXCEPT b@.
62+-- the same as the SQL statement @x INTERSECT b@.
63+--
64+-- >>> select c $ values [lit True, lit False, lit False] `except` values [lit True]
65+-- [False]
51except :: EqTable a => Query a -> Query a -> Query a
66except :: EqTable a => Query a -> Query a -> Query a
52except = zipOpaleyeWith (Opaleye.exceptExplicit binaryspec)
67except = zipOpaleyeWith (Opaleye.exceptExplicit binaryspec)
53
68
54
69
55-- | Find the difference of two queries, retaining duplicates. @exceptAll a b@
70-- | Find the difference of two queries, retaining duplicates. @exceptAll a b@
56−-- is the same as the SQL statement @a EXCEPT ALL b@.
71+-- is the same as the SQL statement @x EXCEPT ALL b@.
72+--
73+-- >>> select c $ values [lit True, lit False, lit False] `exceptAll` values [lit True]
74+-- [False,False]
57exceptAll :: EqTable a => Query a -> Query a -> Query a
75exceptAll :: EqTable a => Query a -> Query a -> Query a
58exceptAll = zipOpaleyeWith (Opaleye.exceptAllExplicit binaryspec)
76exceptAll = zipOpaleyeWith (Opaleye.exceptAllExplicit binaryspec)
src/Rel8/Query/These.hs+45−52
@@ -1,5 +1,4 @@
1{-# language FlexibleContexts #-}
1{-# language FlexibleContexts #-}
2−{-# language GADTs #-}
3
2
4module Rel8.Query.These
3module Rel8.Query.These
5 ( alignBy
4 ( alignBy
@@ -8,6 +7,7 @@ module Rel8.Query.These
8 , keepThisTable, loseThisTable
7 , keepThisTable, loseThisTable
9 , keepThatTable, loseThatTable
8 , keepThatTable, loseThatTable
10 , keepThoseTable, loseThoseTable
9 , keepThoseTable, loseThoseTable
10+ , bindTheseTable
11 , bitraverseTheseTable
11 , bitraverseTheseTable
12 )
12 )
13where
13where
@@ -15,29 +15,27 @@ where
15-- base
15-- base
16import Prelude
16import Prelude
17
17
18−-- comonad
19−import Control.Comonad ( extract )
20−
21-- opaleye
18-- opaleye
22−import qualified Opaleye.Internal.PackMap as Opaleye
19+import qualified Opaleye.Internal.Join as Opaleye
23import qualified Opaleye.Internal.PrimQuery as Opaleye
20import qualified Opaleye.Internal.PrimQuery as Opaleye
24−import qualified Opaleye.Internal.QueryArr as Opaleye
25−import qualified Opaleye.Internal.Tag as Opaleye
26
21
27-- rel8
22-- rel8
28import Rel8.Expr ( Expr )
23import Rel8.Expr ( Expr )
29import Rel8.Expr.Bool ( boolExpr, not_ )
24import Rel8.Expr.Bool ( boolExpr, not_ )
30import Rel8.Expr.Eq ( (==.) )
25import Rel8.Expr.Eq ( (==.) )
31−import Rel8.Expr.Opaleye ( toPrimExpr, traversePrimExpr )
26+import Rel8.Expr.Opaleye ( toColumn, toPrimExpr )
32import Rel8.Expr.Serialize ( litExpr )
27import Rel8.Expr.Serialize ( litExpr )
33import Rel8.Query ( Query )
28import Rel8.Query ( Query )
34import Rel8.Query.Filter ( where_ )
29import Rel8.Query.Filter ( where_ )
35import Rel8.Query.Maybe ( optional )
30import Rel8.Query.Maybe ( optional )
36import Rel8.Query.Opaleye ( zipOpaleyeWith )
31import Rel8.Query.Opaleye ( zipOpaleyeWith )
32+import Rel8.Table ( Table )
37import Rel8.Table.Either ( EitherTable( EitherTable ) )
33import Rel8.Table.Either ( EitherTable( EitherTable ) )
38import Rel8.Table.Maybe ( MaybeTable( MaybeTable ), isJustTable )
34import Rel8.Table.Maybe ( MaybeTable( MaybeTable ), isJustTable )
35+import Rel8.Table.Opaleye ( unpackspec )
36+import Rel8.Table.Tag ( Tag(..) )
39import Rel8.Table.These
37import Rel8.Table.These
40− ( TheseTable( TheseTable, here, there )
38+ ( TheseTable( TheseTable )
41 , hasHereTable, hasThereTable
39 , hasHereTable, hasThereTable
42 , isThisTable, isThatTable, isThoseTable
40 , isThisTable, isThatTable, isThoseTable
43 )
41 )
@@ -45,91 +43,86 @@ import Rel8.Type.Tag ( EitherTag( IsLeft, IsRight ) )
45
43
46
44
47-- | Corresponds to a @FULL OUTER JOIN@ between two queries.
45-- | Corresponds to a @FULL OUTER JOIN@ between two queries.
48−alignBy :: ()
46+alignBy :: (Table Expr a, Table Expr b)
49 => (a -> b -> Expr Bool)
47 => (a -> b -> Expr Bool)
50− -> Query a -> Query b -> Query (TheseTable Expr a b)
48+ -> Query a -> Query b -> Query (TheseTable a b)
51−alignBy condition = zipOpaleyeWith $ \left right -> Opaleye.stateQueryArr $ \_ t -> case t of
49+alignBy condition as bs =
52− tag -> (tab, join', tag''')
50+ uncurry TheseTable <$> zipOpaleyeWith fullOuterJoin as bs
53− where
51+ where
54− (ma, left', tag') = Opaleye.runStateQueryArr (pure <$> left) () tag
52+ fullOuterJoin a b =
55− (mb, right', tag'') = Opaleye.runStateQueryArr (pure <$> right) () tag'
53+ Opaleye.joinExplicit unpackspec unpackspec pure pure full a b on
56− MaybeTable hasHere a = ma
54+ where
57− MaybeTable hasThere b = mb
58− (hasHere', lbindings) = Opaleye.run $ do
59− traversePrimExpr (Opaleye.extractAttr "hasHere" tag'') hasHere
60− (hasThere', rbindings) = Opaleye.run $ do
61− traversePrimExpr (Opaleye.extractAttr "hasThere" tag'') hasThere
62− tag''' = Opaleye.next tag''
63− join = Opaleye.Join Opaleye.FullJoin on left'' right''
55+ full = Opaleye.FullJoin
64− where
56+ on = toColumn . toPrimExpr . uncurry condition
65− on = toPrimExpr $ condition (extract a) (extract b)
57+
66− left'' = (Opaleye.NonLateral, Opaleye.toPrimQuery (left' <> Opaleye.aRebind lbindings))
58+
67− right'' = (Opaleye.NonLateral, Opaleye.toPrimQuery (right' <> Opaleye.aRebind rbindings))
68− ma' = MaybeTable hasHere' a
69− mb' = MaybeTable hasThere' b
70− tab = TheseTable {here = ma', there = mb'}
71− join' = Opaleye.aProduct join
72−
73−
74−keepHereTable :: TheseTable Expr a b -> Query (a, MaybeTable Expr b)
59+keepHereTable :: TheseTable a b -> Query (a, MaybeTable b)
75keepHereTable = loseThatTable
60keepHereTable = loseThatTable
76
61
77
62
78−loseHereTable :: TheseTable Expr a b -> Query b
63+loseHereTable :: TheseTable a b -> Query b
79loseHereTable = keepThatTable
64loseHereTable = keepThatTable
80
65
81
66
82−keepThereTable :: TheseTable Expr a b -> Query (MaybeTable Expr a, b)
67+keepThereTable :: TheseTable a b -> Query (MaybeTable a, b)
83keepThereTable = loseThisTable
68keepThereTable = loseThisTable
84
69
85
70
86−loseThereTable :: TheseTable Expr a b -> Query a
71+loseThereTable :: TheseTable a b -> Query a
87loseThereTable = keepThisTable
72loseThereTable = keepThisTable
88
73
89
74
90−keepThisTable :: TheseTable Expr a b -> Query a
75+keepThisTable :: TheseTable a b -> Query a
91keepThisTable t@(TheseTable (MaybeTable _ a) _) = do
76keepThisTable t@(TheseTable (MaybeTable _ a) _) = do
92 where_ $ isThisTable t
77 where_ $ isThisTable t
93− pure (extract a)
78+ pure a
94
79
95
80
96−loseThisTable :: TheseTable Expr a b -> Query (MaybeTable Expr a, b)
81+loseThisTable :: TheseTable a b -> Query (MaybeTable a, b)
97loseThisTable t@(TheseTable ma (MaybeTable _ b)) = do
82loseThisTable t@(TheseTable ma (MaybeTable _ b)) = do
98 where_ $ not_ $ isThisTable t
83 where_ $ not_ $ isThisTable t
99− pure (ma, extract b)
84+ pure (ma, b)
100
85
101
86
102−keepThatTable :: TheseTable Expr a b -> Query b
87+keepThatTable :: TheseTable a b -> Query b
103keepThatTable t@(TheseTable _ (MaybeTable _ b)) = do
88keepThatTable t@(TheseTable _ (MaybeTable _ b)) = do
104 where_ $ isThatTable t
89 where_ $ isThatTable t
105− pure (extract b)
90+ pure b
106
91
107
92
108−loseThatTable :: TheseTable Expr a b -> Query (a, MaybeTable Expr b)
93+loseThatTable :: TheseTable a b -> Query (a, MaybeTable b)
109loseThatTable t@(TheseTable (MaybeTable _ a) mb) = do
94loseThatTable t@(TheseTable (MaybeTable _ a) mb) = do
110 where_ $ not_ $ isThatTable t
95 where_ $ not_ $ isThatTable t
111− pure (extract a, mb)
96+ pure (a, mb)
112
97
113
98
114−keepThoseTable :: TheseTable Expr a b -> Query (a, b)
99+keepThoseTable :: TheseTable a b -> Query (a, b)
115keepThoseTable t@(TheseTable (MaybeTable _ a) (MaybeTable _ b)) = do
100keepThoseTable t@(TheseTable (MaybeTable _ a) (MaybeTable _ b)) = do
116 where_ $ isThoseTable t
101 where_ $ isThoseTable t
117− pure (extract a, extract b)
102+ pure (a, b)
118
103
119
104
120−loseThoseTable :: TheseTable Expr a b -> Query (EitherTable Expr a b)
105+loseThoseTable :: TheseTable a b -> Query (EitherTable a b)
121loseThoseTable t@(TheseTable (MaybeTable _ a) (MaybeTable _ b)) = do
106loseThoseTable t@(TheseTable (MaybeTable _ a) (MaybeTable _ b)) = do
122 where_ $ not_ $ isThoseTable t
107 where_ $ not_ $ isThoseTable t
123− pure $ EitherTable tag a b
108+ pure $ EitherTable result a b
124 where
109 where
125 tag = boolExpr (litExpr IsLeft) (litExpr IsRight) (isThatTable t)
110 tag = boolExpr (litExpr IsLeft) (litExpr IsRight) (isThatTable t)
111+ result = (mempty `asTypeOf` result) {expr = tag}
112+
113+
114+bindTheseTable :: (Table Expr a, Semigroup a, Monad m)
115+ => (i -> m (TheseTable a b)) -> TheseTable a i -> m (TheseTable a b)
116+bindTheseTable query (TheseTable here (MaybeTable input i)) = do
117+ TheseTable here' (MaybeTable output b) <- query i
118+ pure $ TheseTable (here <> here') (MaybeTable (input <> output) b)
126
119
127
120
128bitraverseTheseTable :: ()
121bitraverseTheseTable :: ()
129 => (a -> Query c)
122 => (a -> Query c)
130 -> (b -> Query d)
123 -> (b -> Query d)
131− -> TheseTable Expr a b
124+ -> TheseTable a b
132− -> Query (TheseTable Expr c d)
125+ -> Query (TheseTable c d)
133bitraverseTheseTable f g t = do
126bitraverseTheseTable f g t = do
134 mc <- optional (f . fst =<< keepHereTable t)
127 mc <- optional (f . fst =<< keepHereTable t)
135 md <- optional (g . snd =<< keepThereTable t)
128 md <- optional (g . snd =<< keepThereTable t)
src/Rel8/Query/Values.hs+7−1
@@ -21,7 +21,13 @@ import Rel8.Table.Opaleye ( valuesspec )
21
21
22
22
23-- | Construct a query that returns the given input list of rows. This is like
23-- | Construct a query that returns the given input list of rows. This is like
24−-- folding a list of 'return' statements under 'Rel8.union', but uses the SQL
24+-- folding a list of 'return' statements under 'union', but uses the SQL
25-- @VALUES@ expression for efficiency.
25-- @VALUES@ expression for efficiency.
26+--
27+-- Typically @values@ will be used with 'lit':
28+--
29+-- >>> mapM_ Data.Text.IO.putStrLn =<< select c (values [ lit "Hello", lit "World!" ])
30+-- Hello
31+-- World!
26values :: (Table Expr a, Foldable f) => f a -> Query a
32values :: (Table Expr a, Foldable f) => f a -> Query a
27values = fromOpaleye . Opaleye.valuesExplicit valuesspec . toList
33values = fromOpaleye . Opaleye.valuesExplicit valuesspec . toList
src/Rel8/Query/Window.hsdeleted−26
@@ -1,26 +0,0 @@
1−module Rel8.Query.Window
2− ( window
3− )
4−where
5−
6−-- base
7−import Prelude ()
8−
9−-- opaleye
10−import qualified Opaleye.Window as Opaleye
11−
12−-- rel8
13−import Rel8.Query ( Query )
14−import Rel8.Query.Opaleye ( mapOpaleye )
15−import Rel8.Window ( Window( Window ) )
16−
17−
18−-- | 'window' runs a query composed of expressions containing
19−-- [window functions](https://www.postgresql.org/docs/current/tutorial-window.html).
20−-- 'window' is similar to 'Rel8.aggregate', with the main difference being
21−-- that in a window query, each input row corresponds to one output row,
22−-- whereas aggregation queries fold the entire input query down into a single
23−-- row. To put this into a Haskell context, 'Rel8.aggregate' is to 'foldl' as
24−-- 'window' is to 'scanl'.
25−window :: Window a b -> Query a -> Query b
26−window (Window a) = mapOpaleye (Opaleye.runWindows a)
src/Rel8/Schema/Column.hsnew file+168
@@ -0,0 +1,168 @@
1+{-# language DataKinds #-}
2+{-# language TypeFamilies #-}
3+{-# language StandaloneKindSignatures #-}
4+
5+module Rel8.Schema.Column
6+ ( Column, Default, Label
7+ , HEither
8+ , HList
9+ , HMaybe
10+ , HNonEmpty
11+ , HThese
12+ )
13+where
14+
15+-- base
16+import Data.Functor.Identity ( Identity )
17+import Data.Kind ( Type )
18+import Data.List.NonEmpty ( NonEmpty )
19+import GHC.TypeLits ( Symbol )
20+import Prelude
21+
22+-- rel8
23+import Rel8.Aggregate ( Aggregate )
24+import Rel8.Expr ( Expr )
25+import Rel8.Kind.Labels ( Labels )
26+import Rel8.Kind.Necessity ( Necessity( Required, Optional ) )
27+import Rel8.Schema.Field ( Field )
28+import Rel8.Schema.Insert ( Insert )
29+import qualified Rel8.Schema.Kind as K
30+import Rel8.Schema.Name ( Name )
31+import Rel8.Schema.Structure
32+ ( Structure
33+ , Shape( Either, List, Maybe, NonEmpty, These )
34+ , Shape1
35+ , Shape2
36+ )
37+import Rel8.Table.Either ( EitherTable )
38+import Rel8.Table.List ( ListTable )
39+import Rel8.Table.Maybe ( MaybeTable )
40+import Rel8.Table.NonEmpty ( NonEmptyTable )
41+import Rel8.Table.These ( TheseTable )
42+
43+-- these
44+import Data.These ( These )
45+
46+
47+type Label :: Symbol -> Type -> Type
48+data Label label a
49+
50+
51+type Default :: Type -> Type
52+data Default a
53+
54+
55+type GetLabel :: Type -> Labels
56+type family GetLabel a where
57+ GetLabel (Label label _) = '[label]
58+ GetLabel _ = '[]
59+
60+
61+type UnwrapLabel :: Type -> Type
62+type family UnwrapLabel a where
63+ UnwrapLabel (Label _ a) = a
64+ UnwrapLabel a = a
65+
66+
67+type GetNecessity :: Type -> Necessity
68+type family GetNecessity a where
69+ GetNecessity (Default _) = 'Optional
70+ GetNecessity _ = 'Required
71+
72+
73+type UnwrapDefault :: Type -> Type
74+type family UnwrapDefault a where
75+ UnwrapDefault (Default a) = a
76+ UnwrapDefault a = a
77+
78+
79+-- | The @Column@ type family should be used to indicate which fields of your
80+-- data types are single columns in queries. This type family has special
81+-- support when a query is executed, allowing you to use a single data type for
82+-- both query data and rows decoded to Haskell.
83+--
84+-- To understand why this type family is special, let's consider a simple
85+-- higher-kinded data type of Haskell packages:
86+--
87+-- >>> :{
88+-- data Package f = Package
89+-- { packageName :: Column f Text
90+-- , packageAuthor :: Column f Text
91+-- }
92+-- :}
93+--
94+-- In queries, @f@ will be some type of 'Expr', and @Column Expr a@ reduces to
95+-- just @Expr a@:
96+--
97+-- >>> :t packageName (undefined :: Package Expr)
98+-- packageName (undefined :: Package Expr) :: Expr Text
99+--
100+-- When we 'select' queries of this type, @f@ will be instantiated as
101+-- @Identity@, at which point all wrapping entire disappears:
102+--
103+-- >>> :t packageName (undefined :: Package Identity)
104+-- packageName (undefined :: Package Identity) :: Text
105+--
106+-- In @rel8@ we try hard to always know what @f@ is, which means holes should
107+-- mention precise types, rather than the @Column@ type family. You should only
108+-- need to be aware of the type family when defining your table types.
109+type Column :: K.Context -> Type -> Type
110+type Column context a =
111+ Field context (GetLabel a)
112+ (GetNecessity (UnwrapLabel a))
113+ (UnwrapDefault (UnwrapLabel a))
114+
115+
116+type HEither :: K.Context -> Type -> Type -> Type
117+type family HEither context where
118+ HEither Structure = Shape2 'Either
119+ HEither Aggregate = EitherTable
120+ HEither Expr = EitherTable
121+ HEither Identity = Either
122+ HEither Insert = EitherTable
123+ HEither Name = EitherTable
124+ HEither _ = Either
125+
126+
127+type HList :: K.Context -> Type -> Type
128+type family HList context where
129+ HList Structure = Shape1 'List
130+ HList Aggregate = ListTable
131+ HList Expr = ListTable
132+ HList Identity = []
133+ HList Insert = ListTable
134+ HList Name = ListTable
135+ HList _ = []
136+
137+
138+type HMaybe :: K.Context -> Type -> Type
139+type family HMaybe context where
140+ HMaybe Structure = Shape1 'Maybe
141+ HMaybe Aggregate = MaybeTable
142+ HMaybe Expr = MaybeTable
143+ HMaybe Identity = Maybe
144+ HMaybe Insert = MaybeTable
145+ HMaybe Name = MaybeTable
146+ HMaybe _ = Maybe
147+
148+
149+type HNonEmpty :: K.Context -> Type -> Type
150+type family HNonEmpty context where
151+ HNonEmpty Structure = Shape1 'NonEmpty
152+ HNonEmpty Aggregate = NonEmptyTable
153+ HNonEmpty Expr = NonEmptyTable
154+ HNonEmpty Identity = NonEmpty
155+ HNonEmpty Insert = NonEmptyTable
156+ HNonEmpty Name = NonEmptyTable
157+ HNonEmpty _ = NonEmpty
158+
159+
160+type HThese :: K.Context -> Type -> Type -> Type
161+type family HThese context where
162+ HThese Structure = Shape2 'These
163+ HThese Aggregate = TheseTable
164+ HThese Expr = TheseTable
165+ HThese Identity = These
166+ HThese Insert = TheseTable
167+ HThese Name = TheseTable
168+ HThese _ = These
src/Rel8/Schema/Context.hsnew file+28
@@ -0,0 +1,28 @@
1+{-# language DataKinds #-}
2+{-# language GADTs #-}
3+{-# language StandaloneKindSignatures #-}
4+{-# language TypeFamilies #-}
5+
6+module Rel8.Schema.Context
7+ ( Interpretation(..), Col( Result )
8+ )
9+where
10+
11+-- base
12+import Data.Functor.Identity ( Identity )
13+import Data.Kind ( Constraint )
14+import Prelude ()
15+
16+-- rel8
17+import Rel8.Schema.Kind ( Context, HContext )
18+import Rel8.Schema.Spec ( Spec( Spec ) )
19+
20+
21+type Interpretation :: Context -> Constraint
22+class Interpretation context where
23+ data Col context :: HContext
24+
25+
26+instance Interpretation Identity where
27+ data Col Identity _spec where
28+ Result :: a -> Col Identity ('Spec labels necessity a)
src/Rel8/Schema/Context/Identity.hsnew file+199
@@ -0,0 +1,199 @@
1+{-# language DataKinds #-}
2+{-# language DisambiguateRecordFields #-}
3+{-# language NamedFieldPuns #-}
4+{-# language TypeFamilies #-}
5+
6+module Rel8.Schema.Context.Identity
7+ ( fromHEitherTable, toHEitherTable
8+ , fromHListTable, toHListTable
9+ , fromHMaybeTable, toHMaybeTable
10+ , fromHNonEmptyTable, toHNonEmptyTable
11+ , fromHTheseTable, toHTheseTable
12+ )
13+where
14+
15+-- base
16+import Data.Functor ( ($>) )
17+import Data.Functor.Identity ( Identity )
18+import Data.List.NonEmpty ( NonEmpty )
19+import Prelude hiding ( null )
20+
21+-- rel8
22+import Rel8.Schema.Context ( Col( Result ) )
23+import Rel8.Schema.HTable ( HTable )
24+import Rel8.Schema.HTable.Either ( HEitherTable(..) )
25+import Rel8.Schema.HTable.Identity ( HIdentity(..) )
26+import Rel8.Schema.HTable.Maybe ( HMaybeTable(..) )
27+import Rel8.Schema.HTable.List ( HListTable )
28+import Rel8.Schema.HTable.NonEmpty ( HNonEmptyTable )
29+import Rel8.Schema.HTable.Nullify ( hnulls, hnullify, hunnullify )
30+import Rel8.Schema.HTable.These ( HTheseTable(..) )
31+import Rel8.Schema.HTable.Vectorize ( hvectorize, hunvectorize )
32+import Rel8.Schema.Nullability
33+ ( Nullify
34+ , Nullability( Nullable, NonNullable )
35+ )
36+import Rel8.Schema.Spec ( Spec( Spec ), SSpec(..) )
37+import Rel8.Type.Tag ( EitherTag( IsLeft, IsRight ), MaybeTag( IsJust ) )
38+
39+-- these
40+import Data.These ( These( This, That, These ) )
41+import Data.These.Combinators ( justHere, justThere )
42+
43+
44+toHEitherTable :: (HTable t, HTable u)
45+ => Either (t (Col Identity)) (u (Col Identity))
46+ -> HEitherTable t u (Col Identity)
47+toHEitherTable = either hleft hright
48+ where
49+ hleft table = HEitherTable
50+ { htag = HIdentity (Result IsLeft)
51+ , hleft = hnullify nullifier table
52+ , hright = hnulls null
53+ }
54+ hright table = HEitherTable
55+ { htag = HIdentity (Result IsRight)
56+ , hleft = hnulls null
57+ , hright = hnullify nullifier table
58+ }
59+{-# INLINABLE toHEitherTable #-}
60+
61+
62+fromHEitherTable :: (HTable t, HTable u)
63+ => HEitherTable t u (Col Identity)
64+ -> Either (t (Col Identity)) (u (Col Identity))
65+fromHEitherTable HEitherTable {htag, hleft, hright} = case htag of
66+ HIdentity (Result tag) -> case tag of
67+ IsLeft -> maybe err Left $ hunnullify unnullifier hleft
68+ IsRight -> maybe err Right $ hunnullify unnullifier hright
69+ where
70+ err = error "fromHEitherTable: mismatch between tag and data"
71+{-# INLINABLE fromHEitherTable #-}
72+
73+
74+toHListTable :: HTable t => [t (Col Identity)] -> HListTable t (Col Identity)
75+toHListTable = hvectorize vectorizer
76+{-# INLINABLE toHListTable #-}
77+
78+
79+fromHListTable :: HTable t => HListTable t (Col Identity) -> [t (Col Identity)]
80+fromHListTable = hunvectorize unvectorizer
81+{-# INLINABLE fromHListTable #-}
82+
83+
84+toHMaybeTable :: HTable t => Maybe (t (Col Identity)) -> HMaybeTable t (Col Identity)
85+toHMaybeTable = maybe hnothing hjust
86+ where
87+ hnothing = HMaybeTable
88+ { htag = HIdentity (Result Nothing)
89+ , hjust = hnulls null
90+ }
91+ hjust table = HMaybeTable
92+ { htag = HIdentity (Result (Just IsJust))
93+ , hjust = hnullify nullifier table
94+ }
95+{-# INLINABLE toHMaybeTable #-}
96+
97+
98+fromHMaybeTable :: HTable t => HMaybeTable t (Col Identity) -> Maybe (t (Col Identity))
99+fromHMaybeTable HMaybeTable {htag, hjust} = case htag of
100+ HIdentity (Result tag) -> tag $>
101+ case hunnullify unnullifier hjust of
102+ Nothing -> error "fromHMaybeTable: mismatch between tag and data"
103+ Just just -> just
104+{-# INLINABLE fromHMaybeTable #-}
105+
106+
107+toHNonEmptyTable :: HTable t => NonEmpty (t (Col Identity)) -> HNonEmptyTable t (Col Identity)
108+toHNonEmptyTable = hvectorize vectorizer
109+{-# INLINABLE toHNonEmptyTable #-}
110+
111+
112+fromHNonEmptyTable :: HTable t => HNonEmptyTable t (Col Identity) -> NonEmpty (t (Col Identity))
113+fromHNonEmptyTable = hunvectorize unvectorizer
114+{-# INLINABLE fromHNonEmptyTable #-}
115+
116+
117+toHTheseTable :: (HTable t, HTable u)
118+ => These (t (Col Identity)) (u (Col Identity))
119+ -> HTheseTable t u (Col Identity)
120+toHTheseTable tables = HTheseTable
121+ { hhereTag = relabel hhereTag
122+ , hhere
123+ , hthereTag = relabel hthereTag
124+ , hthere
125+ }
126+ where
127+ HMaybeTable
128+ { htag = hhereTag
129+ , hjust = hhere
130+ } = toHMaybeTable (justHere tables)
131+ HMaybeTable
132+ { htag = hthereTag
133+ , hjust = hthere
134+ } = toHMaybeTable (justThere tables)
135+{-# INLINABLE toHTheseTable #-}
136+
137+
138+fromHTheseTable :: (HTable t, HTable u)
139+ => HTheseTable t u (Col Identity)
140+ -> These (t (Col Identity)) (u (Col Identity))
141+fromHTheseTable HTheseTable {hhereTag, hhere, hthereTag, hthere} =
142+ case (fromHMaybeTable mhere, fromHMaybeTable mthere) of
143+ (Just a, Nothing) -> This a
144+ (Nothing, Just b) -> That b
145+ (Just a, Just b) -> These a b
146+ _ -> error "fromHTheseTable: mismatch between tags and data"
147+ where
148+ mhere = HMaybeTable
149+ { htag = relabel hhereTag
150+ , hjust = hhere
151+ }
152+ mthere = HMaybeTable
153+ { htag = relabel hthereTag
154+ , hjust = hthere
155+ }
156+{-# INLINABLE fromHTheseTable #-}
157+
158+
159+null :: Col Identity ('Spec labels necessity (Maybe a))
160+null = Result Nothing
161+
162+
163+nullifier :: ()
164+ => SSpec ('Spec labels necessity a)
165+ -> Col Identity ('Spec labels necessity a)
166+ -> Col Identity ('Spec labels necessity (Nullify a))
167+nullifier SSpec {nullability} (Result a) = Result $ case nullability of
168+ Nullable -> a
169+ NonNullable -> Just a
170+
171+
172+unnullifier :: ()
173+ => SSpec ('Spec labels necessity a)
174+ -> Col Identity ('Spec labels necessity (Nullify a))
175+ -> Maybe (Col Identity ('Spec labels necessity a))
176+unnullifier SSpec {nullability} (Result a) =
177+ case nullability of
178+ Nullable -> pure $ Result a
179+ NonNullable -> Result <$> a
180+
181+
182+vectorizer :: Functor f
183+ => SSpec ('Spec labels necessity a)
184+ -> f (Col Identity ('Spec labels necessity a))
185+ -> Col Identity ('Spec labels necessity (f a))
186+vectorizer _ = Result . fmap (\(Result a) -> a)
187+
188+
189+unvectorizer :: Functor f
190+ => SSpec ('Spec labels necessity a)
191+ -> Col Identity ('Spec labels necessity (f a))
192+ -> f (Col Identity ('Spec labels necessity a))
193+unvectorizer _ (Result results) = Result <$> results
194+
195+
196+relabel :: ()
197+ => HIdentity ('Spec labels necessity a) (Col Identity)
198+ -> HIdentity ('Spec relabels necessity a) (Col Identity)
199+relabel (HIdentity (Result a)) = HIdentity (Result a)
src/Rel8/Schema/Context/Label.hsnew file+60
@@ -0,0 +1,60 @@
1+{-# language DataKinds #-}
2+{-# language FlexibleInstances #-}
3+{-# language StandaloneKindSignatures #-}
4+{-# language TypeFamilies #-}
5+{-# language TypeOperators #-}
6+
7+module Rel8.Schema.Context.Label
8+ ( Labelable( labeler, unlabeler )
9+ , HLabelable( hlabeler, hunlabeler )
10+ )
11+where
12+
13+-- base
14+import Data.Functor.Identity ( Identity )
15+import Data.Kind ( Constraint )
16+import Prelude hiding ( null )
17+
18+-- rel8
19+import Rel8.Schema.Context ( Interpretation, Col(..) )
20+import Rel8.Schema.Dict ( Dict( Dict ) )
21+import Rel8.Schema.Kind ( Context, HContext )
22+import Rel8.Schema.Spec ( Spec( Spec ) )
23+import Rel8.Schema.Spec.ConstrainDBType ( ConstrainDBType )
24+
25+
26+type Labelable :: Context -> Constraint
27+class Interpretation context => Labelable context where
28+ labeler :: ()
29+ => Col context ('Spec labels necessity a)
30+ -> Col context ('Spec (label ': labels) necessity a)
31+
32+ unlabeler :: ()
33+ => Col context ('Spec (label ': labels) necessity a)
34+ -> Col context ('Spec labels necessity a)
35+
36+
37+instance Labelable Identity where
38+ labeler (Result a) = Result a
39+ unlabeler (Result a) = Result a
40+
41+
42+type HLabelable :: HContext -> Constraint
43+class HLabelable context where
44+ hlabeler :: ()
45+ => context ('Spec labels necessity a)
46+ -> context ('Spec (label ': labels) necessity a)
47+
48+ hunlabeler :: ()
49+ => context ('Spec (label ': labels) necessity a)
50+ -> context ('Spec labels necessity a)
51+
52+
53+instance Labelable context => HLabelable (Col context) where
54+ hlabeler = labeler
55+ hunlabeler = unlabeler
56+
57+
58+instance HLabelable (Dict (ConstrainDBType constraint)) where
59+ hlabeler Dict = Dict
60+ hunlabeler Dict = Dict
src/Rel8/Schema/Context/Nullify.hs+166−105
@@ -1,144 +1,205 @@
1{-# language DataKinds #-}
1{-# language DataKinds #-}
2−{-# language EmptyCase #-}
3{-# language FlexibleContexts #-}
2{-# language FlexibleContexts #-}
4−{-# language GADTs #-}
3+{-# language FlexibleInstances #-}
4+{-# language InstanceSigs #-}
5{-# language LambdaCase #-}
5{-# language LambdaCase #-}
6+{-# language MultiParamTypeClasses #-}
6{-# language NamedFieldPuns #-}
7{-# language NamedFieldPuns #-}
8+{-# language ScopedTypeVariables #-}
7{-# language StandaloneKindSignatures #-}
9{-# language StandaloneKindSignatures #-}
10+{-# language TypeApplications #-}
11+{-# language TypeFamilies #-}
8
12
9module Rel8.Schema.Context.Nullify
13module Rel8.Schema.Context.Nullify
10− ( Nullifiability(..), NonNullifiability(..), nullifiableOrNot, absurd
11− , Nullifiable, nullifiability
12− , guarder, nullifier, unnullifier
14+ ( Nullifiable( ConstrainTag, encodeTag, decodeTag, nullifier, unnullifier )
13− , sguard, snullify
15+ , HNullifiable( HConstrainTag, hencodeTag, hdecodeTag, hnullifier, hunnullifier )
16+ , runTag, unnull
14 )
17 )
15where
18where
16
19
17-- base
20-- base
18−import Data.Bool ( bool )
19−import Data.Functor.Identity ( Identity( Identity ) )
20import Data.Kind ( Constraint, Type )
21import Data.Kind ( Constraint, Type )
22+import GHC.TypeLits ( KnownSymbol )
21import Prelude hiding ( null )
23import Prelude hiding ( null )
22
24
23-- opaleye
25-- opaleye
24import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
26import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
25
27
26-- rel8
28-- rel8
27−import Rel8.Aggregate ( Aggregate(..), zipOutputs )
29+import Rel8.Aggregate
30+ ( Aggregate, Col(..)
31+ , mapInputs
32+ , unsafeMakeAggregate
33+ )
28−import Rel8.Expr ( Expr )
34+import Rel8.Expr ( Expr, Col(..) )
29import Rel8.Expr.Bool ( boolExpr )
35import Rel8.Expr.Bool ( boolExpr )
30import Rel8.Expr.Null ( nullify, unsafeUnnullify )
36import Rel8.Expr.Null ( nullify, unsafeUnnullify )
31−import Rel8.Expr.Opaleye ( fromPrimExpr )
37+import Rel8.Expr.Opaleye ( fromPrimExpr, toPrimExpr )
32−import Rel8.Kind.Context ( SContext(..) )
38+import Rel8.Kind.Necessity ( Necessity( Required ) )
33−import Rel8.Schema.Field ( Field )
39+import Rel8.Schema.Context ( Interpretation )
34import qualified Rel8.Schema.Kind as K
40import qualified Rel8.Schema.Kind as K
35−import Rel8.Schema.Name ( Name( Name ) )
41+import Rel8.Schema.Name ( Name( Name ), Col(..) )
36−import Rel8.Schema.Null ( Nullify, Nullity( Null, NotNull ) )
42+import Rel8.Schema.Nullability
43+ ( Nullify
44+ , Nullability( Nullable, NonNullable )
45+ , Sql
46+ )
37−import Rel8.Schema.Result ( Result )
47+import Rel8.Schema.Dict ( Dict( Dict ) )
38−import Rel8.Schema.Spec ( Spec(..) )
48+import Rel8.Schema.Spec ( Spec( Spec ), SSpec(..) )
39−
49+import Rel8.Schema.Spec.ConstrainDBType
40−
50+ ( ConstrainDBType
41−type Nullifiability :: K.Context -> Type
51+ , dbTypeDict, dbTypeNullability, fromNullabilityDict
42−data Nullifiability context where
52+ )
43− NAggregate :: Nullifiability Aggregate
53+import Rel8.Table.Tag ( Tag(..), Taggable, fromAggregate, fromExpr, fromName )
44− NExpr :: Nullifiability Expr
45− NName :: Nullifiability Name
46
54
47
55
48type Nullifiable :: K.Context -> Constraint
56type Nullifiable :: K.Context -> Constraint
49−class Nullifiable context where
57+class Interpretation context => Nullifiable context where
50− nullifiability :: Nullifiability context
58+ type ConstrainTag context :: Type -> Constraint
59+ type ConstrainTag _context = DefaultConstrainTag
60+
61+ encodeTag ::
62+ ( Sql (ConstrainTag context) a
63+ , KnownSymbol label
64+ , Taggable a
65+ )
66+ => Tag label a
67+ -> Col context ('Spec labels 'Required a)
68+
69+ decodeTag ::
70+ ( Sql (ConstrainTag context) a
71+ , KnownSymbol label
72+ , Taggable a
73+ )
74+ => Col context ('Spec labels 'Required a)
75+ -> Tag label a
76+
77+ nullifier :: ()
78+ => Tag label a
79+ -> (Expr a -> Expr Bool)
80+ -> SSpec ('Spec labels necessity x)
81+ -> Col context ('Spec labels necessity x)
82+ -> Col context ('Spec labels necessity (Nullify x))
83+
84+ unnullifier :: ()
85+ => SSpec ('Spec labels necessity x)
86+ -> Col context ('Spec labels necessity (Nullify x))
87+ -> Col context ('Spec labels necessity x)
51
88
52
89
53instance Nullifiable Aggregate where
90instance Nullifiable Aggregate where
54− nullifiability = NAggregate
91+ encodeTag Tag {aggregator, expr} =
92+ Aggregation $ unsafeMakeAggregate toPrimExpr fromPrimExpr aggregator expr
93+
94+ decodeTag (Aggregation aggregate) = fromAggregate aggregate
95+
96+ nullifier Tag {expr} test SSpec {nullability} (Aggregation aggregate) =
97+ Aggregation $
98+ mapInputs (toPrimExpr . runTag nullability condition . fromPrimExpr) $
99+ runTag nullability condition <$> aggregate
100+ where
101+ condition = test expr
102+
103+ unnullifier SSpec {nullability} (Aggregation aggregate) =
104+ Aggregation $ unnull nullability <$> aggregate
105+
106+ {-# INLINABLE encodeTag #-}
107+ {-# INLINABLE decodeTag #-}
108+ {-# INLINABLE nullifier #-}
109+ {-# INLINABLE unnullifier #-}
55
110
56
111
57instance Nullifiable Expr where
112instance Nullifiable Expr where
58− nullifiability = NExpr
113+ encodeTag Tag {expr} = DB expr
114+ decodeTag (DB a) = fromExpr a
115+ nullifier Tag {expr} test SSpec {nullability} (DB a) =
116+ DB $ runTag nullability (test expr) a
117+ unnullifier SSpec {nullability} (DB a) = DB $ unnull nullability a
118+
119+ {-# INLINABLE encodeTag #-}
120+ {-# INLINABLE decodeTag #-}
121+ {-# INLINABLE nullifier #-}
122+ {-# INLINABLE unnullifier #-}
59
123
60
124
61instance Nullifiable Name where
125instance Nullifiable Name where
62− nullifiability = NName
126+ encodeTag Tag {name = Name name} = NameCol name
63−
127+ decodeTag (NameCol name) = fromName (Name name)
64−
128+ nullifier _ _ _ (NameCol name) = NameCol name
65−type NonNullifiability :: K.Context -> Type
129+ unnullifier _ (NameCol name) = NameCol name
66−data NonNullifiability context where
130+
67− NField :: NonNullifiability (Field table)
131+ {-# INLINABLE encodeTag #-}
68− NResult :: NonNullifiability Result
132+ {-# INLINABLE decodeTag #-}
69−
133+ {-# INLINABLE nullifier #-}
70−
134+ {-# INLINABLE unnullifier #-}
71−nullifiableOrNot :: ()
135+
72− => SContext context
136+
73− -> Either (NonNullifiability context) (Nullifiability context)
137+runTag :: Nullability a -> Expr Bool -> Expr a -> Expr (Nullify a)
74−nullifiableOrNot = \case
138+runTag nullability tag a = case nullability of
75− SAggregate -> Right NAggregate
139+ Nullable -> boolExpr null a tag
76− SExpr -> Right NExpr
140+ NonNullable -> boolExpr null (nullify a) tag
77− SField -> Left NField
78− SName -> Right NName
79− SResult -> Left NResult
80−
81−
82−absurd :: Nullifiability context -> NonNullifiability context -> a
83−absurd = \case
84− NAggregate -> \case
85− NExpr -> \case
86− NName -> \case
87−
88−
89−guarder :: ()
90− => SContext context
91− -> context tag
92− -> (tag -> Bool)
93− -> (Expr tag -> Expr Bool)
94− -> context (Maybe a)
95− -> context (Maybe a)
96−guarder = \case
97− SAggregate -> \tag _ isNonNull -> zipOutputs (sguard . isNonNull) tag
98− SExpr -> \tag _ isNonNull -> sguard (isNonNull tag)
99− SField -> \_ _ _ -> id
100− SName -> \_ _ _ -> id
101− SResult -> \(Identity tag) isNonNull _ (Identity a) ->
102− Identity (bool Nothing a (isNonNull tag))
103−
104−
105−nullifier :: ()
106− => Nullifiability context
107− -> Spec a
108− -> context a
109− -> context (Nullify a)
110−nullifier = \case
111− NAggregate -> \Spec {nullity} (Aggregate a) ->
112− Aggregate $ snullify nullity <$> a
113− NExpr -> \Spec {nullity} a -> snullify nullity a
114− NName -> \_ (Name a) -> Name a
115−
116−
117−unnullifier :: ()
118− => Nullifiability context
119− -> Spec a
120− -> context (Nullify a)
121− -> context a
122−unnullifier = \case
123− NAggregate -> \Spec {nullity} (Aggregate a) ->
124− Aggregate $ sunnullify nullity <$> a
125− NExpr -> \Spec {nullity} a -> sunnullify nullity a
126− NName -> \_ (Name a) -> Name a
127−
128−
129−sguard :: Expr Bool -> Expr (Maybe a) -> Expr (Maybe a)
130−sguard condition a = boolExpr null a condition
131 where
141 where
132 null = fromPrimExpr $ Opaleye.ConstExpr Opaleye.NullLit
142 null = fromPrimExpr $ Opaleye.ConstExpr Opaleye.NullLit
133
143
134
144
135−snullify :: Nullity a -> Expr a -> Expr (Nullify a)
145+unnull :: Nullability a -> Expr (Nullify a) -> Expr a
136−snullify nullity a = case nullity of
146+unnull nullability a = case nullability of
137− Null -> a
147+ Nullable -> a
138− NotNull -> nullify a
148+ NonNullable -> unsafeUnnullify a
149+
150+
151+type HNullifiable :: K.HContext -> Constraint
152+class HNullifiable context where
153+ type HConstrainTag context :: Type -> Constraint
154+ type HConstrainTag _context = DefaultConstrainTag
155+
156+ hencodeTag :: (Sql (HConstrainTag context) a, KnownSymbol label, Taggable a)
157+ => Tag label a
158+ -> context ('Spec labels 'Required a)
159+
160+ hdecodeTag :: (Sql (HConstrainTag context) a, KnownSymbol label, Taggable a)
161+ => context ('Spec labels 'Required a)
162+ -> Tag label a
163+
164+ hnullifier :: ()
165+ => Tag label a
166+ -> (Expr a -> Expr Bool)
167+ -> SSpec ('Spec labels necessity x)
168+ -> context ('Spec labels necessity x)
169+ -> context ('Spec labels necessity (Nullify x))
170+
171+ hunnullifier :: ()
172+ => SSpec ('Spec labels necessity x)
173+ -> context ('Spec labels necessity (Nullify x))
174+ -> context ('Spec labels necessity x)
175+
176+
177+instance Nullifiable context => HNullifiable (Col context) where
178+ type HConstrainTag (Col context) = ConstrainTag context
179+ hencodeTag = encodeTag
180+ hdecodeTag = decodeTag
181+ hnullifier = nullifier
182+ hunnullifier = unnullifier
183+
184+
185+instance HNullifiable (Dict (ConstrainDBType constraint)) where
186+ type HConstrainTag (Dict (ConstrainDBType constraint)) = constraint
187+
188+ hencodeTag _ = Dict
189+ hdecodeTag = mempty
190+
191+ hnullifier _ _ SSpec {} dict = case dbTypeDict dict of
192+ Dict -> case dbTypeNullability dict of
193+ Nullable -> Dict
194+ NonNullable -> Dict
195+
196+ hunnullifier SSpec {nullability} dict = case dbTypeDict dict of
197+ Dict -> case nullability of
198+ Nullable -> Dict
199+ NonNullable -> case dbTypeNullability dict of
200+ Nullable -> fromNullabilityDict nullability Dict
139
201
140
202
141−sunnullify :: Nullity a -> Expr (Nullify a) -> Expr a
203+type DefaultConstrainTag :: Type -> Constraint
142−sunnullify nullity a = case nullity of
204+class DefaultConstrainTag a
143− Null -> a
205+instance DefaultConstrainTag a
144− NotNull -> unsafeUnnullify a
src/Rel8/Schema/Field.hs+21−37
@@ -1,50 +1,34 @@
1{-# language DataKinds #-}
1{-# language DataKinds #-}
2−{-# language FlexibleContexts #-}
3−{-# language MultiParamTypeClasses #-}
4{-# language StandaloneKindSignatures #-}
2{-# language StandaloneKindSignatures #-}
5{-# language TypeFamilies #-}
3{-# language TypeFamilies #-}
6
4
7module Rel8.Schema.Field
5module Rel8.Schema.Field
8− ( Field(..)
6+ ( Field
9− , fields
10 )
7 )
11where
8where
12
9
13-- base
10-- base
14−import Data.Functor.Identity ( Identity( Identity ) )
11+import Data.Functor.Identity ( Identity )
15import Data.Kind ( Type )
12import Data.Kind ( Type )
16import Prelude
13import Prelude
17
14
18-- rel8
15-- rel8
19−import Rel8.Schema.HTable ( HField, htabulate )
16+import Rel8.Aggregate ( Aggregate )
20−import Rel8.Schema.HTable.Identity ( HIdentity( HIdentity ) )
17+import Rel8.Expr ( Expr )
18+import Rel8.Kind.Labels ( Labels )
19+import Rel8.Kind.Necessity ( Necessity( Required, Optional ) )
20+import Rel8.Schema.Insert ( Insert )
21−import Rel8.Schema.Kind as K
21+import qualified Rel8.Schema.Kind as K
22−import Rel8.Schema.Null ( Sql )
22+import Rel8.Schema.Spec ( Spec( Spec ) )
23−import Rel8.Table
23+import Rel8.Schema.Structure ( Structure, Shape( Column ), Shape1 )
24− ( Table, Columns, Context, fromColumns, toColumns
24+
25− , FromExprs, fromResult, toResult
25+
26− , Transpose
27− )
28−import Rel8.Table.Transpose ( Transposes )
29−import Rel8.Type ( DBType )
30−
31−
32−-- | A special context used in the construction of 'Rel8.Projection's.
33−type Field :: Type -> K.Context
26+type Field :: K.Context -> Labels -> Necessity -> Type -> Type
34−newtype Field table a = Field (HField (Columns table) a)
27+type family Field labels context necessity a where
35−
28+ Field Identity _labels _necessity a = a
36−
29+ Field Expr _labels _necessity a = Expr a
37−instance Sql DBType a => Table (Field table) (Field table a) where
30+ Field Insert _labels 'Required a = Expr a
38− type Columns (Field table a) = HIdentity a
31+ Field Insert _labels 'Optional a = Maybe (Expr a)
39− type Context (Field table a) = Field table
32+ Field Aggregate _labels _necessity a = Aggregate (Expr a)
40− type FromExprs (Field table a) = a
33+ Field Structure labels necessity a = Shape1 'Column ('Spec labels necessity a)
41− type Transpose to (Field table a) = to a
34+ Field context _labels _necessity a = context a
42−
43− toColumns = HIdentity
44− fromColumns (HIdentity a) = a
45− toResult a = HIdentity (Identity a)
46− fromResult (HIdentity (Identity a)) = a
47−
48−
49−fields :: Transposes context (Field table) table fields => fields
50−fields = fromColumns $ htabulate Field
src/Rel8/Schema/Generic.hsnew file+1049
@@ -0,0 +1,1049 @@
1+{-# language AllowAmbiguousTypes #-}
2+{-# language DataKinds #-}
3+{-# language DisambiguateRecordFields #-}
4+{-# language DefaultSignatures #-}
5+{-# language FlexibleContexts #-}
6+{-# language FlexibleInstances #-}
7+{-# language GADTs #-}
8+{-# language MultiParamTypeClasses #-}
9+{-# language ScopedTypeVariables #-}
10+{-# language StandaloneKindSignatures #-}
11+{-# language TypeApplications #-}
12+{-# language TypeFamilies #-}
13+{-# language TypeOperators #-}
14+{-# language UndecidableInstances #-}
15+{-# language ViewPatterns #-}
16+
17+{-# options_ghc -fno-warn-orphans #-}
18+
19+module Rel8.Schema.Generic
20+ ( Rel8able
21+ )
22+where
23+
24+-- base
25+import Data.Bifunctor ( bimap )
26+import Data.Functor.Identity ( Identity )
27+import Data.Kind ( Constraint, Type )
28+import Data.List.NonEmpty ( NonEmpty )
29+import GHC.Generics
30+ ( Generic, Rep, from, to
31+ , (:*:)( (:*:) ), K1( K1 ), M1( M1 )
32+ , D, C, S
33+ , Meta( MetaSel )
34+ )
35+import GHC.TypeLits ( Symbol, KnownSymbol )
36+import Prelude
37+
38+-- rel8
39+import Rel8.Aggregate ( Aggregate, Col(..) )
40+import Rel8.Expr ( Expr, Col(..) )
41+import Rel8.Kind.Necessity
42+ ( SNecessity( SRequired, SOptional )
43+ , KnownNecessity, necessitySing
44+ )
45+import Rel8.Schema.Context ( Col(..) )
46+import Rel8.Schema.Context.Identity
47+ ( fromHEitherTable, toHEitherTable
48+ , fromHListTable, toHListTable
49+ , fromHMaybeTable, toHMaybeTable
50+ , fromHNonEmptyTable, toHNonEmptyTable
51+ , fromHTheseTable, toHTheseTable
52+ )
53+import Rel8.Schema.Context.Label
54+ ( Labelable, labeler, unlabeler
55+ , hlabeler, hunlabeler
56+ )
57+import Rel8.Schema.Field ( Field )
58+import Rel8.Schema.HTable ( HTable )
59+import Rel8.Schema.HTable.Either ( HEitherTable )
60+import Rel8.Schema.HTable.Identity ( HIdentity(..) )
61+import Rel8.Schema.HTable.Label ( HLabel, hlabel, hunlabel )
62+import Rel8.Schema.HTable.List ( HListTable )
63+import Rel8.Schema.HTable.Maybe ( HMaybeTable )
64+import Rel8.Schema.HTable.NonEmpty ( HNonEmptyTable )
65+import Rel8.Schema.HTable.Pair ( HPair(..) )
66+import Rel8.Schema.HTable.Quartet ( HQuartet(..) )
67+import Rel8.Schema.HTable.Quintet ( HQuintet(..) )
68+import Rel8.Schema.HTable.These ( HTheseTable )
69+import Rel8.Schema.HTable.Trio ( HTrio(..) )
70+import Rel8.Schema.HTable.Vectorize ( hrelabel )
71+import Rel8.Schema.Insert ( Insert, Col(..) )
72+import qualified Rel8.Schema.Kind as K
73+import Rel8.Schema.Name ( Name( Name ), Col(..) )
74+import Rel8.Schema.Spec ( Spec( Spec ), KTable )
75+import Rel8.Schema.Structure
76+ ( IsStructure, Shape(..), Shape1, Shape2
77+ , Structure
78+ )
79+import Rel8.Table
80+ ( Table, Columns, Context, fromColumns, toColumns
81+ )
82+import Rel8.Table.Either ( EitherTable )
83+import Rel8.Table.Lifted
84+ ( fromColumns1, toColumns1
85+ , fromColumns2, toColumns2
86+ )
87+import Rel8.Table.List ( ListTable )
88+import Rel8.Table.Maybe ( MaybeTable(..) )
89+import Rel8.Table.NonEmpty ( NonEmptyTable )
90+import Rel8.Table.These ( TheseTable )
91+
92+-- these
93+import Data.These ( These )
94+
95+
96+instance (Rel8able t, TableHelper context) => Table context (t context) where
97+ type Columns (t context) = GRep t
98+ type Context (t context) = context
99+ fromColumns = gfromColumns
100+ toColumns = gtoColumns
101+
102+
103+type TableHelper :: K.Context -> Constraint
104+class TableHelper context where
105+ gfromColumns :: Rel8able t => GRep t (Col context) -> t context
106+ gtoColumns :: Rel8able t => t context -> GRep t (Col context)
107+
108+
109+instance TableHelper Aggregate where
110+ gfromColumns = fromAggregateColumns
111+ gtoColumns = toAggregateColumns
112+
113+
114+instance TableHelper Expr where
115+ gfromColumns = fromExprColumns
116+ gtoColumns = toExprColumns
117+
118+
119+instance TableHelper Insert where
120+ gfromColumns = fromInsertColumns
121+ gtoColumns = toInsertColumns
122+
123+
124+instance TableHelper Identity where
125+ gfromColumns = fromIdentityColumns
126+ gtoColumns = toIdentityColumns
127+
128+
129+instance TableHelper Name where
130+ gfromColumns = fromNameColumns
131+ gtoColumns = toNameColumns
132+
133+
134+-- | This type class allows you to define custom 'Table's using higher-kinded
135+-- data types. Higher-kinded data types are data types of the pattern:
136+--
137+-- @
138+-- data MyType f =
139+-- MyType { field1 :: Column f T1 OR HK1 f
140+-- , field2 :: Column f T2 OR HK2 f
141+-- , ...
142+-- , fieldN :: Column f Tn OR HKn f
143+-- }
144+-- @
145+--
146+-- where @Tn@ is any Haskell type, and @HKn@ is any higher-kinded type.
147+--
148+-- That is, higher-kinded data are records where all fields in the record are
149+-- all either of the type @Column f T@ (for any @T@), or are themselves
150+-- higher-kinded data:
151+--
152+-- [Nested]
153+--
154+-- @
155+-- data Nested f =
156+-- Nested { nested1 :: MyType f
157+-- , nested2 :: MyType f
158+-- }
159+-- @
160+--
161+-- The @Rel8able@ type class is used to give us a special mapping operation
162+-- that lets us change the type parameter @f@.
163+--
164+-- [Supplying @Rel8able@ instances]
165+--
166+-- This type class should be derived generically for all table types in your
167+-- project. To do this, enable the @DeriveAnyType@ and @DeriveGeneric@ language
168+-- extensions:
169+--
170+-- @
171+-- \{\-\# LANGUAGE DeriveAnyClass, DeriveGeneric #-\}
172+--
173+-- data MyType f = MyType { fieldA :: Column f T }
174+-- deriving ( GHC.Generics.Generic, Rel8able )
175+-- @
176+type Rel8able :: KTable -> Constraint
177+class HTable (GRep t) => Rel8able t where
178+ type GRep t :: K.HTable
179+
180+ fromAggregateColumns :: GRep t (Col Aggregate) -> t Aggregate
181+ toAggregateColumns :: t Aggregate -> GRep t (Col Aggregate)
182+
183+ fromExprColumns :: GRep t (Col Expr) -> t Expr
184+ toExprColumns :: t Expr -> GRep t (Col Expr)
185+
186+ fromInsertColumns :: GRep t (Col Insert) -> t Insert
187+ toInsertColumns :: t Insert -> GRep t (Col Insert)
188+
189+ fromIdentityColumns :: GRep t (Col Identity) -> t Identity
190+ toIdentityColumns :: t Identity -> GRep t (Col Identity)
191+
192+ fromNameColumns :: GRep t (Col Name) -> t Name
193+ toNameColumns :: t Name -> GRep t (Col Name)
194+
195+ type GRep t = GColumns (Rep (t Structure))
196+
197+ default fromAggregateColumns ::
198+ ( Generic (t Aggregate)
199+ , GColumns (Rep (t Structure)) ~ GRep t
200+ , GRel8able Aggregate (Rep (t Structure)) (Rep (t Aggregate))
201+ ) => GRep t (Col Aggregate) -> t Aggregate
202+ fromAggregateColumns = to . fromGColumns @_ @(Rep (t Structure))
203+
204+ default toAggregateColumns ::
205+ ( Generic (t Aggregate)
206+ , GColumns (Rep (t Structure)) ~ GRep t
207+ , GRel8able Aggregate (Rep (t Structure)) (Rep (t Aggregate))
208+ ) => t Aggregate -> GRep t (Col Aggregate)
209+ toAggregateColumns = toGColumns @_ @(Rep (t Structure)) . from
210+
211+ default fromExprColumns ::
212+ ( Generic (t Expr)
213+ , GColumns (Rep (t Structure)) ~ GRep t
214+ , GRel8able Expr (Rep (t Structure)) (Rep (t Expr))
215+ ) => GRep t (Col Expr) -> t Expr
216+ fromExprColumns = to . fromGColumns @_ @(Rep (t Structure))
217+
218+ default toExprColumns ::
219+ ( Generic (t Expr)
220+ , GColumns (Rep (t Structure)) ~ GRep t
221+ , GRel8able Expr (Rep (t Structure)) (Rep (t Expr))
222+ ) => t Expr -> GRep t (Col Expr)
223+ toExprColumns = toGColumns @_ @(Rep (t Structure)) . from
224+
225+ default fromInsertColumns ::
226+ ( Generic (t Insert)
227+ , GColumns (Rep (t Structure)) ~ GRep t
228+ , GRel8able Insert (Rep (t Structure)) (Rep (t Insert))
229+ ) => GRep t (Col Insert) -> t Insert
230+ fromInsertColumns = to . fromGColumns @_ @(Rep (t Structure))
231+
232+ default toInsertColumns ::
233+ ( Generic (t Insert)
234+ , GColumns (Rep (t Structure)) ~ GRep t
235+ , GRel8able Insert (Rep (t Structure)) (Rep (t Insert))
236+ ) => t Insert -> GRep t (Col Insert)
237+ toInsertColumns = toGColumns @_ @(Rep (t Structure)) . from
238+
239+ default fromIdentityColumns ::
240+ ( Generic (t Identity)
241+ , GColumns (Rep (t Structure)) ~ GRep t
242+ , GRel8able Identity (Rep (t Structure)) (Rep (t Identity))
243+ ) => GRep t (Col Identity) -> t Identity
244+ fromIdentityColumns = to . fromGColumns @_ @(Rep (t Structure))
245+
246+ default toIdentityColumns ::
247+ ( Generic (t Identity)
248+ , GColumns (Rep (t Structure)) ~ GRep t
249+ , GRel8able Identity (Rep (t Structure)) (Rep (t Identity))
250+ ) => t Identity -> GRep t (Col Identity)
251+ toIdentityColumns = toGColumns @_ @(Rep (t Structure)) . from
252+
253+ default fromNameColumns ::
254+ ( Generic (t Name)
255+ , GColumns (Rep (t Structure)) ~ GRep t
256+ , GRel8able Name (Rep (t Structure)) (Rep (t Name))
257+ ) => GRep t (Col Name) -> t Name
258+ fromNameColumns = to . fromGColumns @_ @(Rep (t Structure))
259+
260+ default toNameColumns ::
261+ ( Generic (t Name)
262+ , GColumns (Rep (t Structure)) ~ GRep t
263+ , GRel8able Name (Rep (t Structure)) (Rep (t Name))
264+ ) => t Name -> GRep t (Col Name)
265+ toNameColumns = toGColumns @_ @(Rep (t Structure)) . from
266+
267+
268+type GColumns :: (Type -> Type) -> K.HTable
269+type family GColumns structure where
270+ GColumns (M1 D _ structure) = GColumns structure
271+ GColumns (M1 C _ structure) = GColumns structure
272+ GColumns (a :*: b) = HPair (GColumns a) (GColumns b)
273+ GColumns (M1 S ('MetaSel ('Just label) _ _ _) (K1 _ structure)) =
274+ K1Columns label structure
275+
276+
277+type GRel8able :: K.Context -> (Type -> Type) -> (Type -> Type) -> Constraint
278+class GRel8able context structure rep where
279+ fromGColumns :: GColumns structure (Col context) -> rep x
280+ toGColumns :: rep x -> GColumns structure (Col context)
281+
282+
283+instance GRel8able context structure rep => GRel8able context (M1 D c structure) (M1 D c rep) where
284+ fromGColumns = M1 . fromGColumns @context @structure @rep
285+ toGColumns (M1 a) = toGColumns @context @structure @rep a
286+
287+
288+instance GRel8able context structure rep => GRel8able context (M1 C c structure) (M1 C c rep) where
289+ fromGColumns = M1 . fromGColumns @context @structure @rep
290+ toGColumns (M1 a) = toGColumns @context @structure @rep a
291+
292+
293+instance (GRel8able context structure1 rep1, GRel8able context structure2 rep2) =>
294+ GRel8able context (structure1 :*: structure2) (rep1 :*: rep2)
295+ where
296+ fromGColumns (HPair a b) =
297+ fromGColumns @context @structure1 @rep1 a :*:
298+ fromGColumns @context @structure2 @rep2 b
299+ toGColumns (a :*: b) =
300+ HPair
301+ (toGColumns @context @structure1 @rep1 a)
302+ (toGColumns @context @structure2 @rep2 b)
303+
304+
305+instance
306+ ( K1Table label context isStructure structure a
307+ , meta ~ 'MetaSel ('Just label) _su _ss _ds
308+ , structureK1 ~ K1 i structure
309+ , k1 ~ K1 i a
310+ ) => GRel8able context (M1 S meta structureK1) (M1 S meta k1)
311+ where
312+ fromGColumns = M1 . K1 . fromK1Columns @label @_ @_ @structure
313+ toGColumns (M1 (K1 a)) = toK1Columns @label @_ @_ @structure a
314+
315+
316+type K1Columns :: Symbol -> Type -> K.HTable
317+type family K1Columns label structure where
318+ K1Columns label (Shape1 'Column ('Spec '[] necessity a)) =
319+ HIdentity ('Spec '[label] necessity a)
320+ K1Columns _label (Shape1 'Column ('Spec (label ': labels) necessity a)) =
321+ HIdentity ('Spec (label ': labels) necessity a)
322+ K1Columns label (Shape2 'Either a b) =
323+ HLabel label (HEitherTable (K1Columns "Left" a) (K1Columns "Right" b))
324+ K1Columns label (Shape1 'List a) = HListTable (K1Columns label a)
325+ K1Columns label (Shape1 'Maybe a) = HLabel label (HMaybeTable (K1Columns "Just" a))
326+ K1Columns label (Shape1 'NonEmpty a) = HNonEmptyTable (K1Columns label a)
327+ K1Columns label (Shape2 'These a b) =
328+ HLabel label (HTheseTable (K1Columns "Here" a) (K1Columns "There" b))
329+ K1Columns label (a, b) =
330+ HLabel label
331+ (HPair
332+ (K1Columns "fst" a)
333+ (K1Columns "snd" b))
334+ K1Columns label (a, b, c) =
335+ HLabel label
336+ (HTrio
337+ (K1Columns "fst" a)
338+ (K1Columns "snd" b)
339+ (K1Columns "trd" c))
340+ K1Columns label (a, b, c, d) =
341+ HLabel label
342+ (HQuartet
343+ (K1Columns "fst" a)
344+ (K1Columns "snd" b)
345+ (K1Columns "trd" c)
346+ (K1Columns "frt" d))
347+ K1Columns label (a, b, c, d, e) =
348+ HLabel label
349+ (HQuintet
350+ (K1Columns "fst" a)
351+ (K1Columns "snd" b)
352+ (K1Columns "trd" c)
353+ (K1Columns "frt" d)
354+ (K1Columns "fft" e))
355+ K1Columns label a = HLabel label (Columns a)
356+
357+
358+type K1Table :: Symbol -> K.Context -> Bool -> Type -> Type -> Constraint
359+class isStructure ~ IsStructure structure =>
360+ K1Table label context isStructure structure a
361+ where
362+ fromK1Columns :: K1Columns label structure (Col context) -> a
363+ toK1Columns :: a -> K1Columns label structure (Col context)
364+
365+
366+instance
367+ ( x ~ Field Aggregate '[] necessity a
368+ ) => K1Table label Aggregate 'True (Shape1 'Column ('Spec '[] necessity a)) x
369+ where
370+ fromK1Columns (HIdentity (Aggregation a)) = a
371+ toK1Columns = HIdentity . Aggregation
372+ {-# INLINABLE fromK1Columns #-}
373+ {-# INLINABLE toK1Columns #-}
374+
375+
376+instance
377+ ( x ~ Field Aggregate (label ': labels) necessity a
378+ ) => K1Table _label Aggregate 'True (Shape1 'Column ('Spec (label ': labels) necessity a)) x
379+ where
380+ fromK1Columns (HIdentity (Aggregation a)) = a
381+ toK1Columns = HIdentity . Aggregation
382+ {-# INLINABLE fromK1Columns #-}
383+ {-# INLINABLE toK1Columns #-}
384+
385+
386+instance
387+ ( x ~ Field Expr '[] necessity a
388+ ) => K1Table label Expr 'True (Shape1 'Column ('Spec '[] necessity a)) x
389+ where
390+ fromK1Columns (HIdentity (DB a)) = a
391+ toK1Columns = HIdentity . DB
392+ {-# INLINABLE fromK1Columns #-}
393+ {-# INLINABLE toK1Columns #-}
394+
395+
396+instance
397+ ( x ~ Field Expr (label ': labels) necessity a
398+ ) => K1Table _label Expr 'True (Shape1 'Column ('Spec (label ': labels) necessity a)) x
399+ where
400+ fromK1Columns (HIdentity (DB a)) = a
401+ toK1Columns = HIdentity . DB
402+ {-# INLINABLE fromK1Columns #-}
403+ {-# INLINABLE toK1Columns #-}
404+
405+
406+instance
407+ ( x ~ Field Insert '[] necessity a
408+ , KnownNecessity necessity
409+ ) => K1Table label Insert 'True (Shape1 'Column ('Spec '[] necessity a)) x
410+ where
411+ fromK1Columns (HIdentity insert) = case insert of
412+ RequiredInsert a -> a
413+ OptionalInsert ma -> ma
414+ toK1Columns a = HIdentity $ case necessitySing @necessity of
415+ SRequired -> RequiredInsert a
416+ SOptional -> OptionalInsert a
417+ {-# INLINABLE fromK1Columns #-}
418+ {-# INLINABLE toK1Columns #-}
419+
420+
421+instance
422+ ( x ~ Field Insert (label ': labels) necessity a
423+ , KnownNecessity necessity
424+ ) => K1Table _label Insert 'True (Shape1 'Column ('Spec (label ': labels) necessity a)) x
425+ where
426+ fromK1Columns (HIdentity insert) = case insert of
427+ RequiredInsert a -> a
428+ OptionalInsert ma -> ma
429+ toK1Columns a = HIdentity $ case necessitySing @necessity of
430+ SRequired -> RequiredInsert a
431+ SOptional -> OptionalInsert a
432+ {-# INLINABLE fromK1Columns #-}
433+ {-# INLINABLE toK1Columns #-}
434+
435+
436+instance
437+ ( x ~ Field Identity '[] necessity a
438+ ) => K1Table label Identity 'True (Shape1 'Column ('Spec '[] necessity a)) x
439+ where
440+ fromK1Columns (HIdentity (Result a)) = a
441+ toK1Columns = HIdentity . Result
442+ {-# INLINABLE fromK1Columns #-}
443+ {-# INLINABLE toK1Columns #-}
444+
445+
446+instance
447+ ( x ~ Field Identity (label ': labels) necessity a
448+ ) => K1Table _label Identity 'True (Shape1 'Column ('Spec (label ': labels) necessity a)) x
449+ where
450+ fromK1Columns (HIdentity (Result a)) = a
451+ toK1Columns = HIdentity . Result
452+ {-# INLINABLE fromK1Columns #-}
453+ {-# INLINABLE toK1Columns #-}
454+
455+
456+instance
457+ ( x ~ Field Name '[] necessity a
458+ ) => K1Table _label Name 'True (Shape1 'Column ('Spec (label ': labels) necessity a)) x
459+ where
460+ fromK1Columns (HIdentity (NameCol a)) = Name a
461+ toK1Columns (Name a) = HIdentity (NameCol a)
462+ {-# INLINABLE fromK1Columns #-}
463+ {-# INLINABLE toK1Columns #-}
464+
465+
466+instance
467+ ( x ~ Field Name (label ': labels) necessity a
468+ ) => K1Table label Name 'True (Shape1 'Column ('Spec '[] necessity a)) x
469+ where
470+ fromK1Columns = Name . (\(NameCol a) -> a) . unlabeler . unHIdentity
471+ toK1Columns = HIdentity . labeler . NameCol . (\(Name a) -> a)
472+ {-# INLINABLE fromK1Columns #-}
473+ {-# INLINABLE toK1Columns #-}
474+
475+
476+instance
477+ ( HTable (K1Columns "Left" structure1)
478+ , HTable (K1Columns "Right" structure2)
479+ , K1Table "Left" Aggregate (IsStructure structure1) structure1 a
480+ , K1Table "Right" Aggregate (IsStructure structure2) structure2 b
481+ , e ~ EitherTable a b
482+ , KnownSymbol label
483+ ) => K1Table label Aggregate 'True (Shape2 'Either structure1 structure2) e
484+ where
485+ fromK1Columns =
486+ fromColumns2
487+ (fromK1Columns @"Left" @_ @_ @structure1)
488+ (fromK1Columns @"Right" @_ @_ @structure2) .
