dev..c25657e · squeal · git.iko.soy

git.iko.soy/squeal

52 files changed+5402−8618

unifiedsplit

.circleci/config.yml+1−1

@@ -2,7 +2,7 @@ version: 2

22jobs:

33 build:

44 docker:

5− - image: haskell:8.6.5

5+ - image: haskell:8.6.3

66 - image: circleci/postgres:latest

77 environment:

88 POSTGRES_USER: root

README.md+75−64

@@ -46,11 +46,7 @@ composable and cover a large portion of SQL.

4646* transactions

4747* views

4848* array, composite and enumerated types

49−* json functions and operations

50−* multischema support

51−* correlated subqueries

52−* window functions

53−* text search

49+* json operations

5450

5551## installation

5652

@@ -76,17 +72,19 @@ First, we need some language extensions because Squeal uses modern GHC

7672features.

7773

7874```Haskell

79−>>> :set -XDataKinds -XDeriveGeneric -XOverloadedLabels -XFlexibleContexts

80−>>> :set -XOverloadedStrings -XTypeApplications -XTypeOperators -XGADTs

75+>>> :set -XDataKinds -XDeriveGeneric -XOverloadedLabels

76+>>> :set -XOverloadedStrings -XTypeApplications -XTypeOperators

8177```

8278

8379We'll need some imports.

8480

8581```Haskell

86−>>> import Control.Monad.IO.Class (liftIO)

82+>>> import Control.Monad (void)

83+>>> import Control.Monad.Base (liftBase)

8784>>> import Data.Int (Int32)

8885>>> import Data.Text (Text)

8986>>> import Squeal.PostgreSQL

87+>>> import Squeal.PostgreSQL.Render

9088```

9189

9290We'll use generics to easily convert between Haskell and PostgreSQL values.

@@ -101,27 +99,27 @@ we use `DataKinds` and `TypeOperators`.

10199

102100```Haskell

103101>>> :{

104−type UsersColumns =

105− '[ "id" ::: 'Def :=> 'NotNull 'PGint4

106− , "name" ::: 'NoDef :=> 'NotNull 'PGtext ]

107−type UsersConstraints = '[ "pk_users" ::: 'PrimaryKey '["id"] ]

108−type EmailsColumns =

109− '[ "id" ::: 'Def :=> 'NotNull 'PGint4

110− , "user_id" ::: 'NoDef :=> 'NotNull 'PGint4

111− , "email" ::: 'NoDef :=> 'Null 'PGtext ]

112−type EmailsConstraints =

113− '[ "pk_emails" ::: 'PrimaryKey '["id"]

114− , "fk_user_id" ::: 'ForeignKey '["user_id"] "users" '["id"] ]

115102type Schema =

116− '[ "users" ::: 'Table (UsersConstraints :=> UsersColumns)

117− , "emails" ::: 'Table (EmailsConstraints :=> EmailsColumns) ]

118−type Schemas = Public Schema

103+ '[ "users" ::: 'Table (

104+ '[ "pk_users" ::: 'PrimaryKey '["id"] ] :=>

105+ '[ "id" ::: 'Def :=> 'NotNull 'PGint4

106+ , "name" ::: 'NoDef :=> 'NotNull 'PGtext

107+ ])

108+ , "emails" ::: 'Table (

109+ '[ "pk_emails" ::: 'PrimaryKey '["id"]

110+ , "fk_user_id" ::: 'ForeignKey '["user_id"] "users" '["id"]

111+ ] :=>

112+ '[ "id" ::: 'Def :=> 'NotNull 'PGint4

113+ , "user_id" ::: 'NoDef :=> 'NotNull 'PGint4

114+ , "email" ::: 'NoDef :=> 'Null 'PGtext

115+ ])

116+ ]

119117:}

120118```

121119

122120Notice the use of type operators.

123121

124−`:::` is used to pair an alias `Symbol` with a `SchemumType`,

122+`:::` is used to pair an alias `GHC.TypeLits.Symbol` with a `SchemumType`,

125123a `TableConstraint` or a `ColumnType`. It is intended to connote Haskell's `::`

126124operator.

127125

@@ -130,7 +128,7 @@ yielding a `TableType`, or to pair a `ColumnConstraint` with a `NullityType`,

130128yielding a `ColumnType`. It is intended to connote Haskell's `=>` operator

131129

132130Next, we'll write `Definition`s to set up and tear down the schema. In

133−Squeal, a `Definition` like `createTable`, `alterTable` or `dropTable`

131+Squeal, a `Definition` like `createTable`, `alterTable` or `dropTable`

134132has two type parameters, corresponding to the schema

135133before being run and the schema after. We can compose definitions using `>>>`.

136134Here and in the rest of our commands we make use of overloaded

@@ -139,8 +137,8 @@ labels to refer to named tables and columns in our schema.

139137```Haskell

140138>>> :{

141139let

142− setup :: Definition (Public '[]) Schemas

143− setup =

140+ setup :: Definition '[] Schema

141+ setup =

144142 createTable #users

145143 ( serial `as` #id :*

146144 (text & notNullable) `as` #name )

@@ -171,7 +169,7 @@ primary and foreign keys, making them somewhat complex. Our `teardown`

171169```Haskell

172170>>> :{

173171let

174− teardown :: Definition Schemas (Public '[])

172+ teardown :: Definition Schema '[]

175173 teardown = dropTable #emails >>> dropTable #users

176174:}

177175

@@ -180,54 +178,54 @@ DROP TABLE "emails";

180178DROP TABLE "users";

181179```

182180

183−We'll need a Haskell type for `User`s. We give the type `SOP.Generic` and

184−`SOP.HasDatatypeInfo` instances so that we can encode and decode `User`s.

185−

186−```Haskell

187−>>> data User = User { userName :: Text, userEmail :: Maybe Text } deriving (Show, GHC.Generic)

188−>>> instance SOP.Generic User

189−>>> instance SOP.HasDatatypeInfo User

190−```

191−

192−Next, we'll write `Manipulation_`s to insert `User`s into our two tables.

193−A `Manipulation_` like `insertInto`, `update` or `deleteFrom`

194−has three type parameters, the schemas it refers to, input parameters

195−and an output row. When

181+Next, we'll write `Manipulation`s to insert data into our two tables.

182+A `Manipulation` like `insertRow`, `update` or `deleteFrom`

183+has three type parameters, the schema it refers to, a list of parameters

184+it can take as input, and a list of columns it produces as output. When

196185we insert into the users table, we will need a parameter for the `name`

197186field but not for the `id` field. Since it's serial, we can use a default

198187value. However, since the emails table refers to the users table, we will

199188need to retrieve the user id that the insert generates and insert it into

200−the emails table. We can do this in a single `Manipulation_` by using a

201−`with` statement.

189+the emails table. Take a careful look at the type and definition of both

190+of our inserts.

202191

203192```Haskell

204193>>> :{

205194let

206− insertUser :: Manipulation_ Schemas User ()

207− insertUser = with (u `as` #u) e

208− where

209− u = insertInto #users

210− (Values_ (Default `as` #id :* Set (param @1) `as` #name))

211− OnConflictDoRaise (Returning_ (#id :* param @2 `as` #email))

212− e = insertInto_ #emails $ Select

213− (Default `as` #id :* Set (#u ! #id) `as` #user_id :* Set (#u ! #email) `as` #email)

214− (from (common #u))

195+ insertUser :: Manipulation Schema '[ 'NotNull 'PGtext ] '[ "fromOnly" ::: 'NotNull 'PGint4 ]

196+ insertUser = insertRow #users

197+ (Default `as` #id :* Set (param @1) `as` #name)

198+ OnConflictDoNothing (Returning (#id `as` #fromOnly))

199+:}

200+

201+>>> :{

202+let

203+ insertEmail :: Manipulation Schema '[ 'NotNull 'PGint4, 'Null 'PGtext] '[]

204+ insertEmail = insertRow #emails

205+ ( Default `as` #id :*

206+ Set (param @1) `as` #user_id :*

207+ Set (param @2) `as` #email )

208+ OnConflictDoNothing (Returning Nil)

215209:}

216210

217211>>> printSQL insertUser

218−WITH "u" AS (INSERT INTO "users" ("id", "name") VALUES (DEFAULT, ($1 :: text)) RETURNING "id" AS "id", ($2 :: text) AS "email") INSERT INTO "emails" ("user_id", "email") SELECT "u"."id", "u"."email" FROM "u" AS "u"

212+INSERT INTO "users" ("id", "name") VALUES (DEFAULT, ($1 :: text)) ON CONFLICT DO NOTHING RETURNING "id" AS "fromOnly"

213+>>> printSQL insertEmail

214+INSERT INTO "emails" ("id", "user_id", "email") VALUES (DEFAULT, ($1 :: int4), ($2 :: text)) ON CONFLICT DO NOTHING

219215```

220216

221−Next we write a `Query_` to retrieve users from the database. We're not

217+Next we write a `Query` to retrieve users from the database. We're not

222218interested in the ids here, just the usernames and email addresses. We

223−need to use an `innerJoin` to get the right result. A `Query_` is like a

224−`Manipulation_` with the same kind of type parameters.

219+need to use an inner join to get the right result. A `Query` is like a

220+`Manipulation` with the same kind of type parameters.

225221

226222```Haskell

227223>>> :{

228224let

229− getUsers :: Query_ Schemas () User

230− getUsers = select_

225+ getUsers :: Query Schema '[]

226+ '[ "userName" ::: 'NotNull 'PGtext

227+ , "userEmail" ::: 'Null 'PGtext ]

228+ getUsers = select

231229 (#u ! #name `as` #userName :* #e ! #email `as` #userEmail)

232230 ( from (table (#users `as` #u)

233231 & innerJoin (table (#emails `as` #e))

@@ -238,13 +236,25 @@ let

238236SELECT "u"."name" AS "userName", "e"."email" AS "userEmail" FROM "users" AS "u" INNER JOIN "emails" AS "e" ON ("u"."id" = "e"."user_id")

239237```

240238

241−Let's create some users to add to the database.

239+Now that we've defined the SQL side of things, we'll need a Haskell type

240+for users. We give the type `Generics.SOP.Generic` and

241+`Generics.SOP.HasDatatypeInfo` instances so that we can decode the rows

242+we receive when we run `getUsers`. Notice that the record fields of the

243+`User` type match the column names of `getUsers`.

244+

245+```Haskell

246+>>> data User = User { userName :: Text, userEmail :: Maybe Text } deriving (Show, GHC.Generic)

247+>>> instance SOP.Generic User

248+>>> instance SOP.HasDatatypeInfo User

249+```

250+

251+Let's also create some users to add to the database.

242252

243253```Haskell

244254>>> :{

245255let

246256 users :: [User]

247− users =

257+ users =

248258 [ User "Alice" (Just "alice@gmail.com")

249259 , User "Bob" Nothing

250260 , User "Carole" (Just "carole@hotmail.com")

@@ -263,18 +273,19 @@ transformer and when the schema doesn't change we can use `Monad` and

263273```Haskell

264274>>> :{

265275let

266− session :: PQ Schemas Schemas IO ()

276+ session :: PQ Schema Schema IO ()

267277 session = do

268− _ <- traversePrepared_ insertUser users

278+ idResults <- traversePrepared insertUser (Only . userName <$> users)

279+ ids <- traverse (fmap fromOnly . getRow 0) idResults

280+ traversePrepared_ insertEmail (zip (ids :: [Int32]) (userEmail <$> users))

269281 usersResult <- runQuery getUsers

270282 usersRows <- getRows usersResult

271− liftIO $ print (usersRows :: [User])

283+ liftBase $ print (usersRows :: [User])

272284in

273− withConnection "host=localhost port=5432 dbname=exampledb" $

285+ void . withConnection "host=localhost port=5432 dbname=exampledb" $

274286 define setup

275287 & pqThen session

276288 & pqThen (define teardown)

277289:}

278290[User {userName = "Alice", userEmail = Just "alice@gmail.com"},User {userName = "Bob", userEmail = Nothing},User {userName = "Carole", userEmail = Just "carole@hotmail.com"}]

279−-}

280291```

RELEASE NOTES.md−400

@@ -1,405 +1,5 @@

11## RELEASE NOTES

3−### Version 0.5

4−

5−Version 0.5 makes a number of large changes and additions to Squeal.

6−I want to thank folks who contributed issues and pull requests;

7−Raveline, rimmington, ilyakooo0, chshersh, reygoch, and more.

8−

9−**Multi-schema support**

10−

11−Previous versions of Squeal only supported definitions in the "public"

12−schema. Squeal 0.5 adds support for multiple schemas with the new kind

13−

14−```Haskell

15−type SchemasType = [(Symbol,SchemaType)]

16−```

17−

18−In order to upgrade your queries, manipulations and definitions from

19−Squeal 0.4, you will have to apply the `Public` type family, which indicates

20−that your only schema is the "public" schema.

21−

22−```Haskell

23−-- Squeal 0.4

24−setup :: Definition '[] Schema

25−

26−-- Squeal 0.5

27−setup :: Definition (Public '[]) (Public Schema)

28−```

29−

30−You can create non-public schemas using `createSchema` and inversely

31−remove them using `dropSchema`. There is also an idempotent

32−`createSchemaIfNotExists`.

33−

34−In order to handle aliases which may refer to non-public schemas, Squeal 0.5

35−introduces `QualifiedAlias`es. A `QualifiedAlias` can be referred to using

36−the `(!)` operator from the `IsQualified` typeclass; but if you want to refer

37−to an alias from the "public" schema, you can continue to use a single

38−overloaded label, no need to write `#public ! #tab`, just write `#tab`.

39−

40−**Top-level statements**

41−

42−As a consequence of multi-schema support, common table expressions that

43−a `Query` or `Manipulation` may refer to had to be broken into a new parameter.

44−Additionally, `Query` gained another new parameter for its outer scope which

45−will be discussed in the next section.

46−

47−To simplify type signatures that you have to write for top-level queries

48−and manipulations, Squeal 0.5 introduces the `Query_` and `Manipulation_`

49−type families.

50−

51−```

52−type family Query_

53− (schemas :: SchemasType)

54− (parameters :: Type)

55− (row :: Type) where

56− Query_ schemas params row =

57− Query '[] '[] schemas (TuplePG params) (RowPG row)

58−```

59−

60−As you see, a top-level `Query_` has no outer scope and no common

61−table expressions in scope, they are empty `'[]`. Moreover,

62−its parameters and row parameters are now `Type`s, which are

63−converted to corresponding Postgres types using the `TuplePG`

64−and `RowPG` type families. This means you can write the type signatures

65−for your top-level statements using the Haskell types that you

66−intend to input and retrieve when running the statements. Similar

67−to `Query_`, there is a `Manipulation_` type, the only difference

68−being that a general `Manipulation` doesn't have an outer scope,

69−only a scope for common table expressions.

70−

71−**Subquery expressions**

72−

73−Previous versions of Squeal offered subquery expression support

74−but there were issues. The common use case of using the `IN` operator

75−from SQL was overly complex. There was a proliferation of subquery

76−functions to handle different comparison operators, each with two versions

77−for comparing `ALL` or `ANY` of the query rows. And, most confoundedly,

78−there was no way to support the `EXISTS` subquery because the "outer scope"

79−for a query was not available.

80−

81−Squeal adds an outer scope to the `Query` type.

82−

83−```Haskell

84−newtype Query

85− (outer :: FromType)

86− (commons :: FromType)

87− (schemas :: SchemasType)

88− (params :: [NullityType])

89− (row :: RowType)

90− = UnsafeQuery { renderQuery :: ByteString }

91−```

92−

93−This enables a well-typed `exists` function.

94−

95−```Haskell

96−exists

97− :: Query (Join outer from) commons schemas params row

98− -> Condition outer commons grp schemas params from

99−```

100−

101−The `in_` and `notIn` functions were simplified to handle the most

102−common use case of comparing to a list of values.

103−

104−```Haskell

105−in_

106− :: Expression outer commons grp schemas params from ty -- ^ expression

107− -> [Expression outer commons grp schemas params from ty]

108− -> Condition outer commons grp schemas params from

109−```

110−

111−Finally, general subquery comparisons were abstracted to work with

112−any comparison operators, using the `Operator` type which will be discussed in

113−the next section.

114−

115−```Haskell

116−subAll

117− :: Expression outer commons grp schemas params from ty1

118− -> Operator ty1 ty2 ('Null 'PGbool)

119− -> Query (Join outer from) commons schemas params '[col ::: ty2]

120− -> Condition outer commons grp schemas params from

121−

122−subAny

123− :: Expression outer commons grp schemas params from ty1

124− -> Operator ty1 ty2 ('Null 'PGbool)

125− -> Query (Join outer from) commons schemas params '[col ::: ty2]

126− -> Condition outer commons grp schemas params from

127−```

128−

129−**Expression RankNTypes**

130−

131−Squeal 0.5 introduces RankNType type synonyms for common expression patterns.

132−The simplest example is the `Expr` type, a type for "closed" expressions

133−that cannot reference any aliases or parameters.

134−

135−```Haskell

136−type Expr x

137− = forall outer commons grp schemas params from

138− . Expression outer commons grp schemas params from x

139−```

140−

141−There is also a function type `(-->)`, which is a subtype of the usual Haskell function

142−type `(->)`.

143−

144−```Haskell

145−type (-->) x y

146− = forall outer commons grp schemas params from

147− . Expression outer commons grp schemas params from x

148− -> Expression outer commons grp schemas params from y

149−```

150−

151−We saw in the subquery section that there is an `Operator` type.

152−

153−```Haskell

154−type Operator x1 x2 y

155− = forall outer commons grp schemas params from

156− . Expression outer commons grp schemas params from x1

157− -> Expression outer commons grp schemas params from x2

158− -> Expression outer commons grp schemas params from y

159−```

160−

161−There are also types `FunctionN` and `FunctionVar` for n-ary functions

162−and variadic functions.

163−

164−```

165−type FunctionN xs y

166− = forall outer commons grp schemas params from

167− . NP (Expression outer commons grp schemas params from) xs

168− -> Expression outer commons grp schemas params from y

169−```

170−

171−An n-ary function takes an `NP` list of `Expression`s as its argument.

172−Squeal 0.5 adds a helpful operator `(*:)`, to help scrap your `Nil`s.

173−You can construct an `NP` list now by using the operator `(:*)`,

174−until your last element, using `(*:)` there. For instance, the function

175−`atan2_` takes two arguments, `atan2_ (pi *: 2)`.

176−

177−**Selections**

178−

179−Previously, Squeal provided a couple versions of `SELECT` depending

180−on whether you wanted to select all columns of a unique table

181−in the from clause, i.e. `*`, all columns of a particular table

182−in the from clause, i.e. `.*`, or a list of columns from the from clause.

183−

184−Squeal 0.5 refactors this pattern into a `Selection` GADT type, allowing

185−for abstraction and combinations that were not possible before.

186−

187−```Haskell

188−data Selection outer commons grp schemas params from row where

189− Star

190− :: HasUnique tab from row

191− => Selection outer commons 'Ungrouped schemas params from row

192− DotStar

193− :: Has tab from row

194− => Alias tab

195− -> Selection outer commons 'Ungrouped schemas params from row

196− List

197− :: SListI row

198− => NP (Aliased (Expression outer commons grp schemas params from)) row

199− -> Selection outer commons grp schemas params from row

200− Over

201− :: SListI row

202− => NP (Aliased (WindowFunction outer commons grp schemas params from)) row

203− -> WindowDefinition outer commons grp schemas params from

204− -> Selection outer commons grp schemas params from row

205− Also

206− :: Selection outer commons grp schemas params from right

207− -> Selection outer commons grp schemas params from left

208− -> Selection outer commons grp schemas params from (Join left right)

209−```

210−

211−In addition to the `Star`, `DotStar` and `List` constructors, there is an

212−`Also` constructor combinator, which enables users to combine `Selection`s.

213−Additionally, there is an `Over` constructor that is used to enable

214−window functions, described in the next section.

215−

216−To upgrade from Squeal 0.4, you will replace `selectStar` with `select Star`,

217−replace `selectDotStar #tab` with `select (DotStar #tab)`. The `List`

218−selection is such a common use case that there is a function `select_` which

219−automatically applies it, so to upgrade from Squeal 0.4, replace `select`

220−with `select_`. There are also independent `selectDistinct` and `selectDistinct_`

221−functions to filter out duplicate rows.

222−

223−**Query clauses**

224−

225−Previously, Squeal provided a couple versions of `INSERT` depending

226−on whether you wanted to insert `VALUES` or a query.

227−

228−Squeal 0.5 refactors this pattern into a `QueryClause` GADT.

229−

230−```

231−-- Squeal 0.4

232−insertRow_ #tab (Set 2 `as` #col1 :* Default `as` #col2)

233−insertQuery_ #tab (selectStar (from (table #other_tab)))

234−

235−-- Squeal 0.5

236−insertInto_ #tab (Values_ (Set 2 `as` #col1 :* Default `as` #col2))

237−insertInto_ #tab (Subquery (select Star (from (table #other_tab))))

238−```

239−

240−**Window functions and aggregation**

241−

242−Previous versions of Squeal provided no support for window functions.

243−Squeal 0.5 adds support for window functions. We saw `Over` in the

244−previous section.

245−

246−```Haskell

247−Over

248− :: SListI row

249− => NP (Aliased (WindowFunction outer commons grp schemas params from)) row

250− -> WindowDefinition outer commons grp schemas params from

251− -> Selection outer commons grp schemas params from row

252−```

253−

254−`Over` combines window functions with window definitions. A `WindowDefinition`

255−is constructed using the `partitionBy` function, optionally with an `orderBy`

256−clause. For example,

257−

258−```Haskell

259−query :: Query_ (Public Schema) () (Row Int32 Int32)

260−query = select

261− (#col1 & Also (rank `as` #col2 `Over` (partitionBy #col1 & orderBy [#col2 & Asc])))

262− (from (table #tab))

263−```

264−

265−Here the `rank` function is a `WindowFunction`

266−

267−```Haskell

268−rank :: WinFun0 ('NotNull 'PGint8)

269−rank = UnsafeWindowFunction "rank()"

270−```

271−

272−`WinFun0` is a RankNType, like `Expr` was, used for no argument window functions.

273−Similarly, there are also `WinFun1` and `WinFunN` types for

274−window functions and n-ary window functions.

275−

276−In order to use the same syntax for certain window functions and aggregate functions,

277−a new typeclass `Aggregate` was introduced. So for instance, `sum_` can be

278−either a `Distinction` `Expression` or a `WindowFunction`, used either with

279−a `groupBy` or with a `partitionBy` in the appropriate way.

280−

281−```

282−data Distinction (expr :: kind -> Type) (ty :: kind)

283− = All (expr ty)

284− | Distinct (expr ty)

285−```

286−

287−Aggregate functions can be run over all rows or only over distinct rows,

288−while window functions bear no such distinction.

289−

290−**Migrations**

291−

292−Thanks to [https://github.com/Raveline](Raveline) Squeal 0.5 introduces

293−a function `defaultMain` to easily create a command line program to

294−run or rewind your migrations.

295−

296−Previously, Squeal's migrations were impure, allowing in addition to

297−running `Definition`s to run arbitrary `IO` operations, such as inserting

298−data into the database or printing out status messages. In order to

299−provide compatibility with other migration systems, Squeal 0.5 introduces

300−pure migrations, that is migrations that are only `Definition`s.

301−

302−```Haskell

303−data Migration p schemas0 schemas1 = Migration

304− { name :: Text -- ^ The `name` of a `Migration`.

305− -- Each `name` in a `Migration` should be unique.

306− , up :: p schemas0 schemas1 -- ^ The `up` instruction of a `Migration`.

307− , down :: p schemas1 schemas0 -- ^ The `down` instruction of a `Migration`.

308− } deriving (GHC.Generic)

309−```

310−

311−A pure migration is a `Migration Definition`, a pair of inverse

312−`Definition`s with a unique name. To recover impure migrations, Squeal 0.5

313−introduces the `Terminally` type.

314−

315−```Haskell

316−newtype Terminally trans monad x0 x1 = Terminally

317− { runTerminally :: trans x0 x1 monad () }

318−```

319−

320−`Terminally` applies the indexed monad transformer and the monad it transforms

321−to the unit type `()`, thereby turning an indexed monad into a `Category`. An

322−impure migration is a `Migration (Terminally PQ IO)`. You can always cast

323−a pure migration into an impure migration with the functor, `pureMigration`.

324−

325−```Haskell

326−pureMigration

327− :: Migration Definition schemas0 schemas1

328− -> Migration (Terminally PQ IO) schemas0 schemas1

329−```

330−

331−To run either pure or impure migrations, Squeal 0.5 introduces

332−a typeclass, `Migratory`.

333−

334−```

335−class Category p => Migratory p where

336−

337− migrateUp

338− :: AlignedList (Migration p) schemas0 schemas1

339− -> PQ schemas0 schemas1 IO ()

340−

341− migrateDown

342− :: AlignedList (Migration p) schemas0 schemas1

343− -> PQ schemas1 schemas0 IO ()

344−```

345−

346−The signatures of `migrateUp` and `migrateDown` have been changed

347−to make them easier to compose with other `PQ` actions.

348−

349−**Transactions**

350−

351−You can now run transactions `ephemerally`, guaranteed to roll back,

352−but return the result or throw the exception that the transaction

353−would have generated. This is useful for testing. You can also

354−`transactionallyRetry` computations, retrying the transaction if

355−a [serialization failure](https://www.postgresql.org/docs/11/transaction-iso.html#XACT-REPEATABLE-READ) occurs.

356−

357−**Types**

358−

359−Squeal now supports money via a `Money` Haskell `Type` and a `'PGmoney`

360−`PGType`. Squeal 0.5 also adds support for creating domain types

361−with `createDomain`.

362−

363−**Time**

364−

365−Squeal 0.5 adds support for new functions; `now`, `makeDate`, `makeTime`,

366−, `makeTimestamp`, and `makeTimestamptz`, a function `interval_` for

367−constructing time intervals out multiples of `TimeUnit`s, and a new

368−`TimeOp` class, defining affine space operators for time types and their

369−differences.

370−

371−**Literals**

372−

373−Squeal allows you to include Haskell values in your statements using

374−out of line `parameter`s, but often you want to include them inline,

375−as a SQL `literal`. Squeal 0.5 enables this using the `Literal` class.

376−

377−**Set returning functions**

378−

379−Squeal 0.5 adds support for set returning functions such as `unnest`,

380−with the `RankNType` `SetOfFunction`, which can be used as as a `FromClause`.

381−

382−**Text search**

383−

384−Squeal 0.5 adds extensive support for text search types, functions and operators.

385−

386−**Much more**

387−

388−Lots more changes went into and under the hood of the new version.

389−The `Expression` module was split into coherent submodules since it

390−had grown to immense proportions. New modules `Alias`, `PG` and `List`

391−were added to relieve some of the burden that the `Schema` module

392−had been carrying. Rendering has been better unified with a new

393−`RenderSQL` typeclass. Type level list concatenation with the `Additional`

394−typeclass has been added. `Manipulation`s `update` and `delete`

395−were upgraded, so you can leave out fields you don't want to update and

396−use `USING` clauses in deletes. Upserts which were previously broken

397−now work. The `IO` typeclass hierarchy was changed from `MonadBase`

398−and `MonadBaseControl` to `MonadIO` and `MonadUnliftIO`. A new

399−`withRecursive` `Manipulation` was added. `SquealException`s were

400−refactored and a `trySqueal` function added. Arrays were refactored.

401−And there was probably more I've forgotten.

402−

4033### Version 0.4

4044

4055Version 0.4 strengthens Squeal's type system, adds

squeal-postgresql/exe/Example.hs+13−15

@@ -11,7 +11,8 @@

1111

1212module Main (main, main2) where

1313

14−import Control.Monad.IO.Class (MonadIO (..))

14+import Control.Monad (void)

15+import Control.Monad.Base (liftBase, MonadBase)

1516import Data.Int (Int16, Int32)

1617import Data.Monoid ((<>))

1718import Data.Text (Text)

@@ -38,7 +39,6 @@ type Schema =

3839 , "user_id" ::: 'NoDef :=> 'NotNull 'PGint4

3940 , "email" ::: 'NoDef :=> 'Null 'PGtext

4041 ])

41− , "positive" ::: 'Typedef 'PGfloat4

4242 ]

4343

4444type Schemas = Public Schema

@@ -53,25 +53,23 @@ setup =

5353 >>>

5454 createTable #emails

5555 ( serial `as` #id :*

56− hask @Int32 `as` #user_id :*

57− hask @(Maybe Text) `as` #email )

56+ (int & notNullable) `as` #user_id :*

57+ (text & nullable) `as` #email )

5858 ( primaryKey #id `as` #pk_emails :*

5959 foreignKey #user_id #users #id

6060 OnDeleteCascade OnUpdateCascade `as` #fk_user_id )

61− >>>

62− createDomain #positive real (#value .> 0 .&& (#value & isNotNull))

6361

6462teardown :: Definition Schemas (Public '[])

65−teardown = dropType #positive >>> dropTable #emails >>> dropTable #users

63+teardown = dropTable #emails >>> dropTable #users

6664

6765insertUser :: Manipulation_ Schemas (Text, VarArray (Vector (Maybe Int16))) (Only Int32)

6866insertUser = insertInto #users

69− (Values_ (Default `as` #id :* Set (param @1) `as` #name :* Set (param @2) `as` #vec))

67+ (Values_ (defaultAs #id :* param @1 `as` #name :* param @2 `as` #vec))

7068 (OnConflict (OnConstraint #pk_users) DoNothing) (Returning_ (#id `as` #fromOnly))

7169

7270insertEmail :: Manipulation_ Schemas (Int32, Maybe Text) ()

7371insertEmail = insertInto_ #emails

74− (Values_ (Default `as` #id :* Set (param @1) `as` #user_id :* Set (param @2) `as` #email))

72+ (Values_ (defaultAs #id :* param @1 `as` #user_id :* param @2 `as` #email))

7573

7674getUsers :: Query_ Schemas () User

7775getUsers = select_

@@ -86,22 +84,22 @@ instance SOP.Generic User

8684instance SOP.HasDatatypeInfo User

8785

8886users :: [User]

89−users =

87+users =

9088 [ User "Alice" (Just "alice@gmail.com") (VarArray [Nothing, Just 1])

9189 , User "Bob" Nothing (VarArray [Just 2, Nothing])

9290 , User "Carole" (Just "carole@hotmail.com") (VarArray [Just 3])

9391 ]

9492

95−session :: (MonadIO pq, MonadPQ Schemas pq) => pq ()

93+session :: (MonadBase IO pq, MonadPQ Schemas pq) => pq ()

9694session = do

97− liftIO $ Char8.putStrLn "manipulating"

95+ liftBase $ Char8.putStrLn "manipulating"

9896 idResults <- traversePrepared insertUser ([(userName user, userVec user) | user <- users])

9997 ids <- traverse (fmap fromOnly . getRow 0) idResults

10098 traversePrepared_ insertEmail (zip (ids :: [Int32]) (userEmail <$> users))

101− liftIO $ Char8.putStrLn "querying"

99+ liftBase $ Char8.putStrLn "querying"

102100 usersResult <- runQuery getUsers

103101 usersRows <- getRows usersResult

104− liftIO $ print (usersRows :: [User])

102+ liftBase $ print (usersRows :: [User])

105103

106104main :: IO ()

107105main = do

@@ -119,7 +117,7 @@ main = do

119117

120118main2 :: IO ()

121119main2 =

122− withConnection "host=localhost port=5432 dbname=exampledb" $

120+ void . withConnection "host=localhost port=5432 dbname=exampledb" $

123121 define setup

124122 & pqThen session

125123 & pqThen (define teardown)

squeal-postgresql/squeal-postgresql.cabal+16−58

@@ -1,5 +1,5 @@

11name: squeal-postgresql

2−version: 0.5.1.0

2+version: 0.4.9.0

33synopsis: Squeal PostgreSQL Library

44description: Squeal is a type-safe embedding of PostgreSQL in Haskell

55homepage: https://github.com/morphismtech/squeal

@@ -22,40 +22,12 @@ library

2222 hs-source-dirs: src

2323 exposed-modules:

2424 Squeal.PostgreSQL

25− Squeal.PostgreSQL.Alias

2625 Squeal.PostgreSQL.Binary

2726 Squeal.PostgreSQL.Definition

28− Squeal.PostgreSQL.Definition.Function

29− Squeal.PostgreSQL.Definition.Index

30− Squeal.PostgreSQL.Definition.Table

31− Squeal.PostgreSQL.Definition.Table.Constraint

32− Squeal.PostgreSQL.Definition.Type

33− Squeal.PostgreSQL.Definition.Schema

34− Squeal.PostgreSQL.Definition.View

3527 Squeal.PostgreSQL.Expression

36− Squeal.PostgreSQL.Expression.Aggregate

37− Squeal.PostgreSQL.Expression.Collection

38− Squeal.PostgreSQL.Expression.Comparison

39− Squeal.PostgreSQL.Expression.Json

40− Squeal.PostgreSQL.Expression.Literal

41− Squeal.PostgreSQL.Expression.Logic

42− Squeal.PostgreSQL.Expression.Math

43− Squeal.PostgreSQL.Expression.Null

44− Squeal.PostgreSQL.Expression.Parameter

45− Squeal.PostgreSQL.Expression.Range

46− Squeal.PostgreSQL.Expression.Set

47− Squeal.PostgreSQL.Expression.Sort

48− Squeal.PostgreSQL.Expression.Subquery

49− Squeal.PostgreSQL.Expression.Text

50− Squeal.PostgreSQL.Expression.TextSearch

51− Squeal.PostgreSQL.Expression.Time

52− Squeal.PostgreSQL.Expression.Type

53− Squeal.PostgreSQL.Expression.Window

54− Squeal.PostgreSQL.List

5528 Squeal.PostgreSQL.Manipulation

5629 Squeal.PostgreSQL.Migration

5730 Squeal.PostgreSQL.Pool

58− Squeal.PostgreSQL.PG

5931 Squeal.PostgreSQL.PQ

6032 Squeal.PostgreSQL.Render

6133 Squeal.PostgreSQL.Query

@@ -70,9 +42,10 @@ library

7042 , bytestring >= 0.10.8.2

7143 , bytestring-strict-builder >= 0.4.5

7244 , deepseq >= 1.4.3.0

73− , free-categories >= 0.1.0.0

74− , generics-sop >= 0.3.2.0 && < 0.5.0.0

45+ , generics-sop >= 0.3.2.0

46+ , lifted-base >= 0.2.3.12

7547 , mmorph >= 1.1.1

48+ , monad-control >= 1.0.2.3

7649 , mtl >= 2.2.2

7750 , network-ip >= 0.3.0.2

7851 , postgresql-binary >= 0.12.1

@@ -83,55 +56,39 @@ library

8356 , text >= 1.2.3.0

8457 , time >= 1.8.0.2

8558 , transformers >= 0.5.2.0

86− , unliftio >= 0.2.10

87− , unliftio-pool >= 0.2.1.0

59+ , transformers-base >= 0.4.4

8860 , uuid-types >= 1.0.3

8961 , vector >= 0.12.0.1

9062

91−test-suite doctest

63+test-suite squeal-postgresql-doctest

9264 default-language: Haskell2010

9365 type: exitcode-stdio-1.0

9466 hs-source-dirs: test

9567 ghc-options: -Wall

96− main-is: Doc.hs

68+ main-is: DocTest.hs

9769 build-depends:

9870 base >= 4.10.0.0

9971 , doctest >= 0.11.4

100− , squeal-postgresql

10172

102−test-suite properties

73+test-suite squeal-postgresql-specs

10374 default-language: Haskell2010

10475 type: exitcode-stdio-1.0

105− hs-source-dirs: test

106− ghc-options: -Wall

107− main-is: Property.hs

76+ hs-source-dirs: test/Specs

77+ ghc-options: -Wall -main-is Specs

78+ main-is: Specs.hs

79+ other-modules: ExceptionHandling

10880 build-depends:

10981 base >= 4.10.0.0

11082 , bytestring >= 0.10.8.2

111− , hedgehog >= 1.0

112− , mtl >= 2.2.2

113− , scientific >= 0.3.5.3

114− , squeal-postgresql

115− , time >= 1.8.0.2

116−

117−test-suite spec

118− default-language: Haskell2010

119− type: exitcode-stdio-1.0

120− hs-source-dirs: test

121− ghc-options: -Wall

122− main-is: Spec.hs

123− build-depends:

124− base >= 4.10.0.0

125− , async >= 2.2.2

126− , bytestring >= 0.10.8.2

12783 , generics-sop >= 0.3.1.0

12884 , hspec >= 2.4.8

129− , mtl >= 2.2.2

13085 , squeal-postgresql

13186 , text >= 1.2.2.2

87+ , transformers >= 0.5.2.0

88+ , transformers-base >= 0.4.4

13289 , vector >= 0.12.0.1

13390

134−executable example

91+executable squeal-postgresql-example

13592 default-language: Haskell2010

13693 hs-source-dirs: exe

13794 ghc-options: -Wall

@@ -144,4 +101,5 @@ executable example

144101 , squeal-postgresql

145102 , text >= 1.2.2.2

146103 , transformers >= 0.5.2.0

104+ , transformers-base >= 0.4.4

147105 , vector >= 0.12.0.1

squeal-postgresql/src/Squeal/PostgreSQL.hs+51−70

@@ -1,7 +1,7 @@

11{-|

22Module: Squeal.PostgreSQL

3−Description: Squeal export module

4−Copyright: (c) Eitan Chatav, 2019

3+Description: Squeel export module

4+Copyright: (c) Eitan Chatav, 2017

55Maintainer: eitan@morphism.tech

66Stability: experimental

@@ -11,15 +11,17 @@ Let's see an example!

1111First, we need some language extensions because Squeal uses modern GHC

1212features.

1313

14−>>> :set -XDataKinds -XDeriveGeneric -XOverloadedLabels -XFlexibleContexts

14+>>> :set -XDataKinds -XDeriveGeneric -XOverloadedLabels

1515>>> :set -XOverloadedStrings -XTypeApplications -XTypeOperators -XGADTs

1616

1717We'll need some imports.

1818

19−>>> import Control.Monad.IO.Class (liftIO)

19+>>> import Control.Monad (void)

20+>>> import Control.Monad.Base (liftBase)

2021>>> import Data.Int (Int32)

2122>>> import Data.Text (Text)

2223>>> import Squeal.PostgreSQL

24+>>> import Squeal.PostgreSQL.Render

2325

2426We'll use generics to easily convert between Haskell and PostgreSQL values.

2527

@@ -58,7 +60,7 @@ yielding a `TableType`, or to pair a `ColumnConstraint` with a `NullityType`,

5860yielding a `ColumnType`. It is intended to connote Haskell's @=>@ operator

5961

6062Next, we'll write `Definition`s to set up and tear down the schema. In

61−Squeal, a `Definition` like `createTable`, `alterTable` or `dropTable`

63+Squeal, a `Definition` like `createTable`, `alterTable` or `dropTable`

6264has two type parameters, corresponding to the schema

6365before being run and the schema after. We can compose definitions using `>>>`.

6466Here and in the rest of our commands we make use of overloaded

@@ -67,7 +69,7 @@ labels to refer to named tables and columns in our schema.

6769>>> :{

6870let

6971 setup :: Definition (Public '[]) Schemas

70− setup =

72+ setup =

7173 createTable #users

7274 ( serial `as` #id :*

7375 (text & notNullable) `as` #name )

@@ -102,23 +104,25 @@ let

102104DROP TABLE "emails";

103105DROP TABLE "users";

104106

105−We'll need a Haskell type for @User@s. We give the type `Generics.SOP.Generic` and

106−`Generics.SOP.HasDatatypeInfo` instances so that we can encode and decode @User@s.

107−

108−>>> data User = User { userName :: Text, userEmail :: Maybe Text } deriving (Show, GHC.Generic)

109−>>> instance SOP.Generic User

110−>>> instance SOP.HasDatatypeInfo User

111−

112−Next, we'll write `Manipulation_`s to insert @User@s into our two tables.

113−A `Manipulation_` like `insertInto`, `update` or `deleteFrom`

114−has three type parameters, the schemas it refers to, input parameters

115−and an output row. When

107+Next, we'll write `Manipulation`s to insert data into our two tables.

108+A `Manipulation` like `insertInto`, `update` or `deleteFrom`

109+has three type parameters, the schema it refers to, a list of parameters

110+it can take as input, and a list of columns it produces as output. When

116111we insert into the users table, we will need a parameter for the @name@

117112field but not for the @id@ field. Since it's serial, we can use a default

118113value. However, since the emails table refers to the users table, we will

119114need to retrieve the user id that the insert generates and insert it into

120−the emails table. We can do this in a single `Manipulation_` by using a

121−`with` statement.

115+the emails table. Take a careful look at the type and definition of both

116+of our inserts.

117+

118+We'll need a Haskell type for users. We give the type `Generics.SOP.Generic` and

119+`Generics.SOP.HasDatatypeInfo` instances so that we can decode the rows

120+we receive when we run @getUsers@. Notice that the record fields of the

121+@User@ type match the column names of @getUsers@.

122+

123+>>> data User = User { userName :: Text, userEmail :: Maybe Text } deriving (Show, GHC.Generic)

124+>>> instance SOP.Generic User

125+>>> instance SOP.HasDatatypeInfo User

122126

123127>>> :{

124128let

@@ -126,20 +130,19 @@ let

126130 insertUser = with (u `as` #u) e

127131 where

128132 u = insertInto #users

129− (Values_ (Default `as` #id :* Set (param @1) `as` #name))

133+ (Values_ (defaultAs #id :* param @1 `as` #name))

130134 OnConflictDoRaise (Returning_ (#id :* param @2 `as` #email))

131− e = insertInto_ #emails $ Select

132− (Default `as` #id :* Set (#u ! #id) `as` #user_id :* Set (#u ! #email) `as` #email)

133− (from (common #u))

135+ e = insertInto_ #emails

136+ (Select (defaultAs #id :* #u ! #id `as` #user_id :* #u ! #email) (from (common #u)))

134137:}

135138

136139>>> printSQL insertUser

137140WITH "u" AS (INSERT INTO "users" ("id", "name") VALUES (DEFAULT, ($1 :: text)) RETURNING "id" AS "id", ($2 :: text) AS "email") INSERT INTO "emails" ("user_id", "email") SELECT "u"."id", "u"."email" FROM "u" AS "u"

138141

139−Next we write a `Query_` to retrieve users from the database. We're not

142+Next we write a `Query` to retrieve users from the database. We're not

140143interested in the ids here, just the usernames and email addresses. We

141−need to use an `innerJoin` to get the right result. A `Query_` is like a

142−`Manipulation_` with the same kind of type parameters.

144+need to use an inner join to get the right result. A `Query` is like a

145+`Manipulation` with the same kind of type parameters.

143146

144147>>> :{

145148let

@@ -159,7 +162,7 @@ Let's create some users to add to the database.

159162>>> :{

160163let

161164 users :: [User]

162− users =

165+ users =

163166 [ User "Alice" (Just "alice@gmail.com")

164167 , User "Bob" Nothing

165168 , User "Carole" (Just "carole@hotmail.com")

@@ -181,53 +184,31 @@ let

181184 _ <- traversePrepared_ insertUser users

182185 usersResult <- runQuery getUsers

183186 usersRows <- getRows usersResult

184− liftIO $ print (usersRows :: [User])

187+ liftBase $ print (usersRows :: [User])

185188in

186− withConnection "host=localhost port=5432 dbname=exampledb" $

189+ void . withConnection "host=localhost port=5432 dbname=exampledb" $

187190 define setup

188191 & pqThen session

189192 & pqThen (define teardown)

190193:}

191194[User {userName = "Alice", userEmail = Just "alice@gmail.com"},User {userName = "Bob", userEmail = Nothing},User {userName = "Carole", userEmail = Just "carole@hotmail.com"}]

192195-}

193−module Squeal.PostgreSQL (module X, RenderSQL(..), printSQL) where

194−

195−import Squeal.PostgreSQL.Alias as X

196−import Squeal.PostgreSQL.Binary as X

197−import Squeal.PostgreSQL.Definition as X

198−import Squeal.PostgreSQL.Definition.Function as X

199−import Squeal.PostgreSQL.Definition.Index as X

200−import Squeal.PostgreSQL.Definition.Schema as X

201−import Squeal.PostgreSQL.Definition.Table as X

202−import Squeal.PostgreSQL.Definition.Table.Constraint as X

203−import Squeal.PostgreSQL.Definition.Type as X

204−import Squeal.PostgreSQL.Definition.View as X

205−import Squeal.PostgreSQL.Expression as X

206−import Squeal.PostgreSQL.Expression.Aggregate as X

207−import Squeal.PostgreSQL.Expression.Collection as X

208−import Squeal.PostgreSQL.Expression.Comparison as X

209−import Squeal.PostgreSQL.Expression.Json as X

210−import Squeal.PostgreSQL.Expression.Literal as X

211−import Squeal.PostgreSQL.Expression.Logic as X

212−import Squeal.PostgreSQL.Expression.Math as X

213−import Squeal.PostgreSQL.Expression.Null as X

214−import Squeal.PostgreSQL.Expression.Parameter as X

215−import Squeal.PostgreSQL.Expression.Range as X

216−import Squeal.PostgreSQL.Expression.Set as X

217−import Squeal.PostgreSQL.Expression.Sort as X

218−import Squeal.PostgreSQL.Expression.Subquery as X

219−import Squeal.PostgreSQL.Expression.Text as X

220−import Squeal.PostgreSQL.Expression.TextSearch as X

221−import Squeal.PostgreSQL.Expression.Time as X

222−import Squeal.PostgreSQL.Expression.Type as X

223−import Squeal.PostgreSQL.Expression.Window as X

224−import Squeal.PostgreSQL.List as X

225−import Squeal.PostgreSQL.Manipulation as X

226−import Squeal.PostgreSQL.Migration as X

227−import Squeal.PostgreSQL.PG as X

228−import Squeal.PostgreSQL.Pool as X

229−import Squeal.PostgreSQL.PQ as X

230−import Squeal.PostgreSQL.Query as X

231−import Squeal.PostgreSQL.Render (RenderSQL(..), printSQL)

232−import Squeal.PostgreSQL.Schema as X

233−import Squeal.PostgreSQL.Transaction as X

196+module Squeal.PostgreSQL

197+ ( module Squeal.PostgreSQL.Binary

198+ , module Squeal.PostgreSQL.Definition

199+ , module Squeal.PostgreSQL.Expression

200+ , module Squeal.PostgreSQL.Manipulation

201+ , module Squeal.PostgreSQL.PQ

202+ , module Squeal.PostgreSQL.Query

203+ , module Squeal.PostgreSQL.Schema

204+ , module Squeal.PostgreSQL.Transaction

205+ ) where

206+

207+import Squeal.PostgreSQL.Binary

208+import Squeal.PostgreSQL.Definition

209+import Squeal.PostgreSQL.Expression

210+import Squeal.PostgreSQL.Manipulation

211+import Squeal.PostgreSQL.PQ

212+import Squeal.PostgreSQL.Query

213+import Squeal.PostgreSQL.Schema

214+import Squeal.PostgreSQL.Transaction

squeal-postgresql/src/Squeal/PostgreSQL/Alias.hsdeleted−249

@@ -1,249 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Alias

3−Description: Aliases

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−This module embeds Postgres's alias system in Haskell in

9−a typesafe fashion. Thanks to GHC's @OverloadedLabels@ extension,

10−Squeal can reference aliases by prepending with a @#@.

11−-}

12−

13−{-# LANGUAGE

14− AllowAmbiguousTypes

15− , ConstraintKinds

16− , DeriveAnyClass

17− , DeriveGeneric

18− , FlexibleContexts

19− , FlexibleInstances

20− , FunctionalDependencies

21− , GADTs

22− , LambdaCase

23− , OverloadedStrings

24− , QuantifiedConstraints

25− , RankNTypes

26− , ScopedTypeVariables

27− , StandaloneDeriving

28− , TypeApplications

29− , TypeFamilyDependencies

30− , TypeInType

31− , TypeOperators

32− , UndecidableInstances

33− , UndecidableSuperClasses

34−#-}

35−

36−module Squeal.PostgreSQL.Alias

37− ( (:::)

38− , Alias (..)

39− , IsLabel (..)

40− , Aliased (As)

41− , Aliasable (as)

42− , renderAliased

43− , Has

44− , HasUnique

45− , HasAll

46− , HasIn

47− , QualifiedAlias (..)

48− , IsQualified (..)

49− -- * Grouping

50− , Grouping (..)

51− , GroupedBy

52− ) where

53−

54−import Control.DeepSeq

55−import Data.ByteString (ByteString)

56−import Data.String (fromString)

57−import GHC.OverloadedLabels

58−import GHC.TypeLits

59−

60−import qualified Generics.SOP as SOP

61−import qualified GHC.Generics as GHC

62−

63−import Squeal.PostgreSQL.List

64−import Squeal.PostgreSQL.Render

65−

66−-- $setup

67−-- >>> import Squeal.PostgreSQL

68−

69−-- | The alias operator `:::` is like a promoted version of `As`,

70−-- a type level pair between an alias and some type.

71−type (:::) (alias :: Symbol) ty = '(alias,ty)

72−infixr 6 :::

73−

74−

75−-- | `Grouping` is an auxiliary namespace, created by

76−-- @GROUP BY@ clauses (`Squeal.PostgreSQL.Query.group`), and used

77−-- for typesafe aggregation

78−data Grouping

79− = Ungrouped -- ^ no aggregation permitted

80− | Grouped [(Symbol,Symbol)] -- ^ aggregation required for any column which is not grouped

81−

82−{- | A `GroupedBy` constraint indicates that a table qualified column is

83−a member of the auxiliary namespace created by @GROUP BY@ clauses and thus,

84−may be called in an output `Squeal.PostgreSQL.Expression.Expression` without aggregating.

85−-}

86−class (KnownSymbol table, KnownSymbol column)

87− => GroupedBy table column bys where

88−instance {-# OVERLAPPING #-} (KnownSymbol table, KnownSymbol column)

89− => GroupedBy table column ('(table,column) ': bys)

90−instance {-# OVERLAPPABLE #-}

91− ( KnownSymbol table

92− , KnownSymbol column

93− , GroupedBy table column bys

94− ) => GroupedBy table column (tabcol ': bys)

95−

96−-- | `Alias`es are proxies for a type level string or `Symbol`

97−-- and have an `IsLabel` instance so that with @-XOverloadedLabels@

98−--

99−-- >>> :set -XOverloadedLabels

100−-- >>> #foobar :: Alias "foobar"

101−-- Alias

102−data Alias (alias :: Symbol) = Alias

103− deriving (Eq,GHC.Generic,Ord,Show,NFData)

104−instance alias1 ~ alias2 => IsLabel alias1 (Alias alias2) where

105− fromLabel = Alias

106−instance aliases ~ '[alias] => IsLabel alias (NP Alias aliases) where

107− fromLabel = fromLabel SOP.:* Nil

108−-- | >>> printSQL (#jimbob :: Alias "jimbob")

109−-- "jimbob"

110−instance KnownSymbol alias => RenderSQL (Alias alias) where

111− renderSQL = doubleQuoted . fromString . symbolVal

112−

113−-- >>> printSQL (#jimbob :* #kandi :: NP Alias '["jimbob", "kandi"])

114−-- "jimbob", "kandi"

115−instance SOP.All KnownSymbol aliases => RenderSQL (NP Alias aliases) where

116− renderSQL

117− = commaSeparated

118− . SOP.hcollapse

119− . SOP.hcmap (SOP.Proxy @KnownSymbol) (SOP.K . renderSQL)

120−

121−-- | The `As` operator is used to name an expression. `As` is like a demoted

122−-- version of `:::`.

123−--

124−-- >>> Just "hello" `As` #hi :: Aliased Maybe ("hi" ::: String)

125−-- As (Just "hello") Alias

126−data Aliased expression aliased where

127− As

128− :: KnownSymbol alias

129− => expression ty

130− -> Alias alias

131− -> Aliased expression (alias ::: ty)

132−deriving instance Show (expression ty)

133− => Show (Aliased expression (alias ::: ty))

134−deriving instance Eq (expression ty)

135− => Eq (Aliased expression (alias ::: ty))

136−deriving instance Ord (expression ty)

137− => Ord (Aliased expression (alias ::: ty))

138−instance (alias0 ~ alias1, alias0 ~ alias2, KnownSymbol alias2)

139− => IsLabel alias0 (Aliased Alias (alias1 ::: alias2)) where

140− fromLabel = fromLabel @alias2 `As` fromLabel @alias1

141−

142−-- | The `Aliasable` class provides a way to scrap your `Nil`s

143−-- in an `NP` list of `Aliased` expressions.

144−class KnownSymbol alias => Aliasable alias expression aliased

145− | aliased -> expression

146− , aliased -> alias

147− where as :: expression -> Alias alias -> aliased

148−instance (KnownSymbol alias, aliased ~ (alias ::: ty)) => Aliasable alias

149− (expression ty)

150− (Aliased expression aliased)

151− where

152− as = As

153−instance (KnownSymbol alias, tys ~ '[alias ::: ty]) => Aliasable alias

154− (expression ty)

155− (NP (Aliased expression) tys)

156− where

157− expression `as` alias = expression `As` alias SOP.:* Nil

158−

159−-- | >>> let renderMaybe = fromString . maybe "Nothing" (const "Just")

160−-- >>> renderAliased renderMaybe (Just (3::Int) `As` #an_int)

161−-- "Just AS \"an_int\""

162−renderAliased

163− :: (forall ty. expression ty -> ByteString)

164− -> Aliased expression aliased

165− -> ByteString

166−renderAliased render (expression `As` alias) =

167− render expression <> " AS " <> renderSQL alias

168−

169−-- | @HasUnique alias fields field@ is a constraint that proves that

170−-- @fields@ is a singleton of @alias ::: field@.

171−type HasUnique alias fields field = fields ~ '[alias ::: field]

172−

173−-- | @Has alias fields field@ is a constraint that proves that

174−-- @fields@ has a field of @alias ::: field@, inferring @field@

175−-- from @alias@ and @fields@.

176−class KnownSymbol alias =>

177− Has (alias :: Symbol) (fields :: [(Symbol,kind)]) (field :: kind)

178− | alias fields -> field where

179−instance {-# OVERLAPPING #-} KnownSymbol alias

180− => Has alias (alias ::: field ': fields) field

181−instance {-# OVERLAPPABLE #-} (KnownSymbol alias, Has alias fields field)

182− => Has alias (field' ': fields) field

183−

184−{-| @HasIn fields (alias ::: field)@ is a constraint that proves that

185−@fields@ has a field of @alias ::: field@. It is used in @UPDATE@s to

186−choose which subfields to update.

187−-}

188−class HasIn fields field where

189−instance (Has alias fields field) => HasIn fields (alias ::: field) where

190−

191−-- | `HasAll` extends `Has` to take lists of @aliases@ and @fields@ and infer

192−-- a list of @subfields@.

193−class

194− ( SOP.All KnownSymbol aliases

195− ) => HasAll

196− (aliases :: [Symbol])

197− (fields :: [(Symbol,kind)])

198− (subfields :: [(Symbol,kind)])

199− | aliases fields -> subfields where

200−instance {-# OVERLAPPING #-} HasAll '[] fields '[]

201−instance {-# OVERLAPPABLE #-}

202− (Has alias fields field, HasAll aliases fields subfields)

203− => HasAll (alias ': aliases) fields (alias ::: field ': subfields)

204−

205−-- | Analagous to `IsLabel`, the constraint

206−-- `IsQualified` defines `!` for a column alias qualified

207−-- by a table alias.

208−class IsQualified table column expression where

209− (!) :: Alias table -> Alias column -> expression

210− infixl 9 !

211−instance IsQualified table column (Alias table, Alias column) where (!) = (,)

212−

213−{-| `QualifiedAlias`es enables multi-schema support by allowing a reference

214−to a `Squeal.PostgreSQL.Schema.Table`, `Squeal.PostgreSQL.Schema.Typedef`

215−or `Squeal.PostgreSQL.Schema.View` to be qualified by their schemas. By default,

216−a qualifier of @public@ is provided.

217−

218−>>> :{

219−let

220− alias1 :: QualifiedAlias "sch" "tab"

221− alias1 = #sch ! #tab

222− alias2 :: QualifiedAlias "public" "vw"

223− alias2 = #vw

224−in printSQL alias1 >> printSQL alias2

225−:}

226−"sch"."tab"

227−"vw"

228−-}

229−data QualifiedAlias (qualifier :: Symbol) (alias :: Symbol) = QualifiedAlias

230− deriving (Eq,GHC.Generic,Ord,Show,NFData)

231−instance (q ~ q', a ~ a') => IsQualified q a (QualifiedAlias q' a') where

232− _!_ = QualifiedAlias

233−instance (q' ~ "public", a ~ a') => IsLabel a (QualifiedAlias q' a') where

234− fromLabel = QualifiedAlias

235−instance (q0 ~ q1, a0 ~ a1, a1 ~ a2, KnownSymbol a2) =>

236− IsQualified q0 a0 (Aliased (QualifiedAlias q1) (a1 ::: a2)) where

237− _!_ = QualifiedAlias `As` Alias

238−instance (q ~ "public", a0 ~ a1, a1 ~ a2, KnownSymbol a2) =>

239− IsLabel a0 (Aliased (QualifiedAlias q) (a1 ::: a2)) where

240− fromLabel = QualifiedAlias `As` Alias

241−

242−instance (KnownSymbol q, KnownSymbol a)

243− => RenderSQL (QualifiedAlias q a) where

244− renderSQL _ =

245− let

246− qualifier = renderSQL (Alias @q)

247− alias = renderSQL (Alias @a)

248− in

249− if qualifier == "\"public\"" then alias else qualifier <> "." <> alias

squeal-postgresql/src/Squeal/PostgreSQL/Binary.hs+345−221

@@ -16,7 +16,7 @@ Let's see some examples. We'll need some imports

1616>>> import Data.Int (Int16)

1717>>> import Data.Text (Text)

1818>>> import Control.Monad (void)

19−>>> import Control.Monad.IO.Class (liftIO)

19+>>> import Control.Monad.Base (liftBase)

2020>>> import Squeal.PostgreSQL

2121

2222Define a Haskell datatype @Row@ that will serve as both the input and output of a simple

@@ -39,10 +39,10 @@ the input and output should be equal.

3939

4040>>> let input = Row 2 "hi" (Just True)

4141>>> :{

42−withConnection "host=localhost port=5432 dbname=exampledb" $ do

42+void . withConnection "host=localhost port=5432 dbname=exampledb" $ do

4343 result <- runQueryParams roundTrip input

4444 Just output <- firstRow result

45− liftIO . print $ input == output

45+ liftBase . print $ input == output

4646:}

4747True

4848

@@ -78,10 +78,10 @@ let

7878>>> :set -XOverloadedLists

7979>>> let input = Row (VarArray [1,2]) (FixArray (Just 1,Nothing)) (FixArray ((1,2),(3,4),(5,6)))

8080>>> :{

81−withConnection "host=localhost port=5432 dbname=exampledb" $ do

81+void . withConnection "host=localhost port=5432 dbname=exampledb" $ do

8282 result <- runQueryParams roundTrip input

8383 Just output <- firstRow result

84− liftIO . print $ input == output

84+ liftBase . print $ input == output

8585:}

8686True

8787

@@ -168,9 +168,9 @@ let

168168 session = do

169169 result <- runQueryParams roundTrip input

170170 Just output <- firstRow result

171− liftIO . print $ input == output

171+ liftBase . print $ input == output

172172in

173− withConnection "host=localhost port=5432 dbname=exampledb" $

173+ void . withConnection "host=localhost port=5432 dbname=exampledb" $

174174 define setup

175175 & pqThen session

176176 & pqThen (define teardown)

@@ -202,37 +202,46 @@ True

202202#-}

203203

204204module Squeal.PostgreSQL.Binary

205− ( -- * Encoding

206− ToParam (..)

205+ ( -- * PG type families

206+ PG

207+ , NullPG

208+ , TuplePG

209+ , RowPG

210+ , LabelsPG

211+ , FromPG

212+ -- * Storage newtypes

213+ , Money (..)

214+ , Json (..)

215+ , Jsonb (..)

216+ , Composite (..)

217+ , Enumerated (..)

218+ , VarArray (..)

219+ , FixArray (..)

220+ -- * Encoding

221+ , ToParam (..)

207222 , ToParams (..)

208− , ToNullityParam (..)

209− , ToField (..)

210− , ToFixArray (..)

211223 -- * Decoding

212224 , FromValue (..)

213225 , FromRow (..)

214− , FromField (..)

215− , FromFixArray (..)

216226 -- * Only

217227 , Only (..)

218− -- * Oid

219− , OidOf (..)

220− , OidOfParam (..)

221− , OidOfField (..)

228+ , P (..)

222229 ) where

223230

224231import BinaryParser

225232import ByteString.StrictBuilder (builderLength, int32BE, int64BE, word32BE)

226233import Control.Arrow (left)

227234import Control.Monad

235+import Data.Aeson (Value)

236+import Data.ByteString (ByteString)

228237import Data.Int

229238import Data.Kind

230239import Data.Scientific

240+import Data.Text (Text)

231241import Data.Time

232242import Data.UUID.Types

233243import Data.Vector (Vector)

234244import Data.Word

235−import Foreign.C.Types (CUInt(CUInt))

236245import Generics.SOP

237246import Generics.SOP.Record

238247import GHC.TypeLits

@@ -246,14 +255,11 @@ import qualified Data.Text.Lazy as Lazy (Text)

246255import qualified Data.Text as Strict (Text)

247256import qualified Data.Text as Strict.Text

248257import qualified Data.Vector as Vector

249−import qualified Database.PostgreSQL.LibPQ as LibPQ

258+import qualified Generics.SOP.Type.Metadata as Type

250259import qualified GHC.Generics as GHC

251260import qualified PostgreSQL.Binary.Decoding as Decoding

252261import qualified PostgreSQL.Binary.Encoding as Encoding

253262

254−import Squeal.PostgreSQL.Alias

255−import Squeal.PostgreSQL.List

256−import Squeal.PostgreSQL.PG

257263import Squeal.PostgreSQL.Schema

258264

259265-- | A `ToParam` constraint gives an encoding of a Haskell `Type` into

@@ -277,9 +283,11 @@ class ToParam (x :: Type) (pg :: PGType) where

277283 toParam :: x -> K Encoding.Encoding pg

278284instance ToParam Bool 'PGbool where toParam = K . Encoding.bool

279285instance ToParam Int16 'PGint2 where toParam = K . Encoding.int2_int16

286+instance ToParam Word16 'PGint2 where toParam = K . Encoding.int2_word16

280287instance ToParam Int32 'PGint4 where toParam = K . Encoding.int4_int32

288+instance ToParam Word32 'PGint4 where toParam = K . Encoding.int4_word32

281289instance ToParam Int64 'PGint8 where toParam = K . Encoding.int8_int64

282−instance ToParam Oid 'PGoid where toParam = K . Encoding.int4_word32 . getOid

290+instance ToParam Word64 'PGint8 where toParam = K . Encoding.int8_word64

283291instance ToParam Float 'PGfloat4 where toParam = K . Encoding.float4

284292instance ToParam Double 'PGfloat8 where toParam = K . Encoding.float8

285293instance ToParam Scientific 'PGnumeric where toParam = K . Encoding.numeric

@@ -312,26 +320,24 @@ instance Aeson.ToJSON x => ToParam (Json x) 'PGjson where

312320instance Aeson.ToJSON x => ToParam (Jsonb x) 'PGjsonb where

313321 toParam = K . Encoding.jsonb_bytes

314322 . Lazy.ByteString.toStrict . Aeson.encode . getJsonb

315−instance (ToNullityParam x ty, ty ~ nullity pg, OidOf pg)

323+instance (ToNullityParam x ty, ty ~ nullity pg, HasOid pg)

316324 => ToParam (VarArray [x]) ('PGvararray ty) where

317325 toParam = K

318− . Encoding.array_foldable

319− (getOid (oidOf @pg)) (unK . toNullityParam @x @ty)

326+ . Encoding.array_foldable (oid @pg) (unK . toNullityParam @x @ty)

320327 . getVarArray

321−instance (ToParam x pg, OidOf pg)

328+instance (ToParam x pg, HasOid pg)

322329 => ToParam (VarArray (Vector x)) ('PGvararray ('NotNull pg)) where

323330 toParam = K

324− . Encoding.array_vector (getOid (oidOf @pg)) (unK . toParam @x @pg)

331+ . Encoding.array_vector (oid @pg) (unK . toParam @x @pg)

325332 . getVarArray

326−instance (ToParam x pg, OidOf pg)

333+instance (ToParam x pg, HasOid pg)

327334 => ToParam (VarArray (Vector (Maybe x))) ('PGvararray ('Null pg)) where

328335 toParam = K

329− . Encoding.nullableArray_vector

330− (getOid (oidOf @pg)) (unK . toParam @x @pg)

336+ . Encoding.nullableArray_vector (oid @pg) (unK . toParam @x @pg)

331337 . getVarArray

332−instance (ToFixArray x dims ty, ty ~ nullity pg, OidOf pg)

338+instance (ToFixArray x dims ty, ty ~ nullity pg, HasOid pg)

333339 => ToParam (FixArray x) ('PGfixarray dims ty) where

334− toParam = K . Encoding.array (getOid (oidOf @pg))

340+ toParam = K . Encoding.array (oid @pg)

335341 . unK . unK . toFixArray @x @dims @ty . getFixArray

336342instance

337343 ( IsEnumType x

@@ -356,7 +362,7 @@ instance

356362 ( SListI fields

357363 , IsRecord x xs

358364 , AllZip ToField xs fields

359− , All OidOfField fields

365+ , All HasAliasedOid fields

360366 ) => ToParam (Composite x) ('PGcomposite fields) where

361367 toParam =

362368 let

@@ -364,7 +370,7 @@ instance

364370 encoders = htrans (Proxy @ToField) toField

365371

366372 composite

367− :: All OidOfField row

373+ :: All HasAliasedOid row

368374 => NP (K (Maybe Encoding.Encoding)) row

369375 -> K Encoding.Encoding ('PGcomposite row)

370376 composite fields = K $

@@ -381,142 +387,27 @@ instance

381387 int32BE (fromIntegral (lengthSList (Proxy @xs))) <>

382388 let

383389 each

384− :: OidOfField field

390+ :: HasAliasedOid field

385391 => K (Maybe Encoding.Encoding) field

386392 -> Encoding.Encoding

387393 each (K field :: K (Maybe Encoding.Encoding) field) =

388− word32BE (getOid (oidOfField @field))

394+ word32BE (aliasedOid @field)

389395 <> case field of

390396 Nothing -> int64BE (-1)

391397 Just value ->

392398 int32BE (fromIntegral (builderLength value))

393399 <> value

394400 in

395− hcfoldMap (Proxy @OidOfField) each fields

401+ hcfoldMap (Proxy @HasAliasedOid) each fields

396402

397403 in

398404 composite . encoders . toRecord . getComposite

399405

400−-- | The object identifier of a `PGType`.

401−--

402−-- >>> :set -XTypeApplications

403−-- >>> oidOf @'PGbool

404−-- Oid 16

405−class OidOf (ty :: PGType) where oidOf :: LibPQ.Oid

406−instance OidOf 'PGbool where oidOf = LibPQ.Oid 16

407−instance OidOf ('PGfixarray ns (null 'PGbool)) where oidOf = LibPQ.Oid 1000

408−instance OidOf ('PGvararray (null 'PGbool)) where oidOf = LibPQ.Oid 1000

409−instance OidOf 'PGint2 where oidOf = LibPQ.Oid 21

410−instance OidOf ('PGfixarray ns (null 'PGint2)) where oidOf = LibPQ.Oid 1005

411−instance OidOf ('PGvararray (null 'PGint2)) where oidOf = LibPQ.Oid 1005

412−instance OidOf 'PGint4 where oidOf = LibPQ.Oid 23

413−instance OidOf ('PGfixarray ns (null 'PGint4)) where oidOf = LibPQ.Oid 1007

414−instance OidOf ('PGvararray (null 'PGint4)) where oidOf = LibPQ.Oid 1007

415−instance OidOf 'PGint8 where oidOf = LibPQ.Oid 20

416−instance OidOf ('PGfixarray ns (null 'PGint8)) where oidOf = LibPQ.Oid 1016

417−instance OidOf ('PGvararray (null 'PGint8)) where oidOf = LibPQ.Oid 1016

418−instance OidOf 'PGnumeric where oidOf = LibPQ.Oid 1700

419−instance OidOf ('PGfixarray ns (null 'PGnumeric)) where oidOf = LibPQ.Oid 1231

420−instance OidOf ('PGvararray (null 'PGnumeric)) where oidOf = LibPQ.Oid 1231

421−instance OidOf 'PGfloat4 where oidOf = LibPQ.Oid 700

422−instance OidOf ('PGfixarray ns (null 'PGfloat4)) where oidOf = LibPQ.Oid 1021

423−instance OidOf ('PGvararray (null 'PGfloat4)) where oidOf = LibPQ.Oid 1021

424−instance OidOf 'PGfloat8 where oidOf = LibPQ.Oid 701

425−instance OidOf ('PGfixarray ns (null 'PGfloat8)) where oidOf = LibPQ.Oid 1022

426−instance OidOf ('PGvararray (null 'PGfloat8)) where oidOf = LibPQ.Oid 1022

427−instance OidOf 'PGmoney where oidOf = LibPQ.Oid 790

428−instance OidOf ('PGfixarray ns (null 'PGmoney)) where oidOf = LibPQ.Oid 791

429−instance OidOf ('PGvararray (null 'PGmoney)) where oidOf = LibPQ.Oid 791

430−instance OidOf ('PGchar n) where oidOf = LibPQ.Oid 18

431−instance OidOf ('PGfixarray ns (null ('PGchar n))) where oidOf = LibPQ.Oid 1002

432−instance OidOf ('PGvararray (null ('PGchar n))) where oidOf = LibPQ.Oid 1002

433−instance OidOf ('PGvarchar n) where oidOf = LibPQ.Oid 1043

434−instance OidOf ('PGfixarray ns (null ('PGvarchar n))) where oidOf = LibPQ.Oid 1015

435−instance OidOf ('PGvararray (null ('PGvarchar n))) where oidOf = LibPQ.Oid 1015

436−instance OidOf 'PGtext where oidOf = LibPQ.Oid 25

437−instance OidOf ('PGfixarray ns (null 'PGtext)) where oidOf = LibPQ.Oid 1009

438−instance OidOf ('PGvararray (null 'PGtext)) where oidOf = LibPQ.Oid 1009

439−instance OidOf 'PGbytea where oidOf = LibPQ.Oid 17

440−instance OidOf ('PGfixarray ns (null 'PGbytea)) where oidOf = LibPQ.Oid 1001

441−instance OidOf ('PGvararray (null 'PGbytea)) where oidOf = LibPQ.Oid 1001

442−instance OidOf 'PGtimestamp where oidOf = LibPQ.Oid 1114

443−instance OidOf ('PGfixarray ns (null 'PGtimestamp)) where oidOf = LibPQ.Oid 1115

444−instance OidOf ('PGvararray (null 'PGtimestamp)) where oidOf = LibPQ.Oid 1115

445−instance OidOf 'PGtimestamptz where oidOf = LibPQ.Oid 1184

446−instance OidOf ('PGfixarray ns (null 'PGtimestamptz)) where oidOf = LibPQ.Oid 1185

447−instance OidOf ('PGvararray (null 'PGtimestamptz)) where oidOf = LibPQ.Oid 1185

448−instance OidOf 'PGdate where oidOf = LibPQ.Oid 1082

449−instance OidOf ('PGfixarray ns (null 'PGdate)) where oidOf = LibPQ.Oid 1182

450−instance OidOf ('PGvararray (null 'PGdate)) where oidOf = LibPQ.Oid 1182

451−instance OidOf 'PGtime where oidOf = LibPQ.Oid 1083

452−instance OidOf ('PGfixarray ns (null 'PGtime)) where oidOf = LibPQ.Oid 1183

453−instance OidOf ('PGvararray (null 'PGtime)) where oidOf = LibPQ.Oid 1183

454−instance OidOf 'PGtimetz where oidOf = LibPQ.Oid 1266

455−instance OidOf ('PGfixarray ns (null 'PGtimetz)) where oidOf = LibPQ.Oid 1270

456−instance OidOf ('PGvararray (null 'PGtimetz)) where oidOf = LibPQ.Oid 1270

457−instance OidOf 'PGinterval where oidOf = LibPQ.Oid 1186

458−instance OidOf ('PGfixarray ns (null 'PGinterval)) where oidOf = LibPQ.Oid 1187

459−instance OidOf ('PGvararray (null 'PGinterval)) where oidOf = LibPQ.Oid 1187

460−instance OidOf 'PGuuid where oidOf = LibPQ.Oid 2950

461−instance OidOf ('PGfixarray ns (null 'PGuuid)) where oidOf = LibPQ.Oid 2951

462−instance OidOf ('PGvararray (null 'PGuuid)) where oidOf = LibPQ.Oid 2951

463−instance OidOf 'PGinet where oidOf = LibPQ.Oid 869

464−instance OidOf ('PGfixarray ns (null 'PGinet)) where oidOf = LibPQ.Oid 1041

465−instance OidOf ('PGvararray (null 'PGinet)) where oidOf = LibPQ.Oid 1041

466−instance OidOf 'PGjson where oidOf = LibPQ.Oid 114

467−instance OidOf ('PGfixarray ns (null 'PGjson)) where oidOf = LibPQ.Oid 199

468−instance OidOf ('PGvararray (null 'PGjson)) where oidOf = LibPQ.Oid 199

469−instance OidOf 'PGjsonb where oidOf = LibPQ.Oid 3802

470−instance OidOf ('PGfixarray ns (null 'PGjsonb)) where oidOf = LibPQ.Oid 3807

471−instance OidOf ('PGvararray (null 'PGjsonb)) where oidOf = LibPQ.Oid 3807

472−instance OidOf 'PGtsvector where oidOf = LibPQ.Oid 3614

473−instance OidOf ('PGfixarray ns (null 'PGtsvector)) where oidOf = LibPQ.Oid 3643

474−instance OidOf ('PGvararray (null 'PGtsvector)) where oidOf = LibPQ.Oid 3643

475−instance OidOf 'PGtsquery where oidOf = LibPQ.Oid 3615

476−instance OidOf ('PGfixarray ns (null 'PGtsquery)) where oidOf = LibPQ.Oid 3645

477−instance OidOf ('PGvararray (null 'PGtsquery)) where oidOf = LibPQ.Oid 3645

478−instance OidOf 'PGoid where oidOf = LibPQ.Oid 26

479−instance OidOf ('PGfixarray ns (null 'PGoid)) where oidOf = LibPQ.Oid 1028

480−instance OidOf ('PGvararray (null 'PGoid)) where oidOf = LibPQ.Oid 1028

481−instance OidOf ('PGrange 'PGint4) where oidOf = LibPQ.Oid 3904

482−instance OidOf ('PGfixarray ns (null ('PGrange 'PGint4))) where oidOf = LibPQ.Oid 3905

483−instance OidOf ('PGvararray (null ('PGrange 'PGint4))) where oidOf = LibPQ.Oid 3905

484−instance OidOf ('PGrange 'PGint8) where oidOf = LibPQ.Oid 3926

485−instance OidOf ('PGfixarray ns (null ('PGrange 'PGint8))) where oidOf = LibPQ.Oid 3927

486−instance OidOf ('PGvararray (null ('PGrange 'PGint8))) where oidOf = LibPQ.Oid 3927

487−instance OidOf ('PGrange 'PGnumeric) where oidOf = LibPQ.Oid 3906

488−instance OidOf ('PGfixarray ns (null ('PGrange 'PGnumeric))) where oidOf = LibPQ.Oid 3907

489−instance OidOf ('PGvararray (null ('PGrange 'PGnumeric))) where oidOf = LibPQ.Oid 3907

490−instance OidOf ('PGrange 'PGtimestamp) where oidOf = LibPQ.Oid 3908

491−instance OidOf ('PGfixarray ns (null ('PGrange 'PGtimestamp))) where oidOf = LibPQ.Oid 3909

492−instance OidOf ('PGvararray (null ('PGrange 'PGtimestamp))) where oidOf = LibPQ.Oid 3909

493−instance OidOf ('PGrange 'PGtimestamptz) where oidOf = LibPQ.Oid 3910

494−instance OidOf ('PGfixarray ns (null ('PGrange 'PGtimestamptz))) where oidOf = LibPQ.Oid 3911

495−instance OidOf ('PGvararray (null ('PGrange 'PGtimestamptz))) where oidOf = LibPQ.Oid 3911

496−instance OidOf ('PGrange 'PGdate) where oidOf = LibPQ.Oid 3912

497−instance OidOf ('PGfixarray ns (null ('PGrange 'PGdate))) where oidOf = LibPQ.Oid 3913

498−instance OidOf ('PGvararray (null ('PGrange 'PGdate))) where oidOf = LibPQ.Oid 3913

499−instance {-# OVERLAPPABLE #-} OidOf ('PGrange ty) where oidOf = LibPQ.invalidOid

500−instance {-# OVERLAPPABLE #-} OidOf ('PGfixarray ns (null ('PGrange ty))) where oidOf = LibPQ.invalidOid

501−instance {-# OVERLAPPABLE #-} OidOf ('PGvararray (null ('PGrange ty))) where oidOf = LibPQ.invalidOid

502−instance {-# OVERLAPPABLE #-} OidOf ('PGcomposite row) where oidOf = LibPQ.invalidOid

503−instance {-# OVERLAPPABLE #-} OidOf ('PGfixarray ns (null ('PGcomposite row))) where oidOf = LibPQ.invalidOid

504−instance {-# OVERLAPPABLE #-} OidOf ('PGvararray (null ('PGcomposite row))) where oidOf = LibPQ.invalidOid

505−instance {-# OVERLAPPABLE #-} OidOf ('PGenum labels) where oidOf = LibPQ.invalidOid

506−instance {-# OVERLAPPABLE #-} OidOf ('PGfixarray ns (null ('PGenum labels))) where oidOf = LibPQ.invalidOid

507−instance {-# OVERLAPPABLE #-} OidOf ('PGvararray (null ('PGenum labels))) where oidOf = LibPQ.invalidOid

508−

509−class OidOfParam (ty :: NullityType) where oidOfParam :: Oid

510−instance OidOf ty => OidOfParam (null ty) where oidOfParam = oidOf @ty

511−

512−-- | Lifts a `OidOf` constraint to a field.

513−class OidOfField (field :: (Symbol, NullityType)) where

514− oidOfField :: Oid

515−instance OidOf ty => OidOfField (alias ::: nullity ty) where

516− oidOfField = oidOf @ty

517−

518−-- | A `ToNullityParam` constraint gives an encoding of a Haskell `Type` into

519−-- into the binary format of a PostgreSQL `NullityType`.

406+class HasAliasedOid (field :: (Symbol, NullityType)) where

407+ aliasedOid :: Word32

408+instance HasOid ty => HasAliasedOid (alias ::: nullity ty) where

409+ aliasedOid = oid @ty

410+

520411class ToNullityParam (x :: Type) (ty :: NullityType) where

521412 toNullityParam :: x -> K (Maybe Encoding.Encoding) ty

522413instance ToParam x pg => ToNullityParam x ('NotNull pg) where

@@ -524,19 +415,11 @@ instance ToParam x pg => ToNullityParam x ('NotNull pg) where

524415instance ToParam x pg => ToNullityParam (Maybe x) ('Null pg) where

525416 toNullityParam = K . fmap (unK . toParam @x @pg)

526417

527−-- | A `ToField` constraint lifts the `ToParam` parser

528−-- to an encoding of a @(Symbol, Type)@ to a @(Symbol, NullityType)@,

529−-- encoding `Null`s to `Maybe`s. You should not define instances for

530−-- `FromField`, just use the provided instances.

531418class ToField (x :: (Symbol, Type)) (field :: (Symbol, NullityType)) where

532419 toField :: P x -> K (Maybe Encoding.Encoding) field

533420instance ToNullityParam x ty => ToField (alias ::: x) (alias ::: ty) where

534421 toField (P x) = K . unK $ toNullityParam @x @ty x

535422

536−-- | A `ToFixArray` constraint gives an encoding of a Haskell `Type`

537−-- into the binary format of a PostgreSQL fixed-length array.

538−-- You should not define instances for

539−-- `ToFixArray`, just use the provided instances.

540423class ToFixArray (x :: Type) (dims :: [Nat]) (array :: NullityType) where

541424 toFixArray :: x -> K (K Encoding.Array dims) array

542425instance ToNullityParam x ty => ToFixArray x '[] ty where

@@ -582,7 +465,6 @@ instance FromValue 'PGbool Bool where fromValue = Decoding.bool

582465instance FromValue 'PGint2 Int16 where fromValue = Decoding.int

583466instance FromValue 'PGint4 Int32 where fromValue = Decoding.int

584467instance FromValue 'PGint8 Int64 where fromValue = Decoding.int

585−instance FromValue 'PGoid Word32 where fromValue = Decoding.int

586468instance FromValue 'PGfloat4 Float where fromValue = Decoding.float4

587469instance FromValue 'PGfloat8 Double where fromValue = Decoding.float8

588470instance FromValue 'PGnumeric Scientific where fromValue = Decoding.numeric

@@ -721,10 +603,6 @@ instance FromValue pg y

721603 K (Just bytestring) -> P . Just <$>

722604 Decoding.valueParser (fromValue @pg) bytestring

723605

724−-- | A `FromFixArray` constraint gives a decoding to a Haskell `Type`

725−-- from the binary format of a PostgreSQL fixed-length array.

726−-- You should not define instances for

727−-- `FromFixArray`, just use the provided instances.

728606class FromFixArray (dims :: [Nat]) (ty :: NullityType) (y :: Type) where

729607 fromFixArray :: Decoding.Array y

730608instance FromValue pg y => FromFixArray '[] ('NotNull pg) y where

@@ -769,53 +647,50 @@ instance

769647 = fmap fromRecord

770648 . hsequence'

771649 . htrans (Proxy @FromField) fromField

772−------------------------------------------------------

773−-- P records

774−------------------------------------------------------

775−-- instance (FromField (col ::: pg) (col ::: hask))

776−-- => FromRow '[col ::: pg] (P (col ::: hask)) where

777−-- fromRow (pg :* Nil) = (unComp . fromField) pg

778−-- instance

779−-- ( row ~ Join row1 row2

780−-- , FromRow row1 hask1

781−-- , FromRow row2 hask2

782−-- , SListI row

783−-- ) => FromRow row (hask1, hask2) where

784−-- fromRow row = case disjoin @row1 @row2 row of

785−-- (row1, row2) -> (,) <$> fromRow row1 <*> fromRow row2

786−-- instance

787−-- ( row ~ Join row1 row23

788−-- , FromRow row1 hask1

789−-- , FromRow row23 (hask2, hask3)

790−-- , SListI row

791−-- ) => FromRow row (hask1, hask2, hask3) where

792−-- fromRow row = case disjoin @row1 @row23 row of

793−-- (row1, row23) -> do

794−-- hask1 <- fromRow row1

795−-- (hask2, hask3) <- fromRow row23

796−-- return (hask1, hask2, hask3)

797−-- instance

798−-- ( row ~ Join row1 row234

799−-- , FromRow row1 hask1

800−-- , FromRow row234 (hask2, hask3, hask4)

801−-- , SListI row

802−-- ) => FromRow row (hask1, hask2, hask3, hask4) where

803−-- fromRow row = case disjoin @row1 @row234 row of

804−-- (row1, row234) -> do

805−-- hask1 <- fromRow row1

806−-- (hask2, hask3, hask4) <- fromRow row234

807−-- return (hask1, hask2, hask3, hask4)

808−-- instance

809−-- ( row ~ Join row1 row2345

810−-- , FromRow row1 hask1

811−-- , FromRow row2345 (hask2, hask3, hask4, hask5)

812−-- , SListI row

813−-- ) => FromRow row (hask1, hask2, hask3, hask4, hask5) where

814−-- fromRow row = case disjoin @row1 @row2345 row of

815−-- (row1, row2345) -> do

816−-- hask1 <- fromRow row1

817−-- (hask2, hask3, hask4, hask5) <- fromRow row2345

818−-- return (hask1, hask2, hask3, hask4, hask5)

650+instance (FromField (col ::: pg) (col ::: hask))

651+ => FromRow '[col ::: pg] (P (col ::: hask)) where

652+ fromRow (pg :* Nil) = (unComp . fromField) pg

653+instance

654+ ( row ~ Join row1 row2

655+ , FromRow row1 hask1

656+ , FromRow row2 hask2

657+ , SListI row

658+ ) => FromRow row (hask1, hask2) where

659+ fromRow row = case disjoin @row1 @row2 row of

660+ (row1, row2) -> (,) <$> fromRow row1 <*> fromRow row2

661+instance

662+ ( row ~ Join row1 row23

663+ , FromRow row1 hask1

664+ , FromRow row23 (hask2, hask3)

665+ , SListI row

666+ ) => FromRow row (hask1, hask2, hask3) where

667+ fromRow row = case disjoin @row1 @row23 row of

668+ (row1, row23) -> do

669+ hask1 <- fromRow row1

670+ (hask2, hask3) <- fromRow row23

671+ return (hask1, hask2, hask3)

672+instance

673+ ( row ~ Join row1 row234

674+ , FromRow row1 hask1

675+ , FromRow row234 (hask2, hask3, hask4)

676+ , SListI row

677+ ) => FromRow row (hask1, hask2, hask3, hask4) where

678+ fromRow row = case disjoin @row1 @row234 row of

679+ (row1, row234) -> do

680+ hask1 <- fromRow row1

681+ (hask2, hask3, hask4) <- fromRow row234

682+ return (hask1, hask2, hask3, hask4)

683+instance

684+ ( row ~ Join row1 row2345

685+ , FromRow row1 hask1

686+ , FromRow row2345 (hask2, hask3, hask4, hask5)

687+ , SListI row

688+ ) => FromRow row (hask1, hask2, hask3, hask4, hask5) where

689+ fromRow row = case disjoin @row1 @row2345 row of

690+ (row1, row2345) -> do

691+ hask1 <- fromRow row1

692+ (hask2, hask3, hask4, hask5) <- fromRow row2345

693+ return (hask1, hask2, hask3, hask4, hask5)

819694

820695-- | `Only` is a 1-tuple type, useful for encoding a single parameter with

821696-- `toParams` or decoding a single value with `fromRow`.

@@ -844,5 +719,254 @@ replicateMN

844719replicateMN mx = hsequence' $

845720 hcpure (Proxy :: Proxy ((~) x)) (Comp (I <$> mx))

846721

847−getOid :: LibPQ.Oid -> Word32

848−getOid (LibPQ.Oid (CUInt oid)) = oid

722+{- | The `Money` newtype stores a monetary value in terms

723+of the number of cents, i.e. @$2,000.20@ would be expressed as

724+@Money { cents = 200020 }@.

725+

726+>>> import Control.Monad (void)

727+>>> import Control.Monad.Base (liftBase)

728+>>> import Squeal.PostgreSQL

729+>>> :{

730+let

731+ roundTrip :: Query_ (Public '[]) (Only Money) (Only Money)

732+ roundTrip = values_ $ parameter @1 money `as` #fromOnly

733+:}

734+

735+>>> let input = Only (Money 20020)

736+

737+>>> :{

738+void . withConnection "host=localhost port=5432 dbname=exampledb" $ do

739+ result <- runQueryParams roundTrip input

740+ Just output <- firstRow result

741+ liftBase . print $ input == output

742+:}

743+True

744+-}

745+newtype Money = Money { cents :: Int64 }

746+ deriving (Eq, Ord, Show, Read, GHC.Generic)

747+type instance PG Money = 'PGmoney

748+

749+{- | The `Json` newtype is an indication that the Haskell

750+type it's applied to should be stored as a `PGjson`.

751+-}

752+newtype Json hask = Json {getJson :: hask}

753+ deriving (Eq, Ord, Show, Read, GHC.Generic)

754+type instance PG (Json hask) = 'PGjson

755+

756+{- | The `Jsonb` newtype is an indication that the Haskell

757+type it's applied to should be stored as a `PGjsonb`.

758+-}

759+newtype Jsonb hask = Jsonb {getJsonb :: hask}

760+ deriving (Eq, Ord, Show, Read, GHC.Generic)

761+type instance PG (Jsonb hask) = 'PGjsonb

762+

763+{- | The `Composite` newtype is an indication that the Haskell

764+type it's applied to should be stored as a `PGcomposite`.

765+-}

766+newtype Composite record = Composite {getComposite :: record}

767+ deriving (Eq, Ord, Show, Read, GHC.Generic)

768+type instance PG (Composite hask) = 'PGcomposite (RowPG hask)

769+

770+{- | The `Enumerated` newtype is an indication that the Haskell

771+type it's applied to should be stored as a `PGenum`.

772+-}

773+newtype Enumerated enum = Enumerated {getEnumerated :: enum}

774+ deriving (Eq, Ord, Show, Read, GHC.Generic)

775+type instance PG (Enumerated hask) = 'PGenum (LabelsPG hask)

776+

777+{- | The `VarArray` newtype is an indication that the Haskell

778+type it's applied to should be stored as a `PGvararray`.

779+-}

780+newtype VarArray arr = VarArray {getVarArray :: arr}

781+ deriving (Eq, Ord, Show, Read, GHC.Generic)

782+type instance PG (VarArray (Vector hask)) = 'PGvararray (NullPG hask)

783+

784+{- | The `FixArray` newtype is an indication that the Haskell

785+type it's applied to should be stored as a `PGfixarray`.

786+-}

787+newtype FixArray arr = FixArray {getFixArray :: arr}

788+ deriving (Eq, Ord, Show, Read, GHC.Generic)

789+type instance PG (FixArray x) = 'PGfixarray (DimPG x) (FixPG x)

790+

791+type family DimPG (hask :: Type) :: [Nat] where

792+ DimPG (x,x) = 2 ': DimPG x

793+ DimPG (x,x,x) = 3 ': DimPG x

794+ DimPG (x,x,x,x) = 4 ': DimPG x

795+ DimPG (x,x,x,x,x) = 5 ': DimPG x

796+ DimPG (x,x,x,x,x,x) = 6 ': DimPG x

797+ DimPG (x,x,x,x,x,x,x) = 7 ': DimPG x

798+ DimPG (x,x,x,x,x,x,x,x) = 8 ': DimPG x

799+ DimPG (x,x,x,x,x,x,x,x,x) = 9 ': DimPG x

800+ DimPG (x,x,x,x,x,x,x,x,x,x) = 10 ': DimPG x

801+ DimPG x = '[]

802+

803+type family FixPG (hask :: Type) :: NullityType where

804+ FixPG (x,x) = FixPG x

805+ FixPG (x,x,x) = FixPG x

806+ FixPG (x,x,x,x) = FixPG x

807+ FixPG (x,x,x,x,x) = FixPG x

808+ FixPG (x,x,x,x,x,x) = FixPG x

809+ FixPG (x,x,x,x,x,x,x) = FixPG x

810+ FixPG (x,x,x,x,x,x,x,x) = FixPG x

811+ FixPG (x,x,x,x,x,x,x,x,x) = FixPG x

812+ FixPG (x,x,x,x,x,x,x,x,x,x) = FixPG x

813+ FixPG (x,x,x,x,x,x,x,x,x,x,x) = FixPG x

814+ FixPG x = NullPG x

815+

816+{- | The `PG` type family embeds a subset of Haskell types

817+as Postgres types. As an open type family, `PG` is extensible.

818+

819+>>> :kind! PG LocalTime

820+PG LocalTime :: PGType

821+= 'PGtimestamp

822+

823+>>> newtype MyDouble = My Double

824+>>> :set -XTypeFamilies

825+>>> type instance PG MyDouble = 'PGfloat8

826+-}

827+type family PG (hask :: Type) :: PGType

828+type instance PG Bool = 'PGbool

829+type instance PG Int16 = 'PGint2

830+type instance PG Int32 = 'PGint4

831+type instance PG Int64 = 'PGint8

832+type instance PG Word16 = 'PGint2

833+type instance PG Word32 = 'PGint4

834+type instance PG Word64 = 'PGint8

835+type instance PG Scientific = 'PGnumeric

836+type instance PG Float = 'PGfloat4

837+type instance PG Double = 'PGfloat8

838+type instance PG Char = 'PGchar 1

839+type instance PG Text = 'PGtext

840+type instance PG Lazy.Text = 'PGtext

841+type instance PG String = 'PGtext

842+type instance PG ByteString = 'PGbytea

843+type instance PG Lazy.ByteString = 'PGbytea

844+type instance PG LocalTime = 'PGtimestamp

845+type instance PG UTCTime = 'PGtimestamptz

846+type instance PG Day = 'PGdate

847+type instance PG TimeOfDay = 'PGtime

848+type instance PG (TimeOfDay, TimeZone) = 'PGtimetz

849+type instance PG DiffTime = 'PGinterval

850+type instance PG UUID = 'PGuuid

851+type instance PG (NetAddr IP) = 'PGinet

852+type instance PG Value = 'PGjson

853+

854+{-| The `LabelsPG` type family calculates the constructors of a

855+Haskell enum type.

856+

857+>>> data Schwarma = Beef | Lamb | Chicken deriving GHC.Generic

858+>>> instance Generic Schwarma

859+>>> instance HasDatatypeInfo Schwarma

860+>>> :kind! LabelsPG Schwarma

861+LabelsPG Schwarma :: [Type.ConstructorName]

862+= '["Beef", "Lamb", "Chicken"]

863+-}

864+type family LabelsPG (hask :: Type) :: [Type.ConstructorName] where

865+ LabelsPG hask =

866+ ConstructorNamesOf (ConstructorsOf (DatatypeInfoOf hask))

867+

868+{- | `RowPG` turns a Haskell record type into a `RowType`.

869+

870+>>> data Person = Person { name :: Text, age :: Int32 } deriving GHC.Generic

871+>>> instance Generic Person

872+>>> instance HasDatatypeInfo Person

873+>>> :kind! RowPG Person

874+RowPG Person :: [(Symbol, NullityType)]

875+= '["name" ::: 'NotNull 'PGtext, "age" ::: 'NotNull 'PGint4]

876+-}

877+type family RowPG (hask :: Type) :: RowType where

878+ RowPG (hask1, hask2) = Join (RowPG hask1) (RowPG hask2)

879+ RowPG (hask1, hask2, hask3) =

880+ Join (RowPG hask1) (RowPG (hask2, hask3))

881+ RowPG (hask1, hask2, hask3, hask4) =

882+ Join (RowPG hask1) (RowPG (hask2, hask3, hask4))

883+ RowPG (hask1, hask2, hask3, hask4, hask5) =

884+ Join (RowPG hask1) (RowPG (hask2, hask3, hask4, hask5))

885+ RowPG (P (col ::: head)) = '[col ::: NullPG head]

886+ RowPG hask = RowOf (RecordCodeOf hask)

887+

888+type family RowOf (record :: [(Symbol, Type)]) :: RowType where

889+ RowOf '[] = '[]

890+ RowOf (col ::: ty ': record) = col ::: NullPG ty ': RowOf record

891+

892+{- | `NullPG` turns a Haskell type into a `NullityType`.

893+

894+>>> :kind! NullPG Double

895+NullPG Double :: NullityType

896+= 'NotNull 'PGfloat8

897+>>> :kind! NullPG (Maybe Double)

898+NullPG (Maybe Double) :: NullityType

899+= 'Null 'PGfloat8

900+-}

901+type family NullPG (hask :: Type) :: NullityType where

902+ NullPG (Maybe hask) = 'Null (PG hask)

903+ NullPG hask = 'NotNull (PG hask)

904+

905+{- | `TuplePG` turns a Haskell tuple type (including record types) into

906+the corresponding list of `NullityType`s.

907+

908+>>> :kind! TuplePG (Double, Maybe Char)

909+TuplePG (Double, Maybe Char) :: [NullityType]

910+= '[ 'NotNull 'PGfloat8, 'Null ('PGchar 1)]

911+-}

912+type family TuplePG (hask :: Type) :: [NullityType] where

913+ TuplePG hask = TupleOf (TupleCodeOf hask (Code hask))

914+

915+type family TupleOf (tuple :: [Type]) :: [NullityType] where

916+ TupleOf '[] = '[]

917+ TupleOf (hask ': tuple) = NullPG hask ': TupleOf tuple

918+

919+type family TupleCodeOf (hask :: Type) (code :: [[Type]]) :: [Type] where

920+ TupleCodeOf hask '[tuple] = tuple

921+ TupleCodeOf hask '[] =

922+ TypeError

923+ ( 'Text "The type `" ':<>: 'ShowType hask ':<>: 'Text "' is not a tuple type."

924+ ':$$: 'Text "It is a void type with no constructors."

925+ )

926+ TupleCodeOf hask (_ ': _ ': _) =

927+ TypeError

928+ ( 'Text "The type `" ':<>: 'ShowType hask ':<>: 'Text "' is not a tuple type."

929+ ':$$: 'Text "It is a sum type with more than one constructor."

930+ )

931+

932+-- | Calculates constructors of a datatype.

933+type family ConstructorsOf (datatype :: Type.DatatypeInfo)

934+ :: [Type.ConstructorInfo] where

935+ ConstructorsOf ('Type.ADT _module _datatype constructors) =

936+ constructors

937+ ConstructorsOf ('Type.Newtype _module _datatype constructor) =

938+ '[constructor]

939+

940+-- | Calculates the name of a nullary constructor, otherwise

941+-- generates a type error.

942+type family ConstructorNameOf (constructors :: Type.ConstructorInfo)

943+ :: Type.ConstructorName where

944+ ConstructorNameOf ('Type.Constructor name) = name

945+ ConstructorNameOf ('Type.Infix name _assoc _fix) = TypeError

946+ ('Text "ConstructorNameOf error: non-nullary constructor "

947+ ':<>: 'Text name)

948+ ConstructorNameOf ('Type.Record name _fields) = TypeError

949+ ('Text "ConstructorNameOf error: non-nullary constructor "

950+ ':<>: 'Text name)

951+

952+-- | Calculate the names of nullary constructors.

953+type family ConstructorNamesOf (constructors :: [Type.ConstructorInfo])

954+ :: [Type.ConstructorName] where

955+ ConstructorNamesOf '[] = '[]

956+ ConstructorNamesOf (constructor ': constructors) =

957+ ConstructorNameOf constructor ': ConstructorNamesOf constructors

958+

959+type family FromPG (hask :: Type) :: FromType where

960+ FromPG (hask1, hask2) = Join (FromPG hask1) (FromPG hask2)

961+ FromPG (hask1, hask2, hask3) =

962+ Join (FromPG hask1) (FromPG (hask2, hask3))

963+ FromPG (hask1, hask2, hask3, hask4) =

964+ Join (FromPG hask1) (FromPG (hask2, hask3, hask4))

965+ FromPG (hask1, hask2, hask3, hask4, hask5) =

966+ Join (FromPG hask1) (FromPG (hask2, hask3, hask4, hask5))

967+ FromPG (P (col ::: hask)) = '[col ::: RowPG hask]

968+ FromPG hask = FromOf (RecordCodeOf hask)

969+

970+type family FromOf (record :: [(Symbol, Type)]) :: FromType where

971+ FromOf '[] = '[]

972+ FromOf (tab ::: ty ': record) = tab ::: RowPG ty ': FromOf record

squeal-postgresql/src/Squeal/PostgreSQL/Definition.hs+1012−15

@@ -11,15 +11,13 @@ Squeal data definition language.

1111{-# LANGUAGE

1212 AllowAmbiguousTypes

1313 , ConstraintKinds

14− , DeriveAnyClass

1514 , DeriveGeneric

16− , DerivingStrategies

1715 , FlexibleContexts

1816 , FlexibleInstances

1917 , GADTs

18+ , GeneralizedNewtypeDeriving

2019 , LambdaCase

2120 , MultiParamTypeClasses

22− , OverloadedLabels

2321 , OverloadedStrings

2422 , RankNTypes

2523 , ScopedTypeVariables

@@ -27,31 +25,82 @@ Squeal data definition language.

2725 , TypeInType

2826 , TypeOperators

2927 , UndecidableSuperClasses

30− , UndecidableInstances

3128#-}

3229

3330module Squeal.PostgreSQL.Definition

3431 ( -- * Definition

3532 Definition (..)

3633 , (>>>)

37− , manipDefinition

34+ -- * Tables

35+ -- ** Create

36+ , createSchema

37+ , createSchemaIfNotExists

38+ , createTable

39+ , createTableIfNotExists

40+ , createView

41+ , createTypeEnum

42+ , createTypeEnumFrom

43+ , createTypeComposite

44+ , createTypeCompositeFrom

45+ , createDomain

46+ , TableConstraintExpression (..)

47+ , check

48+ , unique

49+ , primaryKey

50+ , foreignKey

51+ , ForeignKeyed

52+ , OnDeleteClause (..)

53+ , OnUpdateClause (..)

54+ -- ** Drop

55+ , dropSchema

56+ , dropTable

57+ , dropView

58+ , dropType

59+ -- ** Alter

60+ , alterTable

61+ , alterTableRename

62+ , AlterTable (..)