489+ hunlabel unlabeler
490+ toK1Columns =
491+ hlabel labeler .
492+ toColumns2
493+ (toK1Columns @"Left" @_ @_ @structure1)
494+ (toK1Columns @"Right" @_ @_ @structure2)
495+ {-# INLINABLE fromK1Columns #-}
496+ {-# INLINABLE toK1Columns #-}
497+
498+
499+instance
500+ ( HTable (K1Columns "Left" structure1)
501+ , HTable (K1Columns "Right" structure2)
502+ , K1Table "Left" Expr (IsStructure structure1) structure1 a
503+ , K1Table "Right" Expr (IsStructure structure2) structure2 b
504+ , e ~ EitherTable a b
505+ , KnownSymbol label
506+ ) => K1Table label Expr 'True (Shape2 'Either structure1 structure2) e
507+ where
508+ fromK1Columns =
509+ fromColumns2
510+ (fromK1Columns @"Left" @_ @_ @structure1)
511+ (fromK1Columns @"Right" @_ @_ @structure2) .
512+ hunlabel unlabeler
513+ toK1Columns =
514+ hlabel labeler .
515+ toColumns2
516+ (toK1Columns @"Left" @_ @_ @structure1)
517+ (toK1Columns @"Right" @_ @_ @structure2)
518+ {-# INLINABLE fromK1Columns #-}
519+ {-# INLINABLE toK1Columns #-}
520+
521+
522+instance
523+ ( HTable (K1Columns "Left" structure1)
524+ , HTable (K1Columns "Right" structure2)
525+ , K1Table "Left" Insert (IsStructure structure1) structure1 a
526+ , K1Table "Right" Insert (IsStructure structure2) structure2 b
527+ , e ~ EitherTable a b
528+ , KnownSymbol label
529+ ) => K1Table label Insert 'True (Shape2 'Either structure1 structure2) e
530+ where
531+ fromK1Columns =
532+ fromColumns2
533+ (fromK1Columns @"Left" @_ @_ @structure1)
534+ (fromK1Columns @"Right" @_ @_ @structure2) .
535+ hunlabel unlabeler
536+ toK1Columns =
537+ hlabel labeler .
538+ toColumns2
539+ (toK1Columns @"Left" @_ @_ @structure1)
540+ (toK1Columns @"Right" @_ @_ @structure2)
541+ {-# INLINABLE fromK1Columns #-}
542+ {-# INLINABLE toK1Columns #-}
543+
544+
545+instance
546+ ( HTable (K1Columns "Left" structure1)
547+ , HTable (K1Columns "Right" structure2)
548+ , K1Table "Left" Identity (IsStructure structure1) structure1 a
549+ , K1Table "Right" Identity (IsStructure structure2) structure2 b
550+ , e ~ Either a b
551+ , KnownSymbol label
552+ ) => K1Table label Identity 'True (Shape2 'Either structure1 structure2) e
553+ where
554+ fromK1Columns
555+ = bimap
556+ (fromK1Columns @"Left" @_ @_ @structure1)
557+ (fromK1Columns @"Right" @_ @_ @structure2)
558+ . fromHEitherTable
559+ . hunlabel unlabeler
560+ toK1Columns
561+ = hlabel labeler
562+ . toHEitherTable
563+ . bimap
564+ (toK1Columns @"Left" @_ @_ @structure1)
565+ (toK1Columns @"Right" @_ @_ @structure2)
566+ {-# INLINABLE fromK1Columns #-}
567+ {-# INLINABLE toK1Columns #-}
568+
569+
570+instance
571+ ( HTable (K1Columns "Left" structure1)
572+ , HTable (K1Columns "Right" structure2)
573+ , K1Table "Left" Name (IsStructure structure1) structure1 a
574+ , K1Table "Right" Name (IsStructure structure2) structure2 b
575+ , e ~ EitherTable a b
576+ , KnownSymbol label
577+ ) => K1Table label Name 'True (Shape2 'Either structure1 structure2) e
578+ where
579+ fromK1Columns =
580+ fromColumns2
581+ (fromK1Columns @"Left" @_ @_ @structure1)
582+ (fromK1Columns @"Right" @_ @_ @structure2) .
583+ hunlabel unlabeler
584+ toK1Columns =
585+ hlabel labeler .
586+ toColumns2
587+ (toK1Columns @"Left" @_ @_ @structure1)
588+ (toK1Columns @"Right" @_ @_ @structure2)
589+ {-# INLINABLE fromK1Columns #-}
590+ {-# INLINABLE toK1Columns #-}
591+
592+
593+instance
594+ ( Table Aggregate a
595+ , K1Columns label structure ~ HLabel label (Columns a)
596+ , as ~ ListTable a
597+ , KnownSymbol label
598+ ) => K1Table label Aggregate 'True (Shape1 'List structure) as
599+ where
600+ fromK1Columns = fromColumns . hrelabel (hunlabel hunlabeler)
601+ toK1Columns = hrelabel (hlabel hlabeler) . toColumns
602+ {-# INLINABLE fromK1Columns #-}
603+ {-# INLINABLE toK1Columns #-}
604+
605+
606+instance
607+ ( Table Expr a
608+ , K1Columns label structure ~ HLabel label (Columns a)
609+ , as ~ ListTable a
610+ , KnownSymbol label
611+ ) => K1Table label Expr 'True (Shape1 'List structure) as
612+ where
613+ fromK1Columns = fromColumns . hrelabel (hunlabel hunlabeler)
614+ toK1Columns = hrelabel (hlabel hlabeler) . toColumns
615+ {-# INLINABLE fromK1Columns #-}
616+ {-# INLINABLE toK1Columns #-}
617+
618+
619+instance
620+ ( Table Insert a
621+ , K1Columns label structure ~ HLabel label (Columns a)
622+ , as ~ ListTable a
623+ , KnownSymbol label
624+ ) => K1Table label Insert 'True (Shape1 'List structure) as
625+ where
626+ fromK1Columns = fromColumns . hrelabel (hunlabel hunlabeler)
627+ toK1Columns = hrelabel (hlabel hlabeler) . toColumns
628+ {-# INLINABLE fromK1Columns #-}
629+ {-# INLINABLE toK1Columns #-}
630+
631+
632+instance
633+ ( K1Table label Identity (IsStructure structure) structure a
634+ , HTable (K1Columns label structure)
635+ , as ~ [a]
636+ ) => K1Table label Identity 'True (Shape1 'List structure) as
637+ where
638+ fromK1Columns = fmap (fromK1Columns @label @_ @_ @structure) . fromHListTable
639+ toK1Columns = toHListTable . fmap (toK1Columns @label @_ @_ @structure)
640+ {-# INLINABLE fromK1Columns #-}
641+ {-# INLINABLE toK1Columns #-}
642+
643+
644+instance
645+ ( Table Name a
646+ , K1Columns label structure ~ HLabel label (Columns a)
647+ , as ~ ListTable a
648+ , KnownSymbol label
649+ ) => K1Table label Name 'True (Shape1 'List structure) as
650+ where
651+ fromK1Columns = fromColumns . hrelabel (hunlabel hunlabeler)
652+ toK1Columns = hrelabel (hlabel hlabeler) . toColumns
653+ {-# INLINABLE fromK1Columns #-}
654+ {-# INLINABLE toK1Columns #-}
655+
656+
657+instance
658+ ( HTable (K1Columns "Just" structure)
659+ , K1Table "Just" Aggregate (IsStructure structure) structure a
660+ , ma ~ MaybeTable a
661+ , KnownSymbol label
662+ ) => K1Table label Aggregate 'True (Shape1 'Maybe structure) ma
663+ where
664+ fromK1Columns =
665+ fromColumns1 (fromK1Columns @"Just" @_ @_ @structure) .
666+ hunlabel unlabeler
667+ toK1Columns =
668+ hlabel labeler .
669+ toColumns1 (toK1Columns @"Just" @_ @_ @structure)
670+ {-# INLINABLE fromK1Columns #-}
671+ {-# INLINABLE toK1Columns #-}
672+
673+
674+instance
675+ ( HTable (K1Columns "Just" structure)
676+ , K1Table "Just" Expr (IsStructure structure) structure a
677+ , ma ~ MaybeTable a
678+ , KnownSymbol label
679+ ) => K1Table label Expr 'True (Shape1 'Maybe structure) ma
680+ where
681+ fromK1Columns =
682+ fromColumns1 (fromK1Columns @"Just" @_ @_ @structure) .
683+ hunlabel unlabeler
684+ toK1Columns =
685+ hlabel labeler .
686+ toColumns1 (toK1Columns @"Just" @_ @_ @structure)
687+ {-# INLINABLE fromK1Columns #-}
688+ {-# INLINABLE toK1Columns #-}
689+
690+
691+instance
692+ ( HTable (K1Columns "Just" structure)
693+ , K1Table "Just" Insert (IsStructure structure) structure a
694+ , ma ~ MaybeTable a
695+ , KnownSymbol label
696+ ) => K1Table label Insert 'True (Shape1 'Maybe structure) ma
697+ where
698+ fromK1Columns =
699+ fromColumns1 (fromK1Columns @"Just" @_ @_ @structure) .
700+ hunlabel unlabeler
701+ toK1Columns =
702+ hlabel labeler .
703+ toColumns1 (toK1Columns @"Just" @_ @_ @structure)
704+ {-# INLINABLE fromK1Columns #-}
705+ {-# INLINABLE toK1Columns #-}
706+
707+
708+instance
709+ ( HTable (K1Columns "Just" structure)
710+ , K1Table "Just" Identity (IsStructure structure) structure a
711+ , ma ~ Maybe a
712+ , KnownSymbol label
713+ ) => K1Table label Identity 'True (Shape1 'Maybe structure) ma
714+ where
715+ fromK1Columns
716+ = fmap (fromK1Columns @"Just" @_ @_ @structure)
717+ . fromHMaybeTable
718+ . hunlabel unlabeler
719+ toK1Columns
720+ = hlabel labeler
721+ . toHMaybeTable
722+ . fmap (toK1Columns @"Just" @_ @_ @structure)
723+ {-# INLINABLE fromK1Columns #-}
724+ {-# INLINABLE toK1Columns #-}
725+
726+
727+instance
728+ ( HTable (K1Columns "Just" structure)
729+ , K1Table "Just" Name (IsStructure structure) structure a
730+ , ma ~ MaybeTable a
731+ , KnownSymbol label
732+ ) => K1Table label Name 'True (Shape1 'Maybe structure) ma
733+ where
734+ fromK1Columns =
735+ fromColumns1 (fromK1Columns @"Just" @_ @_ @structure) .
736+ hunlabel unlabeler
737+ toK1Columns =
738+ hlabel labeler .
739+ toColumns1 (toK1Columns @"Just" @_ @_ @structure)
740+ {-# INLINABLE fromK1Columns #-}
741+ {-# INLINABLE toK1Columns #-}
742+
743+
744+instance
745+ ( Table Aggregate a
746+ , K1Columns label structure ~ HLabel label (Columns a)
747+ , as ~ NonEmptyTable a
748+ , KnownSymbol label
749+ ) => K1Table label Aggregate 'True (Shape1 'NonEmpty structure) as
750+ where
751+ fromK1Columns = fromColumns . hrelabel (hunlabel hunlabeler)
752+ toK1Columns = hrelabel (hlabel hlabeler) . toColumns
753+ {-# INLINABLE fromK1Columns #-}
754+ {-# INLINABLE toK1Columns #-}
755+
756+
757+instance
758+ ( Table Expr a
759+ , K1Columns label structure ~ HLabel label (Columns a)
760+ , as ~ NonEmptyTable a
761+ , KnownSymbol label
762+ ) => K1Table label Expr 'True (Shape1 'NonEmpty structure) as
763+ where
764+ fromK1Columns = fromColumns . hrelabel (hunlabel hunlabeler)
765+ toK1Columns = hrelabel (hlabel hlabeler) . toColumns
766+ {-# INLINABLE fromK1Columns #-}
767+ {-# INLINABLE toK1Columns #-}
768+
769+
770+instance
771+ ( Table Insert a
772+ , K1Columns label structure ~ HLabel label (Columns a)
773+ , as ~ NonEmptyTable a
774+ , KnownSymbol label
775+ ) => K1Table label Insert 'True (Shape1 'NonEmpty structure) as
776+ where
777+ fromK1Columns = fromColumns . hrelabel (hunlabel hunlabeler)
778+ toK1Columns = hrelabel (hlabel hlabeler) . toColumns
779+ {-# INLINABLE fromK1Columns #-}
780+ {-# INLINABLE toK1Columns #-}
781+
782+
783+instance
784+ ( K1Table label Identity (IsStructure structure) structure a
785+ , HTable (K1Columns label structure)
786+ , as ~ NonEmpty a
787+ ) => K1Table label Identity 'True (Shape1 'NonEmpty structure) as
788+ where
789+ fromK1Columns = fmap (fromK1Columns @label @_ @_ @structure) . fromHNonEmptyTable
790+ toK1Columns = toHNonEmptyTable . fmap (toK1Columns @label @_ @_ @structure)
791+ {-# INLINABLE fromK1Columns #-}
792+ {-# INLINABLE toK1Columns #-}
793+
794+
795+instance
796+ ( Table Name a
797+ , K1Columns label structure ~ HLabel label (Columns a)
798+ , as ~ NonEmptyTable a
799+ , KnownSymbol label
800+ ) => K1Table label Name 'True (Shape1 'NonEmpty structure) as
801+ where
802+ fromK1Columns = fromColumns . hrelabel (hunlabel hunlabeler)
803+ toK1Columns = hrelabel (hlabel hlabeler) . toColumns
804+ {-# INLINABLE fromK1Columns #-}
805+ {-# INLINABLE toK1Columns #-}
806+
807+
808+instance
809+ ( HTable (K1Columns "Here" structure1)
810+ , HTable (K1Columns "There" structure2)
811+ , K1Table "Here" Aggregate (IsStructure structure1) structure1 a
812+ , K1Table "There" Aggregate (IsStructure structure2) structure2 b
813+ , e ~ TheseTable a b
814+ , KnownSymbol label
815+ ) => K1Table label Aggregate 'True (Shape2 'These structure1 structure2) e
816+ where
817+ fromK1Columns =
818+ fromColumns2
819+ (fromK1Columns @"Here" @_ @_ @structure1)
820+ (fromK1Columns @"There" @_ @_ @structure2) .
821+ hunlabel unlabeler
822+ toK1Columns =
823+ hlabel labeler .
824+ toColumns2
825+ (toK1Columns @"Here" @_ @_ @structure1)
826+ (toK1Columns @"There" @_ @_ @structure2)
827+ {-# INLINABLE fromK1Columns #-}
828+ {-# INLINABLE toK1Columns #-}
829+
830+
831+instance
832+ ( HTable (K1Columns "Here" structure1)
833+ , HTable (K1Columns "There" structure2)
834+ , K1Table "Here" Expr (IsStructure structure1) structure1 a
835+ , K1Table "There" Expr (IsStructure structure2) structure2 b
836+ , e ~ TheseTable a b
837+ , KnownSymbol label
838+ ) => K1Table label Expr 'True (Shape2 'These structure1 structure2) e
839+ where
840+ fromK1Columns =
841+ fromColumns2
842+ (fromK1Columns @"Here" @_ @_ @structure1)
843+ (fromK1Columns @"There" @_ @_ @structure2) .
844+ hunlabel unlabeler
845+ toK1Columns =
846+ hlabel labeler .
847+ toColumns2
848+ (toK1Columns @"Here" @_ @_ @structure1)
849+ (toK1Columns @"There" @_ @_ @structure2)
850+ {-# INLINABLE fromK1Columns #-}
851+ {-# INLINABLE toK1Columns #-}
852+
853+
854+instance
855+ ( HTable (K1Columns "Here" structure1)
856+ , HTable (K1Columns "There" structure2)
857+ , K1Table "Here" Insert (IsStructure structure1) structure1 a
858+ , K1Table "There" Insert (IsStructure structure2) structure2 b
859+ , e ~ TheseTable a b
860+ , KnownSymbol label
861+ ) => K1Table label Insert 'True (Shape2 'These structure1 structure2) e
862+ where
863+ fromK1Columns =
864+ fromColumns2
865+ (fromK1Columns @"Here" @_ @_ @structure1)
866+ (fromK1Columns @"There" @_ @_ @structure2) .
867+ hunlabel unlabeler
868+ toK1Columns =
869+ hlabel labeler .
870+ toColumns2
871+ (toK1Columns @"Here" @_ @_ @structure1)
872+ (toK1Columns @"There" @_ @_ @structure2)
873+ {-# INLINABLE fromK1Columns #-}
874+ {-# INLINABLE toK1Columns #-}
875+
876+
877+instance
878+ ( HTable (K1Columns "Here" structure1)
879+ , HTable (K1Columns "There" structure2)
880+ , K1Table "Here" Identity (IsStructure structure1) structure1 a
881+ , K1Table "There" Identity (IsStructure structure2) structure2 b
882+ , e ~ These a b
883+ , KnownSymbol label
884+ ) => K1Table label Identity 'True (Shape2 'These structure1 structure2) e
885+ where
886+ fromK1Columns
887+ = bimap
888+ (fromK1Columns @"Here" @_ @_ @structure1)
889+ (fromK1Columns @"There" @_ @_ @structure2)
890+ . fromHTheseTable
891+ . hunlabel unlabeler
892+ toK1Columns
893+ = hlabel labeler
894+ . toHTheseTable
895+ . bimap
896+ (toK1Columns @"Here" @_ @_ @structure1)
897+ (toK1Columns @"There" @_ @_ @structure2)
898+ {-# INLINABLE fromK1Columns #-}
899+ {-# INLINABLE toK1Columns #-}
900+
901+
902+instance
903+ ( HTable (K1Columns "Here" structure1)
904+ , HTable (K1Columns "There" structure2)
905+ , K1Table "Here" Name (IsStructure structure1) structure1 a
906+ , K1Table "There" Name (IsStructure structure2) structure2 b
907+ , e ~ TheseTable a b
908+ , KnownSymbol label
909+ ) => K1Table label Name 'True (Shape2 'These structure1 structure2) e
910+ where
911+ fromK1Columns =
912+ fromColumns2
913+ (fromK1Columns @"Here" @_ @_ @structure1)
914+ (fromK1Columns @"There" @_ @_ @structure2) .
915+ hunlabel unlabeler
916+ toK1Columns =
917+ hlabel labeler .
918+ toColumns2
919+ (toK1Columns @"Here" @_ @_ @structure1)
920+ (toK1Columns @"There" @_ @_ @structure2)
921+ {-# INLINABLE fromK1Columns #-}
922+ {-# INLINABLE toK1Columns #-}
923+
924+
925+instance
926+ ( K1Table "fst" context (IsStructure structure1) structure1 a1
927+ , K1Table "snd" context (IsStructure structure2) structure2 a2
928+ , HTable (K1Columns "fst" structure1)
929+ , HTable (K1Columns "snd" structure2)
930+ , Labelable context
931+ , a ~ (a1, a2)
932+ , KnownSymbol label
933+ ) => K1Table label context 'True (structure1, structure2) a
934+ where
935+ fromK1Columns (hunlabel unlabeler -> (HPair a b)) =
936+ ( fromK1Columns @"fst" @_ @_ @structure1 a
937+ , fromK1Columns @"snd" @_ @_ @structure2 b
938+ )
939+ toK1Columns (a, b) = hlabel labeler $ HPair
940+ { hfst = toK1Columns @"fst" @_ @_ @structure1 a
941+ , hsnd = toK1Columns @"snd" @_ @_ @structure2 b
942+ }
943+ {-# INLINABLE fromK1Columns #-}
944+ {-# INLINABLE toK1Columns #-}
945+
946+
947+instance
948+ ( K1Table "fst" context (IsStructure structure1) structure1 a1
949+ , K1Table "snd" context (IsStructure structure2) structure2 a2
950+ , K1Table "trd" context (IsStructure structure3) structure3 a3
951+ , HTable (K1Columns "fst" structure1)
952+ , HTable (K1Columns "snd" structure2)
953+ , HTable (K1Columns "trd" structure3)
954+ , Labelable context
955+ , a ~ (a1, a2, a3)
956+ , KnownSymbol label
957+ ) => K1Table label context 'True (structure1, structure2, structure3) a
958+ where
959+ fromK1Columns (hunlabel unlabeler -> (HTrio a b c)) =
960+ ( fromK1Columns @"fst" @_ @_ @structure1 a
961+ , fromK1Columns @"snd" @_ @_ @structure2 b
962+ , fromK1Columns @"trd" @_ @_ @structure3 c
963+ )
964+ toK1Columns (a, b, c) = hlabel labeler $ HTrio
965+ { hfst = toK1Columns @"fst" @_ @_ @structure1 a
966+ , hsnd = toK1Columns @"snd" @_ @_ @structure2 b
967+ , htrd = toK1Columns @"trd" @_ @_ @structure3 c
968+ }
969+ {-# INLINABLE fromK1Columns #-}
970+ {-# INLINABLE toK1Columns #-}
971+
972+
973+instance
974+ ( K1Table "fst" context (IsStructure structure1) structure1 a1
975+ , K1Table "snd" context (IsStructure structure2) structure2 a2
976+ , K1Table "trd" context (IsStructure structure3) structure3 a3
977+ , K1Table "frt" context (IsStructure structure3) structure4 a4
978+ , HTable (K1Columns "fst" structure1)
979+ , HTable (K1Columns "snd" structure2)
980+ , HTable (K1Columns "trd" structure3)
981+ , HTable (K1Columns "frt" structure4)
982+ , Labelable context
983+ , a ~ (a1, a2, a3, a4)
984+ , KnownSymbol label
985+ ) => K1Table label context 'True (structure1, structure2, structure3, structure4) a
986+ where
987+ fromK1Columns (hunlabel unlabeler -> (HQuartet a b c d)) =
988+ ( fromK1Columns @"fst" @_ @_ @structure1 a
989+ , fromK1Columns @"snd" @_ @_ @structure2 b
990+ , fromK1Columns @"trd" @_ @_ @structure3 c
991+ , fromK1Columns @"frt" @_ @_ @structure4 d
992+ )
993+ toK1Columns (a, b, c, d) = hlabel labeler $ HQuartet
994+ { hfst = toK1Columns @"fst" @_ @_ @structure1 a
995+ , hsnd = toK1Columns @"snd" @_ @_ @structure2 b
996+ , htrd = toK1Columns @"trd" @_ @_ @structure3 c
997+ , hfrt = toK1Columns @"frt" @_ @_ @structure4 d
998+ }
999+ {-# INLINABLE fromK1Columns #-}
1000+ {-# INLINABLE toK1Columns #-}
1001+
1002+
1003+instance
1004+ ( K1Table "fst" context (IsStructure structure1) structure1 a1
1005+ , K1Table "snd" context (IsStructure structure2) structure2 a2
1006+ , K1Table "trd" context (IsStructure structure3) structure3 a3
1007+ , K1Table "frt" context (IsStructure structure3) structure4 a4
1008+ , K1Table "fft" context (IsStructure structure3) structure5 a5
1009+ , HTable (K1Columns "fst" structure1)
1010+ , HTable (K1Columns "snd" structure2)
1011+ , HTable (K1Columns "trd" structure3)
1012+ , HTable (K1Columns "frt" structure4)
1013+ , HTable (K1Columns "fft" structure5)
1014+ , Labelable context
1015+ , a ~ (a1, a2, a3, a4, a5)
1016+ , KnownSymbol label
1017+ ) => K1Table label context 'True (structure1, structure2, structure3, structure4, structure5) a
1018+ where
1019+ fromK1Columns (hunlabel unlabeler -> (HQuintet a b c d e)) =
1020+ ( fromK1Columns @"fst" @_ @_ @structure1 a
1021+ , fromK1Columns @"snd" @_ @_ @structure2 b
1022+ , fromK1Columns @"trd" @_ @_ @structure3 c
1023+ , fromK1Columns @"frt" @_ @_ @structure4 d
1024+ , fromK1Columns @"fft" @_ @_ @structure5 e
1025+ )
1026+ toK1Columns (a, b, c, d, e) = hlabel labeler $ HQuintet
1027+ { hfst = toK1Columns @"fst" @_ @_ @structure1 a
1028+ , hsnd = toK1Columns @"snd" @_ @_ @structure2 b
1029+ , htrd = toK1Columns @"trd" @_ @_ @structure3 c
1030+ , hfrt = toK1Columns @"frt" @_ @_ @structure4 d
1031+ , hfft = toK1Columns @"fft" @_ @_ @structure5 e
1032+ }
1033+ {-# INLINABLE fromK1Columns #-}
1034+ {-# INLINABLE toK1Columns #-}
1035+
1036+
1037+instance
1038+ ( IsStructure structure ~ 'False
1039+ , K1Columns label structure ~ HLabel label (Columns structure)
1040+ , Columns structure ~ Columns a
1041+ , Labelable context
1042+ , Table context a
1043+ , KnownSymbol label
1044+ ) => K1Table label context 'False structure a
1045+ where
1046+ fromK1Columns = fromColumns . hunlabel unlabeler
1047+ toK1Columns = hlabel labeler . toColumns
1048+ {-# INLINABLE fromK1Columns #-}
1049+ {-# INLINABLE toK1Columns #-}
src/Rel8/Schema/Generic/Test.hsnew file+79
@@ -0,0 +1,79 @@
1+{-# language DataKinds #-}
2+{-# language DeriveAnyClass #-}
3+{-# language DeriveGeneric #-}
4+{-# language DerivingStrategies #-}
5+{-# language DuplicateRecordFields #-}
6+
7+{-# options_ghc -O0 #-}
8+
9+module Rel8.Schema.Generic.Test
10+ ( module Rel8.Schema.Generic.Test
11+ )
12+where
13+
14+-- base
15+import GHC.Generics ( Generic )
16+import Prelude
17+
18+-- rel8
19+import Rel8.Schema.Column
20+import Rel8.Schema.Generic
21+
22+-- text
23+import Data.Text ( Text )
24+
25+
26+data Table f = Table
27+ { foo :: Column f (Label "blah" Bool)
28+ , bar :: Column f (Maybe Bool)
29+ }
30+ deriving stock Generic
31+ deriving anyclass Rel8able
32+
33+
34+data TablePair f = TablePair
35+ { foo :: Column f (Default Bool)
36+ , bars :: (Column f Text, Column f Text)
37+ }
38+ deriving stock Generic
39+ deriving anyclass Rel8able
40+
41+
42+data TableMaybe f = TableMaybe
43+ { foo :: Column f (Label "ABC" [Maybe Bool])
44+ , bars :: HMaybe f (TablePair f, TablePair f)
45+ }
46+ deriving stock Generic
47+ deriving anyclass Rel8able
48+
49+
50+data TableEither f = TableEither
51+ { foo :: Column f Bool
52+ , bars :: HEither f (HMaybe f (TablePair f, TablePair f)) (Column f (Label "XYZ" Char))
53+ }
54+ deriving stock Generic
55+ deriving anyclass Rel8able
56+
57+
58+data TableThese f = TableThese
59+ { foo :: Column f Bool
60+ , bars :: HThese f (TableMaybe f) (TableEither f)
61+ }
62+ deriving stock Generic
63+ deriving anyclass Rel8able
64+
65+
66+data TableList f = TableList
67+ { foo :: Column f Bool
68+ , bars :: HList f (TableThese f)
69+ }
70+ deriving stock Generic
71+ deriving anyclass Rel8able
72+
73+
74+data TableNonEmpty f = TableNonEmpty
75+ { foo :: Column f Bool
76+ , bars :: HNonEmpty f (TableList f)
77+ }
78+ deriving stock Generic
79+ deriving anyclass Rel8able
src/Rel8/Schema/HTable.hs+36−68
@@ -16,12 +16,11 @@
16module Rel8.Schema.HTable
16module Rel8.Schema.HTable
17 ( HTable (HField, HConstrainTable)
17 ( HTable (HField, HConstrainTable)
18 , hfield, htabulate, htraverse, hdicts, hspecs
18 , hfield, htabulate, htraverse, hdicts, hspecs
19− , hfoldMap, hmap, htabulateA, htraverseP, htraversePWithField
19+ , htabulateA
20 )
20 )
21where
21where
22
22
23-- base
23-- base
24−import Data.Functor.Const ( Const( Const ), getConst )
25import Data.Kind ( Constraint, Type )
24import Data.Kind ( Constraint, Type )
26import Data.Functor.Compose ( Compose( Compose ), getCompose )
25import Data.Functor.Compose ( Compose( Compose ), getCompose )
27import Data.Proxy ( Proxy )
26import Data.Proxy ( Proxy )
@@ -33,21 +32,16 @@ import GHC.Generics
33 )
32 )
34import Prelude
33import Prelude
35
34
36−-- profunctors
37−import Data.Profunctor ( rmap, Profunctor (lmap) )
38−
39−-- product-profunctors
40−import Data.Profunctor.Product ( ProductProfunctor ((****)) )
41−
42-- rel8
35-- rel8
43import Rel8.Schema.Dict ( Dict )
36import Rel8.Schema.Dict ( Dict )
44−import Rel8.Schema.Spec ( Spec )
37+import Rel8.Schema.Spec ( Spec, SSpec )
45−import Rel8.Schema.HTable.Product ( HProduct( HProduct ) )
38+import Rel8.Schema.HTable.Pair ( HPair( HPair ) )
46import qualified Rel8.Schema.Kind as K
39import qualified Rel8.Schema.Kind as K
47
40
48-- semigroupoids
41-- semigroupoids
49import Data.Functor.Apply ( Apply, (<.>) )
42import Data.Functor.Apply ( Apply, (<.>) )
50
43
44+
51-- | A @HTable@ is a functor-indexed/higher-kinded data type that is
45-- | A @HTable@ is a functor-indexed/higher-kinded data type that is
52-- representable ('htabulate'/'hfield'), constrainable ('hdicts'), and
46-- representable ('htabulate'/'hfield'), constrainable ('hdicts'), and
53-- specified ('hspecs').
47-- specified ('hspecs').
@@ -56,14 +50,14 @@ import Data.Functor.Apply ( Apply, (<.>) )
56-- instances yourself or specify this constraint.
50-- instances yourself or specify this constraint.
57type HTable :: K.HTable -> Constraint
51type HTable :: K.HTable -> Constraint
58class HTable t where
52class HTable t where
59− type HField t = (field :: Type -> Type) | field -> t
53+ type HField t = (field :: Spec -> Type) | field -> t
60− type HConstrainTable t (c :: Type -> Constraint) :: Constraint
54+ type HConstrainTable t (c :: Spec -> Constraint) :: Constraint
61
55
62− hfield :: t context -> HField t a -> context a
56+ hfield :: t context -> HField t spec -> context spec
63− htabulate :: (forall a. HField t a -> context a) -> t context
57+ htabulate :: (forall spec. HField t spec -> context spec) -> t context
64− htraverse :: Apply m => (forall a. f a -> m (g a)) -> t f -> m (t g)
58+ htraverse :: Apply m => (forall spec. f spec -> m (g spec)) -> t f -> m (t g)
65 hdicts :: HConstrainTable t c => t (Dict c)
59 hdicts :: HConstrainTable t c => t (Dict c)
66− hspecs :: t Spec
60+ hspecs :: t SSpec
67
61
68 type HField t = GHField t
62 type HField t = GHField t
69 type HConstrainTable t c = HConstrainTable (GHColumns (Rep (t Proxy))) c
63 type HConstrainTable t c = HConstrainTable (GHColumns (Rep (t Proxy))) c
@@ -74,7 +68,7 @@ class HTable t where
74 , HField (GHColumns (Rep (t Proxy))) ~ HField (GHColumns (Rep (t context)))
68 , HField (GHColumns (Rep (t Proxy))) ~ HField (GHColumns (Rep (t context)))
75 , GHTable context (Rep (t context))
69 , GHTable context (Rep (t context))
76 )
70 )
77− => t context -> HField t a -> context a
71+ => t context -> HField t spec -> context spec
78 hfield table (GHField field) = hfield (toGHColumns (from table)) field
72 hfield table (GHField field) = hfield (toGHColumns (from table)) field
79
73
80 default htabulate ::
74 default htabulate ::
@@ -83,7 +77,7 @@ class HTable t where
83 , HField (GHColumns (Rep (t Proxy))) ~ HField (GHColumns (Rep (t context)))
77 , HField (GHColumns (Rep (t Proxy))) ~ HField (GHColumns (Rep (t context)))
84 , GHTable context (Rep (t context))
78 , GHTable context (Rep (t context))
85 )
79 )
86− => (forall a. HField t a -> context a) -> t context
80+ => (forall spec. HField t spec -> context spec) -> t context
87 htabulate f = to $ fromGHColumns $ htabulate (f . GHField)
81 htabulate f = to $ fromGHColumns $ htabulate (f . GHField)
88
82
89 default htraverse
83 default htraverse
@@ -93,7 +87,7 @@ class HTable t where
93 , Generic (t g), GHTable g (Rep (t g))
87 , Generic (t g), GHTable g (Rep (t g))
94 , GHColumns (Rep (t f)) ~ GHColumns (Rep (t g))
88 , GHColumns (Rep (t f)) ~ GHColumns (Rep (t g))
95 )
89 )
96− => (forall a. f a -> m (g a)) -> t f -> m (t g)
90+ => (forall spec. f spec -> m (g spec)) -> t f -> m (t g)
97 htraverse f = fmap (to . fromGHColumns) . htraverse f . toGHColumns . from
91 htraverse f = fmap (to . fromGHColumns) . htraverse f . toGHColumns . from
98
92
99 default hdicts
93 default hdicts
@@ -107,10 +101,10 @@ class HTable t where
107 hdicts = to $ fromGHColumns (hdicts @(GHColumns (Rep (t Proxy))) @c)
101 hdicts = to $ fromGHColumns (hdicts @(GHColumns (Rep (t Proxy))) @c)
108
102
109 default hspecs ::
103 default hspecs ::
110− ( Generic (t Spec)
104+ ( Generic (t SSpec)
111− , GHTable Spec (Rep (t Spec))
105+ , GHTable SSpec (Rep (t SSpec))
112 )
106 )
113− => t Spec
107+ => t SSpec
114 hspecs = to $ fromGHColumns hspecs
108 hspecs = to $ fromGHColumns hspecs
115
109
116 {-# INLINABLE hfield #-}
110 {-# INLINABLE hfield #-}
@@ -120,43 +114,17 @@ class HTable t where
120 {-# INLINABLE hspecs #-}
114 {-# INLINABLE hspecs #-}
121
115
122
116
123−hfoldMap :: (HTable t, Semigroup s)
124− => (forall a. context a -> s) -> t context -> s
125−hfoldMap f a = getConst $ htraverse (Const . f) a
126−
127−
128−hmap :: HTable t
129− => (forall a. context a -> context' a) -> t context -> t context'
130−hmap f a = htabulate $ \field -> f (hfield a field)
131−
132−
133htabulateA :: (HTable t, Apply m)
117htabulateA :: (HTable t, Apply m)
134− => (forall a. HField t a -> m (context a)) -> m (t context)
118+ => (forall spec. HField t spec -> m (context spec)) -> m (t context)
135htabulateA f = htraverse getCompose $ htabulate $ Compose . f
119htabulateA f = htraverse getCompose $ htabulate $ Compose . f
136{-# INLINABLE htabulateA #-}
120{-# INLINABLE htabulateA #-}
137
121
138−newtype ApplyP p a b = ApplyP { unApplyP :: p a b }
139−
140−instance Profunctor p => Functor (ApplyP p a) where
141− fmap f = ApplyP . rmap f . unApplyP
142−
143−instance ProductProfunctor p => Apply (ApplyP p a) where
144− ApplyP f <.> ApplyP x = ApplyP (rmap id f **** x)
145−
146−htraverseP :: (HTable t, ProductProfunctor p)
147− => (forall a. p (f a) (g a)) -> p (t f) (t g)
148−htraverseP f = htraversePWithField (const f)
149−
150−htraversePWithField :: (HTable t, ProductProfunctor p)
151− => (forall a. HField t a -> p (f a) (g a)) -> p (t f) (t g)
152−htraversePWithField f = unApplyP $ htabulateA $ \field -> ApplyP $
153− lmap (flip hfield field) (f field)
154
122
155−type GHField :: K.HTable -> Type -> Type
123+type GHField :: K.HTable -> Spec -> Type
156−newtype GHField t a = GHField (HField (GHColumns (Rep (t Proxy))) a)
124+newtype GHField t spec = GHField (HField (GHColumns (Rep (t Proxy))) spec)
157
125
158
126
159−type GHTable :: K.Context -> (Type -> Type) -> Constraint
127+type GHTable :: K.HContext -> (Type -> Type) -> Constraint
160class HTable (GHColumns rep) => GHTable context rep | rep -> context where
128class HTable (GHColumns rep) => GHTable context rep | rep -> context where
161 type GHColumns rep :: K.HTable
129 type GHColumns rep :: K.HTable
162 toGHColumns :: rep x -> GHColumns rep context
130 toGHColumns :: rep x -> GHColumns rep context
@@ -176,30 +144,30 @@ instance HTable table => GHTable context (K1 i (table context)) where
176
144
177
145
178instance (GHTable context a, GHTable context b) => GHTable context (a :*: b) where
146instance (GHTable context a, GHTable context b) => GHTable context (a :*: b) where
179− type GHColumns (a :*: b) = HProduct (GHColumns a) (GHColumns b)
147+ type GHColumns (a :*: b) = HPair (GHColumns a) (GHColumns b)
180− toGHColumns (a :*: b) = HProduct (toGHColumns a) (toGHColumns b)
148+ toGHColumns (a :*: b) = HPair (toGHColumns a) (toGHColumns b)
181− fromGHColumns (HProduct a b) = fromGHColumns a :*: fromGHColumns b
149+ fromGHColumns (HPair a b) = fromGHColumns a :*: fromGHColumns b
182
150
183
151
184−-- | A HField type for indexing into HProduct.
152+-- | A HField type for indexing into HPair.
185−type HProductField :: K.HTable -> K.HTable -> Type -> Type
153+type HPairField :: K.HTable -> K.HTable -> Spec -> Type
186−data HProductField x y a
154+data HPairField x y spec
187− = HFst (HField x a)
155+ = HFst (HField x spec)
188− | HSnd (HField y a)
156+ | HSnd (HField y spec)
189
157
190
158
191−instance (HTable x, HTable y) => HTable (HProduct x y) where
159+instance (HTable x, HTable y) => HTable (HPair x y) where
192− type HConstrainTable (HProduct x y) c = (HConstrainTable x c, HConstrainTable y c)
160+ type HConstrainTable (HPair x y) c = (HConstrainTable x c, HConstrainTable y c)
193− type HField (HProduct x y) = HProductField x y
161+ type HField (HPair x y) = HPairField x y
194
162
195− hfield (HProduct l r) = \case
163+ hfield (HPair l r) = \case
196 HFst i -> hfield l i
164 HFst i -> hfield l i
197 HSnd i -> hfield r i
165 HSnd i -> hfield r i
198
166
199− htabulate f = HProduct (htabulate (f . HFst)) (htabulate (f . HSnd))
167+ htabulate f = HPair (htabulate (f . HFst)) (htabulate (f . HSnd))
200− htraverse f (HProduct x y) = HProduct <$> htraverse f x <.> htraverse f y
168+ htraverse f (HPair x y) = HPair <$> htraverse f x <.> htraverse f y
201− hdicts = HProduct hdicts hdicts
169+ hdicts = HPair hdicts hdicts
202− hspecs = HProduct hspecs hspecs
170+ hspecs = HPair hspecs hspecs
203
171
204 {-# INLINABLE hfield #-}
172 {-# INLINABLE hfield #-}
205 {-# INLINABLE htabulate #-}
173 {-# INLINABLE htabulate #-}
src/Rel8/Schema/HTable/Either.hs+17−5
@@ -2,31 +2,43 @@
2{-# language DeriveAnyClass #-}
2{-# language DeriveAnyClass #-}
3{-# language DeriveGeneric #-}
3{-# language DeriveGeneric #-}
4{-# language DerivingStrategies #-}
4{-# language DerivingStrategies #-}
5+{-# language FlexibleInstances #-}
5{-# language StandaloneKindSignatures #-}
6{-# language StandaloneKindSignatures #-}
7+{-# language UndecidableInstances #-}
8+{-# language UndecidableSuperClasses #-}
6
9
7module Rel8.Schema.HTable.Either
10module Rel8.Schema.HTable.Either
8 ( HEitherTable(..)
11 ( HEitherTable(..)
12+ , HEitherNullifiable
9 )
13 )
10where
14where
11
15
12-- base
16-- base
17+import Data.Kind ( Constraint )
13import GHC.Generics ( Generic )
18import GHC.Generics ( Generic )
14import Prelude ()
19import Prelude ()
15
20
16-- rel8
21-- rel8
22+import Rel8.Kind.Necessity ( Necessity( Required ) )
23+import Rel8.Schema.Context.Nullify ( HNullifiable, HConstrainTag )
17import Rel8.Schema.HTable ( HTable )
24import Rel8.Schema.HTable ( HTable )
18−import Rel8.Schema.HTable.Identity ( HIdentity )
25+import Rel8.Schema.HTable.Identity ( HIdentity(..) )
19−import Rel8.Schema.HTable.Label ( HLabel )
20import Rel8.Schema.HTable.Nullify ( HNullify )
26import Rel8.Schema.HTable.Nullify ( HNullify )
21import qualified Rel8.Schema.Kind as K
27import qualified Rel8.Schema.Kind as K
28+import Rel8.Schema.Spec ( Spec( Spec ) )
22import Rel8.Type.Tag ( EitherTag )
29import Rel8.Type.Tag ( EitherTag )
23
30
24
31
25type HEitherTable :: K.HTable -> K.HTable -> K.HTable
32type HEitherTable :: K.HTable -> K.HTable -> K.HTable
26data HEitherTable left right context = HEitherTable
33data HEitherTable left right context = HEitherTable
27− { htag :: HLabel "isRight" (HIdentity EitherTag) context
34+ { htag :: HIdentity ('Spec '["isRight"] 'Required EitherTag) context
28− , hleft :: HLabel "Left" (HNullify left) context
35+ , hleft :: HNullify left context
29− , hright :: HLabel "Right" (HNullify right) context
36+ , hright :: HNullify right context
30 }
37 }
31 deriving stock Generic
38 deriving stock Generic
32 deriving anyclass HTable
39 deriving anyclass HTable
40+
41+
42+type HEitherNullifiable :: K.HContext -> Constraint
43+class (HNullifiable context, HConstrainTag context EitherTag) => HEitherNullifiable context
44+instance (HNullifiable context, HConstrainTag context EitherTag) => HEitherNullifiable context
src/Rel8/Schema/HTable/Identity.hs+17−16
@@ -1,17 +1,15 @@
1{-# language DataKinds #-}
1{-# language DataKinds #-}
2−{-# language FlexibleContexts #-}
2+{-# language GADTs #-}
3{-# language StandaloneKindSignatures #-}
3{-# language StandaloneKindSignatures #-}
4{-# language TypeFamilies #-}
4{-# language TypeFamilies #-}
5−{-# language UndecidableInstances #-}
6
5
7module Rel8.Schema.HTable.Identity
6module Rel8.Schema.HTable.Identity
8− ( HIdentity( HIdentity, unHIdentity )
7+ ( HIdentity(..)
9 )
8 )
10where
9where
11
10
12-- base
11-- base
13import Data.Kind ( Type )
12import Data.Kind ( Type )
14−import Data.Type.Equality ( (:~:)( Refl ) )
15import Prelude
13import Prelude
16
14
17-- rel8
15-- rel8
@@ -21,23 +19,26 @@ import Rel8.Schema.HTable
21 , hfield, htabulate, htraverse, hdicts, hspecs
19 , hfield, htabulate, htraverse, hdicts, hspecs
22 )
20 )
23import qualified Rel8.Schema.Kind as K
21import qualified Rel8.Schema.Kind as K
24−import Rel8.Schema.Null ( Sql )
22+import Rel8.Schema.Spec ( Spec, KnownSpec, specSing )
25−import Rel8.Schema.Spec ( specification )
26−import Rel8.Type ( DBType )
27
23
28
24
29−type HIdentity :: Type -> K.HTable
25+type HIdentity :: Spec -> K.HTable
30−newtype HIdentity a context = HIdentity
26+newtype HIdentity spec context = HIdentity
31− { unHIdentity :: context a
27+ { unHIdentity :: context spec
32 }
28 }
33
29
34
30
35−instance Sql DBType a => HTable (HIdentity a) where
31+type HIdentityField :: Spec -> Spec -> Type
36− type HConstrainTable (HIdentity a) constraint = constraint a
32+data HIdentityField _spec spec where
37− type HField (HIdentity a) = (:~:) a
33+ HIdentityField :: HIdentityField spec spec
38
34
35+
36+instance KnownSpec spec => HTable (HIdentity spec) where
37+ type HConstrainTable (HIdentity spec) c = c spec
38+ type HField (HIdentity spec) = HIdentityField spec
39+
39− hfield (HIdentity a) Refl = a
40+ hfield (HIdentity a) HIdentityField = a
40− htabulate f = HIdentity $ f Refl
41+ htabulate f = HIdentity $ f HIdentityField
41 htraverse f (HIdentity a) = HIdentity <$> f a
42 htraverse f (HIdentity a) = HIdentity <$> f a
42 hdicts = HIdentity Dict
43 hdicts = HIdentity Dict
43− hspecs = HIdentity specification
44+ hspecs = HIdentity specSing
src/Rel8/Schema/HTable/Label.hs+51−36
@@ -1,70 +1,85 @@
1+{-# LANGUAGE DeriveAnyClass #-}
2+{-# LANGUAGE DeriveGeneric #-}
3+{-# LANGUAGE DerivingStrategies #-}
4+{-# LANGUAGE LambdaCase #-}
5+{-# language ConstraintKinds #-}
1{-# language DataKinds #-}
6{-# language DataKinds #-}
7+{-# language FlexibleInstances #-}
8+{-# language GADTs #-}
9+{-# language InstanceSigs #-}
10+{-# language MultiParamTypeClasses #-}
11+{-# language QuantifiedConstraints #-}
2{-# language RankNTypes #-}
12{-# language RankNTypes #-}
3{-# language RecordWildCards #-}
13{-# language RecordWildCards #-}
4{-# language ScopedTypeVariables #-}
14{-# language ScopedTypeVariables #-}
5{-# language StandaloneKindSignatures #-}
15{-# language StandaloneKindSignatures #-}
6{-# language TypeApplications #-}
16{-# language TypeApplications #-}
7{-# language TypeFamilies #-}
17{-# language TypeFamilies #-}
18+{-# language TypeOperators #-}
19+{-# language UndecidableInstances #-}
8
20
9module Rel8.Schema.HTable.Label
21module Rel8.Schema.HTable.Label
22+ ( HLabel, Label
10− ( HLabel, hlabel, hrelabel, hunlabel
23+ , hlabel, hunlabel
11− , hproject
12 )
24 )
13where
25where
14
26
15-- base
27-- base
16−import Data.Kind ( Type )
17import Data.Proxy ( Proxy( Proxy ) )
28import Data.Proxy ( Proxy( Proxy ) )
18−import GHC.TypeLits ( KnownSymbol, Symbol, symbolVal )
29+import GHC.TypeLits ( KnownSymbol, Symbol )
19import Prelude
30import Prelude
20
31
21-- rel8
32-- rel8
33+import Rel8.Kind.Labels ( SLabels( SLabels ) )
22import Rel8.Schema.HTable
34import Rel8.Schema.HTable
23− ( HTable, HConstrainTable, HField
35+ ( HTable
24− , htabulate, hfield, htraverse, hdicts, hspecs
36+ , hfield, htabulate, hspecs
25 )
37 )
26import qualified Rel8.Schema.Kind as K
38import qualified Rel8.Schema.Kind as K
27−import Rel8.Schema.Spec ( Spec(..) )
39+import Rel8.Schema.Spec ( Spec( Spec ), SSpec(..) )
40+import Rel8.FCF
41+import Rel8.Schema.HTable.MapTable
42+import GHC.Generics (Generic)
28
43
29
44
30type HLabel :: Symbol -> K.HTable -> K.HTable
45type HLabel :: Symbol -> K.HTable -> K.HTable
31−newtype HLabel label table context = HLabel (table context)
46+newtype HLabel label table context = HLabel (HMapTable (Label label) table context)
47+ deriving stock Generic
48+ deriving anyclass HTable
32
49
33
50
34−type HLabelField :: Symbol -> K.HTable -> Type -> Type
51+data Label :: Symbol -> Spec -> Exp Spec
35−newtype HLabelField label table a = HLabelField (HField table a)
36
52
37
53
38−instance (HTable table, KnownSymbol label) => HTable (HLabel label table) where
54+type instance Eval (Label label ('Spec labels necessity a)) = 'Spec (label : labels) necessity a
39− type HField (HLabel label table) = HLabelField label table
40− type HConstrainTable (HLabel label table) constraint =
41− HConstrainTable table constraint
42
55
43− hfield (HLabel a) (HLabelField field) = hfield a field
44− htabulate f = HLabel (htabulate (f . HLabelField))
45− htraverse f (HLabel a) = HLabel <$> htraverse f a
46− hdicts = HLabel (hdicts @table)
47− hspecs = HLabel $ htabulate $ \field -> case hfield (hspecs @table) field of
48− Spec {..} -> Spec {labels = symbolVal (Proxy @label) : labels, ..}
49− {-# INLINABLE hspecs #-}
50
56
51−
57+instance KnownSymbol l => MapSpec (Label l) where
52−hlabel :: forall label t context. t context -> HLabel label t context
58+ mapInfo = \case
53−hlabel = HLabel
59+ SSpec {..} -> SSpec {labels = SLabels Proxy labels, ..}
54−{-# INLINABLE hlabel #-}
55
60
56
61
62+hlabel :: (HTable t, KnownSymbol label)
63+ => (forall labels necessity a. ()
64+ => context ('Spec labels necessity a)
65+ -> context ('Spec (label ': labels) necessity a))
66+ -> t context
57−hrelabel :: forall label' label t context. HLabel label t context -> HLabel label' t context
67+ -> HLabel label t context
58−hrelabel = hlabel . hunlabel
68+hlabel labeler a = HLabel $ htabulate $ \(HMapTableField field) ->
69+ case hfield hspecs field of
70+ SSpec {} -> labeler (hfield a field)
59−{-# INLINABLE hrelabel #-}
71+{-# INLINABLE hlabel #-}
60
72
61
73
74+hunlabel :: (HTable t, KnownSymbol label)
75+ => (forall labels necessity a. ()
76+ => context ('Spec (label ': labels) necessity a)
77+ -> context ('Spec labels necessity a))
62−hunlabel :: forall label t context. HLabel label t context -> t context
78+ -> HLabel label t context
79+ -> t context
63−hunlabel (HLabel a) = a
80+hunlabel unlabler (HLabel as) =
81+ htabulate $ \field ->
82+ case hfield hspecs field of
83+ SSpec {} -> case hfield as (HMapTableField field) of
84+ a -> unlabler a
64{-# INLINABLE hunlabel #-}
85{-# INLINABLE hunlabel #-}
65−
66−
67−hproject :: ()
68− => (forall ctx. t ctx -> t' ctx)
69− -> HLabel label t context -> HLabel label t' context
70−hproject f (HLabel a) = HLabel (f a)
src/Rel8/Schema/HTable/MapTable.hs+14−28
@@ -6,7 +6,7 @@
6{-# language GADTs #-}
6{-# language GADTs #-}
7{-# language InstanceSigs #-}
7{-# language InstanceSigs #-}
8{-# language MultiParamTypeClasses #-}
8{-# language MultiParamTypeClasses #-}
9−{-# language RankNTypes #-}
9+{-# language PolyKinds #-}
10{-# language ScopedTypeVariables #-}
10{-# language ScopedTypeVariables #-}
11{-# language StandaloneKindSignatures #-}
11{-# language StandaloneKindSignatures #-}
12{-# language TypeApplications #-}
12{-# language TypeApplications #-}
@@ -19,38 +19,32 @@ module Rel8.Schema.HTable.MapTable
19 , MapSpec(..)
19 , MapSpec(..)
20 , Precompose(..)
20 , Precompose(..)
21 , HMapTableField(..)
21 , HMapTableField(..)
22− , hproject
23 )
22 )
24where
23where
25
24
26-- base
25-- base
27import Data.Kind ( Constraint, Type )
26import Data.Kind ( Constraint, Type )
28−import Prelude
27+import Prelude ( ($), (.), (<$>), fmap )
29
28
30-- rel8
29-- rel8
31−import Rel8.FCF ( Exp, Eval )
30+import Rel8.FCF
32import Rel8.Schema.HTable
31import Rel8.Schema.HTable
33− ( HTable, HConstrainTable, HField
34− , hfield, htabulate, htraverse, hdicts, hspecs
35− )
36−import Rel8.Schema.Spec ( Spec )
32+import Rel8.Schema.Spec ( Spec, SSpec )
37import qualified Rel8.Schema.Kind as K
33import qualified Rel8.Schema.Kind as K
38import Rel8.Schema.Dict ( Dict( Dict ) )
34import Rel8.Schema.Dict ( Dict( Dict ) )
39
35
40
36
41−type HMapTable :: (Type -> Exp Type) -> K.HTable -> K.HTable
37+type HMapTable :: (a -> Exp b) -> ((a -> Type) -> Type) -> (b -> Type) -> Type
42−newtype HMapTable f t context = HMapTable
38+data HMapTable f t g where
43− { unHMapTable :: t (Precompose f context)
39+ HMapTable :: { unHMapTable :: t (Precompose f g) } -> HMapTable f t g
44− }
45
40
46
41
47−type Precompose :: (Type -> Exp Type) -> K.Context -> K.Context
42+type Precompose :: (a -> Exp b) -> (b -> Type) -> a -> Type
48−newtype Precompose f g x = Precompose
43+newtype Precompose f g x where
49− { precomposed :: g (Eval (f x))
44+ Precompose :: { precomposed :: g (Eval (f x)) } -> Precompose f g x
50− }
51
45
52
46
53−type HMapTableField :: (Type -> Exp Type) -> K.HTable -> K.Context
47+type HMapTableField :: (Spec -> Exp a) -> K.HTable -> a -> Type
54data HMapTableField f t x where
48data HMapTableField f t x where
55 HMapTableField :: HField t a -> HMapTableField f t (Eval (f a))
49 HMapTableField :: HField t a -> HMapTableField f t (Eval (f a))
56
50
@@ -70,7 +64,6 @@ instance (HTable t, MapSpec f) => HTable (HMapTable f t) where
70
64
71 htraverse f (HMapTable x) =
65 htraverse f (HMapTable x) =
72 HMapTable <$> htraverse (fmap Precompose . f . precomposed) x
66 HMapTable <$> htraverse (fmap Precompose . f . precomposed) x
73− {-# INLINABLE htraverse #-}
74
67
75 hdicts :: forall c. HConstrainTable (HMapTable f t) c => HMapTable f t (Dict c)
68 hdicts :: forall c. HConstrainTable (HMapTable f t) c => HMapTable f t (Dict c)
76 hdicts =
69 hdicts =
@@ -80,20 +73,13 @@ instance (HTable t, MapSpec f) => HTable (HMapTable f t) where
80
73
81 hspecs =
74 hspecs =
82 HMapTable $ htabulate $ Precompose . mapInfo @f . hfield hspecs
75 HMapTable $ htabulate $ Precompose . mapInfo @f . hfield hspecs
83− {-# INLINABLE hspecs #-}
84
76
85
77
86−type MapSpec :: (Type -> Exp Type) -> Constraint
78+type MapSpec :: (Spec -> Exp Spec) -> Constraint
87class MapSpec f where
79class MapSpec f where
88− mapInfo :: Spec x -> Spec (Eval (f x))
80+ mapInfo :: SSpec x -> SSpec (Eval (f x))
89
81
90
82
91−type ComposeConstraint :: (Type -> Exp Type) -> (Type -> Constraint) -> Type -> Constraint
83+type ComposeConstraint :: (a -> Exp b) -> (b -> Constraint) -> a -> Constraint
92class c (Eval (f a)) => ComposeConstraint f c a
84class c (Eval (f a)) => ComposeConstraint f c a
93instance c (Eval (f a)) => ComposeConstraint f c a
85instance c (Eval (f a)) => ComposeConstraint f c a
94−
95−
96−hproject :: ()
97− => (forall ctx. t ctx -> t' ctx)
98− -> HMapTable f t context -> HMapTable f t' context
99−hproject f (HMapTable a) = HMapTable (f a)
src/Rel8/Schema/HTable/Maybe.hs+17−5
@@ -2,30 +2,42 @@
2{-# language DeriveAnyClass #-}
2{-# language DeriveAnyClass #-}
3{-# language DeriveGeneric #-}
3{-# language DeriveGeneric #-}
4{-# language DerivingStrategies #-}
4{-# language DerivingStrategies #-}
5+{-# language FlexibleInstances #-}
5{-# language StandaloneKindSignatures #-}
6{-# language StandaloneKindSignatures #-}
7+{-# language UndecidableInstances #-}
8+{-# language UndecidableSuperClasses #-}
6
9
7module Rel8.Schema.HTable.Maybe
10module Rel8.Schema.HTable.Maybe
8 ( HMaybeTable(..)
11 ( HMaybeTable(..)
12+ , HMaybeNullifiable
9 )
13 )
10where
14where
11
15
12-- base
16-- base
17+import Data.Kind ( Constraint )
13import GHC.Generics ( Generic )
18import GHC.Generics ( Generic )
14import Prelude
19import Prelude
15
20
16-- rel8
21-- rel8
22+import Rel8.Kind.Necessity ( Necessity( Required ) )
23+import Rel8.Schema.Context.Nullify ( HConstrainTag, HNullifiable )
17import Rel8.Schema.HTable ( HTable )
24import Rel8.Schema.HTable ( HTable )
18−import Rel8.Schema.HTable.Identity ( HIdentity )
25+import Rel8.Schema.HTable.Identity ( HIdentity(..) )
19−import Rel8.Schema.HTable.Label ( HLabel )
20−import Rel8.Schema.HTable.Nullify ( HNullify )
21import qualified Rel8.Schema.Kind as K
26import qualified Rel8.Schema.Kind as K
27+import Rel8.Schema.Spec ( Spec( Spec ) )
22import Rel8.Type.Tag ( MaybeTag )
28import Rel8.Type.Tag ( MaybeTag )
29+import Rel8.Schema.HTable.Nullify ( HNullify )
23
30
24
31
25type HMaybeTable :: K.HTable -> K.HTable
32type HMaybeTable :: K.HTable -> K.HTable
26data HMaybeTable table context = HMaybeTable
33data HMaybeTable table context = HMaybeTable
27− { htag :: HLabel "isJust" (HIdentity (Maybe MaybeTag)) context
34+ { htag :: HIdentity ('Spec '["isJust"] 'Required (Maybe MaybeTag)) context
28− , hjust :: HLabel "Just" (HNullify table) context
35+ , hjust :: HNullify table context
29 }
36 }
30 deriving stock Generic
37 deriving stock Generic
31 deriving anyclass HTable
38 deriving anyclass HTable
39+
40+
41+type HMaybeNullifiable :: K.HContext -> Constraint
42+class (HNullifiable context, HConstrainTag context MaybeTag) => HMaybeNullifiable context
43+instance (HNullifiable context, HConstrainTag context MaybeTag) => HMaybeNullifiable context
src/Rel8/Schema/HTable/Nullify.hs+46−55
@@ -1,52 +1,48 @@
1+{-# LANGUAGE DeriveAnyClass #-}
2+{-# LANGUAGE DerivingStrategies #-}
3+{-# LANGUAGE DeriveGeneric #-}
4+{-# LANGUAGE NamedFieldPuns #-}
5+{-# LANGUAGE LambdaCase #-}
1{-# language ConstraintKinds #-}
6{-# language ConstraintKinds #-}
2{-# language DataKinds #-}
7{-# language DataKinds #-}
3−{-# language DeriveAnyClass #-}
4−{-# language DerivingStrategies #-}
5−{-# language DeriveGeneric #-}
6{-# language FlexibleInstances #-}
8{-# language FlexibleInstances #-}
7{-# language GADTs #-}
9{-# language GADTs #-}
8−{-# language LambdaCase #-}
10+{-# language InstanceSigs #-}
9{-# language MultiParamTypeClasses #-}
11{-# language MultiParamTypeClasses #-}
10−{-# language NamedFieldPuns #-}
11{-# language QuantifiedConstraints #-}
12{-# language QuantifiedConstraints #-}
12{-# language RankNTypes #-}
13{-# language RankNTypes #-}
13{-# language RecordWildCards #-}
14{-# language RecordWildCards #-}
14{-# language ScopedTypeVariables #-}
15{-# language ScopedTypeVariables #-}
15{-# language StandaloneKindSignatures #-}
16{-# language StandaloneKindSignatures #-}
17+{-# language TypeApplications #-}
16{-# language TypeFamilies #-}
18{-# language TypeFamilies #-}
17{-# language UndecidableInstances #-}
19{-# language UndecidableInstances #-}
18
20
19module Rel8.Schema.HTable.Nullify
21module Rel8.Schema.HTable.Nullify
20 ( HNullify( HNullify )
22 ( HNullify( HNullify )
21 , Nullify
23 , Nullify
22− , hguard
23− , hnulls
24− , hnullify
25− , hunnullify
24+ , hnulls, hnullify, hunnullify
26− , hproject
27 )
25 )
28where
26where
29
27
30-- base
28-- base
31−import Data.Kind ( Type )
32−import GHC.Generics ( Generic )
33import Prelude hiding ( null )
29import Prelude hiding ( null )
34
30
35-- rel8
31-- rel8
36−import Rel8.FCF ( Eval, Exp )
32+import Rel8.Schema.HTable
33+ ( HTable
37−import Rel8.Schema.HTable ( HTable, hfield, htabulate, htabulateA, hspecs )
34+ , hfield, htabulate, htabulateA, hspecs
38−import Rel8.Schema.HTable.MapTable
39− ( HMapTable, HMapTableField( HMapTableField )
40− , MapSpec, mapInfo
41 )
35 )
42−import qualified Rel8.Schema.HTable.MapTable as HMapTable ( hproject )
43import qualified Rel8.Schema.Kind as K
36import qualified Rel8.Schema.Kind as K
44−import Rel8.Schema.Null ( Nullity( Null, NotNull ) )
37+import Rel8.Schema.Nullability ( Nullability( Nullable, NonNullable ) )
45−import qualified Rel8.Schema.Null as Type ( Nullify )
38+import qualified Rel8.Schema.Nullability as Type ( Nullify )
46−import Rel8.Schema.Spec ( Spec(..) )
39+import Rel8.Schema.Spec ( Spec( Spec ), SSpec(..) )
47
40
48-- semigroupoids
41-- semigroupoids
49import Data.Functor.Apply ( Apply )
42import Data.Functor.Apply ( Apply )
43+import Rel8.Schema.HTable.MapTable
44+import Rel8.FCF
45+import GHC.Generics (Generic)
50
46
51
47
52type HNullify :: K.HTable -> K.HTable
48type HNullify :: K.HTable -> K.HTable
@@ -55,63 +51,58 @@ newtype HNullify table context = HNullify (HMapTable Nullify table context)
55 deriving anyclass HTable
51 deriving anyclass HTable
56
52
57
53
54+
58−-- | Transform a 'Type' by allowing it to be @null@.
55+-- | Transform a 'Spec' by allowing it to be @null@.
59−data Nullify :: Type -> Exp Type
56+data Nullify :: Spec -> Exp Spec
57+
58+
60−type instance Eval (Nullify a) = Type.Nullify a
59+type instance Eval (Nullify ('Spec labels necessity a)) =
60+ 'Spec labels necessity (Type.Nullify a)
61
61
62
62
63instance MapSpec Nullify where
63instance MapSpec Nullify where
64 mapInfo = \case
64 mapInfo = \case
65− Spec {nullity, ..} -> Spec
65+ SSpec{labels, necessity, info, nullability} -> SSpec
66− { nullity = case nullity of
66+ { labels
67− Null -> Null
67+ , necessity
68− NotNull -> Null
68+ , info
69− , ..
69+ , nullability = case nullability of
70− }
70+ Nullable -> Nullable
71−
71+ NonNullable -> Nullable
72−
72+ }
73−hguard :: HTable t
74− => (forall a. context (Maybe a) -> context (Maybe a))
75− -> HNullify t context -> HNullify t context
76−hguard guarder (HNullify as) = HNullify $ htabulate $ \(HMapTableField field) ->
77− case hfield hspecs field of
78− Spec {nullity} -> case hfield as (HMapTableField field) of
79− a -> case nullity of
80− Null -> guarder a
81− NotNull -> guarder a
82
73
83
74
84hnulls :: HTable t
75hnulls :: HTable t
85− => (forall a. Spec a -> context (Type.Nullify a))
76+ => (forall labels necessity a. ()
77+ => context ('Spec labels necessity (Maybe a)))
86 -> HNullify t context
78 -> HNullify t context
87−hnulls null = HNullify $ htabulate $ \(HMapTableField field) ->
79+hnulls null = HNullify $ htabulate $ \(HMapTableField field) -> case hfield hspecs field of
88− case hfield hspecs field of
80+ SSpec {} -> null
89− spec@Spec {} -> null spec
90{-# INLINABLE hnulls #-}
81{-# INLINABLE hnulls #-}
91
82
92
83
93hnullify :: HTable t
84hnullify :: HTable t
85+ => (forall labels necessity a. ()
86+ => SSpec ('Spec labels necessity a)
87+ -> context ('Spec labels necessity a)
94− => (forall a. Spec a -> context a -> context (Type.Nullify a))
88+ -> context ('Spec labels necessity (Type.Nullify a)))
95 -> t context
89 -> t context
96 -> HNullify t context
90 -> HNullify t context
97hnullify nullifier a = HNullify $ htabulate $ \(HMapTableField field) ->
91hnullify nullifier a = HNullify $ htabulate $ \(HMapTableField field) ->
98 case hfield hspecs field of
92 case hfield hspecs field of
99− spec@Spec {} -> nullifier spec (hfield a field)
93+ spec@SSpec {} -> nullifier spec (hfield a field)
100{-# INLINABLE hnullify #-}
94{-# INLINABLE hnullify #-}
101
95
102
96
103hunnullify :: (HTable t, Apply m)
97hunnullify :: (HTable t, Apply m)
98+ => (forall labels necessity a. ()
99+ => SSpec ('Spec labels necessity a)
104− => (forall a. Spec a -> context (Type.Nullify a) -> m (context a))
100+ -> context ('Spec labels necessity (Type.Nullify a))
101+ -> m (context ('Spec labels necessity a)))
105 -> HNullify t context
102 -> HNullify t context
106 -> m (t context)
103 -> m (t context)
107hunnullify unnullifier (HNullify as) =
104hunnullify unnullifier (HNullify as) =
108 htabulateA $ \field -> case hfield hspecs field of
105 htabulateA $ \field -> case hfield hspecs field of
109− spec@Spec {} -> case hfield as (HMapTableField field) of
106+ spec@SSpec {} -> case hfield as (HMapTableField field) of
110 a -> unnullifier spec a
107 a -> unnullifier spec a
111{-# INLINABLE hunnullify #-}
108{-# INLINABLE hunnullify #-}
112−
113−
114−hproject :: ()
115− => (forall ctx. t ctx -> t' ctx)
116− -> HNullify t context -> HNullify t' context
117−hproject f (HNullify a) = HNullify (HMapTable.hproject f a)
src/Rel8/Schema/HTable/Pair.hsnew file+20
@@ -0,0 +1,20 @@
1+{-# language DataKinds #-}
2+{-# language StandaloneKindSignatures #-}
3+
4+module Rel8.Schema.HTable.Pair
5+ ( HPair(..)
6+ )
7+where
8+
9+-- base
10+import Prelude ()
11+
12+-- rel8
13+import qualified Rel8.Schema.Kind as K
14+
15+
16+type HPair :: K.HTable -> K.HTable -> K.HTable
17+data HPair fst snd context = HPair
18+ { hfst :: fst context
19+ , hsnd :: snd context
20+ }
src/Rel8/Schema/HTable/Product.hsdeleted−17
@@ -1,17 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language StandaloneKindSignatures #-}
3−
4−module Rel8.Schema.HTable.Product
5− ( HProduct(..)
6− )
7−where
8−
9−-- base
10−import Prelude ()
11−
12−-- rel8
13−import qualified Rel8.Schema.Kind as K
14−
15−
16−type HProduct :: K.HTable -> K.HTable -> K.HTable
17−data HProduct a b context = HProduct (a context) (b context)
src/Rel8/Schema/HTable/Quartet.hsnew file+29
@@ -0,0 +1,29 @@
1+{-# language DataKinds #-}
2+{-# language DeriveAnyClass #-}
3+{-# language DeriveGeneric #-}
4+{-# language DerivingStrategies #-}
5+{-# language StandaloneKindSignatures #-}
6+
7+module Rel8.Schema.HTable.Quartet
8+ ( HQuartet(..)
9+ )
10+where
11+
12+-- base
13+import GHC.Generics ( Generic )
14+import Prelude ()
15+
16+-- rel8
17+import Rel8.Schema.HTable ( HTable )
18+import qualified Rel8.Schema.Kind as K
19+
20+
21+type HQuartet :: K.HTable -> K.HTable -> K.HTable -> K.HTable -> K.HTable
22+data HQuartet w x y z context = HQuartet
23+ { hfst :: w context
24+ , hsnd :: x context
25+ , htrd :: y context
26+ , hfrt :: z context
27+ }
28+ deriving stock Generic
29+ deriving anyclass HTable
src/Rel8/Schema/HTable/Quintet.hsnew file+30
@@ -0,0 +1,30 @@
1+{-# language DataKinds #-}
2+{-# language DeriveAnyClass #-}
3+{-# language DeriveGeneric #-}
4+{-# language DerivingStrategies #-}
5+{-# language StandaloneKindSignatures #-}
6+
7+module Rel8.Schema.HTable.Quintet
8+ ( HQuintet(..)
9+ )
10+where
11+
12+-- base
13+import GHC.Generics ( Generic )
14+import Prelude ()
15+
16+-- rel8
17+import Rel8.Schema.HTable ( HTable )
18+import qualified Rel8.Schema.Kind as K
19+
20+
21+type HQuintet :: K.HTable -> K.HTable -> K.HTable -> K.HTable -> K.HTable -> K.HTable
22+data HQuintet v w x y z context = HQuintet
23+ { hfst :: v context
24+ , hsnd :: w context
25+ , htrd :: x context
26+ , hfrt :: y context
27+ , hfft :: z context
28+ }
29+ deriving stock Generic
30+ deriving anyclass HTable
src/Rel8/Schema/HTable/These.hs+6−5
@@ -14,20 +14,21 @@ import GHC.Generics ( Generic )
14import Prelude
14import Prelude
15
15
16-- rel8
16-- rel8
17+import Rel8.Kind.Necessity ( Necessity( Required ) )
17import Rel8.Schema.HTable ( HTable )
18import Rel8.Schema.HTable ( HTable )
18import Rel8.Schema.HTable.Identity ( HIdentity )
19import Rel8.Schema.HTable.Identity ( HIdentity )
19−import Rel8.Schema.HTable.Label ( HLabel )
20import Rel8.Schema.HTable.Nullify ( HNullify )
20import Rel8.Schema.HTable.Nullify ( HNullify )
21import qualified Rel8.Schema.Kind as K
21import qualified Rel8.Schema.Kind as K
22+import Rel8.Schema.Spec ( Spec( Spec ) )
22import Rel8.Type.Tag ( MaybeTag )
23import Rel8.Type.Tag ( MaybeTag )
23
24
24
25
25type HTheseTable :: K.HTable -> K.HTable -> K.HTable
26type HTheseTable :: K.HTable -> K.HTable -> K.HTable
26data HTheseTable here there context = HTheseTable
27data HTheseTable here there context = HTheseTable
27− { hhereTag :: HLabel "hereTag" (HIdentity (Maybe MaybeTag)) context
28+ { hhereTag :: HIdentity ('Spec '["hasHere"] 'Required (Maybe MaybeTag)) context
28− , hhere :: HLabel "Here" (HNullify here) context
29+ , hhere :: HNullify here context
29− , hthereTag :: HLabel "thereTag" (HIdentity (Maybe MaybeTag)) context
30+ , hthereTag :: HIdentity ('Spec '["hasThere"] 'Required (Maybe MaybeTag)) context
30− , hthere :: HLabel "There" (HNullify there) context
31+ , hthere :: HNullify there context
31 }
32 }
32 deriving stock Generic
33 deriving stock Generic
33 deriving anyclass HTable
34 deriving anyclass HTable
src/Rel8/Schema/HTable/Trio.hsnew file+28
@@ -0,0 +1,28 @@
1+{-# language DataKinds #-}
2+{-# language DeriveAnyClass #-}
3+{-# language DeriveGeneric #-}
4+{-# language DerivingStrategies #-}
5+{-# language StandaloneKindSignatures #-}
6+
7+module Rel8.Schema.HTable.Trio
8+ ( HTrio(..)
9+ )
10+where
11+
12+-- base
13+import GHC.Generics ( Generic )
14+import Prelude ()
15+
16+-- rel8
17+import Rel8.Schema.HTable ( HTable )
18+import qualified Rel8.Schema.Kind as K
19+
20+
21+type HTrio :: K.HTable -> K.HTable -> K.HTable -> K.HTable
22+data HTrio x y z context = HTrio
23+ { hfst :: x context
24+ , hsnd :: y context
25+ , htrd :: z context
26+ }
27+ deriving stock Generic
28+ deriving anyclass HTable
src/Rel8/Schema/HTable/Type.hsnew file+61
@@ -0,0 +1,61 @@
1+{-# language DataKinds #-}
2+{-# language GADTs #-}
3+{-# language StandaloneKindSignatures #-}
4+{-# language TypeFamilies #-}
5+{-# language UndecidableInstances #-}
6+
7+module Rel8.Schema.HTable.Type
8+ ( HType(..)
9+ )
10+where
11+
12+-- base
13+import Data.Kind ( Type )
14+import Data.Proxy ( Proxy( Proxy ) )
15+import Prelude
16+
17+-- rel8
18+import Rel8.Kind.Labels ( SLabels( SLabel ) )
19+import Rel8.Kind.Necessity ( Necessity( Required ), SNecessity( SRequired ) )
20+import Rel8.Schema.Dict ( Dict( Dict ) )
21+import Rel8.Schema.HTable
22+ ( HTable, HConstrainTable, HField
23+ , hfield, htabulate, htraverse, hdicts, hspecs
24+ )
25+import qualified Rel8.Schema.Kind as K
26+import Rel8.Schema.Nullability ( Sql, nullabilization )
27+import Rel8.Schema.Spec ( Spec( Spec ), SSpec(..) )
28+import Rel8.Type ( DBType, typeInformation )
29+
30+
31+type HType :: Type -> K.HTable
32+newtype HType a context = HType
33+ { unHType :: context ('Spec '[""] 'Required a)
34+ }
35+
36+
37+type HTypeField :: Type -> Spec -> Type
38+data HTypeField a spec where
39+ HTypeField :: HTypeField a ('Spec '[""] 'Required a)
40+
41+
42+instance Sql DBType a => HTable (HType a) where
43+ type HConstrainTable (HType a) c = c ('Spec '[""] 'Required a)
44+ type HField (HType a) = HTypeField a
45+
46+ hfield (HType a) HTypeField = a
47+ htabulate f = HType $ f HTypeField
48+ htraverse f (HType a) = HType <$> f a
49+ hdicts = HType Dict
50+ hspecs = HType SSpec
51+ { labels = SLabel Proxy
52+ , necessity = SRequired
53+ , info = typeInformation
54+ , nullability = nullabilization
55+ }
56+
57+ {-# INLINABLE hfield #-}
58+ {-# INLINABLE htabulate #-}
59+ {-# INLINABLE htraverse #-}
60+ {-# INLINABLE hdicts #-}
61+ {-# INLINABLE hspecs #-}
src/Rel8/Schema/HTable/Vectorize.hs+67−45
@@ -1,63 +1,67 @@
1+{-# LANGUAGE DeriveAnyClass #-}
2+{-# LANGUAGE DeriveGeneric #-}
3+{-# LANGUAGE DerivingStrategies #-}
4+{-# LANGUAGE LambdaCase #-}
1{-# language AllowAmbiguousTypes #-}
5{-# language AllowAmbiguousTypes #-}
2{-# language ConstraintKinds #-}
6{-# language ConstraintKinds #-}
3{-# language DataKinds #-}
7{-# language DataKinds #-}
4−{-# language DeriveAnyClass #-}
5−{-# language DeriveGeneric #-}
6−{-# language DerivingStrategies #-}
7{-# language FlexibleContexts #-}
8{-# language FlexibleContexts #-}
8{-# language FlexibleInstances #-}
9{-# language FlexibleInstances #-}
9{-# language GADTs #-}
10{-# language GADTs #-}
10−{-# language LambdaCase #-}
11+{-# language InstanceSigs #-}
11{-# language MultiParamTypeClasses #-}
12{-# language MultiParamTypeClasses #-}
13+{-# language NamedFieldPuns #-}
14+{-# language QuantifiedConstraints #-}
12{-# language RankNTypes #-}
15{-# language RankNTypes #-}
13{-# language RecordWildCards #-}
16{-# language RecordWildCards #-}
14{-# language ScopedTypeVariables #-}
17{-# language ScopedTypeVariables #-}
15{-# language StandaloneKindSignatures #-}
18{-# language StandaloneKindSignatures #-}
16{-# language TypeApplications #-}
19{-# language TypeApplications #-}
17{-# language TypeFamilies #-}
20{-# language TypeFamilies #-}
21+{-# language TypeOperators #-}
18{-# language UndecidableInstances #-}
22{-# language UndecidableInstances #-}
19
23
20module Rel8.Schema.HTable.Vectorize
24module Rel8.Schema.HTable.Vectorize
21 ( HVectorize
25 ( HVectorize
22 , hvectorize, hunvectorize
26 , hvectorize, hunvectorize
23 , happend, hempty
27 , happend, hempty
24− , hproject
28+ , hrelabel
25− , hcolumn
26 )
29 )
27where
30where
28
31
29-- base
32-- base
30−import Data.Kind ( Constraint, Type )
33+import Data.Kind ( Type )
31import Data.List.NonEmpty ( NonEmpty )
34import Data.List.NonEmpty ( NonEmpty )
32−import GHC.Generics (Generic)
33import Prelude
35import Prelude
34
36
35-- rel8
37-- rel8
36−import Rel8.FCF ( Eval, Exp )
38+import Rel8.Schema.Context.Label ( HLabelable, hlabeler, hunlabeler )
37import Rel8.Schema.Dict ( Dict( Dict ) )
39import Rel8.Schema.Dict ( Dict( Dict ) )
38import qualified Rel8.Schema.Kind as K
40import qualified Rel8.Schema.Kind as K
41+import Rel8.Schema.HTable
42+ ( HTable
39−import Rel8.Schema.HTable ( HTable, hfield, htabulate, htabulateA, hspecs )
43+ , hfield, htabulate, htabulateA, hspecs
40−import Rel8.Schema.HTable.Identity ( HIdentity( HIdentity ) )
44+ )
41−import Rel8.Schema.HTable.MapTable
45+import Rel8.Schema.Nullability
42− ( HMapTable( HMapTable ), HMapTableField( HMapTableField )
46+ ( Unnullify
43− , MapSpec, mapInfo
47+ , NotNull
44− , Precompose( Precompose )
48+ , Nullability( NonNullable )
45 )
49 )
46−import qualified Rel8.Schema.HTable.MapTable as HMapTable ( hproject )
50+import Rel8.Schema.Spec ( Spec( Spec ), SSpec(..) )
47−import Rel8.Schema.Null ( Unnullify, NotNull, Nullity( NotNull ) )
48−import Rel8.Schema.Spec ( Spec(..) )
49import Rel8.Type.Array ( listTypeInformation, nonEmptyTypeInformation )
51import Rel8.Type.Array ( listTypeInformation, nonEmptyTypeInformation )
50import Rel8.Type.Information ( TypeInformation )
52import Rel8.Type.Information ( TypeInformation )
51
53
52-- semialign
54-- semialign
53−import Data.Zip ( Unzip, Zip, Zippy(..) )
55+import Data.Zip ( Unzip, Repeat, Zippy(..) )
56+import Rel8.FCF
57+import Rel8.Schema.HTable.MapTable
58+import GHC.Generics (Generic)
54
59
55
60
56−type Vector :: (Type -> Type) -> Constraint
57class Vector list where
61class Vector list where
58 listNotNull :: proxy a -> Dict NotNull (list a)
62 listNotNull :: proxy a -> Dict NotNull (list a)
59 vectorTypeInformation :: ()
63 vectorTypeInformation :: ()
60− => Nullity a
64+ => Nullability a
61 -> TypeInformation (Unnullify a)
65 -> TypeInformation (Unnullify a)
62 -> TypeInformation (list a)
66 -> TypeInformation (list a)
63
67
@@ -78,66 +82,84 @@ newtype HVectorize list table context = HVectorize (HMapTable (Vectorize list) t
78 deriving anyclass HTable
82 deriving anyclass HTable
79
83
80
84
81−data Vectorize :: (Type -> Type) -> Type -> Exp Type
85+data Vectorize :: (Type -> Type) -> Spec -> Exp Spec
82
86
83
87
84−type instance Eval (Vectorize list a) = list a
88+type instance Eval (Vectorize list ('Spec labels necessity a)) = 'Spec labels necessity (list a)
85
89
86
90
87instance Vector list => MapSpec (Vectorize list) where
91instance Vector list => MapSpec (Vectorize list) where
88 mapInfo = \case
92 mapInfo = \case
89− Spec {..} -> case listNotNull @list nullity of
93+ SSpec {..} -> case listNotNull @list nullability of
90− Dict -> Spec
94+ Dict -> SSpec
91− { nullity = NotNull
95+ { nullability = NonNullable
92− , info = vectorTypeInformation nullity info
96+ , info = vectorTypeInformation nullability info
93 , ..
97 , ..
94 }
98 }
95
99
96
100
97hvectorize :: (HTable t, Unzip f, Vector list)
101hvectorize :: (HTable t, Unzip f, Vector list)
98− => (forall a. Spec a -> f (context a) -> context' (list a))
102+ => (forall labels necessity a. ()
103+ => SSpec ('Spec labels necessity a)
104+ -> f (context ('Spec labels necessity a))
105+ -> context' ('Spec labels necessity (list a)))
99 -> f (t context)
106 -> f (t context)
100 -> HVectorize list t context'
107 -> HVectorize list t context'
101hvectorize vectorizer as = HVectorize $ htabulate $ \(HMapTableField field) ->
108hvectorize vectorizer as = HVectorize $ htabulate $ \(HMapTableField field) ->
102 case hfield hspecs field of
109 case hfield hspecs field of
103− spec -> vectorizer spec (fmap (`hfield` field) as)
110+ spec@SSpec {} -> vectorizer spec (fmap (`hfield` field) as)
104{-# INLINABLE hvectorize #-}
111{-# INLINABLE hvectorize #-}
105
112
106
113
107−hunvectorize :: (HTable t, Zip f, Vector list)
114+hunvectorize :: (HTable t, Repeat f, Vector list)
108− => (forall a. Spec a -> context (list a) -> f (context' a))
115+ => (forall labels necessity a. ()
116+ => SSpec ('Spec labels necessity a)
117+ -> context ('Spec labels necessity (list a))
118+ -> f (context' ('Spec labels necessity a)))
109 -> HVectorize list t context
119 -> HVectorize list t context
110 -> f (t context')
120 -> f (t context')
111hunvectorize unvectorizer (HVectorize table) =
121hunvectorize unvectorizer (HVectorize table) =
112 getZippy $ htabulateA $ \field -> case hfield hspecs field of
122 getZippy $ htabulateA $ \field -> case hfield hspecs field of
113− spec -> case hfield table (HMapTableField field) of
123+ spec@SSpec{} -> case hfield table (HMapTableField field) of
114 a -> Zippy (unvectorizer spec a)
124 a -> Zippy (unvectorizer spec a)
115{-# INLINABLE hunvectorize #-}
125{-# INLINABLE hunvectorize #-}
116
126
117
127
118−happend :: (HTable t, Vector list)
128+happend :: (HTable t, Vector list) =>
119− => (forall a. Spec a -> context (list a) -> context (list a) -> context (list a))
129+ ( forall labels necessity a. ()
130+ => Nullability a
131+ -> TypeInformation (Unnullify a)
132+ -> context ('Spec labels necessity (list a))
133+ -> context ('Spec labels necessity (list a))
134+ -> context ('Spec labels necessity (list a))
135+ )
120 -> HVectorize list t context
136 -> HVectorize list t context
121 -> HVectorize list t context
137 -> HVectorize list t context
122 -> HVectorize list t context
138 -> HVectorize list t context
123happend append (HVectorize as) (HVectorize bs) = HVectorize $
139happend append (HVectorize as) (HVectorize bs) = HVectorize $
124 htabulate $ \field@(HMapTableField j) -> case (hfield as field, hfield bs field) of
140 htabulate $ \field@(HMapTableField j) -> case (hfield as field, hfield bs field) of
125 (a, b) -> case hfield hspecs j of
141 (a, b) -> case hfield hspecs j of
126− spec -> append spec a b
142+ SSpec {nullability, info} -> append nullability info a b
127
143
128
144
129−hempty :: HTable t
145+hempty :: HTable t =>
130− => (forall a. Spec a -> context [a])
146+ ( forall labels necessity a. ()
147+ => Nullability a
148+ -> TypeInformation (Unnullify a)
149+ -> context ('Spec labels necessity [a])
150+ )
131 -> HVectorize [] t context
151 -> HVectorize [] t context
132−hempty empty = HVectorize $ htabulate $ \(HMapTableField field) ->
152+hempty empty = HVectorize $ htabulate $ \(HMapTableField field) -> case hfield hspecs field of
133− empty (hfield hspecs field)
153+ SSpec {nullability, info} -> empty nullability info
134
154
135
155
136−hproject :: ()
156+instance HLabelable g => HLabelable (Precompose (Vectorize list) g) where
137− => (forall ctx. t ctx -> t' ctx)
157+ hlabeler = Precompose . hlabeler . precomposed
138− -> HVectorize list t context -> HVectorize list t' context
158+ hunlabeler = Precompose . hunlabeler . precomposed
139−hproject f (HVectorize a) = HVectorize (HMapTable.hproject f a)
140
159
141
160
142−hcolumn :: HVectorize list (HIdentity a) context -> context (list a)
161+hrelabel :: HLabelable context
143−hcolumn (HVectorize (HMapTable (HIdentity (Precompose a)))) = a
162+ => (forall ctx. HLabelable ctx => t ctx -> u ctx)
163+ -> HVectorize list t context
164+ -> HVectorize list u context
165+hrelabel f (HVectorize (HMapTable table)) = HVectorize (HMapTable (f table))
src/Rel8/Schema/Insert.hsnew file+164
@@ -0,0 +1,164 @@
1+{-# language DataKinds #-}
2+{-# language DuplicateRecordFields #-}
3+{-# language FlexibleContexts #-}
4+{-# language FlexibleInstances #-}
5+{-# language GADTs #-}
6+{-# language LambdaCase #-}
7+{-# language MultiParamTypeClasses #-}
8+{-# language NamedFieldPuns #-}
9+{-# language ScopedTypeVariables #-}
10+{-# language StandaloneKindSignatures #-}
11+{-# language TypeApplications #-}
12+{-# language TypeFamilies #-}
13+{-# language UndecidableInstances #-}
14+{-# language UndecidableSuperClasses #-}
15+
16+module Rel8.Schema.Insert
17+ ( Insert(..)
18+ , OnConflict(..)
19+ , Col( RequiredInsert, OptionalInsert )
20+ , Insertion(..)
21+ , Inserts
22+ )
23+where
24+
25+-- base
26+import Data.Functor.Identity ( Identity )
27+import Data.Kind ( Constraint, Type )
28+import Prelude
29+
30+-- rel8
31+import Rel8.Aggregate ( Aggregate )
32+import Rel8.Expr ( Expr )
33+import Rel8.Kind.Necessity ( Necessity(Optional, Required) )
34+import Rel8.Opaque ( Opaque )
35+import Rel8.Schema.Context ( Interpretation(..) )
36+import Rel8.Schema.Context.Label ( Labelable(..) )
37+import Rel8.Schema.Context.Nullify
38+ ( Nullifiable, encodeTag, decodeTag, nullifier, unnullifier
39+ , runTag, unnull
40+ )
41+import Rel8.Schema.HTable.Type ( HType(HType) )
42+import qualified Rel8.Schema.Kind as K
43+import Rel8.Schema.Name ( Name, Selects )
44+import Rel8.Schema.Nullability ( Sql )
45+import Rel8.Schema.Spec ( SSpec(SSpec, nullability), Spec(Spec) )
46+import Rel8.Schema.Table ( TableSchema )
47+import Rel8.Statement.Returning ( Returning )
48+import Rel8.Table ( Table(..) )
49+import Rel8.Table.Recontextualize ( Recontextualize )
50+import Rel8.Table.Tag ( Tag(..), fromExpr )
51+import Rel8.Type ( DBType )
52+
53+
54+-- | @OnConflict@ allows you to add an @ON CONFLICT@ clause to an @INSERT@
55+-- statement.
56+data OnConflict
57+ = Abort -- ^ @ON CONFLICT ABORT@
58+ | DoNothing -- ^ @ON CONFLICT DO NOTHING@
59+
60+
61+-- | The constituent parts of a SQL @INSERT@ statement.
62+type Insert :: K.Context
63+data Insert a where
64+ Insert :: (Selects names exprs, Inserts exprs inserts) =>
65+ { into :: TableSchema names
66+ -- ^ Which table to insert into.
67+ , rows :: [inserts]
68+ -- ^ The rows to insert.
69+ , onConflict :: OnConflict
70+ -- ^ What to do if the inserted rows conflict with data already in the
71+ -- table.
72+ , returning :: Returning names a
73+ -- ^ What information to return on completion.
74+ }
75+ -> Insert a
76+
77+
78+instance Interpretation Insert where
79+ data Col Insert _spec where
80+ RequiredInsert :: Expr a -> Col Insert ('Spec labels 'Required a)
81+ OptionalInsert :: Maybe (Expr a) -> Col Insert ('Spec labels 'Optional a)
82+
83+
84+type Insertion :: K.Context
85+newtype Insertion a = Insertion (Expr a)
86+
87+
88+instance Sql DBType a => Table Insert (Insertion a) where
89+ type Columns (Insertion a) = HType a
90+ type Context (Insertion a) = Insert
91+
92+ toColumns (Insertion a) = HType (RequiredInsert a)
93+ fromColumns (HType (RequiredInsert a)) = Insertion a
94+
95+
96+instance Sql DBType a =>
97+ Recontextualize Aggregate Insert (Aggregate (Expr a)) (Insertion a)
98+
99+
100+instance Sql DBType a => Recontextualize Expr Insert (Expr a) (Insertion a)
101+
102+
103+instance Sql DBType a =>
104+ Recontextualize Identity Insert (Identity a) (Insertion a)
105+
106+
107+instance Sql DBType a =>
108+ Recontextualize Insert Aggregate (Insertion a) (Aggregate (Expr a))
109+
110+
111+instance Sql DBType a => Recontextualize Insert Expr (Insertion a) (Expr a)
112+
113+
114+instance Sql DBType a =>
115+ Recontextualize Insert Identity (Insertion a) (Identity a)
116+
117+
118+instance Sql DBType a => Recontextualize Insert Insert (Insertion a) (Insertion a)
119+
120+
121+instance Sql DBType a => Recontextualize Insert Name (Insertion a) (Name a)
122+
123+
124+instance Sql DBType a => Recontextualize Name Insert (Name a) (Insertion a)
125+
126+
127+instance Labelable Insert where
128+ labeler = \case
129+ RequiredInsert a -> RequiredInsert a
130+ OptionalInsert ma -> OptionalInsert ma
131+
132+ unlabeler = \case
133+ RequiredInsert a -> RequiredInsert a
134+ OptionalInsert ma -> OptionalInsert ma
135+
136+
137+instance Nullifiable Insert where
138+ encodeTag = RequiredInsert . expr
139+ decodeTag (RequiredInsert a) = fromExpr a
140+
141+ nullifier Tag {expr} test SSpec {nullability} = \case
142+ RequiredInsert a ->
143+ RequiredInsert $ runTag nullability condition a
144+ OptionalInsert ma ->
145+ OptionalInsert $ runTag nullability condition <$> ma
146+ where
147+ condition = test expr
148+
149+ unnullifier SSpec {nullability} = \case
150+ RequiredInsert a -> RequiredInsert $ unnull nullability a
151+ OptionalInsert ma -> OptionalInsert $ unnull nullability <$> ma
152+
153+ {-# INLINABLE encodeTag #-}
154+ {-# INLINABLE decodeTag #-}
155+ {-# INLINABLE nullifier #-}
156+ {-# INLINABLE unnullifier #-}
157+
158+
159+-- | @Inserts a b@ means that the columns in @a@ are compatible for inserting
160+-- with the table @b@.
161+type Inserts :: Type -> Type -> Constraint
162+class Recontextualize Expr Insert exprs inserts => Inserts exprs inserts
163+instance Recontextualize Expr Insert exprs inserts => Inserts exprs inserts
164+instance {-# OVERLAPPING #-} Inserts (Opaque Expr Opaque) (Opaque Insert Opaque)
src/Rel8/Schema/Kind.hs+14−8
@@ -1,9 +1,8 @@
1{-# language StandaloneKindSignatures #-}
1{-# language StandaloneKindSignatures #-}
2
2
3module Rel8.Schema.Kind
3module Rel8.Schema.Kind
4− ( Rel8able
5− , Context
4+ ( Context, Table
6− , HTable
5+ , HContext, HTable
7 )
6 )
8where
7where
9
8
@@ -11,14 +10,21 @@ where
11import Data.Kind ( Type )
10import Data.Kind ( Type )
12import Prelude ()
11import Prelude ()
13
12
13+-- rel8
14+import Rel8.Schema.Spec ( Spec )
14
15
16+
15−type Context :: Type
17+type HContext :: Type
16−type Context = Type -> Type
18+type HContext = Spec -> Type
17
19
18
20
19type HTable :: Type
21type HTable :: Type
22+type HTable = HContext -> Type
23+
24+
25+type Context :: Type
20−type HTable = Context -> Type
26+type Context = Type -> Type
21
27
22
28
23−type Rel8able :: Type
29+type Table :: Type
24−type Rel8able = Context -> Type
30+type Table = Context -> Type
src/Rel8/Schema/Name.hs+43−32
@@ -2,45 +2,39 @@
2{-# language DerivingStrategies #-}
2{-# language DerivingStrategies #-}
3{-# language FlexibleContexts #-}
3{-# language FlexibleContexts #-}
4{-# language FlexibleInstances #-}
4{-# language FlexibleInstances #-}
5−{-# language GADTs #-}
6{-# language GeneralizedNewtypeDeriving #-}
5{-# language GeneralizedNewtypeDeriving #-}
7{-# language MultiParamTypeClasses #-}
6{-# language MultiParamTypeClasses #-}
8{-# language RankNTypes #-}
7{-# language RankNTypes #-}
8+{-# language ScopedTypeVariables #-}
9{-# language StandaloneKindSignatures #-}
9{-# language StandaloneKindSignatures #-}
10+{-# language TypeApplications #-}
10{-# language TypeFamilies #-}
11{-# language TypeFamilies #-}
11{-# language UndecidableInstances #-}
12{-# language UndecidableInstances #-}
13+{-# language UndecidableSuperClasses #-}
12
14
13module Rel8.Schema.Name
15module Rel8.Schema.Name
14 ( Name(..)
16 ( Name(..)
17+ , Col( NameCol )
15 , Selects
18 , Selects
16− , ppColumn
17 )
19 )
18where
20where
19
21
20-- base
22-- base
21−import Data.Functor.Identity ( Identity( Identity ) )
23+import Data.Functor.Identity ( Identity )
22import Data.Kind ( Constraint, Type )
24import Data.Kind ( Constraint, Type )
23import Data.String ( IsString )
25import Data.String ( IsString )
24import Prelude
26import Prelude
25
27
26−-- opaleye
27−import qualified Opaleye.Internal.HaskellDB.Sql as Opaleye
28−import qualified Opaleye.Internal.HaskellDB.Sql.Print as Opaleye
29−
30−-- pretty
31−import Text.PrettyPrint ( Doc )
32−
33-- rel8
28-- rel8
34import Rel8.Expr ( Expr )
29import Rel8.Expr ( Expr )
30+import Rel8.Opaque ( Opaque )
31+import Rel8.Schema.Context ( Interpretation, Col )
32+import Rel8.Schema.Context.Label ( Labelable, labeler, unlabeler )
33+import Rel8.Schema.HTable.Type ( HType( HType ) )
35import qualified Rel8.Schema.Kind as K
34import qualified Rel8.Schema.Kind as K
36−import Rel8.Schema.HTable.Identity ( HIdentity( HIdentity ) )
35+import Rel8.Schema.Nullability ( Sql )
37−import Rel8.Schema.Null ( Sql )
38−import Rel8.Table
39− ( Table, Columns, Context, fromColumns, toColumns
36+import Rel8.Table ( Table, Columns, Context, fromColumns, toColumns )
40− , FromExprs, fromResult, toResult
37+import Rel8.Table.Recontextualize ( Recontextualize )
41− , Transpose
42− )
43−import Rel8.Table.Transpose ( Transposes )
44import Rel8.Type ( DBType )
38import Rel8.Type ( DBType )
45
39
46
40
@@ -51,27 +45,44 @@ import Rel8.Type ( DBType )
51type Name :: K.Context
45type Name :: K.Context
52newtype Name a = Name String
46newtype Name a = Name String
53 deriving stock Show
47 deriving stock Show
54− deriving newtype IsString
48+ deriving newtype (IsString, Monoid, Semigroup)
55
49
56
50
57instance Sql DBType a => Table Name (Name a) where
51instance Sql DBType a => Table Name (Name a) where
58− type Columns (Name a) = HIdentity a
52+ type Columns (Name a) = HType a
59 type Context (Name a) = Name
53 type Context (Name a) = Name
60− type FromExprs (Name a) = a
61− type Transpose to (Name a) = to a
62
54
63− toColumns a = HIdentity a
55+ toColumns (Name a) = HType (NameCol a)
64− fromColumns (HIdentity a) = a
56+ fromColumns (HType (NameCol a)) = Name a
65− toResult a = HIdentity (Identity a)
57+
66− fromResult (HIdentity (Identity a)) = a
58+
59+instance Sql DBType a => Recontextualize Expr Name (Expr a) (Name a)
60+
61+
62+instance Sql DBType a => Recontextualize Identity Name (Identity a) (Name a)
63+
64+
65+instance Sql DBType a => Recontextualize Name Expr (Name a) (Expr a)
66+
67+
68+instance Sql DBType a => Recontextualize Name Identity (Name a) (Identity a)
69+
70+
71+instance Sql DBType a => Recontextualize Name Name (Name a) (Name a)
72+
73+
74+instance Interpretation Name where
75+ newtype Col Name _spec = NameCol String
76+
77+
78+instance Labelable Name where
79+ labeler (NameCol a) = NameCol a
80+ unlabeler (NameCol a) = NameCol a
67
81
68
82
69-- | @Selects a b@ means that @a@ is a schema (i.e., a 'Table' of 'Name's) for
83-- | @Selects a b@ means that @a@ is a schema (i.e., a 'Table' of 'Name's) for
70-- the 'Expr' columns in @b@.
84-- the 'Expr' columns in @b@.
71type Selects :: Type -> Type -> Constraint
85type Selects :: Type -> Type -> Constraint
72−class Transposes Name Expr names exprs => Selects names exprs
86+class Recontextualize Name Expr names exprs => Selects names exprs
73−instance Transposes Name Expr names exprs => Selects names exprs
87+instance Recontextualize Name Expr names exprs => Selects names exprs
74−
88+instance {-# OVERLAPPING #-} Selects (Opaque Name Opaque) (Opaque Expr Opaque)
75−
76−ppColumn :: String -> Doc
77−ppColumn = Opaleye.ppSqlExpr . Opaleye.ColumnSqlExpr . Opaleye.SqlColumn
src/Rel8/Schema/Null.hsdeleted−110
@@ -1,110 +0,0 @@
1−{-# language ConstraintKinds #-}
2−{-# language DataKinds #-}
3−{-# language FlexibleContexts #-}
4−{-# language FlexibleInstances #-}
5−{-# language GADTs #-}
6−{-# language MultiParamTypeClasses #-}
7−{-# language RankNTypes #-}
8−{-# language StandaloneKindSignatures #-}
9−{-# language TypeFamilies #-}
10−{-# language UndecidableInstances #-}
11−{-# language UndecidableSuperClasses #-}
12−
13−module Rel8.Schema.Null
14− ( Nullify, Unnullify
15− , NotNull
16− , Homonullable
17− , Nullity( Null, NotNull )
18− , Nullable, nullable
19− , Sql
20− )
21−where
22−
23−-- base
24−import Data.Kind ( Constraint, Type )
25−import Prelude
26−
27−
28−type IsMaybe :: Type -> Bool
29−type family IsMaybe a where
30− IsMaybe (Maybe _) = 'True
31− IsMaybe _ = 'False
32−
33−
34−type Unnullify' :: Bool -> Type -> Type
35−type family Unnullify' isMaybe ma where
36− Unnullify' 'False a = a
37− Unnullify' 'True (Maybe a) = a
38−
39−
40−type Unnullify :: Type -> Type
41−type Unnullify a = Unnullify' (IsMaybe a) a
42−
43−
44−type Nullify' :: Bool -> Type -> Type
45−type family Nullify' isMaybe a where
46− Nullify' 'False a = a
47− Nullify' 'True a = Maybe a
48−
49−
50−type Nullify :: Type -> Type
51−type Nullify a = Maybe (Unnullify a)
52−
53−
54−-- | @nullify a@ means @a@ cannot take @null@ as a value.
55−type NotNull :: Type -> Constraint
56−class (Nullable a, IsMaybe a ~ 'False) => NotNull a
57−instance (Nullable a, IsMaybe a ~ 'False) => NotNull a
58−
59−
60−-- | @Homonullable a b@ means that both @a@ and @b@ can be @null@, or neither
61−-- @a@ or @b@ can be @null@.
62−type Homonullable :: Type -> Type -> Constraint
63−class IsMaybe a ~ IsMaybe b => Homonullable a b
64−instance IsMaybe a ~ IsMaybe b => Homonullable a b
65−
66−
67−type Nullity :: Type -> Type
68−data Nullity a where
69− NotNull :: NotNull a => Nullity a
70− Null :: NotNull a => Nullity (Maybe a)
71−
72−
73−type Nullable' :: Bool -> Type -> Constraint
74−class
75− ( IsMaybe a ~ isMaybe
76− , IsMaybe (Unnullify a) ~ 'False
77− , Nullify' isMaybe (Unnullify a) ~ a
78− ) => Nullable' isMaybe a
79− where
80− nullable' :: Nullity a
81−
82−
83−instance IsMaybe a ~ 'False => Nullable' 'False a where
84− nullable' = NotNull
85−
86−
87−instance IsMaybe a ~ 'False => Nullable' 'True (Maybe a) where
88− nullable' = Null
89−
90−
91−-- | @Nullable a@ means that @rel8@ is able to check if the type @a@ is a
92−-- type that can take @null@ values or not.
93−type Nullable :: Type -> Constraint
94−class Nullable' (IsMaybe a) a => Nullable a
95−instance Nullable' (IsMaybe a) a => Nullable a
96−
97−
98−nullable :: Nullable a => Nullity a
99−nullable = nullable'
100−
101−
102−-- | The @Sql@ type class describes both null and not null database values,
103−-- constrained by a specific class.
104−--
105−-- For example, if you see @Sql DBEq a@, this means any database type that
106−-- supports equality, and @a@ can either be exactly an @a@, or it could also be
107−-- @Maybe a@.
108−type Sql :: (Type -> Constraint) -> Type -> Constraint
109−class (constraint (Unnullify a), Nullable a) => Sql constraint a
110−instance (constraint (Unnullify a), Nullable a) => Sql constraint a
src/Rel8/Schema/Nullability.hsnew file+22
@@ -0,0 +1,22 @@
1+{-# language ConstraintKinds #-}
2+{-# language FlexibleInstances #-}
3+{-# language MonoLocalBinds #-}
4+{-# language MultiParamTypeClasses #-}
5+{-# language UndecidableInstances #-}
6+
7+{-# options_ghc -fno-warn-orphans #-}
8+
9+module Rel8.Schema.Nullability
10+ ( module Rel8.Schema.Nullability.Internal
11+ )
12+where
13+
14+-- base
15+import Prelude ()
16+
17+-- rel8
18+import Rel8.Opaque ( Opaque )
19+import Rel8.Schema.Nullability.Internal
20+
21+
22+instance {-# OVERLAPPING #-} (c Opaque, Sql c Opaque) => Sql c Opaque
src/Rel8/Schema/Nullability/Internal.hsnew file+137
@@ -0,0 +1,137 @@
1+{-# language ConstraintKinds #-}
2+{-# language DataKinds #-}
3+{-# language FlexibleContexts #-}
4+{-# language FlexibleInstances #-}
5+{-# language FunctionalDependencies #-}
6+{-# language GADTs #-}
7+{-# language MultiParamTypeClasses #-}
8+{-# language RankNTypes #-}
9+{-# language QuantifiedConstraints #-}
10+{-# language StandaloneKindSignatures #-}
11+{-# language TypeFamilies #-}
12+{-# language UndecidableInstances #-}
13+{-# language UndecidableSuperClasses #-}
14+
15+module Rel8.Schema.Nullability.Internal
16+ ( Nullify, Unnullify
17+ , NotNull
18+ , Homonullable
19+ , Nullability( Nullable, NonNullable )
20+ , HasNullability, nullabilization
21+ , Sql, fromSql, mapSql, toSql
22+ )
23+where
24+
25+-- base
26+import Data.Kind ( Constraint, Type )
27+import Prelude
28+
29+-- rel8
30+import Rel8.Opaque ( Opaque )
31+import Rel8.Schema.Dict ( Dict( Dict ) )
32+
33+
34+type IsMaybe :: Type -> Bool
35+type family IsMaybe a where
36+ IsMaybe (Maybe _) = 'True
37+ IsMaybe _ = 'False
38+
39+
40+type Unnullify' :: Bool -> Type -> Type
41+type family Unnullify' isMaybe ma where
42+ Unnullify' 'False a = a
43+ Unnullify' 'True (Maybe a) = a
44+
45+
46+type Unnullify :: Type -> Type
47+type Unnullify a = Unnullify' (IsMaybe a) a
48+
49+
50+type Nullify' :: Bool -> Type -> Type
51+type family Nullify' isMaybe a where
52+ Nullify' 'False a = a
53+ Nullify' 'True a = Maybe a
54+
55+
56+type Nullify :: Type -> Type
57+type Nullify a = Maybe (Unnullify a)
58+
59+
60+type NotNull :: Type -> Constraint
61+class (HasNullability a, IsMaybe a ~ 'False) => NotNull a
62+instance (HasNullability a, IsMaybe a ~ 'False) => NotNull a
63+instance {-# OVERLAPPING #-} NotNull Opaque
64+
65+
66+type Homonullable :: Type -> Type -> Constraint
67+class IsMaybe a ~ IsMaybe b => Homonullable a b
68+instance IsMaybe a ~ IsMaybe b => Homonullable a b
69+instance {-# OVERLAPPING #-} Homonullable Opaque Opaque
70+
71+
72+type Nullability :: Type -> Type
73+data Nullability a where
74+ NonNullable :: NotNull a => Nullability a
75+ Nullable :: NotNull a => Nullability (Maybe a)
76+
77+
78+type HasNullability' :: Bool -> Type -> Constraint
79+class
80+ ( IsMaybe a ~ isMaybe
81+ , IsMaybe (Unnullify a) ~ 'False
82+ , Nullify' isMaybe (Unnullify a) ~ a
83+ ) => HasNullability' isMaybe a
84+ where
85+ nullabilization' :: Nullability a
86+
87+
88+instance IsMaybe a ~ 'False => HasNullability' 'False a where
89+ nullabilization' = NonNullable
90+
91+
92+instance IsMaybe a ~ 'False => HasNullability' 'True (Maybe a) where
93+ nullabilization' = Nullable
94+
95+
96+type HasNullability :: Type -> Constraint
97+class HasNullability' (IsMaybe a) a => HasNullability a
98+instance HasNullability' (IsMaybe a) a => HasNullability a
99+instance {-# OVERLAPPING #-} HasNullability Opaque
100+
101+
102+nullabilization :: HasNullability a => Nullability a
103+nullabilization = nullabilization'
104+
105+
106+-- | The @Sql@ type class describes both null and not null database values,
107+-- constrained by a specific class.
108+--
109+-- For example, if you see @Sql DBEq a@, this means any database type that
110+-- supports equality, and @a@ can either be exactly an @a@, or it could also be
111+-- @Maybe a@.
112+type Sql :: (Type -> Constraint) -> Type -> Constraint
113+class
114+ ( (forall c. (forall x. (constraint x => c x)) => Sql c a)
115+ , HasNullability a
116+ , constraint (Unnullify a)
117+ )
118+ => Sql constraint a
119+instance (constraint (Unnullify a), HasNullability a) => Sql constraint a
120+
121+
122+fromSql :: Dict (Sql constraint) a -> (Nullability a, Dict constraint (Unnullify a))
123+fromSql Dict = (nullabilization, Dict)
124+{-# INLINABLE fromSql #-}
125+
126+
127+mapSql :: ()
128+ => (forall x. Dict constraint x -> Dict constraint' x)
129+ -> Dict (Sql constraint) a -> Dict (Sql constraint') a
130+mapSql f dict = case fromSql dict of
131+ (nullability, dict') -> toSql nullability (f dict')
132+
133+
134+toSql :: Nullability a -> Dict constraint (Unnullify a) -> Dict (Sql constraint) a
135+toSql NonNullable Dict = Dict
136+toSql Nullable Dict = Dict
137+{-# INLINABLE toSql #-}
src/Rel8/Schema/Result.hsdeleted−54
@@ -1,54 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language GADTs #-}
3−{-# language NamedFieldPuns #-}
4−{-# language StandaloneKindSignatures #-}
5−{-# language TypeFamilies #-}
6−
7−module Rel8.Schema.Result
8− ( Result
9− , null, nullifier, unnullifier
10− , vectorizer, unvectorizer
11− )
12−where
13−
14−-- base
15−import Data.Functor.Identity ( Identity( Identity), runIdentity )
16−import Prelude hiding ( null )
17−
18−-- rel8
19−import Rel8.Schema.Kind ( Context )
20−import Rel8.Schema.Null ( Nullify, Nullity( Null, NotNull ) )
21−import Rel8.Schema.Spec ( Spec(..) )
22−
23−
24−-- | The @Result@ context is the context used for decoded query results.
25−--
26−-- When a query is executed against a PostgreSQL database, Rel8 parses the
27−-- returned rows, decoding each row into the @Result@ context.
28−type Result :: Context
29−type Result = Identity
30−
31−
32−null :: Result (Maybe a)
33−null = Identity Nothing
34−
35−
36−nullifier :: Spec a -> Result a -> Result (Nullify a)
37−nullifier Spec {nullity} (Identity a) = Identity $ case nullity of
38− Null -> a
39− NotNull -> Just a
40−
41−
42−unnullifier :: Spec a -> Result (Nullify a) -> Maybe (Result a)
43−unnullifier Spec {nullity} (Identity a) =
44− case nullity of
45− Null -> pure $ Identity a
46− NotNull -> Identity <$> a
47−
48−
49−vectorizer :: Functor f => Spec a -> f (Result a) -> Result (f a)
50−vectorizer _ = Identity . fmap runIdentity
51−
52−
53−unvectorizer :: Functor f => Spec a -> Result (f a) -> f (Result a)
54−unvectorizer _ (Identity results) = Identity <$> results
src/Rel8/Schema/Spec.hs+60−18
@@ -1,34 +1,76 @@
1+{-# language DataKinds #-}
1{-# language FlexibleContexts #-}
2{-# language FlexibleContexts #-}
2−{-# language MonoLocalBinds #-}
3+{-# language GADTs #-}
3{-# language StandaloneKindSignatures #-}
4{-# language StandaloneKindSignatures #-}
5+{-# language UndecidableInstances #-}
4
6
5module Rel8.Schema.Spec
7module Rel8.Schema.Spec
6− ( Spec( Spec, labels, info, nullity )
8+ ( Spec( Spec )
7− , specification
9+ , SSpec( SSpec, labels, necessity, info, nullability )
10+ , KnownSpec( specSing )
11+ , KContext, HKTable
12+ , KTable
8 )
13 )
9where
14where
10
15
11-- base
16-- base
12−import Data.Kind ( Type )
17+import Data.Kind ( Constraint, Type )
13−import Prelude
18+import Prelude ()
14
19
15-- rel8
20-- rel8
16−import Rel8.Schema.Null ( Nullity, Sql, Unnullify, nullable )
21+import Rel8.Kind.Labels ( Labels, SLabels, KnownLabels, labelsSing )
22+import Rel8.Kind.Necessity
23+ ( Necessity
24+ , SNecessity
25+ , KnownNecessity, necessitySing
26+ )
27+import Rel8.Schema.Nullability ( Nullability, Sql, Unnullify, nullabilization )
17import Rel8.Type ( DBType, typeInformation )
28import Rel8.Type ( DBType, typeInformation )
18import Rel8.Type.Information ( TypeInformation )
29import Rel8.Type.Information ( TypeInformation )
19
30
20
31
21−type Spec :: Type -> Type
32+type Spec :: Type
22−data Spec a = Spec
33+data Spec = Spec Labels Necessity Type
23− { labels :: [String]
34+
35+
36+type SSpec :: Spec -> Type
37+data SSpec spec where
38+ SSpec ::
39+ { labels :: SLabels labels
40+ , necessity :: SNecessity necessity
24− , info :: TypeInformation (Unnullify a)
41+ , info :: TypeInformation (Unnullify a)
25− , nullity :: Nullity a
42+ , nullability :: Nullability a
43+ }
44+ -> SSpec ('Spec labels necessity a)
45+
46+
47+type KnownSpec :: Spec -> Constraint
48+class KnownSpec spec where
49+ specSing :: SSpec spec
50+
51+
52+instance
53+ ( KnownLabels labels
54+ , KnownNecessity necessity
55+ , Sql DBType a
56+ )
57+ => KnownSpec ('Spec labels necessity a)
58+ where
59+ specSing = SSpec
60+ { labels = labelsSing
61+ , necessity = necessitySing
62+ , info = typeInformation
63+ , nullability = nullabilization
26− }
64+ }
65+
66+
67+type KContext :: Type
68+type KContext = Spec -> Type
69+
70+
71+type HKTable :: Type
72+type HKTable = KContext -> Type
27
73
28
74
29−specification :: Sql DBType a => Spec a
75+type KTable :: Type
30−specification = Spec
76+type KTable = (Type -> Type) -> Type
31− { labels = []
32− , info = typeInformation
33− , nullity = nullable
34− }
src/Rel8/Schema/Spec/ConstrainDBType.hsnew file+70
@@ -0,0 +1,70 @@
1+{-# language ConstraintKinds #-}
2+{-# language DataKinds #-}
3+{-# language FlexibleInstances #-}
4+{-# language MultiParamTypeClasses #-}
5+{-# language QuantifiedConstraints #-}
6+{-# language StandaloneKindSignatures #-}
7+{-# language TypeFamilies #-}
8+{-# language UndecidableInstances #-}
9+
10+module Rel8.Schema.Spec.ConstrainDBType
11+ ( ConstrainDBType
12+ , dbTypeNullability
13+ , dbTypeDict
14+ , fromNullabilityDict
15+ )
16+where
17+
18+-- base
19+import Data.Kind ( Constraint, Type )
20+import Prelude
21+
22+-- rel8
23+import Rel8.Schema.Dict ( Dict( Dict ) )
24+import Rel8.Schema.Nullability
25+ ( Unnullify
26+ , Nullability
27+ , Sql, nullabilization, toSql
28+ )
29+import Rel8.Schema.Spec ( Spec( Spec ) )
30+
31+
32+type ConstrainDBType :: (Type -> Constraint) -> Spec -> Constraint
33+class
34+ ( forall c labels necessity a. ()
35+ => (spec ~ 'Spec labels necessity a)
36+ => (forall x. (constraint x => c x)) => Sql c a
37+ )
38+ => ConstrainDBType constraint spec
39+instance
40+ ( spec ~ 'Spec labels necessity a
41+ , Sql constraint a
42+ )
43+ => ConstrainDBType constraint spec
44+
45+
46+dbTypeNullability :: Dict (ConstrainDBType c) ('Spec l n a) -> Nullability a
47+dbTypeNullability = step2 . step1
48+ where
49+ step1 :: Dict (ConstrainDBType c) ('Spec l n a) -> Dict (Sql c) a
50+ step1 Dict = Dict
51+
52+ step2 :: Dict (Sql c) a -> Nullability a
53+ step2 Dict = nullabilization
54+
55+
56+dbTypeDict :: Dict (ConstrainDBType c) ('Spec l n a) -> Dict c (Unnullify a)
57+dbTypeDict = step2 . step1
58+ where
59+ step1 :: Dict (ConstrainDBType c) ('Spec l n a) -> Dict (Sql c) a
60+ step1 Dict = Dict
61+
62+ step2 :: Dict (Sql c) a -> Dict c (Unnullify a)
63+ step2 Dict = Dict
64+
65+
66+fromNullabilityDict :: Nullability a -> Dict c (Unnullify a) -> Dict (ConstrainDBType c) ('Spec l n a)
67+fromNullabilityDict nullability = step2 . toSql nullability
68+ where
69+ step2 :: Dict (Sql c) a -> Dict (ConstrainDBType c) ('Spec l n a)
70+ step2 Dict = Dict
src/Rel8/Schema/Spec/ConstrainType.hsnew file+31
@@ -0,0 +1,31 @@
1+{-# language ConstraintKinds #-}
2+{-# language DataKinds #-}
3+{-# language FlexibleInstances #-}
4+{-# language MultiParamTypeClasses #-}
5+{-# language QuantifiedConstraints #-}
6+{-# language StandaloneKindSignatures #-}
7+{-# language TypeFamilies #-}
8+{-# language UndecidableInstances #-}
9+
10+module Rel8.Schema.Spec.ConstrainType
11+ ( ConstrainType
12+ )
13+where
14+
15+-- base
16+import Data.Kind ( Constraint, Type )
17+import Prelude ()
18+
19+-- rel8
20+import Rel8.Schema.Spec ( Spec( Spec ) )
21+
22+
23+type ConstrainType :: (Type -> Constraint) -> Spec -> Constraint
24+class
25+ ( forall labels necessity a. ()
26+ => (spec ~ 'Spec labels necessity a)
27+ => constraint a
28+ ) =>
29+ ConstrainType constraint spec
30+instance (spec ~ 'Spec labels necessity a, constraint a) =>
31+ ConstrainType constraint spec
src/Rel8/Schema/Structure.hsnew file+54
@@ -0,0 +1,54 @@
1+{-# language DataKinds #-}
2+{-# language StandaloneKindSignatures #-}
3+{-# language PolyKinds #-}
4+{-# language TypeFamilies #-}
5+
6+module Rel8.Schema.Structure
7+ ( Structure
8+ , Shape( Column, Either, List, Maybe, NonEmpty, These )
9+ , Shape1
10+ , Shape2
11+ , IsStructure
12+ )
13+where
14+
15+-- base
16+import Data.Kind ( Type )
17+import Prelude
18+
19+-- rel8
20+import qualified Rel8.Schema.Kind as K
21+import Rel8.Schema.Spec ( Spec )
22+
23+
24+type Structure :: K.Context
25+data Structure a
26+
27+
28+type Shape :: Type
29+data Shape
30+ = Column Spec
31+ | Either Type Type
32+ | List Type
33+ | Maybe Type
34+ | NonEmpty Type
35+ | These Type Type
36+
37+
38+type Shape1 :: (a -> Shape) -> a -> Type
39+data Shape1 shape a
40+
41+
42+type Shape2 :: (a -> b -> Shape) -> a -> b -> Type
43+data Shape2 shape a b
44+
45+
46+type IsStructure :: Type -> Bool
47+type family IsStructure a where
48+ IsStructure (Shape1 _ _) = 'True
49+ IsStructure (Shape2 _ _ _) = 'True
50+ IsStructure (_, _) = 'True
51+ IsStructure (_, _, _) = 'True
52+ IsStructure (_, _, _, _) = 'True
53+ IsStructure (_, _, _, _, _) = 'True
54+ IsStructure _ = 'False
src/Rel8/Schema/Table.hs+14−21
@@ -1,34 +1,34 @@
1{-# language DeriveFunctor #-}
1{-# language DeriveFunctor #-}
2{-# language DerivingStrategies #-}
2{-# language DerivingStrategies #-}
3−{-# language DisambiguateRecordFields #-}
4−{-# language NamedFieldPuns #-}
5−{-# language StandaloneKindSignatures #-}
6
3
7module Rel8.Schema.Table
4module Rel8.Schema.Table
8 ( TableSchema(..)
5 ( TableSchema(..)
9− , ppTable
10 )
6 )
11where
7where
12
8
13-- base
9-- base
14−import Data.Kind ( Type )
15import Prelude
10import Prelude
16
11
17−-- opaleye
18−import qualified Opaleye.Internal.HaskellDB.Sql as Opaleye
19−import qualified Opaleye.Internal.HaskellDB.Sql.Print as Opaleye
20−
21−-- pretty
22−import Text.PrettyPrint ( Doc )
23−
24
12
25-- | The schema for a table. This is used to specify the name and schema that a
13-- | The schema for a table. This is used to specify the name and schema that a
26-- table belongs to (the @FROM@ part of a SQL query), along with the schema of
14-- table belongs to (the @FROM@ part of a SQL query), along with the schema of
27-- the columns within this table.
15-- the columns within this table.
28--
16--
29-- For each selectable table in your database, you should provide a
17-- For each selectable table in your database, you should provide a
30−-- @TableSchema@ in order to interact with the table via Rel8.
18+-- @TableSchema@ in order to interact with the table via Rel8. For a table
31−type TableSchema :: Type -> Type
19+-- storing a list of projects (as defined in the introduction):
20+--
21+-- >>> :{
22+-- projectSchema :: TableSchema (Project ColumnSchema)
23+-- projectSchema = TableSchema
24+-- { tableName = "project"
25+-- , tableSchema = Nothing -- Assumes that the 'project' table is reachable from your connection's search_path
26+-- , tableColumns = Project
27+-- { projectAuthorId = "author_id"
28+-- , projectName = "name"
29+-- }
30+-- }
31+-- :}
32data TableSchema names = TableSchema
32data TableSchema names = TableSchema
33 { name :: String
33 { name :: String
34 -- ^ The name of the table.
34 -- ^ The name of the table.
@@ -40,10 +40,3 @@ data TableSchema names = TableSchema
40 -- data type here, parameterized by the 'Rel8.ColumnSchema.ColumnSchema' functor.
40 -- data type here, parameterized by the 'Rel8.ColumnSchema.ColumnSchema' functor.
41 }
41 }
42 deriving stock Functor
42 deriving stock Functor
43−
44−
45−ppTable :: TableSchema a -> Doc
46−ppTable TableSchema {name, schema} = Opaleye.ppTable Opaleye.SqlTable
47− { sqlTableSchemaName = schema
48− , sqlTableName = name
49− }
src/Rel8/Statement/Delete.hs+66−35
@@ -1,37 +1,40 @@
1{-# language DuplicateRecordFields #-}
1{-# language DuplicateRecordFields #-}
2{-# language GADTs #-}
2{-# language GADTs #-}
3{-# language NamedFieldPuns #-}
3{-# language NamedFieldPuns #-}
4−{-# language RankNTypes #-}
4+{-# language ScopedTypeVariables #-}
5−{-# language RecordWildCards #-}
6{-# language StandaloneKindSignatures #-}
5{-# language StandaloneKindSignatures #-}
7−{-# language StrictData #-}
6+{-# language TypeApplications #-}
8
7
9module Rel8.Statement.Delete
8module Rel8.Statement.Delete
10 ( Delete(..)