63+ , addConstraint

64+ , dropConstraint

65+ , AddColumn (..)

66+ , dropColumn

67+ , renameColumn

68+ , alterColumn

69+ , AlterColumn (..)

70+ , setDefault

71+ , dropDefault

72+ , setNotNull

73+ , dropNotNull

74+ , alterType

75+ -- * Columns

76+ , ColumnTypeExpression (..)

77+ , nullable

78+ , notNullable

79+ , default_

80+ , serial2

81+ , smallserial

82+ , serial4

83+ , serial

84+ , serial8

85+ , bigserial

3886 ) where

3987

4088import Control.Category

4189import Control.DeepSeq

4290import Data.ByteString

4391import Data.Monoid

92+import GHC.TypeLits

4493import Prelude hiding ((.), id)

4594

95+import qualified Generics.SOP as SOP

4696import qualified GHC.Generics as GHC

4797

48−import Squeal.PostgreSQL.Manipulation

98+import Squeal.PostgreSQL.Binary

99+import Squeal.PostgreSQL.Expression

100+import Squeal.PostgreSQL.Query

49101import Squeal.PostgreSQL.Render

50102import Squeal.PostgreSQL.Schema

51103

52−-- $setup

53−-- >>> import Squeal.PostgreSQL

54−

55104{-----------------------------------------

56105statements

57106-----------------------------------------}

@@ -73,10 +122,958 @@ instance Category Definition where

73122 ddl1 . ddl0 = UnsafeDefinition $

74123 renderSQL ddl0 <> "\n" <> renderSQL ddl1

75124

76−-- | A `Manipulation` without input or output can be run as a statement

77−-- along with other `Definition`s, by embedding it using `manipDefinition`.

78−manipDefinition

79− :: Manipulation '[] schemas '[] '[]

80− -- ^ no input or output

125+{-----------------------------------------

126+CREATE statements

127+-----------------------------------------}

128+

129+createSchema

130+ :: KnownSymbol sch

131+ => Alias sch

132+ -> Definition schemas (Create sch '[] schemas)

133+createSchema sch = UnsafeDefinition $

134+ "CREATE" <+> "SCHEMA" <+> renderSQL sch <> ";"

135+

136+createSchemaIfNotExists

137+ :: (KnownSymbol sch, Has sch schemas schema)

138+ => Alias sch

81139 -> Definition schemas schemas

82−manipDefinition = UnsafeDefinition . (<> ";") . renderSQL

140+createSchemaIfNotExists sch = UnsafeDefinition $

141+ "CREATE" <+> "SCHEMA" <+> "IF" <+> "NOT" <+> "EXISTS"

142+ <+> renderSQL sch <> ";"

143+

144+{- | `createTable` adds a table to the schema.

145+

146+>>> :set -XOverloadedLabels

147+>>> :{

148+type Table = '[] :=>

149+ '[ "a" ::: 'NoDef :=> 'Null 'PGint4

150+ , "b" ::: 'NoDef :=> 'Null 'PGfloat4 ]

151+:}

152+

153+>>> :{

154+let

155+ setup :: Definition (Public '[]) (Public '["tab" ::: 'Table Table])

156+ setup = createTable #tab

157+ (nullable int `as` #a :* nullable real `as` #b) Nil

158+in printSQL setup

159+:}

160+CREATE TABLE "tab" ("a" int NULL, "b" real NULL);

161+-}

162+createTable

163+ :: ( KnownSymbol sch

164+ , KnownSymbol tab

165+ , columns ~ (col ': cols)

166+ , SOP.SListI columns

167+ , SOP.SListI constraints

168+ , Has sch schemas0 schema0

169+ , schemas1 ~ Alter sch (Create tab ('Table (constraints :=> columns)) schema0) schemas0 )

170+ => QualifiedAlias sch tab -- ^ the name of the table to add

171+ -> NP (Aliased (ColumnTypeExpression schemas0)) columns

172+ -- ^ the names and datatype of each column

173+ -> NP (Aliased (TableConstraintExpression sch tab schemas1)) constraints

174+ -- ^ constraints that must hold for the table

175+ -> Definition schemas0 schemas1

176+createTable tab columns constraints = UnsafeDefinition $

177+ "CREATE TABLE" <+> renderCreation tab columns constraints

178+

179+{-| `createTableIfNotExists` creates a table if it doesn't exist, but does not add it to the schema.

180+Instead, the schema already has the table so if the table did not yet exist, the schema was wrong.

181+`createTableIfNotExists` fixes this. Interestingly, this property makes it an idempotent in

182+the `Category` of `Definition`s.

183+

184+>>> :set -XOverloadedLabels -XTypeApplications

185+>>> :{

186+type Table = '[] :=>

187+ '[ "a" ::: 'NoDef :=> 'Null 'PGint4

188+ , "b" ::: 'NoDef :=> 'Null 'PGfloat4 ]

189+:}

190+

191+>>> type Schemas = Public '["tab" ::: 'Table Table]

192+

193+>>> :{

194+let

195+ setup :: Definition Schemas Schemas

196+ setup = createTableIfNotExists #tab

197+ (nullable int `as` #a :* nullable real `as` #b) Nil

198+in printSQL setup

199+:}

200+CREATE TABLE IF NOT EXISTS "tab" ("a" int NULL, "b" real NULL);

201+-}

202+createTableIfNotExists

203+ :: ( Has sch schemas schema

204+ , Has tab schema ('Table (constraints :=> columns))

205+ , SOP.SListI columns

206+ , SOP.SListI constraints )

207+ => QualifiedAlias sch tab -- ^ the name of the table to add

208+ -> NP (Aliased (ColumnTypeExpression schemas)) columns

209+ -- ^ the names and datatype of each column

210+ -> NP (Aliased (TableConstraintExpression sch tab schemas)) constraints

211+ -- ^ constraints that must hold for the table

212+ -> Definition schemas schemas

213+createTableIfNotExists tab columns constraints = UnsafeDefinition $

214+ "CREATE TABLE IF NOT EXISTS"

215+ <+> renderCreation tab columns constraints

216+

217+-- helper function for `createTable` and `createTableIfNotExists`

218+renderCreation

219+ :: ( KnownSymbol sch

220+ , KnownSymbol tab

221+ , SOP.SListI columns

222+ , SOP.SListI constraints )

223+ => QualifiedAlias sch tab -- ^ the name of the table to add

224+ -> NP (Aliased (ColumnTypeExpression schemas0)) columns

225+ -- ^ the names and datatype of each column

226+ -> NP (Aliased (TableConstraintExpression sch tab schemas1)) constraints

227+ -- ^ constraints that must hold for the table

228+ -> ByteString

229+renderCreation tab columns constraints = renderSQL tab

230+ <+> parenthesized

231+ ( renderCommaSeparated renderColumnDef columns

232+ <> ( case constraints of

233+ Nil -> ""

234+ _ -> ", " <>

235+ renderCommaSeparated renderConstraint constraints ) )

236+ <> ";"

237+ where

238+ renderColumnDef :: Aliased (ColumnTypeExpression schemas) x -> ByteString

239+ renderColumnDef (ty `As` column) =

240+ renderSQL column <+> renderColumnTypeExpression ty

241+ renderConstraint

242+ :: Aliased (TableConstraintExpression sch tab schemas) constraint

243+ -> ByteString

244+ renderConstraint (constraint `As` alias) =

245+ "CONSTRAINT" <+> renderSQL alias <+> renderSQL constraint

246+

247+-- | Data types are a way to limit the kind of data that can be stored in a

248+-- table. For many applications, however, the constraint they provide is

249+-- too coarse. For example, a column containing a product price should

250+-- probably only accept positive values. But there is no standard data type

251+-- that accepts only positive numbers. Another issue is that you might want

252+-- to constrain column data with respect to other columns or rows.

253+-- For example, in a table containing product information,

254+-- there should be only one row for each product number.

255+-- `TableConstraint`s give you as much control over the data in your tables

256+-- as you wish. If a user attempts to store data in a column that would

257+-- violate a constraint, an error is raised. This applies

258+-- even if the value came from the default value definition.

259+newtype TableConstraintExpression

260+ (sch :: Symbol)

261+ (tab :: Symbol)

262+ (schemas :: SchemasType)

263+ (constraint :: TableConstraint)

264+ = UnsafeTableConstraintExpression

265+ { renderTableConstraintExpression :: ByteString }

266+ deriving (GHC.Generic,Show,Eq,Ord,NFData)

267+instance RenderSQL

268+ (TableConstraintExpression sch tab schemas constraint) where

269+ renderSQL = renderTableConstraintExpression

270+

271+{-| A `check` constraint is the most generic `TableConstraint` type.

272+It allows you to specify that the value in a certain column must satisfy

273+a Boolean (truth-value) expression.

274+

275+>>> :{

276+type Schema = '[

277+ "tab" ::: 'Table ('[ "inequality" ::: 'Check '["a","b"]] :=> '[

278+ "a" ::: 'NoDef :=> 'NotNull 'PGint4,

279+ "b" ::: 'NoDef :=> 'NotNull 'PGint4

280+ ])]

281+:}

282+

283+>>> :{

284+let

285+ definition :: Definition (Public '[]) (Public Schema)

286+ definition = createTable #tab

287+ ( (int & notNullable) `as` #a :*

288+ (int & notNullable) `as` #b )

289+ ( check (#a :* #b) (#a .> #b) `as` #inequality )

290+:}

291+

292+>>> printSQL definition

293+CREATE TABLE "tab" ("a" int NOT NULL, "b" int NOT NULL, CONSTRAINT "inequality" CHECK (("a" > "b")));

294+-}

295+check

296+ :: ( Has sch schemas schema

297+ , Has tab schema ('Table table)

298+ , HasAll aliases (TableToRow table) subcolumns )

299+ => NP Alias aliases

300+ -- ^ specify the subcolumns which are getting checked

301+ -> (forall t. Condition '[] 'Ungrouped '[] schemas '[] '[t ::: subcolumns])

302+ -- ^ a closed `Condition` on those subcolumns

303+ -> TableConstraintExpression sch tab schemas ('Check aliases)

304+check _cols condition = UnsafeTableConstraintExpression $

305+ "CHECK" <+> parenthesized (renderSQL condition)

306+

307+{-| A `unique` constraint ensure that the data contained in a column,

308+or a group of columns, is unique among all the rows in the table.

309+

310+>>> :{

311+type Schema = '[

312+ "tab" ::: 'Table( '[ "uq_a_b" ::: 'Unique '["a","b"]] :=> '[

313+ "a" ::: 'NoDef :=> 'Null 'PGint4,

314+ "b" ::: 'NoDef :=> 'Null 'PGint4

315+ ])]

316+:}

317+

318+>>> :{

319+let

320+ definition :: Definition (Public '[]) (Public Schema)

321+ definition = createTable #tab

322+ ( (int & nullable) `as` #a :*

323+ (int & nullable) `as` #b )

324+ ( unique (#a :* #b) `as` #uq_a_b )

325+:}

326+

327+>>> printSQL definition

328+CREATE TABLE "tab" ("a" int NULL, "b" int NULL, CONSTRAINT "uq_a_b" UNIQUE ("a", "b"));

329+-}

330+unique

331+ :: ( Has sch schemas schema

332+ , Has tab schema('Table table)

333+ , HasAll aliases (TableToRow table) subcolumns )

334+ => NP Alias aliases

335+ -- ^ specify subcolumns which together are unique for each row

336+ -> TableConstraintExpression sch tab schemas ('Unique aliases)

337+unique columns = UnsafeTableConstraintExpression $

338+ "UNIQUE" <+> parenthesized (renderSQL columns)

339+

340+{-| A `primaryKey` constraint indicates that a column, or group of columns,

341+can be used as a unique identifier for rows in the table.

342+This requires that the values be both unique and not null.

343+

344+>>> :{

345+type Schema = '[

346+ "tab" ::: 'Table ('[ "pk_id" ::: 'PrimaryKey '["id"]] :=> '[

347+ "id" ::: 'Def :=> 'NotNull 'PGint4,

348+ "name" ::: 'NoDef :=> 'NotNull 'PGtext

349+ ])]

350+:}

351+

352+>>> :{

353+let

354+ definition :: Definition (Public '[]) (Public Schema)

355+ definition = createTable #tab

356+ ( serial `as` #id :*

357+ (text & notNullable) `as` #name )

358+ ( primaryKey #id `as` #pk_id )

359+:}

360+

361+>>> printSQL definition

362+CREATE TABLE "tab" ("id" serial, "name" text NOT NULL, CONSTRAINT "pk_id" PRIMARY KEY ("id"));

363+-}

364+primaryKey

365+ :: ( Has sch schemas schema

366+ , Has tab schema ('Table table)

367+ , HasAll aliases (TableToColumns table) subcolumns

368+ , AllNotNull subcolumns )

369+ => NP Alias aliases

370+ -- ^ specify the subcolumns which together form a primary key.

371+ -> TableConstraintExpression sch tab schemas ('PrimaryKey aliases)

372+primaryKey columns = UnsafeTableConstraintExpression $

373+ "PRIMARY KEY" <+> parenthesized (renderSQL columns)

374+

375+{-| A `foreignKey` specifies that the values in a column

376+(or a group of columns) must match the values appearing in some row of

377+another table. We say this maintains the referential integrity

378+between two related tables.

379+

380+>>> :{

381+type Schema =

382+ '[ "users" ::: 'Table (

383+ '[ "pk_users" ::: 'PrimaryKey '["id"] ] :=>

384+ '[ "id" ::: 'Def :=> 'NotNull 'PGint4

385+ , "name" ::: 'NoDef :=> 'NotNull 'PGtext

386+ ])

387+ , "emails" ::: 'Table (

388+ '[ "pk_emails" ::: 'PrimaryKey '["id"]

389+ , "fk_user_id" ::: 'ForeignKey '["user_id"] "users" '["id"]

390+ ] :=>

391+ '[ "id" ::: 'Def :=> 'NotNull 'PGint4

392+ , "user_id" ::: 'NoDef :=> 'NotNull 'PGint4

393+ , "email" ::: 'NoDef :=> 'Null 'PGtext

394+ ])

395+ ]

396+:}

397+

398+>>> :{

399+let

400+ setup :: Definition (Public '[]) (Public Schema)

401+ setup =

402+ createTable #users

403+ ( serial `as` #id :*

404+ (text & notNullable) `as` #name )

405+ ( primaryKey #id `as` #pk_users ) >>>

406+ createTable #emails

407+ ( serial `as` #id :*

408+ (int & notNullable) `as` #user_id :*

409+ (text & nullable) `as` #email )

410+ ( primaryKey #id `as` #pk_emails :*

411+ foreignKey #user_id #users #id

412+ OnDeleteCascade OnUpdateCascade `as` #fk_user_id )

413+in printSQL setup

414+:}

415+CREATE TABLE "users" ("id" serial, "name" text NOT NULL, CONSTRAINT "pk_users" PRIMARY KEY ("id"));

416+CREATE TABLE "emails" ("id" serial, "user_id" int NOT NULL, "email" text NULL, CONSTRAINT "pk_emails" PRIMARY KEY ("id"), CONSTRAINT "fk_user_id" FOREIGN KEY ("user_id") REFERENCES "users" ("id") ON DELETE CASCADE ON UPDATE CASCADE);

417+

418+A `foreignKey` can even be a table self-reference.

419+

420+>>> :{

421+type Schema =

422+ '[ "employees" ::: 'Table (

423+ '[ "employees_pk" ::: 'PrimaryKey '["id"]

424+ , "employees_employer_fk" ::: 'ForeignKey '["employer_id"] "employees" '["id"]

425+ ] :=>

426+ '[ "id" ::: 'Def :=> 'NotNull 'PGint4

427+ , "name" ::: 'NoDef :=> 'NotNull 'PGtext

428+ , "employer_id" ::: 'NoDef :=> 'Null 'PGint4

429+ ])

430+ ]

431+:}

432+

433+>>> :{

434+let

435+ setup :: Definition (Public '[]) (Public Schema)

436+ setup =

437+ createTable #employees

438+ ( serial `as` #id :*

439+ (text & notNullable) `as` #name :*

440+ (integer & nullable) `as` #employer_id )

441+ ( primaryKey #id `as` #employees_pk :*

442+ foreignKey #employer_id #employees #id

443+ OnDeleteCascade OnUpdateCascade `as` #employees_employer_fk )

444+in printSQL setup

445+:}

446+CREATE TABLE "employees" ("id" serial, "name" text NOT NULL, "employer_id" integer NULL, CONSTRAINT "employees_pk" PRIMARY KEY ("id"), CONSTRAINT "employees_employer_fk" FOREIGN KEY ("employer_id") REFERENCES "employees" ("id") ON DELETE CASCADE ON UPDATE CASCADE);

447+-}

448+foreignKey

449+ :: (ForeignKeyed schemas sch schema child parent

450+ table reftable

451+ columns refcolumns

452+ constraints cols

453+ reftys tys )

454+ => NP Alias columns

455+ -- ^ column or columns in the table

456+ -> Alias parent

457+ -- ^ reference table

458+ -> NP Alias refcolumns

459+ -- ^ reference column or columns in the reference table

460+ -> OnDeleteClause

461+ -- ^ what to do when reference is deleted

462+ -> OnUpdateClause

463+ -- ^ what to do when reference is updated

464+ -> TableConstraintExpression sch child schemas

465+ ('ForeignKey columns parent refcolumns)

466+foreignKey keys parent refs ondel onupd = UnsafeTableConstraintExpression $

467+ "FOREIGN KEY" <+> parenthesized (renderSQL keys)

468+ <+> "REFERENCES" <+> renderSQL parent

469+ <+> parenthesized (renderSQL refs)

470+ <+> renderSQL ondel

471+ <+> renderSQL onupd

472+

473+-- | A constraint synonym between types involved in a foreign key constraint.

474+type ForeignKeyed schemas

475+ sch

476+ schema

477+ child parent

478+ table reftable

479+ columns refcolumns

480+ constraints cols

481+ reftys tys =

482+ ( Has sch schemas schema

483+ , Has child schema ('Table table)

484+ , Has parent schema ('Table reftable)

485+ , HasAll columns (TableToColumns table) tys

486+ , reftable ~ (constraints :=> cols)

487+ , HasAll refcolumns cols reftys

488+ , SOP.AllZip SamePGType tys reftys

489+ , Uniquely refcolumns constraints )

490+

491+-- | `OnDeleteClause` indicates what to do with rows that reference a deleted row.

492+data OnDeleteClause

493+ = OnDeleteNoAction

494+ -- ^ if any referencing rows still exist when the constraint is checked,

495+ -- an error is raised

496+ | OnDeleteRestrict -- ^ prevents deletion of a referenced row

497+ | OnDeleteCascade

498+ -- ^ specifies that when a referenced row is deleted,

499+ -- row(s) referencing it should be automatically deleted as well

500+ deriving (GHC.Generic,Show,Eq,Ord)

501+instance NFData OnDeleteClause

502+-- | Render `OnDeleteClause`.

503+instance RenderSQL OnDeleteClause where

504+ renderSQL = \case

505+ OnDeleteNoAction -> "ON DELETE NO ACTION"

506+ OnDeleteRestrict -> "ON DELETE RESTRICT"

507+ OnDeleteCascade -> "ON DELETE CASCADE"

508+

509+-- | Analagous to `OnDeleteClause` there is also `OnUpdateClause` which is invoked

510+-- when a referenced column is changed (updated).

511+data OnUpdateClause

512+ = OnUpdateNoAction

513+ -- ^ if any referencing rows has not changed when the constraint is checked,

514+ -- an error is raised

515+ | OnUpdateRestrict -- ^ prevents update of a referenced row

516+ | OnUpdateCascade

517+ -- ^ the updated values of the referenced column(s) should be copied

518+ -- into the referencing row(s)

519+ deriving (GHC.Generic,Show,Eq,Ord)

520+instance NFData OnUpdateClause

521+

522+-- | Render `OnUpdateClause`.

523+instance RenderSQL OnUpdateClause where

524+ renderSQL = \case

525+ OnUpdateNoAction -> "ON UPDATE NO ACTION"

526+ OnUpdateRestrict -> "ON UPDATE RESTRICT"

527+ OnUpdateCascade -> "ON UPDATE CASCADE"

528+

529+{-----------------------------------------

530+DROP statements

531+-----------------------------------------}

532+

533+-- >>> :{

534+-- let

535+-- definition :: Definition '["muh_schema" ::: schema, "public" ::: public] '["public" ::: public]

536+-- definition = dropSchema #muh_schema

537+-- :}

538+--

539+-- >>> printSQL definition

540+-- DROP SCHEMA "muh_schema";

541+dropSchema

542+ :: Has sch schemas schema

543+ => Alias sch

544+ -> Definition schemas (Drop sch schemas)

545+dropSchema sch = UnsafeDefinition $ "DROP SCHEMA" <+> renderSQL sch <> ";"

546+

547+-- | `dropTable` removes a table from the schema.

548+--

549+-- >>> :{

550+-- let

551+-- definition :: Definition '["public" ::: '["muh_table" ::: 'Table t]] (Public '[])

552+-- definition = dropTable #muh_table

553+-- :}

554+--

555+-- >>> printSQL definition

556+-- DROP TABLE "muh_table";

557+dropTable

558+ :: ( Has sch schemas schema

559+ , Has tab schema ('Table table))

560+ => QualifiedAlias sch tab -- ^ table to remove

561+ -> Definition schemas (Alter sch (Drop tab schema) schemas)

562+dropTable tab = UnsafeDefinition $ "DROP TABLE" <+> renderSQL tab <> ";"

563+

564+{-----------------------------------------

565+ALTER statements

566+-----------------------------------------}

567+

568+-- | `alterTable` changes the definition of a table from the schema.

569+alterTable

570+ :: (Has sch schemas schema, Has tab schema ('Table table0))

571+ => QualifiedAlias sch tab -- ^ table to alter

572+ -> AlterTable sch tab schemas table1 -- ^ alteration to perform

573+ -> Definition schemas (Alter sch (Alter tab ('Table table1) schema) schemas)

574+alterTable tab alteration = UnsafeDefinition $

575+ "ALTER TABLE"

576+ <+> renderSQL tab

577+ <+> renderAlterTable alteration

578+ <> ";"

579+

580+-- | `alterTableRename` changes the name of a table from the schema.

581+--

582+-- >>> printSQL $ alterTableRename #foo #bar

583+-- ALTER TABLE "foo" RENAME TO "bar";

584+alterTableRename

585+ :: (KnownSymbol table0, KnownSymbol table1)

586+ => Alias table0 -- ^ table to rename

587+ -> Alias table1 -- ^ what to rename it

588+ -> Definition schema (Rename table0 table1 schema)

589+alterTableRename table0 table1 = UnsafeDefinition $

590+ "ALTER TABLE" <+> renderSQL table0

591+ <+> "RENAME TO" <+> renderSQL table1 <> ";"

592+

593+-- | An `AlterTable` describes the alteration to perform on the columns

594+-- of a table.

595+newtype AlterTable

596+ (sch :: Symbol)

597+ (tab :: Symbol)

598+ (schemas :: SchemasType)

599+ (table :: TableType) =

600+ UnsafeAlterTable {renderAlterTable :: ByteString}

601+ deriving (GHC.Generic,Show,Eq,Ord,NFData)

602+

603+-- | An `addConstraint` adds a table constraint.

604+--

605+-- >>> :{

606+-- let

607+-- definition :: Definition

608+-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

609+-- '["public" ::: '["tab" ::: 'Table ('["positive" ::: 'Check '["col"]] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

610+-- definition = alterTable #tab (addConstraint #positive (check #col (#col .> 0)))

611+-- in printSQL definition

612+-- :}

613+-- ALTER TABLE "tab" ADD CONSTRAINT "positive" CHECK (("col" > 0));

614+addConstraint

615+ :: ( KnownSymbol alias

616+ , Has sch schemas schema

617+ , Has tab schema ('Table table0)

618+ , table0 ~ (constraints :=> columns)

619+ , table1 ~ (Create alias constraint constraints :=> columns) )

620+ => Alias alias

621+ -> TableConstraintExpression sch tab schemas constraint

622+ -- ^ constraint to add

623+ -> AlterTable sch tab schemas table1

624+addConstraint alias constraint = UnsafeAlterTable $

625+ "ADD" <+> "CONSTRAINT" <+> renderSQL alias

626+ <+> renderSQL constraint

627+

628+-- | A `dropConstraint` drops a table constraint.

629+--

630+-- >>> :{

631+-- let

632+-- definition :: Definition

633+-- '["public" ::: '["tab" ::: 'Table ('["positive" ::: Check '["col"]] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

634+-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

635+-- definition = alterTable #tab (dropConstraint #positive)

636+-- in printSQL definition

637+-- :}

638+-- ALTER TABLE "tab" DROP CONSTRAINT "positive";

639+dropConstraint

640+ :: ( KnownSymbol constraint

641+ , Has sch schemas schema

642+ , Has tab schema ('Table table0)

643+ , table0 ~ (constraints :=> columns)

644+ , table1 ~ (Drop constraint constraints :=> columns) )

645+ => Alias constraint

646+ -- ^ constraint to drop

647+ -> AlterTable sch tab schemas table1

648+dropConstraint constraint = UnsafeAlterTable $

649+ "DROP" <+> "CONSTRAINT" <+> renderSQL constraint

650+

651+-- | An `AddColumn` is either @NULL@ or has @DEFAULT@.

652+class AddColumn ty where

653+ -- | `addColumn` adds a new column, initially filled with whatever

654+ -- default value is given or with @NULL@.

655+ --

656+ -- >>> :{

657+ -- let

658+ -- definition :: Definition

659+ -- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col1" ::: 'NoDef :=> 'Null 'PGint4])]]

660+ -- '["public" ::: '["tab" ::: 'Table ('[] :=>

661+ -- '[ "col1" ::: 'NoDef :=> 'Null 'PGint4

662+ -- , "col2" ::: 'Def :=> 'Null 'PGtext ])]]

663+ -- definition = alterTable #tab (addColumn #col2 (text & nullable & default_ "foo"))

664+ -- in printSQL definition

665+ -- :}

666+ -- ALTER TABLE "tab" ADD COLUMN "col2" text NULL DEFAULT E'foo';

667+ --

668+ -- >>> :{

669+ -- let

670+ -- definition :: Definition

671+ -- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col1" ::: 'NoDef :=> 'Null 'PGint4])]]

672+ -- '["public" ::: '["tab" ::: 'Table ('[] :=>

673+ -- '[ "col1" ::: 'NoDef :=> 'Null 'PGint4

674+ -- , "col2" ::: 'NoDef :=> 'Null 'PGtext ])]]

675+ -- definition = alterTable #tab (addColumn #col2 (text & nullable))

676+ -- in printSQL definition

677+ -- :}

678+ -- ALTER TABLE "tab" ADD COLUMN "col2" text NULL;

679+ addColumn

680+ :: ( KnownSymbol column

681+ , Has sch schemas schema

682+ , Has tab schema ('Table table0)

683+ , table0 ~ (constraints :=> columns) )

684+ => Alias column -- ^ column to add

685+ -> ColumnTypeExpression schemas ty -- ^ type of the new column

686+ -> AlterTable sch tab schemas (constraints :=> Create column ty columns)

687+ addColumn column ty = UnsafeAlterTable $

688+ "ADD COLUMN" <+> renderSQL column <+> renderColumnTypeExpression ty

689+instance {-# OVERLAPPING #-} AddColumn ('Def :=> ty)

690+instance {-# OVERLAPPABLE #-} AddColumn ('NoDef :=> 'Null ty)

691+

692+-- | A `dropColumn` removes a column. Whatever data was in the column

693+-- disappears. Table constraints involving the column are dropped, too.

694+-- However, if the column is referenced by a foreign key constraint of

695+-- another table, PostgreSQL will not silently drop that constraint.

696+--

697+-- >>> :{

698+-- let

699+-- definition :: Definition

700+-- '["public" ::: '["tab" ::: 'Table ('[] :=>

701+-- '[ "col1" ::: 'NoDef :=> 'Null 'PGint4

702+-- , "col2" ::: 'NoDef :=> 'Null 'PGtext ])]]

703+-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col1" ::: 'NoDef :=> 'Null 'PGint4])]]

704+-- definition = alterTable #tab (dropColumn #col2)

705+-- in printSQL definition

706+-- :}

707+-- ALTER TABLE "tab" DROP COLUMN "col2";

708+dropColumn

709+ :: ( KnownSymbol column

710+ , Has sch schemas schema

711+ , Has tab schema ('Table table0)

712+ , table0 ~ (constraints :=> columns)

713+ , table1 ~ (constraints :=> Drop column columns) )

714+ => Alias column -- ^ column to remove

715+ -> AlterTable sch tab schemas table1

716+dropColumn column = UnsafeAlterTable $

717+ "DROP COLUMN" <+> renderSQL column

718+

719+-- | A `renameColumn` renames a column.

720+--

721+-- >>> :{

722+-- let

723+-- definition :: Definition

724+-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["foo" ::: 'NoDef :=> 'Null 'PGint4])]]

725+-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["bar" ::: 'NoDef :=> 'Null 'PGint4])]]

726+-- definition = alterTable #tab (renameColumn #foo #bar)

727+-- in printSQL definition

728+-- :}

729+-- ALTER TABLE "tab" RENAME COLUMN "foo" TO "bar";

730+renameColumn

731+ :: ( KnownSymbol column0

732+ , KnownSymbol column1

733+ , Has sch schemas schema

734+ , Has tab schema ('Table table0)

735+ , table0 ~ (constraints :=> columns)

736+ , table1 ~ (constraints :=> Rename column0 column1 columns) )

737+ => Alias column0 -- ^ column to rename

738+ -> Alias column1 -- ^ what to rename the column

739+ -> AlterTable sch tab schemas table1

740+renameColumn column0 column1 = UnsafeAlterTable $

741+ "RENAME COLUMN" <+> renderSQL column0 <+> "TO" <+> renderSQL column1

742+

743+-- | An `alterColumn` alters a single column.

744+alterColumn

745+ :: ( KnownSymbol column

746+ , Has sch schemas schema

747+ , Has tab schema ('Table table0)

748+ , table0 ~ (constraints :=> columns)

749+ , Has column columns ty0

750+ , table1 ~ (constraints :=> Alter column ty1 columns))

751+ => Alias column -- ^ column to alter

752+ -> AlterColumn schemas ty0 ty1 -- ^ alteration to perform

753+ -> AlterTable sch tab schemas table1

754+alterColumn column alteration = UnsafeAlterTable $

755+ "ALTER COLUMN" <+> renderSQL column <+> renderAlterColumn alteration

756+

757+-- | An `AlterColumn` describes the alteration to perform on a single column.

758+newtype AlterColumn (schemas :: SchemasType) (ty0 :: ColumnType) (ty1 :: ColumnType) =

759+ UnsafeAlterColumn {renderAlterColumn :: ByteString}

760+ deriving (GHC.Generic,Show,Eq,Ord,NFData)

761+

762+-- | A `setDefault` sets a new default for a column. Note that this doesn't

763+-- affect any existing rows in the table, it just changes the default for

764+-- future insert and update commands.

765+--

766+-- >>> :{

767+-- let

768+-- definition :: Definition

769+-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'Null 'PGint4])]]

770+-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'Def :=> 'Null 'PGint4])]]

771+-- definition = alterTable #tab (alterColumn #col (setDefault 5))

772+-- in printSQL definition

773+-- :}

774+-- ALTER TABLE "tab" ALTER COLUMN "col" SET DEFAULT 5;

775+setDefault

776+ :: Expression '[] 'Ungrouped '[] schemas '[] '[] ty -- ^ default value to set

777+ -> AlterColumn schemas (constraint :=> ty) ('Def :=> ty)

778+setDefault expression = UnsafeAlterColumn $

779+ "SET DEFAULT" <+> renderExpression expression

780+

781+-- | A `dropDefault` removes any default value for a column.

782+--

783+-- >>> :{

784+-- let

785+-- definition :: Definition

786+-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'Def :=> 'Null 'PGint4])]]

787+-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'Null 'PGint4])]]

788+-- definition = alterTable #tab (alterColumn #col dropDefault)

789+-- in printSQL definition

790+-- :}

791+-- ALTER TABLE "tab" ALTER COLUMN "col" DROP DEFAULT;

792+dropDefault :: AlterColumn schemas ('Def :=> ty) ('NoDef :=> ty)

793+dropDefault = UnsafeAlterColumn $ "DROP DEFAULT"

794+

795+-- | A `setNotNull` adds a @NOT NULL@ constraint to a column.

796+-- The constraint will be checked immediately, so the table data must satisfy

797+-- the constraint before it can be added.

798+--

799+-- >>> :{

800+-- let

801+-- definition :: Definition

802+-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'Null 'PGint4])]]

803+-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

804+-- definition = alterTable #tab (alterColumn #col setNotNull)

805+-- in printSQL definition

806+-- :}

807+-- ALTER TABLE "tab" ALTER COLUMN "col" SET NOT NULL;

808+setNotNull

809+ :: AlterColumn schemas (constraint :=> 'Null ty) (constraint :=> 'NotNull ty)

810+setNotNull = UnsafeAlterColumn $ "SET NOT NULL"

811+

812+-- | A `dropNotNull` drops a @NOT NULL@ constraint from a column.

813+--

814+-- >>> :{

815+-- let

816+-- definition :: Definition

817+-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

818+-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'Null 'PGint4])]]

819+-- definition = alterTable #tab (alterColumn #col dropNotNull)

820+-- in printSQL definition

821+-- :}

822+-- ALTER TABLE "tab" ALTER COLUMN "col" DROP NOT NULL;

823+dropNotNull

824+ :: AlterColumn schemas (constraint :=> 'NotNull ty) (constraint :=> 'Null ty)

825+dropNotNull = UnsafeAlterColumn $ "DROP NOT NULL"

826+

827+-- | An `alterType` converts a column to a different data type.

828+-- This will succeed only if each existing entry in the column can be

829+-- converted to the new type by an implicit cast.

830+--

831+-- >>> :{

832+-- let

833+-- definition :: Definition

834+-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

835+-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGnumeric])]]

836+-- definition =

837+-- alterTable #tab (alterColumn #col (alterType (numeric & notNullable)))

838+-- in printSQL definition

839+-- :}

840+-- ALTER TABLE "tab" ALTER COLUMN "col" TYPE numeric NOT NULL;

841+alterType :: ColumnTypeExpression schemas ty -> AlterColumn schemas ty0 ty

842+alterType ty = UnsafeAlterColumn $ "TYPE" <+> renderColumnTypeExpression ty

843+

844+{- | Create a view.

845+>>> type ABC = '["a" ::: 'NoDef :=> 'Null 'PGint4, "b" ::: 'NoDef :=> 'Null 'PGint4, "c" ::: 'NoDef :=> 'Null 'PGint4]

846+>>> type BC = '["b" ::: 'Null 'PGint4, "c" ::: 'Null 'PGint4]

847+>>> :{

848+let

849+ definition :: Definition

850+ '[ "public" ::: '["abc" ::: 'Table ('[] :=> ABC)]]

851+ '[ "public" ::: '["abc" ::: 'Table ('[] :=> ABC), "bc" ::: 'View BC]]

852+ definition =

853+ createView #bc (select_ (#b :* #c) (from (table #abc)))

854+in printSQL definition

855+:}

856+CREATE VIEW "bc" AS SELECT "b" AS "b", "c" AS "c" FROM "abc" AS "abc";

857+-}

858+createView

859+ :: (KnownSymbol sch, KnownSymbol vw, Has sch schemas schema)

860+ => QualifiedAlias sch vw -- ^ the name of the view to add

861+ -> Query '[] '[] schemas '[] view -- ^ query

862+ -> Definition schemas (Alter sch (Create vw ('View view) schema) schemas)

863+createView alias query = UnsafeDefinition $

864+ "CREATE" <+> "VIEW" <+> renderSQL alias <+> "AS"

865+ <+> renderQuery query <> ";"

866+

867+-- | Drop a view.

868+--

869+-- >>> :{

870+-- let

871+-- definition :: Definition

872+-- '[ "public" ::: '["abc" ::: 'Table ('[] :=> '["a" ::: 'NoDef :=> 'Null 'PGint4, "b" ::: 'NoDef :=> 'Null 'PGint4, "c" ::: 'NoDef :=> 'Null 'PGint4])

873+-- , "bc" ::: 'View ('["b" ::: 'Null 'PGint4, "c" ::: 'Null 'PGint4])]]

874+-- '[ "public" ::: '["abc" ::: 'Table ('[] :=> '["a" ::: 'NoDef :=> 'Null 'PGint4, "b" ::: 'NoDef :=> 'Null 'PGint4, "c" ::: 'NoDef :=> 'Null 'PGint4])]]

875+-- definition = dropView #bc

876+-- in printSQL definition

877+-- :}

878+-- DROP VIEW "bc";

879+dropView

880+ :: (Has sch schemas schema, Has vw schema ('View view))

881+ => QualifiedAlias sch vw -- ^ view to remove

882+ -> Definition schemas (Alter sch (Drop vw schema) schemas)

883+dropView vw = UnsafeDefinition $ "DROP VIEW" <+> renderSQL vw <> ";"

884+

885+-- | Enumerated types are created using the `createTypeEnum` command, for example

886+--

887+-- >>> printSQL $ (createTypeEnum #mood (label @"sad" :* label @"ok" :* label @"happy") :: Definition (Public '[]) '["public" ::: '["mood" ::: 'Typedef ('PGenum '["sad","ok","happy"])]])

888+-- CREATE TYPE "mood" AS ENUM ('sad', 'ok', 'happy');

889+createTypeEnum

890+ :: (KnownSymbol enum, Has sch schemas schema, SOP.All KnownSymbol labels)

891+ => QualifiedAlias sch enum

892+ -- ^ name of the user defined enumerated type

893+ -> NP PGlabel labels

894+ -- ^ labels of the enumerated type

895+ -> Definition schemas (Alter sch (Create enum ('Typedef ('PGenum labels)) schema) schemas)

896+createTypeEnum enum labels = UnsafeDefinition $

897+ "CREATE" <+> "TYPE" <+> renderSQL enum <+> "AS" <+> "ENUM" <+>

898+ parenthesized (renderSQL labels) <> ";"

899+

900+-- | Enumerated types can also be generated from a Haskell type, for example

901+--

902+-- >>> data Schwarma = Beef | Lamb | Chicken deriving GHC.Generic

903+-- >>> instance SOP.Generic Schwarma

904+-- >>> instance SOP.HasDatatypeInfo Schwarma

905+-- >>> :{

906+-- let

907+-- createSchwarma :: Definition (Public '[]) '["public" ::: '["schwarma" ::: 'Typedef (PG (Enumerated Schwarma))]]

908+-- createSchwarma = createTypeEnumFrom @Schwarma #schwarma

909+-- in

910+-- printSQL createSchwarma

911+-- :}

912+-- CREATE TYPE "schwarma" AS ENUM ('Beef', 'Lamb', 'Chicken');

913+createTypeEnumFrom

914+ :: forall hask sch enum schemas schema.

915+ ( SOP.Generic hask

916+ , SOP.All KnownSymbol (LabelsPG hask)

917+ , KnownSymbol enum

918+ , Has sch schemas schema )

919+ => QualifiedAlias sch enum

920+ -- ^ name of the user defined enumerated type

921+ -> Definition schemas (Alter sch (Create enum ('Typedef (PG (Enumerated hask))) schema) schemas)

922+createTypeEnumFrom enum = createTypeEnum enum

923+ (SOP.hpure label :: NP PGlabel (LabelsPG hask))

924+

925+{- | `createTypeComposite` creates a composite type. The composite type is

926+specified by a list of attribute names and data types.

927+

928+>>> :{

929+type PGcomplex = 'PGcomposite

930+ '[ "real" ::: 'NotNull 'PGfloat8

931+ , "imaginary" ::: 'NotNull 'PGfloat8 ]

932+:}

933+

934+>>> :{

935+let

936+ setup :: Definition (Public '[]) '["public" ::: '["complex" ::: 'Typedef PGcomplex]]

937+ setup = createTypeComposite #complex

938+ (float8 `as` #real :* float8 `as` #imaginary)

939+in printSQL setup

940+:}

941+CREATE TYPE "complex" AS ("real" float8, "imaginary" float8);

942+-}

943+createTypeComposite

944+ :: (KnownSymbol ty, Has sch schemas schema, SOP.SListI fields)

945+ => QualifiedAlias sch ty

946+ -- ^ name of the user defined composite type

947+ -> NP (Aliased (TypeExpression schemas)) fields

948+ -- ^ list of attribute names and data types

949+ -> Definition schemas (Alter sch (Create ty ('Typedef ('PGcomposite fields)) schema) schemas)

950+createTypeComposite ty fields = UnsafeDefinition $

951+ "CREATE" <+> "TYPE" <+> renderSQL ty <+> "AS" <+> parenthesized

952+ (renderCommaSeparated renderField fields) <> ";"

953+ where

954+ renderField :: Aliased (TypeExpression schemas) x -> ByteString

955+ renderField (typ `As` alias) =

956+ renderSQL alias <+> renderSQL typ

957+

958+-- | Composite types can also be generated from a Haskell type, for example

959+--

960+-- >>> data Complex = Complex {real :: Double, imaginary :: Double} deriving GHC.Generic

961+-- >>> instance SOP.Generic Complex

962+-- >>> instance SOP.HasDatatypeInfo Complex

963+-- >>> type Schema = '["complex" ::: 'Typedef (PG (Composite Complex))]

964+-- >>> :{

965+-- let

966+-- createComplex :: Definition (Public '[]) (Public Schema)

967+-- createComplex = createTypeCompositeFrom @Complex #complex

968+-- in

969+-- printSQL createComplex

970+-- :}

971+-- CREATE TYPE "complex" AS ("real" float8, "imaginary" float8);

972+createTypeCompositeFrom

973+ :: forall hask sch ty schemas schema.

974+ ( SOP.All (FieldTyped schemas) (RowPG hask)

975+ , KnownSymbol ty

976+ , Has sch schemas schema )

977+ => QualifiedAlias sch ty

978+ -- ^ name of the user defined composite type

979+ -> Definition schemas (Alter sch (Create ty ( 'Typedef (PG (Composite hask))) schema) schemas)

980+createTypeCompositeFrom ty = createTypeComposite ty

981+ (SOP.hcpure (SOP.Proxy :: SOP.Proxy (FieldTyped schemas)) fieldtype

982+ :: NP (Aliased (TypeExpression schemas)) (RowPG hask))

983+

984+{-|

985+`createDomain` creates a new domain. A domain is essentially a data type

986+with constraints (restrictions on the allowed set of values).

987+

988+Domains are useful for abstracting common constraints on fields

989+into a single location for maintenance. For example, several tables might

990+contain email address columns, all requiring the same `check` constraint

991+to verify the address syntax. Define a domain rather than setting up

992+each table's constraint individually.

993+

994+>>> :{

995+let

996+ createPositive :: Definition (Public '[]) (Public '["positive" ::: 'Typedef 'PGfloat4])

997+ createPositive = createDomain #positive real (#value .> 0 .&& (#value & isNotNull))

998+in printSQL createPositive

999+:}

1000+CREATE DOMAIN "positive" AS real CHECK ((("value" > 0) AND "value" IS NOT NULL));

1001+-}

1002+createDomain

1003+ :: (Has sch schemas schema, KnownSymbol dom)

1004+ => QualifiedAlias sch dom

1005+ -> (forall nullity. TypeExpression schemas (nullity ty))

1006+ -> (forall tab. Condition '[] 'Ungrouped '[] schemas '[] '[tab ::: '["value" ::: 'Null ty]])

1007+ -> Definition schemas (Alter sch (Create alias ('Typedef ty) schema) schemas)

1008+createDomain dom ty condition =

1009+ UnsafeDefinition $ "CREATE DOMAIN" <+> renderSQL dom

1010+ <+> "AS" <+> renderTypeExpression ty

1011+ <+> "CHECK" <+> parenthesized (renderSQL condition) <> ";"

1012+

1013+class FieldTyped schemas ty where

1014+ fieldtype :: Aliased (TypeExpression schemas) ty

1015+instance (KnownSymbol alias, PGTyped schemas ty)

1016+ => FieldTyped schemas (alias ::: ty) where

1017+ fieldtype = pgtype `As` Alias

1018+

1019+-- | Drop a type.

1020+--

1021+-- >>> data Schwarma = Beef | Lamb | Chicken deriving GHC.Generic

1022+-- >>> instance SOP.Generic Schwarma

1023+-- >>> instance SOP.HasDatatypeInfo Schwarma

1024+-- >>> printSQL (dropType #schwarma :: Definition '["public" ::: '["schwarma" ::: 'Typedef (PG (Enumerated Schwarma))]] (Public '[]))

1025+-- DROP TYPE "schwarma";

1026+dropType

1027+ :: (Has sch schemas schema, Has td schema ('Typedef ty))

1028+ => QualifiedAlias sch td

1029+ -- ^ name of the user defined type

1030+ -> Definition schemas (Alter sch (Drop td schema) schemas)

1031+dropType tydef = UnsafeDefinition $ "DROP" <+> "TYPE" <+> renderSQL tydef <> ";"

1032+

1033+-- | `ColumnTypeExpression`s are used in `createTable` commands.

1034+newtype ColumnTypeExpression (schemas :: SchemasType) (ty :: ColumnType)

1035+ = UnsafeColumnTypeExpression { renderColumnTypeExpression :: ByteString }

1036+ deriving (GHC.Generic,Show,Eq,Ord,NFData)

1037+instance RenderSQL (ColumnTypeExpression schemas ty) where

1038+ renderSQL = renderColumnTypeExpression

1039+

1040+-- | used in `createTable` commands as a column constraint to note that

1041+-- @NULL@ may be present in a column

1042+nullable

1043+ :: TypeExpression schemas (nullity ty)

1044+ -> ColumnTypeExpression schemas ('NoDef :=> 'Null ty)

1045+nullable ty = UnsafeColumnTypeExpression $ renderSQL ty <+> "NULL"

1046+

1047+-- | used in `createTable` commands as a column constraint to ensure

1048+-- @NULL@ is not present in a column

1049+notNullable

1050+ :: TypeExpression schemas (nullity ty)

1051+ -> ColumnTypeExpression schemas ('NoDef :=> 'NotNull ty)

1052+notNullable ty = UnsafeColumnTypeExpression $ renderSQL ty <+> "NOT NULL"

1053+

1054+-- | used in `createTable` commands as a column constraint to give a default

1055+default_

1056+ :: Expression '[] 'Ungrouped '[] schemas '[] '[] ty

1057+ -> ColumnTypeExpression schemas ('NoDef :=> ty)

1058+ -> ColumnTypeExpression schemas ('Def :=> ty)

1059+default_ x ty = UnsafeColumnTypeExpression $

1060+ renderSQL ty <+> "DEFAULT" <+> renderExpression x

1061+

1062+-- | not a true type, but merely a notational convenience for creating

1063+-- unique identifier columns with type `PGint2`

1064+serial2, smallserial

1065+ :: ColumnTypeExpression schemas ('Def :=> 'NotNull 'PGint2)

1066+serial2 = UnsafeColumnTypeExpression "serial2"

1067+smallserial = UnsafeColumnTypeExpression "smallserial"

1068+-- | not a true type, but merely a notational convenience for creating

1069+-- unique identifier columns with type `PGint4`

1070+serial4, serial

1071+ :: ColumnTypeExpression schemas ('Def :=> 'NotNull 'PGint4)

1072+serial4 = UnsafeColumnTypeExpression "serial4"

1073+serial = UnsafeColumnTypeExpression "serial"

1074+-- | not a true type, but merely a notational convenience for creating

1075+-- unique identifier columns with type `PGint8`

1076+serial8, bigserial

1077+ :: ColumnTypeExpression schemas ('Def :=> 'NotNull 'PGint8)

1078+serial8 = UnsafeColumnTypeExpression "serial8"

1079+bigserial = UnsafeColumnTypeExpression "bigserial"

squeal-postgresql/src/Squeal/PostgreSQL/Definition/Function.hsdeleted−238

@@ -1,238 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Definition.Function

3−Description: Create and drop function and operator definitions

4−Copyright: (c) Eitan Chatav, 2017

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Create and drop function and operator definitions.

9−-}

10−

11−{-# LANGUAGE

12− AllowAmbiguousTypes

13− , ConstraintKinds

14− , DeriveAnyClass

15− , DeriveGeneric

16− , DerivingStrategies

17− , FlexibleContexts

18− , FlexibleInstances

19− , GADTs

20− , LambdaCase

21− , MultiParamTypeClasses

22− , OverloadedLabels

23− , OverloadedStrings

24− , RankNTypes

25− , ScopedTypeVariables

26− , TypeApplications

27− , TypeInType

28− , TypeOperators

29− , UndecidableSuperClasses

30−#-}

31−

32−module Squeal.PostgreSQL.Definition.Function

33− ( createFunction

34− , createOrReplaceFunction

35− , createSetFunction

36− , createOrReplaceSetFunction

37− , createBinaryOp

38− , createLeftOp

39− , createRightOp

40− , dropFunction

41− , dropFunctionIfExists

42− , dropOperator

43− , dropOperatorIfExists

44− , FunctionDefinition(..)