9 ( Delete(..)
11 , delete
10 , delete
12− , ppDelete
13 )
11 )
14where
12where
15
13
16-- base
14-- base
15+import Control.Exception ( throwIO )
17import Data.Kind ( Type )
16import Data.Kind ( Type )
18import Prelude
17import Prelude
19
18
20-- hasql
19-- hasql
20+import Hasql.Connection ( Connection )
21+import qualified Hasql.Decoders as Hasql
21import qualified Hasql.Encoders as Hasql
22import qualified Hasql.Encoders as Hasql
23+import qualified Hasql.Session as Hasql
22import qualified Hasql.Statement as Hasql
24import qualified Hasql.Statement as Hasql
23
25
24−-- pretty
26+-- opaleye
25−import Text.PrettyPrint ( Doc, (<+>), ($$), text )
27+import qualified Opaleye.Internal.Manipulation as Opaleye
26
28
27-- rel8
29-- rel8
28import Rel8.Expr ( Expr )
30import Rel8.Expr ( Expr )
29−import Rel8.Query ( Query )
31+import Rel8.Expr.Opaleye ( toColumn, toPrimExpr )
30import Rel8.Schema.Name ( Selects )
32import Rel8.Schema.Name ( Selects )
31−import Rel8.Schema.Table ( TableSchema, ppTable )
33+import Rel8.Schema.Table ( TableSchema )
32−import Rel8.Statement.Returning ( Returning, decodeReturning, ppReturning )
34+import Rel8.Statement.Returning ( Returning( NumberOfRowsAffected, Projection ) )
33−import Rel8.Statement.Using ( ppUsing )
35+import Rel8.Table ( fromColumns, toColumns )
34−import Rel8.Statement.Where ( ppWhere )
36+import Rel8.Table.Opaleye ( table, unpackspec )
37+import Rel8.Table.Serialize ( Serializable, parse )
35
38
36-- text
39-- text
37import qualified Data.Text as Text
40import qualified Data.Text as Text
@@ -44,10 +47,7 @@ data Delete a where
44 Delete :: Selects names exprs =>
47 Delete :: Selects names exprs =>
45 { from :: TableSchema names
48 { from :: TableSchema names
46 -- ^ Which table to delete from.
49 -- ^ Which table to delete from.
47− , using :: Query using
48− -- ^ @USING@ clause — this can be used to join against other tables,
49− -- and its results can be referenced in the @WHERE@ clause
50− , deleteWhere :: using -> exprs -> Expr Bool
50+ , deleteWhere :: exprs -> Expr Bool
51 -- ^ Which rows should be selected for deletion.
51 -- ^ Which rows should be selected for deletion.
52 , returning :: Returning names a
52 , returning :: Returning names a
53 -- ^ What to return from the @DELETE@ statement.
53 -- ^ What to return from the @DELETE@ statement.
@@ -55,25 +55,56 @@ data Delete a where
55 -> Delete a
55 -> Delete a
56
56
57
57
58−ppDelete :: Delete a -> Doc
58+-- | Run a @DELETE@ statement.
59−ppDelete Delete {..} = case ppUsing using of
59+--
60− Nothing ->
60+-- >>> mapM_ print =<< select c (each projectSchema)
61− text "DELETE FROM" <+> ppTable from $$
61+-- Project {projectAuthorId = 1, projectName = "rel8"}
62− text "WHERE false"
62+-- Project {projectAuthorId = 2, projectName = "aeson"}
63− Just (usingDoc, i) ->
63+-- Project {projectAuthorId = 2, projectName = "text"}
64− text "DELETE FROM" <+> ppTable from $$
64+--
65− usingDoc $$
65+-- >>> :{
66− ppWhere from (deleteWhere i) $$
66+-- delete c Delete
67− ppReturning from returning
67+-- { from = projectSchema
68+-- , deleteWhere = \p -> projectName p ==. lit "rel8"
69+-- , returning = Projection projectName
70+-- }
71+-- :}
72+-- ["rel8"]
73+--
74+-- >>> mapM_ print =<< select c (each projectSchema)
75+-- Project {projectAuthorId = 2, projectName = "aeson"}
76+-- Project {projectAuthorId = 2, projectName = "text"}
77+delete :: Connection -> Delete a -> IO a
78+delete c Delete {from, deleteWhere, returning} =
79+ case returning of
80+ NumberOfRowsAffected -> Hasql.run session c >>= either throwIO pure
81+ where
82+ session = Hasql.statement () statement
83+ statement = Hasql.Statement bytes params decode prepare
84+ bytes = encodeUtf8 $ Text.pack sql
85+ params = Hasql.noParams
86+ decode = Hasql.rowsAffected
87+ prepare = False
88+ sql = Opaleye.arrangeDeleteSql from' where'
89+ where
90+ from' = table $ toColumns <$> from
91+ where' = toColumn . toPrimExpr . deleteWhere . fromColumns
68
92
69−
93+ Projection project -> Hasql.run session c >>= either throwIO pure
70−-- | Run a 'Delete' statement.
94+ where
71−delete :: Delete a -> Hasql.Statement () a
95+ session = Hasql.statement () statement
72−delete d@Delete {returning} = Hasql.Statement bytes params decode prepare
96+ statement = Hasql.Statement bytes params decode prepare
97+ bytes = encodeUtf8 $ Text.pack sql
98+ params = Hasql.noParams
99+ decode = decoder project
100+ prepare = False
101+ sql =
102+ Opaleye.arrangeDeleteReturningSql unpackspec from' where' project'
103+ where
104+ from' = table $ toColumns <$> from
105+ where' = toColumn . toPrimExpr . deleteWhere . fromColumns
106+ project' = toColumns . project . fromColumns
73 where
107 where
74− bytes = encodeUtf8 $ Text.pack sql
108+ decoder :: forall exprs projection a. Serializable projection a
75− params = Hasql.noParams
109+ => (exprs -> projection) -> Hasql.Result [a]
76− decode = decodeReturning returning
110+ decoder _ = Hasql.rowList (parse @projection @a)
77− prepare = False
78− sql = show doc
79− doc = ppDelete d
src/Rel8/Statement/Insert.hs+70−60
@@ -1,89 +1,99 @@
1−{-# language DuplicateRecordFields #-}
2−{-# language FlexibleContexts #-}
3{-# language GADTs #-}
1{-# language GADTs #-}
4{-# language NamedFieldPuns #-}
2{-# language NamedFieldPuns #-}
5−{-# language RecordWildCards #-}
3+{-# language ScopedTypeVariables #-}
6−{-# language StandaloneKindSignatures #-}
4+{-# language TypeApplications #-}
7−{-# language StrictData #-}
8
5
9module Rel8.Statement.Insert
6module Rel8.Statement.Insert
10 ( Insert(..)
7 ( Insert(..)
8+ , OnConflict(..)
11 , insert
9 , insert
12− , ppInsert
13− , ppInto
14 )
10 )
15where
11where
16
12
17-- base
13-- base
18−import Data.Foldable ( toList )
14+import Control.Exception ( throwIO )
19−import Data.Kind ( Type )
15+import Data.List.NonEmpty ( NonEmpty( (:|) ) )
20import Prelude
16import Prelude
21
17
22-- hasql
18-- hasql
19+import Hasql.Connection ( Connection )
20+import qualified Hasql.Decoders as Hasql
23import qualified Hasql.Encoders as Hasql
21import qualified Hasql.Encoders as Hasql
22+import qualified Hasql.Session as Hasql
24import qualified Hasql.Statement as Hasql
23import qualified Hasql.Statement as Hasql
25
24
26-- opaleye
25-- opaleye
27−import qualified Opaleye.Internal.HaskellDB.Sql.Print as Opaleye
26+import qualified Opaleye.Internal.Manipulation as Opaleye
28−
27+import qualified Opaleye.Manipulation as Opaleye
29−-- pretty
30−import Text.PrettyPrint ( Doc, (<+>), ($$), parens, text )
31
28
32-- rel8
29-- rel8
33−import Rel8.Query ( Query )
30+import Rel8.Schema.Insert ( Insert(..), OnConflict(..) )
34−import Rel8.Schema.Name ( Name, Selects, ppColumn )
31+import Rel8.Statement.Returning ( Returning( Projection, NumberOfRowsAffected ) )
35−import Rel8.Schema.Table ( TableSchema(..), ppTable )
32+import Rel8.Table ( fromColumns, toColumns )
36−import Rel8.Statement.OnConflict ( OnConflict, ppOnConflict )
37−import Rel8.Statement.Returning ( Returning, decodeReturning, ppReturning )
38−import Rel8.Statement.Select ( ppRows )
39−import Rel8.Table ( Table )
33+import Rel8.Table.Opaleye ( table, unpackspec )
40−import Rel8.Table.Name ( showNames )
34+import Rel8.Table.Serialize ( Serializable, parse )
41
35
42-- text
36-- text
43import qualified Data.Text as Text ( pack )
37import qualified Data.Text as Text ( pack )
44import Data.Text.Encoding ( encodeUtf8 )
38import Data.Text.Encoding ( encodeUtf8 )
45
39
46
40
47−-- | The constituent parts of a SQL @INSERT@ statement.
41+-- | Run an @INSERT@ statement
48−type Insert :: Type -> Type
42+--
49−data Insert a where
43+-- >>> :{
50− Insert :: Selects names exprs =>
44+-- insert c Insert
51− { into :: TableSchema names
45+-- { into = authorSchema
52− -- ^ Which table to insert into.
46+-- , rows = [ lit Author{ authorName = "Gabriel Gonzales", authorId = AuthorId 4, authorUrl = Just "https://haskellforall.com" } ]
53− , rows :: Query exprs
47+-- , onConflict = Abort
54− -- ^ The rows to insert. This can be an arbitrary query — use
48+-- , returning = NumberOfRowsAffected
55− -- 'Rel8.values' insert a static list of rows.
56− , onConflict :: OnConflict names
57− -- ^ What to do if the inserted rows conflict with data already in the
58− -- table.
59− , returning :: Returning names a
60− -- ^ What information to return on completion.
61− }
49+-- }
62− -> Insert a
50+-- :}
63−
51+-- 1
64−
52+insert :: Connection -> Insert a -> IO a
65−ppInsert :: Insert a -> Doc
53+insert c Insert {into, rows, onConflict, returning} =
66−ppInsert Insert {..} =
54+ case (rows, returning) of
67− text "INSERT INTO" <+>
55+ ([], NumberOfRowsAffected) -> pure 0
68− ppInto into $$
56+ ([], Projection _) -> pure []
69− ppRows rows $$
70− ppOnConflict into onConflict $$
71− ppReturning into returning
72
57
58+ (x:xs, NumberOfRowsAffected) -> Hasql.run session c >>= either throwIO pure
59+ where
60+ session = Hasql.statement () statement
61+ statement = Hasql.Statement bytes params decode prepare
62+ bytes = encodeUtf8 $ Text.pack sql
63+ params = Hasql.noParams
64+ decode = Hasql.rowsAffected
65+ prepare = False
66+ sql = Opaleye.arrangeInsertManySql into' rows' onConflict'
67+ where
68+ into' = table $ toColumns <$> into
69+ rows' = toColumns <$> x :| xs
73
70
74−ppInto :: Table Name a => TableSchema a -> Doc
71+ (x:xs, Projection project) -> Hasql.run session c >>= either throwIO pure
75−ppInto table@TableSchema {columns} =
72+ where
76− ppTable table <+>
73+ session = Hasql.statement () statement
77− parens (Opaleye.commaV ppColumn (toList (showNames columns)))
74+ statement = Hasql.Statement bytes params decode prepare
75+ bytes = encodeUtf8 $ Text.pack sql
76+ params = Hasql.noParams
77+ decode = decoder project
78+ prepare = False
79+ sql =
80+ Opaleye.arrangeInsertManyReturningSql
81+ unpackspec
82+ into'
83+ rows'
84+ project'
85+ onConflict'
86+ where
87+ into' = table $ toColumns <$> into
88+ rows' = toColumns <$> x :| xs
89+ project' = toColumns . project . fromColumns
78
90
79−
80−-- | Run an 'Insert' statement.
81−insert :: Insert a -> Hasql.Statement () a
82−insert i@Insert {returning} = Hasql.Statement bytes params decode prepare
83 where
91 where
84− bytes = encodeUtf8 $ Text.pack sql
92+ onConflict' =
85− params = Hasql.noParams
93+ case onConflict of
86− decode = decodeReturning returning
94+ DoNothing -> Just Opaleye.DoNothing
87− prepare = False
95+ Abort -> Nothing
88− sql = show doc
96+
89− doc = ppInsert i
97+ decoder :: forall exprs projection a. Serializable projection a
98+ => (exprs -> projection) -> Hasql.Result [a]
99+ decoder _ = Hasql.rowList (parse @projection @a)
src/Rel8/Statement/OnConflict.hsdeleted−106
@@ -1,106 +0,0 @@
1−{-# language DuplicateRecordFields #-}
2−{-# language FlexibleContexts #-}
3−{-# language GADTs #-}
4−{-# language LambdaCase #-}
5−{-# language NamedFieldPuns #-}
6−{-# language RecordWildCards #-}
7−{-# language StandaloneKindSignatures #-}
8−{-# language StrictData #-}
9−
10−module Rel8.Statement.OnConflict
11− ( OnConflict(..)
12− , Upsert(..)
13− , ppOnConflict
14− )
15−where
16−
17−-- base
18−import Data.Foldable ( toList )
19−import Data.Kind ( Type )
20−import Prelude
21−
22−-- opaleye
23−import qualified Opaleye.Internal.HaskellDB.Sql.Print as Opaleye
24−
25−-- pretty
26−import Text.PrettyPrint ( Doc, (<+>), ($$), parens, text )
27−
28−-- rel8
29−import Rel8.Expr ( Expr )
30−import Rel8.Schema.Name ( Name, Selects, ppColumn )
31−import Rel8.Schema.Table ( TableSchema(..) )
32−import Rel8.Statement.Set ( ppSet )
33−import Rel8.Statement.Where ( ppWhere )
34−import Rel8.Table ( Table, toColumns )
35−import Rel8.Table.Cols ( Cols( Cols ) )
36−import Rel8.Table.Name ( showNames )
37−import Rel8.Table.Opaleye ( attributes )
38−import Rel8.Table.Projection ( Projecting, Projection, apply )
39−
40−
41−-- | 'OnConflict' represents the @ON CONFLICT@ clause of an @INSERT@
42−-- statement. This specifies what ought to happen when one or more of the
43−-- rows proposed for insertion conflict with an existing row in the table.
44−type OnConflict :: Type -> Type
45−data OnConflict names
46− = Abort
47− -- ^ Abort the transaction if there are conflicting rows (Postgres' default)
48− | DoNothing
49− -- ^ @ON CONFLICT DO NOTHING@
50− | DoUpdate (Upsert names)
51− -- ^ @ON CONFLICT DO UPDATE@
52−
53−
54−-- | The @ON CONFLICT (...) DO UPDATE@ clause of an @INSERT@ statement, also
55−-- known as \"upsert\".
56−--
57−-- When an existing row conflicts with a row proposed for insertion,
58−-- @ON CONFLICT DO UPDATE@ allows you to instead update this existing row. The
59−-- conflicting row proposed for insertion is then \"excluded\", but its values
60−-- can still be referenced from the @SET@ and @WHERE@ clauses of the @UPDATE@
61−-- statement.
62−--
63−-- Upsert in Postgres requires an explicit set of \"conflict targets\" — the
64−-- set of columns comprising the @UNIQUE@ index from conflicts with which we
65−-- would like to recover.
66−type Upsert :: Type -> Type
67−data Upsert names where
68− Upsert :: (Selects names exprs, Projecting names index, excluded ~ exprs) =>
69− { index :: Projection names index
70− -- ^ The set of conflict targets, projected from the set of columns for
71− -- the whole table
72− , set :: excluded -> exprs -> exprs
73− -- ^ How to update each selected row.
74− , updateWhere :: excluded -> exprs -> Expr Bool
75− -- ^ Which rows to select for update.
76− }
77− -> Upsert names
78−
79−
80−ppOnConflict :: TableSchema names -> OnConflict names -> Doc
81−ppOnConflict schema = \case
82− Abort -> mempty
83− DoNothing -> text "ON CONFLICT DO NOTHING"
84− DoUpdate upsert -> ppUpsert schema upsert
85−
86−
87−ppUpsert :: TableSchema names -> Upsert names -> Doc
88−ppUpsert schema@TableSchema {columns} Upsert {..} =
89− text "ON CONFLICT" <+>
90− ppIndex schema index <+>
91− text "DO UPDATE" $$
92− ppSet schema (set excluded) $$
93− ppWhere schema (updateWhere excluded)
94− where
95− excluded = attributes TableSchema
96− { schema = Nothing
97− , name = "excluded"
98− , columns
99− }
100−
101−
102−ppIndex :: (Table Name names, Projecting names index)
103− => TableSchema names -> Projection names index -> Doc
104−ppIndex TableSchema {columns} index =
105− parens $ Opaleye.commaV ppColumn $ toList $
106− showNames $ Cols $ apply index $ toColumns columns
src/Rel8/Statement/Returning.hs+10−114
@@ -1,133 +1,29 @@
1{-# language GADTs #-}
1{-# language GADTs #-}
2−{-# language LambdaCase #-}
3−{-# language NamedFieldPuns #-}
4−{-# language RankNTypes #-}
5−{-# language ScopedTypeVariables #-}
6{-# language StandaloneKindSignatures #-}
2{-# language StandaloneKindSignatures #-}
7−{-# language StrictData #-}
8−{-# language TypeApplications #-}
9
3
10module Rel8.Statement.Returning
4module Rel8.Statement.Returning
11− ( Returning( NumberOfRowsAffected, Projection )
5+ ( Returning(..)
12− , decodeReturning
13− , ppReturning
14 )
6 )
15where
7where
16
8
17-- base
9-- base
18−import Control.Applicative ( liftA2 )
19−import Data.Foldable ( toList )
20import Data.Int ( Int64 )
10import Data.Int ( Int64 )
21import Data.Kind ( Type )
11import Data.Kind ( Type )
22−import Data.List.NonEmpty ( NonEmpty )
23−import Prelude
12+import Prelude ()
24−
25−-- hasql
26−import qualified Hasql.Decoders as Hasql
27−
28−-- opaleye
29−import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
30−import qualified Opaleye.Internal.HaskellDB.Sql.Print as Opaleye
31−import qualified Opaleye.Internal.Sql as Opaleye
32−
33−-- pretty
34−import Text.PrettyPrint ( Doc, (<+>), text )
35
13
36-- rel8
14-- rel8
37import Rel8.Schema.Name ( Selects )
15import Rel8.Schema.Name ( Selects )
38−import Rel8.Schema.Table ( TableSchema(..) )
39−import Rel8.Table.Opaleye ( castTable, exprs, view )
40−import Rel8.Table.Serialize ( Serializable, parse )
16+import Rel8.Table.Serialize ( Serializable )
41
17
42−-- semigropuoids
43−import Data.Functor.Apply ( Apply, (<.>) )
44
18
45−
46−-- | 'Rel8.Insert', 'Rel8.Update' and 'Rel8.Delete' all support returning either
19+-- | @INSERT@, @UPDATE@ and @DELETE@ all support returning either the number of
47−-- the number of rows affected, or the actual rows modified.
20+-- rows affected, or the actual rows modified. 'Projection' allows you to
21+-- project out of these returned rows, which can be useful if you want to log
22+-- exactly which rows were deleted, or to view a generated id (for example, if
23+-- using a column with an autoincrementing counter as a default value).
48type Returning :: Type -> Type -> Type
24type Returning :: Type -> Type -> Type
49data Returning names a where
25data Returning names a where
50− Pure :: a -> Returning names a
51− Ap :: Returning names (a -> b) -> Returning names a -> Returning names b
52−
53− -- | Return the number of rows affected.
54 NumberOfRowsAffected :: Returning names Int64
26 NumberOfRowsAffected :: Returning names Int64
55−
56− -- | 'Projection' allows you to project out of the affected rows, which can
57− -- be useful if you want to log exactly which rows were deleted, or to view
58− -- a generated id (for example, if using a column with an autoincrementing
59− -- counter via 'Rel8.nextval').
60− Projection :: (Selects names exprs, Serializable returning a)
27+ Projection :: (Selects names exprs, Serializable projection a)
61− => (exprs -> returning)
28+ => (exprs -> projection)
62 -> Returning names [a]
29 -> Returning names [a]
63−
64−
65−instance Functor (Returning names) where
66− fmap f = \case
67− Pure a -> Pure (f a)
68− Ap g a -> Ap (fmap (f .) g) a
69− m -> Ap (Pure f) m
70−
71−
72−instance Apply (Returning names) where
73− (<.>) = Ap
74−
75−
76−instance Applicative (Returning names) where
77− pure = Pure
78− (<*>) = Ap
79−
80−
81−projections :: ()
82− => TableSchema names -> Returning names a -> Maybe (NonEmpty Opaleye.PrimExpr)
83−projections schema@TableSchema {columns} = \case
84− Pure _ -> Nothing
85− Ap f a -> projections schema f <> projections schema a
86− NumberOfRowsAffected -> Nothing
87− Projection f -> Just (exprs (castTable (f (view columns))))
88−
89−
90−runReturning :: ()
91− => ((Int64 -> a) -> r)
92− -> (forall x. Hasql.Row x -> ([x] -> a) -> r)
93− -> Returning names a
94− -> r
95−runReturning rowCount rowList = \case
96− Pure a -> rowCount (const a)
97− Ap fs as ->
98− runReturning
99− (\withCount ->
100− runReturning
101− (\withCount' -> rowCount (withCount <*> withCount'))
102− (\decoder -> rowList decoder . liftA2 withCount length64)
103− as)
104− (\decoder withRows ->
105− runReturning
106− (\withCount -> rowList decoder $ withRows <*> withCount . length64)
107− (\decoder' withRows' ->
108− rowList (liftA2 (,) decoder decoder') $
109− withRows <$> fmap fst <*> withRows' . fmap snd)
110− as)
111− fs
112− NumberOfRowsAffected -> rowCount id
113− Projection (_ :: exprs -> returning) -> rowList decoder' id
114− where
115− decoder' = parse @returning
116− where
117− length64 :: Foldable f => f x -> Int64
118− length64 = fromIntegral . length
119−
120−
121−decodeReturning :: Returning names a -> Hasql.Result a
122−decodeReturning = runReturning
123− (<$> Hasql.rowsAffected)
124− (\decoder withRows -> withRows <$> Hasql.rowList decoder)
125−
126−
127−ppReturning :: TableSchema names -> Returning names a -> Doc
128−ppReturning schema returning = case projections schema returning of
129− Nothing -> mempty
130− Just columns ->
131− text "RETURNING" <+> Opaleye.commaV Opaleye.ppSqlExpr (toList sqlExprs)
132− where
133− sqlExprs = Opaleye.sqlExpr <$> columns
src/Rel8/Statement/SQL.hsdeleted−29
@@ -1,29 +0,0 @@
1−module Rel8.Statement.SQL
2− ( showDelete
3− , showInsert
4− , showUpdate
5− )
6−where
7−
8−-- base
9−import Prelude
10−
11−-- rel8
12−import Rel8.Statement.Delete ( Delete, ppDelete )
13−import Rel8.Statement.Insert ( Insert, ppInsert )
14−import Rel8.Statement.Update ( Update, ppUpdate )
15−
16−
17−-- | Convert a 'Delete' to a 'String' containing a @DELETE@ statement.
18−showDelete :: Delete a -> String
19−showDelete = show . ppDelete
20−
21−
22−-- | Convert an 'Insert' to a 'String' containing an @INSERT@ statement.
23−showInsert :: Insert a -> String
24−showInsert = show . ppInsert
25−
26−
27−-- | Convert an 'Update' to a 'String' containing an @UPDATE@ statement.
28−showUpdate :: Update a -> String
29−showUpdate = show . ppUpdate
src/Rel8/Statement/Select.hs+35−121
@@ -1,147 +1,61 @@
1−{-# language DeriveTraversable #-}
2−{-# language DerivingStrategies #-}
3−{-# language FlexibleContexts #-}
4−{-# language MonoLocalBinds #-}
5{-# language ScopedTypeVariables #-}
1{-# language ScopedTypeVariables #-}
6−{-# language StandaloneKindSignatures #-}
7{-# language TypeApplications #-}
2{-# language TypeApplications #-}
8
3
9module Rel8.Statement.Select
4module Rel8.Statement.Select
10 ( select
5 ( select
11− , ppSelect
6+ , selectWithNames
12−
13− , Optimized(..)
14− , ppPrimSelect
15− , ppRows
16 )
7 )
17where
8where
18
9
19-- base
10-- base
20−import Data.Foldable ( toList )
11+import Control.Exception ( throwIO )
21−import Data.Kind ( Type )
22−import Data.Void ( Void )
23−import Prelude hiding ( undefined )
12+import Prelude
24
13
25-- hasql
14-- hasql
15+import Hasql.Connection ( Connection )
26import qualified Hasql.Decoders as Hasql
16import qualified Hasql.Decoders as Hasql
27import qualified Hasql.Encoders as Hasql
17import qualified Hasql.Encoders as Hasql
18+import qualified Hasql.Session as Hasql
28import qualified Hasql.Statement as Hasql
19import qualified Hasql.Statement as Hasql
29
20
30−-- opaleye
31−import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
32−import qualified Opaleye.Internal.HaskellDB.Sql as Opaleye
33−import qualified Opaleye.Internal.HaskellDB.Sql.Print as Opaleye
34−import qualified Opaleye.Internal.PrimQuery as Opaleye
35−import qualified Opaleye.Internal.Print as Opaleye
36−import qualified Opaleye.Internal.Optimize as Opaleye
37−import qualified Opaleye.Internal.QueryArr as Opaleye hiding ( Select )
38−import qualified Opaleye.Internal.Sql as Opaleye hiding ( Values )
39−import qualified Opaleye.Internal.Tag as Opaleye
40−
41−-- pretty
42−import Text.PrettyPrint ( Doc )
43−
44-- rel8
21-- rel8
45−import Rel8.Expr ( Expr )
46−import Rel8.Expr.Bool ( false )
47−import Rel8.Expr.Opaleye ( toPrimExpr )
48import Rel8.Query ( Query )
22import Rel8.Query ( Query )
49−import Rel8.Query.Opaleye ( toOpaleye )
23+import Rel8.Query.SQL ( sqlForQuery, sqlForQueryWithNames )
50import Rel8.Schema.Name ( Selects )
24import Rel8.Schema.Name ( Selects )
51−import Rel8.Table ( Table )
52−import Rel8.Table.Cols ( toCols )
53−import Rel8.Table.Name ( namesFromLabels )
54−import Rel8.Table.Opaleye ( castTable, exprsWithNames )
55−import qualified Rel8.Table.Opaleye as T
56import Rel8.Table.Serialize ( Serializable, parse )
25import Rel8.Table.Serialize ( Serializable, parse )
57−import Rel8.Table.Undefined ( undefined )
58
26
59-- text
27-- text
60import qualified Data.Text as Text
28import qualified Data.Text as Text
61import Data.Text.Encoding ( encodeUtf8 )
29import Data.Text.Encoding ( encodeUtf8 )
62
30
63
31
64−-- | Run a @SELECT@ statement, returning all rows.
32+-- | Run a @SELECT@ query, returning all rows.
65select :: forall exprs a. Serializable exprs a
33select :: forall exprs a. Serializable exprs a
66− => Query exprs -> Hasql.Statement () [a]
34+ => Connection -> Query exprs -> IO [a]
67−select query = Hasql.Statement bytes params decode prepare
35+select c query = case sqlForQuery query of
68− where
36+ Nothing -> pure []
69− bytes = encodeUtf8 (Text.pack sql)
37+ Just sql -> Hasql.run session c >>= either throwIO pure
70− params = Hasql.noParams
38+ where
71− decode = Hasql.rowList (parse @exprs @a)
39+ session = Hasql.statement () statement
72− prepare = False
40+ statement = Hasql.Statement bytes params decode prepare
73− sql = show doc
41+ bytes = encodeUtf8 (Text.pack sql)
74− doc = ppSelect query
42+ params = Hasql.noParams
75−
43+ decode = Hasql.rowList (parse @exprs @a)
76−
44+ prepare = False
77−ppSelect :: Table Expr a => Query a -> Doc
45+
78−ppSelect query =
46+
79− Opaleye.ppSql $ primSelectWith names (toCols exprs') primQuery'
47+selectWithNames :: forall exprs a names.
80− where
81− names = namesFromLabels
82− (exprs, primQuery, _) =
83− Opaleye.runSimpleQueryArrStart (toOpaleye query) ()
84− (exprs', primQuery') = case optimize primQuery of
85− Empty -> (undefined, Opaleye.Product (pure (pure Opaleye.Unit)) never)
86− Unit -> (exprs, Opaleye.Unit)
87− Optimized pq -> (exprs, pq)
88− never = pure (toPrimExpr false)
89−
90−
91−ppRows :: Table Expr a => Query a -> Doc
92−ppRows query = case optimize primQuery of
93− -- Special case VALUES because we can't use DEFAULT inside a SELECT
94− Optimized (Opaleye.Values symbols rows)
95− | eqSymbols symbols (toList (T.exprs a)) ->
96− Opaleye.ppValues_ (map Opaleye.sqlExpr <$> toList rows)
97− _ -> ppSelect query
98− where
99− (a, primQuery, _) = Opaleye.runSimpleQueryArrStart (toOpaleye query) ()
100−
101− eqSymbols (symbol : symbols) (Opaleye.AttrExpr symbol' : exprs)
102− | eqSymbol symbol symbol' = eqSymbols symbols exprs
103− | otherwise = False
104− eqSymbols [] [] = True
105− eqSymbols _ _ = False
106−
107− eqSymbol
108− (Opaleye.Symbol name (Opaleye.UnsafeTag tag))
109− (Opaleye.Symbol name' (Opaleye.UnsafeTag tag'))
110− = name == name' && tag == tag'
111−
112−
113−ppPrimSelect :: Query a -> (Optimized Doc, a)
114−ppPrimSelect query =
115− (Opaleye.ppSql . primSelect <$> optimize primQuery, a)
116− where
117− (a, primQuery, _) = Opaleye.runSimpleQueryArrStart (toOpaleye query) ()
118−
119−
120−type Optimized :: Type -> Type
121−data Optimized a = Empty | Unit | Optimized a
122− deriving stock (Functor, Foldable, Traversable, Show)
123−
124−
125−optimize :: Opaleye.PrimQuery' a -> Optimized (Opaleye.PrimQuery' Void)
126−optimize query = case Opaleye.removeEmpty (Opaleye.optimize query) of
127− Nothing -> Empty
128− Just Opaleye.Unit -> Unit
129− Just query' -> Optimized query'
130−
131−
132−primSelect :: Opaleye.PrimQuery' Void -> Opaleye.Select
133−primSelect = Opaleye.foldPrimQuery Opaleye.sqlQueryGenerator
134−
135−
136−primSelectWith :: Selects names exprs
48+ ( Selects names exprs
137− => names -> exprs -> Opaleye.PrimQuery' Void -> Opaleye.Select
49+ , Serializable exprs a
138−primSelectWith names exprs query =
50+ )
139− Opaleye.SelectFrom $ Opaleye.newSelect
51+ => Connection -> names -> Query exprs -> IO [a]
140− { Opaleye.attrs = Opaleye.SelectAttrs attrs
52+selectWithNames c names query = case sqlForQueryWithNames names query of
141− , Opaleye.tables = Opaleye.oneTable (primSelect query)
53+ Nothing -> pure []
142− }
54+ Just sql -> Hasql.run session c >>= either throwIO pure
143− where
55+ where
144− attrs = makeAttr <$> exprsWithNames names (castTable exprs)
56+ session = Hasql.statement () statement
145− where
57+ statement = Hasql.Statement bytes params decode prepare
146− makeAttr (label, expr) =
58+ bytes = encodeUtf8 (Text.pack sql)
147− (Opaleye.sqlExpr expr, Just (Opaleye.SqlColumn label))
59+ params = Hasql.noParams
60+ decode = Hasql.rowList (parse @exprs @a)
61+ prepare = False
src/Rel8/Statement/Set.hsdeleted−33
@@ -1,33 +0,0 @@
1−{-# language MonoLocalBinds #-}
2−{-# language NamedFieldPuns #-}
3−
4−module Rel8.Statement.Set
5− ( ppSet
6− )
7−where
8−
9−-- base
10−import Data.Foldable ( toList )
11−import Prelude ()
12−
13−-- opaleye
14−import qualified Opaleye.Internal.HaskellDB.Sql.Print as Opaleye
15−import qualified Opaleye.Internal.Sql as Opaleye
16−
17−-- pretty
18−import Text.PrettyPrint ( Doc, (<+>), equals, text )
19−
20−-- rel8
21−import Rel8.Schema.Name ( Selects, ppColumn )
22−import Rel8.Schema.Table ( TableSchema(..) )
23−import Rel8.Table.Opaleye ( attributes, exprsWithNames )
24−
25−
26−ppSet :: Selects names exprs
27− => TableSchema names -> (exprs -> exprs) -> Doc
28−ppSet schema@TableSchema {columns} f =
29− text "SET" <+> Opaleye.commaV ppAssign (toList assigns)
30− where
31− assigns = exprsWithNames columns (f (attributes schema))
32− ppAssign (column, expr) =
33− ppColumn column <+> equals <+> Opaleye.ppSqlExpr (Opaleye.sqlExpr expr)
src/Rel8/Statement/Update.hs+80−38
@@ -1,37 +1,43 @@
1−{-# language DuplicateRecordFields #-}
2{-# language GADTs #-}
1{-# language GADTs #-}
3{-# language NamedFieldPuns #-}
2{-# language NamedFieldPuns #-}
4−{-# language RecordWildCards #-}
3+{-# language ScopedTypeVariables #-}
5{-# language StandaloneKindSignatures #-}
4{-# language StandaloneKindSignatures #-}
6−{-# language StrictData #-}
5+{-# language TypeApplications #-}
7
6
8module Rel8.Statement.Update
7module Rel8.Statement.Update
9 ( Update(..)
8 ( Update(..)
10 , update
9 , update
11− , ppUpdate
12 )
10 )
13where
11where
14
12
15-- base
13-- base
14+import Control.Exception ( throwIO )
16import Data.Kind ( Type )
15import Data.Kind ( Type )
17import Prelude
16import Prelude
18
17
19-- hasql
18-- hasql
19+import Hasql.Connection ( Connection )
20+import qualified Hasql.Decoders as Hasql
20import qualified Hasql.Encoders as Hasql
21import qualified Hasql.Encoders as Hasql
22+import qualified Hasql.Session as Hasql
21import qualified Hasql.Statement as Hasql
23import qualified Hasql.Statement as Hasql
22
24
23−-- pretty
25+-- opaleye
24−import Text.PrettyPrint ( Doc, (<+>), ($$), text )
26+import qualified Opaleye.Internal.Manipulation as Opaleye
27+
28+-- profunctors
29+import Data.Profunctor ( lmap )
25
30
26-- rel8
31-- rel8
27import Rel8.Expr ( Expr )
32import Rel8.Expr ( Expr )
28−import Rel8.Query ( Query )
33+import Rel8.Expr.Opaleye ( toColumn, toPrimExpr )
29import Rel8.Schema.Name ( Selects )
34import Rel8.Schema.Name ( Selects )
30−import Rel8.Schema.Table ( TableSchema(..), ppTable )
35+import Rel8.Schema.Table ( TableSchema )
31−import Rel8.Statement.Returning ( Returning, decodeReturning, ppReturning )
36+import Rel8.Statement.Returning ( Returning( Projection, NumberOfRowsAffected ) )
32−import Rel8.Statement.Set ( ppSet )
37+import Rel8.Table ( fromColumns, toColumns )
33−import Rel8.Statement.Using ( ppFrom )
38+import Rel8.Table.Insert ( toInsert )
34−import Rel8.Statement.Where ( ppWhere )
39+import Rel8.Table.Opaleye ( table, unpackspec )
40+import Rel8.Table.Serialize ( Serializable, parse )
35
41
36-- text
42-- text
37import qualified Data.Text as Text
43import qualified Data.Text as Text
@@ -44,12 +50,9 @@ data Update a where
44 Update :: Selects names exprs =>
50 Update :: Selects names exprs =>
45 { target :: TableSchema names
51 { target :: TableSchema names
46 -- ^ Which table to update.
52 -- ^ Which table to update.
47− , from :: Query from
48− -- ^ @FROM@ clause — this can be used to join against other tables,
49− -- and its results can be referenced in the @SET@ and @WHERE@ clauses.
50− , set :: from -> exprs -> exprs
53+ , set :: exprs -> exprs
51 -- ^ How to update each selected row.
54 -- ^ How to update each selected row.
52− , updateWhere :: from -> exprs -> Expr Bool
55+ , updateWhere :: exprs -> Expr Bool
53 -- ^ Which rows to select for update.
56 -- ^ Which rows to select for update.
54 , returning :: Returning names a
57 , returning :: Returning names a
55 -- ^ What to return from the @UPDATE@ statement.
58 -- ^ What to return from the @UPDATE@ statement.
@@ -57,27 +60,66 @@ data Update a where
57 -> Update a
60 -> Update a
58
61
59
62
60−ppUpdate :: Update a -> Doc
63+-- | Run an @UPDATE@ statement.
61−ppUpdate Update {..} = case ppFrom from of
64+--
62− Nothing ->
65+-- >>> mapM_ print =<< select c (each projectSchema)
63− text "UPDATE" <+> ppTable target $$
66+-- Project {projectAuthorId = 1, projectName = "rel8"}
64− ppSet target id $$
67+-- Project {projectAuthorId = 2, projectName = "aeson"}
65− text "WHERE false"
68+-- Project {projectAuthorId = 2, projectName = "text"}
66− Just (fromDoc, i) ->
69+--
67− text "UPDATE" <+> ppTable target $$
70+-- >>> :{
68− ppSet target (set i) $$
71+-- update c Update
69− fromDoc $$
72+-- { target = projectSchema
70− ppWhere target (updateWhere i) $$
73+-- , set = \p -> p { projectName = "Rel8!" }
71− ppReturning target returning
74+-- , updateWhere = \p -> projectName p ==. lit "rel8"
75+-- , returning = NumberOfRowsAffected
76+-- }
77+-- :}
78+-- 1
79+--
80+-- >>> mapM_ print =<< select c (each projectSchema)
81+-- Project {projectAuthorId = 2, projectName = "aeson"}
82+-- Project {projectAuthorId = 2, projectName = "text"}
83+-- Project {projectAuthorId = 1, projectName = "Rel8!"}
84+update :: Connection -> Update a -> IO a
85+update c Update {target, set, updateWhere, returning} =
86+ case returning of
87+ NumberOfRowsAffected -> Hasql.run session c >>= either throwIO pure
88+ where
89+ session = Hasql.statement () statement
90+ statement = Hasql.Statement bytes params decode prepare
91+ bytes = encodeUtf8 $ Text.pack sql
92+ params = Hasql.noParams
93+ decode = Hasql.rowsAffected
94+ prepare = False
95+ sql = Opaleye.arrangeUpdateSql target' set' where'
96+ where
97+ target' = lmap toInsert $ table $ toColumns <$> target
98+ set' = toColumns . set . fromColumns
99+ where' = toColumn . toPrimExpr . updateWhere . fromColumns
72
100
101+ Projection project -> Hasql.run session c >>= either throwIO pure
102+ where
103+ session = Hasql.statement () statement
104+ statement = Hasql.Statement bytes params decode prepare
105+ bytes = encodeUtf8 $ Text.pack sql
106+ params = Hasql.noParams
107+ decode = decoder project
108+ prepare = False
109+ sql =
110+ Opaleye.arrangeUpdateReturningSql
111+ unpackspec
112+ target'
113+ set'
114+ where'
115+ project'
116+ where
117+ target' = lmap toInsert $ table $ toColumns <$> target
118+ set' = toColumns . set . fromColumns
119+ where' = toColumn . toPrimExpr . updateWhere . fromColumns
120+ project' = toColumns . project . fromColumns
73
121
74−-- | Run an @UPDATE@ statement.
75−update :: Update a -> Hasql.Statement () a
76−update u@Update {returning} = Hasql.Statement bytes params decode prepare
77 where
122 where
78− bytes = encodeUtf8 $ Text.pack sql
123+ decoder :: forall exprs projection a. Serializable projection a
79− params = Hasql.noParams
124+ => (exprs -> projection) -> Hasql.Result [a]
80− decode = decodeReturning returning
125+ decoder _ = Hasql.rowList (parse @projection @a)
81− prepare = False
82− sql = show doc
83− doc = ppUpdate u
src/Rel8/Statement/Using.hsdeleted−36
@@ -1,36 +0,0 @@
1−module Rel8.Statement.Using
2− ( ppFrom
3− , ppUsing
4− )
5−where
6−
7−-- base
8−import Prelude
9−
10−-- pretty
11−import Text.PrettyPrint ( Doc, (<+>), parens, text )
12−
13−-- rel8
14−import Rel8.Query ( Query )
15−import Rel8.Schema.Table ( TableSchema(..), ppTable )
16−import Rel8.Statement.Select ( Optimized(..), ppPrimSelect )
17−
18−
19−ppFrom :: Query a -> Maybe (Doc, a)
20−ppFrom = ppJoin "FROM"
21−
22−
23−ppUsing :: Query a -> Maybe (Doc, a)
24−ppUsing = ppJoin "USING"
25−
26−
27−ppJoin :: String -> Query a -> Maybe (Doc, a)
28−ppJoin clause join = do
29− doc <- case ofrom of
30− Empty -> Nothing
31− Unit -> Just mempty
32− Optimized doc -> Just $ text clause <+> parens doc <+> ppTable alias
33− pure (doc, a)
34− where
35− alias = TableSchema {name = "T1", schema = Nothing, columns = ()}
36− (ofrom, a) = ppPrimSelect join
src/Rel8/Statement/View.hs+28−47
@@ -1,78 +1,59 @@
1{-# language FlexibleContexts #-}
1{-# language FlexibleContexts #-}
2−{-# language MonoLocalBinds #-}
3
2
4module Rel8.Statement.View
3module Rel8.Statement.View
5 ( createView
4 ( createView
6− , createOrReplaceView
7 )
5 )
8where
6where
9
7
10-- base
8-- base
9+import Control.Exception ( throwIO )
10+import Control.Monad ( (>=>) )
11+import Data.Foldable ( fold )
12+import Data.Maybe ( fromMaybe )
11import Prelude
13import Prelude
12
14
13-- hasql
15-- hasql
16+import Hasql.Connection ( Connection )
14import qualified Hasql.Decoders as Hasql
17import qualified Hasql.Decoders as Hasql
15import qualified Hasql.Encoders as Hasql
18import qualified Hasql.Encoders as Hasql
19+import qualified Hasql.Session as Hasql
16import qualified Hasql.Statement as Hasql
20import qualified Hasql.Statement as Hasql
17
21
18-- rel8
22-- rel8
19import Rel8.Query ( Query )
23import Rel8.Query ( Query )
24+import Rel8.Query.SQL ( sqlForQueryWithNames )
20import Rel8.Schema.Name ( Selects )
25import Rel8.Schema.Name ( Selects )
21−import Rel8.Schema.Table ( TableSchema )
26+import Rel8.Schema.Table ( TableSchema( TableSchema ) )
22−import Rel8.Statement.Insert ( ppInto )
27+import Rel8.Table.Alternative ( emptyTable )
23−import Rel8.Statement.Select ( ppSelect )
24−
25−-- pretty
26−import Text.PrettyPrint ( Doc, (<+>), ($$), text )
27
28
28-- text
29-- text
29import qualified Data.Text as Text
30import qualified Data.Text as Text
30import Data.Text.Encoding ( encodeUtf8 )
31import Data.Text.Encoding ( encodeUtf8 )
31
32
32
33
33−data CreateView = Create | CreateOrReplace
34−
35−
36−-- | Given a 'TableSchema' and 'Query', @createView@ runs a @CREATE VIEW@
37−-- statement that will save the given query as a view. This can be useful if
38−-- you want to share Rel8 queries with other applications.
39createView :: Selects names exprs
34createView :: Selects names exprs
40− => TableSchema names -> Query exprs -> Hasql.Statement () ()
35+ => TableSchema names -> Query exprs -> Connection -> IO ()
41−createView =
36+createView (TableSchema name mschema names) query =
42− createViewGeneric Create
37+ Hasql.run session >=> either throwIO pure
43−
44−
45−-- | Given a 'TableSchema' and 'Query', @createOrReplaceView@ runs a
46−-- @CREATE OR REPLACE VIEW@ statement that will save the given query
47−-- as a view, replacing the current view definition if it exists and
48−-- adheres to the restrictions in place for replacing a view in
49−-- PostgreSQL.
50−createOrReplaceView :: Selects names exprs
51− => TableSchema names -> Query exprs -> Hasql.Statement () ()
52−createOrReplaceView =
53− createViewGeneric CreateOrReplace
54−
55−
56−createViewGeneric :: Selects names exprs
57− => CreateView -> TableSchema names -> Query exprs -> Hasql.Statement () ()
58−createViewGeneric replace schema query =
59− Hasql.Statement bytes params decode prepare
60 where
38 where
39+ session = Hasql.statement () statement
40+ statement = Hasql.Statement bytes params decode prepare
61 bytes = encodeUtf8 (Text.pack sql)
41 bytes = encodeUtf8 (Text.pack sql)
62 params = Hasql.noParams
42 params = Hasql.noParams
63 decode = Hasql.noResult
43 decode = Hasql.noResult
64 prepare = False
44 prepare = False
65− sql = show doc
45+ sql = "CREATE VIEW " <> title <> " WITH " <> select
66− doc = ppCreateView schema query replace
46+ where
67−
47+ title = case mschema of
68−
48+ Nothing -> quote name
69−ppCreateView :: Selects names exprs
49+ Just schema -> quote schema <> "." <> quote name
70− => TableSchema names -> Query exprs -> CreateView -> Doc
50+ select = fromMaybe fallback $ sqlForQueryWithNames names query
71−ppCreateView schema query replace =
51+ where
72− createOrReplace replace <+>
52+ fallback = fold $ sqlForQueryWithNames names emptyTable
73− ppInto schema $$
53+
74− text "AS" <+>
54+
75− ppSelect query
55+quote :: String -> String
56+quote string = "\"" <> concatMap go string <> "\""
76 where
57 where
77− createOrReplace Create = text "CREATE VIEW"
58+ go '"' = "\"\""
78− createOrReplace CreateOrReplace = text "CREATE OR REPLACE VIEW"
59+ go c = [c]
src/Rel8/Statement/Where.hsdeleted−31
@@ -1,31 +0,0 @@
1−{-# language MonoLocalBinds #-}
2−
3−module Rel8.Statement.Where
4− ( ppWhere
5− )
6−where
7−
8−-- base
9−import Prelude
10−
11−-- opaleye
12−import qualified Opaleye.Internal.HaskellDB.Sql.Print as Opaleye
13−import qualified Opaleye.Internal.Sql as Opaleye
14−
15−-- pretty
16−import Text.PrettyPrint ( Doc, (<+>), text )
17−
18−-- rel8
19−import Rel8.Expr ( Expr )
20−import Rel8.Expr.Opaleye ( toPrimExpr )
21−import Rel8.Schema.Name ( Selects )
22−import Rel8.Schema.Table ( TableSchema )
23−import Rel8.Table.Opaleye ( attributes )
24−
25−
26−ppWhere :: Selects names exprs
27− => TableSchema names -> (exprs -> Expr Bool) -> Doc
28−ppWhere schema where_ = text "WHERE" <+> ppExpr condition
29− where
30− ppExpr = Opaleye.ppSqlExpr . Opaleye.sqlExpr . toPrimExpr
31− condition = where_ (attributes schema)
src/Rel8/Table.hs+147−149
@@ -1,46 +1,40 @@
1−{-# language AllowAmbiguousTypes #-}
2{-# language DataKinds #-}
1{-# language DataKinds #-}
3−{-# language DefaultSignatures #-}
2+{-# language DisambiguateRecordFields #-}
4{-# language FlexibleContexts #-}
3{-# language FlexibleContexts #-}
5{-# language FlexibleInstances #-}
4{-# language FlexibleInstances #-}
6{-# language FunctionalDependencies #-}
5{-# language FunctionalDependencies #-}
7−{-# language ScopedTypeVariables #-}
8{-# language StandaloneKindSignatures #-}
6{-# language StandaloneKindSignatures #-}
9−{-# language TypeApplications #-}
10{-# language TypeFamilies #-}
7{-# language TypeFamilies #-}
11{-# language UndecidableInstances #-}
8{-# language UndecidableInstances #-}
12
9
13module Rel8.Table
10module Rel8.Table
14− ( Table
15− ( Columns, Context, fromColumns, toColumns
11+ ( Table (Columns, Context)
16− , FromExprs, fromResult, toResult
12+ , toColumns, fromColumns
17− , Transpose
18− )
19 , Congruent
13 , Congruent
20− , TTable, TColumns, TContext, TFromExprs, TTranspose
21− , TSerialize
22 )
14 )
23where
15where
24
16
25-- base
17-- base
26import Data.Functor.Identity ( Identity( Identity ) )
18import Data.Functor.Identity ( Identity( Identity ) )
27import Data.Kind ( Constraint, Type )
19import Data.Kind ( Constraint, Type )
28−import GHC.Generics ( Generic, Rep, from, to )
20+import Prelude
29−import Prelude hiding ( null )
30
21
31-- rel8
22-- rel8
32−import Rel8.FCF ( Eval, Exp )
23+import {-# SOURCE #-} Rel8.Expr ( Expr )
33−import Rel8.Generic.Map ( Map )
24+import Rel8.Opaque ( Opaque )
34−import Rel8.Generic.Table.Record
25+import Rel8.Schema.Context ( Col(..) )
35− ( GTable, GColumns, GContext, gfromColumns, gtoColumns
26+import Rel8.Schema.Context.Label ( Labelable, labeler, unlabeler )
36− , GSerialize, gfromResult, gtoResult
37− )
38−import Rel8.Generic.Record ( Record(..) )
39import Rel8.Schema.HTable ( HTable )
27import Rel8.Schema.HTable ( HTable )
40−import Rel8.Schema.HTable.Identity ( HIdentity( HIdentity ) )
28+import Rel8.Schema.HTable.Identity ( HIdentity(..) )
29+import Rel8.Schema.HTable.Label ( HLabel, hlabel, hunlabel )
30+import Rel8.Schema.HTable.Pair ( HPair(..) )
31+import Rel8.Schema.HTable.Quartet ( HQuartet(..) )
32+import Rel8.Schema.HTable.Quintet ( HQuintet(..) )
33+import Rel8.Schema.HTable.Trio ( HTrio(..) )
34+import Rel8.Schema.HTable.Type ( HType( HType ) )
41import qualified Rel8.Schema.Kind as K
35import qualified Rel8.Schema.Kind as K
42−import Rel8.Schema.Null ( Sql )
36+import Rel8.Schema.Nullability ( Sql )
43−import Rel8.Schema.Result ( Result )
37+import Rel8.Schema.Spec ( KnownSpec )
44import Rel8.Type ( DBType )
38import Rel8.Type ( DBType )
45
39
46
40
@@ -48,173 +42,177 @@ import Rel8.Type ( DBType )
48-- types that have a finite number of columns. Each of these columns contains
42-- types that have a finite number of columns. Each of these columns contains
49-- data under a shared context, and contexts describe how to interpret the
43-- data under a shared context, and contexts describe how to interpret the
50-- metadata about a column to a particular Haskell type. In Rel8, we have
44-- metadata about a column to a particular Haskell type. In Rel8, we have
51−-- contexts for expressions (the 'Rel8.Expr' context), aggregations (the
45+-- contexts for expressions (the 'Expr' context), aggregations (the 'Aggregate'
52−-- 'Rel8.Aggregate' context), insert values (the 'Rel8.Insert' contex), among
46+-- context), insert values (the 'Insert' contex), among others.
53−-- others.
54--
47--
55-- In typical usage of Rel8 you don't need to derive instances of 'Table'
48-- In typical usage of Rel8 you don't need to derive instances of 'Table'
56−-- yourself, as anything that's an instance of 'Rel8.Rel8able' is always a
49+-- yourself, as anything that's an instance of 'Rel8able' is always a 'Table'.
57−-- 'Table'.
58type Table :: K.Context -> Type -> Constraint
50type Table :: K.Context -> Type -> Constraint
59−class
60− ( HTable (Columns a)
61− , context ~ Context a
62− , a ~ Transpose context a
63− )
64− => Table context a | a -> context
51+class (HTable (Columns a), context ~ Context a) => Table context a | a -> context where
65− where
66 -- | The 'HTable' functor that describes the schema of this table.
52 -- | The 'HTable' functor that describes the schema of this table.
67 type Columns a :: K.HTable
53 type Columns a :: K.HTable
68
54
69 -- | The common context that all columns use as an interpretation.
55 -- | The common context that all columns use as an interpretation.
70 type Context a :: K.Context
56 type Context a :: K.Context
71
57
72− -- | The @FromExprs@ type family maps a type in the @Expr@ context to the
58+ toColumns :: a -> Columns a (Col (Context a))
73− -- corresponding Haskell type.
59+ fromColumns :: Columns a (Col (Context a)) -> a
74− type FromExprs a :: Type
75
60
76− type Transpose (context' :: K.Context) a :: Type
77
61
62+-- | Any 'HTable' is also a 'Table'.
63+instance HTable t => Table context (t (Col context)) where
64+ type Columns (t (Col context)) = t
65+ type Context (t (Col context)) = context
78
66
79− toColumns :: a -> Columns a context
67+ toColumns = id
80− fromColumns :: Columns a context -> a
68+ fromColumns = id
81
69
82− fromResult :: Columns a Result -> FromExprs a
83− toResult :: FromExprs a -> Columns a Result
84
70
85− type Columns a = GColumns TColumns (Rep (Record a))
71+-- | Any context is trivially a table.
86− type Context a = GContext TContext (Rep (Record a))
72+instance KnownSpec spec => Table context (Col context spec) where
87− type FromExprs a = Map TFromExprs a
88− type Transpose context a = Map (TTranspose context) a
89−
90− default toColumns ::
91− ( Generic (Record a)
92− , GTable (TTable context) TColumns (Rep (Record a))
93− , Columns a ~ GColumns TColumns (Rep (Record a))
94− )
95− => a -> Columns a context
96− toColumns =
97− gtoColumns @(TTable context) @TColumns toColumns .
98− from .
99− Record
100−
101− default fromColumns ::
102− ( Generic (Record a)
103− , GTable (TTable context) TColumns (Rep (Record a))
104− , Columns a ~ GColumns TColumns (Rep (Record a))
105− )
106− => Columns a context -> a
107− fromColumns =
108− unrecord .
109− to .
110− gfromColumns @(TTable context) @TColumns fromColumns
111−
112− default toResult ::
113− ( Generic (Record (FromExprs a))
114− , GSerialize TSerialize TColumns (Rep (Record a)) (Rep (Record (FromExprs a)))
115− , Columns a ~ GColumns TColumns (Rep (Record a))
116− )
117− => FromExprs a -> Columns a Result
118− toResult =
119− gtoResult
120− @TSerialize
121− @TColumns
122− @(Rep (Record a))
123− @(Rep (Record (FromExprs a)))
124− (\(_ :: proxy x) -> toResult @(Context x) @x) .
125− from .
126− Record
127−
128− default fromResult ::
129− ( Generic (Record (FromExprs a))
130− , GSerialize TSerialize TColumns (Rep (Record a)) (Rep (Record (FromExprs a)))
131− , Columns a ~ GColumns TColumns (Rep (Record a))
132− )
133− => Columns a Result -> FromExprs a
134− fromResult =
135− unrecord .
136− to .
137− gfromResult
138− @TSerialize
139− @TColumns
140− @(Rep (Record a))
141− @(Rep (Record (FromExprs a)))
142− (\(_ :: proxy x) -> fromResult @(Context x) @x)
143−
144−
145−instance Sql DBType a => Table Result (Identity a) where
146− type Columns (Identity a) = HIdentity a
73+ type Columns (Col context spec) = HIdentity spec
147− type Context (Identity a) = Result
74+ type Context (Col context spec) = context
148− type FromExprs (Identity a) = a
149− type Transpose to (Identity a) = to a
150
75
151 toColumns = HIdentity
76 toColumns = HIdentity
152− fromColumns (HIdentity a) = a
77+ fromColumns = unHIdentity
153− toResult a = HIdentity (Identity a)
154− fromResult (HIdentity (Identity a)) = a
155−
156
78
157−data TTable :: K.Context -> Type -> Exp Constraint
158−type instance Eval (TTable context a) = Table context a
159
79
80+instance Sql DBType a => Table Identity (Identity a) where
81+ type Columns (Identity a) = HType a
82+ type Context (Identity a) = Identity
160
83
161−data TColumns :: Type -> Exp K.HTable
84+ toColumns (Identity a) = HType (Result a)
162−type instance Eval (TColumns a) = Columns a
85+ fromColumns (HType (Result a)) = Identity a
163
86
164
87
165−data TContext :: Type -> Exp K.Context
88+{-}
166−type instance Eval (TContext a) = Context a
89+instance Sql DBType a => Table Insertion (Insertion a) where
90+ type Columns (Insertion a) = HType a
91+ type Context (Insertion a) = Insertion
167
92
93+ toColumns (Insertion a) = HType (RequiredInsert a)
94+ fromColumns (HType (RequiredInsert a)) = Insertion a
95+-}
168
96
169−data TFromExprs :: Type -> Exp Type
170−type instance Eval (TFromExprs a) = FromExprs a
171
97
172−
98+instance
173−data TTranspose :: K.Context -> Type -> Exp Type
99+ ( Table context a, Table context b
174−type instance Eval (TTranspose context a) = Transpose context a
100+ , Labelable context
175−
101+ ) =>
176−
177−data TSerialize :: Type -> Type -> Exp Constraint
178−type instance Eval (TSerialize expr a) =
179− ( Table (Context expr) expr
180− , a ~ FromExprs expr
181− )
182−
183−
184−instance (Table context a, Table context b) => Table context (a, b)
102+ Table context (a, b)
103+ where
104+ type Columns (a, b) =
105+ HPair
106+ (HLabel "fst" (Columns a))
107+ (HLabel "snd" (Columns b))
108+ type Context (a, b) = Context a
109+
110+ toColumns (a, b) = HPair
111+ { hfst = hlabel labeler $ toColumns a
112+ , hsnd = hlabel labeler $ toColumns b
113+ }
114+ fromColumns (HPair a b) =
115+ ( fromColumns $ hunlabel unlabeler a
116+ , fromColumns $ hunlabel unlabeler b
117+ )
185
118
186
119
187instance
120instance
188 ( Table context a, Table context b, Table context c
121 ( Table context a, Table context b, Table context c
189− )
122+ , Labelable context
190− => Table context (a, b, c)
123+ ) => Table context (a, b, c)
124+ where
125+ type Columns (a, b, c) =
126+ HTrio
127+ (HLabel "fst" (Columns a))
128+ (HLabel "snd" (Columns b))
129+ (HLabel "trd" (Columns c))
130+ type Context (a, b, c) = Context a
131+
132+ toColumns (a, b, c) = HTrio
133+ { hfst = hlabel labeler $ toColumns a
134+ , hsnd = hlabel labeler $ toColumns b
135+ , htrd = hlabel labeler $ toColumns c
136+ }
137+ fromColumns (HTrio a b c) =
138+ ( fromColumns $ hunlabel unlabeler a
139+ , fromColumns $ hunlabel unlabeler b
140+ , fromColumns $ hunlabel unlabeler c
141+ )
191
142
192
143
193instance
144instance
194 ( Table context a, Table context b, Table context c, Table context d
145 ( Table context a, Table context b, Table context c, Table context d
195− )
146+ , Labelable context
196− => Table context (a, b, c, d)
147+ ) => Table context (a, b, c, d)
148+ where
149+ type Columns (a, b, c, d) =
150+ HQuartet
151+ (HLabel "fst" (Columns a))
152+ (HLabel "snd" (Columns b))
153+ (HLabel "trd" (Columns c))
154+ (HLabel "frt" (Columns d))
155+ type Context (a, b, c, d) = Context a
156+
157+ toColumns (a, b, c, d) = HQuartet
158+ { hfst = hlabel labeler $ toColumns a
159+ , hsnd = hlabel labeler $ toColumns b
160+ , htrd = hlabel labeler $ toColumns c
161+ , hfrt = hlabel labeler $ toColumns d
162+ }
163+ fromColumns (HQuartet a b c d) =
164+ ( fromColumns $ hunlabel unlabeler a
165+ , fromColumns $ hunlabel unlabeler b
166+ , fromColumns $ hunlabel unlabeler c
167+ , fromColumns $ hunlabel unlabeler d
168+ )
197
169
198
170
199instance
171instance
200 ( Table context a, Table context b, Table context c, Table context d
172 ( Table context a, Table context b, Table context c, Table context d
201 , Table context e
173 , Table context e
202− )
174+ , Labelable context
203− => Table context (a, b, c, d, e)
175+ ) => Table context (a, b, c, d, e)
176+ where
177+ type Columns (a, b, c, d, e) =
178+ HQuintet
179+ (HLabel "fst" (Columns a))
180+ (HLabel "snd" (Columns b))
181+ (HLabel "trd" (Columns c))
182+ (HLabel "frt" (Columns d))
183+ (HLabel "fft" (Columns e))
184+ type Context (a, b, c, d, e) = Context a
185+
186+ toColumns (a, b, c, d, e) = HQuintet
187+ { hfst = hlabel labeler $ toColumns a
188+ , hsnd = hlabel labeler $ toColumns b
189+ , htrd = hlabel labeler $ toColumns c
190+ , hfrt = hlabel labeler $ toColumns d
191+ , hfft = hlabel labeler $ toColumns e
192+ }
193+ fromColumns (HQuintet a b c d e) =
194+ ( fromColumns $ hunlabel unlabeler a
195+ , fromColumns $ hunlabel unlabeler b
196+ , fromColumns $ hunlabel unlabeler c
197+ , fromColumns $ hunlabel unlabeler d
198+ , fromColumns $ hunlabel unlabeler e
199+ )
204
200
205
201
206−instance
202+instance Table Expr Opaque where
207− ( Table context a, Table context b, Table context c, Table context d
203+ type Columns Opaque = HType Opaque
208− , Table context e, Table context f
204+ type Context Opaque = Expr
209− )
210− => Table context (a, b, c, d, e, f)
211
205
206+ fromColumns = error "opaque"
207+ toColumns = error "opaque"
212
208
213−instance
209+
214− ( Table context a, Table context b, Table context c, Table context d
210+instance Table context (Opaque context a) where
215− , Table context e, Table context f, Table context g
211+ type Columns (Opaque context a) = HType Opaque
216− )
212+ type Context (Opaque context a) = context
217− => Table context (a, b, c, d, e, f, g)
213+
214+ fromColumns = error "opaque"
215+ toColumns = error "opaque"
218
216
219
217
220type Congruent :: Type -> Type -> Constraint
218type Congruent :: Type -> Type -> Constraint
src/Rel8/Table/ADT.hsdeleted−173
@@ -1,173 +0,0 @@
1−{-# language AllowAmbiguousTypes #-}
2−{-# language DataKinds #-}
3−{-# language FlexibleContexts #-}
4−{-# language FlexibleInstances #-}
5−{-# language MultiParamTypeClasses #-}
6−{-# language RankNTypes #-}
7−{-# language ScopedTypeVariables #-}
8−{-# language StandaloneKindSignatures #-}
9−{-# language TypeApplications #-}
10−{-# language TypeFamilyDependencies #-}
11−{-# language UndecidableInstances #-}
12−{-# language UndecidableSuperClasses #-}
13−
14−module Rel8.Table.ADT
15− ( ADT( ADT )
16− , ADTable
17− , BuildableADT
18− , BuildADT, buildADT
19− , ConstructableADT
20− , ConstructADT, constructADT
21− , DeconstructADT, deconstructADT
22− , NameADT, nameADT
23− , AggregateADT, aggregateADT
24− , ADTRep
25− )
26−where
27−
28−-- base
29−import Data.Kind ( Constraint, Type )
30−import GHC.Generics ( Generic, from, to )
31−import GHC.TypeLits ( Symbol )
32−import Prelude
33−
34−-- rel8
35−import Rel8.Aggregate ( Aggregate )
36−import Rel8.Expr ( Expr )
37−import Rel8.FCF ( Eval, Exp )
38−import Rel8.Generic.Construction
39− ( GGBuildable
40− , GGBuild, ggbuild
41− , GGConstructable
42− , GGConstruct, ggconstruct
43− , GGDeconstruct, ggdeconstruct
44− , GGName, ggname
45− , GGAggregate, ggaggregate
46− )
47−import Rel8.Generic.Record ( Record( Record ), unrecord )
48−import Rel8.Generic.Rel8able
49− ( Rel8able
50− , GRep, GColumns, gfromColumns, gtoColumns
51− , GFromExprs, gfromResult, gtoResult
52− , TSerialize, deserialize, serialize
53− )
54−import qualified Rel8.Generic.Table.ADT as G
55−import qualified Rel8.Kind.Algebra as K
56−import Rel8.Schema.HTable ( HTable )
57−import qualified Rel8.Schema.Kind as K
58−import Rel8.Schema.Name ( Name )
59−import Rel8.Schema.Result ( Result )
60−import Rel8.Table ( Table, TColumns )
61−
62−
63−type ADT :: K.Rel8able -> K.Rel8able
64−newtype ADT t context = ADT (GColumnsADT t context)
65−
66−
67−instance ADTable t => Rel8able (ADT t) where
68− type GColumns (ADT t) = GColumnsADT t
69− type GFromExprs (ADT t) = t Result
70−
71− gfromColumns _ = ADT
72− gtoColumns _ (ADT a) = a
73−
74− gfromResult =
75− unrecord .
76− to .
77− G.gfromResultADT
78− @TSerialize
79− @TColumns
80− @(Eval (ADTRep t Expr))
81− @(Eval (ADTRep t Result))
82− (\(_ :: proxy x) -> deserialize @_ @x)
83−
84− gtoResult =
85− G.gtoResultADT
86− @TSerialize
87− @TColumns
88− @(Eval (ADTRep t Expr))
89− @(Eval (ADTRep t Result))
90− (\(_ :: proxy x) -> serialize @_ @x) .
91− from .
92− Record
93−
94−
95−type ADTable :: K.Rel8able -> Constraint
96−class
97− ( Generic (Record (t Result))
98− , HTable (GColumnsADT t)
99− , G.GSerializeADT TSerialize TColumns (Eval (ADTRep t Expr)) (Eval (ADTRep t Result))
100− )
101− => ADTable t
102−instance
103− ( Generic (Record (t Result))
104− , HTable (GColumnsADT t)
105− , G.GSerializeADT TSerialize TColumns (Eval (ADTRep t Expr)) (Eval (ADTRep t Result))
106− )
107− => ADTable t
108−
109−
110−type BuildableADT :: K.Rel8able -> Symbol -> Constraint
111−class GGBuildable 'K.Sum name (ADTRep t) => BuildableADT t name
112−instance GGBuildable 'K.Sum name (ADTRep t) => BuildableADT t name
113−
114−
115−type BuildADT :: K.Rel8able -> Symbol -> Type
116−type BuildADT t name = GGBuild 'K.Sum name (ADTRep t) (ADT t Expr)
117−
118−
119−buildADT :: forall t name. BuildableADT t name => BuildADT t name
120−buildADT =
121− ggbuild @'K.Sum @name @(ADTRep t) @(ADT t Expr) ADT
122−
123−
124−type ConstructableADT :: K.Rel8able -> Constraint
125−class GGConstructable 'K.Sum (ADTRep t) => ConstructableADT t
126−instance GGConstructable 'K.Sum (ADTRep t) => ConstructableADT t
127−
128−
129−type ConstructADT :: K.Rel8able -> Type
130−type ConstructADT t = forall r. GGConstruct 'K.Sum (ADTRep t) r
131−
132−
133−constructADT :: forall t. ConstructableADT t => ConstructADT t -> ADT t Expr
134−constructADT f =
135− ggconstruct @'K.Sum @(ADTRep t) @(ADT t Expr) ADT
136− (f @(ADT t Expr))
137−
138−
139−type DeconstructADT :: K.Rel8able -> Type -> Type
140−type DeconstructADT t r = GGDeconstruct 'K.Sum (ADTRep t) (ADT t Expr) r
141−
142−
143−deconstructADT :: forall t r. (ConstructableADT t, Table Expr r)
144− => DeconstructADT t r
145−deconstructADT =
146− ggdeconstruct @'K.Sum @(ADTRep t) @(ADT t Expr) @r (\(ADT a) -> a)
147−
148−
149−type NameADT :: K.Rel8able -> Type
150−type NameADT t = GGName 'K.Sum (ADTRep t) (ADT t Name)
151−
152−
153−nameADT :: forall t. ConstructableADT t => NameADT t
154−nameADT = ggname @'K.Sum @(ADTRep t) @(ADT t Name) ADT
155−
156−
157−type AggregateADT :: K.Rel8able -> Type
158−type AggregateADT t = forall r. GGAggregate 'K.Sum (ADTRep t) r
159−
160−
161−aggregateADT :: forall t. ConstructableADT t
162− => AggregateADT t -> ADT t Expr -> ADT t Aggregate
163−aggregateADT f =
164− ggaggregate @'K.Sum @(ADTRep t) @(ADT t Expr) @(ADT t Aggregate) ADT (\(ADT a) -> a)
165− (f @(ADT t Aggregate))
166−
167−
168−data ADTRep :: K.Rel8able -> K.Context -> Exp (Type -> Type)
169−type instance Eval (ADTRep t context) = GRep t context
170−
171−
172−type GColumnsADT :: K.Rel8able -> K.HTable
173−type GColumnsADT t = G.GColumnsADT TColumns (GRep t Expr)
src/Rel8/Table/Aggregate.hs+27−40
@@ -6,8 +6,11 @@
6{-# language ViewPatterns #-}
6{-# language ViewPatterns #-}
7
7
8module Rel8.Table.Aggregate
8module Rel8.Table.Aggregate
9− ( groupBy, hgroupBy
9+ ( groupBy
10+ , listAgg
10− , listAgg, nonEmptyAgg
11+ , nonEmptyAgg
12+ , sequenceAggregate
13+ , distributeAggregate
11 )
14 )
12where
15where
13
16
@@ -16,49 +19,25 @@ import Data.Functor.Identity ( Identity( Identity ) )
16import Prelude
19import Prelude
17
20
18-- rel8
21-- rel8
19−import Rel8.Aggregate ( Aggregate, Aggregates )
22+import Rel8.Aggregate ( Aggregate, Aggregates, Col(..) )
20−import Rel8.Expr ( Expr )
23+import Rel8.Expr ( Expr, Col(..) )
21−import Rel8.Expr.Aggregate
24+import Rel8.Expr.Aggregate ( groupByExpr, listAggExpr, nonEmptyAggExpr )
22− ( groupByExpr
23− , slistAggExpr
24− , snonEmptyAggExpr
25− )
26import Rel8.Schema.Dict ( Dict( Dict ) )
25import Rel8.Schema.Dict ( Dict( Dict ) )
27−import Rel8.Schema.HTable ( HTable, hfield, htabulate )
26+import Rel8.Schema.HTable ( htabulate, hfield )
28import Rel8.Schema.HTable.Vectorize ( hvectorize )
27import Rel8.Schema.HTable.Vectorize ( hvectorize )
29−import Rel8.Schema.Null ( Sql )
30−import Rel8.Schema.Spec ( Spec( Spec, info ) )
31−import Rel8.Table ( toColumns, fromColumns )
28+import Rel8.Table ( Table, toColumns, fromColumns )
32import Rel8.Table.Eq ( EqTable, eqTable )
29import Rel8.Table.Eq ( EqTable, eqTable )
33import Rel8.Table.List ( ListTable )
30import Rel8.Table.List ( ListTable )
34import Rel8.Table.NonEmpty ( NonEmptyTable )
31import Rel8.Table.NonEmpty ( NonEmptyTable )
35−import Rel8.Type.Eq ( DBEq )
36
32
37
33
38-- | Group equal tables together. This works by aggregating each column in the
34-- | Group equal tables together. This works by aggregating each column in the
39-- given table with 'groupByExpr'.
35-- given table with 'groupByExpr'.
40−--
41−-- For example, if we have a table of items, we could group the items by the
42−-- order they belong to:
43−--
44−-- @
45−-- itemsByOrder :: Query (OrderId Expr, ListTable Expr (Item Expr))
46−-- itemsByOrder = aggregate $ do
47−-- item <- each itemSchema
48−-- let orderId = groupBy (itemOrderId item)
49−-- let orderItems = listAgg item
50−-- pure (orderId, orderItems)
51−-- @
52−groupBy :: forall exprs aggregates. (EqTable exprs, Aggregates aggregates exprs)
36+groupBy :: forall exprs. EqTable exprs => exprs -> Aggregate exprs
53− => exprs -> aggregates
37+groupBy (toColumns -> exprs) = fromColumns $ htabulate $ \field ->
54−groupBy = fromColumns . hgroupBy (eqTable @exprs) . toColumns
55−
56−
57−hgroupBy :: HTable t => t (Dict (Sql DBEq)) -> t Expr -> t Aggregate
58−hgroupBy eqs exprs = htabulate $ \field ->
59− case hfield eqs field of
38+ case hfield (eqTable @exprs) field of
60 Dict -> case hfield exprs field of
39 Dict -> case hfield exprs field of
61− expr -> groupByExpr expr
40+ DB expr -> Aggregation $ groupByExpr expr
62
41
63
42
64-- | Aggregate rows into a single row containing an array of all aggregated
43-- | Aggregate rows into a single row containing an array of all aggregated
@@ -71,22 +50,30 @@ hgroupBy eqs exprs = htabulate $ \field ->
71-- items:
50-- items:
72--
51--
73-- @
52-- @
74−-- ordersWithItems :: Query (Order Expr, ListTable Expr (Item Expr))
53+-- ordersWithItems :: Query (Order Expr, ListTable (Item Expr))
75-- ordersWithItems = do
54-- ordersWithItems = do
76-- order <- each orderSchema
55-- order <- each orderSchema
77-- items <- aggregate $ listAgg <$> itemsFromOrder order
56-- items <- aggregate $ listAgg <$> itemsFromOrder order
78-- return (order, items)
57-- return (order, items)
79-- @
58-- @
80−listAgg :: Aggregates aggregates exprs => exprs -> ListTable Aggregate aggregates
59+listAgg :: Table Expr exprs => exprs -> Aggregate (ListTable exprs)
81listAgg (toColumns -> exprs) = fromColumns $
60listAgg (toColumns -> exprs) = fromColumns $
82 hvectorize
61 hvectorize
83− (\Spec {info} (Identity a) -> slistAggExpr info a)
62+ (\_ (Identity (DB a)) -> Aggregation $ listAggExpr a)
84 (pure exprs)
63 (pure exprs)
85
64
86
65
87-- | Like 'listAgg', but the result is guaranteed to be a non-empty list.
66-- | Like 'listAgg', but the result is guaranteed to be a non-empty list.
88−nonEmptyAgg :: Aggregates aggregates exprs => exprs -> NonEmptyTable Aggregate aggregates
67+nonEmptyAgg :: Table Expr exprs => exprs -> Aggregate (NonEmptyTable exprs)
89nonEmptyAgg (toColumns -> exprs) = fromColumns $
68nonEmptyAgg (toColumns -> exprs) = fromColumns $
90 hvectorize
69 hvectorize
91− (\Spec {info} (Identity a) -> snonEmptyAggExpr info a)
70+ (\_ (Identity (DB a)) -> Aggregation $ nonEmptyAggExpr a)
92 (pure exprs)
71 (pure exprs)
72+
73+
74+sequenceAggregate :: Aggregates aggregates exprs => aggregates -> Aggregate exprs
75+sequenceAggregate = fromColumns . toColumns
76+
77+
78+distributeAggregate :: Aggregates aggregates exprs => Aggregate exprs -> aggregates
79+distributeAggregate = fromColumns . toColumns
src/Rel8/Table/Alternative.hs+2−2
@@ -20,8 +20,8 @@ import Rel8.Table ( Table )
20-- | Like 'Alt' in Haskell. This class is purely a Rel8 concept, and allows you
20-- | Like 'Alt' in Haskell. This class is purely a Rel8 concept, and allows you
21-- to take a choice between two tables. See also 'AlternativeTable'.
21-- to take a choice between two tables. See also 'AlternativeTable'.
22--
22--
23−-- For example, using '<|>:' on 'Rel8.MaybeTable' allows you to combine two
23+-- For example, using '<|>:' on 'MaybeTable' allows you to combine two tables
24−-- tables and to return the first one that is a "just" MaybeTable.
24+-- and to return the first one that is a "just" MaybeTable.
25type AltTable :: (Type -> Type) -> Constraint
25type AltTable :: (Type -> Type) -> Constraint
26class AltTable f where
26class AltTable f where
27 -- | An associative binary operation on 'Table's.
27 -- | An associative binary operation on 'Table's.
src/Rel8/Table/Bool.hs+6−19
@@ -5,7 +5,6 @@
5module Rel8.Table.Bool
5module Rel8.Table.Bool
6 ( bool
6 ( bool
7 , case_
7 , case_
8− , nullable
9 )
8 )
10where
9where
11
10
@@ -13,36 +12,24 @@ where
13import Prelude
12import Prelude
14
13
15-- rel8
14-- rel8
16−import Rel8.Expr ( Expr )
15+import Rel8.Expr ( Expr, Col(..) )
17import Rel8.Expr.Bool ( boolExpr, caseExpr )
16import Rel8.Expr.Bool ( boolExpr, caseExpr )
18−import Rel8.Expr.Null ( isNull, unsafeUnnullify )
19import Rel8.Schema.HTable ( htabulate, hfield )
17import Rel8.Schema.HTable ( htabulate, hfield )
20import Rel8.Table ( Table, fromColumns, toColumns )
18import Rel8.Table ( Table, fromColumns, toColumns )
21
19
22
20
23−-- | An if-then-else expression on tables.
24−--
25−-- @bool x y p@ returns @x@ if @p@ is @False@, and returns @y@ if @p@ is
26−-- @True@.
27bool :: Table Expr a => a -> a -> Expr Bool -> a
21bool :: Table Expr a => a -> a -> Expr Bool -> a
28bool (toColumns -> false) (toColumns -> true) condition =
22bool (toColumns -> false) (toColumns -> true) condition =
29 fromColumns $ htabulate $ \field ->
23 fromColumns $ htabulate $ \field ->
30 case (hfield false field, hfield true field) of
24 case (hfield false field, hfield true field) of
25+ (DB falseExpr, DB trueExpr) ->
31− (falseExpr, trueExpr) -> boolExpr falseExpr trueExpr condition
26+ DB (boolExpr falseExpr trueExpr condition)
32{-# INLINABLE bool #-}
27{-# INLINABLE bool #-}
33
28
34
29
35−-- | Produce a table expression from a list of alternatives. Returns the first
36−-- table where the @Expr Bool@ expression is @True@. If no alternatives are
37−-- true, the given default is returned.
38case_ :: Table Expr a => [(Expr Bool, a)] -> a -> a
30case_ :: Table Expr a => [(Expr Bool, a)] -> a -> a
39case_ (map (fmap toColumns) -> branches) (toColumns -> fallback) =
31case_ (map (fmap toColumns) -> branches) (toColumns -> fallback) =
40 fromColumns $ htabulate $ \field -> case hfield fallback field of
32 fromColumns $ htabulate $ \field -> case hfield fallback field of
41− fallbackExpr ->
33+ DB fallbackExpr ->
42− case map (fmap (`hfield` field)) branches of
34+ case map (fmap (unDB . (`hfield` field))) branches of
43− branchExprs -> caseExpr branchExprs fallbackExpr
35+ branchExprs -> DB (caseExpr branchExprs fallbackExpr)
44−
45−
46−-- | Like 'maybe', but to eliminate @null@.
47−nullable :: Table Expr b => b -> (Expr a -> b) -> Expr (Maybe a) -> b
48−nullable b f ma = bool (f (unsafeUnnullify ma)) b (isNull ma)
src/Rel8/Table/Cols.hsdeleted−50
@@ -1,50 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language FlexibleInstances #-}
3−{-# language MultiParamTypeClasses #-}
4−{-# language StandaloneKindSignatures #-}
5−{-# language TypeFamilies #-}
6−{-# language UndecidableInstances #-}
7−
8−module Rel8.Table.Cols
9− ( Cols( Cols )
10− , fromCols
11− , toCols
12− )
13−where
14−
15−-- base
16−import Data.Kind ( Type )
17−import Prelude
18−
19−-- rel8
20−import qualified Rel8.Schema.Kind as K
21−import Rel8.Schema.HTable ( HTable )
22−import Rel8.Schema.Result ( Result )
23−import Rel8.Table ( Table(..) )
24−
25−
26−type Cols :: K.Context -> K.HTable -> Type
27−newtype Cols context columns = Cols (columns context)
28−
29−
30−instance (HTable columns, context ~ context') =>
31− Table context' (Cols context columns)
32− where
33− type Columns (Cols context columns) = columns
34− type Context (Cols context columns) = context
35− type FromExprs (Cols context columns) = Cols Result columns
36− type Transpose to (Cols context columns) = Cols to columns
37−
38− toColumns (Cols a) = a
39− fromColumns = Cols
40−
41− toResult (Cols a) = a
42− fromResult = Cols
43−
44−
45−fromCols :: Table context a => Cols context (Columns a) -> a
46−fromCols (Cols a) = fromColumns a
47−
48−
49−toCols :: Table context a => a -> Cols context (Columns a)
50−toCols = Cols . toColumns
src/Rel8/Table/Either.hs+116−154
@@ -3,7 +3,6 @@
3{-# language DerivingStrategies #-}
3{-# language DerivingStrategies #-}
4{-# language FlexibleContexts #-}
4{-# language FlexibleContexts #-}
5{-# language FlexibleInstances #-}
5{-# language FlexibleInstances #-}
6−{-# language LambdaCase #-}
7{-# language MultiParamTypeClasses #-}
6{-# language MultiParamTypeClasses #-}
8{-# language NamedFieldPuns #-}
7{-# language NamedFieldPuns #-}
9{-# language ScopedTypeVariables #-}
8{-# language ScopedTypeVariables #-}
@@ -12,232 +11,195 @@
12{-# language TypeFamilies #-}
11{-# language TypeFamilies #-}
13{-# language UndecidableInstances #-}
12{-# language UndecidableInstances #-}
14
13
15−{-# options_ghc -fno-warn-orphans #-}
16−
17module Rel8.Table.Either
14module Rel8.Table.Either
18 ( EitherTable(..)
15 ( EitherTable(..)
19 , eitherTable, leftTable, rightTable
16 , eitherTable, leftTable, rightTable
20 , isLeftTable, isRightTable
17 , isLeftTable, isRightTable
21− , aggregateEitherTable
18+ , aggregateEitherTable, nameEitherTable
22− , nameEitherTable
23 )
19 )
24where
20where
25
21
26-- base
22-- base
27import Data.Bifunctor ( Bifunctor, bimap )
23import Data.Bifunctor ( Bifunctor, bimap )
28−import Data.Functor.Identity ( Identity( Identity ) )
24+import Data.Functor.Identity ( runIdentity )
29import Data.Kind ( Type )
25import Data.Kind ( Type )
30import Prelude hiding ( undefined )
26import Prelude hiding ( undefined )
31
27
32−-- comonad
33−import Control.Comonad ( extract )
34−
35-- rel8
28-- rel8
36−import Rel8.Aggregate ( Aggregate )
29+import Rel8.Aggregate ( Aggregate, unsafeMakeAggregate )
37import Rel8.Expr ( Expr )
30import Rel8.Expr ( Expr )
38−import Rel8.Expr.Aggregate ( groupByExpr )
31+import Rel8.Expr.Opaleye ( fromPrimExpr, toPrimExpr )
39import Rel8.Expr.Serialize ( litExpr )
32import Rel8.Expr.Serialize ( litExpr )
40−import Rel8.Kind.Context ( Reifiable )
33+import Rel8.Schema.Context.Label ( Labelable, labeler, unlabeler, hlabeler )
41−import Rel8.Schema.Context.Nullify ( Nullifiable )
34+import Rel8.Schema.Context.Nullify
42−import Rel8.Schema.Dict ( Dict( Dict ) )
35+ ( Nullifiable, ConstrainTag
36+ , hencodeTag, hdecodeTag
37+ , hnullifier, hunnullifier
38+ )
43−import Rel8.Schema.HTable.Either ( HEitherTable(..) )
39+import Rel8.Schema.HTable.Either ( HEitherTable(..), HEitherNullifiable )
44import Rel8.Schema.HTable.Identity ( HIdentity(..) )
40import Rel8.Schema.HTable.Identity ( HIdentity(..) )
45−import Rel8.Schema.HTable.Label ( hlabel, hunlabel )
41+import Rel8.Schema.HTable.Label ( HLabel, hlabel, hunlabel )
46−import qualified Rel8.Schema.Kind as K
42+import Rel8.Schema.HTable.Nullify ( hnullify, hunnullify )
47import Rel8.Schema.Name ( Name )
43import Rel8.Schema.Name ( Name )
48−import Rel8.Table
49− ( Table, Columns, Context, fromColumns, toColumns
44+import Rel8.Table ( Table, Columns, Context, fromColumns, toColumns )
50− , FromExprs, fromResult, toResult
51− , Transpose
52− )
53import Rel8.Table.Bool ( bool )
45import Rel8.Table.Bool ( bool )
54import Rel8.Table.Eq ( EqTable, eqTable )
46import Rel8.Table.Eq ( EqTable, eqTable )
55−import Rel8.Table.Nullify ( Nullify, aggregateNullify, guard )
47+import Rel8.Table.Lifted
48+ ( Table2, Columns2, ConstrainHContext2, fromColumns2, toColumns2
49+ )
56import Rel8.Table.Ord ( OrdTable, ordTable )
50import Rel8.Table.Ord ( OrdTable, ordTable )
57−import Rel8.Table.Projection ( Biprojectable, Projectable, biproject, project )
51+import Rel8.Table.Recontextualize ( Recontextualize )
58−import Rel8.Table.Serialize ( ToExprs )
52+import Rel8.Table.Tag ( Tag(..), fromExpr, fromName )
59import Rel8.Table.Undefined ( undefined )
53import Rel8.Table.Undefined ( undefined )
60import Rel8.Type.Tag ( EitherTag( IsLeft, IsRight ), isLeft, isRight )
54import Rel8.Type.Tag ( EitherTag( IsLeft, IsRight ), isLeft, isRight )
61
55
62-- semigroupoids
56-- semigroupoids
63−import Data.Functor.Apply ( Apply, (<.>) )
57+import Data.Functor.Apply ( Apply, (<.>), liftF3 )
64import Data.Functor.Bind ( Bind, (>>-) )
58import Data.Functor.Bind ( Bind, (>>-) )
65
59
66
60
67−-- | An @EitherTable a b@ is a Rel8 table that contains either the table @a@ or
68−-- the table @b@. You can construct an @EitherTable@ using 'leftTable' and
69−-- 'rightTable', and eliminate/pattern match using 'eitherTable'.
70−--
71−-- An @EitherTable@ is operationally the same as Haskell's 'Either' type, but
72−-- adapted to work with Rel8.
73−type EitherTable :: K.Context -> Type -> Type -> Type
61+type EitherTable :: Type -> Type -> Type
74−data EitherTable context a b = EitherTable
62+data EitherTable a b = EitherTable
75− { tag :: context EitherTag
63+ { tag :: Tag "isRight" EitherTag
76− , left :: Nullify context a
64+ , left :: a
77− , right :: Nullify context b
65+ , right :: b
78 }
66 }
79 deriving stock Functor
67 deriving stock Functor
80
68
81
69
82−instance Biprojectable (EitherTable context) where
83− biproject f g (EitherTable tag a b) =
84− EitherTable tag (project f a) (project g b)
85−
86−
87−instance Nullifiable context => Bifunctor (EitherTable context) where
70+instance Bifunctor EitherTable where
88− bimap f g (EitherTable tag a b) = EitherTable tag (fmap f a) (fmap g b)
71+ bimap f g (EitherTable tag a b) = EitherTable tag (f a) (g b)
89−
90
72
91−instance Projectable (EitherTable context a) where
92− project f (EitherTable tag a b) = EitherTable tag a (project f b)
93
73
94−
95−instance (context ~ Expr, Table Expr a) => Apply (EitherTable context a) where
74+instance Table Expr a => Apply (EitherTable a) where
96 EitherTable tag l1 f <.> EitherTable tag' l2 a =
75 EitherTable tag l1 f <.> EitherTable tag' l2 a =
97− EitherTable (tag <> tag') (bool l1 l2 (isLeft tag)) (f <.> a)
76+ EitherTable (tag <> tag') (bool l1 l2 (isLeft (expr tag))) (f a)
98
77
99
78
100−instance (context ~ Expr, Table Expr a) => Applicative (EitherTable context a) where
79+instance Table Expr a => Applicative (EitherTable a) where
101 pure = rightTable
80 pure = rightTable
102 (<*>) = (<.>)
81 (<*>) = (<.>)
103
82
104
83
105−instance (context ~ Expr, Table Expr a) => Bind (EitherTable context a) where
84+instance Table Expr a => Bind (EitherTable a) where
106− EitherTable tag l1 a >>- f = case f (extract a) of
85+ EitherTable tag l1 a >>- f = case f a of
107 EitherTable tag' l2 b ->
86 EitherTable tag' l2 b ->
108− EitherTable (tag <> tag') (bool l1 l2 (isRight tag)) b
87+ EitherTable (tag <> tag') (bool l1 l2 (isRight (expr tag))) b
109
88
110
89
111−instance (context ~ Expr, Table Expr a) => Monad (EitherTable context a) where
90+instance Table Expr a => Monad (EitherTable a) where
112 (>>=) = (>>-)
91 (>>=) = (>>-)
113
92
114
93
115−instance (context ~ Expr, Table Expr a, Table Expr b) =>
94+instance (Table Expr a, Table Expr b) => Semigroup (EitherTable a b) where
116− Semigroup (EitherTable context a b)
117− where
118 a <> b = bool a b (isRightTable a)
95 a <> b = bool a b (isRightTable a)
119
96
120
97
121−instance
98+instance Table2 EitherTable where
122− ( Table context a, Table context b
123− , Reifiable context, context ~ context'
124− )
125− => Table context' (EitherTable context a b)
126− where
127− type Columns (EitherTable context a b) = HEitherTable (Columns a) (Columns b)
99+ type Columns2 EitherTable = HEitherTable
128− type Context (EitherTable context a b) = Context a
100+ type ConstrainHContext2 EitherTable = HEitherNullifiable
129− type FromExprs (EitherTable context a b) = Either (FromExprs a) (FromExprs b)
130− type Transpose to (EitherTable context a b) =
131− EitherTable to (Transpose to a) (Transpose to b)
132−
133− toColumns EitherTable {tag, left, right} = HEitherTable
134− { htag = hlabel $ HIdentity tag
135− , hleft = hlabel $ guard tag (== IsLeft) isLeft $ toColumns left
136− , hright = hlabel $ guard tag (== IsRight) isRight $ toColumns right
137− }
138
101
139− fromColumns HEitherTable {htag, hleft, hright} = EitherTable
102+ toColumns2 f g EitherTable {tag, left, right} = HEitherTable
140− { tag = unHIdentity $ hunlabel htag
103+ { htag
141− , left = fromColumns $ hunlabel hleft
104+ , hleft = hnullify (hnullifier tag isLeft) $ f left
142− , right = fromColumns $ hunlabel hright
105+ , hright = hnullify (hnullifier tag isRight) $ g right
143 }
106 }
144−
107+ where
145− toResult = \case
108+ htag = HIdentity (hencodeTag tag)
146− Left table -> HEitherTable
109+
147− { htag = hlabel (HIdentity (Identity IsLeft))
110+ fromColumns2 f g HEitherTable {htag = htag, hleft, hright} =
148− , hleft = hlabel (toResult @_ @(Nullify context a) (Just table))
111+ EitherTable
149− , hright = hlabel (toResult @_ @(Nullify context b) Nothing)
112+ { tag
150− }
113+ , left = f $ runIdentity $
151− Right table -> HEitherTable
114+ hunnullify (\a -> pure . hunnullifier a) hleft
152− { htag = hlabel (HIdentity (Identity IsRight))
115+ , right = g $ runIdentity $
153− , hleft = hlabel (toResult @_ @(Nullify context a) Nothing)
116+ hunnullify (\a -> pure . hunnullifier a) hright
154− , hright = hlabel (toResult @_ @(Nullify context b) (Just table))
155 }
117 }
156−
157− fromResult HEitherTable {htag, hleft, hright} = case hunlabel htag of
158− HIdentity (Identity tag) -> case tag of
159− IsLeft -> maybe err Left $ fromResult @_ @(Nullify context a) (hunlabel hleft)
160− IsRight -> maybe err Right $ fromResult @_ @(Nullify context b) (hunlabel hright)
161 where
118 where
162− err = error "Either.fromColumns: mismatch between tag and data"
119+ tag = hdecodeTag $ unHIdentity htag
120+
121+ {-# INLINABLE fromColumns2 #-}
122+ {-# INLINABLE toColumns2 #-}
163
123
164
124
165−instance (EqTable a, EqTable b, context ~ Expr) =>
125+instance
126+ ( Table context a, Table context b
127+ , Labelable context, Nullifiable context, ConstrainTag context EitherTag
128+ ) =>
166− EqTable (EitherTable context a b)
129+ Table context (EitherTable a b)
167 where
130 where
168− eqTable = HEitherTable
131+ type Columns (EitherTable a b) =
169− { htag = hlabel (HIdentity Dict)
132+ HEitherTable (HLabel "Left" (Columns a)) (HLabel "Right" (Columns b))
170− , hleft = hlabel (eqTable @(Nullify context a))
133+ type Context (EitherTable a b) = Context a
171− , hright = hlabel (eqTable @(Nullify context b))
172− }
173
134
135+ toColumns =
136+ toColumns2
137+ (hlabel labeler . toColumns)
138+ (hlabel labeler . toColumns)
139+ fromColumns =
140+ fromColumns2
141+ (fromColumns . hunlabel unlabeler)
142+ (fromColumns . hunlabel unlabeler)
143+
144+
145+instance
146+ ( Nullifiable from, Labelable from, ConstrainTag from EitherTag
147+ , Nullifiable to, Labelable to, ConstrainTag to EitherTag
148+ , Recontextualize from to a1 b1
149+ , Recontextualize from to a2 b2
150+ ) =>
151+ Recontextualize from to (EitherTable a1 a2) (EitherTable b1 b2)
174
152
175−instance (OrdTable a, OrdTable b, context ~ Expr) =>
176− OrdTable (EitherTable context a b)
177− where
178− ordTable = HEitherTable
179− { htag = hlabel (HIdentity Dict)
180− , hleft = hlabel (ordTable @(Nullify context a))
181− , hright = hlabel (ordTable @(Nullify context b))
182− }
183
153
154+instance (EqTable a, EqTable b) => EqTable (EitherTable a b) where
155+ eqTable =
156+ toColumns2 (hlabel hlabeler) (hlabel hlabeler)
157+ (rightTableWith (eqTable @a) (eqTable @b))
184
158
185−instance (ToExprs exprs1 a, ToExprs exprs2 b, x ~ EitherTable Expr exprs1 exprs2) =>
186− ToExprs x (Either a b)
187
159
160+instance (OrdTable a, OrdTable b) => OrdTable (EitherTable a b) where
161+ ordTable =
162+ toColumns2 (hlabel hlabeler) (hlabel hlabeler)
163+ (rightTableWith (ordTable @a) (ordTable @b))
188
164
189−-- | Test if an 'EitherTable' is a 'leftTable'.
190−isLeftTable :: EitherTable Expr a b -> Expr Bool
191−isLeftTable EitherTable {tag} = isLeft tag
192
165
166+isLeftTable :: EitherTable a b -> Expr Bool
167+isLeftTable = isLeft . expr . tag
193
168
194−-- | Test if an 'EitherTable' is a 'rightTable'.
169+
195−isRightTable :: EitherTable Expr a b -> Expr Bool
170+isRightTable :: EitherTable a b -> Expr Bool
196−isRightTable EitherTable {tag} = isRight tag
171+isRightTable = isRight . expr . tag
197
172
198
173
199−-- | Pattern match/eliminate an 'EitherTable', by providing mappings from a
200−-- 'leftTable' and 'rightTable'.
201eitherTable :: Table Expr c
174eitherTable :: Table Expr c
202− => (a -> c) -> (b -> c) -> EitherTable Expr a b -> c
175+ => (a -> c) -> (b -> c) -> EitherTable a b -> c
203eitherTable f g EitherTable {tag, left, right} =
176eitherTable f g EitherTable {tag, left, right} =
204− bool (f (extract left)) (g (extract right)) (isRight tag)
177+ bool (f left) (g right) (isRight (expr tag))
205
178
206
179
207−-- | Construct a left 'EitherTable'. Like 'Left'.
208−leftTable :: Table Expr b => a -> EitherTable Expr a b
180+leftTable :: Table Expr b => a -> EitherTable a b
209−leftTable a = EitherTable (litExpr IsLeft) (pure a) undefined
181+leftTable a = EitherTable (fromExpr (litExpr IsLeft)) a undefined
210
182
211
183
212−-- | Construct a right 'EitherTable'. Like 'Right'.
213−rightTable :: Table Expr a => b -> EitherTable Expr a b
184+rightTable :: Table Expr a => b -> EitherTable a b
214−rightTable = EitherTable (litExpr IsRight) undefined . pure
185+rightTable = rightTableWith undefined
215
186
216
187
217−-- | Lift a pair of aggregating functions to operate on an 'EitherTable'.
188+rightTableWith :: a -> b -> EitherTable a b
218−-- @leftTable@s and @rightTable@s are grouped separately.
189+rightTableWith = EitherTable (fromExpr (litExpr IsRight))
219−aggregateEitherTable :: ()
220− => (exprs -> aggregates)
221− -> (exprs' -> aggregates')
222− -> EitherTable Expr exprs exprs'
223− -> EitherTable Aggregate aggregates aggregates'
224−aggregateEitherTable f g (EitherTable tag a b) = EitherTable
225− { tag = groupByExpr tag
226− , left = aggregateNullify f a
227− , right = aggregateNullify g b
228− }
229
190
230
191
231−-- | Construct a 'EitherTable' in the 'Name' context. This can be useful if you
192+aggregateEitherTable :: ()
232−-- have a 'EitherTable' that you are storing in a table and need to construct a
193+ => (a -> Aggregate c)
233−-- 'TableSchema'.
194+ -> (b -> Aggregate d)
234−nameEitherTable
195+ -> EitherTable a b
196+ -> Aggregate (EitherTable c d)
197+aggregateEitherTable f g EitherTable {tag, left, right} =
198+ liftF3 EitherTable (tag <$ aggregate) (f left) (g right)
199+ where
200+ Tag {aggregator, expr} = tag
201+ aggregate = unsafeMakeAggregate toPrimExpr fromPrimExpr aggregator expr
202+
203+
235− :: Name EitherTag
204+nameEitherTable :: Name EitherTag -> a -> b -> EitherTable a b
236− -- ^ The name of the column to track whether a row is a 'leftTable' or
237− -- 'rightTable'.
238− -> a
239− -- ^ Names of the columns in the @a@ table.
240− -> b
241− -- ^ Names of the columns in the @b@ table.
242− -> EitherTable Name a b
243−nameEitherTable tag left right = EitherTable tag (pure left) (pure right)
205+nameEitherTable = EitherTable . fromName
src/Rel8/Table/Eq.hs+69−41
@@ -5,12 +5,14 @@
5{-# language DisambiguateRecordFields #-}
5{-# language DisambiguateRecordFields #-}
6{-# language FlexibleContexts #-}
6{-# language FlexibleContexts #-}
7{-# language FlexibleInstances #-}
7{-# language FlexibleInstances #-}
8+{-# language LambdaCase #-}
9+{-# language NamedFieldPuns #-}
8{-# language ScopedTypeVariables #-}
10{-# language ScopedTypeVariables #-}
9{-# language StandaloneKindSignatures #-}
11{-# language StandaloneKindSignatures #-}
10{-# language TypeApplications #-}
12{-# language TypeApplications #-}
11{-# language TypeFamilies #-}
13{-# language TypeFamilies #-}
12−{-# language TypeOperators #-}
13{-# language UndecidableInstances #-}
14{-# language UndecidableInstances #-}
15+{-# language UndecidableSuperClasses #-}
14{-# language ViewPatterns #-}
16{-# language ViewPatterns #-}
15
17
16module Rel8.Table.Eq
18module Rel8.Table.Eq
@@ -23,71 +25,97 @@ import Data.Foldable ( foldl' )
23import Data.Functor.Const ( Const( Const ), getConst )
25import Data.Functor.Const ( Const( Const ), getConst )
24import Data.Kind ( Constraint, Type )
26import Data.Kind ( Constraint, Type )
25import Data.List.NonEmpty ( NonEmpty( (:|) ) )
27import Data.List.NonEmpty ( NonEmpty( (:|) ) )
26−import GHC.Generics ( Rep )
27import Prelude
28import Prelude
28
29
29-- rel8
30-- rel8
30−import Rel8.Expr ( Expr )
31+import Rel8.Expr ( Expr, Col(..) )
31import Rel8.Expr.Bool ( (||.), (&&.) )
32import Rel8.Expr.Bool ( (||.), (&&.) )
32import Rel8.Expr.Eq ( (==.), (/=.) )
33import Rel8.Expr.Eq ( (==.), (/=.) )
33−import Rel8.FCF ( Eval, Exp )
34+import Rel8.Schema.Context.Label ( hlabeler )
34−import Rel8.Generic.Record ( Record )
35−import Rel8.Generic.Table.Record ( GTable, GColumns, gtable )
36import Rel8.Schema.Dict ( Dict( Dict ) )
35import Rel8.Schema.Dict ( Dict( Dict ) )
37−import Rel8.Schema.HTable ( htabulateA, hfield )
36+import Rel8.Schema.HTable
37+ ( HTable, HConstrainTable
38+ , htabulateA, hfield, hdicts
39+ )
38−import Rel8.Schema.HTable.Identity ( HIdentity( HIdentity ) )
40+import Rel8.Schema.HTable.Label ( hlabel )
41+import Rel8.Schema.HTable.Pair ( HPair(..) )
42+import Rel8.Schema.HTable.Quartet ( HQuartet(..) )
39−import Rel8.Schema.Null ( Sql )
43+import Rel8.Schema.HTable.Quintet ( HQuintet(..) )
44+import Rel8.Schema.HTable.Trio ( HTrio(..) )
45+import Rel8.Schema.Spec.ConstrainDBType ( ConstrainDBType )
40−import Rel8.Table ( Table, Columns, toColumns, TColumns )
46+import Rel8.Table ( Table, Columns, toColumns )
41import Rel8.Type.Eq ( DBEq )
47import Rel8.Type.Eq ( DBEq )
48+import Rel8.Schema.Nullability ( Sql )
42
49
43
50
44−-- | The class of 'Table's that can be compared for equality. Equality on
45−-- tables is defined by equality of all columns all columns, so this class
46−-- means "all columns in a 'Table' have an instance of 'DBEq'".
47type EqTable :: Type -> Constraint
51type EqTable :: Type -> Constraint
48class Table Expr a => EqTable a where
52class Table Expr a => EqTable a where
49− eqTable :: Columns a (Dict (Sql DBEq))
53+ eqTable :: Columns a (Dict (ConstrainDBType DBEq))
54+
55+ default eqTable :: ()
56+ => HConstrainTable (Columns a) (ConstrainDBType DBEq)
57+ => Columns a (Dict (ConstrainDBType DBEq))
58+ eqTable = hdicts @(Columns a) @(ConstrainDBType DBEq)
50
59
51− default eqTable ::
52− ( GTable TEqTable TColumns (Rep (Record a))
53− , Columns a ~ GColumns TColumns (Rep (Record a))
54− )
55− => Columns a (Dict (Sql DBEq))
56− eqTable = gtable @TEqTable @TColumns @(Rep (Record a)) table
57− where
58− table (_ :: proxy x) = eqTable @x
59
60
61+instance
62+ ( Table Expr (t Expr)
63+ , f ~ Expr
64+ , HConstrainTable (Columns (t Expr)) (ConstrainDBType DBEq)
65+ )
66+ => EqTable (t f)
60
67
61−data TEqTable :: Type -> Exp Constraint
68+
62−type instance Eval (TEqTable a) = EqTable a
69+instance
70+ ( HTable t
71+ , f ~ Col Expr
72+ , HConstrainTable t (ConstrainDBType DBEq)
73+ )
74+ => EqTable (t f)
63
75
64
76
65−instance Sql DBEq a => EqTable (Expr a) where
77+instance Sql DBEq a => EqTable (Expr a)
66− eqTable = HIdentity Dict
67
78
68
79
69−instance (EqTable a, EqTable b) => EqTable (a, b)
80+instance (EqTable a, EqTable b) => EqTable (a, b) where
81+ eqTable =
82+ HPair
83+ { hfst = hlabel hlabeler (eqTable @a)
84+ , hsnd = hlabel hlabeler (eqTable @b)
85+ }
70
86
71
87
72−instance (EqTable a, EqTable b, EqTable c) => EqTable (a, b, c)
88+instance (EqTable a, EqTable b, EqTable c) => EqTable (a, b, c) where
89+ eqTable =
90+ HTrio
91+ { hfst = hlabel hlabeler (eqTable @a)
92+ , hsnd = hlabel hlabeler (eqTable @b)
93+ , htrd = hlabel hlabeler (eqTable @c)
94+ }
73
95
74
96
75instance (EqTable a, EqTable b, EqTable c, EqTable d) => EqTable (a, b, c, d)
97instance (EqTable a, EqTable b, EqTable c, EqTable d) => EqTable (a, b, c, d)
98+ where
99+ eqTable =
100+ HQuartet
101+ { hfst = hlabel hlabeler (eqTable @a)
102+ , hsnd = hlabel hlabeler (eqTable @b)
103+ , htrd = hlabel hlabeler (eqTable @c)
104+ , hfrt = hlabel hlabeler (eqTable @d)
105+ }
76
106
77
107
78instance (EqTable a, EqTable b, EqTable c, EqTable d, EqTable e) =>
108instance (EqTable a, EqTable b, EqTable c, EqTable d, EqTable e) =>
79 EqTable (a, b, c, d, e)
109 EqTable (a, b, c, d, e)
80−
110+ where
81−
111+ eqTable =
82−instance (EqTable a, EqTable b, EqTable c, EqTable d, EqTable e, EqTable f) =>
112+ HQuintet
83− EqTable (a, b, c, d, e, f)
113+ { hfst = hlabel hlabeler (eqTable @a)
84−
114+ , hsnd = hlabel hlabeler (eqTable @b)
85−
115+ , htrd = hlabel hlabeler (eqTable @c)
86−instance
116+ , hfrt = hlabel hlabeler (eqTable @d)
87− ( EqTable a, EqTable b, EqTable c, EqTable d, EqTable e, EqTable f
117+ , hfft = hlabel hlabeler (eqTable @e)
88− , EqTable g
118+ }
89− )
90− => EqTable (a, b, c, d, e, f, g)
91
119
92
120
93-- | Compare two 'Table's for equality. This corresponds to comparing all
121-- | Compare two 'Table's for equality. This corresponds to comparing all
@@ -97,7 +125,7 @@ instance
97(toColumns -> as) ==: (toColumns -> bs) =
125(toColumns -> as) ==: (toColumns -> bs) =
98 foldl1' (&&.) $ getConst $ htabulateA $ \field ->
126 foldl1' (&&.) $ getConst $ htabulateA $ \field ->
99 case (hfield as field, hfield bs field) of
127 case (hfield as field, hfield bs field) of
100− (a, b) -> case hfield (eqTable @a) field of
128+ (DB a, DB b) -> case hfield (eqTable @a) field of
101 Dict -> Const (pure (a ==. b))
129 Dict -> Const (pure (a ==. b))
102infix 4 ==:
130infix 4 ==:
103
131
@@ -109,7 +137,7 @@ infix 4 ==:
109(toColumns -> as) /=: (toColumns -> bs) =
137(toColumns -> as) /=: (toColumns -> bs) =
110 foldl1' (||.) $ getConst $ htabulateA $ \field ->
138 foldl1' (||.) $ getConst $ htabulateA $ \field ->
111 case (hfield as field, hfield bs field) of
139 case (hfield as field, hfield bs field) of
112− (a, b) -> case hfield (eqTable @a) field of
140+ (DB a, DB b) -> case hfield (eqTable @a) field of
113 Dict -> Const (pure (a /=. b))
141 Dict -> Const (pure (a /=. b))
114infix 4 /=:
142infix 4 /=:
115
143
src/Rel8/Table/HKD.hsdeleted−228
@@ -1,228 +0,0 @@
1−{-# language AllowAmbiguousTypes #-}
2−{-# language DataKinds #-}
3−{-# language FlexibleContexts #-}
4−{-# language FlexibleInstances #-}
5−{-# language MultiParamTypeClasses #-}
6−{-# language RankNTypes #-}
7−{-# language ScopedTypeVariables #-}
8−{-# language StandaloneKindSignatures #-}
9−{-# language TypeApplications #-}
10−{-# language TypeFamilies #-}
11−{-# language UndecidableInstances #-}
12−{-# language UndecidableSuperClasses #-}
13−
14−module Rel8.Table.HKD
15− ( HKD( HKD )
16− , HKDable
17− , BuildableHKD
18− , BuildHKD, buildHKD
19− , ConstructableHKD
20− , ConstructHKD, constructHKD
21− , DeconstructHKD, deconstructHKD
22− , NameHKD, nameHKD
23− , AggregateHKD, aggregateHKD
24− , HKDRep
25− )
26−where
27−
28−-- base
29−import Data.Kind ( Constraint, Type )
30−import GHC.Generics ( Generic, Rep, from, to )
31−import GHC.TypeLits ( Symbol )
32−import Prelude
33−
34−-- rel8
35−import Rel8.Aggregate ( Aggregate )
36−import Rel8.Column ( TColumn )
37−import Rel8.Expr ( Expr )
38−import Rel8.FCF ( Eval, Exp )
39−import Rel8.Kind.Algebra ( KnownAlgebra )
40−import Rel8.Generic.Construction
41− ( GGBuildable
42− , GGBuild, ggbuild
43− , GGConstructable
44− , GGConstruct, ggconstruct
45− , GGDeconstruct, ggdeconstruct
46− , GGName, ggname
47− , GGAggregate, ggaggregate
48− )
49−import Rel8.Generic.Map ( GMap )
50−import Rel8.Generic.Record
51− ( GRecord, GRecordable, grecord, gunrecord
52− , Record( Record ), unrecord
53− )
54−import Rel8.Generic.Rel8able
55− ( Rel8able
56− , GColumns, gfromColumns, gtoColumns
57− , GFromExprs, gfromResult, gtoResult
58− )
59−import Rel8.Generic.Table
60− ( GGSerialize, GGColumns, GAlgebra, ggfromResult, ggtoResult
61− )
62−import Rel8.Generic.Table.Record ( GTable, GContext )
63−import qualified Rel8.Generic.Table.Record as G
64−import qualified Rel8.Schema.Kind as K
65−import Rel8.Schema.HTable ( HTable )
66−import Rel8.Schema.Name ( Name )
67−import Rel8.Schema.Result ( Result )
68−import Rel8.Table
69− ( Table, fromColumns, toColumns, fromResult, toResult
70− , TTable, TColumns, TContext
71− , TSerialize
72− )
73−
74−
75−type GColumnsHKD :: Type -> K.HTable
76−type GColumnsHKD a =
77− Eval (GGColumns (GAlgebra (Rep a)) TColumns (GRecord (GMap (TColumn Expr) (Rep a))))
78−
79−
80−type HKD :: Type -> K.Rel8able
81−newtype HKD a f = HKD (GColumnsHKD a f)
82−
83−
84−instance HKDable a => Rel8able (HKD a) where
85− type GColumns (HKD a) = GColumnsHKD a
86− type GFromExprs (HKD a) = a
87−
88− gfromColumns _ = HKD
89− gtoColumns _ (HKD a) = a
90−
91− gfromResult =
92− unrecord .
93− to .
94− ggfromResult
95− @(GAlgebra (Rep a))
96− @TSerialize
97− @TColumns
98− @(Eval (HKDRep a Expr))
99− @(Eval (HKDRep a Result))
100− (\(_ :: proxy x) -> fromResult @_ @x)
101−
102− gtoResult =
103− ggtoResult
104− @(GAlgebra (Rep a))
105− @TSerialize
106− @TColumns
107− @(Eval (HKDRep a Expr))
108− @(Eval (HKDRep a Result))
109− (\(_ :: proxy x) -> toResult @_ @x) .
110− from .
111− Record
112−
113−
114−instance
115− ( GTable (TTable f) TColumns (GRecord (GMap (TColumn f) (Rep a)))
116− , G.GColumns TColumns (GRecord (GMap (TColumn f) (Rep a))) ~ GColumnsHKD a
117− , GContext TContext (GRecord (GMap (TColumn f) (Rep a))) ~ f
118− , GRecordable (GMap (TColumn f) (Rep a))
119− )
120− => Generic (HKD a f)
121− where
122− type Rep (HKD a f) = GMap (TColumn f) (Rep a)
123−
124− from =
125− gunrecord @(GMap (TColumn f) (Rep a)) .
126− G.gfromColumns
127− @(TTable f)
128− @TColumns
129− fromColumns .
130− (\(HKD a) -> a)
131−
132− to =
133− HKD .
134− G.gtoColumns
135− @(TTable f)
136− @TColumns
137− toColumns .
138− grecord @(GMap (TColumn f) (Rep a))
139−
140−
141−type HKDable :: Type -> Constraint
142−class
143− ( Generic (Record a)
144− , HTable (GColumns (HKD a))
145− , KnownAlgebra (GAlgebra (Rep a))
146− , Eval (GGSerialize (GAlgebra (Rep a)) TSerialize TColumns (Eval (HKDRep a Expr)) (Eval (HKDRep a Result)))
147− , GRecord (GMap (TColumn Result) (Rep a)) ~ Rep (Record a)
148− )
149− => HKDable a
150−instance
151− ( Generic (Record a)
152− , HTable (GColumns (HKD a))
153− , KnownAlgebra (GAlgebra (Rep a))
154− , Eval (GGSerialize (GAlgebra (Rep a)) TSerialize TColumns (Eval (HKDRep a Expr)) (Eval (HKDRep a Result)))
155− , GRecord (GMap (TColumn Result) (Rep a)) ~ Rep (Record a)
156− )
157− => HKDable a
158−
159−
160−type Top_ :: Constraint
161−class Top_
162−instance Top_
163−
164−
165−data Top :: Type -> Exp Constraint
166−type instance Eval (Top _) = Top_
167−
168−
169−type BuildableHKD :: Type -> Symbol -> Constraint
170−class GGBuildable (GAlgebra (Rep a)) name (HKDRep a) => BuildableHKD a name
171−instance GGBuildable (GAlgebra (Rep a)) name (HKDRep a) => BuildableHKD a name
172−
173−
174−type BuildHKD :: Type -> Symbol -> Type
175−type BuildHKD a name = GGBuild (GAlgebra (Rep a)) name (HKDRep a) (HKD a Expr)
176−
177−
178−buildHKD :: forall a name. BuildableHKD a name => BuildHKD a name
179−buildHKD =
180− ggbuild @(GAlgebra (Rep a)) @name @(HKDRep a) @(HKD a Expr) HKD
181−
182−
183−type ConstructableHKD :: Type -> Constraint
184−class GGConstructable (GAlgebra (Rep a)) (HKDRep a) => ConstructableHKD a
185−instance GGConstructable (GAlgebra (Rep a)) (HKDRep a) => ConstructableHKD a
186−
187−
188−type ConstructHKD :: Type -> Type
189−type ConstructHKD a = forall r. GGConstruct (GAlgebra (Rep a)) (HKDRep a) r
190−
191−
192−constructHKD :: forall a. ConstructableHKD a => ConstructHKD a -> HKD a Expr
193−constructHKD f =
194− ggconstruct @(GAlgebra (Rep a)) @(HKDRep a) @(HKD a Expr) HKD
195− (f @(HKD a Expr))
196−
197−
198−type DeconstructHKD :: Type -> Type -> Type
199−type DeconstructHKD a r = GGDeconstruct (GAlgebra (Rep a)) (HKDRep a) (HKD a Expr) r
200−
201−
202−deconstructHKD :: forall a r. (ConstructableHKD a, Table Expr r)
203− => DeconstructHKD a r
204−deconstructHKD = ggdeconstruct @(GAlgebra (Rep a)) @(HKDRep a) @(HKD a Expr) @r (\(HKD a) -> a)
205−
206−
207−type NameHKD :: Type -> Type
208−type NameHKD a = GGName (GAlgebra (Rep a)) (HKDRep a) (HKD a Name)
209−
210−
211−nameHKD :: forall a. ConstructableHKD a => NameHKD a
212−nameHKD = ggname @(GAlgebra (Rep a)) @(HKDRep a) @(HKD a Name) HKD
213−
214−
215−type AggregateHKD :: Type -> Type
216−type AggregateHKD a = forall r. GGAggregate (GAlgebra (Rep a)) (HKDRep a) r
217−
218−
219−aggregateHKD :: forall a. ConstructableHKD a
220− => AggregateHKD a -> HKD a Expr -> HKD a Aggregate
221−aggregateHKD f =
222− ggaggregate @(GAlgebra (Rep a)) @(HKDRep a) @(HKD a Expr) @(HKD a Aggregate) HKD (\(HKD a) -> a)
223− (f @(HKD a Aggregate))
224−
225−
226−data HKDRep :: Type -> K.Context -> Exp (Type -> Type)
227−type instance Eval (HKDRep a context) =
228− GRecord (GMap (TColumn context) (Rep a))
src/Rel8/Table/Insert.hsnew file+51
@@ -0,0 +1,51 @@
1+{-# language FlexibleContexts #-}
2+{-# language NamedFieldPuns #-}
3+{-# language TypeFamilies #-}
4+{-# language ViewPatterns #-}
5+
6+module Rel8.Table.Insert
7+ ( toInsert
8+ , toInsertDefaults
9+ )
10+where
11+
12+-- base
13+import Prelude
14+
15+-- rel8
16+import Rel8.Expr ( Col(..) )
17+import Rel8.Kind.Necessity ( SNecessity( SOptional, SRequired ) )
18+import Rel8.Schema.HTable ( hfield, htabulate, hspecs )
19+import Rel8.Schema.Insert ( Inserts, Col(..) )
20+import Rel8.Schema.Spec ( SSpec(..) )
21+import Rel8.Table ( fromColumns, toColumns )
22+
23+
24+-- | @toInsert@ converts a 'Table' of 'Expr's into a 'Table' that can be used
25+-- with 'insert'. This will override any columns that have default values to
26+-- use exactly what is given. If you want to use default values, you can either
27+-- override the result of @toInsert@, or use 'toInsertDefaults'.
28+toInsert :: Inserts exprs inserts => exprs -> inserts
29+toInsert (toColumns -> exprs) = fromColumns $ htabulate $ \field ->
30+ case hfield hspecs field of
31+ SSpec {necessity} -> case hfield exprs field of
32+ DB expr -> case necessity of
33+ SRequired -> RequiredInsert expr
34+ SOptional -> OptionalInsert (Just expr)
35+
36+
37+-- | @toInsertDefaults@ converts a 'Table' of 'Expr's into a 'Table' that can
38+-- be used with 'insert'. Any columns that have a default value will override
39+-- whatever is in the input expression.
40+--
41+-- One example where this is useful is for any table that has a special @id@
42+-- column, which has a default value to draw a new value from a sequence. If we
43+-- use 'toInsertDefaults', we can provide a dummy value that will be replaced
44+-- with a call to @DEFAULT@.
45+toInsertDefaults :: Inserts exprs inserts => exprs -> inserts
46+toInsertDefaults (toColumns -> exprs) = fromColumns $ htabulate $ \field ->
47+ case hfield hspecs field of
48+ SSpec {necessity} -> case hfield exprs field of
49+ DB expr -> case necessity of
50+ SRequired -> RequiredInsert expr
51+ SOptional -> OptionalInsert Nothing
src/Rel8/Table/Lifted.hsnew file+82
@@ -0,0 +1,82 @@
1+{-# language ConstrainedClassMethods #-}
2+{-# language ConstraintKinds #-}
3+{-# language DataKinds #-}
4+{-# language FlexibleContexts #-}
5+{-# language FlexibleInstances #-}
6+{-# language MultiParamTypeClasses #-}
7+{-# language QuantifiedConstraints #-}
8+{-# language StandaloneKindSignatures #-}
9+{-# language TypeFamilies #-}
10+{-# language UndecidableInstances #-}
11+
12+module Rel8.Table.Lifted
13+ ( Table1( Columns1, ConstrainHContext1, toColumns1, fromColumns1 )
14+ , Table2( Columns2, ConstrainHContext2, toColumns2, fromColumns2 )
15+ , ConstrainContext
16+ )
17+where
18+
19+-- base
20+import Data.Kind ( Constraint, Type )
21+import Prelude ()
22+
23+-- rel8
24+import Rel8.Schema.Context ( Col )
25+import Rel8.Schema.HTable ( HTable )
26+import Rel8.Schema.HTable.Pair
27+import qualified Rel8.Schema.Kind as K
28+
29+
30+type Table1 :: (Type -> Type) -> Constraint
31+class Table1 f where
32+ type Columns1 f :: K.HTable -> K.HTable
33+ type ConstrainHContext1 f :: K.HContext -> Constraint
34+ type ConstrainHContext1 _ = DefaultConstrainContext
35+
36+ toColumns1 :: (ConstrainHContext1 f context, HTable t)
37+ => (a -> t context)
38+ -> f a
39+ -> Columns1 f t context
40+
41+ fromColumns1 :: (ConstrainHContext1 f context, HTable t)
42+ => (t context -> a)
43+ -> Columns1 f t context
44+ -> f a
45+
46+
47+type Table2 :: (Type -> Type -> Type) -> Constraint
48+class Table2 p where
49+ type Columns2 p :: K.HTable -> K.HTable -> K.HTable
50+ type ConstrainHContext2 p :: K.HContext -> Constraint
51+ type ConstrainHContext2 _ = DefaultConstrainContext
52+
53+ toColumns2 :: (ConstrainHContext2 p context, HTable t, HTable u)
54+ => (a -> t context)
55+ -> (b -> u context)
56+ -> p a b
57+ -> Columns2 p t u context
58+
59+ fromColumns2 :: (ConstrainHContext2 p context, HTable t, HTable u)
60+ => (t context -> a)
61+ -> (u context -> b)
62+ -> Columns2 p t u context
63+ -> p a b
64+
65+
66+instance Table2 (,) where
67+ type Columns2 (,) = HPair
68+
69+ toColumns2 f g (a, b) = HPair (f a) (g b)
70+ fromColumns2 f g (HPair a b) = (f a, g b)
71+
72+
73+type DefaultConstrainContext :: K.HContext -> Constraint
74+class DefaultConstrainContext context
75+instance DefaultConstrainContext context
76+
77+
78+type ConstrainContext :: (K.Context -> Constraint) -> K.HContext -> Constraint
79+class (forall context. hcontext ~ Col context => constraint context)
80+ => ConstrainContext constraint hcontext
81+instance (hcontext ~ Col context, constraint context) =>
82+ ConstrainContext constraint hcontext
src/Rel8/Table/List.hs+37−85
@@ -1,4 +1,3 @@
1−{-# language DataKinds #-}
2{-# language FlexibleContexts #-}
1{-# language FlexibleContexts #-}
3{-# language FlexibleInstances #-}
2{-# language FlexibleInstances #-}
4{-# language MultiParamTypeClasses #-}
3{-# language MultiParamTypeClasses #-}
@@ -11,9 +10,7 @@
11
10
12module Rel8.Table.List
11module Rel8.Table.List
13 ( ListTable(..)
12 ( ListTable(..)
14− , ($*)
15 , listTable
13 , listTable
16− , nameListTable
17 )
14 )
18where
15where
19
16
@@ -23,127 +20,82 @@ import Data.Kind ( Type )
23import Prelude
20import Prelude
24
21
25-- rel8
22-- rel8
26−import Rel8.Expr ( Expr )
23+import Rel8.Expr ( Expr, Col(..) )
27import Rel8.Expr.Array ( sappend, sempty, slistOf )
24import Rel8.Expr.Array ( sappend, sempty, slistOf )
28import Rel8.Schema.Dict ( Dict( Dict ) )
25import Rel8.Schema.Dict ( Dict( Dict ) )
29import Rel8.Schema.HTable.List ( HListTable )
26import Rel8.Schema.HTable.List ( HListTable )
30−import Rel8.Schema.HTable.Vectorize
27+import Rel8.Schema.HTable.Vectorize ( happend, hempty, hvectorize )
31− ( hvectorize, hunvectorize
28+import Rel8.Schema.Nullability ( Nullability( Nullable, NonNullable ) )
32− , happend, hempty
33− , hproject, hcolumn
34− )
35−import qualified Rel8.Schema.Kind as K
36−import Rel8.Schema.Name ( Name( Name ) )
37−import Rel8.Schema.Null ( Nullity( Null, NotNull ) )
29+import Rel8.Schema.Spec ( SSpec(..) )
38−import Rel8.Schema.Result ( vectorizer, unvectorizer )
30+import Rel8.Schema.Spec.ConstrainDBType ( dbTypeDict, dbTypeNullability )
39−import Rel8.Schema.Spec ( Spec(..) )
40−import Rel8.Table
41− ( Table, Context, Columns, fromColumns, toColumns
31+import Rel8.Table ( Table, Context, Columns, fromColumns, toColumns )
42− , FromExprs, fromResult, toResult
43− , Transpose
44− )
45import Rel8.Table.Alternative
32import Rel8.Table.Alternative
46 ( AltTable, (<|>:)
33 ( AltTable, (<|>:)
47 , AlternativeTable, emptyTable
34 , AlternativeTable, emptyTable
48 )
35 )
49import Rel8.Table.Eq ( EqTable, eqTable )
36import Rel8.Table.Eq ( EqTable, eqTable )
50import Rel8.Table.Ord ( OrdTable, ordTable )
37import Rel8.Table.Ord ( OrdTable, ordTable )
51−import Rel8.Table.Projection
38+import Rel8.Table.Recontextualize ( Recontextualize )
52− ( Projectable, Projecting, Projection, project, apply
53− )
54−import Rel8.Table.Serialize ( ToExprs )
55
39
56
40
57-- | A @ListTable@ value contains zero or more instances of @a@. You construct
41-- | A @ListTable@ value contains zero or more instances of @a@. You construct
58−-- @ListTable@s with 'Rel8.many' or 'Rel8.listAgg'.
42+-- @ListTable@s with 'many' or 'listAgg'.