45− , languageSqlExpr

46− , languageSqlQuery

47− ) where

48−

49−import Control.DeepSeq

50−import Data.ByteString

51−import GHC.TypeLits

52−

53−import qualified Generics.SOP as SOP

54−import qualified GHC.Generics as GHC

55−

56−import Squeal.PostgreSQL.Alias

57−import Squeal.PostgreSQL.Definition

58−import Squeal.PostgreSQL.Expression

59−import Squeal.PostgreSQL.Expression.Type

60−import Squeal.PostgreSQL.List

61−import Squeal.PostgreSQL.Query

62−import Squeal.PostgreSQL.Render

63−import Squeal.PostgreSQL.Schema

64−

65−-- $setup

66−-- >>> import Squeal.PostgreSQL

67−

68−createFunction

69− :: ( Has sch schemas schema

70− , KnownSymbol fun

71− , SOP.SListI args )

72− => QualifiedAlias sch fun

73− -> NP (TypeExpression schemas) args

74− -> TypeExpression schemas ret

75− -> FunctionDefinition schemas args ('Returns ret)

76− -> Definition schemas (Alter sch (Create fun ('Function (args :=> 'Returns ret)) schema) schemas)

77−createFunction fun args ret fundef = UnsafeDefinition $

78− "CREATE" <+> "FUNCTION" <+> renderSQL fun

79− <+> parenthesized (renderCommaSeparated renderSQL args)

80− <+> "RETURNS" <+> renderSQL ret <+> renderSQL fundef <> ";"

81−

82−createOrReplaceFunction

83− :: ( Has sch schemas schema

84− , KnownSymbol fun

85− , SOP.SListI args )

86− => QualifiedAlias sch fun

87− -> NP (TypeExpression schemas) args

88− -> TypeExpression schemas ret

89− -> FunctionDefinition schemas args ('Returns ret)

90− -> Definition schemas (Alter sch (CreateOrReplace fun ('Function (args :=> 'Returns ret)) schema) schemas)

91−createOrReplaceFunction fun args ret fundef = UnsafeDefinition $

92− "CREATE" <+> "OR" <+> "REPLACE" <+> "FUNCTION" <+> renderSQL fun

93− <+> parenthesized (renderCommaSeparated renderSQL args)

94− <+> "RETURNS" <+> renderSQL ret <+> renderSQL fundef <> ";"

95−

96−languageSqlExpr

97− :: Expression '[] '[] 'Ungrouped schemas args '[] ret

98− -> FunctionDefinition schemas args ('Returns ret)

99−languageSqlExpr expr = UnsafeFunctionDefinition $

100− "language sql as"

101− <+> "$$" <+> renderSQL (values_ (expr `as` #ret)) <+> "$$"

102−

103−languageSqlQuery

104− :: Query '[] '[] schemas args rets

105− -> FunctionDefinition schemas args ('ReturnsTable rets)

106−languageSqlQuery qry = UnsafeFunctionDefinition $

107− "language sql as" <+> "$$" <+> renderSQL qry <+> "$$"

108−

109−createSetFunction

110− :: ( Has sch schemas schema

111− , KnownSymbol fun

112− , SOP.SListI args

113− , SOP.SListI rets )

114− => QualifiedAlias sch fun

115− -> NP (TypeExpression schemas) args

116− -> NP (Aliased (TypeExpression schemas)) rets

117− -> FunctionDefinition schemas args ('ReturnsTable rets)

118− -> Definition schemas (Alter sch (Create fun ('Function (args :=> 'ReturnsTable rets)) schema) schemas)

119−createSetFunction fun args rets fundef = UnsafeDefinition $

120− "CREATE" <+> "FUNCTION" <+> renderSQL fun

121− <+> parenthesized (renderCommaSeparated renderSQL args)

122− <+> "RETURNS" <+> "TABLE"

123− <+> parenthesized (renderCommaSeparated renderRet rets)

124− <+> renderSQL fundef <> ";"

125− where

126− renderRet :: Aliased (TypeExpression s) r -> ByteString

127− renderRet (ty `As` col) = renderSQL col <+> renderSQL ty

128−

129−createOrReplaceSetFunction

130− :: ( Has sch schemas schema

131− , KnownSymbol fun

132− , SOP.SListI args

133− , SOP.SListI rets )

134− => QualifiedAlias sch fun

135− -> NP (TypeExpression schemas) args

136− -> NP (Aliased (TypeExpression schemas)) rets

137− -> FunctionDefinition schemas args ('ReturnsTable rets)

138− -> Definition schemas (Alter sch (CreateOrReplace fun ('Function (args :=> 'ReturnsTable rets)) schema) schemas)

139−createOrReplaceSetFunction fun args rets fundef = UnsafeDefinition $

140− "CREATE" <+> "OR" <+> "REPLACE" <+> "FUNCTION" <+> renderSQL fun

141− <+> parenthesized (renderCommaSeparated renderSQL args)

142− <+> "RETURNS" <+> "TABLE"

143− <+> parenthesized (renderCommaSeparated renderRet rets)

144− <+> renderSQL fundef <> ";"

145− where

146− renderRet :: Aliased (TypeExpression s) r -> ByteString

147− renderRet (ty `As` col) = renderSQL col <+> renderSQL ty

148−

149−createBinaryOp

150− :: forall op fun sch schemas schema x y z.

151− ( Has sch schemas schema

152− , Has fun schema ('Function ('[x,y] :=> 'Returns z))

153− , KnownSymbol op )

154− => QualifiedAlias sch fun

155− -> TypeExpression schemas x

156− -> TypeExpression schemas y

157− -> Definition schemas

158− (Alter sch (Create op ('Operator ('BinaryOp x y z)) schema) schemas)

159−createBinaryOp fun x y = UnsafeDefinition $

160− "CREATE" <+> "OPERATOR" <+> renderSymbol @op

161− <+> parenthesized (commaSeparated opdef)

162− where

163− opdef =

164− [ "FUNCTION" <+> "=" <+> renderSQL fun

165− , "LEFTARG" <+> "=" <+> renderSQL x

166− , "RIGHTARG" <+> "=" <+> renderSQL y ]

167−

168−createLeftOp

169− :: forall op fun sch schemas schema x y.

170− ( Has sch schemas schema

171− , Has fun schema ('Function ('[x] :=> 'Returns y))

172− , KnownSymbol op )

173− => QualifiedAlias sch fun

174− -> TypeExpression schemas x

175− -> Definition schemas

176− (Alter sch (Create op ('Operator ('LeftOp x y)) schema) schemas)

177−createLeftOp fun x = UnsafeDefinition $

178− "CREATE" <+> "OPERATOR" <+> renderSymbol @op

179− <+> parenthesized (commaSeparated opdef)

180− where

181− opdef =

182− [ "FUNCTION" <+> "=" <+> renderSQL fun

183− , "RIGHTARG" <+> "=" <+> renderSQL x ]

184−

185−createRightOp

186− :: forall op fun sch schemas schema x y.

187− ( Has sch schemas schema

188− , Has fun schema ('Function ('[x] :=> 'Returns y))

189− , KnownSymbol op )

190− => QualifiedAlias sch fun

191− -> TypeExpression schemas x

192− -> Definition schemas

193− (Alter sch (Create op ('Operator ('RightOp x y)) schema) schemas)

194−createRightOp fun x = UnsafeDefinition $

195− "CREATE" <+> "OPERATOR" <+> renderSymbol @op

196− <+> parenthesized (commaSeparated opdef)

197− where

198− opdef =

199− [ "FUNCTION" <+> "=" <+> renderSQL fun

200− , "LEFTARG" <+> "=" <+> renderSQL x ]

201−

202−dropFunction

203− :: (Has sch schemas schema, KnownSymbol fun)

204− => QualifiedAlias sch fun

205− -- ^ name of the user defined function

206− -> Definition schemas (Alter sch (DropSchemum fun 'Function schema) schemas)

207−dropFunction fun = UnsafeDefinition $

208− "DROP" <+> "FUNCTION" <+> renderSQL fun <> ";"

209−

210−dropFunctionIfExists

211− :: (Has sch schemas schema, KnownSymbol fun)

212− => QualifiedAlias sch fun

213− -- ^ name of the user defined function

214− -> Definition schemas (Alter sch (DropSchemumIfExists fun 'Function schema) schemas)

215−dropFunctionIfExists fun = UnsafeDefinition $

216− "DROP FUNCTION IF EXISTS" <+> renderSQL fun <> ";"

217−

218−dropOperator

219− :: (Has sch schemas schema, KnownSymbol op)

220− => QualifiedAlias sch op

221− -- ^ name of the user defined operator

222− -> Definition schemas (Alter sch (DropSchemum op 'Operator schema) schemas)

223−dropOperator op = UnsafeDefinition $

224− "DROP" <+> "OPERATOR" <+> renderSQL op <> ";"

225−

226−dropOperatorIfExists

227− :: (Has sch schemas schema, KnownSymbol op)

228− => QualifiedAlias sch op

229− -- ^ name of the user defined operator

230− -> Definition schemas (Alter sch (DropSchemumIfExists op 'Operator schema) schemas)

231−dropOperatorIfExists op = UnsafeDefinition $

232− "DROP OPERATOR IF EXISTS" <+> renderSQL op <> ";"

233−

234−newtype FunctionDefinition schemas args ret = UnsafeFunctionDefinition

235− { renderFunctionDefinition :: ByteString }

236− deriving (Eq,Show,GHC.Generic,NFData)

237−instance RenderSQL (FunctionDefinition schemas args ret) where

238− renderSQL = renderFunctionDefinition

squeal-postgresql/src/Squeal/PostgreSQL/Definition/Index.hsdeleted−159

@@ -1,159 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Definition.Index

3−Description: Create and drop index definitions

4−Copyright: (c) Eitan Chatav, 2017

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Create and drop index definitions.

9−-}

10−

11−{-# LANGUAGE

12− AllowAmbiguousTypes

13− , ConstraintKinds

14− , DeriveAnyClass

15− , DeriveGeneric

16− , DerivingStrategies

17− , FlexibleContexts

18− , FlexibleInstances

19− , GADTs

20− , LambdaCase

21− , MultiParamTypeClasses

22− , OverloadedLabels

23− , OverloadedStrings

24− , RankNTypes

25− , ScopedTypeVariables

26− , TypeApplications

27− , TypeInType

28− , TypeOperators

29− , UndecidableSuperClasses

30−#-}

31−

32−module Squeal.PostgreSQL.Definition.Index

33− ( createIndex

34− , createIndexIfNotExists

35− , dropIndex

36− , dropIndexIfExists

37− , IndexMethod (..)

38− , btree

39− , hash

40− , gist

41− , spgist

42− , gin

43− , brin

44− ) where

45−

46−import Data.ByteString

47−import GHC.TypeLits

48−

49−import qualified GHC.Generics as GHC

50−

51−import Squeal.PostgreSQL.Alias

52−import Squeal.PostgreSQL.Definition

53−import Squeal.PostgreSQL.Expression.Sort

54−import Squeal.PostgreSQL.Render

55−import Squeal.PostgreSQL.Schema

56−

57−-- $setup

58−-- >>> import Squeal.PostgreSQL

59−

60−{- |

61−>>> :{

62−type Table = '[] :=>

63− '[ "a" ::: 'NoDef :=> 'Null 'PGint4

64− , "b" ::: 'NoDef :=> 'Null 'PGfloat4 ]

65−:}

66−

67−>>> :{

68−let

69− setup :: Definition (Public '[]) (Public '["tab" ::: 'Table Table, "ix" ::: 'Index 'Btree])

70− setup =

71− createTable #tab (nullable int `as` #a :* nullable real `as` #b) Nil >>>

72− createIndex #ix #tab btree [#a & AscNullsFirst, #b & AscNullsLast]

73−in printSQL setup

74−:}

75−CREATE TABLE "tab" ("a" int NULL, "b" real NULL);

76−CREATE INDEX "ix" ON "tab" USING btree (("a") ASC NULLS FIRST, ("b") ASC NULLS LAST);

77−-}

78−createIndex

79− :: (Has sch schemas schema, Has tab schema ('Table table), KnownSymbol ix)

80− => Alias ix

81− -> QualifiedAlias sch tab

82− -> IndexMethod method

83− -> [SortExpression '[] '[] 'Ungrouped schemas '[] '[tab ::: TableToRow table]]

84− -> Definition schemas (Alter sch (Create ix ('Index method) schema) schemas)

85−createIndex ix tab method cols = UnsafeDefinition $

86− "CREATE" <+> "INDEX" <+> renderSQL ix <+> "ON" <+> renderSQL tab

87− <+> "USING" <+> renderSQL method

88− <+> parenthesized (commaSeparated (renderIndex <$> cols))

89− <> ";"

90− where

91− renderIndex = \case

92− Asc expression -> parenthesized (renderSQL expression) <+> "ASC"

93− Desc expression -> parenthesized (renderSQL expression) <+> "DESC"

94− AscNullsFirst expression -> parenthesized (renderSQL expression)

95− <+> "ASC NULLS FIRST"

96− DescNullsFirst expression -> parenthesized (renderSQL expression)

97− <+> "DESC NULLS FIRST"

98− AscNullsLast expression -> parenthesized (renderSQL expression)

99− <+> "ASC NULLS LAST"

100− DescNullsLast expression -> parenthesized (renderSQL expression)

101− <+> "DESC NULLS LAST"

102−

103−createIndexIfNotExists

104− :: (Has sch schemas schema, Has tab schema ('Table table), KnownSymbol ix)

105− => Alias ix

106− -> QualifiedAlias sch tab

107− -> IndexMethod method

108− -> [SortExpression '[] '[] 'Ungrouped schemas '[] '[tab ::: TableToRow table]]

109− -> Definition schemas (Alter sch (CreateIfNotExists ix ('Index method) schema) schemas)

110−createIndexIfNotExists ix tab method cols = UnsafeDefinition $

111− "CREATE INDEX IF NOT EXISTS" <+> renderSQL ix <+> "ON" <+> renderSQL tab

112− <+> "USING" <+> renderSQL method

113− <+> parenthesized (commaSeparated (renderIndex <$> cols))

114− <> ";"

115− where

116− renderIndex = \case

117− Asc expression -> parenthesized (renderSQL expression) <+> "ASC"

118− Desc expression -> parenthesized (renderSQL expression) <+> "DESC"

119− AscNullsFirst expression -> parenthesized (renderSQL expression)

120− <+> "ASC NULLS FIRST"

121− DescNullsFirst expression -> parenthesized (renderSQL expression)

122− <+> "DESC NULLS FIRST"

123− AscNullsLast expression -> parenthesized (renderSQL expression)

124− <+> "ASC NULLS LAST"

125− DescNullsLast expression -> parenthesized (renderSQL expression)

126− <+> "DESC NULLS LAST"

127−

128−newtype IndexMethod ty = UnsafeIndexMethod {renderIndexMethod :: ByteString}

129− deriving stock (Eq, Ord, Show, GHC.Generic)

130−instance RenderSQL (IndexMethod ty) where renderSQL = renderIndexMethod

131−btree :: IndexMethod 'Btree

132−btree = UnsafeIndexMethod "btree"

133−hash :: IndexMethod 'Hash

134−hash = UnsafeIndexMethod "hash"

135−gist :: IndexMethod 'Gist

136−gist = UnsafeIndexMethod "gist"

137−spgist :: IndexMethod 'Spgist

138−spgist = UnsafeIndexMethod "spgist"

139−gin :: IndexMethod 'Gin

140−gin = UnsafeIndexMethod "gin"

141−brin :: IndexMethod 'Brin

142−brin = UnsafeIndexMethod "brin"

143−

144−-- |

145−-- >>> printSQL (dropIndex #ix :: Definition (Public '["ix" ::: 'Index 'Btree]) (Public '[]))

146−-- DROP INDEX "ix";

147−dropIndex

148− :: (Has sch schemas schema, KnownSymbol ix)

149− => QualifiedAlias sch ix

150− -- ^ name of the user defined index

151− -> Definition schemas (Alter sch (DropSchemum ix 'Index schema) schemas)

152−dropIndex ix = UnsafeDefinition $ "DROP" <+> "INDEX" <+> renderSQL ix <> ";"

153−

154−dropIndexIfExists

155− :: (Has sch schemas schema, KnownSymbol ix)

156− => QualifiedAlias sch ix

157− -- ^ name of the user defined index

158− -> Definition schemas (Alter sch (DropSchemumIfExists ix 'Index schema) schemas)

159−dropIndexIfExists ix = UnsafeDefinition $ "DROP INDEX IF EXISTS" <+> renderSQL ix <> ";"

squeal-postgresql/src/Squeal/PostgreSQL/Definition/Schema.hsdeleted−96

@@ -1,96 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Definition.Schema

3−Description: Create and drop schema definitions

4−Copyright: (c) Eitan Chatav, 2017

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Create and drop schema definitions.

9−-}

10−

11−{-# LANGUAGE

12− AllowAmbiguousTypes

13− , ConstraintKinds

14− , DeriveAnyClass

15− , DeriveGeneric

16− , DerivingStrategies

17− , FlexibleContexts

18− , FlexibleInstances

19− , GADTs

20− , LambdaCase

21− , MultiParamTypeClasses

22− , OverloadedLabels

23− , OverloadedStrings

24− , RankNTypes

25− , ScopedTypeVariables

26− , TypeApplications

27− , TypeInType

28− , TypeOperators

29− , UndecidableSuperClasses

30−#-}

31−

32−module Squeal.PostgreSQL.Definition.Schema

33− ( createSchema

34− , createSchemaIfNotExists

35− , dropSchema

36− , dropSchemaIfExists

37− ) where

38−

39−import GHC.TypeLits

40−

41−import Squeal.PostgreSQL.Alias

42−import Squeal.PostgreSQL.Definition

43−import Squeal.PostgreSQL.Render

44−import Squeal.PostgreSQL.Schema

45−

46−-- $setup

47−-- >>> import Squeal.PostgreSQL

48−

49−{- |

50−`createSchema` enters a new schema into the current database.

51−The schema name must be distinct from the name of any existing schema

52−in the current database.

53−

54−A schema is essentially a namespace: it contains named objects

55−(tables, data types, functions, and operators) whose names

56−can duplicate those of other objects existing in other schemas.

57−Named objects are accessed by `QualifiedAlias`es with the schema

58−name as a prefix.

59−-}

60−createSchema

61− :: KnownSymbol sch

62− => Alias sch

63− -> Definition schemas (Create sch '[] schemas)

64−createSchema sch = UnsafeDefinition $

65− "CREATE" <+> "SCHEMA" <+> renderSQL sch <> ";"

66−

67−{- | Idempotent version of `createSchema`. -}

68−createSchemaIfNotExists

69− :: (KnownSymbol sch, Has sch schemas schema)

70− => Alias sch

71− -> Definition schemas (CreateIfNotExists sch '[] schemas)

72−createSchemaIfNotExists sch = UnsafeDefinition $

73− "CREATE" <+> "SCHEMA" <+> "IF" <+> "NOT" <+> "EXISTS"

74− <+> renderSQL sch <> ";"

75−

76−-- | >>> :{

77−-- let

78−-- definition :: Definition '["muh_schema" ::: schema, "public" ::: public] '["public" ::: public]

79−-- definition = dropSchema #muh_schema

80−-- :}

81−--

82−-- >>> printSQL definition

83−-- DROP SCHEMA "muh_schema";

84−dropSchema

85− :: KnownSymbol sch

86− => Alias sch

87− -- ^ user defined schema

88− -> Definition schemas (Drop sch schemas)

89−dropSchema sch = UnsafeDefinition $ "DROP SCHEMA" <+> renderSQL sch <> ";"

90−

91−dropSchemaIfExists

92− :: KnownSymbol sch

93− => Alias sch

94− -- ^ user defined schema

95− -> Definition schemas (DropIfExists sch schemas)

96−dropSchemaIfExists sch = UnsafeDefinition $ "DROP SCHEMA" <+> renderSQL sch <> ";"

squeal-postgresql/src/Squeal/PostgreSQL/Definition/Table.hsdeleted−500

@@ -1,500 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Definition.Table

3−Description: Create, drop and alter table definitions

4−Copyright: (c) Eitan Chatav, 2017

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Create, drop and alter table definitions.

9−-}

10−

11−{-# LANGUAGE

12− AllowAmbiguousTypes

13− , ConstraintKinds

14− , DeriveAnyClass

15− , DeriveGeneric

16− , DerivingStrategies

17− , FlexibleContexts

18− , FlexibleInstances

19− , GADTs

20− , LambdaCase

21− , MultiParamTypeClasses

22− , OverloadedLabels

23− , OverloadedStrings

24− , RankNTypes

25− , ScopedTypeVariables

26− , TypeApplications

27− , TypeInType

28− , TypeOperators

29− , UndecidableSuperClasses

30−#-}

31−

32−module Squeal.PostgreSQL.Definition.Table

33− ( createTable

34− , createTableIfNotExists

35− , dropTable

36− , dropTableIfExists

37− , alterTable

38− , alterTableIfExists

39− , alterTableRename

40− , alterTableIfExistsRename

41− , AlterTable (..)

42− , addConstraint

43− , dropConstraint

44− , AddColumn (..)

45− , dropColumn

46− , renameColumn

47− , alterColumn

48− , AlterColumn (..)

49− , setDefault

50− , dropDefault

51− , setNotNull

52− , dropNotNull

53− , alterType

54− ) where

55−

56−import Control.DeepSeq

57−import Data.ByteString

58−import GHC.TypeLits

59−

60−import qualified Generics.SOP as SOP

61−import qualified GHC.Generics as GHC

62−

63−import Squeal.PostgreSQL.Alias

64−import Squeal.PostgreSQL.Definition

65−import Squeal.PostgreSQL.Definition.Table.Constraint

66−import Squeal.PostgreSQL.Expression

67−import Squeal.PostgreSQL.Expression.Type

68−import Squeal.PostgreSQL.List

69−import Squeal.PostgreSQL.Render

70−import Squeal.PostgreSQL.Schema

71−

72−-- $setup

73−-- >>> import Squeal.PostgreSQL

74−

75−{- | `createTable` adds a table to the schema.

76−

77−>>> :set -XOverloadedLabels

78−>>> :{

79−type Table = '[] :=>

80− '[ "a" ::: 'NoDef :=> 'Null 'PGint4

81− , "b" ::: 'NoDef :=> 'Null 'PGfloat4 ]

82−:}

83−

84−>>> :{

85−let

86− setup :: Definition (Public '[]) (Public '["tab" ::: 'Table Table])

87− setup = createTable #tab

88− (nullable int `as` #a :* nullable real `as` #b) Nil

89−in printSQL setup

90−:}

91−CREATE TABLE "tab" ("a" int NULL, "b" real NULL);

92−-}

93−createTable

94− :: ( KnownSymbol sch

95− , KnownSymbol tab

96− , columns ~ (col ': cols)

97− , SOP.SListI columns

98− , SOP.SListI constraints

99− , Has sch schemas0 schema0

100− , schemas1 ~ Alter sch (Create tab ('Table (constraints :=> columns)) schema0) schemas0 )

101− => QualifiedAlias sch tab -- ^ the name of the table to add

102− -> NP (Aliased (ColumnTypeExpression schemas0)) columns

103− -- ^ the names and datatype of each column

104− -> NP (Aliased (TableConstraintExpression sch tab schemas1)) constraints

105− -- ^ constraints that must hold for the table

106− -> Definition schemas0 schemas1

107−createTable tab columns constraints = UnsafeDefinition $

108− "CREATE TABLE" <+> renderCreation tab columns constraints

109−

110−{-| `createTableIfNotExists` creates a table if it doesn't exist, but does not add it to the schema.

111−Instead, the schema already has the table so if the table did not yet exist, the schema was wrong.

112−`createTableIfNotExists` fixes this. Interestingly, this property makes it an idempotent in

113−the `Category` of `Definition`s.

114−

115−>>> :set -XOverloadedLabels -XTypeApplications

116−>>> :{

117−type Table = '[] :=>

118− '[ "a" ::: 'NoDef :=> 'Null 'PGint4

119− , "b" ::: 'NoDef :=> 'Null 'PGfloat4 ]

120−:}

121−

122−>>> type Schemas = Public '["tab" ::: 'Table Table]

123−

124−>>> :{

125−let

126− setup :: Definition Schemas Schemas

127− setup = createTableIfNotExists #tab

128− (nullable int `as` #a :* nullable real `as` #b) Nil

129−in printSQL setup

130−:}

131−CREATE TABLE IF NOT EXISTS "tab" ("a" int NULL, "b" real NULL);

132−-}

133−createTableIfNotExists

134− :: ( KnownSymbol sch

135− , KnownSymbol tab

136− , columns ~ (col ': cols)

137− , SOP.SListI columns

138− , SOP.SListI constraints

139− , Has sch schemas0 schema0

140− , schemas1 ~ Alter sch (CreateIfNotExists tab ('Table (constraints :=> columns)) schema0) schemas0 )

141− => QualifiedAlias sch tab -- ^ the name of the table to add

142− -> NP (Aliased (ColumnTypeExpression schemas0)) columns

143− -- ^ the names and datatype of each column

144− -> NP (Aliased (TableConstraintExpression sch tab schemas1)) constraints

145− -- ^ constraints that must hold for the table

146− -> Definition schemas0 schemas1

147−createTableIfNotExists tab columns constraints = UnsafeDefinition $

148− "CREATE TABLE IF NOT EXISTS"

149− <+> renderCreation tab columns constraints

150−

151−-- helper function for `createTable` and `createTableIfNotExists`

152−renderCreation

153− :: ( KnownSymbol sch

154− , KnownSymbol tab

155− , SOP.SListI columns

156− , SOP.SListI constraints )

157− => QualifiedAlias sch tab -- ^ the name of the table to add

158− -> NP (Aliased (ColumnTypeExpression schemas0)) columns

159− -- ^ the names and datatype of each column

160− -> NP (Aliased (TableConstraintExpression sch tab schemas1)) constraints

161− -- ^ constraints that must hold for the table

162− -> ByteString

163−renderCreation tab columns constraints = renderSQL tab

164− <+> parenthesized

165− ( renderCommaSeparated renderColumnDef columns

166− <> ( case constraints of

167− Nil -> ""

168− _ -> ", " <>

169− renderCommaSeparated renderConstraint constraints ) )

170− <> ";"

171− where

172− renderColumnDef :: Aliased (ColumnTypeExpression schemas) x -> ByteString

173− renderColumnDef (ty `As` column) =

174− renderSQL column <+> renderColumnTypeExpression ty

175− renderConstraint

176− :: Aliased (TableConstraintExpression sch tab schemas) constraint

177− -> ByteString

178− renderConstraint (constraint `As` alias) =

179− "CONSTRAINT" <+> renderSQL alias <+> renderSQL constraint

180−

181−-- | `dropTable` removes a table from the schema.

182−--

183−-- >>> :{

184−-- let

185−-- definition :: Definition '["public" ::: '["muh_table" ::: 'Table t]] (Public '[])

186−-- definition = dropTable #muh_table

187−-- :}

188−--

189−-- >>> printSQL definition

190−-- DROP TABLE "muh_table";

191−dropTable

192− :: ( Has sch schemas schema

193− , KnownSymbol tab )

194− => QualifiedAlias sch tab -- ^ table to remove

195− -> Definition schemas (Alter sch (DropSchemum tab 'Table schema) schemas)

196−dropTable tab = UnsafeDefinition $ "DROP TABLE" <+> renderSQL tab <> ";"

197−

198−dropTableIfExists

199− :: ( Has sch schemas schema

200− , KnownSymbol tab)

201− => QualifiedAlias sch tab -- ^ table to remove

202− -> Definition schemas (Alter sch (DropSchemumIfExists tab 'Table schema) schemas)

203−dropTableIfExists tab = UnsafeDefinition $ "DROP TABLE IF EXISTS" <+> renderSQL tab <> ";"

204−

205−-- | `alterTable` changes the definition of a table from the schema.

206−alterTable

207− :: (Has sch schemas schema, KnownSymbol tab)

208− => QualifiedAlias sch tab -- ^ table to alter

209− -> AlterTable sch tab schemas table -- ^ alteration to perform

210− -> Definition schemas (Alter sch (Alter tab ('Table table) schema) schemas)

211−alterTable tab alteration = UnsafeDefinition $

212− "ALTER TABLE"

213− <+> renderSQL tab

214− <+> renderAlterTable alteration

215− <> ";"

216−

217−-- | `alterTable` changes the definition of a table from the schema.

218−alterTableIfExists

219− :: (Has sch schemas schema, KnownSymbol tab)

220− => QualifiedAlias sch tab -- ^ table to alter

221− -> AlterTable sch tab schemas table -- ^ alteration to perform

222− -> Definition schemas (Alter sch (AlterIfExists tab ('Table table) schema) schemas)

223−alterTableIfExists tab alteration = UnsafeDefinition $

224− "ALTER TABLE IF EXISTS"

225− <+> renderSQL tab

226− <+> renderAlterTable alteration

227− <> ";"

228−

229−-- | `alterTableRename` changes the name of a table from the schema.

230−--

231−-- >>> printSQL $ alterTableRename #foo #bar

232−-- ALTER TABLE "foo" RENAME TO "bar";

233−alterTableRename

234− :: (KnownSymbol tab0, KnownSymbol tab1)

235− => Alias tab0 -- ^ table to rename

236− -> Alias tab1 -- ^ what to rename it

237− -> Definition schema (Rename tab0 tab1 schema)

238−alterTableRename tab0 tab1 = UnsafeDefinition $

239− "ALTER TABLE" <+> renderSQL tab0

240− <+> "RENAME TO" <+> renderSQL tab1 <> ";"

241−

242−alterTableIfExistsRename

243− :: (KnownSymbol tab0, KnownSymbol tab1)

244− => Alias tab0 -- ^ table to rename

245− -> Alias tab1 -- ^ what to rename it

246− -> Definition schema (RenameIfExists tab0 tab1 schema)

247−alterTableIfExistsRename tab0 tab1 = UnsafeDefinition $

248− "ALTER TABLE IF EXISTS" <+> renderSQL tab0

249− <+> "RENAME TO" <+> renderSQL tab1 <> ";"

250−

251−-- | An `AlterTable` describes the alteration to perform on the columns

252−-- of a table.

253−newtype AlterTable

254− (sch :: Symbol)

255− (tab :: Symbol)

256− (schemas :: SchemasType)

257− (table :: TableType) =

258− UnsafeAlterTable {renderAlterTable :: ByteString}

259− deriving (GHC.Generic,Show,Eq,Ord,NFData)

260−

261−-- | An `addConstraint` adds a table constraint.

262−--

263−-- >>> :{

264−-- let

265−-- definition :: Definition

266−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

267−-- '["public" ::: '["tab" ::: 'Table ('["positive" ::: 'Check '["col"]] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

268−-- definition = alterTable #tab (addConstraint #positive (check #col (#col .> 0)))

269−-- in printSQL definition

270−-- :}

271−-- ALTER TABLE "tab" ADD CONSTRAINT "positive" CHECK (("col" > 0));

272−addConstraint

273− :: ( KnownSymbol alias

274− , Has sch schemas schema

275− , Has tab schema ('Table table0)

276− , table0 ~ (constraints :=> columns)

277− , table1 ~ (Create alias constraint constraints :=> columns) )

278− => Alias alias

279− -> TableConstraintExpression sch tab schemas constraint

280− -- ^ constraint to add

281− -> AlterTable sch tab schemas table1

282−addConstraint alias constraint = UnsafeAlterTable $

283− "ADD" <+> "CONSTRAINT" <+> renderSQL alias

284− <+> renderSQL constraint

285−

286−-- | A `dropConstraint` drops a table constraint.

287−--

288−-- >>> :{

289−-- let

290−-- definition :: Definition

291−-- '["public" ::: '["tab" ::: 'Table ('["positive" ::: Check '["col"]] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

292−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

293−-- definition = alterTable #tab (dropConstraint #positive)

294−-- in printSQL definition

295−-- :}

296−-- ALTER TABLE "tab" DROP CONSTRAINT "positive";

297−dropConstraint

298− :: ( KnownSymbol constraint

299− , Has sch schemas schema

300− , Has tab schema ('Table table0)

301− , table0 ~ (constraints :=> columns)

302− , table1 ~ (Drop constraint constraints :=> columns) )

303− => Alias constraint

304− -- ^ constraint to drop

305− -> AlterTable sch tab schemas table1

306−dropConstraint constraint = UnsafeAlterTable $

307− "DROP" <+> "CONSTRAINT" <+> renderSQL constraint

308−

309−-- | An `AddColumn` is either @NULL@ or has @DEFAULT@.

310−class AddColumn ty where

311− -- | `addColumn` adds a new column, initially filled with whatever

312− -- default value is given or with @NULL@.

313− --

314− -- >>> :{

315− -- let

316− -- definition :: Definition

317− -- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col1" ::: 'NoDef :=> 'Null 'PGint4])]]

318− -- '["public" ::: '["tab" ::: 'Table ('[] :=>

319− -- '[ "col1" ::: 'NoDef :=> 'Null 'PGint4

320− -- , "col2" ::: 'Def :=> 'Null 'PGtext ])]]

321− -- definition = alterTable #tab (addColumn #col2 (text & nullable & default_ "foo"))

322− -- in printSQL definition

323− -- :}

324− -- ALTER TABLE "tab" ADD COLUMN "col2" text NULL DEFAULT E'foo';

325− --

326− -- >>> :{

327− -- let

328− -- definition :: Definition

329− -- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col1" ::: 'NoDef :=> 'Null 'PGint4])]]

330− -- '["public" ::: '["tab" ::: 'Table ('[] :=>

331− -- '[ "col1" ::: 'NoDef :=> 'Null 'PGint4

332− -- , "col2" ::: 'NoDef :=> 'Null 'PGtext ])]]

333− -- definition = alterTable #tab (addColumn #col2 (text & nullable))

334− -- in printSQL definition

335− -- :}

336− -- ALTER TABLE "tab" ADD COLUMN "col2" text NULL;

337− addColumn

338− :: ( KnownSymbol column

339− , Has sch schemas schema

340− , Has tab schema ('Table table0)

341− , table0 ~ (constraints :=> columns) )

342− => Alias column -- ^ column to add

343− -> ColumnTypeExpression schemas ty -- ^ type of the new column

344− -> AlterTable sch tab schemas (constraints :=> Create column ty columns)

345− addColumn column ty = UnsafeAlterTable $

346− "ADD COLUMN" <+> renderSQL column <+> renderColumnTypeExpression ty

347−instance {-# OVERLAPPING #-} AddColumn ('Def :=> ty)

348−instance {-# OVERLAPPABLE #-} AddColumn ('NoDef :=> 'Null ty)

349−

350−-- | A `dropColumn` removes a column. Whatever data was in the column

351−-- disappears. Table constraints involving the column are dropped, too.

352−-- However, if the column is referenced by a foreign key constraint of

353−-- another table, PostgreSQL will not silently drop that constraint.

354−--

355−-- >>> :{

356−-- let

357−-- definition :: Definition

358−-- '["public" ::: '["tab" ::: 'Table ('[] :=>

359−-- '[ "col1" ::: 'NoDef :=> 'Null 'PGint4

360−-- , "col2" ::: 'NoDef :=> 'Null 'PGtext ])]]

361−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col1" ::: 'NoDef :=> 'Null 'PGint4])]]

362−-- definition = alterTable #tab (dropColumn #col2)

363−-- in printSQL definition

364−-- :}

365−-- ALTER TABLE "tab" DROP COLUMN "col2";

366−dropColumn

367− :: ( KnownSymbol column

368− , Has sch schemas schema

369− , Has tab schema ('Table table0)

370− , table0 ~ (constraints :=> columns)

371− , table1 ~ (constraints :=> Drop column columns) )

372− => Alias column -- ^ column to remove

373− -> AlterTable sch tab schemas table1

374−dropColumn column = UnsafeAlterTable $

375− "DROP COLUMN" <+> renderSQL column

376−

377−-- | A `renameColumn` renames a column.

378−--

379−-- >>> :{

380−-- let

381−-- definition :: Definition

382−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["foo" ::: 'NoDef :=> 'Null 'PGint4])]]

383−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["bar" ::: 'NoDef :=> 'Null 'PGint4])]]

384−-- definition = alterTable #tab (renameColumn #foo #bar)

385−-- in printSQL definition

386−-- :}

387−-- ALTER TABLE "tab" RENAME COLUMN "foo" TO "bar";

388−renameColumn

389− :: ( KnownSymbol column0

390− , KnownSymbol column1

391− , Has sch schemas schema

392− , Has tab schema ('Table table0)

393− , table0 ~ (constraints :=> columns)

394− , table1 ~ (constraints :=> Rename column0 column1 columns) )

395− => Alias column0 -- ^ column to rename

396− -> Alias column1 -- ^ what to rename the column

397− -> AlterTable sch tab schemas table1

398−renameColumn column0 column1 = UnsafeAlterTable $

399− "RENAME COLUMN" <+> renderSQL column0 <+> "TO" <+> renderSQL column1

400−

401−-- | An `alterColumn` alters a single column.

402−alterColumn

403− :: ( KnownSymbol column

404− , Has sch schemas schema

405− , Has tab schema ('Table table0)

406− , table0 ~ (constraints :=> columns)

407− , Has column columns ty0

408− , table1 ~ (constraints :=> Alter column ty1 columns))

409− => Alias column -- ^ column to alter

410− -> AlterColumn schemas ty0 ty1 -- ^ alteration to perform

411− -> AlterTable sch tab schemas table1

412−alterColumn column alteration = UnsafeAlterTable $

413− "ALTER COLUMN" <+> renderSQL column <+> renderAlterColumn alteration

414−

415−-- | An `AlterColumn` describes the alteration to perform on a single column.

416−newtype AlterColumn (schemas :: SchemasType) (ty0 :: ColumnType) (ty1 :: ColumnType) =

417− UnsafeAlterColumn {renderAlterColumn :: ByteString}

418− deriving (GHC.Generic,Show,Eq,Ord,NFData)

419−

420−-- | A `setDefault` sets a new default for a column. Note that this doesn't

421−-- affect any existing rows in the table, it just changes the default for

422−-- future insert and update commands.

423−--

424−-- >>> :{

425−-- let

426−-- definition :: Definition

427−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'Null 'PGint4])]]

428−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'Def :=> 'Null 'PGint4])]]

429−-- definition = alterTable #tab (alterColumn #col (setDefault 5))

430−-- in printSQL definition

431−-- :}

432−-- ALTER TABLE "tab" ALTER COLUMN "col" SET DEFAULT 5;

433−setDefault

434− :: Expression '[] '[] 'Ungrouped schemas '[] '[] ty -- ^ default value to set

435− -> AlterColumn schemas (constraint :=> ty) ('Def :=> ty)

436−setDefault expression = UnsafeAlterColumn $

437− "SET DEFAULT" <+> renderExpression expression

438−

439−-- | A `dropDefault` removes any default value for a column.

440−--

441−-- >>> :{

442−-- let

443−-- definition :: Definition

444−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'Def :=> 'Null 'PGint4])]]

445−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'Null 'PGint4])]]

446−-- definition = alterTable #tab (alterColumn #col dropDefault)

447−-- in printSQL definition

448−-- :}

449−-- ALTER TABLE "tab" ALTER COLUMN "col" DROP DEFAULT;

450−dropDefault :: AlterColumn schemas ('Def :=> ty) ('NoDef :=> ty)

451−dropDefault = UnsafeAlterColumn $ "DROP DEFAULT"

452−

453−-- | A `setNotNull` adds a @NOT NULL@ constraint to a column.

454−-- The constraint will be checked immediately, so the table data must satisfy

455−-- the constraint before it can be added.

456−--

457−-- >>> :{

458−-- let

459−-- definition :: Definition

460−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'Null 'PGint4])]]

461−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

462−-- definition = alterTable #tab (alterColumn #col setNotNull)

463−-- in printSQL definition

464−-- :}

465−-- ALTER TABLE "tab" ALTER COLUMN "col" SET NOT NULL;

466−setNotNull

467− :: AlterColumn schemas (constraint :=> 'Null ty) (constraint :=> 'NotNull ty)

468−setNotNull = UnsafeAlterColumn $ "SET NOT NULL"

469−

470−-- | A `dropNotNull` drops a @NOT NULL@ constraint from a column.

471−--

472−-- >>> :{

473−-- let

474−-- definition :: Definition

475−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

476−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'Null 'PGint4])]]

477−-- definition = alterTable #tab (alterColumn #col dropNotNull)

478−-- in printSQL definition

479−-- :}

480−-- ALTER TABLE "tab" ALTER COLUMN "col" DROP NOT NULL;

481−dropNotNull

482− :: AlterColumn schemas (constraint :=> 'NotNull ty) (constraint :=> 'Null ty)

483−dropNotNull = UnsafeAlterColumn $ "DROP NOT NULL"

484−

485−-- | An `alterType` converts a column to a different data type.

486−-- This will succeed only if each existing entry in the column can be

487−-- converted to the new type by an implicit cast.

488−--

489−-- >>> :{

490−-- let

491−-- definition :: Definition

492−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

493−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGnumeric])]]

494−-- definition =

495−-- alterTable #tab (alterColumn #col (alterType (numeric & notNullable)))

496−-- in printSQL definition

497−-- :}

498−-- ALTER TABLE "tab" ALTER COLUMN "col" TYPE numeric NOT NULL;

499−alterType :: ColumnTypeExpression schemas ty -> AlterColumn schemas ty0 ty

500−alterType ty = UnsafeAlterColumn $ "TYPE" <+> renderColumnTypeExpression ty

squeal-postgresql/src/Squeal/PostgreSQL/Definition/Table/Constraint.hsdeleted−339

@@ -1,339 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Definition.Table.Constraint

3−Description: Table constraint expressions

4−Copyright: (c) Eitan Chatav, 2017

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Table constraint expressions.

9−-}

10−

11−{-# LANGUAGE

12− AllowAmbiguousTypes

13− , ConstraintKinds

14− , DeriveAnyClass

15− , DeriveGeneric

16− , DerivingStrategies

17− , FlexibleContexts

18− , FlexibleInstances

19− , GADTs

20− , LambdaCase

21− , MultiParamTypeClasses

22− , OverloadedLabels

23− , OverloadedStrings

24− , RankNTypes

25− , ScopedTypeVariables

26− , TypeApplications

27− , TypeInType

28− , TypeOperators

29− , UndecidableSuperClasses

30−#-}

31−

32−module Squeal.PostgreSQL.Definition.Table.Constraint

33− ( TableConstraintExpression (..)

34− , check

35− , unique

36− , primaryKey

37− , foreignKey

38− , ForeignKeyed

39− , OnDeleteClause (..)

40− , OnUpdateClause (..)

41− ) where

42−

43−import Control.DeepSeq

44−import Data.ByteString

45−import GHC.TypeLits

46−

47−import qualified Generics.SOP as SOP

48−import qualified GHC.Generics as GHC

49−

50−import Squeal.PostgreSQL.Alias

51−import Squeal.PostgreSQL.Expression.Logic

52−import Squeal.PostgreSQL.List

53−import Squeal.PostgreSQL.Render

54−import Squeal.PostgreSQL.Schema

55−

56−-- $setup

57−-- >>> import Squeal.PostgreSQL

58−

59−-- | Data types are a way to limit the kind of data that can be stored in a

60−-- table. For many applications, however, the constraint they provide is

61−-- too coarse. For example, a column containing a product price should

62−-- probably only accept positive values. But there is no standard data type

63−-- that accepts only positive numbers. Another issue is that you might want

64−-- to constrain column data with respect to other columns or rows.

65−-- For example, in a table containing product information,

66−-- there should be only one row for each product number.

67−-- `TableConstraint`s give you as much control over the data in your tables

68−-- as you wish. If a user attempts to store data in a column that would

69−-- violate a constraint, an error is raised. This applies

70−-- even if the value came from the default value definition.

71−newtype TableConstraintExpression

72− (sch :: Symbol)

73− (tab :: Symbol)

74− (schemas :: SchemasType)

75− (constraint :: TableConstraint)

76− = UnsafeTableConstraintExpression

77− { renderTableConstraintExpression :: ByteString }

78− deriving (GHC.Generic,Show,Eq,Ord,NFData)

79−instance RenderSQL

80− (TableConstraintExpression sch tab schemas constraint) where

81− renderSQL = renderTableConstraintExpression

82−

83−{-| A `check` constraint is the most generic `TableConstraint` type.

84−It allows you to specify that the value in a certain column must satisfy

85−a Boolean (truth-value) expression.

86−

87−>>> :{

88−type Schema = '[

89− "tab" ::: 'Table ('[ "inequality" ::: 'Check '["a","b"]] :=> '[

90− "a" ::: 'NoDef :=> 'NotNull 'PGint4,

91− "b" ::: 'NoDef :=> 'NotNull 'PGint4

92− ])]

93−:}

94−

95−>>> :{

96−let

97− definition :: Definition (Public '[]) (Public Schema)

98− definition = createTable #tab

99− ( (int & notNullable) `as` #a :*

100− (int & notNullable) `as` #b )

101− ( check (#a :* #b) (#a .> #b) `as` #inequality )

102−:}

103−

104−>>> printSQL definition

105−CREATE TABLE "tab" ("a" int NOT NULL, "b" int NOT NULL, CONSTRAINT "inequality" CHECK (("a" > "b")));

106−-}

107−check

108− :: ( Has sch schemas schema

109− , Has tab schema ('Table table)

110− , HasAll aliases (TableToRow table) subcolumns )

111− => NP Alias aliases

112− -- ^ specify the subcolumns which are getting checked

113− -> (forall t. Condition '[] '[] 'Ungrouped schemas '[] '[t ::: subcolumns])

114− -- ^ a closed `Condition` on those subcolumns

115− -> TableConstraintExpression sch tab schemas ('Check aliases)

116−check _cols condition = UnsafeTableConstraintExpression $

117− "CHECK" <+> parenthesized (renderSQL condition)

118−

119−{-| A `unique` constraint ensure that the data contained in a column,

120−or a group of columns, is unique among all the rows in the table.

121−

122−>>> :{

123−type Schema = '[

124− "tab" ::: 'Table( '[ "uq_a_b" ::: 'Unique '["a","b"]] :=> '[

125− "a" ::: 'NoDef :=> 'Null 'PGint4,

126− "b" ::: 'NoDef :=> 'Null 'PGint4

127− ])]

128−:}

129−

130−>>> :{

131−let

132− definition :: Definition (Public '[]) (Public Schema)

133− definition = createTable #tab

134− ( (int & nullable) `as` #a :*

135− (int & nullable) `as` #b )

136− ( unique (#a :* #b) `as` #uq_a_b )

137−:}

138−

139−>>> printSQL definition

140−CREATE TABLE "tab" ("a" int NULL, "b" int NULL, CONSTRAINT "uq_a_b" UNIQUE ("a", "b"));

141−-}

142−unique

143− :: ( Has sch schemas schema

144− , Has tab schema('Table table)

145− , HasAll aliases (TableToRow table) subcolumns )

146− => NP Alias aliases

147− -- ^ specify subcolumns which together are unique for each row

148− -> TableConstraintExpression sch tab schemas ('Unique aliases)

149−unique columns = UnsafeTableConstraintExpression $

150− "UNIQUE" <+> parenthesized (renderSQL columns)

151−

152−{-| A `primaryKey` constraint indicates that a column, or group of columns,

153−can be used as a unique identifier for rows in the table.

154−This requires that the values be both unique and not null.

155−

156−>>> :{

157−type Schema = '[

158− "tab" ::: 'Table ('[ "pk_id" ::: 'PrimaryKey '["id"]] :=> '[

159− "id" ::: 'Def :=> 'NotNull 'PGint4,

160− "name" ::: 'NoDef :=> 'NotNull 'PGtext

161− ])]

162−:}

163−

164−>>> :{

165−let

166− definition :: Definition (Public '[]) (Public Schema)

167− definition = createTable #tab

168− ( serial `as` #id :*

169− (text & notNullable) `as` #name )

170− ( primaryKey #id `as` #pk_id )

171−:}

172−

173−>>> printSQL definition

174−CREATE TABLE "tab" ("id" serial, "name" text NOT NULL, CONSTRAINT "pk_id" PRIMARY KEY ("id"));

175−-}

176−primaryKey

177− :: ( Has sch schemas schema

178− , Has tab schema ('Table table)

179− , HasAll aliases (TableToColumns table) subcolumns

180− , AllNotNull subcolumns )

181− => NP Alias aliases

182− -- ^ specify the subcolumns which together form a primary key.

183− -> TableConstraintExpression sch tab schemas ('PrimaryKey aliases)

184−primaryKey columns = UnsafeTableConstraintExpression $

185− "PRIMARY KEY" <+> parenthesized (renderSQL columns)

186−

187−{-| A `foreignKey` specifies that the values in a column

188−(or a group of columns) must match the values appearing in some row of

189−another table. We say this maintains the referential integrity

190−between two related tables.

191−

192−>>> :{

193−type Schema =

194− '[ "users" ::: 'Table (

195− '[ "pk_users" ::: 'PrimaryKey '["id"] ] :=>

196− '[ "id" ::: 'Def :=> 'NotNull 'PGint4

197− , "name" ::: 'NoDef :=> 'NotNull 'PGtext

198− ])

199− , "emails" ::: 'Table (

200− '[ "pk_emails" ::: 'PrimaryKey '["id"]

201− , "fk_user_id" ::: 'ForeignKey '["user_id"] "users" '["id"]

202− ] :=>

203− '[ "id" ::: 'Def :=> 'NotNull 'PGint4

204− , "user_id" ::: 'NoDef :=> 'NotNull 'PGint4

205− , "email" ::: 'NoDef :=> 'Null 'PGtext

206− ])

207− ]

208−:}

209−

210−>>> :{

211−let

212− setup :: Definition (Public '[]) (Public Schema)

213− setup =

214− createTable #users

215− ( serial `as` #id :*

216− (text & notNullable) `as` #name )

217− ( primaryKey #id `as` #pk_users ) >>>

218− createTable #emails

219− ( serial `as` #id :*

220− (int & notNullable) `as` #user_id :*

221− (text & nullable) `as` #email )

222− ( primaryKey #id `as` #pk_emails :*

223− foreignKey #user_id #users #id

224− OnDeleteCascade OnUpdateCascade `as` #fk_user_id )

225−in printSQL setup

226−:}

227−CREATE TABLE "users" ("id" serial, "name" text NOT NULL, CONSTRAINT "pk_users" PRIMARY KEY ("id"));

228−CREATE TABLE "emails" ("id" serial, "user_id" int NOT NULL, "email" text NULL, CONSTRAINT "pk_emails" PRIMARY KEY ("id"), CONSTRAINT "fk_user_id" FOREIGN KEY ("user_id") REFERENCES "users" ("id") ON DELETE CASCADE ON UPDATE CASCADE);

229−

230−A `foreignKey` can even be a table self-reference.

231−

232−>>> :{

233−type Schema =

234− '[ "employees" ::: 'Table (

235− '[ "employees_pk" ::: 'PrimaryKey '["id"]

236− , "employees_employer_fk" ::: 'ForeignKey '["employer_id"] "employees" '["id"]

237− ] :=>

238− '[ "id" ::: 'Def :=> 'NotNull 'PGint4

239− , "name" ::: 'NoDef :=> 'NotNull 'PGtext

240− , "employer_id" ::: 'NoDef :=> 'Null 'PGint4

241− ])

242− ]

243−:}

244−

245−>>> :{

246−let

247− setup :: Definition (Public '[]) (Public Schema)

248− setup =

249− createTable #employees

250− ( serial `as` #id :*

251− (text & notNullable) `as` #name :*

252− (integer & nullable) `as` #employer_id )

253− ( primaryKey #id `as` #employees_pk :*

254− foreignKey #employer_id #employees #id

255− OnDeleteCascade OnUpdateCascade `as` #employees_employer_fk )

256−in printSQL setup

257−:}

258−CREATE TABLE "employees" ("id" serial, "name" text NOT NULL, "employer_id" integer NULL, CONSTRAINT "employees_pk" PRIMARY KEY ("id"), CONSTRAINT "employees_employer_fk" FOREIGN KEY ("employer_id") REFERENCES "employees" ("id") ON DELETE CASCADE ON UPDATE CASCADE);

259−-}

260−foreignKey

261− :: (ForeignKeyed schemas sch schema child parent

262− table reftable

263− columns refcolumns

264− constraints cols

265− reftys tys )

266− => NP Alias columns

267− -- ^ column or columns in the table

268− -> Alias parent

269− -- ^ reference table

270− -> NP Alias refcolumns

271− -- ^ reference column or columns in the reference table

272− -> OnDeleteClause

273− -- ^ what to do when reference is deleted

274− -> OnUpdateClause

275− -- ^ what to do when reference is updated

276− -> TableConstraintExpression sch child schemas

277− ('ForeignKey columns parent refcolumns)

278−foreignKey keys parent refs ondel onupd = UnsafeTableConstraintExpression $

279− "FOREIGN KEY" <+> parenthesized (renderSQL keys)

280− <+> "REFERENCES" <+> renderSQL parent

281− <+> parenthesized (renderSQL refs)

282− <+> renderSQL ondel

283− <+> renderSQL onupd

284−

285−-- | A constraint synonym between types involved in a foreign key constraint.

286−type ForeignKeyed schemas

287− sch

288− schema

289− child parent

290− table reftable

291− columns refcolumns

292− constraints cols

293− reftys tys =

294− ( Has sch schemas schema

295− , Has child schema ('Table table)

296− , Has parent schema ('Table reftable)

297− , HasAll columns (TableToColumns table) tys

298− , reftable ~ (constraints :=> cols)

299− , HasAll refcolumns cols reftys

300− , SOP.AllZip SamePGType tys reftys

301− , Uniquely refcolumns constraints )

302−

303−-- | `OnDeleteClause` indicates what to do with rows that reference a deleted row.

304−data OnDeleteClause

305− = OnDeleteNoAction

306− -- ^ if any referencing rows still exist when the constraint is checked,

307− -- an error is raised

308− | OnDeleteRestrict -- ^ prevents deletion of a referenced row

309− | OnDeleteCascade

310− -- ^ specifies that when a referenced row is deleted,

311− -- row(s) referencing it should be automatically deleted as well

312− deriving (GHC.Generic,Show,Eq,Ord)

313−instance NFData OnDeleteClause

314−-- | Render `OnDeleteClause`.

315−instance RenderSQL OnDeleteClause where

316− renderSQL = \case

317− OnDeleteNoAction -> "ON DELETE NO ACTION"

318− OnDeleteRestrict -> "ON DELETE RESTRICT"

319− OnDeleteCascade -> "ON DELETE CASCADE"

320−

321−-- | Analagous to `OnDeleteClause` there is also `OnUpdateClause` which is invoked

322−-- when a referenced column is changed (updated).

323−data OnUpdateClause

324− = OnUpdateNoAction

325− -- ^ if any referencing rows has not changed when the constraint is checked,

326− -- an error is raised

327− | OnUpdateRestrict -- ^ prevents update of a referenced row

328− | OnUpdateCascade

329− -- ^ the updated values of the referenced column(s) should be copied

330− -- into the referencing row(s)

331− deriving (GHC.Generic,Show,Eq,Ord)

332−instance NFData OnUpdateClause

333−

334−-- | Render `OnUpdateClause`.

335−instance RenderSQL OnUpdateClause where

336− renderSQL = \case

337− OnUpdateNoAction -> "ON UPDATE NO ACTION"

338− OnUpdateRestrict -> "ON UPDATE RESTRICT"

339− OnUpdateCascade -> "ON UPDATE CASCADE"

squeal-postgresql/src/Squeal/PostgreSQL/Definition/Type.hsdeleted−229

@@ -1,229 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Definition.Type

3−Description: Create and drop type definitions

4−Copyright: (c) Eitan Chatav, 2017

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Create and drop type definitions.

9−-}

10−

11−{-# LANGUAGE

12− AllowAmbiguousTypes

13− , ConstraintKinds

14− , DeriveAnyClass

15− , DeriveGeneric

16− , DerivingStrategies

17− , FlexibleContexts

18− , FlexibleInstances

19− , GADTs

20− , LambdaCase

21− , MultiParamTypeClasses

22− , OverloadedLabels

23− , OverloadedStrings

24− , RankNTypes

25− , ScopedTypeVariables

26− , TypeApplications

27− , TypeInType

28− , TypeOperators

29− , UndecidableSuperClasses

30−#-}

31−

32−module Squeal.PostgreSQL.Definition.Type

33− ( createTypeEnum

34− , createTypeEnumFrom

35− , createTypeComposite

36− , createTypeCompositeFrom

37− , createTypeRange

38− , createDomain

39− , dropType

40− , dropTypeIfExists

41− ) where

42−

43−import Data.ByteString

44−import Data.Monoid

45−import GHC.TypeLits

46−import Prelude hiding ((.), id)

47−

48−import qualified Generics.SOP as SOP

49−

50−import Squeal.PostgreSQL.Alias

51−import Squeal.PostgreSQL.Expression.Logic

52−import Squeal.PostgreSQL.Expression.Type

53−import Squeal.PostgreSQL.Definition

54−import Squeal.PostgreSQL.List

55−import Squeal.PostgreSQL.PG

56−import Squeal.PostgreSQL.Render

57−import Squeal.PostgreSQL.Schema

58−

59−-- $setup

60−-- >>> import Squeal.PostgreSQL

61−-- >>> import qualified GHC.Generics as GHC

62−-- >>> import qualified Generics.SOP as SOP

63−

64−-- | Enumerated types are created using the `createTypeEnum` command, for example

65−--

66−-- >>> printSQL $ (createTypeEnum #mood (label @"sad" :* label @"ok" :* label @"happy") :: Definition (Public '[]) '["public" ::: '["mood" ::: 'Typedef ('PGenum '["sad","ok","happy"])]])

67−-- CREATE TYPE "mood" AS ENUM ('sad', 'ok', 'happy');

68−createTypeEnum

69− :: (KnownSymbol enum, Has sch schemas schema, SOP.All KnownSymbol labels)

70− => QualifiedAlias sch enum

71− -- ^ name of the user defined enumerated type

72− -> NP PGlabel labels

73− -- ^ labels of the enumerated type

74− -> Definition schemas (Alter sch (Create enum ('Typedef ('PGenum labels)) schema) schemas)

75−createTypeEnum enum labels = UnsafeDefinition $

76− "CREATE" <+> "TYPE" <+> renderSQL enum <+> "AS" <+> "ENUM" <+>

77− parenthesized (renderSQL labels) <> ";"

78−

79−-- | Enumerated types can also be generated from a Haskell type, for example

80−--

81−-- >>> data Schwarma = Beef | Lamb | Chicken deriving GHC.Generic

82−-- >>> instance SOP.Generic Schwarma

83−-- >>> instance SOP.HasDatatypeInfo Schwarma

84−-- >>> :{

85−-- let

86−-- createSchwarma :: Definition (Public '[]) '["public" ::: '["schwarma" ::: 'Typedef (PG (Enumerated Schwarma))]]

87−-- createSchwarma = createTypeEnumFrom @Schwarma #schwarma

88−-- in

89−-- printSQL createSchwarma

90−-- :}

91−-- CREATE TYPE "schwarma" AS ENUM ('Beef', 'Lamb', 'Chicken');

92−createTypeEnumFrom

93− :: forall hask sch enum schemas schema.

94− ( SOP.Generic hask

95− , SOP.All KnownSymbol (LabelsPG hask)

96− , KnownSymbol enum

97− , Has sch schemas schema )

98− => QualifiedAlias sch enum

99− -- ^ name of the user defined enumerated type

100− -> Definition schemas (Alter sch (Create enum ('Typedef (PG (Enumerated hask))) schema) schemas)

101−createTypeEnumFrom enum = createTypeEnum enum

102− (SOP.hpure label :: NP PGlabel (LabelsPG hask))

103−

104−{- | `createTypeComposite` creates a composite type. The composite type is

105−specified by a list of attribute names and data types.

106−

107−>>> :{

108−type PGcomplex = 'PGcomposite

109− '[ "real" ::: 'NotNull 'PGfloat8

110− , "imaginary" ::: 'NotNull 'PGfloat8 ]

111−:}

112−

113−>>> :{

114−let

115− setup :: Definition (Public '[]) '["public" ::: '["complex" ::: 'Typedef PGcomplex]]

116− setup = createTypeComposite #complex

117− (float8 `as` #real :* float8 `as` #imaginary)

118−in printSQL setup

119−:}

120−CREATE TYPE "complex" AS ("real" float8, "imaginary" float8);

121−-}

122−createTypeComposite

123− :: (KnownSymbol ty, Has sch schemas schema, SOP.SListI fields)

124− => QualifiedAlias sch ty

125− -- ^ name of the user defined composite type

126− -> NP (Aliased (TypeExpression schemas)) fields

127− -- ^ list of attribute names and data types

128− -> Definition schemas (Alter sch (Create ty ('Typedef ('PGcomposite fields)) schema) schemas)

129−createTypeComposite ty fields = UnsafeDefinition $

130− "CREATE" <+> "TYPE" <+> renderSQL ty <+> "AS" <+> parenthesized

131− (renderCommaSeparated renderField fields) <> ";"

132− where

133− renderField :: Aliased (TypeExpression schemas) x -> ByteString

134− renderField (typ `As` alias) =

135− renderSQL alias <+> renderSQL typ

136−

137−-- | Composite types can also be generated from a Haskell type, for example

138−--

139−-- >>> data Complex = Complex {real :: Double, imaginary :: Double} deriving GHC.Generic

140−-- >>> instance SOP.Generic Complex

141−-- >>> instance SOP.HasDatatypeInfo Complex

142−-- >>> type Schema = '["complex" ::: 'Typedef (PG (Composite Complex))]

143−-- >>> :{

144−-- let

145−-- createComplex :: Definition (Public '[]) (Public Schema)

146−-- createComplex = createTypeCompositeFrom @Complex #complex

147−-- in

148−-- printSQL createComplex

149−-- :}

150−-- CREATE TYPE "complex" AS ("real" float8, "imaginary" float8);

151−createTypeCompositeFrom

152− :: forall hask sch ty schemas schema.

153− ( SOP.All (FieldTyped schemas) (RowPG hask)

154− , KnownSymbol ty

155− , Has sch schemas schema )

156− => QualifiedAlias sch ty

157− -- ^ name of the user defined composite type

158− -> Definition schemas (Alter sch (Create ty ( 'Typedef (PG (Composite hask))) schema) schemas)

159−createTypeCompositeFrom ty = createTypeComposite ty

160− (SOP.hcpure (SOP.Proxy :: SOP.Proxy (FieldTyped schemas)) fieldtype

161− :: NP (Aliased (TypeExpression schemas)) (RowPG hask))

162−

163−{-|

164−`createDomain` creates a new domain. A domain is essentially a data type

165−with constraints (restrictions on the allowed set of values).

166−

167−Domains are useful for abstracting common constraints on fields

168−into a single location for maintenance. For example, several tables might

169−contain email address columns, all requiring the same `check` constraint

170−to verify the address syntax. Define a domain rather than setting up

171−each table's constraint individually.

172−

173−>>> :{

174−let

175− createPositive :: Definition (Public '[]) (Public '["positive" ::: 'Typedef 'PGfloat4])

176− createPositive = createDomain #positive real (#value .> 0 .&& (#value & isNotNull))

177−in printSQL createPositive

178−:}

179−CREATE DOMAIN "positive" AS real CHECK ((("value" > 0) AND "value" IS NOT NULL));

180−-}

181−createDomain

182− :: (Has sch schemas schema, KnownSymbol dom)

183− => QualifiedAlias sch dom

184− -> (forall null. TypeExpression schemas (null ty))

185− -> (forall tab. Condition '[] '[] 'Ungrouped schemas '[] '[tab ::: '["value" ::: 'Null ty]])

186− -> Definition schemas (Alter sch (Create dom ('Typedef ty) schema) schemas)

187−createDomain dom ty condition =

188− UnsafeDefinition $ "CREATE DOMAIN" <+> renderSQL dom

189− <+> "AS" <+> renderTypeExpression ty

190− <+> "CHECK" <+> parenthesized (renderSQL condition) <> ";"

191−

192−{- |

193−>>> :{

194−let

195− createSmallIntRange :: Definition (Public '[]) (Public '["int2range" ::: 'Typedef ('PGrange 'PGint2)])

196− createSmallIntRange = createTypeRange #int2range int2

197−in printSQL createSmallIntRange

198−:}

199−CREATE TYPE "int2range" AS RANGE (subtype = int2);

200−-}

201−createTypeRange

202− :: (Has sch schemas schema, KnownSymbol range)

203− => QualifiedAlias sch range

204− -> (forall null. TypeExpression schemas (null ty))

205− -> Definition schemas (Alter sch (Create range ('Typedef ('PGrange ty)) schema) schemas)

206−createTypeRange range ty = UnsafeDefinition $

207− "CREATE" <+> "TYPE" <+> renderSQL range <+> "AS" <+> "RANGE" <+>

208− parenthesized ("subtype" <+> "=" <+> renderTypeExpression ty) <> ";"

209−

210−-- | Drop a type.

211−--

212−-- >>> data Schwarma = Beef | Lamb | Chicken deriving GHC.Generic

213−-- >>> instance SOP.Generic Schwarma

214−-- >>> instance SOP.HasDatatypeInfo Schwarma

215−-- >>> printSQL (dropType #schwarma :: Definition '["public" ::: '["schwarma" ::: 'Typedef (PG (Enumerated Schwarma))]] (Public '[]))

216−-- DROP TYPE "schwarma";

217−dropType

218− :: (Has sch schemas schema, KnownSymbol td)

219− => QualifiedAlias sch td

220− -- ^ name of the user defined type

221− -> Definition schemas (Alter sch (DropSchemum td 'Typedef schema) schemas)

222−dropType tydef = UnsafeDefinition $ "DROP" <+> "TYPE" <+> renderSQL tydef <> ";"

223−

224−dropTypeIfExists

225− :: (Has sch schemas schema, KnownSymbol td)

226− => QualifiedAlias sch td

227− -- ^ name of the user defined type

228− -> Definition schemas (Alter sch (DropSchemumIfExists td 'Typedef schema) schemas)

229−dropTypeIfExists tydef = UnsafeDefinition $ "DROP" <+> "TYPE" <+> renderSQL tydef <> ";"

squeal-postgresql/src/Squeal/PostgreSQL/Definition/View.hsdeleted−104

@@ -1,104 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Definition.View

3−Description: Create and drop view definitions

4−Copyright: (c) Eitan Chatav, 2017

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Create and drop view definitions.

9−-}

10−

11−{-# LANGUAGE

12− AllowAmbiguousTypes

13− , ConstraintKinds

14− , DeriveAnyClass

15− , DeriveGeneric

16− , DerivingStrategies

17− , FlexibleContexts

18− , FlexibleInstances

19− , GADTs

20− , LambdaCase

21− , MultiParamTypeClasses

22− , OverloadedLabels

23− , OverloadedStrings

24− , RankNTypes

25− , ScopedTypeVariables

26− , TypeApplications

27− , TypeInType

28− , TypeOperators

29− , UndecidableSuperClasses

30−#-}

31−

32−module Squeal.PostgreSQL.Definition.View

33− ( createView

34− , createOrReplaceView

35− , dropView

36− , dropViewIfExists

37− ) where

38−

39−import GHC.TypeLits

40−

41−import Squeal.PostgreSQL.Alias

42−import Squeal.PostgreSQL.Definition

43−import Squeal.PostgreSQL.Query

44−import Squeal.PostgreSQL.Render

45−import Squeal.PostgreSQL.Schema

46−

47−-- $setup

48−-- >>> import Squeal.PostgreSQL

49−

50−{- | Create a view.

51−>>> type ABC = '["a" ::: 'NoDef :=> 'Null 'PGint4, "b" ::: 'NoDef :=> 'Null 'PGint4, "c" ::: 'NoDef :=> 'Null 'PGint4]

52−>>> type BC = '["b" ::: 'Null 'PGint4, "c" ::: 'Null 'PGint4]

53−>>> :{

54−let

55− definition :: Definition

56− '[ "public" ::: '["abc" ::: 'Table ('[] :=> ABC)]]

57− '[ "public" ::: '["abc" ::: 'Table ('[] :=> ABC), "bc" ::: 'View BC]]

58− definition =

59− createView #bc (select_ (#b :* #c) (from (table #abc)))

60−in printSQL definition

61−:}

62−CREATE VIEW "bc" AS SELECT "b" AS "b", "c" AS "c" FROM "abc" AS "abc";

63−-}

64−createView

65− :: (Has sch schemas schema, KnownSymbol vw)

66− => QualifiedAlias sch vw -- ^ the name of the view to add

67− -> Query '[] '[] schemas '[] view -- ^ query

68− -> Definition schemas (Alter sch (Create vw ('View view) schema) schemas)

69−createView alias query = UnsafeDefinition $

70− "CREATE" <+> "VIEW" <+> renderSQL alias <+> "AS"

71− <+> renderQuery query <> ";"

72−

73−createOrReplaceView

74− :: (Has sch schemas schema, KnownSymbol vw)

75− => QualifiedAlias sch vw -- ^ the name of the view to add

76− -> Query '[] '[] schemas '[] view -- ^ query

77− -> Definition schemas (Alter sch (CreateOrReplace vw ('View view) schema) schemas)

78−createOrReplaceView alias query = UnsafeDefinition $

79− "CREATE OR REPLACE VIEW" <+> renderSQL alias <+> "AS"

80− <+> renderQuery query <> ";"

81−

82−-- | Drop a view.

83−--

84−-- >>> :{

85−-- let

86−-- definition :: Definition

87−-- '[ "public" ::: '["abc" ::: 'Table ('[] :=> '["a" ::: 'NoDef :=> 'Null 'PGint4, "b" ::: 'NoDef :=> 'Null 'PGint4, "c" ::: 'NoDef :=> 'Null 'PGint4])

88−-- , "bc" ::: 'View ('["b" ::: 'Null 'PGint4, "c" ::: 'Null 'PGint4])]]

89−-- '[ "public" ::: '["abc" ::: 'Table ('[] :=> '["a" ::: 'NoDef :=> 'Null 'PGint4, "b" ::: 'NoDef :=> 'Null 'PGint4, "c" ::: 'NoDef :=> 'Null 'PGint4])]]

90−-- definition = dropView #bc

91−-- in printSQL definition

92−-- :}

93−-- DROP VIEW "bc";

94−dropView

95− :: (Has sch schemas schema, KnownSymbol vw)

96− => QualifiedAlias sch vw -- ^ view to remove

97− -> Definition schemas (Alter sch (DropSchemum vw 'View schema) schemas)

98−dropView vw = UnsafeDefinition $ "DROP VIEW" <+> renderSQL vw <> ";"

99−

100−dropViewIfExists

101− :: (Has sch schemas schema, KnownSymbol vw)

102− => QualifiedAlias sch vw -- ^ view to remove

103− -> Definition schemas (Alter sch (DropIfExists vw schema) schemas)

104−dropViewIfExists vw = UnsafeDefinition $ "DROP VIEW IF EXISTS" <+> renderSQL vw <> ";"

squeal-postgresql/src/Squeal/PostgreSQL/Expression.hs+2307−230

@@ -1,13 +1,14 @@

11{-|

22Module: Squeal.PostgreSQL.Expression

33Description: Squeal expressions

4−Copyright: (c) Eitan Chatav, 2019

4+Copyright: (c) Eitan Chatav, 2017

55Maintainer: eitan@morphism.tech

66Stability: experimental

88Squeal expressions are the atoms used to build statements.

99-}

1010

11+{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}

1112{-# LANGUAGE

1213 AllowAmbiguousTypes

1314 , ConstraintKinds

@@ -33,214 +34,344 @@ Squeal expressions are the atoms used to build statements.

3334module Squeal.PostgreSQL.Expression

3435 ( -- * Expression

3536 Expression (..)

36− , Expr

37− , type (-->)

38− , FunctionDB

39− , unsafeFunction

40− , function

41− , unsafeLeftOp

42− , leftOp

43− , unsafeRightOp

44− , rightOp

4537 , Operator

46− , OperatorDB

38+ , (:-->)

39+ , HasParameter (parameter)

40+ , param

41+ -- ** Null

42+ , null_

43+ , notNull

44+ , coalesce

45+ , fromNull

46+ , isNull

47+ , isNotNull

48+ , matchNull

49+ , nullIf

50+ -- ** Collections

51+ , array

52+ , cardinality

53+ , index

54+ , row

55+ , field

56+ -- ** Functions

4757 , unsafeBinaryOp

48− , binaryOp

49− , FunctionVar

50− , unsafeFunctionVar

51− , type (--->)

52− , FunctionNDB

53− , unsafeFunctionN

54− , functionN

55− , PGSubset (..)

56− , PGIntersect (..)

58+ , unsafeUnaryOp

59+ , unsafeFunction

60+ , unsafeVariadicFunction

61+ , atan2_

62+ , cast

63+ , quot_

64+ , rem_

65+ , trunc

66+ , round_

67+ , ceiling_

68+ , greatest

69+ , least

70+ -- ** Conditions

71+ , true

72+ , false

73+ , not_

74+ , (.&&)

75+ , (.||)

76+ , Condition

77+ , caseWhenThenElse

78+ , ifThenElse

79+ , (.==)

80+ , (./=)

81+ , (.>=)

82+ , (.<)

83+ , (.<=)

84+ , (.>)

85+ , between

86+ , notBetween

87+ , betweenSymmetric

88+ , notBetweenSymmetric

89+ , isDistinctFrom

90+ , isNotDistinctFrom

91+ , isTrue

92+ , isNotTrue

93+ , isFalse

94+ , isNotFalse

95+ , isUnknown

96+ , isNotUnknown

97+ -- ** Time

98+ , currentDate

99+ , currentTime

100+ , currentTimestamp

101+ , localTime

102+ , localTimestamp

103+ , TimeOp (..)

104+ , makeDate

105+ , makeTime

106+ , makeTimestamp

107+ , makeTimestamptz

108+ -- ** Text

109+ , lower

110+ , upper

111+ , charLength

112+ , like

113+ , ilike

114+ -- ** Json

115+ -- *** Json and Jsonb operators

116+ , (.->)

117+ , (.->>)

118+ , (.#>)

119+ , (.#>>)

120+ -- *** Jsonb operators

121+ , (.@>)

122+ , (.<@)

123+ , (.?)

124+ , (.?|)

125+ , (.?&)

126+ , (.-.)

127+ , (#-.)

128+ -- *** Functions

129+ , jsonLit

130+ , jsonbLit

131+ , toJson

132+ , toJsonb

133+ , arrayToJson

134+ , rowToJson

135+ , jsonBuildArray

136+ , jsonbBuildArray

137+ , jsonBuildObject

138+ , jsonbBuildObject

139+ , jsonObject

140+ , jsonbObject

141+ , jsonZipObject

142+ , jsonbZipObject

143+ , jsonArrayLength

144+ , jsonbArrayLength

145+ , jsonExtractPath

146+ , jsonbExtractPath

147+ , jsonExtractPathAsText

148+ , jsonbExtractPathAsText

149+ , jsonTypeof

150+ , jsonbTypeof

151+ , jsonStripNulls

152+ , jsonbStripNulls

153+ , jsonbSet

154+ , jsonbInsert

155+ , jsonbPretty

156+ -- ** Text Search

157+ , (@@)

158+ , (.&)

159+ , (.|)

160+ , (.!)

161+ , (<->)

162+ -- ** Aggregation

163+ , Aggregate (..)

164+ , Distinction (..)

165+ , PGAvg

166+ -- * Window Functions

167+ , WindowDefinition (..)

168+ , partitionBy

169+ , WindowFunction (..)

170+ , rank

171+ , rowNumber

172+ , denseRank

173+ , percentRank

174+ , cumeDist

175+ , ntile

176+ , lag

177+ , lead

178+ , firstValue

179+ , lastValue

180+ , nthValue

181+ -- * Sorting

182+ , SortExpression (..)

183+ , OrderBy (..)

184+ -- * Types

185+ , TypeExpression (..)

186+ , PGTyped (..)

187+ , typedef

188+ , typetable

189+ , typeview

190+ , bool

191+ , int2

192+ , smallint

193+ , int4

194+ , int

195+ , integer

196+ , int8

197+ , bigint

198+ , numeric

199+ , float4

200+ , real

201+ , float8

202+ , doublePrecision

203+ , money

204+ , text

205+ , char

206+ , character

207+ , varchar

208+ , characterVarying

209+ , bytea

210+ , timestamp

211+ , timestampWithTimeZone

212+ , date

213+ , time

214+ , timeWithTimeZone

215+ , interval

216+ , uuid

217+ , inet

218+ , json

219+ , jsonb

220+ , vararray

221+ , fixarray

222+ , tsvector

223+ , tsquery

224+ , arrayToTSvector

225+ , tsvectorLength

226+ , numnode

227+ , plainToTSquery

228+ , phraseToTSquery

229+ , websearchToTSquery

230+ , queryTree

231+ , toTSquery

232+ , toTSvector

57233 -- * Re-export

58234 , (&)

235+ , NP (..)

236+ , (:*:) (..)

59237 , K (..)

60− , unK

61238 ) where

62239

63240import Control.Category

64241import Control.DeepSeq

65242import Data.ByteString (ByteString)

243+import Data.ByteString.Lazy (toStrict)

66244import Data.Function ((&))

67245import Data.Semigroup hiding (All)

246+import qualified Data.Aeson as JSON

68247import Data.String

248+import Data.Word

69249import Generics.SOP hiding (All, from)

250+import GHC.Generics ((:*:) (..))

70251import GHC.OverloadedLabels

71252import GHC.TypeLits

72253import Numeric

73254import Prelude hiding (id, (.))

74255

256+import qualified Data.ByteString as ByteString

75257import qualified GHC.Generics as GHC

258+import qualified Generics.SOP as SOP

76259

77−import Squeal.PostgreSQL.Alias

78−import Squeal.PostgreSQL.List

79260import Squeal.PostgreSQL.Render

80261import Squeal.PostgreSQL.Schema

81262

82−-- $setup

83−-- >>> import Squeal.PostgreSQL

84−

85263{-----------------------------------------

86264column expressions

87265-----------------------------------------}

88266

89267{- | `Expression`s are used in a variety of contexts,

90−such as in the target `Squeal.PostgreSQL.Query.List` of the

91−`Squeal.PostgreSQL.Query.select` command,

268+such as in the target list of the `Squeal.PostgreSQL.Query.select` command,

92269as new column values in `Squeal.PostgreSQL.Manipulation.insertRow` or

93270`Squeal.PostgreSQL.Manipulation.update`,

94−or in search `Squeal.PostgreSQL.Logic.Condition`s in a number of commands.

271+or in search `Condition`s in a number of commands.

95272

96273The expression syntax allows the calculation of

97274values from primitive expression using arithmetic, logical,

98275and other operations.

99−

100−The type parameters of `Expression` are

101−

102−* @outer :: @ `FromType`, the @from@ clauses of any outer queries in which

103− the `Expression` is a correlated subquery expression;

104−* @commons :: @ `FromType`, the `Squeal.PostgreSQL.Query.CommonTableExpression`s

105− that are in scope for the `Expression`;

106−* @grp :: @ `Grouping`, the `Grouping` of the @from@ clause which may limit

107− which columns may be referenced by alias;

108−* @schemas :: @ `SchemasType`, the schemas of your database that are in

109− scope for the `Expression`;

110−* @from :: @ `FromType`, the @from@ clause which the `Expression` may use

111− to reference columns by alias;

112−* @ty :: @ `NullityType`, the type of the `Expression`.

113276-}

114277newtype Expression

115278 (outer :: FromType)

116− (commons :: FromType)

117279 (grp :: Grouping)

280+ (commons :: FromType)

118281 (schemas :: SchemasType)

119282 (params :: [NullityType])

120283 (from :: FromType)

121284 (ty :: NullityType)

122285 = UnsafeExpression { renderExpression :: ByteString }

123286 deriving (GHC.Generic,Show,Eq,Ord,NFData)

124−instance RenderSQL (Expression outer commons grp schemas params from ty) where

287+instance RenderSQL (Expression outer grp commons schemas params from ty) where

125288 renderSQL = renderExpression

126289

127−-- | An `Expr` is a closed `Expression`.

128−-- It is a F@RankNType@ but don't be scared.

129−-- Think of it as an expression which sees no

130−-- namespaces, so you can't use parameters

131−-- or alias references. It can be used as

132−-- a simple piece of more complex `Expression`s.

133−type Expr x

134− = forall outer commons grp schemas params from

135− . Expression outer commons grp schemas params from x

136− -- ^ cannot reference aliases

137−

138−-- | A @RankNType@ for binary operators.

139290type Operator x1 x2 y

140− = forall outer commons grp schemas params from

141− . Expression outer commons grp schemas params from x1

142− -- ^ left input

143− -> Expression outer commons grp schemas params from x2

144− -- ^ right input

145− -> Expression outer commons grp schemas params from y

146− -- ^ output

147−

148−type OperatorDB schemas x1 x2 y

149− = forall outer commons grp params from

150− . Expression outer commons grp schemas params from x1

151− -- ^ left input

152− -> Expression outer commons grp schemas params from x2

153− -- ^ right input

154− -> Expression outer commons grp schemas params from y

155− -- ^ output

156−

157−-- | A @RankNType@ for functions with a single argument.

158−-- These could be either function calls or unary operators.

159−-- This is a subtype of the usual Haskell function type `Prelude.->`,

160−-- indeed a subcategory as it is closed under the usual

161−-- `Prelude..` and `Prelude.id`.

162−type (-->) x y

163− = forall outer commons grp schemas params from

164− . Expression outer commons grp schemas params from x

165− -- ^ input

166− -> Expression outer commons grp schemas params from y

167− -- ^ output

168−

169−type FunctionDB schemas x y

170− = forall outer commons grp params from

171− . Expression outer commons grp schemas params from x

172− -- ^ input

173− -> Expression outer commons grp schemas params from y

174− -- ^ output

175−

176−{- | A @RankNType@ for functions with a fixed-length list of heterogeneous arguments.

177−Use the `*:` operator to end your argument lists, like so.

178−

179−>>> printSQL (unsafeFunctionN "fun" (true :* false :* localTime *: true))

180−fun(TRUE, FALSE, LOCALTIME, TRUE)

181−-}

182−type (--->) xs y

183− = forall outer commons grp schemas params from

184− . NP (Expression outer commons grp schemas params from) xs

185− -- ^ inputs

186− -> Expression outer commons grp schemas params from y

187− -- ^ output

188−

189−type FunctionNDB schemas xs y

190− = forall outer commons grp params from

191− . NP (Expression outer commons grp schemas params from) xs

192− -- ^ inputs

193− -> Expression outer commons grp schemas params from y

194− -- ^ output

195−

196−{- | A @RankNType@ for functions with a variable-length list of

197−homogeneous arguments and at least 1 more argument.

198−-}

199−type FunctionVar x0 x1 y

200− = forall outer commons grp schemas params from

201− . [Expression outer commons grp schemas params from x0]

202− -- ^ inputs

203− -> Expression outer commons grp schemas params from x1

204− -- ^ must have at least 1 input

205− -> Expression outer commons grp schemas params from y

206− -- ^ output

207−

208−{- | >>> printSQL (unsafeFunctionVar "greatest" [true, null_] false)

209−greatest(TRUE, NULL, FALSE)

210−-}

211−unsafeFunctionVar :: ByteString -> FunctionVar x0 x1 y

212−unsafeFunctionVar fun xs x = UnsafeExpression $ fun <> parenthesized

213− (commaSeparated (renderSQL <$> xs) <> ", " <> renderSQL x)

291+ = forall outer grp commons schemas params from

292+ . Expression outer grp commons schemas params from x1

293+ -> Expression outer grp commons schemas params from x2

294+ -> Expression outer grp commons schemas params from y

295+

296+type (:-->) x y

297+ = forall outer grp commons schemas params from

298+ . Expression outer grp commons schemas params from x

299+ -> Expression outer grp commons schemas params from y

300+

301+type FunctionHet xs y

302+ = forall outer grp commons schemas params from

303+ . NP (Expression outer grp commons schemas params from) xs

304+ -> Expression outer grp commons schemas params from y

305+

306+{- | A `HasParameter` constraint is used to indicate a value that is

307+supplied externally to a SQL statement.

308+`Squeal.PostgreSQL.PQ.manipulateParams`,

309+`Squeal.PostgreSQL.PQ.queryParams` and

310+`Squeal.PostgreSQL.PQ.traversePrepared` support specifying data values

311+separately from the SQL command string, in which case `param`s are used to

312+refer to the out-of-line data values.

313+-}

314+class KnownNat n => HasParameter

315+ (n :: Nat)

316+ (params :: [NullityType])

317+ (ty :: NullityType)

318+ | n params -> ty where

319+ -- | `parameter` takes a `Nat` using type application and a `TypeExpression`.

320+ --

321+ -- >>> let expr = parameter @1 int4 :: Expression outer grp '[] schemas '[ 'Null 'PGint4] from ('Null 'PGint4)

322+ -- >>> printSQL expr

323+ -- ($1 :: int4)

324+ parameter

325+ :: TypeExpression schemas ty

326+ -> Expression outer grp commons schemas params from ty

327+ parameter ty = UnsafeExpression $ parenthesized $

328+ "$" <> renderNat @n <+> "::"

329+ <+> renderSQL ty

330+instance {-# OVERLAPPING #-} HasParameter 1 (ty1:tys) ty1

331+instance {-# OVERLAPPABLE #-} (KnownNat n, HasParameter (n-1) params ty)

332+ => HasParameter n (ty' : params) ty

333+

334+-- | `param` takes a `Nat` using type application and for basic types,

335+-- infers a `TypeExpression`.

336+--

337+-- >>> let expr = param @1 :: Expression outer grp commons schemas '[ 'Null 'PGint4] from ('Null 'PGint4)

338+-- >>> printSQL expr

339+-- ($1 :: int4)

340+param

341+ :: forall n outer commons schemas params from grp ty

342+ . (PGTyped schemas ty, HasParameter n params ty)

343+ => Expression outer grp commons schemas params from ty -- ^ param

344+param = parameter @n (pgtype @schemas)

214345

215346instance (HasUnique tab (Join outer from) row, Has col row ty)

216− => IsLabel col (Expression outer commons 'Ungrouped schemas params from ty) where

347+ => IsLabel col (Expression outer 'Ungrouped commons schemas params from ty) where

217348 fromLabel = UnsafeExpression $ renderSQL (Alias @col)

218349instance (HasUnique tab (Join outer from) row, Has col row ty, tys ~ '[ty])

219− => IsLabel col (NP (Expression outer commons 'Ungrouped schemas params from) tys) where

350+ => IsLabel col (NP (Expression outer 'Ungrouped commons schemas params from) tys) where

220351 fromLabel = fromLabel @col :* Nil

221352instance (HasUnique tab (Join outer from) row, Has col row ty, column ~ (col ::: ty))

222353 => IsLabel col

223− (Aliased (Expression outer commons 'Ungrouped schemas params from) column) where

354+ (Aliased (Expression outer 'Ungrouped commons schemas params from) column) where

224355 fromLabel = fromLabel @col `As` Alias

225356instance (HasUnique tab (Join outer from) row, Has col row ty, columns ~ '[col ::: ty])

226357 => IsLabel col

227− (NP (Aliased (Expression outer commons 'Ungrouped schemas params from)) columns) where

358+ (NP (Aliased (Expression outer 'Ungrouped commons schemas params from)) columns) where

228359 fromLabel = fromLabel @col :* Nil

229360

230361instance (Has tab (Join outer from) row, Has col row ty)

231− => IsQualified tab col (Expression outer commons 'Ungrouped schemas params from ty) where

362+ => IsQualified tab col (Expression outer 'Ungrouped commons schemas params from ty) where

232363 tab ! col = UnsafeExpression $

233364 renderSQL tab <> "." <> renderSQL col

234365instance (Has tab (Join outer from) row, Has col row ty, tys ~ '[ty])

235− => IsQualified tab col (NP (Expression outer commons 'Ungrouped schemas params from) tys) where

366+ => IsQualified tab col (NP (Expression outer 'Ungrouped commons schemas params from) tys) where

236367 tab ! col = tab ! col :* Nil

237368instance (Has tab (Join outer from) row, Has col row ty, column ~ (col ::: ty))

238369 => IsQualified tab col

239− (Aliased (Expression outer commons 'Ungrouped schemas params from) column) where

370+ (Aliased (Expression outer 'Ungrouped commons schemas params from) column) where

240371 tab ! col = tab ! col `As` col

241372instance (Has tab (Join outer from) row, Has col row ty, columns ~ '[col ::: ty])

242373 => IsQualified tab col

243− (NP (Aliased (Expression outer commons 'Ungrouped schemas params from)) columns) where

374+ (NP (Aliased (Expression outer 'Ungrouped commons schemas params from)) columns) where

244375 tab ! col = tab ! col :* Nil

245376

246377instance

@@ -248,7 +379,7 @@ instance

248379 , Has col row ty

249380 , GroupedBy tab col bys

250381 ) => IsLabel col

251− (Expression outer commons ('Grouped bys) schemas params from ty) where

382+ (Expression outer ('Grouped bys) commons schemas params from ty) where

252383 fromLabel = UnsafeExpression $ renderSQL (Alias @col)

253384instance

254385 ( HasUnique tab (Join outer from) row

@@ -256,7 +387,7 @@ instance

256387 , GroupedBy tab col bys

257388 , tys ~ '[ty]

258389 ) => IsLabel col

259− (NP (Expression outer commons ('Grouped bys) schemas params from) tys) where

390+ (NP (Expression outer ('Grouped bys) commons schemas params from) tys) where

260391 fromLabel = fromLabel @col :* Nil

261392instance

262393 ( HasUnique tab (Join outer from) row

@@ -264,7 +395,7 @@ instance

264395 , GroupedBy tab col bys

265396 , column ~ (col ::: ty)

266397 ) => IsLabel col

267− (Aliased (Expression outer commons ('Grouped bys) schemas params from) column) where

398+ (Aliased (Expression outer ('Grouped bys) commons schemas params from) column) where

268399 fromLabel = fromLabel @col `As` Alias

269400instance

270401 ( HasUnique tab (Join outer from) row

@@ -272,7 +403,7 @@ instance

272403 , GroupedBy tab col bys

273404 , columns ~ '[col ::: ty]

274405 ) => IsLabel col

275− (NP (Aliased (Expression outer commons ('Grouped bys) schemas params from)) columns) where

406+ (NP (Aliased (Expression outer ('Grouped bys) commons schemas params from)) columns) where

276407 fromLabel = fromLabel @col :* Nil

277408

278409instance

@@ -280,7 +411,7 @@ instance

280411 , Has col row ty

281412 , GroupedBy tab col bys

282413 ) => IsQualified tab col

283− (Expression outer commons ('Grouped bys) schemas params from ty) where

414+ (Expression outer ('Grouped bys) commons schemas params from ty) where

284415 tab ! col = UnsafeExpression $

285416 renderSQL tab <> "." <> renderSQL col

286417instance

@@ -289,7 +420,7 @@ instance

289420 , GroupedBy tab col bys

290421 , tys ~ '[ty]

291422 ) => IsQualified tab col

292− (NP (Expression outer commons ('Grouped bys) schemas params from) tys) where

423+ (NP (Expression outer ('Grouped bys) commons schemas params from) tys) where

293424 tab ! col = tab ! col :* Nil

294425instance

295426 ( Has tab (Join outer from) row

@@ -297,7 +428,7 @@ instance

297428 , GroupedBy tab col bys

298429 , column ~ (col ::: ty)

299430 ) => IsQualified tab col

300− (Aliased (Expression outer commons ('Grouped bys) schemas params from) column) where

431+ (Aliased (Expression outer ('Grouped bys) commons schemas params from) column) where

301432 tab ! col = tab ! col `As` col

302433instance

303434 ( Has tab (Join outer from) row

@@ -305,78 +436,239 @@ instance

305436 , GroupedBy tab col bys

306437 , columns ~ '[col ::: ty]

307438 ) => IsQualified tab col

308− (NP (Aliased (Expression outer commons ('Grouped bys) schemas params from)) columns) where

439+ (NP (Aliased (Expression outer ('Grouped bys) commons schemas params from)) columns) where

309440 tab ! col = tab ! col :* Nil

310441

442+-- | analagous to `Nothing`

443+--

444+-- >>> printSQL null_

445+-- NULL

446+null_ :: Expression outer grp commons schemas params from ('Null ty)

447+null_ = UnsafeExpression "NULL"

448+

449+-- | analagous to `Just`

450+--

451+-- >>> printSQL $ notNull true

452+-- TRUE

453+notNull

454+ :: Expression outer grp commons schemas params from ('NotNull ty)

455+ -> Expression outer grp commons schemas params from ('Null ty)

456+notNull = UnsafeExpression . renderSQL

457+

458+-- | return the leftmost value which is not NULL

459+--

460+-- >>> printSQL $ coalesce [null_, true] false

461+-- COALESCE(NULL, TRUE, FALSE)

462+coalesce

463+ :: [Expression outer grp commons schemas params from ('Null ty)]

464+ -- ^ @NULL@s may be present

465+ -> Expression outer grp commons schemas params from ('NotNull ty)

466+ -- ^ @NULL@ is absent

467+ -> Expression outer grp commons schemas params from ('NotNull ty)

468+coalesce nullxs notNullx = UnsafeExpression $

469+ "COALESCE" <> parenthesized (commaSeparated

470+ ((renderSQL <$> nullxs) <> [renderSQL notNullx]))

471+

472+-- | analagous to `Data.Maybe.fromMaybe` using @COALESCE@

473+--

474+-- >>> printSQL $ fromNull true null_

475+-- COALESCE(NULL, TRUE)

476+fromNull

477+ :: Expression outer grp commons schemas params from ('NotNull ty)

478+ -- ^ what to convert @NULL@ to

479+ -> Expression outer grp commons schemas params from ('Null ty)

480+ -> Expression outer grp commons schemas params from ('NotNull ty)

481+fromNull notNullx nullx = coalesce [nullx] notNullx

482+

483+-- | >>> printSQL $ null_ & isNull

484+-- NULL IS NULL

485+isNull

486+ :: Expression outer grp commons schemas params from ('Null ty)

487+ -- ^ possibly @NULL@

488+ -> Condition outer grp commons schemas params from

489+isNull x = UnsafeExpression $ renderSQL x <+> "IS NULL"

490+

491+-- | >>> printSQL $ null_ & isNotNull

492+-- NULL IS NOT NULL

493+isNotNull

494+ :: Expression outer grp commons schemas params from ('Null ty)

495+ -- ^ possibly @NULL@

496+ -> Condition outer grp commons schemas params from

497+isNotNull x = UnsafeExpression $ renderSQL x <+> "IS NOT NULL"

498+

499+-- | analagous to `maybe` using @IS NULL@

500+--

501+-- >>> printSQL $ matchNull true not_ null_

502+-- CASE WHEN NULL IS NULL THEN TRUE ELSE (NOT NULL) END

503+matchNull

504+ :: Expression outer grp commons schemas params from (nullty)

505+ -- ^ what to convert @NULL@ to

506+ -> ( Expression outer grp commons schemas params from ('NotNull ty)

507+ -> Expression outer grp commons schemas params from (nullty) )

508+ -- ^ function to perform when @NULL@ is absent

509+ -> Expression outer grp commons schemas params from ('Null ty)

510+ -> Expression outer grp commons schemas params from (nullty)

511+matchNull y f x = ifThenElse (isNull x) y

512+ (f (UnsafeExpression (renderSQL x)))

513+

514+{-| right inverse to `fromNull`, if its arguments are equal then

515+`nullIf` gives @NULL@.

516+

517+>>> :set -XTypeApplications -XDataKinds

518+>>> let expr = nullIf false (param @1) :: Expression outer grp commons schemas '[ 'NotNull 'PGbool] from ('Null 'PGbool)

519+>>> printSQL expr

520+NULL IF (FALSE, ($1 :: bool))

521+-}

522+nullIf

523+ :: Expression outer grp commons schemas params from ('NotNull ty)

524+ -- ^ @NULL@ is absent

525+ -> Expression outer grp commons schemas params from ('NotNull ty)

526+ -- ^ @NULL@ is absent

527+ -> Expression outer grp commons schemas params from ('Null ty)

528+nullIf x y = UnsafeExpression $ "NULL IF" <+> parenthesized

529+ (renderSQL x <> ", " <> renderSQL y)

530+

531+-- | >>> printSQL $ array [null_, false, true]

532+-- ARRAY[NULL, FALSE, TRUE]

533+array

534+ :: [Expression outer grp commons schemas params from ty]

535+ -- ^ array elements

536+ -> Expression outer grp commons schemas params from (nullity ('PGvararray ty))

537+array xs = UnsafeExpression $

538+ "ARRAY[" <> commaSeparated (renderSQL <$> xs) <> "]"

539+

540+-- | >>> printSQL $ cardinality (array [null_, false, true])

541+-- cardinality(ARRAY[NULL, FALSE, TRUE])

542+cardinality :: nullity ('PGvararray ty) :--> nullity 'PGint8

543+cardinality = unsafeFunction "cardinality"

544+

545+-- | >>> printSQL $ array [null_, false, true] & index 2

546+-- (ARRAY[NULL, FALSE, TRUE])[2]

547+index

548+ :: Word64 -- ^ index

549+ -> nullity ('PGvararray ty) -- ^ array

550+ :--> NullifyType ty

551+index n expr = UnsafeExpression $

552+ parenthesized (renderSQL expr) <> "[" <> fromString (show n) <> "]"

553+

311554instance (KnownSymbol label, label `In` labels) => IsPGlabel label

312− (Expression outer commons grp schemas params from (null ('PGenum labels))) where

555+ (Expression outer grp commons schemas params from (nullity ('PGenum labels))) where

313556 label = UnsafeExpression $ renderSQL (PGlabel @label)

314557

558+-- | A row constructor is an expression that builds a row value

559+-- (also called a composite value) using values for its member fields.

560+--

561+-- >>> :{

562+-- type Complex = 'PGcomposite

563+-- '[ "real" ::: 'NotNull 'PGfloat8

564+-- , "imaginary" ::: 'NotNull 'PGfloat8 ]

565+-- :}

566+--

567+-- >>> let i = row (0 `as` #real :* 1 `as` #imaginary) :: Expression outer grp commons schemas params from ('NotNull Complex)

568+-- >>> printSQL i

569+-- ROW(0, 1)

570+row

571+ :: SListI row

572+ => NP (Aliased (Expression outer grp commons schemas params from)) row

573+ -- ^ zero or more expressions for the row field values

574+ -> Expression outer grp commons schemas params from (nullity ('PGcomposite row))

575+row exprs = UnsafeExpression $ "ROW" <> parenthesized

576+ (renderCommaSeparated (\ (expr `As` _) -> renderSQL expr) exprs)

577+

578+-- | >>> :{

579+-- type Complex = 'PGcomposite

580+-- '[ "real" ::: 'NotNull 'PGfloat8

581+-- , "imaginary" ::: 'NotNull 'PGfloat8 ]

582+-- type Schema = '["complex" ::: 'Typedef Complex]

583+-- :}

584+--

585+-- >>> let i = row (0 `as` #real :* 1 `as` #imaginary) :: Expression outer grp '[] (Public Schema) from params ('NotNull Complex)

586+-- >>> printSQL $ i & field #complex #imaginary

587+-- (ROW(0, 1)::"complex")."imaginary"

588+field

589+ :: ( Has sch schemas schema

590+ , Has tydef schema ('Typedef ('PGcomposite row))

591+ , Has field row ty)

592+ => QualifiedAlias sch tydef -- ^ row type

593+ -> Alias field -- ^ field name

594+ -> Expression outer grp commons schemas params from ('NotNull ('PGcomposite row))

595+ -> Expression outer grp commons schemas params from ty

596+field td fld expr = UnsafeExpression $

597+ parenthesized (renderSQL expr <> "::" <> renderSQL td)

598+ <> "." <> renderSQL fld

599+

600+instance Semigroup

601+ (Expression outer grp commons schemas params from (nullity ('PGvararray ty))) where

602+ (<>) = unsafeBinaryOp "||"

603+

604+instance Monoid

605+ (Expression outer grp commons schemas params from (nullity ('PGvararray ty))) where

606+ mempty = array []

607+ mappend = (<>)

608+

609+-- | >>> let expr = greatest currentTimestamp [param @1] :: Expression outer grp commons schemas '[ 'NotNull 'PGtimestamptz] from ('NotNull 'PGtimestamptz)

610+-- >>> printSQL expr

611+-- GREATEST(CURRENT_TIMESTAMP, ($1 :: timestamp with time zone))

612+greatest

613+ :: Expression outer grp commons schemas params from (nullty)

614+ -- ^ needs at least 1 argument

615+ -> [Expression outer grp commons schemas params from (nullty)]

616+ -- ^ or more

617+ -> Expression outer grp commons schemas params from (nullty)

618+greatest x xs = UnsafeExpression $ "GREATEST("

619+ <> commaSeparated (renderSQL <$> (x:xs)) <> ")"

620+

621+-- | >>> printSQL $ least currentTimestamp [null_]

622+-- LEAST(CURRENT_TIMESTAMP, NULL)

623+least

624+ :: Expression outer grp commons schemas params from (nullty)

625+ -- ^ needs at least 1 argument

626+ -> [Expression outer grp commons schemas params from (nullty)]

627+ -- ^ or more

628+ -> Expression outer grp commons schemas params from (nullty)

629+least x xs = UnsafeExpression $ "LEAST("

630+ <> commaSeparated (renderSQL <$> (x:xs)) <> ")"

631+

315632-- | >>> printSQL $ unsafeBinaryOp "OR" true false

316633-- (TRUE OR FALSE)

317−unsafeBinaryOp :: ByteString -> Operator ty0 ty1 ty2

634+unsafeBinaryOp

635+ :: ByteString

636+ -- ^ operator

637+ -> Operator ty0 ty1 ty2

318638unsafeBinaryOp op x y = UnsafeExpression $ parenthesized $

319639 renderSQL x <+> op <+> renderSQL y

320640

321−binaryOp

322− :: forall op sch schemas schema x y z.

323− ( Has sch schemas schema

324− , Has op schema ('Operator ('BinaryOp x y z)) )

325− => OperatorDB schemas x y z

326−binaryOp = unsafeBinaryOp $ renderSymbol @op

327−

328−-- | >>> printSQL $ unsafeLeftOp "NOT" true

641+-- | >>> printSQL $ unsafeUnaryOp "NOT" true

329642-- (NOT TRUE)

330−unsafeLeftOp :: ByteString -> x --> y

331−unsafeLeftOp op x = UnsafeExpression $ parenthesized $ op <+> renderSQL x

332−

333−leftOp

334− :: forall op sch schemas schema x y.