59−type ListTable :: K.Context -> Type -> Type
43+type ListTable :: Type -> Type
60−newtype ListTable context a =
61− ListTable (HListTable (Columns a) (Context a))
44+newtype ListTable a = ListTable (HListTable (Columns a) (Col (Context a)))
62−
63
45
64−instance Projectable (ListTable context) where
65− project f (ListTable a) = ListTable (hproject (apply f) a)
66
46
67−
68−instance (Table context a, context ~ context') =>
69− Table context' (ListTable context a)
47+instance Table context a => Table context (ListTable a) where
70− where
71− type Columns (ListTable context a) = HListTable (Columns a)
48+ type Columns (ListTable a) = HListTable (Columns a)
72− type Context (ListTable context a) = Context a
49+ type Context (ListTable a) = Context a
73− type FromExprs (ListTable context a) = [FromExprs a]
74− type Transpose to (ListTable context a) = ListTable to (Transpose to a)
75
50
76 fromColumns = ListTable
51 fromColumns = ListTable
77 toColumns (ListTable a) = a
52 toColumns (ListTable a) = a
78− fromResult = fmap (fromResult @_ @a) . hunvectorize unvectorizer
79− toResult = hvectorize vectorizer . fmap (toResult @_ @a)
80
53
81
54
55+instance Recontextualize from to a b =>
56+ Recontextualize from to (ListTable a) (ListTable b)
57+
58+
82−instance (EqTable a, context ~ Expr) => EqTable (ListTable context a) where
59+instance EqTable a => EqTable (ListTable a) where
83 eqTable =
60 eqTable =
84 hvectorize
61 hvectorize
85− (\Spec {nullity} (Identity Dict) -> case nullity of
62+ (\SSpec {} (Identity dict) -> case dbTypeDict dict of
63+ Dict -> case dbTypeNullability dict of
86− Null -> Dict
64+ Nullable -> Dict
87− NotNull -> Dict)
65+ NonNullable -> Dict)
88 (Identity (eqTable @a))
66 (Identity (eqTable @a))
89
67
90
68
91−instance (OrdTable a, context ~ Expr) => OrdTable (ListTable context a) where
69+instance OrdTable a => OrdTable (ListTable a) where
92 ordTable =
70 ordTable =
93 hvectorize
71 hvectorize
94− (\Spec {nullity} (Identity Dict) -> case nullity of
72+ (\SSpec {} (Identity dict) -> case dbTypeDict dict of
73+ Dict -> case dbTypeNullability dict of
95− Null -> Dict
74+ Nullable -> Dict
96− NotNull -> Dict)
75+ NonNullable -> Dict)
97 (Identity (ordTable @a))
76 (Identity (ordTable @a))
98
77
99
78
100−instance (ToExprs exprs a, context ~ Expr) =>
101− ToExprs (ListTable context exprs) [a]
102−
103−
104−instance context ~ Expr => AltTable (ListTable context) where
79+instance AltTable ListTable where
105 (<|>:) = (<>)
80 (<|>:) = (<>)
106
81
107
82
108−instance context ~ Expr => AlternativeTable (ListTable context) where
83+instance AlternativeTable ListTable where
109 emptyTable = mempty
84 emptyTable = mempty
110
85
111
86
112−instance (context ~ Expr, Table Expr a) => Semigroup (ListTable context a)
87+instance Table Expr a => Semigroup (ListTable a) where
113− where
114− ListTable as <> ListTable bs = ListTable $ happend (const sappend) as bs
88+ ListTable as <> ListTable bs = ListTable $
115−
89+ happend (\_ _ (DB a) (DB b) -> DB (sappend a b)) as bs
116−
117−instance (context ~ Expr, Table Expr a) =>
118− Monoid (ListTable context a)
119− where
120− mempty = ListTable $ hempty $ \Spec {info} -> sempty info
121
90
122
91
123−-- | Project a single expression out of a 'ListTable'.
92+instance Table Expr a => Monoid (ListTable a) where
124−($*) :: Projecting a (Expr b)
93+ mempty = ListTable $ hempty $ \nullability info ->
125− => Projection a (Expr b) -> ListTable Expr a -> Expr [b]
94+ DB (sempty nullability info)
126−f $* ListTable a = hcolumn $ hproject (apply f) a
127−infixl 4 $*
128
95
129
96
130−-- | Construct a @ListTable@ from a list of expressions.
131−listTable :: Table Expr a => [a] -> ListTable Expr a
97+listTable :: Table Expr a => [a] -> ListTable a
132listTable =
98listTable =
133 ListTable .
99 ListTable .
134− hvectorize (\Spec {info} -> slistOf info) .
100+ hvectorize (\SSpec {info} -> DB . slistOf info . fmap unDB) .
135 fmap toColumns
101 fmap toColumns
136−
137−
138−-- | Construct a 'ListTable' in the 'Name' context. This can be useful if you
139−-- have a 'ListTable' that you are storing in a table and need to construct a
140−-- 'TableSchema'.
141−nameListTable
142− :: Table Name a
143− => a -- ^ The names of the columns of elements of the list.
144− -> ListTable Name a
145−nameListTable =
146− ListTable .
147− hvectorize (\_ (Identity (Name a)) -> Name a) .
148− pure .
149− toColumns
src/Rel8/Table/Maybe.hs+116−127
@@ -15,7 +15,6 @@ module Rel8.Table.Maybe
15 ( MaybeTable(..)
15 ( MaybeTable(..)
16 , maybeTable, nothingTable, justTable
16 , maybeTable, nothingTable, justTable
17 , isNothingTable, isJustTable
17 , isNothingTable, isJustTable
18− , fromMaybeTable
19 , ($?)
18 , ($?)
20 , aggregateMaybeTable
19 , aggregateMaybeTable
21 , nameMaybeTable
20 , nameMaybeTable
@@ -23,51 +22,51 @@ module Rel8.Table.Maybe
23where
22where
24
23
25-- base
24-- base
26−import Data.Functor ( ($>) )
25+import Data.Functor.Identity ( runIdentity )
27−import Data.Functor.Identity ( Identity( Identity ) )
28import Data.Kind ( Type )
26import Data.Kind ( Type )
29−import Data.Maybe ( fromMaybe, isJust )
30−import Prelude hiding ( null, undefined )
27+import Prelude hiding ( null, repeat, undefined, zipWith )
31−
32−-- comonad
33−import Control.Comonad ( extract )
34
28
35-- rel8
29-- rel8
36−import Rel8.Aggregate ( Aggregate )
30+import Rel8.Aggregate ( Aggregate, unsafeMakeAggregate )
37import Rel8.Expr ( Expr )
31import Rel8.Expr ( Expr )
38−import Rel8.Expr.Aggregate ( groupByExpr )
39import Rel8.Expr.Bool ( boolExpr )
32import Rel8.Expr.Bool ( boolExpr )
40import Rel8.Expr.Null ( isNull, isNonNull, null, nullify )
33import Rel8.Expr.Null ( isNull, isNonNull, null, nullify )
41−import Rel8.Kind.Context ( Reifiable )
34+import Rel8.Expr.Opaleye ( fromPrimExpr, toPrimExpr )
42−import Rel8.Schema.Dict ( Dict( Dict ) )
35+import Rel8.Schema.Context.Label ( Labelable, labeler, unlabeler, hlabeler )
43−import qualified Rel8.Schema.Kind as K
36+import Rel8.Schema.Context.Nullify
37+ ( Nullifiable, ConstrainTag
38+ , hencodeTag, hdecodeTag
39+ , hnullifier, hunnullifier
40+ )
44import Rel8.Schema.HTable.Identity ( HIdentity(..) )
41import Rel8.Schema.HTable.Identity ( HIdentity(..) )
45−import Rel8.Schema.HTable.Label ( hlabel, hunlabel )
42+import Rel8.Schema.HTable.Label ( HLabel, hlabel, hunlabel )
46−import Rel8.Schema.HTable.Maybe ( HMaybeTable(..) )
43+import Rel8.Schema.HTable.Maybe ( HMaybeTable(..), HMaybeNullifiable )
44+import Rel8.Schema.HTable.Nullify ( hnullify, hunnullify )
47import Rel8.Schema.Name ( Name )
45import Rel8.Schema.Name ( Name )
48−import Rel8.Schema.Null ( Nullity( Null, NotNull ), Sql, nullable )
46+import Rel8.Schema.Nullability
49−import qualified Rel8.Schema.Null as N
47+ ( Nullify
50−import Rel8.Table
48+ , Nullability( Nullable, NonNullable )
51− ( Table, Columns, Context, fromColumns, toColumns
49+ , Sql, nullabilization
52− , FromExprs, fromResult, toResult
53− , Transpose
54 )
50 )
51+import Rel8.Table ( Table, Columns, Context, fromColumns, toColumns )
55import Rel8.Table.Alternative
52import Rel8.Table.Alternative
56 ( AltTable, (<|>:)
53 ( AltTable, (<|>:)
57 , AlternativeTable, emptyTable
54 , AlternativeTable, emptyTable
58 )
55 )
59import Rel8.Table.Bool ( bool )
56import Rel8.Table.Bool ( bool )
60import Rel8.Table.Eq ( EqTable, eqTable )
57import Rel8.Table.Eq ( EqTable, eqTable )
58+import Rel8.Table.Lifted
59+ ( Table1, Columns1, ConstrainHContext1, fromColumns1, toColumns1
60+ )
61import Rel8.Table.Ord ( OrdTable, ordTable )
61import Rel8.Table.Ord ( OrdTable, ordTable )
62−import Rel8.Table.Projection ( Projectable, project )
62+import Rel8.Table.Recontextualize ( Recontextualize )
63−import Rel8.Table.Nullify ( Nullify, aggregateNullify, guard )
63+import Rel8.Table.Tag ( Tag(..), fromExpr, fromName )
64−import Rel8.Table.Serialize ( ToExprs )
65import Rel8.Table.Undefined ( undefined )
64import Rel8.Table.Undefined ( undefined )
66import Rel8.Type ( DBType )
65import Rel8.Type ( DBType )
67−import Rel8.Type.Tag ( MaybeTag( IsJust ) )
66+import Rel8.Type.Tag ( MaybeTag )
68
67
69-- semigroupoids
68-- semigroupoids
70−import Data.Functor.Apply ( Apply, (<.>) )
69+import Data.Functor.Apply ( Apply, (<.>), liftF2 )
71import Data.Functor.Bind ( Bind, (>>-) )
70import Data.Functor.Bind ( Bind, (>>-) )
72
71
73
72
@@ -79,168 +78,158 @@ import Data.Functor.Bind ( Bind, (>>-) )
79-- entirely of nulls, you can't distinguish if you matched an all null row, or
78-- entirely of nulls, you can't distinguish if you matched an all null row, or
80-- if the match failed. For this reason @MaybeTable@ contains an extra field -
79-- if the match failed. For this reason @MaybeTable@ contains an extra field -
81-- a "nullTag" - to track whether or not the outer join produced any rows.
80-- a "nullTag" - to track whether or not the outer join produced any rows.
82−type MaybeTable :: K.Context -> Type -> Type
81+type MaybeTable :: Type -> Type
83−data MaybeTable context a = MaybeTable
82+data MaybeTable a = MaybeTable
84− { tag :: context (Maybe MaybeTag)
83+ { tag :: Tag "isJust" (Maybe MaybeTag)
85− , just :: Nullify context a
84+ , just :: a
86 }
85 }
87 deriving stock Functor
86 deriving stock Functor
88
87
89
88
90−instance Projectable (MaybeTable context) where
89+instance Apply MaybeTable where
91− project f (MaybeTable tag a) = MaybeTable tag (project f a)
90+ MaybeTable tag f <.> MaybeTable tag' a = MaybeTable (tag <> tag') (f a)
92−
93−
94−instance context ~ Expr => Apply (MaybeTable context) where
95− MaybeTable tag f <.> MaybeTable tag' a = MaybeTable (tag <> tag') (f <.> a)
96
91
97
92
98-- | Has the same behavior as the @Applicative@ instance for @Maybe@. See also:
93-- | Has the same behavior as the @Applicative@ instance for @Maybe@. See also:
99−-- 'Rel8.traverseMaybeTable'.
94+-- 'traverseMaybeTable'.
100−instance context ~ Expr => Applicative (MaybeTable context) where
95+instance Applicative MaybeTable where
101 (<*>) = (<.>)
96 (<*>) = (<.>)
102 pure = justTable
97 pure = justTable
103
98
104
99
105−instance context ~ Expr => Bind (MaybeTable context) where
100+instance Bind MaybeTable where
106− MaybeTable tag a >>- f = case f (extract a) of
101+ MaybeTable tag a >>- f = case f a of
107 MaybeTable tag' b -> MaybeTable (tag <> tag') b
102 MaybeTable tag' b -> MaybeTable (tag <> tag') b
108
103
109
104
110−-- | Has the same behavior as the @Monad@ instance for @Maybe@.
105+-- | Has the same behavior as the @Monad@ instance for @Maybe@. See also:
111−instance context ~ Expr => Monad (MaybeTable context) where
106+-- 'bindMaybeTable'.
107+instance Monad MaybeTable where
112 (>>=) = (>>-)
108 (>>=) = (>>-)
113
109
114
110
115−instance context ~ Expr => AltTable (MaybeTable context) where
111+instance AltTable MaybeTable where
116− ma <|>: mb = bool ma mb (isNothingTable ma)
112+ ma@(MaybeTable tag a) <|>: MaybeTable tag' b = MaybeTable
113+ { tag = (tag <> tag')
114+ { expr = boolExpr (expr tag) (expr tag') condition
115+ }
116+ , just = bool a b condition
117+ }
118+ where
119+ condition = isNothingTable ma
117
120
118
121
119−instance context ~ Expr => AlternativeTable (MaybeTable context) where
122+instance AlternativeTable MaybeTable where
120 emptyTable = nothingTable
123 emptyTable = nothingTable
121
124
122
125
123−instance (context ~ Expr, Table Expr a, Semigroup a) =>
126+instance (Table Expr a, Semigroup a) => Semigroup (MaybeTable a) where
124− Semigroup (MaybeTable context a)
125− where
126 ma <> mb = maybeTable mb (\a -> maybeTable ma (justTable . (a <>)) mb) ma
127 ma <> mb = maybeTable mb (\a -> maybeTable ma (justTable . (a <>)) mb) ma
127
128
128
129
129−instance (context ~ Expr, Table Expr a, Semigroup a) =>
130+instance (Table Expr a, Semigroup a) => Monoid (MaybeTable a) where
130− Monoid (MaybeTable context a)
131− where
132 mempty = nothingTable
131 mempty = nothingTable
133
132
134
133
135−instance (Table context a, Reifiable context, context ~ context') =>
134+instance Table1 MaybeTable where
136− Table context' (MaybeTable context a)
135+ type Columns1 MaybeTable = HMaybeTable
137− where
136+ type ConstrainHContext1 MaybeTable = HMaybeNullifiable
138− type Columns (MaybeTable context a) = HMaybeTable (Columns a)
139− type Context (MaybeTable context a) = Context a
140− type FromExprs (MaybeTable context a) = Maybe (FromExprs a)
141− type Transpose to (MaybeTable context a) = MaybeTable to (Transpose to a)
142−
143− toColumns MaybeTable {tag, just} = HMaybeTable
144− { htag = hlabel $ HIdentity tag
145− , hjust = hlabel $ guard tag isJust isNonNull $ toColumns just
146− }
147
137
148− fromColumns HMaybeTable {htag, hjust} = MaybeTable
138+ toColumns1 f MaybeTable {tag, just} = HMaybeTable
149− { tag = unHIdentity $ hunlabel htag
139+ { htag
150− , just = fromColumns $ hunlabel hjust
140+ , hjust = hnullify (hnullifier tag isNonNull) $ f just
151 }
141 }
142+ where
143+ htag = HIdentity (hencodeTag tag)
152
144
153− toResult ma = HMaybeTable
145+ fromColumns1 f HMaybeTable {htag = HIdentity htag, hjust} = MaybeTable
154− { htag = hlabel (HIdentity (Identity (IsJust <$ ma)))
146+ { tag
155− , hjust = hlabel (toResult @_ @(Nullify context a) ma)
147+ , just = f $ runIdentity $
148+ hunnullify (\a -> pure . hunnullifier a) hjust
156 }
149 }
157−
158− fromResult HMaybeTable {htag, hjust} = case hunlabel htag of
159− HIdentity (Identity tag) -> tag $>
160− fromMaybe err (fromResult @_ @(Nullify context a) (hunlabel hjust))
161 where
150 where
162− err = error "Maybe.fromColumns: mismatch between tag and data"
151+ tag = hdecodeTag htag
163
152
153+ {-# INLINABLE fromColumns1 #-}
154+ {-# INLINABLE toColumns1 #-}
164
155
165−instance (EqTable a, context ~ Expr) => EqTable (MaybeTable context a) where
166− eqTable = HMaybeTable
167− { htag = hlabel (HIdentity Dict)
168− , hjust = hlabel (eqTable @(Nullify context a))
169− }
170
156
157+instance
158+ ( Table context a
159+ , Labelable context, Nullifiable context
160+ , ConstrainTag context MaybeTag
161+ ) => Table context (MaybeTable a)
162+ where
163+ type Columns (MaybeTable a) = HMaybeTable (HLabel "Just" (Columns a))
164+ type Context (MaybeTable a) = Context a
165+
166+ toColumns = toColumns1 (hlabel labeler . toColumns)
167+ fromColumns = fromColumns1 (fromColumns . hunlabel unlabeler)
171
168
172−instance (OrdTable a, context ~ Expr) => OrdTable (MaybeTable context a) where
169+
173− ordTable = HMaybeTable
170+instance
174− { htag = hlabel (HIdentity Dict)
171+ ( Labelable from, Nullifiable from, ConstrainTag from MaybeTag
175− , hjust = hlabel (ordTable @(Nullify context a))
172+ , Labelable to, Nullifiable to, ConstrainTag to MaybeTag
176− }
173+ , Recontextualize from to a b
174+ ) => Recontextualize from to (MaybeTable a) (MaybeTable b)
177
175
178
176
179−instance (ToExprs exprs a, context ~ Expr) =>
177+instance EqTable a => EqTable (MaybeTable a) where
180− ToExprs (MaybeTable context exprs) (Maybe a)
178+ eqTable = toColumns1 (hlabel hlabeler) (justTable (eqTable @a))
181
179
182
180
183−-- | Check if a @MaybeTable@ is absent of any row. Like 'Data.Maybe.isNothing'.
181+instance OrdTable a => OrdTable (MaybeTable a) where
184−isNothingTable :: MaybeTable Expr a -> Expr Bool
182+ ordTable = toColumns1 (hlabel hlabeler) (justTable (ordTable @a))
185−isNothingTable (MaybeTable tag _) = isNull tag
186
183
187
184
188−-- | Check if a @MaybeTable@ contains a row. Like 'Data.Maybe.isJust'.
185+-- | Check if a @MaybeTable@ is absent of any row.. Like 'isNothing'.
189−isJustTable :: MaybeTable Expr a -> Expr Bool
186+isNothingTable :: MaybeTable a -> Expr Bool
190−isJustTable (MaybeTable tag _) = isNonNull tag
187+isNothingTable (MaybeTable tag _) = isNull (expr tag)
188+
189+
190+-- | Check if a @MaybeTable@ contains a row. Like 'isJust'.
191+isJustTable :: MaybeTable a -> Expr Bool
192+isJustTable (MaybeTable tag _) = isNonNull (expr tag)
191
193
192
194
193-- | Perform case analysis on a 'MaybeTable'. Like 'maybe'.
195-- | Perform case analysis on a 'MaybeTable'. Like 'maybe'.
194−maybeTable :: Table Expr b => b -> (a -> b) -> MaybeTable Expr a -> b
196+maybeTable :: Table Expr b => b -> (a -> b) -> MaybeTable a -> b
195−maybeTable b f ma@(MaybeTable _ a) = bool (f (extract a)) b (isNothingTable ma)
197+maybeTable b f ma@(MaybeTable _ a) = bool (f a) b (isNothingTable ma)
196{-# INLINABLE maybeTable #-}
198{-# INLINABLE maybeTable #-}
197
199
198
200
199-- | The null table. Like 'Nothing'.
201-- | The null table. Like 'Nothing'.
200−nothingTable :: Table Expr a => MaybeTable Expr a
202+nothingTable :: Table Expr a => MaybeTable a
201−nothingTable = MaybeTable null (pure undefined)
203+nothingTable = MaybeTable (fromExpr null) undefined
202
204
203
205
204-- | Lift any table into 'MaybeTable'. Like 'Just'. Note you can also use
206-- | Lift any table into 'MaybeTable'. Like 'Just'. Note you can also use
205-- 'pure'.
207-- 'pure'.
206−justTable :: a -> MaybeTable Expr a
208+justTable :: a -> MaybeTable a
207−justTable = MaybeTable mempty . pure
209+justTable = MaybeTable (fromExpr mempty)
208−
209−
210−-- | 'Data.Maybe.fromMaybe' for 'MaybeTable's.
211−fromMaybeTable :: Table Expr a => a -> MaybeTable Expr a -> a
212−fromMaybeTable fallback = maybeTable fallback id
213
210
214
211
215-- | Project a single expression out of a 'MaybeTable'. You can think of this
212-- | Project a single expression out of a 'MaybeTable'. You can think of this
216-- operator like the '$' operator, but it also has the ability to return
213-- operator like the '$' operator, but it also has the ability to return
217-- @null@.
214-- @null@.
215+--
216+-- >>> select c $ fmap (fst $?) (optional (values [lit (True, False)]))
217+-- [Just True]
218($?) :: forall a b. Sql DBType b
218($?) :: forall a b. Sql DBType b
219− => (a -> Expr b) -> MaybeTable Expr a -> Expr (N.Nullify b)
219+ => (a -> Expr b) -> MaybeTable a -> Expr (Nullify b)
220−f $? ma@(MaybeTable _ a) = case nullable @b of
220+f $? ma@(MaybeTable _ a) = case nullabilization @b of
221− Null -> boolExpr (f (extract a)) null (isNothingTable ma)
221+ Nullable -> boolExpr (f a) null (isNothingTable ma)
222− NotNull -> boolExpr (nullify (f (extract a))) null (isNothingTable ma)
222+ NonNullable -> boolExpr (nullify (f a)) null (isNothingTable ma)
223infixl 4 $?
223infixl 4 $?
224
224
225
225
226−-- | Lift an aggregating function to operate on a 'MaybeTable'.
227−-- @nothingTable@s and @justTable@s are grouped separately.
228aggregateMaybeTable :: ()
226aggregateMaybeTable :: ()
229− => (exprs -> aggregates)
227+ => (a -> Aggregate b) -> MaybeTable a -> Aggregate (MaybeTable b)
230− -> MaybeTable Expr exprs
228+aggregateMaybeTable f MaybeTable {tag = tag@Tag {aggregator, expr}, just} =
231− -> MaybeTable Aggregate aggregates
229+ liftF2 MaybeTable (tag <$ aggregate) (f just)
232−aggregateMaybeTable f (MaybeTable tag a) =
230+ where
233− MaybeTable (groupByExpr tag) (aggregateNullify f a)
231+ aggregate = unsafeMakeAggregate toPrimExpr fromPrimExpr aggregator expr
234−
232+
235−
233+
236−-- | Construct a 'MaybeTable' in the 'Name' context. This can be useful if you
234+nameMaybeTable :: Name (Maybe MaybeTag) -> a -> MaybeTable a
237−-- have a 'MaybeTable' that you are storing in a table and need to construct a
235+nameMaybeTable = MaybeTable . fromName
238−-- 'TableSchema'.
239−nameMaybeTable
240− :: Name (Maybe MaybeTag)
241− -- ^ The name of the column to track whether a row is a 'justTable' or
242− -- 'nothingTable'.
243− -> a
244− -- ^ Names of the columns in @a@.
245− -> MaybeTable Name a
246−nameMaybeTable tag = MaybeTable tag . pure
src/Rel8/Table/Name.hs+22−37
@@ -1,17 +1,14 @@
1−{-# language DataKinds #-}
2{-# language FlexibleContexts #-}
1{-# language FlexibleContexts #-}
3−{-# language FlexibleInstances #-}
4−{-# language MultiParamTypeClasses #-}
5{-# language NamedFieldPuns #-}
2{-# language NamedFieldPuns #-}
6{-# language ScopedTypeVariables #-}
3{-# language ScopedTypeVariables #-}
7{-# language TypeApplications #-}
4{-# language TypeApplications #-}
8{-# language TypeFamilies #-}
5{-# language TypeFamilies #-}
9−{-# language UndecidableInstances #-}
10{-# language ViewPatterns #-}
6{-# language ViewPatterns #-}
11
7
12module Rel8.Table.Name
8module Rel8.Table.Name
13 ( namesFromLabels
9 ( namesFromLabels
14 , namesFromLabelsWith
10 , namesFromLabelsWith
11+ , showExprs
15 , showLabels
12 , showLabels
16 , showNames
13 , showNames
17 )
14 )
@@ -20,60 +17,48 @@ where
20-- base
17-- base
21import Data.Foldable ( fold )
18import Data.Foldable ( fold )
22import Data.Functor.Const ( Const( Const ), getConst )
19import Data.Functor.Const ( Const( Const ), getConst )
23−import Data.List.NonEmpty ( NonEmpty, intersperse, nonEmpty )
20+import Data.List.NonEmpty ( NonEmpty, intersperse )
24−import Data.Maybe ( fromMaybe )
25import Prelude
21import Prelude
26
22
23+-- casing
24+import Text.Casing ( quietSnake )
25+
27-- rel8
26-- rel8
27+import Rel8.Expr ( Expr, Col(..) )
28+import Rel8.Kind.Labels ( renderLabels )
28import Rel8.Schema.HTable ( htabulate, htabulateA, hfield, hspecs )
29import Rel8.Schema.HTable ( htabulate, htabulateA, hfield, hspecs )
29−import Rel8.Schema.Name ( Name( Name ) )
30+import Rel8.Schema.Name ( Name, Col(..) )
30−import Rel8.Schema.Spec ( Spec(..) )
31+import Rel8.Schema.Spec ( SSpec(..) )
31−import Rel8.Table ( Table(..) )
32+import Rel8.Table ( Table, Columns, Context, fromColumns, toColumns )
32
33
33
34
34−-- | Construct a table in the 'Name' context containing the names of all
35−-- columns. Nested column names will be combined with @/@.
36−--
37−-- See also: 'namesFromLabelsWith'.
38namesFromLabels :: Table Name a => a
35namesFromLabels :: Table Name a => a
39namesFromLabels = namesFromLabelsWith go
36namesFromLabels = namesFromLabelsWith go
40 where
37 where
41− go = fold . intersperse "/"
38+ go = fold . intersperse "/" . fmap quietSnake
42
39
43
40
44−-- | Construct a table in the 'Name' context containing the names of all
45−-- columns. The supplied function can be used to transform column names.
46−--
47−-- This function can be used to generically derive the columns for a
48−-- 'TableSchema'. For example,
49−--
50−-- @
51−-- myTableSchema :: TableSchema (MyTable Name)
52−-- myTableSchema = TableSchema
53−-- { columns = namesFromLabelsWith last
54−-- }
55−-- @
56−--
57−-- will construct a 'TableSchema' where each columns names exactly corresponds
58−-- to the name of the Haskell field.
59namesFromLabelsWith :: Table Name a
41namesFromLabelsWith :: Table Name a
60 => (NonEmpty String -> String) -> a
42 => (NonEmpty String -> String) -> a
61namesFromLabelsWith f = fromColumns $ htabulate $ \field ->
43namesFromLabelsWith f = fromColumns $ htabulate $ \field ->
62 case hfield hspecs field of
44 case hfield hspecs field of
63− Spec {labels} -> Name (f (renderLabels labels))
45+ SSpec {labels} -> NameCol (f (renderLabels labels))
46+
47+
48+showExprs :: Table Expr a => a -> [(String, String)]
49+showExprs as = case (namesFromLabels, toColumns as) of
50+ (names, exprs) -> getConst $ htabulateA $ \field ->
51+ case (hfield names field, hfield exprs field) of
52+ (NameCol name, DB expr) -> Const [(name, show expr)]
64
53
65
54
66showLabels :: forall a. Table (Context a) a => a -> [NonEmpty String]
55showLabels :: forall a. Table (Context a) a => a -> [NonEmpty String]
67showLabels _ = getConst $
56showLabels _ = getConst $
68 htabulateA @(Columns a) $ \field -> case hfield hspecs field of
57 htabulateA @(Columns a) $ \field -> case hfield hspecs field of
69− Spec {labels} -> Const (pure (renderLabels labels))
58+ SSpec {labels} -> Const [renderLabels labels]
70
59
71
60
72−showNames :: forall a. Table Name a => a -> NonEmpty String
61+showNames :: forall a. Table Name a => a -> [String]
73showNames (toColumns -> names) = getConst $
62showNames (toColumns -> names) = getConst $
74 htabulateA @(Columns a) $ \field -> case hfield names field of
63 htabulateA @(Columns a) $ \field -> case hfield names field of
75− Name name -> Const (pure name)
64+ NameCol name -> Const [name]
76−
77−
78−renderLabels :: [String] -> NonEmpty String
79−renderLabels labels = fromMaybe (pure "anon") (nonEmpty labels )
src/Rel8/Table/NonEmpty.hs+35−86
@@ -1,4 +1,3 @@
1−{-# language DataKinds #-}
2{-# language FlexibleContexts #-}
1{-# language FlexibleContexts #-}
3{-# language FlexibleInstances #-}
2{-# language FlexibleInstances #-}
4{-# language MultiParamTypeClasses #-}
3{-# language MultiParamTypeClasses #-}
@@ -11,9 +10,8 @@
11
10
12module Rel8.Table.NonEmpty
11module Rel8.Table.NonEmpty
13 ( NonEmptyTable(..)
12 ( NonEmptyTable(..)
14− , ($+)
13+ , HNonEmptyTable
15 , nonEmptyTable
14 , nonEmptyTable
16− , nameNonEmptyTable
17 )
15 )
18where
16where
19
17
@@ -21,123 +19,74 @@ where
21import Data.Functor.Identity ( Identity( Identity ) )
19import Data.Functor.Identity ( Identity( Identity ) )
22import Data.Kind ( Type )
20import Data.Kind ( Type )
23import Data.List.NonEmpty ( NonEmpty )
21import Data.List.NonEmpty ( NonEmpty )
24−import Prelude hiding ( id )
22+import Prelude
25
23
26-- rel8
24-- rel8
27−import Rel8.Expr ( Expr )
25+import Rel8.Expr ( Expr, Col(..) )
28import Rel8.Expr.Array ( sappend1, snonEmptyOf )
26import Rel8.Expr.Array ( sappend1, snonEmptyOf )
29import Rel8.Schema.Dict ( Dict( Dict ) )
27import Rel8.Schema.Dict ( Dict( Dict ) )
30import Rel8.Schema.HTable.NonEmpty ( HNonEmptyTable )
28import Rel8.Schema.HTable.NonEmpty ( HNonEmptyTable )
31−import Rel8.Schema.HTable.Vectorize
29+import Rel8.Schema.HTable.Vectorize ( happend, hvectorize )
32− ( hvectorize, hunvectorize
30+import Rel8.Schema.Nullability ( Nullability( Nullable, NonNullable ) )
33− , happend
31+import Rel8.Schema.Spec ( SSpec(..) )
34− , hproject, hcolumn
32+import Rel8.Schema.Spec.ConstrainDBType ( dbTypeDict, dbTypeNullability )
35− )
33+import Rel8.Table ( Table, Context, Columns, fromColumns, toColumns )
36−import qualified Rel8.Schema.Kind as K
37−import Rel8.Schema.Name ( Name( Name ) )
38−import Rel8.Schema.Null ( Nullity( Null, NotNull ) )
39−import Rel8.Schema.Result ( vectorizer, unvectorizer )
40−import Rel8.Schema.Spec ( Spec(..) )
41−import Rel8.Table
42− ( Table, Context, Columns, fromColumns, toColumns
43− , FromExprs, fromResult, toResult
44− , Transpose
45− )
46import Rel8.Table.Alternative ( AltTable, (<|>:) )
34import Rel8.Table.Alternative ( AltTable, (<|>:) )
47import Rel8.Table.Eq ( EqTable, eqTable )
35import Rel8.Table.Eq ( EqTable, eqTable )
48import Rel8.Table.Ord ( OrdTable, ordTable )
36import Rel8.Table.Ord ( OrdTable, ordTable )
49−import Rel8.Table.Projection
37+import Rel8.Table.Recontextualize ( Recontextualize )
50− ( Projectable, Projecting, Projection, project, apply
51− )
52−import Rel8.Table.Serialize ( ToExprs )
53
38
54
39
55-- | A @NonEmptyTable@ value contains one or more instances of @a@. You
40-- | A @NonEmptyTable@ value contains one or more instances of @a@. You
56−-- construct @NonEmptyTable@s with 'Rel8.some' or 'nonEmptyAgg'.
41+-- construct @NonEmptyTable@s with 'some' or 'nonEmptyAgg'.
57−type NonEmptyTable :: K.Context -> Type -> Type
42+type NonEmptyTable :: Type -> Type
58−newtype NonEmptyTable context a =
43+newtype NonEmptyTable a =
59− NonEmptyTable (HNonEmptyTable (Columns a) (Context a))
44+ NonEmptyTable (HNonEmptyTable (Columns a) (Col (Context a)))
60−
61
45
62−instance Projectable (NonEmptyTable context) where
63− project f (NonEmptyTable a) = NonEmptyTable (hproject (apply f) a)
64
46
65−
47+instance Table context a => Table context (NonEmptyTable a) where
66−instance (Table context a, context ~ context') =>
48+ type Columns (NonEmptyTable a) = HNonEmptyTable (Columns a)
67− Table context' (NonEmptyTable context a)
49+ type Context (NonEmptyTable a) = Context a
68− where
69− type Columns (NonEmptyTable context a) = HNonEmptyTable (Columns a)
70− type Context (NonEmptyTable context a) = Context a
71− type FromExprs (NonEmptyTable context a) = NonEmpty (FromExprs a)
72− type Transpose to (NonEmptyTable context a) =
73− NonEmptyTable to (Transpose to a)
74
50
75 fromColumns = NonEmptyTable
51 fromColumns = NonEmptyTable
76 toColumns (NonEmptyTable a) = a
52 toColumns (NonEmptyTable a) = a
77− fromResult = fmap (fromResult @_ @a) . hunvectorize unvectorizer
78− toResult = hvectorize vectorizer . fmap (toResult @_ @a)
79
53
80
54
81−instance (EqTable a, context ~ Expr) =>
55+instance Recontextualize from to a b =>
82− EqTable (NonEmptyTable context a)
56+ Recontextualize from to (NonEmptyTable a) (NonEmptyTable b)
83− where
57+
58+
59+instance EqTable a => EqTable (NonEmptyTable a) where
84 eqTable =
60 eqTable =
85 hvectorize
61 hvectorize
86− (\Spec {nullity} (Identity Dict) -> case nullity of
62+ (\SSpec {} (Identity dict) -> case dbTypeDict dict of
87− Null -> Dict
63+ Dict -> case dbTypeNullability dict of
88− NotNull -> Dict)
64+ Nullable -> Dict
65+ NonNullable -> Dict)
89 (Identity (eqTable @a))
66 (Identity (eqTable @a))
90
67
91
68
92−instance (OrdTable a, context ~ Expr) =>
69+instance OrdTable a => OrdTable (NonEmptyTable a) where
93− OrdTable (NonEmptyTable context a)
94− where
95 ordTable =
70 ordTable =
96 hvectorize
71 hvectorize
97− (\Spec {nullity} (Identity Dict) -> case nullity of
72+ (\SSpec {} (Identity dict) -> case dbTypeDict dict of
98− Null -> Dict
73+ Dict -> case dbTypeNullability dict of
99− NotNull -> Dict)
74+ Nullable -> Dict
75+ NonNullable -> Dict)
100 (Identity (ordTable @a))
76 (Identity (ordTable @a))
101
77
102
78
103−instance (ToExprs exprs a, context ~ Expr) =>
79+instance AltTable NonEmptyTable where
104− ToExprs (NonEmptyTable context exprs) (NonEmpty a)
105−
106−
107−instance context ~ Expr => AltTable (NonEmptyTable context) where
108 (<|>:) = (<>)
80 (<|>:) = (<>)
109
81
110
82
111−instance (Table Expr a, context ~ Expr) => Semigroup (NonEmptyTable context a)
83+instance Table Expr a => Semigroup (NonEmptyTable a) where
112− where
113 NonEmptyTable as <> NonEmptyTable bs = NonEmptyTable $
84 NonEmptyTable as <> NonEmptyTable bs = NonEmptyTable $
114− happend (const sappend1) as bs
85+ happend (\_ _ (DB a) (DB b) -> DB (sappend1 a b)) as bs
115−
116−
117−-- | Project a single expression out of a 'NonEmptyTable'.
118−($+) :: Projecting a (Expr b)
119− => Projection a (Expr b) -> NonEmptyTable Expr a -> Expr (NonEmpty b)
120−f $+ NonEmptyTable a = hcolumn $ hproject (apply f) a
121−infixl 4 $+
122
86
123
87
124−-- | Construct a @NonEmptyTable@ from a non-empty list of expressions.
88+nonEmptyTable :: Table Expr a => NonEmpty a -> NonEmptyTable a
125−nonEmptyTable :: Table Expr a => NonEmpty a -> NonEmptyTable Expr a
126nonEmptyTable =
89nonEmptyTable =
127 NonEmptyTable .
90 NonEmptyTable .
128− hvectorize (\Spec {info} -> snonEmptyOf info) .
91+ hvectorize (\SSpec {info} -> DB . snonEmptyOf info . fmap unDB) .
129 fmap toColumns
92 fmap toColumns
130−
131−
132−-- | Construct a 'NonEmptyTable' in the 'Name' context. This can be useful if
133−-- you have a 'NonEmptyTable' that you are storing in a table and need to
134−-- construct a 'TableSchema'.
135−nameNonEmptyTable
136− :: Table Name a
137− => a -- ^ The names of the columns of elements of the list.
138− -> NonEmptyTable Name a
139−nameNonEmptyTable =
140− NonEmptyTable .
141− hvectorize (\_ (Identity (Name a)) -> Name a) .
142− pure .
143− toColumns
src/Rel8/Table/Null.hsdeleted−147
@@ -1,147 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language FlexibleContexts #-}
3−{-# language FlexibleInstances #-}
4−{-# language MultiParamTypeClasses #-}
5−{-# language ScopedTypeVariables #-}
6−{-# language StandaloneKindSignatures #-}
7−{-# language TypeApplications #-}
8−{-# language TypeFamilies #-}
9−{-# language UndecidableInstances #-}
10−
11−module Rel8.Table.Null
12− ( NullTable(..)
13− , nullableTable, nullTable, nullifyTable, unsafeUnnullifyTable
14− , isNullTable, isNonNullTable
15− , nameNullTable
16− , toMaybeTable, toNullTable
17− )
18−where
19−
20−-- base
21−import Data.Kind ( Type )
22−import Prelude hiding ( null, undefined )
23−
24−-- comonad
25−import Control.Comonad ( extract )
26−
27−-- rel8
28−import Rel8.Expr ( Expr )
29−import Rel8.Expr.Bool ( not_ )
30−import Rel8.Kind.Context ( Reifiable )
31−import qualified Rel8.Schema.Kind as K
32−import Rel8.Schema.Name ( Name )
33−import Rel8.Table
34− ( Table, Columns, Context, fromColumns, toColumns
35− , FromExprs, fromResult, toResult
36− , Transpose
37− )
38−import Rel8.Table.Alternative
39− ( AltTable, (<|>:)
40− , AlternativeTable, emptyTable
41− )
42−import Rel8.Table.Bool ( bool )
43−import Rel8.Table.Eq ( EqTable, eqTable )
44−import Rel8.Table.Maybe ( MaybeTable, justTable, maybeTable, nothingTable )
45−import Rel8.Table.Nullify ( Nullify, isNull )
46−import Rel8.Table.Ord ( OrdTable, ordTable )
47−import Rel8.Table.Projection ( Projectable, project )
48−import Rel8.Table.Serialize ( ToExprs )
49−import Rel8.Table.Undefined ( undefined )
50−
51−
52−-- | @NullTable t@ is the table @t@, but where all the columns in @t@ have the
53−-- possibility of being 'Rel8.null'. This is very similar to
54−-- 'Rel8.MaybeTable', except that it does not use an extra tag field, so it
55−-- cannot distinguish between @Nothing@ and @Just Nothing@ if nested. In other
56−-- words, if all of the columns of the @t@ passed to @NullTable@ are already
57−-- nullable, then @NullTable@ has no effect.
58−type NullTable :: K.Context -> Type -> Type
59−newtype NullTable context a = NullTable (Nullify context a)
60−
61−
62−instance Projectable (NullTable context) where
63− project f (NullTable a) = NullTable (project f a)
64−
65−
66−instance context ~ Expr => AltTable (NullTable context) where
67− ma <|>: mb = bool ma mb (isNullTable ma)
68−
69−
70−instance context ~ Expr => AlternativeTable (NullTable context) where
71− emptyTable = nullTable
72−
73−
74−instance (Table context a, Reifiable context, context ~ context') =>
75− Table context' (NullTable context a)
76− where
77− type Columns (NullTable context a) = Columns (Nullify context a)
78− type Context (NullTable context a) = Context (Nullify context a)
79− type FromExprs (NullTable context a) = FromExprs (Nullify context a)
80− type Transpose to (NullTable context a) = NullTable to (Transpose to a)
81−
82− toColumns (NullTable a) = toColumns a
83− fromColumns = NullTable . fromColumns
84−
85− toResult = toResult @_ @(Nullify context a)
86− fromResult = fromResult @_ @(Nullify context a)
87−
88−
89−instance (EqTable a, context ~ Expr) => EqTable (NullTable context a) where
90− eqTable = eqTable @(Nullify context a)
91−
92−
93−instance (OrdTable a, context ~ Expr) => OrdTable (NullTable context a) where
94− ordTable = ordTable @(Nullify context a)
95−
96−
97−instance (ToExprs exprs a, context ~ Expr) =>
98− ToExprs (NullTable context exprs) (Maybe a)
99−
100−
101−-- | Check if any of the non-nullable fields of @a@ are 'Rel8.null' under the
102−-- 'NullTable'. Returns 'Rel8.false' if @a@ has no non-nullable fields.
103−isNullTable :: Table Expr a => NullTable Expr a -> Expr Bool
104−isNullTable (NullTable a) = isNull a
105−
106−
107−-- | The inverse of 'isNullTable'.
108−isNonNullTable :: Table Expr a => NullTable Expr a -> Expr Bool
109−isNonNullTable = not_ . isNullTable
110−
111−
112−-- | Like 'Rel8.nullable'.
113−nullableTable :: (Table Expr a, Table Expr b)
114− => b -> (a -> b) -> NullTable Expr a -> b
115−nullableTable b f ma@(NullTable a) = bool (f (extract a)) b (isNullTable ma)
116−
117−
118−-- | The null table. Like 'Rel8.null'.
119−nullTable :: Table Expr a => NullTable Expr a
120−nullTable = NullTable (pure undefined)
121−
122−
123−-- | Lift any table into 'NullTable'. Like 'Rel8.nullify'.
124−nullifyTable :: a -> NullTable Expr a
125−nullifyTable = NullTable . pure
126−
127−
128−unsafeUnnullifyTable :: NullTable Expr a -> a
129−unsafeUnnullifyTable (NullTable a) = extract a
130−
131−
132−-- | Construct a 'NullTable' in the 'Name' context. This can be useful if you
133−-- have a 'NullTable' that you are storing in a table and need to construct a
134−-- 'TableSchema'.
135−nameNullTable :: a -> NullTable Name a
136−nameNullTable = NullTable . pure
137−
138−
139−-- | Convert a 'NullTable' to a 'MaybeTable'.
140−toMaybeTable :: Table Expr a => NullTable Expr a -> MaybeTable Expr a
141−toMaybeTable = nullableTable nothingTable justTable
142−
143−
144−-- | Convert a 'MaybeTable' to a 'NullTable'. Note that if the underlying @a@
145−-- has no non-nullable fields, this is a lossy conversion.
146−toNullTable :: Table Expr a => MaybeTable Expr a -> NullTable Expr a
147−toNullTable = maybeTable nullTable nullifyTable
src/Rel8/Table/Nullify.hsdeleted−211
@@ -1,211 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language FlexibleContexts #-}
3−{-# language FlexibleInstances #-}
4−{-# language LambdaCase #-}
5−{-# language MultiParamTypeClasses #-}
6−{-# language NamedFieldPuns #-}
7−{-# language ScopedTypeVariables #-}
8−{-# language StandaloneKindSignatures #-}
9−{-# language TypeApplications #-}
10−{-# language TypeFamilies #-}
11−{-# language UndecidableInstances #-}
12−
13−module Rel8.Table.Nullify
14− ( Nullify
15− , aggregateNullify
16− , guard
17− , isNull
18− )
19−where
20−
21−-- base
22−import Control.Applicative ( liftA2 )
23−import Data.Functor.Const ( Const( Const ), getConst )
24−import Data.Functor.Identity ( runIdentity )
25−import Data.Kind ( Type )
26−import Prelude
27−
28−-- comonad
29−import Control.Comonad ( Comonad, duplicate, extract, ComonadApply, (<@>) )
30−
31−-- rel8
32−import Rel8.Aggregate ( Aggregate )
33−import Rel8.Expr ( Expr )
34−import Rel8.Expr.Bool ( (||.), false )
35−import qualified Rel8.Expr.Null as Expr
36−import Rel8.Kind.Context ( Reifiable, contextSing )
37−import Rel8.Schema.Context.Nullify
38− ( Nullifiability( NAggregate, NExpr )
39− , NonNullifiability
40− , Nullifiable, nullifiability
41− , nullifiableOrNot, absurd
42− , guarder
43− , nullifier
44− , unnullifier
45− )
46−import Rel8.Schema.Dict ( Dict( Dict ) )
47−import Rel8.Schema.HTable ( HTable )
48−import Rel8.Schema.HTable.Nullify
49− ( HNullify, hnulls, hnullify, hunnullify
50− , hguard
51− , hproject
52− )
53−import qualified Rel8.Schema.Kind as K
54−import Rel8.Schema.Null ( Nullity( NotNull, Null ) )
55−import qualified Rel8.Schema.Result as R
56−import Rel8.Table
57− ( Table, Columns, Context, toColumns, fromColumns
58− , FromExprs, fromResult, toResult
59− , Transpose
60− )
61−import Rel8.Schema.Spec ( Spec( Spec, nullity ) )
62−import Rel8.Table.Eq ( EqTable, eqTable )
63−import Rel8.Table.Ord ( OrdTable, ordTable )
64−import Rel8.Table.Projection ( Projectable, apply, project )
65−
66−-- semigroupoids
67−import Data.Functor.Apply ( Apply, (<.>), liftF2 )
68−import Data.Functor.Bind ( Bind, (>>-) )
69−import Data.Functor.Extend ( Extend, duplicated )
70−
71−
72−type Nullify :: K.Context -> Type -> Type
73−data Nullify context a
74− = Table (Nullifiability context) a
75− | Fields (NonNullifiability context) (HNullify (Columns a) (Context a))
76−
77−
78−instance Projectable (Nullify context) where
79− project f = \case
80− Table nullifiable a -> Table nullifiable (fromColumns (apply f (toColumns a)))
81− Fields nonNullifiable a -> Fields nonNullifiable (hproject (apply f) a)
82−
83−
84−instance Nullifiable context => Functor (Nullify context) where
85− fmap f = \case
86− Table nullifiable a -> Table nullifiable (f a)
87− Fields notNullifiable _ -> absurd nullifiability notNullifiable
88−
89−
90−instance Nullifiable context => Foldable (Nullify context) where
91− foldMap f = \case
92− Table _ a -> f a
93− Fields notNullifiable _ -> absurd nullifiability notNullifiable
94−
95−
96−instance Nullifiable context => Traversable (Nullify context) where
97− traverse f = \case
98− Table nullifiable a -> Table nullifiable <$> f a
99− Fields notNullifiable _ -> absurd nullifiability notNullifiable
100−
101−
102−instance Nullifiable context => Apply (Nullify context) where
103− liftF2 f = \case
104− Table nullifiable a -> \case
105− Table _ b -> Table nullifiable (f a b)
106− Fields notNullifiable _ -> absurd nullifiable notNullifiable
107− Fields notNullifiable _ -> absurd nullifiability notNullifiable
108−
109−
110−instance Nullifiable context => Applicative (Nullify context) where
111− pure = Table nullifiability
112− liftA2 = liftF2
113−
114−
115−instance Nullifiable context => Bind (Nullify context) where
116− Table _ a >>- f = f a
117− Fields notNullifiable _ >>- _ = absurd nullifiability notNullifiable
118−
119−
120−instance Nullifiable context => Monad (Nullify context) where
121− (>>=) = (>>-)
122−
123−
124−instance Nullifiable context => Extend (Nullify context) where
125− duplicated = \case
126− Table nullifiable a -> Table nullifiable (Table nullifiable a)
127− Fields notNullifiable _ -> absurd nullifiability notNullifiable
128−
129−
130−instance Nullifiable context => Comonad (Nullify context) where
131− extract = \case
132− Table _ a -> a
133− Fields notNullifiable _ -> absurd nullifiability notNullifiable
134− duplicate = duplicated
135−
136−
137−instance Nullifiable context => ComonadApply (Nullify context) where
138− (<@>) = (<.>)
139−
140−
141−instance (Table context a, Reifiable context, context ~ context') =>
142− Table context' (Nullify context a)
143− where
144− type Columns (Nullify context a) = HNullify (Columns a)
145− type Context (Nullify context a) = Context a
146− type FromExprs (Nullify context a) = Maybe (FromExprs a)
147− type Transpose to (Nullify context a) = Nullify to (Transpose to a)
148−
149− fromColumns = case nullifiableOrNot contextSing of
150− Left notNullifiable -> Fields notNullifiable
151− Right nullifiable ->
152− Table nullifiable .
153− fromColumns .
154− runIdentity .
155− hunnullify (\spec -> pure . unnullifier nullifiable spec)
156−
157− toColumns = \case
158− Table nullifiable a -> hnullify (nullifier nullifiable) (toColumns a)
159− Fields _ a -> a
160−
161− fromResult = fmap (fromResult @_ @a) . hunnullify R.unnullifier
162−
163− toResult =
164− maybe (hnulls (const R.null)) (hnullify R.nullifier) .
165− fmap (toResult @_ @a)
166−
167−
168−instance (EqTable a, context ~ Expr) => EqTable (Nullify context a) where
169− eqTable = hnullify (\_ Dict -> Dict) (eqTable @a)
170−
171−
172−instance (OrdTable a, context ~ Expr) => OrdTable (Nullify context a) where
173− ordTable = hnullify (\_ Dict -> Dict) (ordTable @a)
174−
175−
176−aggregateNullify :: ()
177− => (exprs -> aggregates)
178− -> Nullify Expr exprs
179− -> Nullify Aggregate aggregates
180−aggregateNullify f = \case
181− Table _ a -> Table NAggregate (f a)
182− Fields notNullifiable _ -> absurd NExpr notNullifiable
183−
184−
185−guard :: (Reifiable context, HTable t)
186− => context tag
187− -> (tag -> Bool)
188− -> (Expr tag -> Expr Bool)
189− -> HNullify t context
190− -> HNullify t context
191−guard tag isNonNull isNonNullExpr =
192− hguard (guarder contextSing tag isNonNull isNonNullExpr)
193−
194−
195−isNull :: forall a. Table Expr a => Nullify Expr a -> Expr Bool
196−isNull =
197− maybe false getAny .
198− getConst .
199− hunnullify (\Spec {nullity} a -> Const $ case nullity of
200− NotNull -> Just $ Any $ Expr.isNull a
201− Null -> Nothing) .
202− toColumns
203−
204−
205−newtype Any = Any
206− { getAny :: Expr Bool
207− }
208−
209−
210−instance Semigroup Any where
211− Any a <> Any b = Any (a ||. b)
src/Rel8/Table/Opaleye.hs+70−93
@@ -1,150 +1,127 @@
1−{-# language BlockArguments #-}
2−{-# language DataKinds #-}
3{-# language DisambiguateRecordFields #-}
1{-# language DisambiguateRecordFields #-}
4{-# language FlexibleContexts #-}
2{-# language FlexibleContexts #-}
5{-# language NamedFieldPuns #-}
3{-# language NamedFieldPuns #-}
6−{-# language RankNTypes #-}
7{-# language TypeFamilies #-}
4{-# language TypeFamilies #-}
8{-# language ViewPatterns #-}
5{-# language ViewPatterns #-}
9
6
10−{-# options_ghc -Wno-deprecations #-}
11−
12module Rel8.Table.Opaleye
7module Rel8.Table.Opaleye
13 ( aggregator
8 ( aggregator
14− , attributes
15 , binaryspec
9 , binaryspec
16 , distinctspec
10 , distinctspec
17− , exprs
18− , exprsWithNames
19 , table
11 , table
20 , tableFields
12 , tableFields
21 , unpackspec
13 , unpackspec
22 , valuesspec
14 , valuesspec
23− , view
24− , castTable
25 )
15 )
26where
16where
27
17
28-- base
18-- base
29−import Data.Functor.Const ( Const( Const ), getConst )
19+import Prelude hiding ( undefined )
30−import Data.List.NonEmpty ( NonEmpty )
31−import Prelude
32
20
33-- opaleye
21-- opaleye
34−import qualified Opaleye.Adaptors as Opaleye
35−import qualified Opaleye.Field as Opaleye ( Field_ )
36import qualified Opaleye.Internal.Aggregate as Opaleye
22import qualified Opaleye.Internal.Aggregate as Opaleye
23+import qualified Opaleye.Internal.Binary as Opaleye
24+import qualified Opaleye.Internal.Distinct as Opaleye
37import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
25import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
26+import qualified Opaleye.Internal.PackMap as Opaleye
27+import qualified Opaleye.Internal.Unpackspec as Opaleye
38import qualified Opaleye.Internal.Values as Opaleye
28import qualified Opaleye.Internal.Values as Opaleye
39−import qualified Opaleye.Table as Opaleye
29+import qualified Opaleye.Internal.Table as Opaleye
40
30
41-- profunctors
31-- profunctors
42import Data.Profunctor ( dimap, lmap )
32import Data.Profunctor ( dimap, lmap )
43
33
44-- rel8
34-- rel8
45−import Rel8.Aggregate ( Aggregate( Aggregate ), Aggregates )
35+import Rel8.Aggregate ( Aggregate( Aggregate ) )
46−import Rel8.Expr ( Expr )
36+import Rel8.Expr ( Expr, Col(..) )
47import Rel8.Expr.Opaleye
37import Rel8.Expr.Opaleye
48− ( fromPrimExpr, toPrimExpr
38+ ( scastExpr
49− , scastExpr, traverseFieldP
39+ , fromPrimExpr, toPrimExpr
40+ , traversePrimExpr
41+ , fromColumn, toColumn
50 )
42 )
51−import Rel8.Schema.HTable ( htabulateA, hfield, hspecs, htabulate,
43+import Rel8.Kind.Necessity ( SNecessity( SRequired, SOptional ) )
52− htraverseP, htraversePWithField )
44+import Rel8.Schema.HTable ( htabulateA, hfield, htraverse, hspecs )
53−import Rel8.Schema.Name ( Name( Name ), Selects, ppColumn )
45+import Rel8.Schema.Insert ( Insert, Inserts, Col(..) )
54−import Rel8.Schema.Spec ( Spec(..) )
46+import Rel8.Schema.Name ( Name, Selects, Col(..) )
55−import Rel8.Schema.Table ( TableSchema(..), ppTable )
47+import Rel8.Schema.Spec ( SSpec(..) )
48+import Rel8.Schema.Table ( TableSchema(..) )
56import Rel8.Table ( Table, fromColumns, toColumns )
49import Rel8.Table ( Table, fromColumns, toColumns )
57−import Rel8.Type.Information ( typeName )
50+import Rel8.Table.Undefined ( undefined )
58
51
59-- semigroupoids
52-- semigroupoids
60import Data.Functor.Apply ( WrappedApplicative(..) )
53import Data.Functor.Apply ( WrappedApplicative(..) )
61−import Data.Profunctor.Product ( ProductProfunctor )
62−
63−
64−aggregator :: Aggregates aggregates exprs => Opaleye.Aggregator aggregates exprs
65−aggregator = dimap toColumns fromColumns $
66− htraverseP $
67− lmap (\(Aggregate a) -> (a, ())) Opaleye.aggregatorApply
68−
69
54
70−attributes :: Selects names exprs => TableSchema names -> exprs
71−attributes schema@TableSchema {columns} = fromColumns $ htabulate $ \field ->
72− case hfield (toColumns columns) field of
73− Name column -> fromPrimExpr $ Opaleye.ConstExpr $
74− Opaleye.OtherLit $
75− show (ppTable schema) <> "." <> show (ppColumn column)
76
55
77−
56+aggregator :: Opaleye.Aggregator (Aggregate exprs) exprs
78−fromOpaleyespec :: (ProductProfunctor p, Table Expr a)
57+aggregator = Opaleye.Aggregator $ Opaleye.PackMap $
79− => p (Opaleye.Field_ n x) (Opaleye.Field_ n x)
58+ \f (Aggregate (Opaleye.Aggregator (Opaleye.PackMap inner))) -> inner f ()
80− -> p a a
81−fromOpaleyespec x =
82− dimap toColumns fromColumns (htraverseP (traverseFieldP x))
83
59
84
60
85binaryspec :: Table Expr a => Opaleye.Binaryspec a a
61binaryspec :: Table Expr a => Opaleye.Binaryspec a a
86−binaryspec = fromOpaleyespec Opaleye.binaryspecField
62+binaryspec = Opaleye.Binaryspec $ Opaleye.PackMap $ \f (as, bs) ->
63+ fmap fromColumns $ unwrapApplicative $ htabulateA $ \field ->
64+ WrapApplicative $
65+ case (hfield (toColumns as) field, hfield (toColumns bs) field) of
66+ (DB a, DB b) -> DB . fromPrimExpr <$> f (toPrimExpr a, toPrimExpr b)
87
67
88
68
89distinctspec :: Table Expr a => Opaleye.Distinctspec a a
69distinctspec :: Table Expr a => Opaleye.Distinctspec a a
90−distinctspec = fromOpaleyespec Opaleye.distinctspecField
70+distinctspec =
91−
71+ Opaleye.Distinctspec $ Opaleye.Aggregator $ Opaleye.PackMap $ \f ->
92−
72+ fmap fromColumns .
93−exprs :: Table Expr a => a -> NonEmpty Opaleye.PrimExpr
73+ unwrapApplicative .
94−exprs (toColumns -> as) = getConst $ htabulateA $ \field ->
74+ htraverse
95− case hfield as field of
75+ (\(DB a) ->
96− expr -> Const (pure (toPrimExpr expr))
76+ WrapApplicative $ DB . fromPrimExpr <$> f (Nothing, toPrimExpr a)) .
97−
77+ toColumns
98−
78+
99−exprsWithNames :: Selects names exprs
79+
100− => names -> exprs -> NonEmpty (String, Opaleye.PrimExpr)
80+table ::(Selects names exprs, Inserts exprs inserts)
101−exprsWithNames names as = getConst $ htabulateA $ \field ->
81+ => TableSchema names -> Opaleye.Table inserts exprs
102− case (hfield (toColumns names) field, hfield (toColumns as) field) of
103− (Name name, expr) -> Const (pure (name, toPrimExpr expr))
104−
105−
106−table :: Selects names exprs => TableSchema names -> Opaleye.Table exprs exprs
107table (TableSchema name schema columns) =
82table (TableSchema name schema columns) =
108 case schema of
83 case schema of
109− Nothing -> Opaleye.table name (tableFields columns)
84+ Nothing -> Opaleye.Table name (tableFields columns)
110− Just schemaName -> Opaleye.tableWithSchema schemaName name (tableFields columns)
85+ Just schemaName -> Opaleye.TableWithSchema schemaName name (tableFields columns)
111
86
112
87
113−tableFields :: Selects names exprs
88+tableFields :: (Selects names exprs, Inserts exprs inserts)
114− => names -> Opaleye.TableFields exprs exprs
89+ => names -> Opaleye.TableFields inserts exprs
115tableFields (toColumns -> names) = dimap toColumns fromColumns $
90tableFields (toColumns -> names) = dimap toColumns fromColumns $
116 unwrapApplicative $ htabulateA $ \field -> WrapApplicative $
91 unwrapApplicative $ htabulateA $ \field -> WrapApplicative $
117− case hfield names field of
92+ case hfield hspecs field of
118− name -> lmap (`hfield` field) (go name)
93+ specs -> case hfield names field of
94+ name -> lmap (`hfield` field) (go specs name)
119 where
95 where
120− go :: Name a -> Opaleye.TableFields (Expr a) (Expr a)
96+ go :: SSpec spec -> Col Name spec -> Opaleye.TableFields (Col Insert spec) (Col Expr spec)
121− go (Name name) =
97+ go SSpec {necessity, info} (NameCol name) = case necessity of
122− traverseFieldP $
98+ SRequired ->
123− Opaleye.requiredTableField name
99+ lmap (\(RequiredInsert a) -> toColumn $ toPrimExpr a) $
100+ DB . scastExpr info . fromPrimExpr . fromColumn <$>
101+ Opaleye.requiredTableField name
102+ SOptional ->
103+ lmap (\(OptionalInsert ma) -> toColumn . toPrimExpr <$> ma) $
104+ DB . scastExpr info . fromPrimExpr . fromColumn <$>
105+ Opaleye.optionalTableField name
124
106
125
107
126unpackspec :: Table Expr a => Opaleye.Unpackspec a a
108unpackspec :: Table Expr a => Opaleye.Unpackspec a a
127−unpackspec = fromOpaleyespec Opaleye.unpackspecField
109+unpackspec = Opaleye.Unpackspec $ Opaleye.PackMap $ \f ->
110+ fmap fromColumns .
111+ unwrapApplicative .
112+ htraverse (\(DB a) -> WrapApplicative $ DB <$> traversePrimExpr f a) .
113+ toColumns
128{-# INLINABLE unpackspec #-}
114{-# INLINABLE unpackspec #-}
129
115
130
116
131−valuesspec :: Table Expr a => Opaleye.Valuesspec a a
117+valuesspec :: Table Expr a => Opaleye.ValuesspecSafe a a
132−valuesspec = dimap toColumns fromColumns $
118+valuesspec = Opaleye.ValuesspecSafe (toPackMap undefined) unpackspec
133− htraversePWithField (traverseFieldP . Opaleye.valuesspecFieldType . typeName)
134− where typeName = Rel8.Type.Information.typeName . info . hfield hspecs
135−
136−
137−view :: Selects names exprs => names -> exprs
138−view columns = fromColumns $ htabulate $ \field ->
139− case hfield (toColumns columns) field of
140− Name column -> fromPrimExpr $ Opaleye.BaseTableAttrExpr column
141
119
142
120
143−-- | Transform a table by adding 'CAST' to all columns. This is most useful for
121+toPackMap :: Table Expr a
144−-- finalising a SELECT or RETURNING statement, guaranteed that the output
122+ => a -> Opaleye.PackMap Opaleye.PrimExpr Opaleye.PrimExpr () a
145−-- matches what is encoded in each columns TypeInformation.
123+toPackMap as = Opaleye.PackMap $ \f () ->
146−castTable :: Table Expr a => a -> a
124+ fmap fromColumns $
147−castTable (toColumns -> as) = fromColumns $ htabulate \field ->
125+ unwrapApplicative .
148− case hfield hspecs field of
126+ htraverse (\(DB a) -> WrapApplicative $ DB <$> traversePrimExpr f a) $
149− Spec {info} -> case hfield as field of
127+ toColumns as
150− expr -> scastExpr info expr
src/Rel8/Table/Ord.hs+73−45
@@ -2,14 +2,14 @@
2{-# language DataKinds #-}
2{-# language DataKinds #-}
3{-# language DefaultSignatures #-}
3{-# language DefaultSignatures #-}
4{-# language DisambiguateRecordFields #-}
4{-# language DisambiguateRecordFields #-}
5−{-# language FlexibleContexts #-}
6{-# language FlexibleInstances #-}
5{-# language FlexibleInstances #-}
6+{-# language NamedFieldPuns #-}
7{-# language ScopedTypeVariables #-}
7{-# language ScopedTypeVariables #-}
8{-# language StandaloneKindSignatures #-}
8{-# language StandaloneKindSignatures #-}
9{-# language TypeApplications #-}
9{-# language TypeApplications #-}
10{-# language TypeFamilies #-}
10{-# language TypeFamilies #-}
11−{-# language TypeOperators #-}
12{-# language UndecidableInstances #-}
11{-# language UndecidableInstances #-}
12+{-# language UndecidableSuperClasses #-}
13{-# language ViewPatterns #-}
13{-# language ViewPatterns #-}
14
14
15module Rel8.Table.Ord
15module Rel8.Table.Ord
@@ -20,25 +20,31 @@ where
20-- base
20-- base
21import Data.Functor.Const ( Const( Const ), getConst )
21import Data.Functor.Const ( Const( Const ), getConst )
22import Data.Kind ( Constraint, Type )
22import Data.Kind ( Constraint, Type )
23−import GHC.Generics ( Rep )
24import Prelude hiding ( seq )
23import Prelude hiding ( seq )
25
24
26-- rel8
25-- rel8
27−import Rel8.Expr ( Expr )
26+import Rel8.Expr ( Expr, Col(..) )
28import Rel8.Expr.Bool ( (||.), (&&.), false, true )
27import Rel8.Expr.Bool ( (||.), (&&.), false, true )
29import Rel8.Expr.Eq ( (==.) )
28import Rel8.Expr.Eq ( (==.) )
30import Rel8.Expr.Ord ( (<.), (>.) )
29import Rel8.Expr.Ord ( (<.), (>.) )
31−import Rel8.FCF ( Eval, Exp )
30+import Rel8.Schema.Context.Label ( hlabeler )
32−import Rel8.Generic.Record ( Record )
33−import Rel8.Generic.Table.Record ( GTable, GColumns, gtable )
34import Rel8.Schema.Dict ( Dict( Dict ) )
31import Rel8.Schema.Dict ( Dict( Dict ) )
35−import Rel8.Schema.HTable ( htabulateA, hfield )
32+import Rel8.Schema.HTable
36−import Rel8.Schema.HTable.Identity ( HIdentity( HIdentity ) )
33+ ( HTable, HConstrainTable
37−import Rel8.Schema.Null (Sql)
34+ , htabulateA, hfield, hdicts
38−import Rel8.Table ( Columns, toColumns, TColumns )
35+ )
36+import Rel8.Schema.HTable.Label ( hlabel )
37+import Rel8.Schema.HTable.Pair ( HPair(..) )
38+import Rel8.Schema.HTable.Quartet ( HQuartet(..) )
39+import Rel8.Schema.HTable.Quintet ( HQuintet(..) )
40+import Rel8.Schema.HTable.Trio ( HTrio(..) )
41+import Rel8.Schema.Spec.ConstrainDBType ( ConstrainDBType )
42+import Rel8.Table ( Table, Columns, toColumns )
39import Rel8.Table.Bool ( bool )
43import Rel8.Table.Bool ( bool )
40import Rel8.Table.Eq ( EqTable )
44import Rel8.Table.Eq ( EqTable )
45+import Rel8.Type.Eq ( DBEq )
41import Rel8.Type.Ord ( DBOrd )
46import Rel8.Type.Ord ( DBOrd )
47+import Rel8.Schema.Nullability (Sql)
42
48
43
49
44-- | The class of 'Table's that can be ordered. Ordering on tables is defined
50-- | The class of 'Table's that can be ordered. Ordering on tables is defined
@@ -46,50 +52,72 @@ import Rel8.Type.Ord ( DBOrd )
46-- columns in a 'Table' have an instance of 'DBOrd'".