335− ( Has sch schemas schema

336− , Has op schema ('Operator ('LeftOp x y)) )

337− => FunctionDB schemas x y

338−leftOp = unsafeLeftOp $ renderSymbol @op

339−

340−-- | >>> printSQL $ true & unsafeRightOp "IS NOT TRUE"

341−-- (TRUE IS NOT TRUE)

342−unsafeRightOp :: ByteString -> x --> y

343−unsafeRightOp op x = UnsafeExpression $ parenthesized $ renderSQL x <+> op

344−

345−rightOp

346− :: forall op sch schemas schema x y.

347− ( Has sch schemas schema

348− , Has op schema ('Operator ('RightOp x y)) )

349− => FunctionDB schemas x y

350−rightOp = unsafeRightOp $ renderSymbol @op

643+unsafeUnaryOp :: ByteString {- ^ operator -} -> x :--> y

644+unsafeUnaryOp op x = UnsafeExpression $ parenthesized $

645+ op <+> renderSQL x

351646

352647-- | >>> printSQL $ unsafeFunction "f" true

353648-- f(TRUE)

354−unsafeFunction :: ByteString -> x --> y

649+unsafeFunction :: ByteString {- ^ function -} -> x :--> y

355650unsafeFunction fun x = UnsafeExpression $

356651 fun <> parenthesized (renderSQL x)

357652

358−function

359− :: (Has sch schemas schema, Has fun schema ('Function ('[x] :=> 'Returns y)))

360− => QualifiedAlias sch fun

361− -> FunctionDB schemas x y

362−function = unsafeFunction . renderSQL

363−

364−-- | >>> printSQL $ unsafeFunctionN "f" (currentTime :* localTimestamp :* false *: literal 'a')

365−-- f(CURRENT_TIME, LOCALTIMESTAMP, FALSE, E'a')

366−unsafeFunctionN :: SListI xs => ByteString -> xs ---> y

367−unsafeFunctionN fun xs = UnsafeExpression $

653+unsafeFunctionHet

654+ :: SListI xs

655+ => ByteString {- ^ function -}

656+ -> FunctionHet xs y

657+unsafeFunctionHet fun xs = UnsafeExpression $

368658 fun <> parenthesized (renderCommaSeparated renderSQL xs)

369659

370−functionN

371− :: ( Has sch schemas schema

372− , Has fun schema ('Function (xs :=> 'Returns y))

373− , SListI xs )

374− => QualifiedAlias sch fun

375− -> FunctionNDB schemas xs y

376−functionN = unsafeFunctionN . renderSQL

660+-- | Helper for defining variadic functions.

661+unsafeVariadicFunction

662+ :: SListI elems

663+ => ByteString

664+ -- ^ function

665+ -> NP (Expression outer grp commons schemas params from) elems

666+ -> Expression outer grp commons schemas params from ret

667+unsafeVariadicFunction fun x = UnsafeExpression $

668+ fun <> parenthesized (commaSeparated (hcollapse (hmap (K . renderSQL) x)))

377669

378670instance ty `In` PGNum

379− => Num (Expression outer commons grp schemas params from (null ty)) where

671+ => Num (Expression outer grp commons schemas params from (nullity ty)) where

380672 (+) = unsafeBinaryOp "+"

381673 (-) = unsafeBinaryOp "-"

382674 (*) = unsafeBinaryOp "*"

@@ -388,7 +680,7 @@ instance ty `In` PGNum

388680 . show

389681

390682instance (ty `In` PGNum, ty `In` PGFloating) => Fractional

391− (Expression outer commons grp schemas params from (null ty)) where

683+ (Expression outer grp commons schemas params from (nullity ty)) where

392684 (/) = unsafeBinaryOp "/"

393685 fromRational

394686 = UnsafeExpression

@@ -398,7 +690,7 @@ instance (ty `In` PGNum, ty `In` PGFloating) => Fractional

398690 . fromRat @Double

399691

400692instance (ty `In` PGNum, ty `In` PGFloating) => Floating

401− (Expression outer commons grp schemas params from (null ty)) where

693+ (Expression outer grp commons schemas params from (nullity ty)) where

402694 pi = UnsafeExpression "pi()"

403695 exp = unsafeFunction "exp"

404696 log = unsafeFunction "ln"

@@ -419,54 +711,1839 @@ instance (ty `In` PGNum, ty `In` PGFloating) => Floating

419711 acosh x = log (x + sqrt (x*x - 1))

420712 atanh x = log ((1 + x) / (1 - x)) / 2

421713

422−-- | Contained by operators

423−class PGSubset ty where

424− (@>) :: Operator (null0 ty) (null1 ty) ('Null 'PGbool)

425− (@>) = unsafeBinaryOp "@>"

426− (<@) :: Operator (null0 ty) (null1 ty) ('Null 'PGbool)

427− (<@) = unsafeBinaryOp "<@"

428−instance PGSubset 'PGjsonb

429−instance PGSubset 'PGtsquery

430−instance PGSubset ('PGvararray ty)

431−instance PGSubset ('PGrange ty)

432−

433−class PGIntersect ty where

434− (@&&) :: Operator (null0 ty) (null1 ty) ('Null 'PGbool)

435− (@&&) = unsafeBinaryOp "&&"

436−instance PGIntersect ('PGvararray ty)

437−instance PGIntersect ('PGrange ty)

714+-- | >>> :{

715+-- let

716+-- expression :: Expression outer grp commons schemas params from (nullity 'PGfloat4)

717+-- expression = atan2_ pi 2

718+-- in printSQL expression

719+-- :}

720+-- atan2(pi(), 2)

721+atan2_

722+ :: float `In` PGFloating

723+ => Expression outer grp commons schemas params from (nullity float)

724+ -- ^ numerator

725+ -> Expression outer grp commons schemas params from (nullity float)

726+ -- ^ denominator

727+ -> Expression outer grp commons schemas params from (nullity float)

728+atan2_ y x = UnsafeExpression $

729+ "atan2(" <> renderSQL y <> ", " <> renderSQL x <> ")"

730+

731+-- When a `cast` is applied to an `Expression` of a known type, it

732+-- represents a run-time type conversion. The cast will succeed only if a

733+-- suitable type conversion operation has been defined.

734+--

735+-- | >>> printSQL $ true & cast int4

736+-- (TRUE :: int4)

737+cast

738+ :: TypeExpression schemas ty1

739+ -- ^ type to cast as

740+ -> Expression outer grp commons schemas params from ty0

741+ -- ^ value to convert

742+ -> Expression outer grp commons schemas params from ty1

743+cast ty x = UnsafeExpression $ parenthesized $

744+ renderSQL x <+> "::" <+> renderSQL ty

745+

746+-- | integer division, truncates the result

747+--

748+-- >>> :{

749+-- let

750+-- expression :: Expression outer grp commons schemas params from (nullity 'PGint2)

751+-- expression = 5 `quot_` 2

752+-- in printSQL expression

753+-- :}

754+-- (5 / 2)

755+quot_

756+ :: int `In` PGIntegral

757+ => Operator (nullity int) (nullity int) (nullity int)

758+quot_ = unsafeBinaryOp "/"

759+

760+-- | remainder upon integer division

761+--

762+-- >>> :{

763+-- let

764+-- expression :: Expression outer grp commons schemas params from (nullity 'PGint2)

765+-- expression = 5 `rem_` 2

766+-- in printSQL expression

767+-- :}

768+-- (5 % 2)

769+rem_

770+ :: int `In` PGIntegral

771+ => Operator (nullity int) (nullity int) (nullity int)

772+rem_ = unsafeBinaryOp "%"

773+

774+-- | >>> :{

775+-- let

776+-- expression :: Expression outer grp commons schemas params from (nullity 'PGfloat4)

777+-- expression = trunc pi

778+-- in printSQL expression

779+-- :}

780+-- trunc(pi())

781+trunc :: frac `In` PGFloating => nullity frac :--> nullity frac

782+trunc = unsafeFunction "trunc"

783+

784+-- | >>> :{

785+-- let

786+-- expression :: Expression outer grp commons schemas params from (nullity 'PGfloat4)

787+-- expression = round_ pi

788+-- in printSQL expression

789+-- :}

790+-- round(pi())

791+round_ :: frac `In` PGFloating => nullity frac :--> nullity frac

792+round_ = unsafeFunction "round"

793+

794+-- | >>> :{

795+-- let

796+-- expression :: Expression outer grp commons schemas params from (nullity 'PGfloat4)

797+-- expression = ceiling_ pi

798+-- in printSQL expression

799+-- :}

800+-- ceiling(pi())

801+ceiling_ :: frac `In` PGFloating => nullity frac :--> nullity frac

802+ceiling_ = unsafeFunction "ceiling"

803+

804+-- | A `Condition` is an `Expression`, which can evaluate

805+-- to `true`, `false` or `null_`. This is because SQL uses

806+-- a three valued logic.

807+type Condition outer grp commons schemas params from =

808+ Expression outer grp commons schemas params from ('Null 'PGbool)

809+

810+-- | >>> printSQL true

811+-- TRUE

812+true :: Expression outer grp commons schemas params from (nullity 'PGbool)

813+true = UnsafeExpression "TRUE"

814+

815+-- | >>> printSQL false

816+-- FALSE

817+false :: Expression outer grp commons schemas params from (nullity 'PGbool)

818+false = UnsafeExpression "FALSE"

819+

820+-- | >>> printSQL $ not_ true

821+-- (NOT TRUE)

822+not_ :: nullity 'PGbool :--> nullity 'PGbool

823+not_ = unsafeUnaryOp "NOT"

824+

825+-- | >>> printSQL $ true .&& false

826+-- (TRUE AND FALSE)

827+(.&&) :: Operator (nullity 'PGbool) (nullity 'PGbool) (nullity 'PGbool)

828+infixr 3 .&&

829+(.&&) = unsafeBinaryOp "AND"

830+

831+-- | >>> printSQL $ true .|| false

832+-- (TRUE OR FALSE)

833+(.||) :: Operator (nullity 'PGbool) (nullity 'PGbool) (nullity 'PGbool)

834+infixr 2 .||

835+(.||) = unsafeBinaryOp "OR"

836+

837+-- | >>> :{

838+-- let

839+-- expression :: Expression outer grp commons schemas params from (nullity 'PGint2)

840+-- expression = caseWhenThenElse [(true, 1), (false, 2)] 3

841+-- in printSQL expression

842+-- :}

843+-- CASE WHEN TRUE THEN 1 WHEN FALSE THEN 2 ELSE 3 END

844+caseWhenThenElse

845+ :: [ ( Condition outer grp commons schemas params from

846+ , Expression outer grp commons schemas params from ty

847+ ) ]

848+ -- ^ whens and thens

849+ -> Expression outer grp commons schemas params from ty

850+ -- ^ else

851+ -> Expression outer grp commons schemas params from ty

852+caseWhenThenElse whenThens else_ = UnsafeExpression $ mconcat

853+ [ "CASE"

854+ , mconcat

855+ [ mconcat

856+ [ " WHEN ", renderSQL when_

857+ , " THEN ", renderSQL then_

858+ ]

859+ | (when_,then_) <- whenThens

860+ ]

861+ , " ELSE ", renderSQL else_

862+ , " END"

863+ ]

864+

865+-- | >>> :{

866+-- let

867+-- expression :: Expression outer grp commons schemas params from (nullity 'PGint2)

868+-- expression = ifThenElse true 1 0

869+-- in printSQL expression

870+-- :}

871+-- CASE WHEN TRUE THEN 1 ELSE 0 END

872+ifThenElse

873+ :: Condition outer grp commons schemas params from

874+ -> Expression outer grp commons schemas params from ty -- ^ then

875+ -> Expression outer grp commons schemas params from ty -- ^ else

876+ -> Expression outer grp commons schemas params from ty

877+ifThenElse if_ then_ else_ = caseWhenThenElse [(if_,then_)] else_

878+

879+-- | Comparison operations like `.==`, `./=`, `.>`, `.>=`, `.<` and `.<=`

880+-- will produce @NULL@s if one of their arguments is @NULL@.

881+--

882+-- >>> printSQL $ true .== null_

883+-- (TRUE = NULL)

884+(.==) :: Operator (nullity0 ty) (nullity1 ty) ('Null 'PGbool)

885+(.==) = unsafeBinaryOp "="

886+infix 4 .==

887+

888+-- | >>> printSQL $ true ./= null_

889+-- (TRUE <> NULL)

890+(./=) :: Operator (nullity0 ty) (nullity1 ty) ('Null 'PGbool)

891+(./=) = unsafeBinaryOp "<>"

892+infix 4 ./=

893+

894+-- | >>> printSQL $ true .>= null_

895+-- (TRUE >= NULL)

896+(.>=) :: Operator (nullity0 ty) (nullity1 ty) ('Null 'PGbool)

897+(.>=) = unsafeBinaryOp ">="

898+infix 4 .>=

899+

900+-- | >>> printSQL $ true .< null_

901+-- (TRUE < NULL)

902+(.<) :: Operator (nullity0 ty) (nullity1 ty) ('Null 'PGbool)

903+(.<) = unsafeBinaryOp "<"

904+infix 4 .<

905+

906+-- | >>> printSQL $ true .<= null_

907+-- (TRUE <= NULL)

908+(.<=) :: Operator (nullity0 ty) (nullity1 ty) ('Null 'PGbool)

909+(.<=) = unsafeBinaryOp "<="

910+infix 4 .<=

911+

912+-- | >>> printSQL $ true .> null_

913+-- (TRUE > NULL)

914+(.>) :: Operator (nullity0 ty) (nullity1 ty) ('Null 'PGbool)

915+(.>) = unsafeBinaryOp ">"

916+infix 4 .>

917+

918+{- | between

919+>>> printSQL $ true `between` (null_, false)

920+TRUE BETWEEN NULL AND FALSE

921+-}

922+between

923+ :: Expression outer grp commons schemas params from (nullity ty)

924+ -> ( Expression outer grp commons schemas params from (nullity ty)

925+ , Expression outer grp commons schemas params from (nullity ty) ) -- ^ bounds

926+ -> Condition outer grp commons schemas params from

927+between a (x,y) = UnsafeExpression $ renderSQL a <+> "BETWEEN"

928+ <+> renderSQL x <+> "AND" <+> renderSQL y

929+

930+{- | not between

931+>>> printSQL $ true `notBetween` (null_, false)

932+TRUE NOT BETWEEN NULL AND FALSE

933+-}

934+notBetween

935+ :: Expression outer grp commons schemas params from (nullity ty)

936+ -> ( Expression outer grp commons schemas params from (nullity ty)

937+ , Expression outer grp commons schemas params from (nullity ty) ) -- ^ bounds

938+ -> Condition outer grp commons schemas params from

939+notBetween a (x,y) = UnsafeExpression $ renderSQL a <+> "NOT BETWEEN"

940+ <+> renderSQL x <+> "AND" <+> renderSQL y

941+

942+{- | between, after sorting the comparison values

943+>>> printSQL $ true `betweenSymmetric` (null_, false)

944+TRUE BETWEEN SYMMETRIC NULL AND FALSE

945+-}

946+betweenSymmetric

947+ :: Expression outer grp commons schemas params from (nullity ty)

948+ -> ( Expression outer grp commons schemas params from (nullity ty)

949+ , Expression outer grp commons schemas params from (nullity ty) ) -- ^ bounds

950+ -> Condition outer grp commons schemas params from

951+betweenSymmetric a (x,y) = UnsafeExpression $ renderSQL a

952+ <+> "BETWEEN SYMMETRIC" <+> renderSQL x <+> "AND" <+> renderSQL y

953+

954+{- | not between, after sorting the comparison values

955+>>> printSQL $ true `notBetweenSymmetric` (null_, false)

956+TRUE NOT BETWEEN SYMMETRIC NULL AND FALSE

957+-}

958+notBetweenSymmetric

959+ :: Expression outer grp commons schemas params from (nullity ty)

960+ -> ( Expression outer grp commons schemas params from (nullity ty)

961+ , Expression outer grp commons schemas params from (nullity ty) ) -- ^ bounds

962+ -> Condition outer grp commons schemas params from

963+notBetweenSymmetric a (x,y) = UnsafeExpression $ renderSQL a

964+ <+> "NOT BETWEEN SYMMETRIC" <+> renderSQL x <+> "AND" <+> renderSQL y

965+

966+{- | not equal, treating null like an ordinary value

967+>>> printSQL $ true `isDistinctFrom` null_

968+(TRUE IS DISTINCT FROM NULL)

969+-}

970+isDistinctFrom :: Operator (nullity0 ty) (nullity1 ty) ('Null 'PGbool)

971+isDistinctFrom = unsafeBinaryOp "IS DISTINCT FROM"

972+

973+{- | equal, treating null like an ordinary value

974+>>> printSQL $ true `isNotDistinctFrom` null_

975+(TRUE IS NOT DISTINCT FROM NULL)

976+-}

977+isNotDistinctFrom :: Operator (nullity0 ty) (nullity1 ty) ('Null 'PGbool)

978+isNotDistinctFrom = unsafeBinaryOp "IS NOT DISTINCT FROM"

979+

980+{- | is true

981+>>> printSQL $ true & isTrue

982+TRUE IS TRUE

983+-}

984+isTrue

985+ :: Expression outer grp commons schemas params from (nullity 'PGbool)

986+ -> Condition outer grp commons schemas params from

987+isTrue b = UnsafeExpression $ renderSQL b <+> "IS TRUE"

988+

989+{- | is false or unknown

990+>>> printSQL $ true & isNotTrue

991+TRUE IS NOT TRUE

992+-}

993+isNotTrue

994+ :: Expression outer grp commons schemas params from (nullity 'PGbool)

995+ -> Condition outer grp commons schemas params from

996+isNotTrue b = UnsafeExpression $ renderSQL b <+> "IS NOT TRUE"

997+

998+{- | is false

999+>>> printSQL $ true & isFalse

1000+TRUE IS FALSE

1001+-}

1002+isFalse

1003+ :: Expression outer grp commons schemas params from (nullity 'PGbool)

1004+ -> Condition outer grp commons schemas params from

1005+isFalse b = UnsafeExpression $ renderSQL b <+> "IS FALSE"

1006+

1007+{- | is true or unknown

1008+>>> printSQL $ true & isNotFalse

1009+TRUE IS NOT FALSE

1010+-}

1011+isNotFalse

1012+ :: Expression outer grp commons schemas params from (nullity 'PGbool)

1013+ -> Condition outer grp commons schemas params from

1014+isNotFalse b = UnsafeExpression $ renderSQL b <+> "IS NOT FALSE"

1015+

1016+{- | is unknown

1017+>>> printSQL $ true & isUnknown

1018+TRUE IS UNKNOWN

1019+-}

1020+isUnknown

1021+ :: Expression outer grp commons schemas params from (nullity 'PGbool)

1022+ -> Condition outer grp commons schemas params from

1023+isUnknown b = UnsafeExpression $ renderSQL b <+> "IS UNKNOWN"

1024+

1025+{- | is true or false

1026+>>> printSQL $ true & isNotUnknown

1027+TRUE IS NOT UNKNOWN

1028+-}

1029+isNotUnknown

1030+ :: Expression outer grp commons schemas params from (nullity 'PGbool)

1031+ -> Condition outer grp commons schemas params from

1032+isNotUnknown b = UnsafeExpression $ renderSQL b <+> "IS NOT UNKNOWN"

1033+

1034+-- | >>> printSQL currentDate

1035+-- CURRENT_DATE

1036+currentDate

1037+ :: Expression outer grp commons schemas params from (nullity 'PGdate)

1038+currentDate = UnsafeExpression "CURRENT_DATE"

1039+

1040+-- | >>> printSQL currentTime

1041+-- CURRENT_TIME

1042+currentTime

1043+ :: Expression outer grp commons schemas params from (nullity 'PGtimetz)

1044+currentTime = UnsafeExpression "CURRENT_TIME"

1045+

1046+-- | >>> printSQL currentTimestamp

1047+-- CURRENT_TIMESTAMP

1048+currentTimestamp

1049+ :: Expression outer grp commons schemas params from (nullity 'PGtimestamptz)

1050+currentTimestamp = UnsafeExpression "CURRENT_TIMESTAMP"

1051+

1052+-- | >>> printSQL localTime

1053+-- LOCALTIME

1054+localTime

1055+ :: Expression outer grp commons schemas params from (nullity 'PGtime)

1056+localTime = UnsafeExpression "LOCALTIME"

1057+

1058+-- | >>> printSQL localTimestamp

1059+-- LOCALTIMESTAMP

1060+localTimestamp

1061+ :: Expression outer grp commons schemas params from (nullity 'PGtimestamp)

1062+localTimestamp = UnsafeExpression "LOCALTIMESTAMP"

1063+

1064+{-----------------------------------------

1065+text

1066+-----------------------------------------}

1067+

1068+escape :: Char -> String

1069+escape = \case

1070+ '\NUL' -> "\\0"

1071+ '\'' -> "''"

1072+ '"' -> "\\\""

1073+ '\b' -> "\\b"

1074+ '\n' -> "\\n"

1075+ '\r' -> "\\r"

1076+ '\t' -> "\\t"

1077+ '\\' -> "\\\\"

1078+ c -> [c]

4381079

4391080instance IsString

440− (Expression outer commons grp schemas params from (null 'PGtext)) where

1081+ (Expression outer grp commons schemas params from (nullity 'PGtext)) where

4411082 fromString str = UnsafeExpression $

4421083 "E\'" <> fromString (escape =<< str) <> "\'"

4431084instance IsString

444− (Expression outer commons grp schemas params from (null 'PGtsvector)) where

445− fromString str = UnsafeExpression . parenthesized . (<> " :: tsvector") $

1085+ (Expression outer grp commons schemas params from (nullity 'PGtsvector)) where

1086+ fromString str = cast tsvector . UnsafeExpression $

4461087 "E\'" <> fromString (escape =<< str) <> "\'"

4471088instance IsString

448− (Expression outer commons grp schemas params from (null 'PGtsquery)) where

449− fromString str = UnsafeExpression . parenthesized . (<> " :: tsquery") $

1089+ (Expression outer grp commons schemas params from (nullity 'PGtsquery)) where

1090+ fromString str = cast tsquery . UnsafeExpression $

4501091 "E\'" <> fromString (escape =<< str) <> "\'"

4511092

4521093instance Semigroup

453− (Expression outer commons grp schemas params from (null ('PGvararray ty))) where

454− (<>) = unsafeBinaryOp "||"

455−instance Semigroup

456− (Expression outer commons grp schemas params from (null 'PGjsonb)) where

1094+ (Expression outer grp commons schemas params from (nullity 'PGtext)) where

4571095 (<>) = unsafeBinaryOp "||"

4581096instance Semigroup

459− (Expression outer commons grp schemas params from (null 'PGtext)) where

460− (<>) = unsafeBinaryOp "||"

461−instance Semigroup

462− (Expression outer commons grp schemas params from (null 'PGtsvector)) where

1097+ (Expression outer grp commons schemas params from (nullity 'PGtsvector)) where

4631098 (<>) = unsafeBinaryOp "||"

4641099

4651100instance Monoid

466− (Expression outer commons grp schemas params from (null 'PGtext)) where

1101+ (Expression outer grp commons schemas params from (nullity 'PGtext)) where

4671102 mempty = fromString ""

4681103 mappend = (<>)

4691104instance Monoid

470− (Expression outer commons grp schemas params from (null 'PGtsvector)) where

1105+ (Expression outer grp commons schemas params from (nullity 'PGtsvector)) where

4711106 mempty = fromString ""

4721107 mappend = (<>)

1108+

1109+-- | >>> printSQL $ lower "ARRRGGG"

1110+-- lower(E'ARRRGGG')

1111+lower

1112+ :: nullity 'PGtext

1113+ -- ^ string to lower case

1114+ :--> nullity 'PGtext

1115+lower = unsafeFunction "lower"

1116+

1117+-- | >>> printSQL $ upper "eeee"

1118+-- upper(E'eeee')

1119+upper

1120+ :: nullity 'PGtext

1121+ -- ^ string to upper case

1122+ :--> nullity 'PGtext

1123+upper = unsafeFunction "upper"

1124+

1125+-- | >>> printSQL $ charLength "four"

1126+-- char_length(E'four')

1127+charLength

1128+ :: nullity 'PGtext

1129+ -- ^ string to measure

1130+ :--> nullity 'PGint4

1131+charLength = unsafeFunction "char_length"

1132+

1133+-- | The `like` expression returns true if the @string@ matches

1134+-- the supplied @pattern@. If @pattern@ does not contain percent signs

1135+-- or underscores, then the pattern only represents the string itself;

1136+-- in that case `like` acts like the equals operator. An underscore (_)

1137+-- in pattern stands for (matches) any single character; a percent sign (%)

1138+-- matches any sequence of zero or more characters.

1139+--

1140+-- >>> printSQL $ "abc" `like` "a%"

1141+-- (E'abc' LIKE E'a%')

1142+like :: Operator (nullity 'PGtext) (nullity 'PGtext) ('Null 'PGbool)

1143+like = unsafeBinaryOp "LIKE"

1144+

1145+-- | The key word ILIKE can be used instead of LIKE to make the

1146+-- match case-insensitive according to the active locale.

1147+--

1148+-- >>> printSQL $ "abc" `ilike` "a%"

1149+-- (E'abc' ILIKE E'a%')

1150+ilike :: Operator (nullity 'PGtext) (nullity 'PGtext) ('Null 'PGbool)

1151+ilike = unsafeBinaryOp "ILIKE"

1152+

1153+{-----------------------------------------

1154+ -- json and jsonb support

1155+

1156+See https://www.postgresql.org/docs/10/static/functions-json.html -- most

1157+comments lifted directly from this page.

1158+

1159+Table 9.44: json and jsonb operators

1160+-----------------------------------------}

1161+

1162+-- | Get JSON value (object field or array element) at a key.

1163+(.->)

1164+ :: (json `In` PGJsonType, key `In` PGJsonKey)

1165+ => Operator (nullity json) (nullity key) ('Null json)

1166+infixl 8 .->

1167+(.->) = unsafeBinaryOp "->"

1168+

1169+-- | Get JSON value (object field or array element) at a key, as text.

1170+(.->>)

1171+ :: (json `In` PGJsonType, key `In` PGJsonKey)

1172+ => Operator (nullity json) (nullity key) ('Null 'PGtext)

1173+infixl 8 .->>

1174+(.->>) = unsafeBinaryOp "->>"

1175+

1176+-- | Get JSON value at a specified path.

1177+(.#>)

1178+ :: (json `In` PGJsonType, PGTextArray "(.#>)" path)

1179+ => Operator (nullity json) (nullity path) ('Null json)

1180+infixl 8 .#>

1181+(.#>) = unsafeBinaryOp "#>"

1182+

1183+-- | Get JSON value at a specified path as text.

1184+(.#>>)

1185+ :: (json `In` PGJsonType, PGTextArray "(.#>>)" path)

1186+ => Operator (nullity json) (nullity path) ('Null 'PGtext)

1187+infixl 8 .#>>

1188+(.#>>) = unsafeBinaryOp "#>>"

1189+

1190+-- Additional jsonb operators

1191+

1192+-- | Does the left JSON value contain the right JSON path/value entries at the

1193+-- top level?

1194+(.@>)

1195+ :: Operator (nullity 'PGjsonb) (nullity 'PGjsonb) ('Null 'PGbool)

1196+infixl 9 .@>

1197+(.@>) = unsafeBinaryOp "@>"

1198+

1199+-- | Are the left JSON path/value entries contained at the top level within the

1200+-- right JSON value?

1201+(.<@) :: Operator (nullity 'PGjsonb) (nullity 'PGjsonb) ('Null 'PGbool)

1202+infixl 9 .<@

1203+(.<@) = unsafeBinaryOp "<@"

1204+

1205+-- | Does the string exist as a top-level key within the JSON value?

1206+(.?) :: Operator (nullity 'PGjsonb) (nullity 'PGtext) ('Null 'PGbool)

1207+infixl 9 .?

1208+(.?) = unsafeBinaryOp "?"

1209+

1210+-- | Do any of these array strings exist as top-level keys?

1211+(.?|) :: Operator

1212+ (nullity 'PGjsonb)

1213+ (nullity ('PGvararray ('NotNull 'PGtext)))

1214+ ('Null 'PGbool)

1215+infixl 9 .?|

1216+(.?|) = unsafeBinaryOp "?|"

1217+

1218+-- | Do all of these array strings exist as top-level keys?

1219+(.?&) :: Operator

1220+ (nullity 'PGjsonb)

1221+ (nullity ('PGvararray ('NotNull 'PGtext)))

1222+ ('Null 'PGbool)

1223+infixl 9 .?&

1224+(.?&) = unsafeBinaryOp "?&"

1225+

1226+-- | Concatenate two jsonb values into a new jsonb value.

1227+instance Semigroup

1228+ (Expression outer grp commons schemas params from (nullity 'PGjsonb)) where

1229+ (<>) = unsafeBinaryOp "||"

1230+

1231+-- | Delete a key or keys from a JSON object, or remove an array element.

1232+--

1233+-- If the right operand is..

1234+--

1235+-- @ text @: Delete key/value pair or string element from left operand. Key/value pairs

1236+-- are matched based on their key value.

1237+--

1238+-- @ text[] @: Delete multiple key/value pairs or string elements

1239+-- from left operand. Key/value pairs are matched based on their key value.

1240+--

1241+-- @ integer @: Delete the array element with specified index (Negative integers

1242+-- count from the end). Throws an error if top level container is not an array.

1243+(.-.)

1244+ :: (key `In` '[ 'PGtext, 'PGvararray ('NotNull 'PGtext), 'PGint4, 'PGint2 ]) -- hlint error without parens here

1245+ => Operator (nullity 'PGjsonb) (nullity key) (nullity 'PGjsonb)

1246+infixl 6 .-.

1247+(.-.) = unsafeBinaryOp "-"

1248+

1249+-- | Delete the field or element with specified path (for JSON arrays, negative

1250+-- integers count from the end)

1251+(#-.)

1252+ :: PGTextArray "(#-.)" arrayty

1253+ => Operator (nullity 'PGjsonb) (nullity arrayty)(nullity 'PGjsonb)

1254+infixl 6 #-.

1255+(#-.) = unsafeBinaryOp "#-"

1256+

1257+{-----------------------------------------

1258+Table 9.45: JSON creation functions

1259+-----------------------------------------}

1260+

1261+-- | Literal binary JSON

1262+jsonbLit

1263+ :: JSON.ToJSON x

1264+ => x -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1265+jsonbLit = cast jsonb . UnsafeExpression

1266+ . singleQuotedUtf8 . toStrict . JSON.encode

1267+

1268+-- | Literal JSON

1269+jsonLit

1270+ :: JSON.ToJSON x

1271+ => x -> Expression outer grp commons schemas params from (nullity 'PGjson)

1272+jsonLit = cast json . UnsafeExpression

1273+ . singleQuotedUtf8 . toStrict . JSON.encode

1274+

1275+-- | Returns the value as json. Arrays and composites are converted

1276+-- (recursively) to arrays and objects; otherwise, if there is a cast from the

1277+-- type to json, the cast function will be used to perform the conversion;

1278+-- otherwise, a scalar value is produced. For any scalar type other than a

1279+-- number, a Boolean, or a null value, the text representation will be used, in

1280+-- such a fashion that it is a valid json value.

1281+toJson :: nullity ty :--> nullity 'PGjson

1282+toJson = unsafeFunction "to_json"

1283+

1284+-- | Returns the value as jsonb. Arrays and composites are converted

1285+-- (recursively) to arrays and objects; otherwise, if there is a cast from the

1286+-- type to json, the cast function will be used to perform the conversion;

1287+-- otherwise, a scalar value is produced. For any scalar type other than a

1288+-- number, a Boolean, or a null value, the text representation will be used, in

1289+-- such a fashion that it is a valid jsonb value.

1290+toJsonb :: nullity ty :--> nullity 'PGjsonb

1291+toJsonb = unsafeFunction "to_jsonb"

1292+

1293+-- | Returns the array as a JSON array. A PostgreSQL multidimensional array

1294+-- becomes a JSON array of arrays.

1295+arrayToJson

1296+ :: PGArray "arrayToJson" arr

1297+ => nullity arr :--> nullity 'PGjson

1298+arrayToJson = unsafeFunction "array_to_json"

1299+

1300+-- | Returns the row as a JSON object.

1301+rowToJson :: nullity ('PGcomposite ty) :--> nullity 'PGjson

1302+rowToJson = unsafeFunction "row_to_json"

1303+

1304+-- | Builds a possibly-heterogeneously-typed JSON array out of a variadic

1305+-- argument list.

1306+jsonBuildArray

1307+ :: SListI elems

1308+ => NP (Expression outer grp commons schemas params from) elems

1309+ -> Expression outer grp commons schemas params from (nullity 'PGjson)

1310+jsonBuildArray = unsafeVariadicFunction "json_build_array"

1311+

1312+-- | Builds a possibly-heterogeneously-typed (binary) JSON array out of a

1313+-- variadic argument list.

1314+jsonbBuildArray

1315+ :: SListI elems

1316+ => NP (Expression outer grp commons schemas params from) elems

1317+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1318+jsonbBuildArray = unsafeVariadicFunction "jsonb_build_array"

1319+

1320+unsafeRowFunction

1321+ :: SOP.SListI elems

1322+ => NP (Aliased (Expression outer grp commons schemas params from)) elems

1323+ -> [ByteString]

1324+unsafeRowFunction =

1325+ (`appEndo` []) . hcfoldMap (Proxy :: SOP.Proxy SOP.Top)

1326+ (\(col `As` name) -> Endo $ \xs ->

1327+ renderAliasString name : renderSQL col : xs)

1328+ where

1329+ renderAliasString :: KnownSymbol alias => Alias alias -> ByteString

1330+ renderAliasString = singleQuotedText . fromString . symbolVal

1331+

1332+-- | Builds a possibly-heterogeneously-typed JSON object out of a variadic

1333+-- argument list. The elements of the argument list must alternate between text

1334+-- and values.

1335+jsonBuildObject

1336+ :: SOP.SListI elems

1337+ => NP (Aliased (Expression outer grp commons schemas params from)) elems

1338+ -> Expression outer grp commons schemas params from (nullity 'PGjson)

1339+jsonBuildObject

1340+ = unsafeFunction "json_build_object"

1341+ . UnsafeExpression

1342+ . commaSeparated

1343+ . unsafeRowFunction

1344+

1345+-- | Builds a possibly-heterogeneously-typed (binary) JSON object out of a

1346+-- variadic argument list. The elements of the argument list must alternate

1347+-- between text and values.

1348+jsonbBuildObject

1349+ :: SOP.SListI elems

1350+ => NP (Aliased (Expression outer grp commons schemas params from)) elems

1351+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1352+jsonbBuildObject

1353+ = unsafeFunction "jsonb_build_object"

1354+ . UnsafeExpression

1355+ . commaSeparated

1356+ . unsafeRowFunction

1357+

1358+-- | Builds a JSON object out of a text array. The array must have either

1359+-- exactly one dimension with an even number of members, in which case they are

1360+-- taken as alternating key/value pairs, or two dimensions such that each inner

1361+-- array has exactly two elements, which are taken as a key/value pair.

1362+jsonObject

1363+ :: PGArrayOf "jsonObject" arr ('NotNull 'PGtext)

1364+ => nullity arr :--> nullity 'PGjson

1365+jsonObject = unsafeFunction "json_object"

1366+

1367+-- | Builds a binary JSON object out of a text array. The array must have either

1368+-- exactly one dimension with an even number of members, in which case they are

1369+-- taken as alternating key/value pairs, or two dimensions such that each inner

1370+-- array has exactly two elements, which are taken as a key/value pair.

1371+jsonbObject

1372+ :: PGArrayOf "jsonbObject" arr ('NotNull 'PGtext)

1373+ => nullity arr :--> nullity 'PGjsonb

1374+jsonbObject = unsafeFunction "jsonb_object"

1375+

1376+-- | This is an alternate form of 'jsonObject' that takes two arrays; one for

1377+-- keys and one for values, that are zipped pairwise to create a JSON object.

1378+jsonZipObject

1379+ :: ( PGArrayOf "jsonZipObject" keysArray ('NotNull 'PGtext)

1380+ , PGArrayOf "jsonZipObject" valuesArray ('NotNull 'PGtext))

1381+ => Expression outer grp commons schemas params from (nullity keysArray)

1382+ -> Expression outer grp commons schemas params from (nullity valuesArray)

1383+ -> Expression outer grp commons schemas params from (nullity 'PGjson)

1384+jsonZipObject ks vs =

1385+ unsafeVariadicFunction "json_object" (ks :* vs :* Nil)

1386+

1387+-- | This is an alternate form of 'jsonObject' that takes two arrays; one for

1388+-- keys and one for values, that are zipped pairwise to create a binary JSON

1389+-- object.

1390+jsonbZipObject

1391+ :: ( PGArrayOf "jsonbZipObject" keysArray ('NotNull 'PGtext)

1392+ , PGArrayOf "jsonbZipObject" valuesArray ('NotNull 'PGtext))

1393+ => Expression outer grp commons schemas params from (nullity keysArray)

1394+ -> Expression outer grp commons schemas params from (nullity valuesArray)

1395+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1396+jsonbZipObject ks vs =

1397+ unsafeVariadicFunction "jsonb_object" (ks :* vs :* Nil)

1398+

1399+{-----------------------------------------

1400+Table 9.46: JSON processing functions

1401+-----------------------------------------}

1402+

1403+-- | Returns the number of elements in the outermost JSON array.

1404+jsonArrayLength :: nullity 'PGjson :--> nullity 'PGint4

1405+jsonArrayLength = unsafeFunction "json_array_length"

1406+

1407+-- | Returns the number of elements in the outermost binary JSON array.

1408+jsonbArrayLength :: nullity 'PGjsonb :--> nullity 'PGint4

1409+jsonbArrayLength = unsafeFunction "jsonb_array_length"

1410+

1411+-- | Returns JSON value pointed to by the given path (equivalent to #>

1412+-- operator).

1413+jsonExtractPath

1414+ :: SListI elems

1415+ => Expression outer grp commons schemas params from (nullity 'PGjson)

1416+ -> NP (Expression outer grp commons schemas params from) elems

1417+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1418+jsonExtractPath x xs =

1419+ unsafeVariadicFunction "json_extract_path" (x :* xs)

1420+

1421+-- | Returns JSON value pointed to by the given path (equivalent to #>

1422+-- operator).

1423+jsonbExtractPath

1424+ :: SListI elems

1425+ => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1426+ -> NP (Expression outer grp commons schemas params from) elems

1427+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1428+jsonbExtractPath x xs =

1429+ unsafeVariadicFunction "jsonb_extract_path" (x :* xs)

1430+

1431+-- | Returns JSON value pointed to by the given path (equivalent to #>

1432+-- operator), as text.

1433+jsonExtractPathAsText

1434+ :: SListI elems

1435+ => Expression outer grp commons schemas params from (nullity 'PGjson)

1436+ -> NP (Expression outer grp commons schemas params from) elems

1437+ -> Expression outer grp commons schemas params from (nullity 'PGjson)

1438+jsonExtractPathAsText x xs =

1439+ unsafeVariadicFunction "json_extract_path_text" (x :* xs)

1440+

1441+-- | Returns JSON value pointed to by the given path (equivalent to #>

1442+-- operator), as text.

1443+jsonbExtractPathAsText

1444+ :: SListI elems

1445+ => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1446+ -> NP (Expression outer grp commons schemas params from) elems

1447+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1448+jsonbExtractPathAsText x xs =

1449+ unsafeVariadicFunction "jsonb_extract_path_text" (x :* xs)

1450+

1451+-- | Returns the type of the outermost JSON value as a text string. Possible

1452+-- types are object, array, string, number, boolean, and null.

1453+jsonTypeof :: nullity 'PGjson :--> nullity 'PGtext

1454+jsonTypeof = unsafeFunction "json_typeof"

1455+

1456+-- | Returns the type of the outermost binary JSON value as a text string.

1457+-- Possible types are object, array, string, number, boolean, and null.

1458+jsonbTypeof :: nullity 'PGjsonb :--> nullity 'PGtext

1459+jsonbTypeof = unsafeFunction "jsonb_typeof"

1460+

1461+-- | Returns its argument with all object fields that have null values omitted.

1462+-- Other null values are untouched.

1463+jsonStripNulls :: nullity 'PGjson :--> nullity 'PGjson

1464+jsonStripNulls = unsafeFunction "json_strip_nulls"

1465+

1466+-- | Returns its argument with all object fields that have null values omitted.

1467+-- Other null values are untouched.

1468+jsonbStripNulls :: nullity 'PGjsonb :--> nullity 'PGjsonb

1469+jsonbStripNulls = unsafeFunction "jsonb_strip_nulls"

1470+

1471+-- | @ jsonbSet target path new_value create_missing @

1472+--

1473+-- Returns target with the section designated by path replaced by new_value,

1474+-- or with new_value added if create_missing is true ( default is true) and the

1475+-- item designated by path does not exist. As with the path orientated

1476+-- operators, negative integers that appear in path count from the end of JSON

1477+-- arrays.

1478+jsonbSet

1479+ :: PGTextArray "jsonbSet" arr

1480+ => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1481+ -> Expression outer grp commons schemas params from (nullity arr)

1482+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1483+ -> Maybe (Expression outer grp commons schemas params from (nullity 'PGbool))

1484+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1485+jsonbSet tgt path val createMissing = case createMissing of

1486+ Just m -> unsafeVariadicFunction "jsonb_set" (tgt :* path :* val :* m :* Nil)

1487+ Nothing -> unsafeVariadicFunction "jsonb_set" (tgt :* path :* val :* Nil)

1488+

1489+-- | @ jsonbInsert target path new_value insert_after @

1490+--

1491+-- Returns target with new_value inserted. If target section designated by

1492+-- path is in a JSONB array, new_value will be inserted before target or after

1493+-- if insert_after is true (default is false). If target section designated by

1494+-- path is in JSONB object, new_value will be inserted only if target does not

1495+-- exist. As with the path orientated operators, negative integers that appear

1496+-- in path count from the end of JSON arrays.

1497+jsonbInsert

1498+ :: PGTextArray "jsonbInsert" arr

1499+ => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1500+ -> Expression outer grp commons schemas params from (nullity arr)

1501+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1502+ -> Maybe (Expression outer grp commons schemas params from (nullity 'PGbool))

1503+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1504+jsonbInsert tgt path val insertAfter = case insertAfter of

1505+ Just i -> unsafeVariadicFunction "jsonb_insert" (tgt :* path :* val :* i :* Nil)

1506+ Nothing -> unsafeVariadicFunction "jsonb_insert" (tgt :* path :* val :* Nil)

1507+

1508+-- | Returns its argument as indented JSON text.

1509+jsonbPretty :: nullity 'PGjsonb :--> nullity 'PGtext

1510+jsonbPretty = unsafeFunction "jsonb_pretty"

1511+

1512+(@@) :: Operator (nullity 'PGtsvector) (nullity 'PGtsquery) ('Null 'PGbool)

1513+(@@) = unsafeBinaryOp "@@"

1514+

1515+(.&) :: Operator (nullity 'PGtsquery) (nullity 'PGtsquery) (nullity 'PGtsquery)

1516+(.&) = unsafeBinaryOp "&&"

1517+

1518+(.|) :: Operator (nullity 'PGtsquery) (nullity 'PGtsquery) (nullity 'PGtsquery)

1519+(.|) = unsafeBinaryOp "||"

1520+

1521+(.!) :: nullity 'PGtsquery :--> nullity 'PGtsquery

1522+(.!) = unsafeUnaryOp "!!"

1523+

1524+(<->) :: Operator (nullity 'PGtsquery) (nullity 'PGtsquery) (nullity 'PGtsquery)

1525+(<->) = unsafeBinaryOp "<->"

1526+

1527+arrayToTSvector

1528+ :: nullity ('PGvararray ('NotNull 'PGtext))

1529+ :--> nullity 'PGtsvector

1530+arrayToTSvector = unsafeFunction "array_to_tsvector"

1531+

1532+tsvectorLength :: nullity 'PGtsvector :--> nullity 'PGint4

1533+tsvectorLength = unsafeFunction "length"

1534+

1535+numnode :: nullity 'PGtsquery :--> nullity 'PGint4

1536+numnode = unsafeFunction "numnode"

1537+

1538+plainToTSquery

1539+ :: FunctionHet '[nullity 'PGtext, nullity 'PGtext] (nullity 'PGtsquery)

1540+plainToTSquery = unsafeFunctionHet "plainto_tsquery"

1541+

1542+phraseToTSquery

1543+ :: FunctionHet '[nullity 'PGtext, nullity 'PGtext] (nullity 'PGtsquery)

1544+phraseToTSquery = unsafeFunctionHet "phraseto_tsquery"

1545+

1546+websearchToTSquery

1547+ :: FunctionHet '[nullity 'PGtext, nullity 'PGtext] (nullity 'PGtsquery)

1548+websearchToTSquery = unsafeFunctionHet "websearch_to_tsquery"

1549+

1550+queryTree :: nullity 'PGtsquery :--> nullity 'PGtext

1551+queryTree = unsafeFunction "query_tree"

1552+

1553+toTSquery

1554+ :: FunctionHet '[nullity 'PGtext, nullity 'PGtext] (nullity 'PGtsquery)

1555+toTSquery = unsafeFunctionHet "to_tsquery"

1556+

1557+toTSvector

1558+ :: ty `In` '[ 'PGtext, 'PGjson, 'PGjsonb]

1559+ => FunctionHet '[nullity 'PGtext, nullity ty] (nullity 'PGtsquery)

1560+toTSvector = unsafeFunctionHet "to_tsvector"

1561+

1562+{-----------------------------------------

1563+aggregation

1564+-----------------------------------------}

1565+

1566+{- |

1567+`Aggregate` functions compute a single result from a set of input values.

1568+`Aggregate` functions can be used as `GroupedBy` `Expression`s as well

1569+as `WindowFunction`s.

1570+-}

1571+class Aggregate expr1 expr2 aggr

1572+ | aggr -> expr1, aggr -> expr2 where

1573+

1574+ -- | A special aggregation that does not require an input

1575+ --

1576+ -- >>> :{

1577+ -- let

1578+ -- expression :: Expression '[] ('Grouped bys) commons schemas params from ('NotNull 'PGint8)

1579+ -- expression = countStar

1580+ -- in printSQL expression

1581+ -- :}

1582+ -- count(*)

1583+ countStar :: aggr ('NotNull 'PGint8)

1584+

1585+ -- | >>> :{

1586+ -- let

1587+ -- expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: nullity ty]] ('NotNull 'PGint8)

1588+ -- expression = count (All #col)

1589+ -- in printSQL expression

1590+ -- :}

1591+ -- count(ALL "col")

1592+ count

1593+ :: expr1 ty

1594+ -- ^ what to count

1595+ -> aggr ('NotNull 'PGint8)

1596+

1597+ -- | >>> :{

1598+ -- let

1599+ -- expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: 'Null 'PGnumeric]] ('NotNull 'PGnumeric)

1600+ -- expression = sum_ (Distinct #col)

1601+ -- in printSQL expression

1602+ -- :}

1603+ -- sum(DISTINCT "col")

1604+ sum_

1605+ :: ty `In` PGNum

1606+ => expr1 (nullity ty)

1607+ -> aggr ('NotNull ty)

1608+

1609+ -- | input values, including nulls, concatenated into an array

1610+ arrayAgg

1611+ :: expr1 ty

1612+ -> aggr ('Null ('PGvararray ty))

1613+

1614+ -- | aggregates values as a JSON array

1615+ jsonAgg

1616+ :: expr1 ty

1617+ -> aggr ('Null 'PGjson)

1618+

1619+ -- | aggregates values as a JSON array

1620+ jsonbAgg

1621+ :: expr1 ty

1622+ -> aggr ('Null 'PGjsonb)

1623+

1624+ {- |

1625+ the bitwise AND of all non-null input values, or null if none

1626+ >>> :{

1627+ let

1628+ expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: nullity 'PGint4]] ('Null 'PGint4)

1629+ expression = bitAnd (Distinct #col)

1630+ in printSQL expression

1631+ :}

1632+ bit_and(DISTINCT "col")

1633+ -}

1634+ bitAnd

1635+ :: int `In` PGIntegral

1636+ => expr1 (nullity int)

1637+ -- ^ what to aggregate

1638+ -> aggr ('Null int)

1639+

1640+ {- |

1641+ the bitwise OR of all non-null input values, or null if none

1642+

1643+ >>> :{

1644+ let

1645+ expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: nullity 'PGint4]] ('Null 'PGint4)

1646+ expression = bitOr (All #col)

1647+ in printSQL expression

1648+ :}

1649+ bit_or(ALL "col")

1650+ -}

1651+ bitOr

1652+ :: int `In` PGIntegral

1653+ => expr1 (nullity int)

1654+ -- ^ what to aggregate

1655+ -> aggr ('Null int)

1656+

1657+ {- |

1658+ true if all input values are true, otherwise false

1659+

1660+ >>> :{

1661+ let

1662+ winFun :: WindowFunction '[] 'Ungrouped commons schemas params '[tab ::: '["col" ::: nullity 'PGbool]] ('Null 'PGbool)

1663+ winFun = boolAnd #col

1664+ in printSQL winFun

1665+ :}

1666+ bool_and("col")

1667+ -}

1668+ boolAnd

1669+ :: expr1 (nullity 'PGbool)

1670+ -- ^ what to aggregate

1671+ -> aggr ('Null 'PGbool)

1672+

1673+ {- |

1674+ true if at least one input value is true, otherwise false

1675+

1676+ >>> :{

1677+ let

1678+ expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: nullity 'PGbool]] ('Null 'PGbool)

1679+ expression = boolOr (All #col)

1680+ in printSQL expression

1681+ :}

1682+ bool_or(ALL "col")

1683+ -}

1684+ boolOr

1685+ :: expr1(nullity 'PGbool)

1686+ -- ^ what to aggregate

1687+ -> aggr ('Null 'PGbool)

1688+

1689+ {- |

1690+ equivalent to `boolAnd`

1691+

1692+ >>> :{

1693+ let

1694+ expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: nullity 'PGbool]] ('Null 'PGbool)

1695+ expression = every (Distinct #col)

1696+ in printSQL expression

1697+ :}

1698+ every(DISTINCT "col")

1699+ -}

1700+ every

1701+ :: expr1 (nullity 'PGbool)

1702+ -- ^ what to aggregate

1703+ -> aggr ('Null 'PGbool)

1704+

1705+ {- |maximum value of expression across all input values-}

1706+ max_

1707+ :: expr1 (nullity ty)

1708+ -- ^ what to maximize

1709+ -> aggr ('Null ty)

1710+

1711+ -- | minimum value of expression across all input values

1712+ min_

1713+ :: expr1 (nullity ty)

1714+ -- ^ what to minimize

1715+ -> aggr ('Null ty)

1716+

1717+ -- | the average (arithmetic mean) of all input values

1718+ avg

1719+ :: expr1 (nullity ty)

1720+ -- ^ what to average

1721+ -> aggr ('Null (PGAvg ty))

1722+

1723+ {- | correlation coefficient

1724+ >>> :{

1725+ let

1726+ expression :: Expression '[] ('Grouped g) c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1727+ expression = corr (All (#y :*: #x))

1728+ in printSQL expression

1729+ :}

1730+ corr(ALL "y", "x")

1731+ -}

1732+ corr

1733+ :: expr2 (nullity 'PGfloat8)

1734+ -> aggr ('Null 'PGfloat8)

1735+

1736+ {- | population covariance

1737+ >>> :{

1738+ let

1739+ expression :: Expression '[] ('Grouped g) c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1740+ expression = covarPop (All (#y :*: #x))

1741+ in printSQL expression

1742+ :}

1743+ covar_pop(ALL "y", "x")

1744+ -}

1745+ covarPop

1746+ :: expr2 (nullity 'PGfloat8)

1747+ -> aggr ('Null 'PGfloat8)

1748+

1749+ {- | sample covariance

1750+ >>> :{

1751+ let

1752+ winFun :: WindowFunction '[] 'Ungrouped c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1753+ winFun = covarSamp (#y :*: #x)

1754+ in printSQL winFun

1755+ :}

1756+ covar_samp("y", "x")

1757+ -}

1758+ covarSamp

1759+ :: expr2 (nullity 'PGfloat8)

1760+ -> aggr ('Null 'PGfloat8)

1761+

1762+ {- | average of the independent variable (sum(X)/N)

1763+ >>> :{

1764+ let

1765+ expression :: Expression '[] ('Grouped g) c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1766+ expression = regrAvgX (All (#y :*: #x))

1767+ in printSQL expression

1768+ :}

1769+ regr_avgx(ALL "y", "x")

1770+ -}

1771+ regrAvgX

1772+ :: expr2 (nullity 'PGfloat8)

1773+ -> aggr ('Null 'PGfloat8)

1774+

1775+ {- | average of the dependent variable (sum(Y)/N)

1776+ >>> :{

1777+ let

1778+ winFun :: WindowFunction '[] 'Ungrouped c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1779+ winFun = regrAvgY (#y :*: #x)

1780+ in printSQL winFun

1781+ :}

1782+ regr_avgy("y", "x")

1783+ -}

1784+ regrAvgY

1785+ :: expr2 (nullity 'PGfloat8)

1786+ -> aggr ('Null 'PGfloat8)

1787+

1788+ {- | number of input rows in which both expressions are nonnull

1789+ >>> :{

1790+ let

1791+ winFun :: WindowFunction '[] 'Ungrouped c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGint8)

1792+ winFun = regrCount (#y :*: #x)

1793+ in printSQL winFun

1794+ :}

1795+ regr_count("y", "x")

1796+ -}

1797+ regrCount

1798+ :: expr2 (nullity 'PGfloat8)

1799+ -> aggr ('Null 'PGint8)

1800+

1801+ {- | y-intercept of the least-squares-fit linear equation determined by the (X, Y) pairs

1802+ >>> :{

1803+ let

1804+ expression :: Expression '[] ('Grouped g) c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1805+ expression = regrIntercept (All (#y :*: #x))

1806+ in printSQL expression

1807+ :}

1808+ regr_intercept(ALL "y", "x")

1809+ -}

1810+ regrIntercept

1811+ :: expr2 (nullity 'PGfloat8)

1812+ -> aggr ('Null 'PGfloat8)

1813+

1814+ -- | @regr_r2(Y, X)@, square of the correlation coefficient

1815+ regrR2

1816+ :: expr2 (nullity 'PGfloat8)

1817+ -> aggr ('Null 'PGfloat8)

1818+

1819+ -- | @regr_slope(Y, X)@, slope of the least-squares-fit linear equation

1820+ -- determined by the (X, Y) pairs

1821+ regrSlope

1822+ :: expr2 (nullity 'PGfloat8)

1823+ -> aggr ('Null 'PGfloat8)

1824+

1825+ -- | @regr_sxx(Y, X)@, sum(X^2) - sum(X)^2/N

1826+ -- (“sum of squares” of the independent variable)

1827+ regrSxx

1828+ :: expr2 (nullity 'PGfloat8)

1829+ -> aggr ('Null 'PGfloat8)

1830+

1831+ -- | @regr_sxy(Y, X)@, sum(X*Y) - sum(X) * sum(Y)/N

1832+ -- (“sum of products” of independent times dependent variable)

1833+ regrSxy

1834+ :: expr2 (nullity 'PGfloat8)

1835+ -> aggr ('Null 'PGfloat8)

1836+

1837+ -- | @regr_syy(Y, X)@, sum(Y^2) - sum(Y)^2/N

1838+ -- (“sum of squares” of the dependent variable)

1839+ regrSyy

1840+ :: expr2 (nullity 'PGfloat8)

1841+ -> aggr ('Null 'PGfloat8)

1842+

1843+ -- | historical alias for `stddevSamp`

1844+ stddev

1845+ :: expr1 (nullity ty)

1846+ -> aggr ('Null (PGAvg ty))

1847+

1848+ -- | population standard deviation of the input values

1849+ stddevPop

1850+ :: expr1 (nullity ty)

1851+ -> aggr ('Null (PGAvg ty))

1852+

1853+ -- | sample standard deviation of the input values

1854+ stddevSamp

1855+ :: expr1 (nullity ty)

1856+ -> aggr ('Null (PGAvg ty))

1857+

1858+ -- | historical alias for `varSamp`

1859+ variance

1860+ :: expr1 (nullity ty)

1861+ -> aggr ('Null (PGAvg ty))

1862+

1863+ -- | population variance of the input values

1864+ -- (square of the population standard deviation)

1865+ varPop

1866+ :: expr1 (nullity ty)

1867+ -> aggr ('Null (PGAvg ty))

1868+

1869+ -- | sample variance of the input values

1870+ -- (square of the sample standard deviation)

1871+ varSamp

1872+ :: expr1 (nullity ty)

1873+ -> aggr ('Null (PGAvg ty))

1874+

1875+{- |

1876+`Distinction`s are used for the input of `Aggregate` `Expression`s.

1877+`All` invokes the aggregate once for each input row.

1878+`Distinct` invokes the aggregate once for each distinct value of the expression

1879+(or distinct set of values, for multiple expressions) found in the input

1880+-}

1881+data Distinction expr ty

1882+ = All (expr ty)

1883+ | Distinct (expr ty)

1884+ deriving (GHC.Generic,Show,Eq,Ord)

1885+instance NFData (Distinction (Expression outer grp commons schemas params from) ty)

1886+instance RenderSQL (Distinction (Expression outer grp commons schemas params from) ty) where

1887+ renderSQL = \case

1888+ All x -> "ALL" <+> renderSQL x

1889+ Distinct x -> "DISTINCT" <+> renderSQL x

1890+instance RenderSQL

1891+ (Distinction

1892+ ( Expression outer grp commons schemas params from

1893+ :*:

1894+ Expression outer grp commons schemas params from) xty ) where

1895+ renderSQL = \case

1896+ All (x :*: x') ->

1897+ "ALL" <+> renderSQL x <> ", " <> renderSQL x'

1898+ Distinct (x :*: x') ->

1899+ "DISTINCT" <+> renderSQL x <> ", " <> renderSQL x'

1900+

1901+instance Aggregate

1902+ (Distinction (Expression outer 'Ungrouped commons schemas params from))

1903+ (Distinction (Expression outer 'Ungrouped commons schemas params from :*: Expression outer 'Ungrouped commons schemas params from))

1904+ (Expression outer ('Grouped bys) commons schemas params from) where

1905+ countStar = UnsafeExpression "count(*)"

1906+ count = unsafeAggregate1 "count"

1907+ sum_ = unsafeAggregate1 "sum"

1908+ arrayAgg = unsafeAggregate1 "array_agg"

1909+ jsonAgg = unsafeAggregate1 "json_agg"

1910+ jsonbAgg = unsafeAggregate1 "jsonb_agg"

1911+ bitAnd = unsafeAggregate1 "bit_and"

1912+ bitOr = unsafeAggregate1 "bit_or"

1913+ boolAnd = unsafeAggregate1 "bool_and"

1914+ boolOr = unsafeAggregate1 "bool_or"

1915+ every = unsafeAggregate1 "every"

1916+ max_ = unsafeAggregate1 "max"

1917+ min_ = unsafeAggregate1 "min"

1918+ avg = unsafeAggregate1 "avg"

1919+ corr = unsafeAggregate2 "corr"

1920+ covarPop = unsafeAggregate2 "covar_pop"

1921+ covarSamp = unsafeAggregate2 "covar_samp"

1922+ regrAvgX = unsafeAggregate2 "regr_avgx"

1923+ regrAvgY = unsafeAggregate2 "regr_avgy"

1924+ regrCount = unsafeAggregate2 "regr_count"

1925+ regrIntercept = unsafeAggregate2 "regr_intercept"

1926+ regrR2 = unsafeAggregate2 "regr_r2"

1927+ regrSlope = unsafeAggregate2 "regr_slope"

1928+ regrSxx = unsafeAggregate2 "regr_sxx"

1929+ regrSxy = unsafeAggregate2 "regr_sxy"

1930+ regrSyy = unsafeAggregate2 "regr_syy"

1931+ stddev = unsafeAggregate1 "stddev"

1932+ stddevPop = unsafeAggregate1 "stddev_pop"

1933+ stddevSamp = unsafeAggregate1 "stddev_samp"

1934+ variance = unsafeAggregate1 "variance"

1935+ varPop = unsafeAggregate1 "var_pop"

1936+ varSamp = unsafeAggregate1 "var_samp"

1937+instance Aggregate

1938+ (Expression outer grp commons schemas params from)

1939+ (Expression outer grp commons schemas params from :*: Expression outer grp commons schemas params from)

1940+ (WindowFunction outer grp commons schemas params from) where

1941+ countStar = UnsafeWindowFunction "count(*)"

1942+ count = unsafeWindowFunction1 "count"

1943+ sum_ = unsafeWindowFunction1 "sum"

1944+ arrayAgg = unsafeWindowFunction1 "array_agg"

1945+ jsonAgg = unsafeWindowFunction1 "json_agg"

1946+ jsonbAgg = unsafeWindowFunction1 "jsonb_agg"

1947+ bitAnd = unsafeWindowFunction1 "bit_and"

1948+ bitOr = unsafeWindowFunction1 "bit_or"

1949+ boolAnd = unsafeWindowFunction1 "bool_and"

1950+ boolOr = unsafeWindowFunction1 "bool_or"

1951+ every = unsafeWindowFunction1 "every"

1952+ max_ = unsafeWindowFunction1 "max"

1953+ min_ = unsafeWindowFunction1 "min"

1954+ avg = unsafeWindowFunction1 "avg"

1955+ corr = unsafeWindowFunction2 "corr"

1956+ covarPop = unsafeWindowFunction2 "covar_pop"

1957+ covarSamp = unsafeWindowFunction2 "covar_samp"

1958+ regrAvgX = unsafeWindowFunction2 "regr_avgx"

1959+ regrAvgY = unsafeWindowFunction2 "regr_avgy"

1960+ regrCount = unsafeWindowFunction2 "regr_count"

1961+ regrIntercept = unsafeWindowFunction2 "regr_intercept"

1962+ regrR2 = unsafeWindowFunction2 "regr_r2"

1963+ regrSlope = unsafeWindowFunction2 "regr_slope"

1964+ regrSxx = unsafeWindowFunction2 "regr_sxx"

1965+ regrSxy = unsafeWindowFunction2 "regr_sxy"

1966+ regrSyy = unsafeWindowFunction2 "regr_syy"

1967+ stddev = unsafeWindowFunction1 "stddev"

1968+ stddevPop = unsafeWindowFunction1 "stddev_pop"

1969+ stddevSamp = unsafeWindowFunction1 "stddev_samp"

1970+ variance = unsafeWindowFunction1 "variance"

1971+ varPop = unsafeWindowFunction1 "var_pop"

1972+ varSamp = unsafeWindowFunction1 "var_samp"

1973+

1974+-- | escape hatch to define aggregate functions

1975+unsafeAggregate1

1976+ :: ByteString -- ^ aggregate function

1977+ -> Distinction (Expression outer 'Ungrouped commons schemas params from) xty

1978+ -> Expression outer ('Grouped bys) commons schemas params from yty

1979+unsafeAggregate1 fun x = UnsafeExpression $ mconcat

1980+ [fun, "(", renderSQL x, ")"]

1981+

1982+-- | escape hatch to define aggregate binary functions

1983+unsafeAggregate2

1984+ :: ByteString -- ^ aggregate function

1985+ -> Distinction (Expression outer 'Ungrouped commons schemas params from :*: Expression outer 'Ungrouped commons schemas params from) xty

1986+ -> Expression outer ('Grouped bys) commons schemas params from yty

1987+unsafeAggregate2 fun xx = UnsafeExpression $ mconcat

1988+ [fun, "(", renderSQL xx, ")"]

1989+

1990+-- | A type family that calculates `PGAvg` type of a `PGType`.

1991+type family PGAvg ty where

1992+ PGAvg 'PGint2 = 'PGnumeric

1993+ PGAvg 'PGint4 = 'PGnumeric

1994+ PGAvg 'PGint8 = 'PGnumeric

1995+ PGAvg 'PGnumeric = 'PGnumeric

1996+ PGAvg 'PGfloat4 = 'PGfloat8

1997+ PGAvg 'PGfloat8 = 'PGfloat8

1998+ PGAvg 'PGinterval = 'PGinterval

1999+ PGAvg pg = TypeError

2000+ ('Text "Squeal type error: No average for " ':<>: 'ShowType pg)

2001+

2002+{-----------------------------------------

2003+type expressions

2004+-----------------------------------------}

2005+

2006+-- | `TypeExpression`s are used in `cast`s and

2007+-- `Squeal.PostgreSQL.Definition.createTable` commands.

2008+newtype TypeExpression (schemas :: SchemasType) (ty :: NullityType)

2009+ = UnsafeTypeExpression { renderTypeExpression :: ByteString }

2010+ deriving (GHC.Generic,Show,Eq,Ord,NFData)

2011+instance RenderSQL (TypeExpression schemas ty) where

2012+ renderSQL = renderTypeExpression

2013+

2014+-- | The enum or composite type in a `Typedef` can be expressed by its alias.

2015+typedef

2016+ :: (Has sch schemas schema, Has td schema ('Typedef ty))

2017+ => QualifiedAlias sch td

2018+ -> TypeExpression schemas (nullity ty)

2019+typedef = UnsafeTypeExpression . renderSQL

2020+

2021+-- | The composite type corresponding to a `Table` definition can be expressed

2022+-- by its alias.

2023+typetable

2024+ :: (Has sch schemas schema, Has tab schema ('Table table))

2025+ => QualifiedAlias sch tab

2026+ -> TypeExpression schemas (nullity ('PGcomposite (TableToRow table)))

2027+typetable = UnsafeTypeExpression . renderSQL

2028+

2029+-- | The composite type corresponding to a `View` definition can be expressed

2030+-- by its alias.

2031+typeview

2032+ :: (Has sch schemas schema, Has vw schema ('View view))

2033+ => QualifiedAlias sch vw

2034+ -> TypeExpression schemas (nullity ('PGcomposite view))

2035+typeview = UnsafeTypeExpression . renderSQL

2036+

2037+-- | logical Boolean (true/false)

2038+bool :: TypeExpression schemas (nullity 'PGbool)

2039+bool = UnsafeTypeExpression "bool"

2040+-- | signed two-byte integer

2041+int2, smallint :: TypeExpression schemas (nullity 'PGint2)

2042+int2 = UnsafeTypeExpression "int2"

2043+smallint = UnsafeTypeExpression "smallint"

2044+-- | signed four-byte integer

2045+int4, int, integer :: TypeExpression schemas (nullity 'PGint4)

2046+int4 = UnsafeTypeExpression "int4"

2047+int = UnsafeTypeExpression "int"

2048+integer = UnsafeTypeExpression "integer"

2049+-- | signed eight-byte integer

2050+int8, bigint :: TypeExpression schemas (nullity 'PGint8)

2051+int8 = UnsafeTypeExpression "int8"

2052+bigint = UnsafeTypeExpression "bigint"

2053+-- | arbitrary precision numeric type

2054+numeric :: TypeExpression schemas (nullity 'PGnumeric)

2055+numeric = UnsafeTypeExpression "numeric"

2056+-- | single precision floating-point number (4 bytes)

2057+float4, real :: TypeExpression schemas (nullity 'PGfloat4)

2058+float4 = UnsafeTypeExpression "float4"

2059+real = UnsafeTypeExpression "real"

2060+-- | double precision floating-point number (8 bytes)

2061+float8, doublePrecision :: TypeExpression schemas (nullity 'PGfloat8)

2062+float8 = UnsafeTypeExpression "float8"

2063+doublePrecision = UnsafeTypeExpression "double precision"

2064+-- | currency amount

2065+money :: TypeExpression schema (nullity 'PGmoney)

2066+money = UnsafeTypeExpression "money"

2067+-- | variable-length character string

2068+text :: TypeExpression schemas (nullity 'PGtext)

2069+text = UnsafeTypeExpression "text"

2070+-- | fixed-length character string

2071+char, character

2072+ :: forall n schemas nullity. (KnownNat n, 1 <= n)

2073+ => TypeExpression schemas (nullity ('PGchar n))

2074+char = UnsafeTypeExpression $ "char(" <> renderNat @n <> ")"

2075+character = UnsafeTypeExpression $ "character(" <> renderNat @n <> ")"

2076+-- | variable-length character string

2077+varchar, characterVarying

2078+ :: forall n schemas nullity. (KnownNat n, 1 <= n)

2079+ => TypeExpression schemas (nullity ('PGvarchar n))

2080+varchar = UnsafeTypeExpression $ "varchar(" <> renderNat @n <> ")"

2081+characterVarying = UnsafeTypeExpression $

2082+ "character varying(" <> renderNat @n <> ")"

2083+-- | binary data ("byte array")

2084+bytea :: TypeExpression schemas (nullity 'PGbytea)

2085+bytea = UnsafeTypeExpression "bytea"

2086+-- | date and time (no time zone)

2087+timestamp :: TypeExpression schemas (nullity 'PGtimestamp)

2088+timestamp = UnsafeTypeExpression "timestamp"

2089+-- | date and time, including time zone

2090+timestampWithTimeZone :: TypeExpression schemas (nullity 'PGtimestamptz)

2091+timestampWithTimeZone = UnsafeTypeExpression "timestamp with time zone"

2092+-- | calendar date (year, month, day)

2093+date :: TypeExpression schemas (nullity 'PGdate)

2094+date = UnsafeTypeExpression "date"

2095+-- | time of day (no time zone)

2096+time :: TypeExpression schemas (nullity 'PGtime)

2097+time = UnsafeTypeExpression "time"

2098+-- | time of day, including time zone

2099+timeWithTimeZone :: TypeExpression schemas (nullity 'PGtimetz)

2100+timeWithTimeZone = UnsafeTypeExpression "time with time zone"

2101+-- | time span

2102+interval :: TypeExpression schemas (nullity 'PGinterval)

2103+interval = UnsafeTypeExpression "interval"

2104+-- | universally unique identifier

2105+uuid :: TypeExpression schemas (nullity 'PGuuid)

2106+uuid = UnsafeTypeExpression "uuid"

2107+-- | IPv4 or IPv6 host address

2108+inet :: TypeExpression schemas (nullity 'PGinet)

2109+inet = UnsafeTypeExpression "inet"

2110+-- | textual JSON data

2111+json :: TypeExpression schemas (nullity 'PGjson)

2112+json = UnsafeTypeExpression "json"

2113+-- | binary JSON data, decomposed

2114+jsonb :: TypeExpression schemas (nullity 'PGjsonb)

2115+jsonb = UnsafeTypeExpression "jsonb"

2116+-- | variable length array

2117+vararray

2118+ :: TypeExpression schemas pg

2119+ -> TypeExpression schemas (nullity ('PGvararray pg))

2120+vararray ty = UnsafeTypeExpression $ renderSQL ty <> "[]"

2121+-- | fixed length array

2122+--

2123+-- >>> renderSQL (fixarray @'[2] json)

2124+-- "json[2]"

2125+fixarray

2126+ :: forall dims schemas nullity pg. SOP.All KnownNat dims

2127+ => TypeExpression schemas pg

2128+ -> TypeExpression schemas (nullity ('PGfixarray dims pg))

2129+fixarray ty = UnsafeTypeExpression $

2130+ renderSQL ty <> renderDims @dims

2131+ where

2132+ renderDims :: forall ns. SOP.All KnownNat ns => ByteString

2133+ renderDims =

2134+ ("[" <>)

2135+ . (<> "]")

2136+ . ByteString.intercalate "]["

2137+ . hcollapse

2138+ $ hcmap (SOP.Proxy @KnownNat)

2139+ (K . fromString . show . natVal)

2140+ (hpure SOP.Proxy :: NP SOP.Proxy ns)

2141+tsvector :: TypeExpression schemas (nullity 'PGtsvector)

2142+tsvector = UnsafeTypeExpression "tsvector"

2143+tsquery :: TypeExpression schemas (nullity 'PGtsquery)

2144+tsquery = UnsafeTypeExpression "tsquery"

2145+

2146+-- | `pgtype` is a demoted version of a `PGType`

2147+class PGTyped schemas (ty :: NullityType) where

2148+ pgtype :: TypeExpression schemas ty

2149+instance PGTyped schemas (nullity 'PGbool) where pgtype = bool

2150+instance PGTyped schemas (nullity 'PGint2) where pgtype = int2

2151+instance PGTyped schemas (nullity 'PGint4) where pgtype = int4

2152+instance PGTyped schemas (nullity 'PGint8) where pgtype = int8

2153+instance PGTyped schemas (nullity 'PGnumeric) where pgtype = numeric

2154+instance PGTyped schemas (nullity 'PGfloat4) where pgtype = float4

2155+instance PGTyped schemas (nullity 'PGfloat8) where pgtype = float8

2156+instance PGTyped schemas (nullity 'PGmoney) where pgtype = money

2157+instance PGTyped schemas (nullity 'PGtext) where pgtype = text

2158+instance (KnownNat n, 1 <= n)

2159+ => PGTyped schemas (nullity ('PGchar n)) where pgtype = char @n

2160+instance (KnownNat n, 1 <= n)

2161+ => PGTyped schemas (nullity ('PGvarchar n)) where pgtype = varchar @n

2162+instance PGTyped schemas (nullity 'PGbytea) where pgtype = bytea

2163+instance PGTyped schemas (nullity 'PGtimestamp) where pgtype = timestamp

2164+instance PGTyped schemas (nullity 'PGtimestamptz) where pgtype = timestampWithTimeZone

2165+instance PGTyped schemas (nullity 'PGdate) where pgtype = date

2166+instance PGTyped schemas (nullity 'PGtime) where pgtype = time

2167+instance PGTyped schemas (nullity 'PGtimetz) where pgtype = timeWithTimeZone

2168+instance PGTyped schemas (nullity 'PGinterval) where pgtype = interval

2169+instance PGTyped schemas (nullity 'PGuuid) where pgtype = uuid

2170+instance PGTyped schemas (nullity 'PGjson) where pgtype = json

2171+instance PGTyped schemas (nullity 'PGjsonb) where pgtype = jsonb

2172+instance PGTyped schemas ty

2173+ => PGTyped schemas (nullity ('PGvararray ty)) where

2174+ pgtype = vararray (pgtype @schemas @ty)

2175+instance (SOP.All KnownNat dims, PGTyped schemas ty)

2176+ => PGTyped schemas (nullity ('PGfixarray dims ty)) where

2177+ pgtype = fixarray @dims (pgtype @schemas @ty)

2178+instance PGTyped schemas (nullity 'PGtsvector) where pgtype = tsvector

2179+instance PGTyped schemas (nullity 'PGtsquery) where pgtype = tsquery

2180+

2181+{-----------------------------------------

2182+Sorting

2183+-----------------------------------------}

2184+

2185+-- | `SortExpression`s are used by `orderBy` to optionally sort the results

2186+-- of a `Squeal.PostgreSQL.Query.Query`. `Asc` or `Desc`

2187+-- set the sort direction of a `NotNull` result

2188+-- column to ascending or descending. Ascending order puts smaller values

2189+-- first, where "smaller" is defined in terms of the `.<` operator. Similarly,

2190+-- descending order is determined with the `.>` operator. `AscNullsFirst`,

2191+-- `AscNullsLast`, `DescNullsFirst` and `DescNullsLast` options are used to

2192+-- determine whether nulls appear before or after non-null values in the sort

2193+-- ordering of a `Null` result column.

2194+data SortExpression outer grp commons schemas params from where

2195+ Asc

2196+ :: Expression outer grp commons schemas params from ('NotNull ty)

2197+ -> SortExpression outer grp commons schemas params from

2198+ Desc

2199+ :: Expression outer grp commons schemas params from ('NotNull ty)

2200+ -> SortExpression outer grp commons schemas params from

2201+ AscNullsFirst

2202+ :: Expression outer grp commons schemas params from ('Null ty)

2203+ -> SortExpression outer grp commons schemas params from

2204+ AscNullsLast

2205+ :: Expression outer grp commons schemas params from ('Null ty)

2206+ -> SortExpression outer grp commons schemas params from

2207+ DescNullsFirst

2208+ :: Expression outer grp commons schemas params from ('Null ty)

2209+ -> SortExpression outer grp commons schemas params from

2210+ DescNullsLast

2211+ :: Expression outer grp commons schemas params from ('Null ty)

2212+ -> SortExpression outer grp commons schemas params from

2213+deriving instance Show (SortExpression outer grp commons schemas params from)

2214+

2215+{- |

2216+The `orderBy` clause causes the result rows of a `Squeal.PostgreSQL.Query.TableExpression`

2217+to be sorted according to the specified `SortExpression`(s).

2218+If two rows are equal according to the leftmost expression,

2219+they are compared according to the next expression and so on.

2220+If they are equal according to all specified expressions,

2221+they are returned in an implementation-dependent order.

2222+

2223+You can also control the order in which rows are processed by window functions

2224+using `orderBy` within `Squeal.PostgreSQL.Query.Over`.

2225+-}

2226+class OrderBy expr where

2227+ orderBy

2228+ :: [SortExpression outer grp commons schemas params from]

2229+ -> expr outer grp commons schemas params from

2230+ -> expr outer grp commons schemas params from

2231+

2232+-- | Render a `SortExpression`.

2233+instance RenderSQL (SortExpression outer grp commons schemas params from) where

2234+ renderSQL = \case

2235+ Asc expression -> renderSQL expression <+> "ASC"

2236+ Desc expression -> renderSQL expression <+> "DESC"

2237+ AscNullsFirst expression -> renderSQL expression

2238+ <+> "ASC NULLS FIRST"

2239+ DescNullsFirst expression -> renderSQL expression

2240+ <+> "DESC NULLS FIRST"

2241+ AscNullsLast expression -> renderSQL expression <+> "ASC NULLS LAST"

2242+ DescNullsLast expression -> renderSQL expression <+> "DESC NULLS LAST"

2243+

2244+-- | A `WindowDefinition` is a set of table rows that are somehow related

2245+-- to the current row

2246+data WindowDefinition outer grp commons schemas params from where

2247+ WindowDefinition

2248+ :: SListI bys

2249+ => NP (Expression outer grp commons schemas params from) bys

2250+ -> [SortExpression outer grp commons schemas params from]

2251+ -> WindowDefinition outer grp commons schemas params from

2252+

2253+instance OrderBy WindowDefinition where

2254+ orderBy sortsR (WindowDefinition parts sortsL)

2255+ = WindowDefinition parts (sortsL ++ sortsR)

2256+

2257+instance RenderSQL (WindowDefinition outer commons schemas from grp params) where

2258+ renderSQL (WindowDefinition part ord) =

2259+ renderPartitionByClause part <> renderOrderByClause ord

2260+ where

2261+ renderPartitionByClause = \case

2262+ Nil -> ""

2263+ parts -> "PARTITION" <+> "BY" <+> renderCommaSeparated renderExpression parts

2264+ renderOrderByClause = \case

2265+ [] -> ""

2266+ srts -> " ORDER" <+> "BY"

2267+ <+> commaSeparated (renderSQL <$> srts)

2268+

2269+{- |

2270+The `partitionBy` clause within `Squeal.PostgreSQL.Query.Over` divides the rows into groups,

2271+or partitions, that share the same values of the `partitionBy` `Expression`(s).

2272+For each row, the window function is computed across the rows that fall into

2273+the same partition as the current row.

2274+-}

2275+partitionBy

2276+ :: SListI bys

2277+ => NP (Expression outer grp commons schemas params from) bys

2278+ -> WindowDefinition outer grp commons schemas params from

2279+partitionBy bys = WindowDefinition bys []

2280+

2281+{- |

2282+A window function performs a calculation across a set of table rows

2283+that are somehow related to the current row. This is comparable to the type

2284+of calculation that can be done with an aggregate function.

2285+However, window functions do not cause rows to become grouped into a single

2286+output row like non-window aggregate calls would.

2287+Instead, the rows retain their separate identities.

2288+Behind the scenes, the window function is able to access more than

2289+just the current row of the query result.

2290+-}

2291+newtype WindowFunction

2292+ (outer :: FromType)

2293+ (grp :: Grouping)

2294+ (commons :: FromType)

2295+ (schemas :: SchemasType)

2296+ (params :: [NullityType])

2297+ (from :: FromType)

2298+ (ty :: NullityType)

2299+ = UnsafeWindowFunction { renderWindowFunction :: ByteString }

2300+ deriving (GHC.Generic,Show,Eq,Ord,NFData)

2301+

2302+instance RenderSQL (WindowFunction outer grp commons schemas params from ty) where

2303+ renderSQL = renderWindowFunction

2304+

2305+unsafeWindowFunction1

2306+ :: ByteString

2307+ -> Expression outer grp commons schemas params from ty0

2308+ -> WindowFunction outer grp commons schemas params from ty1

2309+unsafeWindowFunction1 fun x

2310+ = UnsafeWindowFunction $ fun <> parenthesized (renderSQL x)

2311+

2312+unsafeWindowFunction2

2313+ :: ByteString

2314+ -> (Expression outer grp commons schemas params from :*: Expression outer grp commons schemas params from) ty0

2315+ -> WindowFunction outer grp commons schemas params from ty1

2316+unsafeWindowFunction2 fun (x :*: x')

2317+ = UnsafeWindowFunction $ fun <> parenthesized (renderSQL x <> ", " <> renderSQL x')

2318+

2319+{- | rank of the current row with gaps; same as `rowNumber` of its first peer

2320+>>> printSQL rank

2321+rank()

2322+-}

2323+rank :: WindowFunction outer grp commons schemas params from ('NotNull 'PGint8)

2324+rank = UnsafeWindowFunction "rank()"

2325+

2326+{- | number of the current row within its partition, counting from 1

2327+>>> printSQL rowNumber

2328+row_number()

2329+-}

2330+rowNumber :: WindowFunction outer grp commons schemas params from ('NotNull 'PGint8)

2331+rowNumber = UnsafeWindowFunction "row_number()"

2332+

2333+{- | rank of the current row without gaps; this function counts peer groups

2334+>>> printSQL denseRank

2335+dense_rank()

2336+-}

2337+denseRank :: WindowFunction outer grp commons schemas params from ('NotNull 'PGint8)

2338+denseRank = UnsafeWindowFunction "dense_rank()"

2339+

2340+{- | relative rank of the current row: (rank - 1) / (total partition rows - 1)

2341+>>> printSQL percentRank

2342+percent_rank()

2343+-}

2344+percentRank :: WindowFunction outer grp commons schemas params from ('NotNull 'PGfloat8)

2345+percentRank = UnsafeWindowFunction "percent_rank()"

2346+

2347+{- | cumulative distribution: (number of partition rows

2348+preceding or peer with current row) / total partition rows

2349+>>> printSQL cumeDist

2350+cume_dist()

2351+-}

2352+cumeDist :: WindowFunction outer grp commons schemas params from ('NotNull 'PGfloat8)

2353+cumeDist = UnsafeWindowFunction "cume_dist()"

2354+

2355+{- | integer ranging from 1 to the argument value,

2356+dividing the partition as equally as possible

2357+-}

2358+ntile

2359+ :: Expression outer grp commons schemas params from ('NotNull 'PGint4)

2360+ -- ^ num buckets

2361+ -> WindowFunction outer grp commons schemas params from ('NotNull 'PGint4)

2362+ntile = unsafeWindowFunction1 "ntile"

2363+

2364+{- | returns value evaluated at the row that is offset rows before the current

2365+row within the partition; if there is no such row, instead return default

2366+(which must be of the same type as value). Both offset and default are

2367+evaluated with respect to the current row.

2368+-}

2369+lag

2370+ :: Expression outer grp commons schemas params from ty

2371+ -- ^ value

2372+ -> Expression outer grp commons schemas params from ('NotNull 'PGint4)

2373+ -- ^ offset

2374+ -> Expression outer grp commons schemas params from ty

2375+ -- ^ default

2376+ -> WindowFunction outer grp commons schemas params from ty

2377+lag value offset def = UnsafeWindowFunction $ "lag"

2378+ <> parenthesized

2379+ (commaSeparated ([renderSQL value, renderSQL offset, renderSQL def]))

2380+

2381+{- | returns value evaluated at the row that is offset rows after the current

2382+row within the partition; if there is no such row, instead return default

2383+(which must be of the same type as value). Both offset and default are

2384+evaluated with respect to the current row.

2385+-}

2386+lead

2387+ :: Expression outer grp commons schemas params from ty

2388+ -- ^ value

2389+ -> Expression outer grp commons schemas params from ('NotNull 'PGint4)

2390+ -- ^ offset

2391+ -> Expression outer grp commons schemas params from ty

2392+ -- ^ default

2393+ -> WindowFunction outer grp commons schemas params from ty

2394+lead value offset def = UnsafeWindowFunction $ "lag"

2395+ <> parenthesized

2396+ (commaSeparated ([renderSQL value, renderSQL offset, renderSQL def]))

2397+

2398+{- | returns value evaluated at the row that is the

2399+first row of the window frame

2400+-}

2401+firstValue

2402+ :: Expression outer grp commons schemas params from ty

2403+ -- ^ value

2404+ -> WindowFunction outer grp commons schemas params from ty

2405+firstValue = unsafeWindowFunction1 "first_value"

2406+

2407+{- | returns value evaluated at the row that is the

2408+last row of the window frame

2409+-}

2410+lastValue

2411+ :: Expression outer grp commons schemas params from ty

2412+ -- ^ value

2413+ -> WindowFunction outer grp commons schemas params from ty

2414+lastValue = unsafeWindowFunction1 "last_value"

2415+

2416+{- | returns value evaluated at the row that is the nth

2417+row of the window frame (counting from 1); null if no such row

2418+-}

2419+nthValue

2420+ :: Expression outer grp commons schemas params from (nullity ty)

2421+ -- ^ value

2422+ -> Expression outer grp commons schemas params from ('NotNull 'PGint4)

2423+ -- ^ nth

2424+ -> WindowFunction outer grp commons schemas params from ('Null ty)

2425+nthValue value nth = UnsafeWindowFunction $ "nth_value"

2426+ <> parenthesized (commaSeparated [renderSQL value, renderSQL nth])

2427+

2428+{-|

2429+Create date from year, month and day fields

2430+

2431+>>> printSQL (makeDate 1984 7 3)

2432+make_date(1984, 7, 3)

2433+-}

2434+makeDate

2435+ :: Expression outer grp commons schemas params from (nullity 'PGint4)

2436+ -- ^ year

2437+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2438+ -- ^ month

2439+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2440+ -- ^ day

2441+ -> Expression outer grp commons schemas params from (nullity 'PGdate)

2442+makeDate y m d = UnsafeExpression $ "make_date" <>

2443+ parenthesized (renderCommaSeparated renderSQL (y :* m :* d :* Nil))

2444+

2445+{-|

2446+Create time from hour, minute and seconds fields

2447+

2448+>>> printSQL (makeTime 8 15 23.5)

2449+make_time(8, 15, 23.5)

2450+-}

2451+makeTime

2452+ :: Expression outer grp commons schemas params from (nullity 'PGint4)

2453+ -- ^ hour

2454+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2455+ -- ^ min

2456+ -> Expression outer grp commons schemas params from (nullity 'PGfloat8)

2457+ -- ^ sec

2458+ -> Expression outer grp commons schemas params from (nullity 'PGtime)

2459+makeTime h m s = UnsafeExpression $ "make_time" <>

2460+ parenthesized (renderCommaSeparated renderSQL (h :* m :* s :* Nil))

2461+

2462+{-|

2463+Create timestamp from year, month, day, hour, minute and seconds fields

2464+

2465+>>> printSQL (makeTimestamp 2013 7 15 8 15 23.5)

2466+make_timestamp(2013, 7, 15, 8, 15, 23.5)

2467+-}

2468+makeTimestamp

2469+ :: Expression outer grp commons schemas params from (nullity 'PGint4)

2470+ -- ^ year

2471+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2472+ -- ^ month

2473+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2474+ -- ^ day

2475+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2476+ -- ^ hour

2477+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2478+ -- ^ min

2479+ -> Expression outer grp commons schemas params from (nullity 'PGfloat8)

2480+ -- ^ sec

2481+ -> Expression outer grp commons schemas params from (nullity 'PGtimestamp)

2482+makeTimestamp y mon d h m s =

2483+ UnsafeExpression $ "make_timestamp" <> parenthesized

2484+ (renderCommaSeparated renderSQL (y :* mon :* d :* h :* m :* s :* Nil))

2485+

2486+{-|

2487+Create timestamp with time zone from

2488+year, month, day, hour, minute and seconds fields;

2489+the current time zone is used

2490+

2491+>>> printSQL (makeTimestamptz 2013 7 15 8 15 23.5)

2492+make_timestamptz(2013, 7, 15, 8, 15, 23.5)

2493+-}

2494+makeTimestamptz

2495+ :: Expression outer grp commons schemas params from (nullity 'PGint4)

2496+ -- ^ year

2497+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2498+ -- ^ month

2499+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2500+ -- ^ day

2501+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2502+ -- ^ hour

2503+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2504+ -- ^ min

2505+ -> Expression outer grp commons schemas params from (nullity 'PGfloat8)

2506+ -- ^ sec

2507+ -> Expression outer grp commons schemas params from (nullity 'PGtimestamptz)

2508+makeTimestamptz y mon d h m s =

2509+ UnsafeExpression $ "make_timestamptz" <> parenthesized

2510+ (renderCommaSeparated renderSQL (y :* mon :* d :* h :* m :* s :* Nil))

2511+

2512+{-|

2513+Affine space operations on time types.

2514+-}

2515+class TimeOp time diff | time -> diff where

2516+ {-|

2517+ >>> printSQL (makeDate 1984 7 3 !+ 365)

2518+ (make_date(1984, 7, 3) + 365)

2519+ -}

2520+ (!+) :: Operator (nullity time) (nullity diff) (nullity time)

2521+ (!+) = unsafeBinaryOp "+"

2522+ {-|

2523+ >>> printSQL (365 +! makeDate 1984 7 3)

2524+ (365 + make_date(1984, 7, 3))

2525+ -}

2526+ (+!) :: Operator (nullity diff) (nullity time) (nullity time)

2527+ (+!) = unsafeBinaryOp "+"

2528+ {-|

2529+ >>> printSQL (makeDate 1984 7 3 !- 365)

2530+ (make_date(1984, 7, 3) - 365)

2531+ -}

2532+ (!-) :: Operator (nullity time) (nullity diff) (nullity time)

2533+ (!-) = unsafeBinaryOp "-"

2534+ {-|

2535+ >>> printSQL (makeDate 1984 7 3 !-! currentDate)

2536+ (make_date(1984, 7, 3) - CURRENT_DATE)

2537+ -}

2538+ (!-!) :: Operator (nullity time) (nullity time) (nullity diff)

2539+ (!-!) = unsafeBinaryOp "-"

2540+instance TimeOp 'PGtimestamp 'PGinterval

2541+instance TimeOp 'PGtimestamptz 'PGinterval

2542+instance TimeOp 'PGtime 'PGinterval

2543+instance TimeOp 'PGtimetz 'PGinterval

2544+instance TimeOp 'PGinterval 'PGinterval

2545+instance TimeOp 'PGdate 'PGint4

2546+infixl 6 !+

2547+infixl 6 +!

2548+infixl 6 !-

2549+infixl 6 !-!

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Aggregate.hsdeleted−462

@@ -1,462 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Aggregate

3−Description: Aggregate functions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Aggregate functions

9−-}

10−

11−{-# LANGUAGE

12− DataKinds

13− , DeriveGeneric

14− , FlexibleContexts

15− , FlexibleInstances

16− , FunctionalDependencies

17− , LambdaCase

18− , MultiParamTypeClasses

19− , OverloadedStrings

20− , PolyKinds

21− , TypeFamilies

22− , TypeOperators

23− , UndecidableInstances

24−#-}

25−

26−module Squeal.PostgreSQL.Expression.Aggregate

27− ( Aggregate (..)

28− , Distinction (..)

29− , PGSum

30− , PGAvg

31− ) where

32−

33−import Control.DeepSeq

34−import Data.ByteString (ByteString)

35−import Data.Kind

36−import GHC.TypeLits

37−

38−import qualified GHC.Generics as GHC

39−import qualified Generics.SOP as SOP

40−

41−import Squeal.PostgreSQL.Alias

42−import Squeal.PostgreSQL.Expression

43−import Squeal.PostgreSQL.List

44−import Squeal.PostgreSQL.Render

45−import Squeal.PostgreSQL.Schema

46−

47−-- $setup

48−-- >>> import Squeal.PostgreSQL

49−

50−{- |

51−`Aggregate` functions compute a single result from a set of input values.

52−`Aggregate` functions can be used as `GroupedBy` `Expression`s as well

53−as `Squeal.PostgreSQL.Expression.Window.WindowFunction`s.

54−-}

55−class Aggregate expr1 exprN aggr

56− | aggr -> expr1, aggr -> exprN where

57−

58− -- | A special aggregation that does not require an input

59− --

60− -- >>> :{

61− -- let

62− -- expression :: Expression '[] commons ('Grouped bys) schemas params from ('NotNull 'PGint8)

63− -- expression = countStar

64− -- in printSQL expression

65− -- :}

66− -- count(*)

67− countStar :: aggr ('NotNull 'PGint8)

68−

69− -- | >>> :{

70− -- let

71− -- expression :: Expression '[] commons ('Grouped bys) schemas params '[tab ::: '["col" ::: null ty]] ('NotNull 'PGint8)

72− -- expression = count (All #col)

73− -- in printSQL expression

74− -- :}

75− -- count(ALL "col")

76− count

77− :: expr1 ty

78− -- ^ what to count

79− -> aggr ('NotNull 'PGint8)

80−

81− -- | >>> :{

82− -- let

83− -- expression :: Expression '[] commons ('Grouped bys) schemas params '[tab ::: '["col" ::: 'Null 'PGnumeric]] ('Null 'PGnumeric)

84− -- expression = sum_ (Distinct #col)

85− -- in printSQL expression

86− -- :}

87− -- sum(DISTINCT "col")

88− sum_

89− :: expr1 (null ty)

90− -> aggr ('Null (PGSum ty))

91−

92− -- | input values, including nulls, concatenated into an array

93− arrayAgg

94− :: expr1 ty

95− -> aggr ('Null ('PGvararray ty))

96−

97− -- | aggregates values as a JSON array

98− jsonAgg

99− :: expr1 ty

100− -> aggr ('Null 'PGjson)

101−

102− -- | aggregates values as a JSON array

103− jsonbAgg

104− :: expr1 ty

105− -> aggr ('Null 'PGjsonb)

106−

107− {- |

108− the bitwise AND of all non-null input values, or null if none

109−

110− >>> :{

111− let

112− expression :: Expression '[] commons ('Grouped bys) schemas params '[tab ::: '["col" ::: null 'PGint4]] ('Null 'PGint4)

113− expression = bitAnd (Distinct #col)

114− in printSQL expression

115− :}

116− bit_and(DISTINCT "col")

117− -}

118− bitAnd

119− :: int `In` PGIntegral

120− => expr1 (null int)

121− -- ^ what to aggregate

122− -> aggr ('Null int)

123−

124− {- |

125− the bitwise OR of all non-null input values, or null if none

126−

127− >>> :{

128− let

129− expression :: Expression '[] commons ('Grouped bys) schemas params '[tab ::: '["col" ::: null 'PGint4]] ('Null 'PGint4)

130− expression = bitOr (All #col)

131− in printSQL expression

132− :}

133− bit_or(ALL "col")

134− -}

135− bitOr

136− :: int `In` PGIntegral

137− => expr1 (null int)

138− -- ^ what to aggregate

139− -> aggr ('Null int)

140−

141− {- |

142− true if all input values are true, otherwise false

143−

144− >>> :{

145− let

146− winFun :: WindowFunction '[] commons 'Ungrouped schemas params '[tab ::: '["col" ::: null 'PGbool]] ('Null 'PGbool)

147− winFun = boolAnd #col

148− in printSQL winFun

149− :}

150− bool_and("col")

151− -}

152− boolAnd

153− :: expr1 (null 'PGbool)

154− -- ^ what to aggregate

155− -> aggr ('Null 'PGbool)

156−

157− {- |

158− true if at least one input value is true, otherwise false

159−

160− >>> :{

161− let

162− expression :: Expression '[] commons ('Grouped bys) schemas params '[tab ::: '["col" ::: null 'PGbool]] ('Null 'PGbool)

163− expression = boolOr (All #col)

164− in printSQL expression

165− :}

166− bool_or(ALL "col")

167− -}

168− boolOr

169− :: expr1 (null 'PGbool)

170− -- ^ what to aggregate

171− -> aggr ('Null 'PGbool)

172−

173− {- |

174− equivalent to `boolAnd`

175−

176− >>> :{

177− let

178− expression :: Expression '[] commons ('Grouped bys) schemas params '[tab ::: '["col" ::: null 'PGbool]] ('Null 'PGbool)

179− expression = every (Distinct #col)

180− in printSQL expression

181− :}

182− every(DISTINCT "col")

183− -}

184− every

185− :: expr1 (null 'PGbool)

186− -- ^ what to aggregate

187− -> aggr ('Null 'PGbool)

188−

189− {- |maximum value of expression across all input values-}

190− max_

191− :: expr1 (null ty)

192− -- ^ what to maximize

193− -> aggr ('Null ty)

194−

195− -- | minimum value of expression across all input values

196− min_

197− :: expr1 (null ty)

198− -- ^ what to minimize

199− -> aggr ('Null ty)

200−

201− -- | the average (arithmetic mean) of all input values

202− avg

203− :: expr1 (null ty)

204− -- ^ what to average

205− -> aggr ('Null (PGAvg ty))

206−

207− {- | correlation coefficient

208−

209− >>> :{

210− let

211− expression :: Expression '[] c ('Grouped g) s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

212− expression = corr (All (#y *: #x))

213− in printSQL expression

214− :}

215− corr(ALL "y", "x")

216− -}

217− corr

218− :: exprN '[null 'PGfloat8, null 'PGfloat8]

219− -> aggr ('Null 'PGfloat8)

220−

221− {- | population covariance

222−

223− >>> :{

224− let

225− expression :: Expression '[] c ('Grouped g) s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

226− expression = covarPop (All (#y *: #x))

227− in printSQL expression

228− :}

229− covar_pop(ALL "y", "x")

230− -}

231− covarPop

232− :: exprN '[null 'PGfloat8, null 'PGfloat8]

233− -> aggr ('Null 'PGfloat8)

234−

235− {- | sample covariance

236−

237− >>> :{

238− let

239− winFun :: WindowFunction '[] c 'Ungrouped s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

240− winFun = covarSamp (#y *: #x)

241− in printSQL winFun

242− :}

243− covar_samp("y", "x")

244− -}

245− covarSamp

246− :: exprN '[null 'PGfloat8, null 'PGfloat8]

247− -> aggr ('Null 'PGfloat8)

248−

249− {- | average of the independent variable (sum(X)/N)

250−

251− >>> :{

252− let

253− expression :: Expression '[] c ('Grouped g) s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

254− expression = regrAvgX (All (#y *: #x))

255− in printSQL expression

256− :}

257− regr_avgx(ALL "y", "x")

258− -}

259− regrAvgX

260− :: exprN '[null 'PGfloat8, null 'PGfloat8]

261− -> aggr ('Null 'PGfloat8)

262−

263− {- | average of the dependent variable (sum(Y)/N)

264−

265− >>> :{

266− let

267− winFun :: WindowFunction '[] c 'Ungrouped s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

268− winFun = regrAvgY (#y *: #x)

269− in printSQL winFun

270− :}

271− regr_avgy("y", "x")

272− -}

273− regrAvgY

274− :: exprN '[null 'PGfloat8, null 'PGfloat8]

275− -> aggr ('Null 'PGfloat8)

276−

277− {- | number of input rows in which both expressions are nonnull

278−

279− >>> :{

280− let

281− winFun :: WindowFunction '[] c 'Ungrouped s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGint8)

282− winFun = regrCount (#y *: #x)

283− in printSQL winFun

284− :}

285− regr_count("y", "x")

286− -}

287− regrCount

288− :: exprN '[null 'PGfloat8, null 'PGfloat8]

289− -> aggr ('Null 'PGint8)

290−

291− {- | y-intercept of the least-squares-fit linear equation determined by the (X, Y) pairs

292− >>> :{

293− let

294− expression :: Expression '[] c ('Grouped g) s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

295− expression = regrIntercept (All (#y *: #x))

296− in printSQL expression

297− :}

298− regr_intercept(ALL "y", "x")

299− -}

300− regrIntercept

301− :: exprN '[null 'PGfloat8, null 'PGfloat8]

302− -> aggr ('Null 'PGfloat8)

303−

304− -- | @regr_r2(Y, X)@, square of the correlation coefficient

305− regrR2

306− :: exprN '[null 'PGfloat8, null 'PGfloat8]

307− -> aggr ('Null 'PGfloat8)

308−

309− -- | @regr_slope(Y, X)@, slope of the least-squares-fit linear equation

310− -- determined by the (X, Y) pairs

311− regrSlope

312− :: exprN '[null 'PGfloat8, null 'PGfloat8]

313− -> aggr ('Null 'PGfloat8)

314−

315− -- | @regr_sxx(Y, X)@, sum(X^2) - sum(X)^2/N

316− -- (“sum of squares” of the independent variable)

317− regrSxx

318− :: exprN '[null 'PGfloat8, null 'PGfloat8]

319− -> aggr ('Null 'PGfloat8)

320−

321− -- | @regr_sxy(Y, X)@, sum(X*Y) - sum(X) * sum(Y)/N

322− -- (“sum of products” of independent times dependent variable)

323− regrSxy

324− :: exprN '[null 'PGfloat8, null 'PGfloat8]

325− -> aggr ('Null 'PGfloat8)

326−

327− -- | @regr_syy(Y, X)@, sum(Y^2) - sum(Y)^2/N

328− -- (“sum of squares” of the dependent variable)

329− regrSyy

330− :: exprN '[null 'PGfloat8, null 'PGfloat8]

331− -> aggr ('Null 'PGfloat8)

332−

333− -- | historical alias for `stddevSamp`

334− stddev

335− :: expr1 (null ty)

336− -> aggr ('Null (PGAvg ty))

337−

338− -- | population standard deviation of the input values

339− stddevPop

340− :: expr1 (null ty)

341− -> aggr ('Null (PGAvg ty))

342−

343− -- | sample standard deviation of the input values

344− stddevSamp

345− :: expr1 (null ty)

346− -> aggr ('Null (PGAvg ty))

347−

348− -- | historical alias for `varSamp`

349− variance

350− :: expr1 (null ty)

351− -> aggr ('Null (PGAvg ty))

352−

353− -- | population variance of the input values

354− -- (square of the population standard deviation)

355− varPop

356− :: expr1 (null ty)

357− -> aggr ('Null (PGAvg ty))

358−

359− -- | sample variance of the input values

360− -- (square of the sample standard deviation)

361− varSamp

362− :: expr1 (null ty)

363− -> aggr ('Null (PGAvg ty))

364−

365−{- |

366−`Distinction`s are used for the input of `Aggregate` `Expression`s.