52-- columns in a 'Table' have an instance of 'DBOrd'".
47type OrdTable :: Type -> Constraint
53type OrdTable :: Type -> Constraint
48class EqTable a => OrdTable a where
54class EqTable a => OrdTable a where
49− ordTable :: Columns a (Dict (Sql DBOrd))
55+ ordTable :: Columns a (Dict (ConstrainDBType DBOrd))
56+
57+ default ordTable :: HConstrainTable (Columns a) (ConstrainDBType DBOrd) => Columns a (Dict (ConstrainDBType DBOrd))
58+ ordTable = hdicts @(Columns a) @(ConstrainDBType DBOrd)
50
59
51− default ordTable ::
60+
52− ( GTable TOrdTable TColumns (Rep (Record a))
61+instance
53− , Columns a ~ GColumns TColumns (Rep (Record a))
62+ ( Table Expr (t Expr)
54− )
63+ , f ~ Expr
55− => Columns a (Dict (Sql DBOrd))
64+ , HConstrainTable (Columns (t Expr)) (ConstrainDBType DBEq)
56− ordTable = gtable @TOrdTable @TColumns @(Rep (Record a)) table
65+ , HConstrainTable (Columns (t Expr)) (ConstrainDBType DBOrd)
57− where
66+ )
58− table (_ :: proxy x) = ordTable @x
67+ => OrdTable (t f)
59
68
60
69
61−data TOrdTable :: Type -> Exp Constraint
70+instance
62−type instance Eval (TOrdTable a) = OrdTable a
71+ ( HTable t
72+ , f ~ Col Expr
73+ , HConstrainTable t (ConstrainDBType DBEq)
74+ , HConstrainTable t (ConstrainDBType DBOrd)
75+ )
76+ => OrdTable (t f)
63
77
64
78
65−instance Sql DBOrd a => OrdTable (Expr a) where
79+instance Sql DBOrd a => OrdTable (Expr a)
66− ordTable = HIdentity Dict
67
80
68
81
69−instance (OrdTable a, OrdTable b) => OrdTable (a, b)
82+instance (OrdTable a, OrdTable b) => OrdTable (a, b) where
83+ ordTable =
84+ HPair
85+ { hfst = hlabel hlabeler (ordTable @a)
86+ , hsnd = hlabel hlabeler (ordTable @b)
87+ }
70
88
71
89
72−instance (OrdTable a, OrdTable b, OrdTable c) => OrdTable (a, b, c)
90+instance (OrdTable a, OrdTable b, OrdTable c) => OrdTable (a, b, c) where
91+ ordTable =
92+ HTrio
93+ { hfst = hlabel hlabeler (ordTable @a)
94+ , hsnd = hlabel hlabeler (ordTable @b)
95+ , htrd = hlabel hlabeler (ordTable @c)
96+ }
73
97
74
98
75instance (OrdTable a, OrdTable b, OrdTable c, OrdTable d) => OrdTable (a, b, c, d)
99instance (OrdTable a, OrdTable b, OrdTable c, OrdTable d) => OrdTable (a, b, c, d)
100+ where
101+ ordTable =
102+ HQuartet
103+ { hfst = hlabel hlabeler (ordTable @a)
104+ , hsnd = hlabel hlabeler (ordTable @b)
105+ , htrd = hlabel hlabeler (ordTable @c)
106+ , hfrt = hlabel hlabeler (ordTable @d)
107+ }
76
108
77
109
78instance (OrdTable a, OrdTable b, OrdTable c, OrdTable d, OrdTable e) =>
110instance (OrdTable a, OrdTable b, OrdTable c, OrdTable d, OrdTable e) =>
79 OrdTable (a, b, c, d, e)
111 OrdTable (a, b, c, d, e)
80−
112+ where
81−
113+ ordTable =
82−instance
114+ HQuintet
83− ( OrdTable a, OrdTable b, OrdTable c, OrdTable d, OrdTable e, OrdTable f
115+ { hfst = hlabel hlabeler (ordTable @a)
84− )
116+ , hsnd = hlabel hlabeler (ordTable @b)
85− => OrdTable (a, b, c, d, e, f)
117+ , htrd = hlabel hlabeler (ordTable @c)
86−
118+ , hfrt = hlabel hlabeler (ordTable @d)
87−
119+ , hfft = hlabel hlabeler (ordTable @e)
88−instance
120+ }
89− ( OrdTable a, OrdTable b, OrdTable c, OrdTable d, OrdTable e, OrdTable f
90− , OrdTable g
91− )
92− => OrdTable (a, b, c, d, e, f, g)
93
121
94
122
95-- | Test if one 'Table' sorts before another. Corresponds to comparing all
123-- | Test if one 'Table' sorts before another. Corresponds to comparing all
@@ -98,7 +126,7 @@ instance
98(toColumns -> as) <: (toColumns -> bs) =
126(toColumns -> as) <: (toColumns -> bs) =
99 foldr @[] go false $ getConst $ htabulateA $ \field ->
127 foldr @[] go false $ getConst $ htabulateA $ \field ->
100 case (hfield as field, hfield bs field) of
128 case (hfield as field, hfield bs field) of
101− (a, b) -> case hfield (ordTable @a) field of
129+ (DB a, DB b) -> case hfield (ordTable @a) field of
102 Dict -> Const [(a <. b, a ==. b)]
130 Dict -> Const [(a <. b, a ==. b)]
103 where
131 where
104 go (lt, eq) a = lt ||. (eq &&. a)
132 go (lt, eq) a = lt ||. (eq &&. a)
@@ -111,7 +139,7 @@ infix 4 <:
111(toColumns -> as) <=: (toColumns -> bs) =
139(toColumns -> as) <=: (toColumns -> bs) =
112 foldr @[] go true $ getConst $ htabulateA $ \field ->
140 foldr @[] go true $ getConst $ htabulateA $ \field ->
113 case (hfield as field, hfield bs field) of
141 case (hfield as field, hfield bs field) of
114− (a, b) -> case hfield (ordTable @a) field of
142+ (DB a, DB b) -> case hfield (ordTable @a) field of
115 Dict -> Const [(a <. b, a ==. b)]
143 Dict -> Const [(a <. b, a ==. b)]
116 where
144 where
117 go (lt, eq) a = lt ||. (eq &&. a)
145 go (lt, eq) a = lt ||. (eq &&. a)
@@ -124,7 +152,7 @@ infix 4 <=:
124(toColumns -> as) >: (toColumns -> bs) =
152(toColumns -> as) >: (toColumns -> bs) =
125 foldr @[] go false $ getConst $ htabulateA $ \field ->
153 foldr @[] go false $ getConst $ htabulateA $ \field ->
126 case (hfield as field, hfield bs field) of
154 case (hfield as field, hfield bs field) of
127− (a, b) -> case hfield (ordTable @a) field of
155+ (DB a, DB b) -> case hfield (ordTable @a) field of
128 Dict -> Const [(a >. b, a ==. b)]
156 Dict -> Const [(a >. b, a ==. b)]
129 where
157 where
130 go (gt, eq) a = gt ||. (eq &&. a)
158 go (gt, eq) a = gt ||. (eq &&. a)
@@ -137,7 +165,7 @@ infix 4 >:
137(toColumns -> as) >=: (toColumns -> bs) =
165(toColumns -> as) >=: (toColumns -> bs) =
138 foldr @[] go true $ getConst $ htabulateA $ \field ->
166 foldr @[] go true $ getConst $ htabulateA $ \field ->
139 case (hfield as field, hfield bs field) of
167 case (hfield as field, hfield bs field) of
140− (a, b) -> case hfield (ordTable @a) field of
168+ (DB a, DB b) -> case hfield (ordTable @a) field of
141 Dict -> Const [(a >. b, a ==. b)]
169 Dict -> Const [(a >. b, a ==. b)]
142 where
170 where
143 go (gt, eq) a = gt ||. (eq &&. a)
171 go (gt, eq) a = gt ||. (eq &&. a)
@@ -146,9 +174,9 @@ infix 4 >=:
146
174
147-- | Given two 'Table's, return the table that sorts before the other.
175-- | Given two 'Table's, return the table that sorts before the other.
148least :: OrdTable a => a -> a -> a
176least :: OrdTable a => a -> a -> a
149−least a b = bool b a (a <: b)
177+least a b = bool a b (a <: b)
150
178
151
179
152-- | Given two 'Table's, return the table that sorts after the other.
180-- | Given two 'Table's, return the table that sorts after the other.
153greatest :: OrdTable a => a -> a -> a
181greatest :: OrdTable a => a -> a -> a
154−greatest a b = bool b a (a >: b)
182+greatest a b = bool a b (a >: b)
src/Rel8/Table/Order.hs+18−14
@@ -16,14 +16,16 @@ import Data.Functor.Contravariant ( (>$<), contramap )
16import Prelude
16import Prelude
17
17
18-- rel8
18-- rel8
19+import Rel8.Expr ( unDB )
19import Rel8.Expr.Order ( asc, desc, nullsFirst, nullsLast )
20import Rel8.Expr.Order ( asc, desc, nullsFirst, nullsLast )
20import Rel8.Order ( Order )
21import Rel8.Order ( Order )
21import Rel8.Schema.Dict ( Dict( Dict ) )
22import Rel8.Schema.Dict ( Dict( Dict ) )
22import Rel8.Schema.HTable (htabulateA, hfield, hspecs)
23import Rel8.Schema.HTable (htabulateA, hfield, hspecs)
23−import Rel8.Schema.Null ( Nullity( Null, NotNull ) )
24+import Rel8.Schema.Nullability ( Nullability( Nullable, NonNullable ) )
24−import Rel8.Schema.Spec ( Spec( Spec, nullity ) )
25+import Rel8.Schema.Spec ( SSpec( SSpec ) )
25−import Rel8.Table ( Columns, toColumns )
26+import Rel8.Schema.Spec.ConstrainDBType ( dbTypeDict, dbTypeNullability )
26−import Rel8.Table.Ord ( OrdTable, ordTable )
27+import Rel8.Table
28+import Rel8.Table.Ord
27
29
28
30
29-- | Construct an 'Order' for a 'Table' by sorting all columns into ascending
31-- | Construct an 'Order' for a 'Table' by sorting all columns into ascending
@@ -31,11 +33,12 @@ import Rel8.Table.Ord ( OrdTable, ordTable )
31ascTable :: forall a. OrdTable a => Order a
33ascTable :: forall a. OrdTable a => Order a
32ascTable = contramap toColumns $ getConst $
34ascTable = contramap toColumns $ getConst $
33 htabulateA @(Columns a) $ \field -> case hfield hspecs field of
35 htabulateA @(Columns a) $ \field -> case hfield hspecs field of
34− Spec {nullity} -> case hfield (ordTable @a) field of
36+ SSpec {} -> case hfield (ordTable @a) field of
35− Dict -> Const $ (`hfield` field) >$<
37+ dict@Dict -> case dbTypeDict dict of
36− case nullity of
38+ Dict -> Const $ unDB . (`hfield` field) >$<
37− Null -> nullsFirst asc
39+ case dbTypeNullability dict of
38− NotNull -> asc
40+ Nullable -> nullsFirst asc
41+ NonNullable -> asc
39
42
40
43
41-- | Construct an 'Order' for a 'Table' by sorting all columns into descending
44-- | Construct an 'Order' for a 'Table' by sorting all columns into descending
@@ -43,8 +46,9 @@ ascTable = contramap toColumns $ getConst $
43descTable :: forall a. OrdTable a => Order a
46descTable :: forall a. OrdTable a => Order a
44descTable = contramap toColumns $ getConst $
47descTable = contramap toColumns $ getConst $
45 htabulateA @(Columns a) $ \field -> case hfield hspecs field of
48 htabulateA @(Columns a) $ \field -> case hfield hspecs field of
46− Spec {nullity} -> case hfield (ordTable @a) field of
49+ SSpec {} -> case hfield (ordTable @a) field of
47− Dict -> Const $ (`hfield` field) >$<
50+ dict@Dict -> case dbTypeDict dict of
48− case nullity of
51+ Dict -> Const $ unDB . (`hfield` field) >$<
49− Null -> nullsLast desc
52+ case dbTypeNullability dict of
50− NotNull -> desc
53+ Nullable -> nullsLast desc
54+ NonNullable -> desc
src/Rel8/Table/Projection.hsdeleted−73
@@ -1,73 +0,0 @@
1−{-# language FlexibleContexts #-}
2−{-# language FlexibleInstances #-}
3−{-# language MonoLocalBinds #-}
4−{-# language MultiParamTypeClasses #-}
5−{-# language StandaloneKindSignatures #-}
6−{-# language UndecidableInstances #-}
7−
8−module Rel8.Table.Projection
9− ( Projection
10− , Projectable( project )
11− , Biprojectable( biproject )
12− , Projecting
13− , apply
14− )
15−where
16−
17−-- base
18−import Data.Kind ( Constraint, Type )
19−import Prelude
20−
21−-- rel8
22−import Rel8.Schema.Field ( Field( Field ), fields )
23−import Rel8.Schema.HTable ( hfield, htabulate )
24−import Rel8.Table ( Columns, Context, Transpose, toColumns )
25−import Rel8.Table.Transpose ( Transposes )
26−
27−
28−-- | The constraint @'Projecting' a b@ ensures that @'Projection' a b@ is a
29−-- usable 'Projection'.
30−type Projecting :: Type -> Type -> Constraint
31−class
32− ( Transposes (Context a) (Field a) a (Transpose (Field a) a)
33− , Transposes (Context a) (Field a) b (Transpose (Field a) b)
34− )
35− => Projecting a b
36−instance
37− ( Transposes (Context a) (Field a) a (Transpose (Field a) a)
38− , Transposes (Context a) (Field a) b (Transpose (Field a) b)
39− )
40− => Projecting a b
41−
42−
43−-- | A @'Projection' a b@s is a special type of function @a -> b@ whereby the
44−-- resulting @b@ is guaranteed to be composed only from columns contained in
45−-- @a@.
46−type Projection :: Type -> Type -> Type
47−type Projection a b = Transpose (Field a) a -> Transpose (Field a) b
48−
49−
50−-- | @'Projectable' f@ means that @f@ is a kind of functor on 'Rel8.Table's
51−-- that allows the mapping of a 'Projection' over its underlying columns.
52−type Projectable :: (Type -> Type) -> Constraint
53−class Projectable f where
54− -- | Map a 'Projection' over @f@.
55− project :: Projecting a b
56− => Projection a b -> f a -> f b
57−
58−
59−-- | @'Biprojectable' p@ means that @p@ is a kind of bifunctor on
60−-- 'Rel8.Table's that allows the mapping of a pair of 'Projection's over its
61−-- underlying columns.
62−type Biprojectable :: (Type -> Type -> Type) -> Constraint
63−class Biprojectable p where
64− -- | Map a pair of 'Projection's over @p@.
65− biproject :: (Projecting a b, Projecting c d)
66− => Projection a b -> Projection c d -> p a c -> p b d
67−
68−
69−apply :: Projecting a b
70− => Projection a b -> Columns a context -> Columns b context
71−apply f a = case toColumns (f fields) of
72− bs -> htabulate $ \field -> case hfield bs field of
73− Field field' -> hfield a field'
src/Rel8/Table/Recontextualize.hsnew file+133
@@ -0,0 +1,133 @@
1+{-# language DataKinds #-}
2+{-# language FlexibleInstances #-}
3+{-# language FunctionalDependencies #-}
4+{-# language StandaloneKindSignatures #-}
5+{-# language TypeFamilies #-}
6+{-# language UndecidableInstances #-}
7+{-# language UndecidableSuperClasses #-}
8+
9+module Rel8.Table.Recontextualize
10+ ( Recontextualize
11+ )
12+where
13+
14+-- base
15+import Data.Functor.Identity ( Identity )
16+import Data.Kind ( Constraint, Type )
17+import Prelude ()
18+
19+-- rel8
20+import Rel8.Opaque ( Opaque )
21+import Rel8.Schema.Context ( Col )
22+import Rel8.Schema.Context.Label ( Labelable )
23+import Rel8.Schema.HTable ( HTable )
24+import qualified Rel8.Schema.Kind as K
25+import Rel8.Schema.Nullability ( Sql )
26+import Rel8.Schema.Spec ( KnownSpec )
27+import Rel8.Table ( Table, Congruent )
28+import Rel8.Type ( DBType )
29+
30+
31+type Recontextualize :: K.Context -> K.Context -> Type -> Type -> Constraint
32+class
33+ ( Table from a
34+ , Table to b
35+ , Congruent a b
36+ , Recontextualize from from a a
37+ , Recontextualize to to b b
38+ , Recontextualize to from b a
39+ ) => Recontextualize from to a b
40+ | a -> from
41+ , b -> to
42+ , a to -> b
43+ , b from -> a
44+
45+
46+instance KnownSpec spec =>
47+ Recontextualize from to (Col from spec) (Col to spec)
48+
49+
50+{-
51+instance Sql DBType a =>
52+ Recontextualize Aggregate Insertion (Aggregate (Expr a)) (Insertion a)
53+
54+
55+instance Sql DBType a => Recontextualize Expr Insertion (Expr a) (Insertion a)
56+-}
57+
58+
59+instance Sql DBType a => Recontextualize Identity Identity (Identity a) (Identity a)
60+
61+
62+{-
63+instance Sql DBType a =>
64+ Recontextualize Identity Insertion (Identity a) (Insertion a)
65+
66+
67+instance Sql DBType a =>
68+ Recontextualize Insertion Aggregate (Insertion a) (Aggregate (Expr a))
69+
70+
71+instance Sql DBType a => Recontextualize Insertion Expr (Insertion a) (Expr a)
72+
73+
74+instance Sql DBType a =>
75+ Recontextualize Insertion Identity (Insertion a) (Identity a)
76+
77+
78+instance Sql DBType a => Recontextualize Insertion Insertion (Insertion a) (Insertion a)
79+
80+
81+instance Sql DBType a => Recontextualize Insertion Name (Insertion a) (Name a)
82+
83+
84+instance Sql DBType a => Recontextualize Name Insertion (Name a) (Insertion a)
85+-}
86+
87+
88+instance Recontextualize from to (Opaque from a) (Opaque to a)
89+
90+
91+instance HTable t => Recontextualize from to (t (Col from)) (t (Col to))
92+
93+
94+instance
95+ ( Table from (t from)
96+ , Table to (t to)
97+ , Congruent (t from) (t to)
98+ ) => Recontextualize from to (t from) (t to)
99+
100+
101+instance
102+ ( Recontextualize from to a1 b1
103+ , Recontextualize from to a2 b2
104+ , Labelable from
105+ , Labelable to
106+ ) => Recontextualize from to (a1, a2) (b1, b2)
107+
108+
109+instance
110+ ( Recontextualize from to a1 b1
111+ , Recontextualize from to a2 b2
112+ , Recontextualize from to a3 b3
113+ , Labelable from, Labelable to
114+ ) => Recontextualize from to (a1, a2, a3) (b1, b2, b3)
115+
116+
117+instance
118+ ( Recontextualize from to a1 b1
119+ , Recontextualize from to a2 b2
120+ , Recontextualize from to a3 b3
121+ , Recontextualize from to a4 b4
122+ , Labelable from, Labelable to
123+ ) => Recontextualize from to (a1, a2, a3, a4) (b1, b2, b3, b4)
124+
125+
126+instance
127+ ( Recontextualize from to a1 b1
128+ , Recontextualize from to a2 b2
129+ , Recontextualize from to a3 b3
130+ , Recontextualize from to a4 b4
131+ , Recontextualize from to a5 b5
132+ , Labelable from, Labelable to
133+ ) => Recontextualize from to (a1, a2, a3, a4, a5) (b1, b2, b3, b4, b5)
src/Rel8/Table/Rel8able.hsdeleted−92
@@ -1,92 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language FlexibleInstances #-}
3−{-# language MultiParamTypeClasses #-}
4−{-# language ScopedTypeVariables #-}
5−{-# language StandaloneKindSignatures #-}
6−{-# language TypeApplications #-}
7−{-# language TypeFamilies #-}
8−{-# language UndecidableInstances #-}
9−
10−{-# options_ghc -fno-warn-orphans #-}
11−
12−module Rel8.Table.Rel8able
13− (
14− )
15−where
16−
17−-- base
18−import Prelude ()
19−
20−-- rel8
21−import Rel8.Expr ( Expr )
22−import qualified Rel8.Kind.Algebra as K
23−import Rel8.Kind.Context ( Reifiable, contextSing )
24−import Rel8.Generic.Rel8able
25− ( Rel8able, Algebra
26− , GColumns, gfromColumns, gtoColumns
27− , GFromExprs, gfromResult, gtoResult
28− )
29−import qualified Rel8.Schema.Kind as K
30−import Rel8.Schema.HTable ( HConstrainTable, hdicts )
31−import Rel8.Schema.Null ( Sql )
32−import Rel8.Schema.Result ( Result )
33−import Rel8.Table
34− ( Table, Columns, Context, fromColumns, toColumns
35− , FromExprs, fromResult, toResult
36− , Transpose
37− )
38−import Rel8.Table.ADT ( ADT )
39−import Rel8.Table.Eq ( EqTable, eqTable )
40−import Rel8.Table.Ord ( OrdTable, ordTable )
41−import Rel8.Table.Serialize ( ToExprs )
42−import Rel8.Type.Eq ( DBEq )
43−import Rel8.Type.Ord ( DBOrd )
44−
45−
46−instance (Rel8able t, Reifiable context, context ~ context') =>
47− Table context' (t context)
48− where
49− type Columns (t context) = GColumns t
50− type Context (t context) = context
51− type FromExprs (t context) = GFromExprs t
52− type Transpose to (t context) = t to
53−
54− fromColumns = gfromColumns contextSing
55− toColumns = gtoColumns contextSing
56− fromResult = gfromResult @t
57− toResult = gtoResult @t
58−
59−
60−instance
61− ( context ~ Expr
62− , Rel8able t
63− , HConstrainTable (Columns (t context)) (Sql DBEq)
64− )
65− => EqTable (t context)
66− where
67− eqTable = hdicts @(Columns (t context)) @(Sql DBEq)
68−
69−
70−instance
71− ( context ~ Expr
72− , Rel8able t
73− , HConstrainTable (Columns (t context)) (Sql DBEq)
74− , HConstrainTable (Columns (t context)) (Sql DBOrd)
75− )
76− => OrdTable (t context)
77− where
78− ordTable = hdicts @(Columns (t context)) @(Sql DBOrd)
79−
80−
81−instance
82− ( Rel8able t', t' ~ Choose (Algebra t) t
83− , x ~ t' Expr
84− , result ~ Result
85− )
86− => ToExprs x (t result)
87−
88−
89−type Choose :: K.Algebra -> K.Rel8able -> K.Rel8able
90−type family Choose algebra t where
91− Choose 'K.Sum t = ADT t
92− Choose 'K.Product t = t
src/Rel8/Table/Serialize.hs+270−71
@@ -1,4 +1,6 @@
1{-# language AllowAmbiguousTypes #-}
1{-# language AllowAmbiguousTypes #-}
2+{-# language DataKinds #-}
3+{-# language DisambiguateRecordFields #-}
2{-# language FlexibleContexts #-}
4{-# language FlexibleContexts #-}
3{-# language FlexibleInstances #-}
5{-# language FlexibleInstances #-}
4{-# language FunctionalDependencies #-}
6{-# language FunctionalDependencies #-}
@@ -7,16 +9,18 @@
7{-# language StandaloneKindSignatures #-}
9{-# language StandaloneKindSignatures #-}
8{-# language TypeApplications #-}
10{-# language TypeApplications #-}
9{-# language TypeFamilies #-}
11{-# language TypeFamilies #-}
12+{-# language ViewPatterns #-}
10{-# language UndecidableInstances #-}
13{-# language UndecidableInstances #-}
11
14
12module Rel8.Table.Serialize
15module Rel8.Table.Serialize
13− ( Serializable, lit, litHTable, parse
16+ ( Serializable, lit, parse
14− , ToExprs
17+ , Encodes, litTable
15 )
18 )
16where
19where
17
20
18-- base
21-- base
19−import Data.Functor.Identity ( Identity( Identity ) )
22+import Data.Bifunctor ( bimap )
23+import Data.Functor.Identity ( Identity )
20import Data.Kind ( Constraint, Type )
24import Data.Kind ( Constraint, Type )
21import Data.List.NonEmpty ( NonEmpty )
25import Data.List.NonEmpty ( NonEmpty )
22import Prelude
26import Prelude
@@ -25,124 +29,319 @@ import Prelude
25import qualified Hasql.Decoders as Hasql
29import qualified Hasql.Decoders as Hasql
26
30
27-- rel8
31-- rel8
28−import Rel8.Expr ( Expr )
32+import Rel8.Expr ( Expr, Col(..) )
29import Rel8.Expr.Serialize ( slitExpr, sparseValue )
33import Rel8.Expr.Serialize ( slitExpr, sparseValue )
34+import Rel8.Schema.Context ( Col(..) )
35+import Rel8.Schema.Context.Identity
36+ ( fromHEitherTable, toHEitherTable
37+ , fromHListTable, toHListTable
38+ , fromHMaybeTable, toHMaybeTable
39+ , fromHNonEmptyTable, toHNonEmptyTable
40+ , fromHTheseTable, toHTheseTable
41+ )
42+import Rel8.Schema.Context.Label ( labeler, unlabeler )
30import Rel8.Schema.HTable ( HTable, htabulate, htabulateA, hfield, hspecs )
43import Rel8.Schema.HTable ( HTable, htabulate, htabulateA, hfield, hspecs )
31−import Rel8.Schema.Null ( NotNull, Sql )
44+import Rel8.Schema.HTable.Label ( hlabel, hunlabel )
32−import Rel8.Schema.Result ( Result )
45+import Rel8.Schema.HTable.Quartet ( HQuartet(..) )
33−import Rel8.Schema.Spec ( Spec(..) )
46+import Rel8.Schema.HTable.Quintet ( HQuintet(..) )
34−import Rel8.Table ( Table, fromColumns, FromExprs, fromResult, toResult )
47+import Rel8.Schema.HTable.Pair ( HPair(..) )
48+import Rel8.Schema.HTable.Trio ( HTrio(..) )
49+import Rel8.Schema.HTable.Type ( HType(..) )
50+import Rel8.Schema.Nullability ( NotNull, Sql )
51+import Rel8.Schema.Spec ( SSpec(..), KnownSpec )
52+import Rel8.Table ( Table, Columns, fromColumns, toColumns )
53+import Rel8.Table.Either ( EitherTable )
54+import Rel8.Table.List ( ListTable )
55+import Rel8.Table.Maybe ( MaybeTable )
56+import Rel8.Table.NonEmpty ( NonEmptyTable )
57+import Rel8.Table.Recontextualize ( Recontextualize )
58+import Rel8.Table.These ( TheseTable )
35import Rel8.Type ( DBType )
59import Rel8.Type ( DBType )
36
60
37-- semigroupoids
61-- semigroupoids
38import Data.Functor.Apply ( WrappedApplicative(..) )
62import Data.Functor.Apply ( WrappedApplicative(..) )
39
63
64+-- these
65+import Data.These ( These )
66+
67+
68+fromIdentity' :: forall exprs a. ToExprs a exprs => Columns exprs (Col Identity) -> a
69+fromIdentity' = fromIdentity @_ @exprs
70+
71+
72+toIdentity' :: forall exprs a. ToExprs a exprs => a -> Columns exprs (Col Identity)
73+toIdentity' = toIdentity @_ @exprs
74+
40
75
41−-- | @ToExprs exprs a@ is evidence that the types @exprs@ and @a@ describe
42−-- essentially the same type, but @exprs@ is in the 'Expr' context, and @a@ is
43−-- a normal Haskell type.
44type ToExprs :: Type -> Type -> Constraint
76type ToExprs :: Type -> Type -> Constraint
45−class Table Expr exprs => ToExprs exprs a
77+class Table Expr exprs => ToExprs a exprs where
78+ fromIdentity :: Columns exprs (Col Identity) -> a
79+ toIdentity :: a -> Columns exprs (Col Identity)
46
80
47
81
48−instance {-# OVERLAPPABLE #-} (Sql DBType a, x ~ Expr a) => ToExprs x a
82+instance {-# OVERLAPPABLE #-} (Sql DBType a, x ~ Expr a) => ToExprs a x where
83+ fromIdentity (HType (Result a)) = a
84+ toIdentity = HType . Result
49
85
50
86
51−instance (Sql DBType a, x ~ [a]) => ToExprs (Expr x) [a]
87+instance (Sql DBType a, x ~ [a]) => ToExprs [a] (Expr x) where
88+ fromIdentity (HType (Result a)) = a
89+ toIdentity = HType . Result
52
90
53
91
54−instance (Sql DBType a, NotNull a, x ~ Maybe a) => ToExprs (Expr x) (Maybe a)
92+instance (Sql DBType a, NotNull a, x ~ Maybe a) => ToExprs (Maybe a) (Expr x)
93+ where
94+ fromIdentity (HType (Result a)) = a
95+ toIdentity = HType . Result
55
96
56
97
57−instance (Sql DBType a, NotNull a, x ~ NonEmpty a) => ToExprs (Expr x) (NonEmpty a)
98+instance (Sql DBType a, NotNull a, x ~ NonEmpty a) => ToExprs (NonEmpty a) (Expr x)
99+ where
100+ fromIdentity (HType (Result a)) = a
101+ toIdentity = HType . Result
58
102
59
103
60−instance (ToExprs exprs1 a, ToExprs exprs2 b, x ~ (exprs1, exprs2)) =>
104+instance (ToExprs a exprs1, ToExprs b exprs2, x ~ EitherTable exprs1 exprs2) =>
61− ToExprs x (a, b)
105+ ToExprs (Either a b) x
106+ where
107+ fromIdentity =
108+ bimap
109+ (fromIdentity' @exprs1 . hunlabel unlabeler)
110+ (fromIdentity' @exprs2 . hunlabel unlabeler) .
111+ fromHEitherTable
112+ toIdentity =
113+ toHEitherTable .
114+ bimap
115+ (hlabel labeler . toIdentity' @exprs1)
116+ (hlabel labeler . toIdentity' @exprs2)
62
117
63
118
64−instance
119+instance ToExprs a exprs => ToExprs [a] (ListTable exprs) where
65− ( ToExprs exprs1 a
120+ fromIdentity = fmap (fromIdentity' @exprs) . fromHListTable
66− , ToExprs exprs2 b
121+ toIdentity = toHListTable . fmap (toIdentity' @exprs)
67− , ToExprs exprs3 c
68− , x ~ (exprs1, exprs2, exprs3)
69− )
70− => ToExprs x (a, b, c)
71
122
72
123
73−instance
124+instance ToExprs a exprs => ToExprs (Maybe a) (MaybeTable exprs) where
74− ( ToExprs exprs1 a
125+ fromIdentity =
75− , ToExprs exprs2 b
126+ fmap (fromIdentity' @exprs . hunlabel unlabeler) .
76− , ToExprs exprs3 c
127+ fromHMaybeTable
77− , ToExprs exprs4 d
128+ toIdentity =
78− , x ~ (exprs1, exprs2, exprs3, exprs4)
129+ toHMaybeTable .
79− )
130+ fmap (hlabel labeler . toIdentity' @exprs)
80− => ToExprs x (a, b, c, d)
131+
132+
133+instance ToExprs a exprs => ToExprs (NonEmpty a) (NonEmptyTable exprs)
134+ where
135+ fromIdentity = fmap (fromIdentity' @exprs) . fromHNonEmptyTable
136+ toIdentity = toHNonEmptyTable . fmap (toIdentity' @exprs)
137+
138+
139+instance (ToExprs a exprs1, ToExprs b exprs2, x ~ TheseTable exprs1 exprs2) =>
140+ ToExprs (These a b) x
141+ where
142+ fromIdentity =
143+ bimap
144+ (fromIdentity' @exprs1 . hunlabel unlabeler)
145+ (fromIdentity' @exprs2 . hunlabel unlabeler) .
146+ fromHTheseTable
147+ toIdentity =
148+ toHTheseTable .
149+ bimap
150+ (hlabel labeler . toIdentity' @exprs1)
151+ (hlabel labeler . toIdentity' @exprs2)
152+
153+
154+instance (ToExprs a exprs1, ToExprs b exprs2, x ~ (exprs1, exprs2)) =>
155+ ToExprs (a, b) x
156+ where
157+ fromIdentity (HPair a b) =
158+ ( fromIdentity' @exprs1 $ hunlabel unlabeler a
159+ , fromIdentity' @exprs2 $ hunlabel unlabeler b
160+ )
161+ toIdentity (a, b) = HPair
162+ { hfst = hlabel labeler $ toIdentity' @exprs1 a
163+ , hsnd = hlabel labeler $ toIdentity' @exprs2 b
164+ }
81
165
82
166
83instance
167instance
84− ( ToExprs exprs1 a
168+ ( ToExprs a exprs1
85− , ToExprs exprs2 b
169+ , ToExprs b exprs2
86− , ToExprs exprs3 c
170+ , ToExprs c exprs3
87− , ToExprs exprs4 d
171+ , x ~ (exprs1, exprs2, exprs3)
88− , ToExprs exprs5 e
172+ ) => ToExprs (a, b, c) x
89− , x ~ (exprs1, exprs2, exprs3, exprs4, exprs5)
173+ where
90− )
174+ fromIdentity (HTrio a b c) =
91− => ToExprs x (a, b, c, d, e)
175+ ( fromIdentity' @exprs1 $ hunlabel unlabeler a
176+ , fromIdentity' @exprs2 $ hunlabel unlabeler b
177+ , fromIdentity' @exprs3 $ hunlabel unlabeler c
178+ )
179+ toIdentity (a, b, c) = HTrio
180+ { hfst = hlabel labeler $ toIdentity' @exprs1 a
181+ , hsnd = hlabel labeler $ toIdentity' @exprs2 b
182+ , htrd = hlabel labeler $ toIdentity' @exprs3 c
183+ }
92
184
93
185
94instance
186instance
95− ( ToExprs exprs1 a
187+ ( ToExprs a exprs1
96− , ToExprs exprs2 b
188+ , ToExprs b exprs2
97− , ToExprs exprs3 c
189+ , ToExprs c exprs3
98− , ToExprs exprs4 d
190+ , ToExprs d exprs4
99− , ToExprs exprs5 e
191+ , x ~ (exprs1, exprs2, exprs3, exprs4)
100− , ToExprs exprs6 f
192+ ) => ToExprs (a, b, c, d) x
101− , x ~ (exprs1, exprs2, exprs3, exprs4, exprs5, exprs6)
193+ where
102− )
194+ fromIdentity (HQuartet a b c d) =
103− => ToExprs x (a, b, c, d, e, f)
195+ ( fromIdentity' @exprs1 $ hunlabel unlabeler a
196+ , fromIdentity' @exprs2 $ hunlabel unlabeler b
197+ , fromIdentity' @exprs3 $ hunlabel unlabeler c
198+ , fromIdentity' @exprs4 $ hunlabel unlabeler d
199+ )
200+ toIdentity (a, b, c, d) = HQuartet
201+ { hfst = hlabel labeler $ toIdentity' @exprs1 a
202+ , hsnd = hlabel labeler $ toIdentity' @exprs2 b
203+ , htrd = hlabel labeler $ toIdentity' @exprs3 c
204+ , hfrt = hlabel labeler $ toIdentity' @exprs4 d
205+ }
104
206
105
207
106instance
208instance
107− ( ToExprs exprs1 a
209+ ( ToExprs a exprs1
108− , ToExprs exprs2 b
210+ , ToExprs b exprs2
109− , ToExprs exprs3 c
211+ , ToExprs c exprs3
110− , ToExprs exprs4 d
212+ , ToExprs d exprs4
111− , ToExprs exprs5 e
213+ , ToExprs e exprs5
112− , ToExprs exprs6 f
214+ , x ~ (exprs1, exprs2, exprs3, exprs4, exprs5)
113− , ToExprs exprs7 g
215+ ) => ToExprs (a, b, c, d, e) x
114− , x ~ (exprs1, exprs2, exprs3, exprs4, exprs5, exprs6, exprs7)
216+ where
115− )
217+ fromIdentity (HQuintet a b c d e) =
116− => ToExprs x (a, b, c, d, e, f, g)
218+ ( fromIdentity' @exprs1 $ hunlabel unlabeler a
219+ , fromIdentity' @exprs2 $ hunlabel unlabeler b
220+ , fromIdentity' @exprs3 $ hunlabel unlabeler c
221+ , fromIdentity' @exprs4 $ hunlabel unlabeler d
222+ , fromIdentity' @exprs5 $ hunlabel unlabeler e
223+ )
224+ toIdentity (a, b, c, d, e) = HQuintet
225+ { hfst = hlabel labeler $ toIdentity' @exprs1 a
226+ , hsnd = hlabel labeler $ toIdentity' @exprs2 b
227+ , htrd = hlabel labeler $ toIdentity' @exprs3 c
228+ , hfrt = hlabel labeler $ toIdentity' @exprs4 d
229+ , hfft = hlabel labeler $ toIdentity' @exprs5 e
230+ }
231+
232+
233+instance (HTable t, result ~ Col Identity, x ~ t (Col Expr)) =>
234+ ToExprs (t result) x
235+ where
236+ fromIdentity = id
237+ toIdentity = id
238+
239+
240+instance (Recontextualize Identity Expr (t Identity) (t Expr), result ~ Identity, x ~ t Expr) =>
241+ ToExprs (t result) x
242+ where
243+ fromIdentity = fromColumns
244+ toIdentity = toColumns
245+
246+
247+instance (KnownSpec spec, x ~ Col Expr spec) =>
248+ ToExprs (Col Identity spec) x
249+ where
250+ fromIdentity = fromColumns
251+ toIdentity = toColumns
252+
253+
254+type FromExprs :: Type -> Type
255+type family FromExprs a where
256+ FromExprs (Expr a) = a
257+ FromExprs (Col Expr spec) = Col Identity spec
258+ FromExprs (EitherTable a b) = Either (FromExprs a) (FromExprs b)
259+ FromExprs (ListTable a) = [FromExprs a]
260+ FromExprs (MaybeTable a) = Maybe (FromExprs a)
261+ FromExprs (NonEmptyTable a) = NonEmpty (FromExprs a)
262+ FromExprs (TheseTable a b) = These (FromExprs a) (FromExprs b)
263+ FromExprs (a, b) = (FromExprs a, FromExprs b)
264+ FromExprs (a, b, c) = (FromExprs a, FromExprs b, FromExprs c)
265+ FromExprs (a, b, c, d) =
266+ (FromExprs a, FromExprs b, FromExprs c, FromExprs d)
267+ FromExprs (a, b, c, d, e) =
268+ (FromExprs a, FromExprs b, FromExprs c, FromExprs d, FromExprs e)
269+ FromExprs (t Expr) = t Identity
270+ FromExprs (t (Col Expr)) = t (Col Identity)
117
271
118
272
119-- | @Serializable@ witnesses the one-to-one correspondence between the type
273-- | @Serializable@ witnesses the one-to-one correspondence between the type
120-- @sql@, which contains SQL expressions, and the type @haskell@, which
274-- @sql@, which contains SQL expressions, and the type @haskell@, which
121-- contains the Haskell decoding of rows containing @sql@ SQL expressions.
275-- contains the Haskell decoding of rows containing @sql@ SQL expressions.
122type Serializable :: Type -> Type -> Constraint
276type Serializable :: Type -> Type -> Constraint
123−class (ToExprs exprs a, a ~ FromExprs exprs) => Serializable exprs a | exprs -> a
277+class (ToExprs a exprs, a ~ FromExprs exprs) => Serializable exprs a | exprs -> a
124−instance (ToExprs exprs a, a ~ FromExprs exprs) => Serializable exprs a
278+instance (ToExprs a exprs, a ~ FromExprs exprs) => Serializable exprs a
125instance {-# OVERLAPPING #-} Sql DBType a => Serializable (Expr a) a
279instance {-# OVERLAPPING #-} Sql DBType a => Serializable (Expr a) a
126
280
127
281
128−-- | Use @lit@ to turn literal Haskell values into expressions. @lit@ is
129−-- capable of lifting single @Expr@s to full tables.
130lit :: forall exprs a. Serializable exprs a => a -> exprs
282lit :: forall exprs a. Serializable exprs a => a -> exprs
131−lit = fromColumns . litHTable . toResult @_ @exprs
283+lit = fromColumns . litHTable . toIdentity' @exprs
132
284
133
285
134parse :: forall exprs a. Serializable exprs a => Hasql.Row a
286parse :: forall exprs a. Serializable exprs a => Hasql.Row a
135−parse = fromResult @_ @exprs <$> parseHTable
287+parse = fromIdentity' @exprs <$> parseHTable
288+
289+
290+type Encodes :: Type -> Type -> Constraint
291+class Serializable exprs a => Encodes a exprs | a -> exprs, exprs -> a
292+
293+
294+instance KnownSpec spec => Encodes (Col Identity spec) (Col Expr spec)
295+
296+
297+instance Serializable (t Identity) (t Expr) => Encodes (t Expr) (t Identity)
298+
299+
300+instance HTable t => Encodes (t (Col Identity)) (t (Col Expr))
301+
302+
303+instance (Encodes a x, Encodes b y) => Encodes (Either a b) (EitherTable x y)
304+
305+
306+instance Encodes a x => Encodes [a] (ListTable x)
307+
308+
309+instance Encodes a x => Encodes (Maybe a) (MaybeTable x)
310+
311+
312+instance Encodes a x => Encodes (NonEmpty a) (NonEmptyTable x)
313+
314+
315+instance (Encodes a x, Encodes b y) => Encodes (These a b) (TheseTable x y)
316+
317+
318+instance (Encodes a x, Encodes b y) => Encodes (a, b) (x, y)
319+
320+
321+instance (Encodes a x, Encodes b y, Encodes c z) =>
322+ Encodes (a, b, c) (x, y, z)
323+
324+
325+instance (Encodes a w, Encodes b x, Encodes c y, Encodes d z) =>
326+ Encodes (a, b, c, d) (w, x, y, z)
327+
328+
329+instance (Encodes a v, Encodes b w, Encodes c x, Encodes d y, Encodes e z) =>
330+ Encodes (a, b, c, d, e) (v, w, x, y, z)
331+
332+
333+litTable :: Encodes a exprs => a -> exprs
334+litTable = lit
136
335
137
336
138−litHTable :: HTable t => t Result -> t Expr
337+litHTable :: HTable t => t (Col Identity) -> t (Col Expr)
139litHTable as = htabulate $ \field ->
338litHTable as = htabulate $ \field ->
140 case hfield hspecs field of
339 case hfield hspecs field of
141− Spec {nullity, info} -> case hfield as field of
340+ SSpec {nullability, info} -> case hfield as field of
142− Identity value -> slitExpr nullity info value
341+ Result value -> DB (slitExpr nullability info value)
143
342
144
343
145−parseHTable :: HTable t => Hasql.Row (t Result)
344+parseHTable :: HTable t => Hasql.Row (t (Col Identity))
146parseHTable = unwrapApplicative $ htabulateA $ \field ->
345parseHTable = unwrapApplicative $ htabulateA $ \field ->
147 WrapApplicative $ case hfield hspecs field of
346 WrapApplicative $ case hfield hspecs field of
148− Spec {nullity, info} -> Identity <$> sparseValue nullity info
347+ SSpec {nullability, info} -> Result <$> sparseValue nullability info
src/Rel8/Table/Tag.hsnew file+104
@@ -0,0 +1,104 @@
1+{-# language DataKinds #-}
2+{-# language FlexibleInstances #-}
3+{-# language GADTs #-}
4+{-# language InstanceSigs #-}
5+{-# language NamedFieldPuns #-}
6+{-# language ScopedTypeVariables #-}
7+{-# language StandaloneKindSignatures #-}
8+{-# language TypeApplications #-}
9+{-# language UndecidableInstances #-}
10+
11+module Rel8.Table.Tag
12+ ( Tag(..), Taggable
13+ , fromAggregate
14+ , fromExpr
15+ , fromName
16+ )
17+where
18+
19+-- base
20+import Control.Applicative ( (<|>), empty )
21+import Data.Kind ( Constraint, Type )
22+import Data.Foldable ( fold )
23+import Data.Monoid ( getFirst )
24+import Data.Proxy ( Proxy( Proxy ) )
25+import GHC.TypeLits ( KnownSymbol, Symbol, symbolVal )
26+import Prelude
27+
28+-- rel8
29+import Rel8.Aggregate ( Aggregate, Aggregator, foldInputs )
30+import Rel8.Expr ( Expr )
31+import Rel8.Expr.Opaleye ( fromPrimExpr )
32+import Rel8.Schema.Dict ( Dict( Dict ) )
33+import Rel8.Schema.Name ( Name( Name ) )
34+import Rel8.Schema.Nullability ( Sql, mapSql )
35+import Rel8.Type.Monoid ( DBMonoid )
36+import Rel8.Type.Semigroup ( DBSemigroup )
37+
38+
39+type Tag :: Symbol -> Type -> Type
40+data Tag label a = Tag
41+ { expr :: Expr a
42+ , aggregator :: Maybe Aggregator
43+ , name :: Name a
44+ }
45+
46+
47+type Taggable :: Type -> Constraint
48+class Taggable a where
49+ tappend :: KnownSymbol label => Tag label a -> Tag label a -> Tag label a
50+ tempty :: KnownSymbol label => Tag label a
51+
52+
53+instance Sql DBMonoid a => Taggable a where
54+ tappend :: forall label. KnownSymbol label
55+ => Tag label a -> Tag label a -> Tag label a
56+ tappend a b = Tag
57+ { expr = case mapSql dbSemigroupFromDBMonoid (Dict @_ @a) of
58+ Dict -> expr a <> expr b
59+ , aggregator = aggregator a <|> aggregator b
60+ , name = case (name a, symbolVal (Proxy @label)) of
61+ (Name x, y)
62+ | x == y -> name b
63+ | otherwise -> name a
64+ }
65+ {-# INLINABLE tappend #-}
66+
67+ tempty :: forall label. KnownSymbol label => Tag label a
68+ tempty = Tag
69+ { expr = mempty
70+ , aggregator = empty
71+ , name = Name (symbolVal (Proxy @label))
72+ }
73+ {-# INLINABLE tempty #-}
74+
75+
76+instance (KnownSymbol label, Taggable a) => Semigroup (Tag label a) where
77+ (<>) = tappend
78+
79+
80+instance (KnownSymbol label, Taggable a) => Monoid (Tag label a) where
81+ mempty = tempty
82+
83+
84+fromAggregate :: forall a label. (KnownSymbol label, Taggable a)
85+ => Aggregate (Expr a) -> Tag label a
86+fromAggregate = fold . getFirst . foldInputs go
87+ where
88+ go aggregator primExpr = pure $ (tempty @a @label)
89+ { expr = fromPrimExpr primExpr
90+ , aggregator
91+ }
92+
93+
94+fromExpr :: forall label a. (KnownSymbol label, Taggable a)
95+ => Expr a -> Tag label a
96+fromExpr expr = (tempty @a @label) {expr}
97+
98+
99+fromName :: forall a label. Taggable a => Name a -> Tag label a
100+fromName name = (tempty @a @"") {name}
101+
102+
103+dbSemigroupFromDBMonoid :: Dict DBMonoid a -> Dict DBSemigroup a
104+dbSemigroupFromDBMonoid Dict = Dict
src/Rel8/Table/These.hs+133−211
@@ -5,6 +5,7 @@
5{-# language FlexibleInstances #-}
5{-# language FlexibleInstances #-}
6{-# language MultiParamTypeClasses #-}
6{-# language MultiParamTypeClasses #-}
7{-# language NamedFieldPuns #-}
7{-# language NamedFieldPuns #-}
8+{-# language RecordWildCards #-}
8{-# language ScopedTypeVariables #-}
9{-# language ScopedTypeVariables #-}
9{-# language StandaloneKindSignatures #-}
10{-# language StandaloneKindSignatures #-}
10{-# language TupleSections #-}
11{-# language TupleSections #-}
@@ -12,115 +13,87 @@
12{-# language TypeFamilies #-}
13{-# language TypeFamilies #-}
13{-# language UndecidableInstances #-}
14{-# language UndecidableInstances #-}
14
15
15−{-# options_ghc -fno-warn-orphans #-}
16−
17module Rel8.Table.These
16module Rel8.Table.These
18 ( TheseTable(..)
17 ( TheseTable(..)
19 , theseTable, thisTable, thatTable, thoseTable
18 , theseTable, thisTable, thatTable, thoseTable
20 , isThisTable, isThatTable, isThoseTable
19 , isThisTable, isThatTable, isThoseTable
21 , hasHereTable, hasThereTable
20 , hasHereTable, hasThereTable
22 , justHereTable, justThereTable
21 , justHereTable, justThereTable
23− , alignMaybeTable
22+ , aggregateTheseTable, nameTheseTable
24− , aggregateTheseTable
25− , nameTheseTable
26 )
23 )
27where
24where
28
25
29-- base
26-- base
30import Data.Bifunctor ( Bifunctor, bimap )
27import Data.Bifunctor ( Bifunctor, bimap )
28+import Data.Functor.Identity ( runIdentity )
31import Data.Kind ( Type )
29import Data.Kind ( Type )
32−import Data.Maybe ( isJust )
30+import Prelude hiding ( undefined )
33−import Prelude hiding ( null, undefined )
34
31
35-- rel8
32-- rel8
36import Rel8.Aggregate ( Aggregate )
33import Rel8.Aggregate ( Aggregate )
37import Rel8.Expr ( Expr )
34import Rel8.Expr ( Expr )
38−import Rel8.Expr.Bool ( (&&.), (||.), boolExpr, not_ )
35+import Rel8.Expr.Bool ( (&&.), not_ )
39−import Rel8.Expr.Null ( null, isNonNull )
36+import Rel8.Expr.Null ( isNonNull )
40−import Rel8.Kind.Context ( Reifiable )
37+import Rel8.Schema.Context.Label ( Labelable, labeler, unlabeler, hlabeler )
41−import Rel8.Schema.Context.Nullify ( Nullifiable )
38+import Rel8.Schema.Context.Nullify
42−import Rel8.Schema.Dict ( Dict( Dict ) )
39+ ( Nullifiable, ConstrainTag
43−import Rel8.Schema.HTable.Label ( hlabel, hrelabel, hunlabel )
40+ , hencodeTag, hdecodeTag
41+ , hnullifier, hunnullifier
42+ )
43+import Rel8.Schema.HTable.Label ( HLabel, hlabel, hunlabel )
44import Rel8.Schema.HTable.Identity ( HIdentity(..) )
44import Rel8.Schema.HTable.Identity ( HIdentity(..) )
45−import Rel8.Schema.HTable.Maybe ( HMaybeTable(..) )
45+import Rel8.Schema.HTable.Maybe ( HMaybeNullifiable )
46+import Rel8.Schema.HTable.Nullify ( hnullify, hunnullify )
46import Rel8.Schema.HTable.These ( HTheseTable(..) )
47import Rel8.Schema.HTable.These ( HTheseTable(..) )
47−import qualified Rel8.Schema.Kind as K
48+import Rel8.Schema.Name ( Name )
48−import Rel8.Schema.Name ( Name )
49+import Rel8.Table ( Table, Columns, Context, fromColumns, toColumns )
49−import Rel8.Table
50− ( Table, Columns, Context, fromColumns, toColumns
51− , FromExprs, fromResult, toResult
52− , Transpose
53− )
54import Rel8.Table.Eq ( EqTable, eqTable )
50import Rel8.Table.Eq ( EqTable, eqTable )
51+import Rel8.Table.Lifted
52+ ( Table2, Columns2, ConstrainHContext2, fromColumns2, toColumns2
53+ )
55import Rel8.Table.Maybe
54import Rel8.Table.Maybe
56 ( MaybeTable(..)
55 ( MaybeTable(..)
57 , maybeTable, justTable, nothingTable
56 , maybeTable, justTable, nothingTable
58 , isJustTable
57 , isJustTable
59− , aggregateMaybeTable
58+ , aggregateMaybeTable, nameMaybeTable
60− , nameMaybeTable
61 )
59 )
62−import Rel8.Table.Nullify ( Nullify, guard )
63import Rel8.Table.Ord ( OrdTable, ordTable )
60import Rel8.Table.Ord ( OrdTable, ordTable )
64−import Rel8.Table.Projection ( Biprojectable, Projectable, biproject, project )
61+import Rel8.Table.Recontextualize ( Recontextualize )
65−import Rel8.Table.Serialize ( ToExprs )
62+import Rel8.Table.Tag ( Tag(..) )
66import Rel8.Table.Undefined ( undefined )
63import Rel8.Table.Undefined ( undefined )
67import Rel8.Type.Tag ( MaybeTag )
64import Rel8.Type.Tag ( MaybeTag )
68
65
69-- semigroupoids
66-- semigroupoids
70−import Data.Functor.Apply ( Apply, (<.>) )
67+import Data.Functor.Apply ( Apply, (<.>), liftF2 )
71import Data.Functor.Bind ( Bind, (>>-) )
68import Data.Functor.Bind ( Bind, (>>-) )
72
69
73−-- these
70+
74−import Data.These ( These( This, That, These ) )
71+type TheseTable :: Type -> Type -> Type
75−import Data.These.Combinators ( justHere, justThere )
72+data TheseTable a b = TheseTable
76−
73+ { here :: MaybeTable a
77−
74+ , there :: MaybeTable b
78−-- | @TheseTable a b@ is a Rel8 table that contains either the table @a@, the
79−-- table @b@, or both tables @a@ and @b@. You can construct @TheseTable@s using
80−-- 'thisTable', 'thatTable' and 'thoseTable'. @TheseTable@s can be
81−-- eliminated/pattern matched using 'theseTable'.
82−--
83−-- @TheseTable@ is operationally the same as Haskell's 'These' type, but
84−-- adapted to work with Rel8.
85−type TheseTable :: K.Context -> Type -> Type -> Type
86−data TheseTable context a b = TheseTable
87− { here :: MaybeTable context a
88− , there :: MaybeTable context b
89 }
75 }
90 deriving stock Functor
76 deriving stock Functor
91
77
92
78
93−instance Biprojectable (TheseTable context) where
79+instance Bifunctor TheseTable where
94− biproject f g (TheseTable a b) = TheseTable (project f a) (project g b)
95−
96−
97−instance Nullifiable context => Bifunctor (TheseTable context) where
98 bimap f g (TheseTable a b) = TheseTable (fmap f a) (fmap g b)
80 bimap f g (TheseTable a b) = TheseTable (fmap f a) (fmap g b)
99
81
100
82
101−instance Projectable (TheseTable context a) where
83+instance (Table Expr a, Semigroup a) => Apply (TheseTable a) where
102− project f (TheseTable a b) = TheseTable a (project f b)
103−
104−
105−instance (context ~ Expr, Table Expr a, Semigroup a) =>
106− Apply (TheseTable context a)
107− where
108 fs <.> as = TheseTable
84 fs <.> as = TheseTable
109 { here = here fs <> here as
85 { here = here fs <> here as
110 , there = there fs <.> there as
86 , there = there fs <.> there as
111 }
87 }
112
88
113
89
114−instance (context ~ Expr, Table Expr a, Semigroup a) =>
90+instance (Table Expr a, Semigroup a) => Applicative (TheseTable a)
115− Applicative (TheseTable context a)
116 where
91 where
117 pure = thatTable
92 pure = thatTable
118 (<*>) = (<.>)
93 (<*>) = (<.>)
119
94
120
95
121−instance (context ~ Expr, Table Expr a, Semigroup a) =>
96+instance (Table Expr a, Semigroup a) => Bind (TheseTable a) where
122− Bind (TheseTable context a)
123− where
124 TheseTable here1 ma >>- f = case ma >>- f' of
97 TheseTable here1 ma >>- f = case ma >>- f' of
125 mtb -> TheseTable
98 mtb -> TheseTable
126 { here = maybeTable here1 ((here1 <>) . fst) mtb
99 { here = maybeTable here1 ((here1 <>) . fst) mtb
@@ -131,14 +104,12 @@ instance (context ~ Expr, Table Expr a, Semigroup a) =>
131 TheseTable here2 mb -> (here2,) <$> mb
104 TheseTable here2 mb -> (here2,) <$> mb
132
105
133
106
134−instance (context ~ Expr, Table Expr a, Semigroup a) =>
107+instance (Table Expr a, Semigroup a) => Monad (TheseTable a) where
135− Monad (TheseTable context a)
136− where
137 (>>=) = (>>-)
108 (>>=) = (>>-)
138
109
139
110
140−instance (context ~ Expr, Table Expr a, Table Expr b, Semigroup a, Semigroup b) =>
111+instance (Table Expr a, Table Expr b, Semigroup a, Semigroup b) =>
141− Semigroup (TheseTable context a b)
112+ Semigroup (TheseTable a b)
142 where
113 where
143 a <> b = TheseTable
114 a <> b = TheseTable
144 { here = here a <> here b
115 { here = here a <> here b
@@ -146,177 +117,139 @@ instance (context ~ Expr, Table Expr a, Table Expr b, Semigroup a, Semigroup b)
146 }
117 }
147
118
148
119
149−instance
120+instance Table2 TheseTable where
150− ( Table context a, Table context b
121+ type Columns2 TheseTable = HTheseTable
151− , Reifiable context, context ~ context'
122+ type ConstrainHContext2 TheseTable = HMaybeNullifiable
152− )
123+
153− => Table context' (TheseTable context a b)
124+ toColumns2 f g TheseTable {here, there} = HTheseTable
154− where
125+ { hhereTag = HIdentity $ hencodeTag (toHereTag (tag here))
155− type Columns (TheseTable context a b) = HTheseTable (Columns a) (Columns b)
156− type Context (TheseTable context a b) = Context a
157− type FromExprs (TheseTable context a b) =
158− These (FromExprs a) (FromExprs b)
159− type Transpose to (TheseTable context a b) =
160− TheseTable to (Transpose to a) (Transpose to b)
161−
162− toColumns TheseTable {here, there} = HTheseTable
163− { hhereTag = hlabel $ HIdentity $ tag here
164 , hhere =
126 , hhere =
165− hlabel $ guard (tag here) isJust isNonNull $ toColumns $ just here
127+ hnullify (hnullifier (tag here) isNonNull) $ f (just here)
166− , hthereTag = hlabel $ HIdentity $ tag there
128+ , hthereTag = HIdentity $ hencodeTag (toThereTag (tag there))
167 , hthere =
129 , hthere =
168− hlabel $ guard (tag there) isJust isNonNull $ toColumns $ just there
130+ hnullify (hnullifier (tag there) isNonNull) $ g (just there)
169 }
131 }
170
132
171− fromColumns HTheseTable {hhereTag, hhere, hthereTag, hthere} = TheseTable
133+ fromColumns2 f g HTheseTable {hhereTag, hhere, hthereTag, hthere} =
172− { here = MaybeTable
134+ TheseTable
173− { tag = unHIdentity $ hunlabel hhereTag
135+ { here =
174− , just = fromColumns $ hunlabel hhere
136+ let
175− }
137+ tag = hdecodeTag $ unHIdentity hhereTag
176− , there = MaybeTable
138+ in
177− { tag = unHIdentity $ hunlabel hthereTag
139+ MaybeTable
178− , just = fromColumns $ hunlabel hthere
140+ { tag
179− }
141+ , just = f $
180− }
142+ runIdentity $
143+ hunnullify (\a -> pure . hunnullifier a)
144+ hhere
145+ }
146+ , there =
147+ let
148+ tag = hdecodeTag $ unHIdentity hthereTag
149+ in
150+ MaybeTable
151+ { tag
152+ , just = g $
153+ runIdentity $
154+ hunnullify (\a -> pure . hunnullifier a)
155+ hthere
156+ }
157+ }
181
158
182− toResult tables = HTheseTable
159+ {-# INLINABLE fromColumns2 #-}
183− { hhereTag = hrelabel hhereTag
160+ {-# INLINABLE toColumns2 #-}
184− , hhere = hrelabel hhere
185− , hthereTag = hrelabel hthereTag
186− , hthere = hrelabel hthere
187− }
188− where
189− HMaybeTable
190− { htag = hhereTag
191− , hjust = hhere
192− } = toResult @_ @(MaybeTable context a) (justHere tables)
193− HMaybeTable
194− { htag = hthereTag
195− , hjust = hthere
196− } = toResult @_ @(MaybeTable context b) (justThere tables)
197−
198− fromResult HTheseTable {hhereTag, hhere, hthereTag, hthere} =
199− case (here, there) of
200− (Just a, Nothing) -> This a
201− (Nothing, Just b) -> That b
202− (Just a, Just b) -> These a b
203− _ -> error "These.fromColumns: mismatch between tags and data"
204− where
205− here = fromResult @_ @(MaybeTable context a) mhere
206− there = fromResult @_ @(MaybeTable context b) mthere
207− mhere = HMaybeTable
208− { htag = hrelabel hhereTag
209− , hjust = hrelabel hhere
210− }
211− mthere = HMaybeTable
212− { htag = hrelabel hthereTag
213− , hjust = hrelabel hthere
214− }
215−
216−
217−instance (EqTable a, EqTable b, context ~ Expr) =>
218− EqTable (TheseTable context a b)
219− where
220− eqTable = HTheseTable
221− { hhereTag = hlabel (HIdentity Dict)
222− , hhere = hlabel (eqTable @(Nullify context a))
223− , hthereTag = hlabel (HIdentity Dict)
224− , hthere = hlabel (eqTable @(Nullify context b))
225− }
226
161
227
162
228−instance (OrdTable a, OrdTable b, context ~ Expr) =>
163+instance
229− OrdTable (TheseTable context a b)
164+ ( Table context a, Table context b
165+ , Labelable context, Nullifiable context, ConstrainTag context MaybeTag
166+ ) => Table context (TheseTable a b)
230 where
167 where
231− ordTable = HTheseTable
168+ type Columns (TheseTable a b) =
232− { hhereTag = hlabel (HIdentity Dict)
169+ HTheseTable (HLabel "Here" (Columns a)) (HLabel "There" (Columns b))
233− , hhere = hlabel (ordTable @(Nullify context a))
170+ type Context (TheseTable a b) = Context a
234− , hthereTag = hlabel (HIdentity Dict)
171+
235− , hthere = hlabel (ordTable @(Nullify context b))
172+ toColumns =
236− }
173+ toColumns2
174+ (hlabel labeler . toColumns)
175+ (hlabel labeler . toColumns)
176+ fromColumns =
177+ fromColumns2
178+ (fromColumns . hunlabel unlabeler)
179+ (fromColumns . hunlabel unlabeler)
180+
181+
182+instance
183+ ( Labelable from, Nullifiable from, ConstrainTag from MaybeTag
184+ , Labelable to, Nullifiable to, ConstrainTag to MaybeTag
185+ , Recontextualize from to a1 b1
186+ , Recontextualize from to a2 b2
187+ ) =>
188+ Recontextualize from to (TheseTable a1 a2) (TheseTable b1 b2)
189+
190+
191+instance (EqTable a, EqTable b) => EqTable (TheseTable a b) where
192+ eqTable =
193+ toColumns2 (hlabel hlabeler) (hlabel hlabeler)
194+ (thoseTable (eqTable @a) (eqTable @b))
195+
196+
197+instance (OrdTable a, OrdTable b) => OrdTable (TheseTable a b) where
198+ ordTable =
199+ toColumns2 (hlabel hlabeler) (hlabel hlabeler)
200+ (thoseTable (ordTable @a) (ordTable @b))
237
201
238
202
239−instance (ToExprs exprs1 a, ToExprs exprs2 b, x ~ TheseTable Expr exprs1 exprs2) =>
203+toHereTag :: Tag "isJust" a -> Tag "hasHere" a
240− ToExprs x (These a b)
204+toHereTag Tag {..} = Tag {..}
241
205
242
206
243−-- | Test if a 'TheseTable' was constructed with 'thisTable'.
207+toThereTag :: Tag "isJust" a -> Tag "hasThere" a
244−--
208+toThereTag Tag {..} = Tag {..}
245−-- Corresponds to 'Data.These.Combinators.isThis'.
209+
246−isThisTable :: TheseTable Expr a b -> Expr Bool
210+
211+isThisTable :: TheseTable a b -> Expr Bool
247isThisTable a = hasHereTable a &&. not_ (hasThereTable a)
212isThisTable a = hasHereTable a &&. not_ (hasThereTable a)
248
213
249
214
250−-- | Test if a 'TheseTable' was constructed with 'thatTable'.
215+isThatTable :: TheseTable a b -> Expr Bool
251−--
252−-- Corresponds to 'Data.These.Combinators.isThat'.
253−isThatTable :: TheseTable Expr a b -> Expr Bool
254isThatTable a = not_ (hasHereTable a) &&. hasThereTable a
216isThatTable a = not_ (hasHereTable a) &&. hasThereTable a
255
217
256
218
257−-- | Test if a 'TheseTable' was constructed with 'thoseTable'.
219+isThoseTable :: TheseTable a b -> Expr Bool
258−--
259−-- Corresponds to 'Data.These.Combinators.isThese'.
260−isThoseTable :: TheseTable Expr a b -> Expr Bool
261isThoseTable a = hasHereTable a &&. hasThereTable a
220isThoseTable a = hasHereTable a &&. hasThereTable a
262
221
263
222
264−-- | Test if the @a@ side of @TheseTable a b@ is present.
223+hasHereTable :: TheseTable a b -> Expr Bool
265−--
266−-- Corresponds to 'Data.These.Combinators.hasHere'.
267−hasHereTable :: TheseTable Expr a b -> Expr Bool
268hasHereTable TheseTable {here} = isJustTable here
224hasHereTable TheseTable {here} = isJustTable here
269
225
270
226
271−-- | Test if the @b@ table of @TheseTable a b@ is present.
227+hasThereTable :: TheseTable a b -> Expr Bool
272−--
273−-- Corresponds to 'Data.These.Combinators.hasThere'.
274−hasThereTable :: TheseTable Expr a b -> Expr Bool
275hasThereTable TheseTable {there} = isJustTable there
228hasThereTable TheseTable {there} = isJustTable there
276
229
277
230
278−-- | Attempt to project out the @a@ table of a @TheseTable a b@.
231+justHereTable :: TheseTable a b -> MaybeTable a
279−--
280−-- Corresponds to 'Data.These.Combinators.justHere'.
281−justHereTable :: TheseTable context a b -> MaybeTable context a
282justHereTable = here
232justHereTable = here
283
233
284
234
285−-- | Attempt to project out the @b@ table of a @TheseTable a b@.
235+justThereTable :: TheseTable a b -> MaybeTable b
286−--
287−-- Corresponds to 'Data.These.Combinators.justThere'.
288−justThereTable :: TheseTable context a b -> MaybeTable context b
289justThereTable = there
236justThereTable = there
290
237
291
238
292−-- | Construct a @TheseTable@ from two 'MaybeTable's.
239+thisTable :: Table Expr b => a -> TheseTable a b
293−alignMaybeTable :: ()
294− => MaybeTable Expr a
295− -> MaybeTable Expr b
296− -> MaybeTable Expr (TheseTable Expr a b)
297−alignMaybeTable a b = MaybeTable tag (pure (TheseTable a b))
298− where
299− tag = boolExpr null mempty (isJustTable a ||. isJustTable b)
300−
301−
302−-- | Construct a @TheseTable@. Corresponds to 'This'.
303−thisTable :: Table Expr b => a -> TheseTable Expr a b
304thisTable a = TheseTable (justTable a) nothingTable
240thisTable a = TheseTable (justTable a) nothingTable
305
241
306
242
307−-- | Construct a @TheseTable@. Corresponds to 'That'.
243+thatTable :: Table Expr a => b -> TheseTable a b
308−thatTable :: Table Expr a => b -> TheseTable Expr a b
309thatTable b = TheseTable nothingTable (justTable b)
244thatTable b = TheseTable nothingTable (justTable b)
310
245
311
246
312−-- | Construct a @TheseTable@. Corresponds to 'These'.
247+thoseTable :: a -> b -> TheseTable a b
313−thoseTable :: a -> b -> TheseTable Expr a b
314thoseTable a b = TheseTable (justTable a) (justTable b)
248thoseTable a b = TheseTable (justTable a) (justTable b)
315
249
316
250
317−-- | Pattern match on a 'TheseTable'. Corresponds to 'these'.
318theseTable :: Table Expr c
251theseTable :: Table Expr c
319− => (a -> c) -> (b -> c) -> (a -> b -> c) -> TheseTable Expr a b -> c
252+ => (a -> c) -> (b -> c) -> (a -> b -> c) -> TheseTable a b -> c
320theseTable f g h TheseTable {here, there} =
253theseTable f g h TheseTable {here, there} =
321 maybeTable
254 maybeTable
322 (maybeTable undefined f here)
255 (maybeTable undefined f here)
@@ -324,32 +257,21 @@ theseTable f g h TheseTable {here, there} =
324 there
257 there
325
258
326
259
327−-- | Lift a pair of aggregating functions to operate on an 'TheseTable'.
328−-- @thisTable@s, @thatTable@s and @thoseTable@s are grouped separately.
329aggregateTheseTable :: ()
260aggregateTheseTable :: ()
330− => (exprs -> aggregates)
261+ => (a -> Aggregate c)
331− -> (exprs' -> aggregates')
262+ -> (b -> Aggregate d)
332− -> TheseTable Expr exprs exprs'
263+ -> TheseTable a b
333− -> TheseTable Aggregate aggregates aggregates'
264+ -> Aggregate (TheseTable c d)
334−aggregateTheseTable f g (TheseTable here there) = TheseTable
265+aggregateTheseTable f g TheseTable {here, there} =
335− { here = aggregateMaybeTable f here
266+ liftF2 TheseTable (aggregateMaybeTable f here) (aggregateMaybeTable g there)
336− , there = aggregateMaybeTable g there
337− }
338
267
339
268
340−-- | Construct a 'TheseTable' in the 'Name' context. This can be useful if you
341−-- have a 'TheseTable' that you are storing in a table and need to construct a
342−-- 'TableSchema'.
343nameTheseTable :: ()
269nameTheseTable :: ()
344 => Name (Maybe MaybeTag)
270 => Name (Maybe MaybeTag)
345− -- ^ The name of the column to track the presence of the @a@ table.
346 -> Name (Maybe MaybeTag)
271 -> Name (Maybe MaybeTag)
347− -- ^ The name of the column to track the presence of the @b@ table.
348 -> a
272 -> a
349− -- ^ Names of the columns in the @a@ table.
350 -> b
273 -> b
351− -- ^ Names of the columns in the @b@ table.
274+ -> TheseTable a b
352− -> TheseTable Name a b
353nameTheseTable here there a b =
275nameTheseTable here there a b =
354 TheseTable
276 TheseTable
355 { here = nameMaybeTable here a
277 { here = nameMaybeTable here a
src/Rel8/Table/Transpose.hsdeleted−46
@@ -1,46 +0,0 @@
1−{-# language DataKinds #-}
2−{-# language FlexibleInstances #-}
3−{-# language FunctionalDependencies #-}
4−{-# language StandaloneKindSignatures #-}
5−{-# language TypeFamilies #-}
6−{-# language UndecidableInstances #-}
7−
8−module Rel8.Table.Transpose
9− ( Transposes
10− )
11−where
12−
13−-- base
14−import Data.Kind ( Constraint, Type )
15−import Prelude ()
16−
17−-- rel8
18−import qualified Rel8.Schema.Kind as K
19−import Rel8.Table ( Table, Transpose, Congruent )
20−
21−
22−-- | @'Transposes' from to a b@ means that @a@ and @b@ are 'Table's, in the
23−-- @from@ and @to@ contexts respectively, which share the same underlying
24−-- structure. In other words, @b@ is a version of @a@ transposed from the
25−-- @from@ context to the @to@ context (and vice versa).
26−type Transposes :: K.Context -> K.Context -> Type -> Type -> Constraint
27−class
28− ( Table from a
29− , Table to b
30− , Congruent a b
31− , b ~ Transpose to a
32− , a ~ Transpose from b
33− )
34− => Transposes from to a b
35− | a -> from
36− , b -> to
37− , a to -> b
38− , b from -> a
39−instance
40− ( Table from a
41− , Table to b
42− , Congruent a b
43− , b ~ Transpose to a
44− , a ~ Transpose from b
45− )
46− => Transposes from to a b
src/Rel8/Table/Undefined.hs+6−6
@@ -11,16 +11,16 @@ where
11import Prelude hiding ( undefined )
11import Prelude hiding ( undefined )
12
12
13-- rel8
13-- rel8
14−import Rel8.Expr ( Expr )
14+import Rel8.Expr ( Expr, Col(..) )
15import Rel8.Expr.Null ( snull, unsafeUnnullify )
15import Rel8.Expr.Null ( snull, unsafeUnnullify )
16import Rel8.Schema.HTable ( htabulate, hfield, hspecs )
16import Rel8.Schema.HTable ( htabulate, hfield, hspecs )
17−import Rel8.Schema.Null ( Nullity( Null, NotNull ) )
17+import Rel8.Schema.Nullability ( Nullability( Nullable, NonNullable ) )
18−import Rel8.Schema.Spec ( Spec(..) )
18+import Rel8.Schema.Spec ( SSpec(..) )
19import Rel8.Table ( Table, fromColumns )
19import Rel8.Table ( Table, fromColumns )
20
20
21
21
22undefined :: Table Expr a => a
22undefined :: Table Expr a => a
23undefined = fromColumns $ htabulate $ \field -> case hfield hspecs field of
23undefined = fromColumns $ htabulate $ \field -> case hfield hspecs field of
24− Spec {nullity, info} -> case nullity of
24+ SSpec {nullability, info} -> case nullability of
25− Null -> snull info
25+ Nullable -> DB (snull info)
26− NotNull -> unsafeUnnullify (snull info)
26+ NonNullable -> DB (unsafeUnnullify (snull info))
src/Rel8/Table/Window.hsdeleted−43
@@ -1,43 +0,0 @@
1−{-# language MonoLocalBinds #-}
2−
3−module Rel8.Table.Window
4− ( cumulative
5− , cumulative_
6− , currentRow
7− )
8−where
9−
10−-- base
11−import Prelude
12−
13−-- opaleye
14−import qualified Opaleye.Window as Opaleye
15−
16−-- rel8
17−import Rel8.Aggregate ( Aggregates )
18−import qualified Rel8.Expr.Window as Expr
19−import Rel8.Schema.HTable ( hfield, htabulateA )
20−import Rel8.Table ( fromColumns, toColumns )
21−import Rel8.Window ( Window( Window ) )
22−
23−
24−-- | 'cumulative' allows the use of aggregation functions in 'Window'
25−-- expressions. In particular, @'cumulative' 'Rel8.sum'@
26−-- (when combined with 'Rel8.Window.orderPartitionBy') gives a running total,
27−-- also known as a \"cumulative sum\", hence the name @cumulative@.
28−cumulative :: Aggregates aggregates exprs => (a -> aggregates) -> Window a exprs
29−cumulative f =
30− fmap fromColumns $
31− htabulateA $ \field ->
32− Expr.cumulative ((`hfield` field) . toColumns . f)
33−
34−
35−-- | A version of 'cumulative' for use with nullary aggregators like
36−-- 'Rel8.Expr.Aggregate.countStar'.
37−cumulative_ :: Aggregates aggregates exprs => aggregates -> Window a exprs
38−cumulative_ = cumulative . const
39−
40−
41−-- | Return every column of the current row of a window query.
42−currentRow :: Window a a
43−currentRow = Window $ Opaleye.over (Opaleye.noWindowFunction id) mempty mempty
src/Rel8/Tabulate.hs+140−549
@@ -1,640 +1,231 @@
1+{-# language DeriveFunctor #-}
2+{-# language DerivingStrategies #-}
1{-# language FlexibleContexts #-}
3{-# language FlexibleContexts #-}
2−{-# language MonoLocalBinds #-}
3−{-# language ScopedTypeVariables #-}
4−{-# language StandaloneKindSignatures #-}
5−{-# language TypeApplications #-}
6{-# language TupleSections #-}
4{-# language TupleSections #-}
7−{-# language UndecidableInstances #-}
8−
9−-- | "Rel8.Tabulate" provides an alternative API ('Tabulation') for writing
10−-- queries that complements the main "Rel8" API ('Query').
11
5
12module Rel8.Tabulate
6module Rel8.Tabulate
13− (
7+ ( Tabulation
14− Tabulation
8+ , runTabulation
15−
9+ , tabulate
16− -- * Interfacing with 'Query's
10+ , tabulateA
17 , fromQuery
11 , fromQuery
18− , toQuery
19 , liftQuery
12 , liftQuery
20− , through
13+ , prebind
14+ , postbind
15+ , indexed
16+ , ifilter
21 , lookup
17 , lookup
22−
23− -- * Aggregation and Ordering
24− , aggregate
25− , distinct
26− , order
27−
28− -- ** Magic 'Tabulation's
29− -- $magic
30− , count
31− , optional
32− , many
33− , some
34− , exists
35− , present
36− , absent
37−
38− -- * Natural joins
39 , align
18 , align
40 , alignWith
19 , alignWith
41 , leftAlign
20 , leftAlign
42 , leftAlignWith
21 , leftAlignWith
43− , rightAlign
44− , rightAlignWith
45 , zip
22 , zip
46 , zipWith
23 , zipWith
47 , similarity
24 , similarity
48 , difference
25 , difference
26+ , aggregateTabulation
27+ , optionalTabulation
49 )
28 )
50where
29where
51
30
52-- base
31-- base
53−import Control.Applicative ( (<|>), empty, liftA2 )
32+import Control.Applicative ( liftA2 )
54−import Control.Monad ( liftM2 )
33+import Control.Monad ( join, liftM2 )
55−import Data.Bifunctor ( Bifunctor, bimap, first, second )
34+import Data.Bifunctor ( bimap, first )
56import Data.Foldable ( traverse_ )
35import Data.Foldable ( traverse_ )
57−import Data.Function ( on )
36+import Data.Maybe ( fromMaybe )
58−import Data.Functor.Contravariant ( Contravariant, (>$<), contramap )
37+import Prelude hiding ( filter, lookup, undefined, zip, zipWith )
59−import Data.Int ( Int64 )
60−import Data.Kind ( Type )
61−import Data.Maybe ( fromJust, fromMaybe )
62−import Prelude hiding ( lookup, zip, zipWith )
63−
64−-- bifunctors
65−import Data.Bifunctor.Clown ( Clown( Clown ), runClown )
66−
67−-- comonad
68−import Control.Comonad ( extract )
69−
70−-- opaleye
71−import qualified Opaleye.Aggregate as Opaleye
72−import qualified Opaleye.Order as Opaleye ( orderBy, distinctOnExplicit )
73−
74−-- profunctors
75−import Data.Profunctor ( dimap, lmap )
76−
77−-- product-profunctors
78−import Data.Profunctor.Product
79− ( ProductProfunctor, (***!)
80− , SumProfunctor, (+++!)
81− )
82−import qualified Data.Profunctor.Product as PP
83
38
84-- rel8
39-- rel8
85−import Rel8.Aggregate ( Aggregates )
40+import Rel8.Aggregate ( Aggregate )
86import Rel8.Expr ( Expr )
41import Rel8.Expr ( Expr )
87−import Rel8.Expr.Aggregate ( countStar )
42+import Rel8.Expr.Bool ( not_, true )
88−import Rel8.Expr.Bool ( true )
89−import Rel8.Order ( Order( Order ) )
90import Rel8.Query ( Query )
43import Rel8.Query ( Query )
91−import qualified Rel8.Query.Exists as Q ( exists, present, absent )
44+import Rel8.Query.Aggregate ( aggregate )
92−import Rel8.Query.Filter ( where_ )
45+import Rel8.Query.Exists ( withBy, withoutBy )
93−import Rel8.Query.List ( catNonEmptyTable )
46+import Rel8.Query.Filter ( filter, where_ )
94−import qualified Rel8.Query.Maybe as Q ( optional )
47+import Rel8.Query.Maybe ( optional )
95−import Rel8.Query.Opaleye ( mapOpaleye, unsafePeekQuery )
96−import Rel8.Query.Rebind ( rebind )
97import Rel8.Query.These ( alignBy )
48import Rel8.Query.These ( alignBy )
98−import Rel8.Table ( Table, fromColumns, toColumns )
49+import Rel8.Table ( Table )
99−import Rel8.Table.Aggregate ( hgroupBy, listAgg, nonEmptyAgg )
50+import Rel8.Table.Aggregate ( groupBy )
100−import Rel8.Table.Alternative
51+import Rel8.Table.Eq ( EqTable, (==:) )
101− ( AltTable, (<|>:)
52+import Rel8.Table.Maybe ( MaybeTable )
102− , AlternativeTable, emptyTable
53+import Rel8.Table.These ( TheseTable, theseTable )
103− )
54+import Rel8.Table.Undefined ( undefined )
104−import Rel8.Table.Cols ( fromCols, toCols )
105−import Rel8.Table.Eq ( EqTable, (==:), eqTable )
106−import Rel8.Table.List ( ListTable( ListTable ) )
107−import Rel8.Table.Maybe ( MaybeTable( MaybeTable ), maybeTable )
108−import Rel8.Table.NonEmpty ( NonEmptyTable( NonEmptyTable ) )
109−import Rel8.Table.Opaleye ( aggregator, unpackspec )
110−import Rel8.Table.Ord ( OrdTable )
111−import Rel8.Table.Order ( ascTable )
112−import Rel8.Table.Projection
113− ( Biprojectable, biproject
114− , Projectable, project
115− , apply
116− )
117−import Rel8.Table.These ( TheseTable( TheseTable ), theseTable )
118
55
119-- semigroupoids
56-- semigroupoids
120import Data.Functor.Apply ( Apply, liftF2 )
57import Data.Functor.Apply ( Apply, liftF2 )
121−import Data.Functor.Bind ( Bind, (>>-) )
58+import Data.Functor.Bind ( Bind )
122−
59+import qualified Data.Functor.Bind
123−
60+import Data.Semigroup.Traversable.Class ( bitraverse1 )
124−type Key :: Type -> Type
125−type Key = Maybe
126−
127−
128−cat :: Table Expr k => Key k -> Query k
129−cat = maybe emptyTable pure
130−
131−
132−key :: (ProductProfunctor p, SumProfunctor p)
133− => p a b -> p (Key a) (Key b)
134−key a = dimap from to (PP.empty +++! a)
135− where
136− from = maybe (Left ()) Right
137− to = either (const Nothing) Just
138−
139−
140−keyed :: (ProductProfunctor p, SumProfunctor p)
141− => p k l -> p a b -> p (Key k, a) (Key l, b)
142−keyed k a = key k ***! a
143−
144−
145−type Predicate :: Type -> Type
146−newtype Predicate a = Predicate (Maybe (a -> Expr Bool))
147−
148−
149−instance Contravariant Predicate where
150− contramap f (Predicate a) = Predicate (lmap f <$> a)
151−
152−
153−instance Semigroup (Predicate k) where
154− Predicate ma <> Predicate mb = Predicate $ ma <|> mb
155−
156−
157−instance Monoid (Predicate k) where
158− mempty = Predicate Nothing
159−
160−
161−match :: EqTable k => Key k -> Predicate k
162−match = Predicate . fmap (==:)
163−
164−
165−ensure :: Predicate k -> Key k -> Query ()
166−ensure (Predicate mp) = traverse_ (\k -> traverse_ (\p -> where_ (p k)) mp)
167−
168−
169−-- | A @'Tabulation' k a@ is like a @'Query' a@, except that each row also
170−-- has a key @k@ in addition to the value @a@. 'Tabulation's can be composed
171−-- monadically just like 'Query's, but the resulting join is more like a
172−-- @NATURAL JOIN@ (based on the common key column(s) @k@) than the
173−-- @CROSS JOIN@ given by 'Query'.
174−--
175−-- Another way to think of @'Tabulation' k a@ is as analogous to @Map k a@ in
176−-- the same way @'Query' a@ is analogous to @[a]@. However, there's nothing
177−-- stopping a 'Tabulation' from containing multiple rows with the same key, so
178−-- technically @Map k (NonEmpty a)@ is more accurate.
179−--
180−-- 'Tabulation's can be created from 'Query's with 'fromQuery' and 'liftQuery'
181−-- and converted back to 'Query's with 'lookup' and 'toQuery' (though note the
182−-- caveats that come with the latter).
183−type Tabulation :: Type -> Type -> Type
184−newtype Tabulation k a = Tabulation (Predicate k -> Query (Key k, a))
185
61
186
62
187−instance Biprojectable Tabulation where
63+newtype Tabulation k a = Tabulation (k -> Query (Maybe k, a))
188− biproject f g =
64+ deriving stock Functor
189− bimap
190− (fromColumns . apply f . toColumns)
191− (fromColumns . apply g . toColumns)
192
65
193
66
194−instance Bifunctor Tabulation where
195− bimap f g (Tabulation a) = Tabulation $ \p ->
196− bimap (fmap f) g <$> a (f >$< p)
197−
198−
199−instance Functor (Tabulation k) where
200− fmap = second
201−
202−
203−instance Projectable (Tabulation k) where
204− project f = fmap (fromColumns . apply f . toColumns)
205−
206−
207−-- | If @'Tabulation' k a@ is @Map k (NonEmpty a)@, then @(<.>)@ is
208−-- @intersectionWith (liftA2 (<*>))@
209instance EqTable k => Apply (Tabulation k) where
67instance EqTable k => Apply (Tabulation k) where
210 liftF2 = liftA2
68 liftF2 = liftA2
211
69
212
70
213−-- | @pure = 'liftQuery' . pure@
214instance EqTable k => Applicative (Tabulation k) where
71instance EqTable k => Applicative (Tabulation k) where
215 pure = liftQuery . pure
72 pure = liftQuery . pure
216 liftA2 = liftM2
73 liftA2 = liftM2
217
74
218
75
219instance EqTable k => Bind (Tabulation k) where
76instance EqTable k => Bind (Tabulation k) where
220− Tabulation as >>- f = Tabulation $ \p -> do
77+ join = join
221− (k, a) <- as p
222− case f a of
223− Tabulation bs -> do
224− let p' = match k
225− (k', b) <- bs (p' <> p)
226− ensure p' k'
227− pure (k' <|> k, b)
228
78
229
79
230instance EqTable k => Monad (Tabulation k) where
80instance EqTable k => Monad (Tabulation k) where
231− (>>=) = (>>-)
81+ Tabulation as >>= f = Tabulation $ \i -> do
82+ (mk, a) <- as i
83+ case mk of
84+ Nothing -> case f a of
85+ Tabulation bs -> bs i
86+ Just k -> case f a of
87+ Tabulation bs -> do
88+ (mk', b) <- bs k
89+ case mk' of
90+ Nothing -> pure (mk, b)
91+ Just k' -> do
92+ where_ $ k ==: k'
93+ pure (mk', b)
94+
95+
96+runTabulation :: EqTable k => Tabulation k a -> Query (k, a)
97+runTabulation (Tabulation f) = do
98+ (mk, a) <- f i
99+ case mk of
100+ Nothing -> do
101+ -- Opaleye tries to be too clever optimising "WHERE FALSE" and generates
102+ -- invalid SQL, so we use "WHERE NOT TRUE" instead
103+ where_ $ not_ true
104+ pure (i, a)
105+ Just k -> pure (k, a)
106+ where
107+ i = undefined
232
108
233
109
234−-- | If @'Tabulation' k a@ is @Map k (NonEmpty a)@, then @(<|>:)@ is
110+liftQuery :: Query a -> Tabulation k a
235−-- @unionWith (<>)@.
111+liftQuery query = Tabulation $ const $ fmap (Nothing,) query
236−instance EqTable k => AltTable (Tabulation k) where
237− tas <|>: tbs = do
238− eas <- peek tas
239− ebs <- peek tbs
240− case (eas, ebs) of
241− (Left as, Left bs) -> liftQuery $ as <|>: bs
242− (Right as, Right bs) -> fromQuery $ as <|>: bs
243− _ -> catNonEmptyTable `through` ((<>) `on` some) tas tbs
244
112
245
113
246−instance EqTable k => AlternativeTable (Tabulation k) where
114+tabulate :: (a -> k) -> a -> Tabulation k a
247− emptyTable = Tabulation $ const $ fmap (empty,) emptyTable
115+tabulate key a = fromQuery $ pure (key a, a)
248
116
249
117
250−-- | If @'Tabulation' k a@ is @Map k (NonEmpty a)@, then @(<>)@ is
118+tabulateA :: (a -> Query k) -> a -> Tabulation k a
251−-- @unionWith (liftA2 (<>))@.
119+tabulateA key a = fromQuery $ (,a) <$> key a
252−instance (EqTable k, Table Expr a, Semigroup a) => Semigroup (Tabulation k a)
253− where
254− (<>) = alignWith (theseTable id id (<>))
255
120
256
121
257−instance (EqTable k, Table Expr a, Semigroup a) => Monoid (Tabulation k a)
122+fromQuery :: Query (k, a) -> Tabulation k a
258− where
123+fromQuery = Tabulation . const . fmap (first Just)
259− mempty = emptyTable
260
124
261
125
262−-- | Any 'Query' of key-value pairs @(k, a)@ can be a @'Tabulation' k a@.
126+indexed :: Tabulation k a -> Tabulation k (k, a)
263−fromQuery :: Query (k, a) -> Tabulation k a
127+indexed (Tabulation query) = Tabulation $ \i ->
264−fromQuery = Tabulation . const . fmap (first pure)
128+ (\(mk, a) -> (mk, (fromMaybe i mk, a))) <$> query i
265−
266−
267−-- | Convert a @'Tabulation' k a@ back into a 'Query' of key-value pairs.
268−--
269−-- Note that the result of a 'toQuery' is undefined (will always return zero
270−-- rows) on 'Tabulation's constructed with 'liftQuery' or 'pure'. So while
271−-- @toQuery . fromQuery@ is always @id@, @fromQuery . toQuery@ is not.
272−--
273−-- A safer, more predictable alternative to 'toQuery' is to use 'lookup' with
274−-- an explicit set of keys:
275−--
276−-- @
277−-- do
278−-- k <- keys
279−-- a <- lookup k tabulation
280−-- pure (k, a)
281−-- @
282−--
283−-- Having said that, in practice, most legitimate uses of 'Tabulation' will
284−-- have a well-defined 'toQuery'. It would be possible in theory to encode
285−-- the necessary invariants at the type level using an indexed monad, but we
286−-- would lose the ability to use @do@-notation, which is the main benefit
287−-- of having 'Tabulation' as a monad in the first place.
288−--
289−-- In particular, @'toQuery' t@ is well-defined for any 'Tabulation' @t@
290−-- defined as @t = fromQuery _@. @'toQuery' t@ is also well-defined for any
291−-- 'Tabulation' @t@ defined as @t = t' >>= _@ or @t = t' *> _@ where
292−-- @'toQuery' t'@ is well-defined. There are other valid permutations too.
293−-- Generally, anything that uses 'fromQuery' at some point, unless wrapped in
294−-- a top-level 'present' or 'absent', will have a well-defined 'toQuery'.
295−toQuery :: Table Expr k => Tabulation k a -> Query (k, a)
296−toQuery (Tabulation f) = do
297− (mk, a) <- f mempty
298− k <- cat mk
299− pure (k, a)
300−
301−
302−-- | A @'Query' a@ can be treated as a @'Tabulation' k a@ where the given @a@
303−-- values exist at every possible key @k@.
304−liftQuery :: Query a -> Tabulation k a
305−liftQuery = Tabulation . const . fmap (empty,)
306
129
307
130
308−-- | Run a Kleisli arrow in the the 'Query' monad \"through\" a 'Tabulation'.
131+ifilter :: (k -> a -> Expr Bool) -> Tabulation k a -> Tabulation k a
309−-- Useful for 'Rel8.filter'ing a 'Tabulation'.
132+ifilter f tabulation = snd <$> do
310−--
133+ filter (uncurry f) `postbind` indexed tabulation
311−-- @
312−-- 'Rel8.filter' ((>=. 30) . userAge) `'through'` usersById
313−-- @
314−through :: (a -> Query b) -> Tabulation k a -> Tabulation k b
315−through f (Tabulation as) = Tabulation $ \p -> do
316− (k, a) <- as p
317− b <- f a
318− pure (k, b)
319−infixr 1 `through`
320
134
321
135
322−-- | @'lookup' k t@ returns the value(s) at the key @k@ in the tabulation @t@.
136+prebind :: (a -> Tabulation k b) -> Query a -> Tabulation k b
323−lookup :: EqTable k => k -> Tabulation k a -> Query a
137+prebind f as = Tabulation $ \k -> do
324−lookup k (Tabulation f) = do
138+ a <- as
325− (k', a) <- f p
139+ case f a of
326− ensure p k'
140+ Tabulation query -> query k
327− pure a
141+infixr 1 `prebind`
328− where
329− p = match (pure k)
330
142
331
143
332−-- | 'aggregate' aggregates the values within each key of a
144+postbind :: (a -> Query b) -> Tabulation k a -> Tabulation k b
333−-- 'Tabulation'. There is an implicit @GROUP BY@ on all the key columns.
145+postbind f (Tabulation as) = Tabulation $ \i -> do
334−aggregate :: forall k aggregates exprs.
146+ (k, a) <- as i
335− ( EqTable k
147+ case f a of
336− , Aggregates aggregates exprs
148+ bs -> do
337− )
149+ b <- bs
338− => Tabulation k aggregates -> Tabulation k exprs
150+ pure (k, b)
339−aggregate (Tabulation f) = Tabulation $
151+infixr 1 `postbind`
340− mapOpaleye (Opaleye.aggregate (keyed haggregator aggregator)) .
341− fmap (first (fmap (hgroupBy (eqTable @k) . toColumns))) .
342− f
343− where
344− haggregator = dimap fromColumns fromCols aggregator
345
152
346
153
347−-- | 'distinct' ensures a 'Tabulation' has at most one value for
154+lookup :: EqTable k => k -> Tabulation k a -> Query a
348−-- each key, i.e., it drops duplicates. In general it keeps only the
155+lookup key (Tabulation query) = do
349−-- \"first\" value it encounters for each key, but note that \"first\" is
156+ (mk, a) <- query key
350−-- undefined unless you first call 'order'.
157+ traverse_ (where_ . (key ==:)) mk
351−distinct :: EqTable k => Tabulation k a -> Tabulation k a
158+ pure a
352−distinct (Tabulation f) = Tabulation $
353− mapOpaleye (Opaleye.distinctOnExplicit (key unpackspec) fst) . f
354
159
355
160
356−-- | 'order' orders the /values/ of a 'Tabulation' within their
161+align :: (EqTable k, Table Expr a, Table Expr b)
357−-- respective keys. This specifies a defined order for 'distinct'.
162+ => Tabulation k a -> Tabulation k b -> Tabulation k (TheseTable a b)
358−-- It also defines the order of the lists produced by 'many' and
359−-- 'some'.
360−order :: OrdTable k => Order a -> Tabulation k a -> Tabulation k a
361−order ordering (Tabulation f) =
362− Tabulation $ mapOpaleye (Opaleye.orderBy ordering') . f
363− where
364− Order ordering' = runClown (keyed (Clown ascTable) (Clown ordering))
365−
366−
367−-- $magic
368−--
369−-- Some of the following combinators produce \"magic\" 'Tabulation's. Let's
370−-- use 'count' as an example to demonstrate this concept. Consider
371−-- the following:
372−--
373−-- @
374−-- count $ fromQuery $ values
375−-- [ (lit 'a', lit True)
376−-- , (lit 'a', lit False)
377−-- , (lit 'b', lit True)
378−-- ]
379−-- @
380−--
381−-- You might expect this to be equivalent to the following 'Tabulation':
382−--
383−-- @
384−-- fromQuery $ values
385−-- [ (lit 'a', 2)
386−-- , (lit 'b', 1)
387−-- ]
388−-- @
389−--
390−-- However, it isn't quite. While the resulting 'Tabulation' does effectively
391−-- contain the above entries, it also behaves as though it contained the value
392−-- @0@ at every other possible key.
393−--
394−-- This means you can do:
395−--
396−-- @
397−-- do
398−-- user <- usersById
399−-- orderCount <- count ordersByUserId
400−-- @
401−--
402−-- To see how many orders a user has (getting @0@ if they have no orders).
403−
404−
405−-- | 'count' returns a count of how many entries are in the given
406−-- 'Tabulation' at each key.
407−--
408−-- The resulting 'Tabulation' is \"magic\" in that the value @0@ exists at
409−-- every possible key that wasn't in the given 'Tabulation'.
410−count :: EqTable k => Tabulation k a -> Tabulation k (Expr Int64)
411−count =
412− fmap (maybeTable 0 id) .
413− optional .
414− aggregate .
415− fmap (const countStar)
416−
417−
418−-- | 'optional' produces a \"magic\" 'Tabulation' whereby each
419−-- entry in the given 'Tabulation' is wrapped in 'Rel8.justTable', and every
420−-- other possible key contains a single 'Rel8.nothingTable'.
421−--
422−-- This is used to implement 'leftAlignWith'.
423−optional :: Tabulation k a -> Tabulation k (MaybeTable Expr a)
424−optional (Tabulation f) = Tabulation $ \p -> case p of
425− Predicate Nothing -> fmap pure <$> f p
426− _ -> fmap (\m -> (empty, snd <$> m)) $ Q.optional $ do
427− (k, a) <- f p
428− ensure p k
429− pure (k, a)
430−
431−
432−-- | 'many' aggregates each entry with a particular key into a
433−-- single entry with all of the values contained in a 'ListTable'.
434−--
435−-- 'order' can be used to give this 'ListTable' a defined order.
436−--
437−-- The resulting 'Tabulation' is \"magic\" in that the value
438−-- @'Rel8.listTable []'@ exists at every possible key that wasn't in the given
439−-- 'Tabulation'.
440−many :: (EqTable k, Table Expr a)
441− => Tabulation k a -> Tabulation k (ListTable Expr a)
442−many =
443− fmap (maybeTable mempty (\(ListTable a) -> ListTable a)) .
444− optional .
445− aggregate .
446− fmap (listAgg . toCols)
447−
448−
449−-- | 'some' aggregates each entry with a particular key into a
450−-- single entry with all of the values contained in a 'NonEmptyTable'.
451−--
452−-- 'order' can be used to give this 'NonEmptyTable' a defined order.
453−some :: (EqTable k, Table Expr a)
454− => Tabulation k a -> Tabulation k (NonEmptyTable Expr a)
455−some =
456− fmap (\(NonEmptyTable a) -> NonEmptyTable a) .
457− aggregate .
458− fmap (nonEmptyAgg . toCols)
459−
460−
461−-- | 'exists' produces a \"magic\" 'Tabulation' which contains the
462−-- value 'Rel8.true' at each key in the given 'Tabulation', and the value
463−-- 'Rel8.false' at every other possible key.
464−exists :: Tabulation k a -> Tabulation k (Expr Bool)
465−exists (Tabulation f) = Tabulation $ \p -> case p of
466− Predicate Nothing -> (true <$) <$> f p
467− _ -> fmap (empty,) $ Q.exists $ do
468− (k, _) <- f p
469− ensure p k
470−
471−
472−-- | 'present' produces a 'Tabulation' where a single @()@ row
473−-- exists for every key that was present in the given 'Tabulation'.
474−--
475−-- This is used to implement 'similarity'.
476−present :: Tabulation k a -> Tabulation k ()
477−present (Tabulation f) = Tabulation $ \p -> do
478− Q.present $ do
479− (k, _) <- f p
480− ensure p k
481− pure (empty, ())
482−
483−
484−-- | 'absent' produces a 'Tabulation' where a single @()@ row exists
485−-- at every possible key that absent from the given 'Tabulation'.
486−--
487−-- This is used to implement 'difference'.
488−absent :: Tabulation k a -> Tabulation k ()
489−absent (Tabulation f) = Tabulation $ \p -> do
490− Q.absent $ do
491− (k, _) <- f p
492− ensure p k
493− pure (empty, ())
494−
495−
496−-- | Performs a @NATURAL FULL OUTER JOIN@ based on the common key columns.
497−--
498−-- Analogous to 'Data.Semialign.align'.
499−align :: EqTable k
500− => Tabulation k a -> Tabulation k b -> Tabulation k (TheseTable Expr a b)
501align = alignWith id
163align = alignWith id
502
164
503
165
504−-- | Performs a @NATURAL FULL OUTER JOIN@ based on the common key columns.
166+alignWith :: (EqTable k, Table Expr a, Table Expr b)
505−--
167+ => (TheseTable a b -> c)
506−-- Analogous to 'Data.Semialign.alignWith'.
507−alignWith :: EqTable k
508− => (TheseTable Expr a b -> c)
509 -> Tabulation k a -> Tabulation k b -> Tabulation k c
168 -> Tabulation k a -> Tabulation k b -> Tabulation k c
510−alignWith f (Tabulation as) (Tabulation bs) = Tabulation $ \p -> do
169+alignWith f kas kbs = do
511− tkab <- liftF2 (alignBy condition) as bs p
170+ as <- toQuery kas
512− k <- traverse (rebind "key") $ recover $ bimap fst fst tkab
171+ bs <- toQuery kbs
513− let
172+ fromQuery $ do
514− tab = bimap snd snd tkab
173+ tkab <- alignBy (\(l, _) (m, _) -> l ==: m) as bs
515− pure (k, f tab)
174+ let
516− where
175+ k' = theseTable fst fst (const fst) tkab
517− condition (k, _) (k', _) = fromMaybe true (liftA2 (==:) k k')
176+ tab = bimap snd snd tkab
518− recover (TheseTable mma@(MaybeTable _ ma) mmb@(MaybeTable _ mb)) =
177+ pure (k', f tab)
519− case extract ma of
178+
520− Nothing -> extract mb
179+
521− Just a -> case extract mb of
522− Nothing -> extract ma
523− Just b -> case a <$ mma <|>: b <$ mmb of
524− MaybeTable _ c -> pure (extract c)
525−
526−
527−-- | Performs a @NATURAL LEFT OUTER JOIN@ based on the common key columns.
528−--
529−-- Analogous to 'Data.Semialign.rpadZip'.
530−--
531−-- Note that you can achieve the same effect with 'optional' and the
532−-- 'Applicative' instance for 'Tabulation', i.e., this is just
533−-- @\left right -> liftA2 (,) left (optional right). You can also
534−-- use @do@-notation.
535leftAlign :: EqTable k
180leftAlign :: EqTable k
536− => Tabulation k a -> Tabulation k b -> Tabulation k (a, MaybeTable Expr b)
181+ => Tabulation k a -> Tabulation k b -> Tabulation k (a, MaybeTable b)
537leftAlign = leftAlignWith (,)
182leftAlign = leftAlignWith (,)
538
183
539
184
540−-- | Performs a @NATURAL LEFT OUTER JOIN@ based on the common key columns.
541−--
542−-- Analogous to 'Data.Semialign.rpadZipWith'.
543−--
544−-- Note that you can achieve the same effect with 'optional' and the
545−-- 'Applicative' instance for 'Tabulation', i.e., this is just
546−-- @\f left right -> liftA2 f left (optional right). You can also
547−-- use @do@-notation.
548leftAlignWith :: EqTable k
185leftAlignWith :: EqTable k
549− => (a -> MaybeTable Expr b -> c)
186+ => (a -> MaybeTable b -> c)
550 -> Tabulation k a -> Tabulation k b -> Tabulation k c
187 -> Tabulation k a -> Tabulation k b -> Tabulation k c
551−leftAlignWith f left right = liftA2 f left (optional right)
188+leftAlignWith f left right = liftA2 f left (optionalTabulation right)
552−
553−
554−-- | Performs a @NATURAL RIGHT OUTER JOIN@ based on the common key columns.
555−--
556−-- Analogous to 'Data.Semialign.lpadZip'.
557−--
558−-- Note that you can achieve the same effect with 'optional' and the
559−-- 'Applicative' instance for 'Tabulation', i.e., this is just
560−-- @\left right -> liftA2 (flip (,)) right (optional left). You can
561−-- also use @do@-notation.
562−rightAlign :: EqTable k
563− => Tabulation k a -> Tabulation k b -> Tabulation k (MaybeTable Expr a, b)
564−rightAlign = rightAlignWith (,)
565−
566−
567−-- | Performs a @NATURAL RIGHT OUTER JOIN@ based on the common key columns.
568−--
569−-- Analogous to 'Data.Semialign.lpadZipWith'.
570−--
571−-- Note that you can achieve the same effect with 'optional' and the
572−-- 'Applicative' instance for 'Tabulation', i.e., this is just
573−-- @\f left right -> liftA2 (flip f) right (optional left). You can
574−-- also use @do@-notation.
575−rightAlignWith :: EqTable k
576− => (MaybeTable Expr a -> b -> c)
577− -> Tabulation k a -> Tabulation k b -> Tabulation k c
578−rightAlignWith f left right = liftA2 (flip f) right (optional left)
579
189
580
190
581−-- | Performs a @NATURAL INNER JOIN@ based on the common key columns.
582−--
583−-- Analagous to 'Data.Semialign.zip'.
584−--
585−-- Note that you can achieve the same effect with the 'Applicative' instance
586−-- of 'Tabulation', i.e., this is just @'liftA2 (,)'@. You can also use
587−-- @do@-notation.
588zip :: EqTable k
191zip :: EqTable k
589 => Tabulation k a -> Tabulation k b -> Tabulation k (a, b)
192 => Tabulation k a -> Tabulation k b -> Tabulation k (a, b)
590zip = zipWith (,)
193zip = zipWith (,)
591
194
592
195
593−-- | Performs a @NATURAL INNER JOIN@ based on the common key columns.
594−--
595−-- Analagous to 'Data.Semialign.zipWith'.
596−--
597−-- Note that you can achieve the same effect with the 'Applicative' instance
598−-- of 'Tabulation', i.e., this is just @'liftA2'@. You can also use
599−-- @do@-notation.
600zipWith :: EqTable k
196zipWith :: EqTable k
601 => (a -> b -> c) -> Tabulation k a -> Tabulation k b -> Tabulation k c
197 => (a -> b -> c) -> Tabulation k a -> Tabulation k b -> Tabulation k c
602zipWith = liftA2
198zipWith = liftA2
603
199
604
200
605−-- | Performs a [@NATURAL SEMI JOIN@](https://en.wikipedia.org/wiki/Relational_algebra#Semijoin_%28%E2%8B%89%29%28%E2%8B%8A%29)
606−-- based on the common key columns.
607−--
608−-- The result is a subset of the left tabulation where only entries which have
609−-- a corresponding entry in the right tabulation are kept.
610−--
611−-- Note that you can achieve a similar effect with 'present' and the
612−-- 'Applicative' instance of 'Tabulation', i.e., this is just
613−-- @\left right -> left <* present right@. You can also use
614−-- @do@-notation.
615similarity :: EqTable k => Tabulation k a -> Tabulation k b -> Tabulation k a
201similarity :: EqTable k => Tabulation k a -> Tabulation k b -> Tabulation k a
616−similarity a b = a <* present b
202+similarity kas kbs = do
617−
203+ as <- toQuery kas
618−
204+ bs <- toQuery kbs
619−-- | Performs a [@NATURAL ANTI JOIN@](https://en.wikipedia.org/wiki/Relational_algebra#Antijoin_%28%E2%96%B7%29)
205+ fromQuery $ as >>= withBy (\(k, _) (l, _) -> k ==: l) bs
620−-- based on the common key columns.
206+
621−--
207+
622−-- The result is a subset of the left tabulation where only entries which do
623−-- not have a corresponding entry in the right tabulation are kept.
624−--
625−-- Note that you can achieve a similar effect with 'absent' and the
626−-- 'Applicative' instance of 'Tabulation', i.e., this is just
627−-- @\left right -> left <* absent right@. You can also use
628−-- @do@-notation.
629difference :: EqTable k => Tabulation k a -> Tabulation k b -> Tabulation k a
208difference :: EqTable k => Tabulation k a -> Tabulation k b -> Tabulation k a
630−difference a b = a <* absent b
209+difference kas kbs = do
210+ as <- toQuery kas
211+ bs <- toQuery kbs
212+ fromQuery $ as >>= withoutBy (\(k, _) (l, _) -> k ==: l) bs
213+
214+
215+aggregateTabulation :: EqTable k
216+ => Tabulation k (Aggregate a) -> Tabulation k a
217+aggregateTabulation kas = do
218+ as <- toQuery kas
219+ fromQuery $ aggregate $ bitraverse1 groupBy id <$> as
220+
221+
222+optionalTabulation :: EqTable k
223+ => Tabulation k a -> Tabulation k (MaybeTable a)
224+optionalTabulation as = Tabulation $ \k -> do
225+ ma <- optional $ lookup k as
226+ pure (Just k, ma)
631
227
632
228
633−-- | 'Tabulation's can be produced with either 'fromQuery' or 'liftQuery', and
229+toQuery :: Tabulation k a -> Tabulation k (Query (k, a))
634−-- in some cases we might want to treat these differently. 'peek' uses
230+toQuery (Tabulation as) = Tabulation $ \k ->
635−-- 'unsafePeekQuery' to determine which type of 'Tabulation' we have.
231+ pure (Nothing, first (fromMaybe k) <$> as k)
636−peek :: Tabulation k a -> Tabulation k (Either (Query a) (Query (k, a)))
637−peek (Tabulation f) = Tabulation $ \p ->
638− pure $ (empty,) $ case unsafePeekQuery (f p) of
639− (Nothing, _) -> Left $ fmap snd (f p)
640− (Just _, _) -> Right $ fmap (first fromJust) (f p)
src/Rel8/Type.hs+50−16
@@ -1,8 +1,8 @@
1−{-# language FlexibleContexts #-}
2{-# language FlexibleInstances #-}
1{-# language FlexibleInstances #-}
3−{-# language MonoLocalBinds #-}
2+{-# language MultiParamTypeClasses #-}
4−{-# language MultiWayIf #-}
5{-# language StandaloneKindSignatures #-}
3{-# language StandaloneKindSignatures #-}
4+{-# language TypeApplications #-}
5+{-# language UndecidableInstances #-}
6{-# language UndecidableInstances #-}
6{-# language UndecidableInstances #-}
7
7
8module Rel8.Type
8module Rel8.Type
@@ -37,7 +37,12 @@ import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
37import qualified Opaleye.Internal.HaskellDB.Sql.Default as Opaleye ( quote )
37import qualified Opaleye.Internal.HaskellDB.Sql.Default as Opaleye ( quote )
38
38
39-- rel8
39-- rel8
40−import Rel8.Schema.Null ( NotNull, Sql, nullable )
40+import Rel8.Opaque ( Opaque )
41+import Rel8.Schema.Nullability
42+ ( NotNull, Unnullify
43+ , HasNullability, nullabilization
44+ , Sql
45+ )
41import Rel8.Type.Array ( listTypeInformation, nonEmptyTypeInformation )
46import Rel8.Type.Array ( listTypeInformation, nonEmptyTypeInformation )
42import Rel8.Type.Information ( TypeInformation(..), mapTypeInformation )
47import Rel8.Type.Information ( TypeInformation(..), mapTypeInformation )
43
48
@@ -74,6 +79,18 @@ import qualified Data.UUID as UUID
74-- should only need to derive instances of this class for custom database
79-- should only need to derive instances of this class for custom database
75-- types, such as types defined in PostgreSQL extensions, or custom domain
80-- types, such as types defined in PostgreSQL extensions, or custom domain
76-- types.
81-- types.
82+--
83+-- [ Creating @DBType@s using @newtype@ ]
84+--
85+-- Generalized newtype deriving can be used when you want use a @newtype@
86+-- around a database type for clarity and accuracy in your Haskell code. A
87+-- common example is to @newtype@ row id types:
88+--
89+-- >>> newtype UserId = UserId { toInt32 :: Int32 } deriving newtype (DBType)
90+--
91+-- You can now write queries using @UserId@ instead of @Int32@, which may help
92+-- avoid making bad joins. However, when SQL is generated, it will be as if you
93+-- just used integers (the type distinction does not impact query generation).
77type DBType :: Type -> Constraint
94type DBType :: Type -> Constraint
78class NotNull a => DBType a where
95class NotNull a => DBType a where
79 typeInformation :: TypeInformation a
96 typeInformation :: TypeInformation a
@@ -85,6 +102,7 @@ instance DBType Bool where
85 { encode = Opaleye.ConstExpr . Opaleye.BoolLit
102 { encode = Opaleye.ConstExpr . Opaleye.BoolLit
86 , decode = Hasql.bool
103 , decode = Hasql.bool
87 , typeName = "bool"
104 , typeName = "bool"
105+ , out = id
88 }
106 }
89
107
90
108
@@ -94,6 +112,7 @@ instance DBType Char where
94 { encode = Opaleye.ConstExpr . Opaleye.StringLit . pure
112 { encode = Opaleye.ConstExpr . Opaleye.StringLit . pure
95 , decode = Hasql.char
113 , decode = Hasql.char
96 , typeName = "char"
114 , typeName = "char"
115+ , out = id
97 }
116 }
98
117
99
118
@@ -103,6 +122,7 @@ instance DBType Int16 where
103 { encode = Opaleye.ConstExpr . Opaleye.IntegerLit . toInteger
122 { encode = Opaleye.ConstExpr . Opaleye.IntegerLit . toInteger
104 , decode = Hasql.int2
123 , decode = Hasql.int2
105 , typeName = "int2"
124 , typeName = "int2"
125+ , out = id
106 }
126 }
107
127
108
128
@@ -112,6 +132,7 @@ instance DBType Int32 where
112 { encode = Opaleye.ConstExpr . Opaleye.IntegerLit . toInteger
132 { encode = Opaleye.ConstExpr . Opaleye.IntegerLit . toInteger
113 , decode = Hasql.int4
133 , decode = Hasql.int4
114 , typeName = "int4"
134 , typeName = "int4"
135+ , out = id
115 }
136 }
116
137
117
138
@@ -121,32 +142,27 @@ instance DBType Int64 where
121 { encode = Opaleye.ConstExpr . Opaleye.IntegerLit . toInteger
142 { encode = Opaleye.ConstExpr . Opaleye.IntegerLit . toInteger
122 , decode = Hasql.int8
143 , decode = Hasql.int8
123 , typeName = "int8"
144 , typeName = "int8"
145+ , out = id
124 }
146 }
125
147
126
148
127-- | Corresponds to @float4@
149-- | Corresponds to @float4@
128instance DBType Float where
150instance DBType Float where
129 typeInformation = TypeInformation
151 typeInformation = TypeInformation
130− { encode = \x -> Opaleye.ConstExpr
152+ { encode = Opaleye.ConstExpr . Opaleye.NumericLit . realToFrac
131− if | x == (1 / 0) -> Opaleye.OtherLit "'Infinity'"
132− | isNaN x -> Opaleye.OtherLit "'NaN'"
133− | x == (-1 / 0) -> Opaleye.OtherLit "'-Infinity'"
134− | otherwise -> Opaleye.NumericLit $ realToFrac x
135 , decode = Hasql.float4
153 , decode = Hasql.float4
136 , typeName = "float4"
154 , typeName = "float4"
155+ , out = id
137 }
156 }
138
157
139
158
140-- | Corresponds to @float8@
159-- | Corresponds to @float8@
141instance DBType Double where
160instance DBType Double where
142 typeInformation = TypeInformation
161 typeInformation = TypeInformation
143− { encode = \x -> Opaleye.ConstExpr
162+ { encode = Opaleye.ConstExpr . Opaleye.NumericLit . realToFrac
144− if | x == (1 / 0) -> Opaleye.OtherLit "'Infinity'"
145− | isNaN x -> Opaleye.OtherLit "'NaN'"
146− | x == (-1 / 0) -> Opaleye.OtherLit "'-Infinity'"
147− | otherwise -> Opaleye.NumericLit $ realToFrac x
148 , decode = Hasql.float8
163 , decode = Hasql.float8
149 , typeName = "float8"
164 , typeName = "float8"
165+ , out = id
150 }
166 }
151
167
152
168
@@ -156,6 +172,7 @@ instance DBType Scientific where
156 { encode = Opaleye.ConstExpr . Opaleye.NumericLit
172 { encode = Opaleye.ConstExpr . Opaleye.NumericLit
157 , decode = Hasql.numeric
173 , decode = Hasql.numeric
158 , typeName = "numeric"
174 , typeName = "numeric"
175+ , out = id
159 }
176 }
160
177
161
178
@@ -167,6 +184,7 @@ instance DBType UTCTime where
167 formatTime defaultTimeLocale "'%FT%T%QZ'"
184 formatTime defaultTimeLocale "'%FT%T%QZ'"
168 , decode = Hasql.timestamptz
185 , decode = Hasql.timestamptz
169 , typeName = "timestamptz"
186 , typeName = "timestamptz"
187+ , out = id
170 }
188 }
171
189
172
190
@@ -178,6 +196,7 @@ instance DBType Day where
178 formatTime defaultTimeLocale "'%F'"
196 formatTime defaultTimeLocale "'%F'"
179 , decode = Hasql.date
197 , decode = Hasql.date
180 , typeName = "date"
198 , typeName = "date"
199+ , out = id
181 }
200 }
182
201
183
202
@@ -189,6 +208,7 @@ instance DBType LocalTime where
189 formatTime defaultTimeLocale "'%FT%T%Q'"
208 formatTime defaultTimeLocale "'%FT%T%Q'"
190 , decode = Hasql.timestamp
209 , decode = Hasql.timestamp
191 , typeName = "timestamp"
210 , typeName = "timestamp"
211+ , out = id
192 }
212 }
193
213
194
214
@@ -200,6 +220,7 @@ instance DBType TimeOfDay where
200 formatTime defaultTimeLocale "'%T%Q'"
220 formatTime defaultTimeLocale "'%T%Q'"
201 , decode = Hasql.time
221 , decode = Hasql.time
202 , typeName = "time"
222 , typeName = "time"
223+ , out = id
203 }
224 }
204
225
205
226
@@ -211,6 +232,7 @@ instance DBType CalendarDiffTime where
211 formatTime defaultTimeLocale "'%bmon %0Es'"
232 formatTime defaultTimeLocale "'%bmon %0Es'"
212 , decode = CalendarDiffTime 0 . realToFrac <$> Hasql.interval
233 , decode = CalendarDiffTime 0 . realToFrac <$> Hasql.interval
213 , typeName = "interval"
234 , typeName = "interval"
235+ , out = id
214 }
236 }
215
237
216
238
@@ -220,6 +242,7 @@ instance DBType Text where
220 { encode = Opaleye.ConstExpr . Opaleye.StringLit . Text.unpack
242 { encode = Opaleye.ConstExpr . Opaleye.StringLit . Text.unpack
221 , decode = Hasql.text
243 , decode = Hasql.text
222 , typeName = "text"
244 , typeName = "text"
245+ , out = id
223 }
246 }
224
247
225
248
@@ -249,6 +272,7 @@ instance DBType ByteString where
249 { encode = Opaleye.ConstExpr . Opaleye.ByteStringLit
272 { encode = Opaleye.ConstExpr . Opaleye.ByteStringLit
250 , decode = Hasql.bytea
273 , decode = Hasql.bytea
251 , typeName = "bytea"
274 , typeName = "bytea"
275+ , out = id
252 }
276 }
253
277
254
278
@@ -265,6 +289,7 @@ instance DBType UUID where
265 { encode = Opaleye.ConstExpr . Opaleye.StringLit . UUID.toString
289 { encode = Opaleye.ConstExpr . Opaleye.StringLit . UUID.toString
266 , decode = Hasql.uuid
290 , decode = Hasql.uuid
267 , typeName = "uuid"
291 , typeName = "uuid"
292+ , out = id
268 }
293 }
269
294
270
295
@@ -277,12 +302,21 @@ instance DBType Value where
277 Lazy.unpack . Lazy.decodeUtf8 . Aeson.encode
302 Lazy.unpack . Lazy.decodeUtf8 . Aeson.encode
278 , decode = Hasql.jsonb
303 , decode = Hasql.jsonb
279 , typeName = "jsonb"
304 , typeName = "jsonb"
305+ , out = id
280 }
306 }
281
307
282
308
283instance Sql DBType a => DBType [a] where
309instance Sql DBType a => DBType [a] where
284− typeInformation = listTypeInformation nullable typeInformation
310+ typeInformation = listTypeInformation nullabilization typeInformation
285
311
286
312
287instance Sql DBType a => DBType (NonEmpty a) where
313instance Sql DBType a => DBType (NonEmpty a) where
288− typeInformation = nonEmptyTypeInformation nullable typeInformation
314+ typeInformation = nonEmptyTypeInformation nullabilization typeInformation
315+
316+
317+instance {-# OVERLAPPING #-} DBType Opaque where
318+ typeInformation = error "opaque"
319+
320+
321+instance {-# INCOHERENT #-} (HasNullability a, DBType (Unnullify a)) =>
322+ Sql DBType a
src/Rel8/Type/Array.hs+32−52
@@ -1,13 +1,12 @@
1{-# language GADTs #-}
1{-# language GADTs #-}
2−{-# language LambdaCase #-}
3{-# language NamedFieldPuns #-}
2{-# language NamedFieldPuns #-}
4{-# language OverloadedStrings #-}
3{-# language OverloadedStrings #-}
5−{-# language ViewPatterns #-}
6
4
7module Rel8.Type.Array
5module Rel8.Type.Array
8− ( array, encodeArrayElement, extractArrayElement
6+ ( array
9 , listTypeInformation
7 , listTypeInformation
10 , nonEmptyTypeInformation
8 , nonEmptyTypeInformation
9+ , fromPrimArray, toPrimArray, zipPrimArraysWith
11 )
10 )
12where
11where
13
12
@@ -23,78 +22,59 @@ import qualified Hasql.Decoders as Hasql
23import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
22import qualified Opaleye.Internal.HaskellDB.PrimQuery as Opaleye
24
23
25-- rel8
24-- rel8
26−import Rel8.Schema.Null ( Unnullify, Nullity( Null, NotNull ) )
25+import Rel8.Schema.Nullability ( Unnullify, Nullability( Nullable, NonNullable ) )
27import Rel8.Type.Information ( TypeInformation(..), parseTypeInformation )
26import Rel8.Type.Information ( TypeInformation(..), parseTypeInformation )
28
27
29
28
30array :: Foldable f
29array :: Foldable f
31 => TypeInformation a -> f Opaleye.PrimExpr -> Opaleye.PrimExpr
30 => TypeInformation a -> f Opaleye.PrimExpr -> Opaleye.PrimExpr
32−array info =
31+array TypeInformation {typeName} =
33− Opaleye.CastExpr (arrayType info <> "[]") .
32+ fromPrimArray .
34− Opaleye.ArrayExpr . map (encodeArrayElement info) . toList
33+ Opaleye.CastExpr (typeName <> "[]") .
35−{-# INLINABLE array #-}
34+ Opaleye.ArrayExpr . toList
36
35
37
36
38listTypeInformation :: ()
37listTypeInformation :: ()
39− => Nullity a
38+ => Nullability a
40 -> TypeInformation (Unnullify a)
39 -> TypeInformation (Unnullify a)
41 -> TypeInformation [a]
40 -> TypeInformation [a]
42−listTypeInformation nullity info@TypeInformation {encode, decode} =
41+listTypeInformation nullability info =
43− TypeInformation
42+ case info of
44− { decode = case nullity of
43+ TypeInformation{ encode, decode, out } -> TypeInformation
45− Null ->
44+ { decode = row $ case nullability of
46− Hasql.listArray (decodeArrayElement info (Hasql.nullable decode))
45+ Nullable -> Hasql.listArray (Hasql.nullable (out <$> decode))
47− NotNull ->
46+ NonNullable -> Hasql.listArray (Hasql.nonNullable (out <$> decode))
48− Hasql.listArray (decodeArrayElement info (Hasql.nonNullable decode))
47+ , encode = case nullability of
49− , encode = case nullity of
48+ Nullable -> array info . fmap (maybe null encode)
50− Null ->
49+ NonNullable -> array info . fmap encode
51− Opaleye.ArrayExpr .
50+ , typeName = "record"
52− fmap (encodeArrayElement info . maybe null encode)
51+ , out = id
53− NotNull ->
52+ }
54− Opaleye.ArrayExpr .
55− fmap (encodeArrayElement info . encode)
56− , typeName = arrayType info <> "[]"
57− }
58 where
53 where
54+ row = Hasql.composite . Hasql.field . Hasql.nonNullable
59 null = Opaleye.ConstExpr Opaleye.NullLit
55 null = Opaleye.ConstExpr Opaleye.NullLit
60
56
61
57
62nonEmptyTypeInformation :: ()
58nonEmptyTypeInformation :: ()
63− => Nullity a
59+ => Nullability a
64 -> TypeInformation (Unnullify a)
60 -> TypeInformation (Unnullify a)
65 -> TypeInformation (NonEmpty a)
61 -> TypeInformation (NonEmpty a)
66−nonEmptyTypeInformation nullity =
62+nonEmptyTypeInformation nullability =
67− parseTypeInformation parse toList . listTypeInformation nullity
63+ parseTypeInformation parse toList . listTypeInformation nullability
68 where
64 where
69 parse = maybe (Left message) Right . nonEmpty
65 parse = maybe (Left message) Right . nonEmpty
70 message = "failed to decode NonEmptyList: got empty list"
66 message = "failed to decode NonEmptyList: got empty list"
71
67
72
68
73−isArray :: TypeInformation a -> Bool
69+fromPrimArray :: Opaleye.PrimExpr -> Opaleye.PrimExpr
74−isArray = \case
70+fromPrimArray = Opaleye.UnExpr (Opaleye.UnOpOther "ROW")
75− (reverse . typeName -> ']' : '[' : _) -> True
76− _ -> False
77
71
78
72
79−arrayType :: TypeInformation a -> String
73+toPrimArray :: Opaleye.PrimExpr -> Opaleye.PrimExpr
80−arrayType info
74+toPrimArray a = Opaleye.CompositeExpr a "f1"
81− | isArray info = "record"
82− | otherwise = typeName info
83
75
84
76
85−decodeArrayElement :: TypeInformation a -> Hasql.NullableOrNot Hasql.Value x -> Hasql.NullableOrNot Hasql.Value x
77+zipPrimArraysWith :: ()
86−decodeArrayElement info
78+ => (Opaleye.PrimExpr -> Opaleye.PrimExpr -> Opaleye.PrimExpr)
87− | isArray info = Hasql.nonNullable . Hasql.composite . Hasql.field
79+ -> Opaleye.PrimExpr -> Opaleye.PrimExpr -> Opaleye.PrimExpr
88− | otherwise = id
80+zipPrimArraysWith f a b = fromPrimArray (f (toPrimArray a) (toPrimArray b))
89−
90−
91−encodeArrayElement :: TypeInformation a -> Opaleye.PrimExpr -> Opaleye.PrimExpr
92−encodeArrayElement info
93− | isArray info = Opaleye.UnExpr (Opaleye.UnOpOther "ROW")
94− | otherwise = id
95−
96−
97−extractArrayElement :: TypeInformation a -> Opaleye.PrimExpr -> Opaleye.PrimExpr
98−extractArrayElement info
99− | isArray info = flip Opaleye.CompositeExpr "f1"
100− | otherwise = id
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