367−`All` invokes the aggregate once for each input row.

368−`Distinct` invokes the aggregate once for each distinct value of the expression

369−(or distinct set of values, for multiple expressions) found in the input

370−-}

371−data Distinction (expr :: kind -> Type) (ty :: kind)

372− = All (expr ty)

373− | Distinct (expr ty)

374− deriving (GHC.Generic,Show,Eq,Ord)

375−instance NFData (Distinction (Expression outer commons grp schemas params from) ty)

376−instance RenderSQL (Distinction (Expression outer commons grp schemas params from) ty) where

377− renderSQL = \case

378− All x -> "ALL" <+> renderSQL x

379− Distinct x -> "DISTINCT" <+> renderSQL x

380−instance SOP.SListI tys => RenderSQL

381− (Distinction (NP (Expression outer commons grp schemas params from)) tys) where

382− renderSQL = \case

383− All xs -> "ALL" <+> renderCommaSeparated renderSQL xs

384− Distinct xs -> "DISTINCT" <+> renderCommaSeparated renderSQL xs

385−

386−instance Aggregate

387− (Distinction (Expression outer commons 'Ungrouped schemas params from))

388− (Distinction (NP (Expression outer commons 'Ungrouped schemas params from)))

389− (Expression outer commons ('Grouped bys) schemas params from) where

390− countStar = UnsafeExpression "count(*)"

391− count = unsafeAggregate1 "count"

392− sum_ = unsafeAggregate1 "sum"

393− arrayAgg = unsafeAggregate1 "array_agg"

394− jsonAgg = unsafeAggregate1 "json_agg"

395− jsonbAgg = unsafeAggregate1 "jsonb_agg"

396− bitAnd = unsafeAggregate1 "bit_and"

397− bitOr = unsafeAggregate1 "bit_or"

398− boolAnd = unsafeAggregate1 "bool_and"

399− boolOr = unsafeAggregate1 "bool_or"

400− every = unsafeAggregate1 "every"

401− max_ = unsafeAggregate1 "max"

402− min_ = unsafeAggregate1 "min"

403− avg = unsafeAggregate1 "avg"

404− corr = unsafeAggregateN "corr"

405− covarPop = unsafeAggregateN "covar_pop"

406− covarSamp = unsafeAggregateN "covar_samp"

407− regrAvgX = unsafeAggregateN "regr_avgx"

408− regrAvgY = unsafeAggregateN "regr_avgy"

409− regrCount = unsafeAggregateN "regr_count"

410− regrIntercept = unsafeAggregateN "regr_intercept"

411− regrR2 = unsafeAggregateN "regr_r2"

412− regrSlope = unsafeAggregateN "regr_slope"

413− regrSxx = unsafeAggregateN "regr_sxx"

414− regrSxy = unsafeAggregateN "regr_sxy"

415− regrSyy = unsafeAggregateN "regr_syy"

416− stddev = unsafeAggregate1 "stddev"

417− stddevPop = unsafeAggregate1 "stddev_pop"

418− stddevSamp = unsafeAggregate1 "stddev_samp"

419− variance = unsafeAggregate1 "variance"

420− varPop = unsafeAggregate1 "var_pop"

421− varSamp = unsafeAggregate1 "var_samp"

422−

423−-- | escape hatch to define aggregate functions

424−unsafeAggregate1

425− :: ByteString -- ^ aggregate function

426− -> Distinction (Expression outer commons 'Ungrouped schemas params from) x

427− -> Expression outer commons ('Grouped bys) schemas params from y

428−unsafeAggregate1 fun x = UnsafeExpression $ fun <> parenthesized (renderSQL x)

429−

430−unsafeAggregateN

431− :: SOP.SListI xs

432− => ByteString -- ^ function

433− -> Distinction (NP (Expression outer commons 'Ungrouped schemas params from)) xs

434− -> Expression outer commons ('Grouped bys) schemas params from y

435−unsafeAggregateN fun xs = UnsafeExpression $ fun <> parenthesized (renderSQL xs)

436−

437−-- | A type family that calculates `PGSum``PGType` of

438−-- a given argument `PGType`.

439−type family PGSum ty where

440− PGSum 'PGint2 = 'PGint8

441− PGSum 'PGint4 = 'PGint8

442− PGSum 'PGint8 = 'PGnumeric

443− PGSum 'PGfloat4 = 'PGfloat4

444− PGSum 'PGfloat8 = 'PGfloat8

445− PGSum 'PGnumeric = 'PGnumeric

446− PGSum 'PGinterval = 'PGinterval

447− PGSum 'PGmoney = 'PGmoney

448− PGSum pg = TypeError

449− ( 'Text "Squeal type error: Cannot sum with argument type "

450− ':<>: 'ShowType pg )

451−

452−-- | A type family that calculates `PGAvg` type of a `PGType`.

453−type family PGAvg ty where

454− PGAvg 'PGint2 = 'PGnumeric

455− PGAvg 'PGint4 = 'PGnumeric

456− PGAvg 'PGint8 = 'PGnumeric

457− PGAvg 'PGnumeric = 'PGnumeric

458− PGAvg 'PGfloat4 = 'PGfloat8

459− PGAvg 'PGfloat8 = 'PGfloat8

460− PGAvg 'PGinterval = 'PGinterval

461− PGAvg pg = TypeError

462− ('Text "Squeal type error: No average for " ':<>: 'ShowType pg)

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Collection.hsdeleted−169

@@ -1,169 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Collection

3−Description: Array and composite functions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Array and composite functions

9−-}

10−

11−{-# LANGUAGE

12− AllowAmbiguousTypes

13− , DataKinds

14− , FlexibleContexts

15− , FlexibleInstances

16− , MultiParamTypeClasses

17− , OverloadedLabels

18− , OverloadedStrings

19− , RankNTypes

20− , ScopedTypeVariables

21− , TypeApplications

22− , TypeFamilies

23− , TypeOperators

24− , UndecidableInstances

25−#-}

26−

27−module Squeal.PostgreSQL.Expression.Collection

28− ( array

29− , array1

30− , array2

31− , cardinality

32− , index

33− , unnest

34− , row

35− , field

36− ) where

37−

38−import Data.String

39−import Data.Word (Word64)

40−

41−import qualified Generics.SOP as SOP

42−

43−import Squeal.PostgreSQL.Alias

44−import Squeal.PostgreSQL.Expression

45−import Squeal.PostgreSQL.Expression.Set

46−import Squeal.PostgreSQL.List

47−import Squeal.PostgreSQL.Render

48−import Squeal.PostgreSQL.Schema

49−

50−-- $setup

51−-- >>> import Squeal.PostgreSQL

52−

53−-- | >>> printSQL $ array [null_, false, true]

54−-- ARRAY[NULL, FALSE, TRUE]

55−array

56− :: [Expression outer commons grp schemas params from ty]

57− -- ^ array elements

58− -> Expression outer commons grp schemas params from (null ('PGvararray ty))

59−array xs = UnsafeExpression $ "ARRAY" <>

60− bracketed (commaSeparated (renderSQL <$> xs))

61−

62−{- | construct a 1-dimensional fixed length array

63−

64−>>> printSQL $ array1 (null_ :* false *: true)

65−ARRAY[NULL, FALSE, TRUE]

66−

67−>>> :type array1 (null_ :* false *: true)

68−array1 (null_ :* false *: true)

69− :: Expression

70− outer

71− commons

72− grp

73− schemas

74− params

75− from

76− (null ('PGfixarray '[3] ('Null 'PGbool)))

77−-}

78−array1

79− :: (n ~ Length tys, SOP.All ((~) ty) tys)

80− => NP (Expression outer commons grp schemas params from) tys

81− -> Expression outer commons grp schemas params from (null ('PGfixarray '[n] ty))

82−array1 xs = UnsafeExpression $ "ARRAY" <>

83− bracketed (renderCommaSeparated renderSQL xs)

84−

85−{- | construct a 2-dimensional fixed length array

86−

87−>>> printSQL $ array2 ((null_ :* false *: true) *: (false :* null_ *: true))

88−ARRAY[[NULL, FALSE, TRUE], [FALSE, NULL, TRUE]]

89−

90−>>> :type array2 ((null_ :* false *: true) *: (false :* null_ *: true))

91−array2 ((null_ :* false *: true) *: (false :* null_ *: true))

92− :: Expression

93− outer

94− commons

95− grp

96− schemas

97− params

98− from

99− (null ('PGfixarray '[2, 3] ('Null 'PGbool)))

100−-}

101−array2

102− :: ( SOP.All ((~) tys) tyss

103− , SOP.All SOP.SListI tyss

104− , Length tyss ~ n1

105− , SOP.All ((~) ty) tys

106− , Length tys ~ n2 )

107− => NP (NP (Expression outer commons grp schemas params from)) tyss

108− -> Expression outer commons grp schemas params from (null ('PGfixarray '[n1,n2] ty))

109−array2 xss = UnsafeExpression $ "ARRAY" <>

110− bracketed (renderCommaSeparatedConstraint @SOP.SListI (bracketed . renderCommaSeparated renderSQL) xss)

111−

112−-- | >>> printSQL $ cardinality (array [null_, false, true])

113−-- cardinality(ARRAY[NULL, FALSE, TRUE])

114−cardinality :: null ('PGvararray ty) --> null 'PGint8

115−cardinality = unsafeFunction "cardinality"

116−

117−-- | >>> printSQL $ array [null_, false, true] & index 2

118−-- (ARRAY[NULL, FALSE, TRUE])[2]

119−index

120− :: Word64 -- ^ index

121− -> null ('PGvararray ty) --> NullifyType ty

122−index n expr = UnsafeExpression $

123− parenthesized (renderSQL expr) <> "[" <> fromString (show n) <> "]"

124−

125−-- | Expand an array to a set of rows

126−unnest :: SetFunction "unnest" (null ('PGvararray ty)) '["unnest" ::: ty]

127−unnest = unsafeSetFunction

128−

129−-- | A row constructor is an expression that builds a row value

130−-- (also called a composite value) using values for its member fields.

131−--

132−-- >>> :{

133−-- type Complex = 'PGcomposite

134−-- '[ "real" ::: 'NotNull 'PGfloat8

135−-- , "imaginary" ::: 'NotNull 'PGfloat8 ]

136−-- :}

137−--

138−-- >>> let i = row (0 `as` #real :* 1 `as` #imaginary) :: Expression outer commons grp schemas params from ('NotNull Complex)

139−-- >>> printSQL i

140−-- ROW(0, 1)

141−row

142− :: SOP.SListI row

143− => NP (Aliased (Expression outer commons grp schemas params from)) row

144− -- ^ zero or more expressions for the row field values

145− -> Expression outer commons grp schemas params from (null ('PGcomposite row))

146−row exprs = UnsafeExpression $ "ROW" <> parenthesized

147− (renderCommaSeparated (\ (expr `As` _) -> renderSQL expr) exprs)

148−

149−-- | >>> :{

150−-- type Complex = 'PGcomposite

151−-- '[ "real" ::: 'NotNull 'PGfloat8

152−-- , "imaginary" ::: 'NotNull 'PGfloat8 ]

153−-- type Schema = '["complex" ::: 'Typedef Complex]

154−-- :}

155−--

156−-- >>> let i = row (0 `as` #real :* 1 `as` #imaginary) :: Expression outer '[] grp (Public Schema) from params ('NotNull Complex)

157−-- >>> printSQL $ i & field #complex #imaginary

158−-- (ROW(0, 1)::"complex")."imaginary"

159−field

160− :: ( Has sch schemas schema

161− , Has tydef schema ('Typedef ('PGcomposite row))

162− , Has field row ty)

163− => QualifiedAlias sch tydef -- ^ row type

164− -> Alias field -- ^ field name

165− -> Expression outer commons grp schemas params from ('NotNull ('PGcomposite row))

166− -> Expression outer commons grp schemas params from ty

167−field td fld expr = UnsafeExpression $

168− parenthesized (renderSQL expr <> "::" <> renderSQL td)

169− <> "." <> renderSQL fld

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Comparison.hsdeleted−206

@@ -1,206 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Comparison

3−Description: Comparison expressions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Comparison functions and operators

9−-}

10−

11−{-# LANGUAGE

12− OverloadedStrings

13− , RankNTypes

14− , TypeInType

15− , TypeOperators

16−#-}

17−

18−module Squeal.PostgreSQL.Expression.Comparison

19− ( (.==)

20− , (./=)

21− , (.>=)

22− , (.<)

23− , (.<=)

24− , (.>)

25− , greatest

26− , least

27− , BetweenExpr

28− , between

29− , notBetween

30− , betweenSymmetric

31− , notBetweenSymmetric

32− , isDistinctFrom

33− , isNotDistinctFrom

34− , isTrue

35− , isNotTrue

36− , isFalse

37− , isNotFalse

38− , isUnknown

39− , isNotUnknown

40− ) where

41−

42−import Data.ByteString

43−

44−import Squeal.PostgreSQL.Expression

45−import Squeal.PostgreSQL.Expression.Logic

46−import Squeal.PostgreSQL.Render

47−import Squeal.PostgreSQL.Schema

48−

49−-- $setup

50−-- >>> import Squeal.PostgreSQL

51−

52−-- | Comparison operations like `.==`, `./=`, `.>`, `.>=`, `.<` and `.<=`

53−-- will produce @NULL@s if one of their arguments is @NULL@.

54−--

55−-- >>> printSQL $ true .== null_

56−-- (TRUE = NULL)

57−(.==) :: Operator (null0 ty) (null1 ty) ('Null 'PGbool)

58−(.==) = unsafeBinaryOp "="

59−infix 4 .==

60−

61−-- | >>> printSQL $ true ./= null_

62−-- (TRUE <> NULL)

63−(./=) :: Operator (null0 ty) (null1 ty) ('Null 'PGbool)

64−(./=) = unsafeBinaryOp "<>"

65−infix 4 ./=

66−

67−-- | >>> printSQL $ true .>= null_

68−-- (TRUE >= NULL)

69−(.>=) :: Operator (null0 ty) (null1 ty) ('Null 'PGbool)

70−(.>=) = unsafeBinaryOp ">="

71−infix 4 .>=

72−

73−-- | >>> printSQL $ true .< null_

74−-- (TRUE < NULL)

75−(.<) :: Operator (null0 ty) (null1 ty) ('Null 'PGbool)

76−(.<) = unsafeBinaryOp "<"

77−infix 4 .<

78−

79−-- | >>> printSQL $ true .<= null_

80−-- (TRUE <= NULL)

81−(.<=) :: Operator (null0 ty) (null1 ty) ('Null 'PGbool)

82−(.<=) = unsafeBinaryOp "<="

83−infix 4 .<=

84−

85−-- | >>> printSQL $ true .> null_

86−-- (TRUE > NULL)

87−(.>) :: Operator (null0 ty) (null1 ty) ('Null 'PGbool)

88−(.>) = unsafeBinaryOp ">"

89−infix 4 .>

90−

91−-- | >>> let expr = greatest [param @1] currentTimestamp :: Expression outer commons grp schemas '[ 'NotNull 'PGtimestamptz] from ('NotNull 'PGtimestamptz)

92−-- >>> printSQL expr

93−-- GREATEST(($1 :: timestamp with time zone), CURRENT_TIMESTAMP)

94−greatest :: FunctionVar ty ty ty

95−greatest = unsafeFunctionVar "GREATEST"

96−

97−-- | >>> printSQL $ least [null_] currentTimestamp

98−-- LEAST(NULL, CURRENT_TIMESTAMP)

99−least :: FunctionVar ty ty ty

100−least = unsafeFunctionVar "LEAST"

101−

102−{- |

103−A @RankNType@ for comparison expressions like `between`.

104−-}

105−type BetweenExpr

106− = forall outer commons grp schemas params from ty

107− . Expression outer commons grp schemas params from ty

108− -> ( Expression outer commons grp schemas params from ty

109− , Expression outer commons grp schemas params from ty ) -- ^ bounds

110− -> Condition outer commons grp schemas params from

111−

112−unsafeBetweenExpr :: ByteString -> BetweenExpr

113−unsafeBetweenExpr fun a (x,y) = UnsafeExpression $

114− renderSQL a <+> fun <+> renderSQL x <+> "AND" <+> renderSQL y

115−

116−{- | >>> printSQL $ true `between` (null_, false)

117−TRUE BETWEEN NULL AND FALSE

118−-}

119−between :: BetweenExpr

120−between = unsafeBetweenExpr "BETWEEN"

121−

122−{- | >>> printSQL $ true `notBetween` (null_, false)

123−TRUE NOT BETWEEN NULL AND FALSE

124−-}

125−notBetween :: BetweenExpr

126−notBetween = unsafeBetweenExpr "NOT BETWEEN"

127−

128−{- | between, after sorting the comparison values

129−

130−>>> printSQL $ true `betweenSymmetric` (null_, false)

131−TRUE BETWEEN SYMMETRIC NULL AND FALSE

132−-}

133−betweenSymmetric :: BetweenExpr

134−betweenSymmetric = unsafeBetweenExpr "BETWEEN SYMMETRIC"

135−

136−{- | not between, after sorting the comparison values

137−

138−>>> printSQL $ true `notBetweenSymmetric` (null_, false)

139−TRUE NOT BETWEEN SYMMETRIC NULL AND FALSE

140−-}

141−notBetweenSymmetric :: BetweenExpr

142−notBetweenSymmetric = unsafeBetweenExpr "NOT BETWEEN SYMMETRIC"

143−

144−{- | not equal, treating null like an ordinary value

145−

146−>>> printSQL $ true `isDistinctFrom` null_

147−(TRUE IS DISTINCT FROM NULL)

148−-}

149−isDistinctFrom :: Operator (null0 ty) (null1 ty) ('Null 'PGbool)

150−isDistinctFrom = unsafeBinaryOp "IS DISTINCT FROM"

151−

152−{- | equal, treating null like an ordinary value

153−

154−>>> printSQL $ true `isNotDistinctFrom` null_

155−(TRUE IS NOT DISTINCT FROM NULL)

156−-}

157−isNotDistinctFrom :: Operator (null0 ty) (null1 ty) ('NotNull 'PGbool)

158−isNotDistinctFrom = unsafeBinaryOp "IS NOT DISTINCT FROM"

159−

160−{- | is true

161−

162−>>> printSQL $ true & isTrue

163−(TRUE IS TRUE)

164−-}

165−isTrue :: null0 'PGbool --> null1 'PGbool

166−isTrue = unsafeRightOp "IS TRUE"

167−

168−{- | is false or unknown

169−

170−>>> printSQL $ true & isNotTrue

171−(TRUE IS NOT TRUE)

172−-}

173−isNotTrue :: null0 'PGbool --> null1 'PGbool

174−isNotTrue = unsafeRightOp "IS NOT TRUE"

175−

176−{- | is false

177−

178−>>> printSQL $ true & isFalse

179−(TRUE IS FALSE)

180−-}

181−isFalse :: null0 'PGbool --> null1 'PGbool

182−isFalse = unsafeRightOp "IS FALSE"

183−

184−{- | is true or unknown

185−

186−>>> printSQL $ true & isNotFalse

187−(TRUE IS NOT FALSE)

188−-}

189−isNotFalse :: null0 'PGbool --> null1 'PGbool

190−isNotFalse = unsafeRightOp "IS NOT FALSE"

191−

192−{- | is unknown

193−

194−>>> printSQL $ true & isUnknown

195−(TRUE IS UNKNOWN)

196−-}

197−isUnknown :: null0 'PGbool --> null1 'PGbool

198−isUnknown = unsafeRightOp "IS UNKNOWN"

199−

200−{- | is true or false

201−

202−>>> printSQL $ true & isNotUnknown

203−(TRUE IS NOT UNKNOWN)

204−-}

205−isNotUnknown :: null0 'PGbool --> null1 'PGbool

206−isNotUnknown = unsafeRightOp "IS NOT UNKNOWN"

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Json.hsdeleted−462

@@ -1,462 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Json

3−Description: Json and Jsonb functions and operators

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Json and Jsonb functions and operators

9−-}

10−

11−{-# LANGUAGE

12− DataKinds

13− , FlexibleContexts

14− , FlexibleInstances

15− , GADTs

16− , OverloadedLabels

17− , OverloadedStrings

18− , PolyKinds

19− , RankNTypes

20− , ScopedTypeVariables

21− , TypeApplications

22− , TypeOperators

23− , UndecidableInstances

24− , UndecidableSuperClasses

25−#-}

26−

27−module Squeal.PostgreSQL.Expression.Json

28− ( -- * Json and Jsonb operators

29− (.->)

30− , (.->>)

31− , (.#>)

32− , (.#>>)

33− -- * Jsonb operators

34− , (.?)

35− , (.?|)

36− , (.?&)

37− , (.-.)

38− , (#-.)

39− -- * Json and Jsonb functions

40− , toJson

41− , toJsonb

42− , arrayToJson

43− , rowToJson

44− , jsonBuildArray

45− , jsonbBuildArray

46− , JsonBuildObject (..)

47− , jsonObject

48− , jsonbObject

49− , jsonZipObject

50− , jsonbZipObject

51− , jsonArrayLength

52− , jsonbArrayLength

53− , jsonTypeof

54− , jsonbTypeof

55− , jsonStripNulls

56− , jsonbStripNulls

57− , jsonbSet

58− , jsonbInsert

59− , jsonbPretty

60− -- * Json and Jsonb set returning functions

61− , jsonEach

62− , jsonbEach

63− , jsonEachText

64− , jsonbEachText

65− , jsonObjectKeys

66− , jsonbObjectKeys

67− , JsonPopulateFunction

68− , jsonPopulateRecord

69− , jsonbPopulateRecord

70− , jsonPopulateRecordSet

71− , jsonbPopulateRecordSet

72− , JsonToRecordFunction

73− , jsonToRecord

74− , jsonbToRecord

75− , jsonToRecordSet

76− , jsonbToRecordSet

77− ) where

78−

79−import Data.ByteString (ByteString)

80−import GHC.TypeLits

81−

82−import Squeal.PostgreSQL.Alias

83−import Squeal.PostgreSQL.Expression

84−import Squeal.PostgreSQL.Expression.Set

85−import Squeal.PostgreSQL.Expression.Type

86−import Squeal.PostgreSQL.List

87−import Squeal.PostgreSQL.Query

88−import Squeal.PostgreSQL.Render

89−import Squeal.PostgreSQL.Schema

90−

91−import qualified Generics.SOP as SOP

92−

93−-- $setup

94−-- >>> import Squeal.PostgreSQL

95−-- >>> import Data.Aeson

96−

97−{-----------------------------------------

98− -- json and jsonb support

99−

100−See https://www.postgresql.org/docs/10/static/functions-json.html -- most

101−comments lifted directly from this page.

102−

103−Table 9.44: json and jsonb operators

104−-----------------------------------------}

105−

106−-- | Get JSON value (object field or array element) at a key.

107−(.->)

108− :: (json `In` PGJsonType, key `In` PGJsonKey)

109− => Operator (null json) (null key) ('Null json)

110−infixl 8 .->

111−(.->) = unsafeBinaryOp "->"

112−

113−-- | Get JSON value (object field or array element) at a key, as text.

114−(.->>)

115− :: (json `In` PGJsonType, key `In` PGJsonKey)

116− => Operator (null json) (null key) ('Null 'PGtext)

117−infixl 8 .->>

118−(.->>) = unsafeBinaryOp "->>"

119−

120−-- | Get JSON value at a specified path.

121−(.#>)

122− :: json `In` PGJsonType

123− => Operator (null json) (null ('PGvararray ('NotNull 'PGtext))) ('Null json)

124−infixl 8 .#>

125−(.#>) = unsafeBinaryOp "#>"

126−

127−-- | Get JSON value at a specified path as text.

128−(.#>>)

129− :: json `In` PGJsonType

130− => Operator (null json) (null ('PGvararray ('NotNull 'PGtext))) ('Null 'PGtext)

131−infixl 8 .#>>

132−(.#>>) = unsafeBinaryOp "#>>"

133−

134−-- Additional jsonb operators

135−

136−-- | Does the string exist as a top-level key within the JSON value?

137−(.?) :: Operator (null 'PGjsonb) (null 'PGtext) ('Null 'PGbool)

138−infixl 9 .?

139−(.?) = unsafeBinaryOp "?"

140−

141−-- | Do any of these array strings exist as top-level keys?

142−(.?|) :: Operator

143− (null 'PGjsonb)

144− (null ('PGvararray ('NotNull 'PGtext)))

145− ('Null 'PGbool)

146−infixl 9 .?|

147−(.?|) = unsafeBinaryOp "?|"

148−

149−-- | Do all of these array strings exist as top-level keys?

150−(.?&) :: Operator

151− (null 'PGjsonb)

152− (null ('PGvararray ('NotNull 'PGtext)))

153− ('Null 'PGbool)

154−infixl 9 .?&

155−(.?&) = unsafeBinaryOp "?&"

156−

157−-- | Delete a key or keys from a JSON object, or remove an array element.

158−--

159−-- If the right operand is

160−--

161−-- @ text @: Delete key / value pair or string element from left operand.

162−-- Key / value pairs are matched based on their key value,

163−--

164−-- @ text[] @: Delete multiple key / value pairs or string elements

165−-- from left operand. Key / value pairs are matched based on their key value,

166−--

167−-- @ integer @: Delete the array element with specified index (Negative integers

168−-- count from the end). Throws an error if top level container is not an array.

169−(.-.)

170− :: key `In` '[ 'PGtext, 'PGvararray ('NotNull 'PGtext), 'PGint4, 'PGint2 ]

171− => Operator (null 'PGjsonb) (null key) (null 'PGjsonb)

172−infixl 6 .-.

173−(.-.) = unsafeBinaryOp "-"

174−

175−-- | Delete the field or element with specified path (for JSON arrays, negative

176−-- integers count from the end)

177−(#-.) :: Operator (null 'PGjsonb) (null ('PGvararray ('NotNull 'PGtext))) (null 'PGjsonb)

178−infixl 6 #-.

179−(#-.) = unsafeBinaryOp "#-"

180−

181−{-----------------------------------------

182−Table 9.45: JSON creation functions

183−-----------------------------------------}

184−

185−-- | Returns the value as json. Arrays and composites are converted

186−-- (recursively) to arrays and objects; otherwise, if there is a cast from the

187−-- type to json, the cast function will be used to perform the conversion;

188−-- otherwise, a scalar value is produced. For any scalar type other than a

189−-- number, a Boolean, or a null value, the text representation will be used, in

190−-- such a fashion that it is a valid json value.

191−toJson :: null ty --> null 'PGjson

192−toJson = unsafeFunction "to_json"

193−

194−-- | Returns the value as jsonb. Arrays and composites are converted

195−-- (recursively) to arrays and objects; otherwise, if there is a cast from the

196−-- type to json, the cast function will be used to perform the conversion;

197−-- otherwise, a scalar value is produced. For any scalar type other than a

198−-- number, a Boolean, or a null value, the text representation will be used, in

199−-- such a fashion that it is a valid jsonb value.

200−toJsonb :: null ty --> null 'PGjsonb

201−toJsonb = unsafeFunction "to_jsonb"

202−

203−-- | Returns the array as a JSON array. A PostgreSQL multidimensional array

204−-- becomes a JSON array of arrays.

205−arrayToJson :: null ('PGvararray ty) --> null 'PGjson

206−arrayToJson = unsafeFunction "array_to_json"

207−

208−-- | Returns the row as a JSON object.

209−rowToJson :: null ('PGcomposite ty) --> null 'PGjson

210−rowToJson = unsafeFunction "row_to_json"

211−

212−-- | Builds a possibly-heterogeneously-typed JSON array out of a variadic

213−-- argument list.

214−jsonBuildArray :: SOP.SListI tuple => tuple ---> null 'PGjson

215−jsonBuildArray = unsafeFunctionN "json_build_array"

216−

217−-- | Builds a possibly-heterogeneously-typed (binary) JSON array out of a

218−-- variadic argument list.

219−jsonbBuildArray :: SOP.SListI tuple => tuple ---> null 'PGjsonb

220−jsonbBuildArray = unsafeFunctionN "jsonb_build_array"

221−

222−-- | Builds a possibly-heterogeneously-typed JSON object out of a variadic

223−-- argument list. The elements of the argument list must alternate between text

224−-- and values.

225−class SOP.SListI tys => JsonBuildObject tys where

226−

227− jsonBuildObject :: tys ---> null 'PGjson

228− jsonBuildObject = unsafeFunctionN "json_build_object"

229−

230− jsonbBuildObject :: tys ---> null 'PGjsonb

231− jsonbBuildObject = unsafeFunctionN "jsonb_build_object"

232−

233−instance JsonBuildObject '[]

234−instance (JsonBuildObject tys, key `In` PGJsonKey)

235− => JsonBuildObject ('NotNull key ': value ': tys)

236−

237−-- | Builds a JSON object out of a text array.

238−-- The array must have two dimensions

239−-- such that each inner array has exactly two elements,

240−-- which are taken as a key/value pair.

241−jsonObject

242− :: null ('PGfixarray '[n,2] ('NotNull 'PGtext))

243− --> null 'PGjson

244−jsonObject = unsafeFunction "json_object"

245−

246−-- | Builds a binary JSON object out of a text array.

247−-- The array must have two dimensions

248−-- such that each inner array has exactly two elements,

249−-- which are taken as a key/value pair.

250−jsonbObject

251− :: null ('PGfixarray '[n,2] ('NotNull 'PGtext))

252− --> null 'PGjsonb

253−jsonbObject = unsafeFunction "jsonb_object"

254−

255−-- | This is an alternate form of 'jsonObject' that takes two arrays; one for

256−-- keys and one for values, that are zipped pairwise to create a JSON object.

257−jsonZipObject ::

258− '[ null ('PGvararray ('NotNull 'PGtext))

259− , null ('PGvararray ('NotNull 'PGtext)) ]

260− ---> null 'PGjson

261−jsonZipObject = unsafeFunctionN "json_object"

262−

263−-- | This is an alternate form of 'jsonbObject' that takes two arrays; one for

264−-- keys and one for values, that are zipped pairwise to create a binary JSON

265−-- object.

266−jsonbZipObject ::

267− '[ null ('PGvararray ('NotNull 'PGtext))

268− , null ('PGvararray ('NotNull 'PGtext)) ]

269− ---> null 'PGjsonb

270−jsonbZipObject = unsafeFunctionN "jsonb_object"

271−

272−{-----------------------------------------

273−Table 9.46: JSON processing functions

274−-----------------------------------------}

275−

276−-- | Returns the number of elements in the outermost JSON array.

277−jsonArrayLength :: null 'PGjson --> null 'PGint4

278−jsonArrayLength = unsafeFunction "json_array_length"

279−

280−-- | Returns the number of elements in the outermost binary JSON array.

281−jsonbArrayLength :: null 'PGjsonb --> null 'PGint4

282−jsonbArrayLength = unsafeFunction "jsonb_array_length"

283−

284−-- | Returns the type of the outermost JSON value as a text string. Possible

285−-- types are object, array, string, number, boolean, and null.

286−jsonTypeof :: null 'PGjson --> null 'PGtext

287−jsonTypeof = unsafeFunction "json_typeof"

288−

289−-- | Returns the type of the outermost binary JSON value as a text string.

290−-- Possible types are object, array, string, number, boolean, and null.

291−jsonbTypeof :: null 'PGjsonb --> null 'PGtext

292−jsonbTypeof = unsafeFunction "jsonb_typeof"

293−

294−-- | Returns its argument with all object fields that have null values omitted.

295−-- Other null values are untouched.

296−jsonStripNulls :: null 'PGjson --> null 'PGjson

297−jsonStripNulls = unsafeFunction "json_strip_nulls"

298−

299−-- | Returns its argument with all object fields that have null values omitted.

300−-- Other null values are untouched.

301−jsonbStripNulls :: null 'PGjsonb --> null 'PGjsonb

302−jsonbStripNulls = unsafeFunction "jsonb_strip_nulls"

303−

304−-- | @ jsonbSet target path new_value create_missing @

305−--

306−-- Returns target with the section designated by path replaced by @new_value@,

307−-- or with @new_value@ added if create_missing is

308−-- `Squeal.PostgreSQL.Expression.Logic.true` and the

309−-- item designated by path does not exist. As with the path orientated

310−-- operators, negative integers that appear in path count from the end of JSON

311−-- arrays.

312−jsonbSet ::

313− '[ null 'PGjsonb, null ('PGvararray ('NotNull 'PGtext))

314− , null 'PGjsonb, null 'PGbool ] ---> null 'PGjsonb

315−jsonbSet = unsafeFunctionN "jsonbSet"

316−

317−-- | @ jsonbInsert target path new_value insert_after @

318−--

319−-- Returns target with @new_value@ inserted. If target section designated by

320−-- path is in a JSONB array, @new_value@ will be inserted before target or after

321−-- if @insert_after@ is `Squeal.PostgreSQL.Expression.Logic.true`.

322−-- If target section designated by

323−-- path is in JSONB object, @new_value@ will be inserted only if target does not

324−-- exist. As with the path orientated operators, negative integers that appear

325−-- in path count from the end of JSON arrays.

326−jsonbInsert ::

327− '[ null 'PGjsonb, null ('PGvararray ('NotNull 'PGtext))

328− , null 'PGjsonb, null 'PGbool ] ---> null 'PGjsonb

329−jsonbInsert = unsafeFunctionN "jsonb_insert"

330−

331−-- | Returns its argument as indented JSON text.

332−jsonbPretty :: null 'PGjsonb --> null 'PGtext

333−jsonbPretty = unsafeFunction "jsonb_pretty"

334−

335−{- | Expands the outermost JSON object into a set of key/value pairs.

336−

337−>>> printSQL (select Star (from (jsonEach (literal (Json (object ["a" .= "foo", "b" .= "bar"]))))))

338−SELECT * FROM json_each(('{"a":"foo","b":"bar"}' :: json))

339−-}

340−jsonEach :: SetFunction "json_each" (null 'PGjson)

341− '["key" ::: 'NotNull 'PGtext, "value" ::: 'NotNull 'PGjson]

342−jsonEach = unsafeSetFunction

343−

344−{- | Expands the outermost binary JSON object into a set of key/value pairs.

345−

346−>>> printSQL (select Star (from (jsonbEach (literal (Jsonb (object ["a" .= "foo", "b" .= "bar"]))))))

347−SELECT * FROM jsonb_each(('{"a":"foo","b":"bar"}' :: jsonb))

348−-}

349−jsonbEach

350− :: SetFunction "jsonb_each" (nullity 'PGjsonb)

351− '["key" ::: 'NotNull 'PGtext, "value" ::: 'NotNull 'PGjson]

352−jsonbEach = unsafeSetFunction

353−

354−{- | Expands the outermost JSON object into a set of key/value pairs.

355−

356−>>> printSQL (select Star (from (jsonEachText (literal (Json (object ["a" .= "foo", "b" .= "bar"]))))))

357−SELECT * FROM json_each_text(('{"a":"foo","b":"bar"}' :: json))

358−-}

359−jsonEachText

360− :: SetFunction "json_each_text" (null 'PGjson)

361− '["key" ::: 'NotNull 'PGtext, "value" ::: 'NotNull 'PGtext]

362−jsonEachText = unsafeSetFunction

363−

364−{- | Expands the outermost binary JSON object into a set of key/value pairs.

365−

366−>>> printSQL (select Star (from (jsonbEachText (literal (Jsonb (object ["a" .= "foo", "b" .= "bar"]))))))

367−SELECT * FROM jsonb_each_text(('{"a":"foo","b":"bar"}' :: jsonb))

368−-}

369−jsonbEachText

370− :: SetFunction "jsonb_each_text" (null 'PGjsonb)

371− '["key" ::: 'NotNull 'PGtext, "value" ::: 'NotNull 'PGtext]

372−jsonbEachText = unsafeSetFunction

373−

374−{- | Returns set of keys in the outermost JSON object.

375−

376−>>> printSQL (jsonObjectKeys (literal (Json (object ["a" .= "foo", "b" .= "bar"]))))

377−json_object_keys(('{"a":"foo","b":"bar"}' :: json))

378−-}

379−jsonObjectKeys

380− :: SetFunction "json_object_keys" (nullity 'PGjson)

381− '["json_object_keys" ::: 'NotNull 'PGtext]

382−jsonObjectKeys = unsafeSetFunction

383−

384−{- | Returns set of keys in the outermost JSON object.

385−

386−>>> printSQL (jsonbObjectKeys (literal (Jsonb (object ["a" .= "foo", "b" .= "bar"]))))

387−jsonb_object_keys(('{"a":"foo","b":"bar"}' :: jsonb))

388−-}

389−jsonbObjectKeys

390− :: SetFunction "jsonb_object_keys" (null 'PGjsonb)

391− '["jsonb_object_keys" ::: 'NotNull 'PGtext]

392−jsonbObjectKeys = unsafeSetFunction

393−

394−-- | Build rows from Json types.

395−type JsonPopulateFunction fun json

396− = forall schemas row outer commons params

397− . json `In` PGJsonType

398− => TypeExpression schemas ('NotNull ('PGcomposite row)) -- ^ row type

399− -> Expression outer commons 'Ungrouped schemas params '[] ('NotNull json)

400− -- ^ json type

401− -> FromClause outer commons schemas params '[fun ::: row]

402−

403−unsafePopulateFunction

404− :: forall fun ty

405− . KnownSymbol fun => Alias fun -> JsonPopulateFunction fun ty

406−unsafePopulateFunction _fun ty expr = UnsafeFromClause $ renderSymbol @fun

407− <> parenthesized ("null::" <> renderSQL ty <> ", " <> renderSQL expr)

408−

409−-- | Expands the JSON expression to a row whose columns match the record

410−-- type defined by the given table.

411−jsonPopulateRecord :: JsonPopulateFunction "json_populate_record" 'PGjson

412−jsonPopulateRecord = unsafePopulateFunction #json_populate_record

413−

414−-- | Expands the binary JSON expression to a row whose columns match the record

415−-- type defined by the given table.

416−jsonbPopulateRecord :: JsonPopulateFunction "jsonb_populate_record" 'PGjsonb

417−jsonbPopulateRecord = unsafePopulateFunction #jsonb_populate_record

418−

419−-- | Expands the outermost array of objects in the given JSON expression to a

420−-- set of rows whose columns match the record type defined by the given table.

421−jsonPopulateRecordSet :: JsonPopulateFunction "json_populate_record_set" 'PGjson

422−jsonPopulateRecordSet = unsafePopulateFunction #json_populate_record_set

423−

424−-- | Expands the outermost array of objects in the given binary JSON expression

425−-- to a set of rows whose columns match the record type defined by the given

426−-- table.

427−jsonbPopulateRecordSet :: JsonPopulateFunction "jsonb_populate_record_set" 'PGjsonb

428−jsonbPopulateRecordSet = unsafePopulateFunction #jsonb_populate_record_set

429−

430−-- | Build rows from Json types.

431−type JsonToRecordFunction json

432− = forall outer commons schemas params tab row

433− . (SOP.SListI row, json `In` PGJsonType)

434− => Expression outer commons 'Ungrouped schemas params '[] ('NotNull json)

435− -- ^ json type

436− -> Aliased (NP (Aliased (TypeExpression schemas))) (tab ::: row)

437− -- ^ row type

438− -> FromClause outer commons schemas params '[tab ::: row]

439−

440−unsafeRecordFunction :: ByteString -> JsonToRecordFunction json

441−unsafeRecordFunction fun expr (types `As` tab) = UnsafeFromClause $

442− fun <> parenthesized (renderSQL expr) <+> "AS" <+> renderSQL tab

443− <> parenthesized (renderCommaSeparated renderTy types)

444− where

445− renderTy :: Aliased (TypeExpression schemas) ty -> ByteString

446− renderTy (ty `As` alias) = renderSQL alias <+> renderSQL ty

447−

448−-- | Builds an arbitrary record from a JSON object.

449−jsonToRecord :: JsonToRecordFunction 'PGjson

450−jsonToRecord = unsafeRecordFunction "json_to_record"

451−

452−-- | Builds an arbitrary record from a binary JSON object.

453−jsonbToRecord :: JsonToRecordFunction 'PGjsonb

454−jsonbToRecord = unsafeRecordFunction "jsonb_to_record"

455−

456−-- | Builds an arbitrary set of records from a JSON array of objects.

457−jsonToRecordSet :: JsonToRecordFunction 'PGjson

458−jsonToRecordSet = unsafeRecordFunction "json_to_record_set"

459−

460−-- | Builds an arbitrary set of records from a binary JSON array of objects.

461−jsonbToRecordSet :: JsonToRecordFunction 'PGjsonb

462−jsonbToRecordSet = unsafeRecordFunction "jsonb_to_record_set"

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Literal.hsdeleted−87

@@ -1,87 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Literal

3−Description: Literal expressions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Literal expressions

9−-}

10−

11−{-# LANGUAGE

12− FlexibleContexts

13− , FlexibleInstances

14− , LambdaCase

15− , OverloadedStrings

16− , RankNTypes

17− , ScopedTypeVariables

18− , TypeApplications

19− , TypeSynonymInstances

20− , UndecidableInstances

21−#-}

22−

23−module Squeal.PostgreSQL.Expression.Literal (Literal (..)) where

24−

25−import ByteString.StrictBuilder (builderBytes)

26−import Data.ByteString.Lazy (toStrict)

27−import Data.Int

28−import Data.String

29−import Data.Text (Text)

30−

31−import qualified Data.Aeson as JSON

32−import qualified Data.Text as Text

33−import qualified Data.Text.Lazy as Lazy (Text)

34−import qualified Data.Text.Lazy as Lazy.Text

35−

36−import Squeal.PostgreSQL.Binary

37−import Squeal.PostgreSQL.Expression

38−import Squeal.PostgreSQL.Expression.Logic

39−import Squeal.PostgreSQL.PG

40−import Squeal.PostgreSQL.Render

41−

42−{- |

43−The `Literal` class allows embedding a Haskell value directly

44−as an `Expression` using `literal`.

45−

46−>>> printSQL (literal 'a')

47−E'a'

48−

49−>>> printSQL (literal (1 :: Double))

50−1.0

51−

52−>>> printSQL (literal (Json [1 :: Double, 2]))

53−('[1.0,2.0]' :: json)

54−

55−>>> printSQL (literal (Enumerated GT))

56−'GT'

57−-}

58−class Literal hask where literal :: hask -> Expr (null (PG hask))

59−instance Literal Bool where

60− literal = \case

61− True -> true

62− False -> false

63−instance JSON.ToJSON hask => Literal (Json hask) where

64− literal = UnsafeExpression . parenthesized . (<> " :: json")

65− . singleQuotedUtf8 . toStrict . JSON.encode . getJson

66−instance JSON.ToJSON hask => Literal (Jsonb hask) where

67− literal = UnsafeExpression . parenthesized . (<> " :: jsonb")

68− . singleQuotedUtf8 . toStrict . JSON.encode . getJsonb

69−instance Literal Char where

70− literal chr = UnsafeExpression $

71− "E\'" <> fromString (escape chr) <> "\'"

72−instance Literal String where literal = fromString

73−instance Literal Int16 where literal = fromIntegral

74−instance Literal Int32 where literal = fromIntegral

75−instance Literal Int64 where literal = fromIntegral

76−instance Literal Float where literal = fromRational . toRational

77−instance Literal Double where literal = fromRational . toRational

78−instance Literal Text where literal = fromString . Text.unpack

79−instance Literal Lazy.Text where literal = fromString . Lazy.Text.unpack

80−instance ToParam (Enumerated enum) (PG (Enumerated enum))

81− => Literal (Enumerated enum) where

82− literal

83− = UnsafeExpression

84− . singleQuotedUtf8

85− . builderBytes

86− . unK

87− . toParam @(Enumerated enum) @(PG (Enumerated enum))

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Logic.hsdeleted−105

@@ -1,105 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Logic

3−Description: Logical expressions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Logical expressions and operators

9−-}

10−

11−{-# LANGUAGE

12− DataKinds

13− , OverloadedStrings

14− , TypeOperators

15−#-}

16−

17−module Squeal.PostgreSQL.Expression.Logic

18− ( Condition

19− , true

20− , false

21− , not_

22− , (.&&)

23− , (.||)

24− , caseWhenThenElse

25− , ifThenElse

26− ) where

27−

28−import Squeal.PostgreSQL.Expression

29−import Squeal.PostgreSQL.Render

30−import Squeal.PostgreSQL.Schema

31−

32−-- | A `Condition` is an `Expression`, which can evaluate

33−-- to `true`, `false` or `Squeal.PostgreSQL.Null.null_`. This is because SQL uses

34−-- a three valued logic.

35−type Condition outer commons grp schemas params from =

36− Expression outer commons grp schemas params from ('Null 'PGbool)

37−

38−-- | >>> printSQL true

39−-- TRUE

40−true :: Expr (null 'PGbool)

41−true = UnsafeExpression "TRUE"

42−

43−-- | >>> printSQL false

44−-- FALSE

45−false :: Expr (null 'PGbool)

46−false = UnsafeExpression "FALSE"

47−

48−-- | >>> printSQL $ not_ true

49−-- (NOT TRUE)

50−not_ :: null 'PGbool --> null 'PGbool

51−not_ = unsafeLeftOp "NOT"

52−

53−-- | >>> printSQL $ true .&& false

54−-- (TRUE AND FALSE)

55−(.&&) :: Operator (null 'PGbool) (null 'PGbool) (null 'PGbool)

56−infixr 3 .&&

57−(.&&) = unsafeBinaryOp "AND"

58−

59−-- | >>> printSQL $ true .|| false

60−-- (TRUE OR FALSE)

61−(.||) :: Operator (null 'PGbool) (null 'PGbool) (null 'PGbool)

62−infixr 2 .||

63−(.||) = unsafeBinaryOp "OR"

64−

65−-- | >>> :{

66−-- let

67−-- expression :: Expression outer commons grp schemas params from (null 'PGint2)

68−-- expression = caseWhenThenElse [(true, 1), (false, 2)] 3

69−-- in printSQL expression

70−-- :}

71−-- CASE WHEN TRUE THEN 1 WHEN FALSE THEN 2 ELSE 3 END

72−caseWhenThenElse

73− :: [ ( Condition outer commons grp schemas params from

74− , Expression outer commons grp schemas params from ty

75− ) ]

76− -- ^ whens and thens

77− -> Expression outer commons grp schemas params from ty

78− -- ^ else

79− -> Expression outer commons grp schemas params from ty

80−caseWhenThenElse whenThens else_ = UnsafeExpression $ mconcat

81− [ "CASE"

82− , mconcat

83− [ mconcat

84− [ " WHEN ", renderSQL when_

85− , " THEN ", renderSQL then_

86− ]

87− | (when_,then_) <- whenThens

88− ]

89− , " ELSE ", renderSQL else_

90− , " END"

91− ]

92−

93−-- | >>> :{

94−-- let

95−-- expression :: Expression outer commons grp schemas params from (null 'PGint2)

96−-- expression = ifThenElse true 1 0

97−-- in printSQL expression

98−-- :}

99−-- CASE WHEN TRUE THEN 1 ELSE 0 END

100−ifThenElse

101− :: Condition outer commons grp schemas params from

102− -> Expression outer commons grp schemas params from ty -- ^ then

103− -> Expression outer commons grp schemas params from ty -- ^ else

104− -> Expression outer commons grp schemas params from ty

105−ifThenElse if_ then_ else_ = caseWhenThenElse [(if_,then_)] else_

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Math.hsdeleted−100

@@ -1,100 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Math

3−Description: Math expressions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Mathematical functions and operators

9−-}

10−

11−{-# LANGUAGE

12− DataKinds

13− , OverloadedStrings

14− , TypeOperators

15−#-}

16−

17−module Squeal.PostgreSQL.Expression.Math

18− ( atan2_

19− , quot_

20− , rem_

21− , trunc

22− , round_

23− , ceiling_

24− ) where

25−

26−import Squeal.PostgreSQL.Expression

27−import Squeal.PostgreSQL.List

28−import Squeal.PostgreSQL.Schema

29−

30−-- $setup

31−-- >>> import Squeal.PostgreSQL

32−

33−-- | >>> :{

34−-- let

35−-- expression :: Expr (null 'PGfloat4)

36−-- expression = atan2_ (pi *: 2)

37−-- in printSQL expression

38−-- :}

39−-- atan2(pi(), 2)

40−atan2_ :: float `In` PGFloating => '[ null float, null float] ---> null float

41−atan2_ = unsafeFunctionN "atan2"

42−

43−

44−-- | integer division, truncates the result

45−--

46−-- >>> :{

47−-- let

48−-- expression :: Expression outer commons grp schemas params from (null 'PGint2)

49−-- expression = 5 `quot_` 2

50−-- in printSQL expression

51−-- :}

52−-- (5 / 2)

53−quot_

54− :: int `In` PGIntegral

55− => Operator (null int) (null int) (null int)

56−quot_ = unsafeBinaryOp "/"

57−

58−-- | remainder upon integer division

59−--

60−-- >>> :{

61−-- let

62−-- expression :: Expression outer commons grp schemas params from (null 'PGint2)

63−-- expression = 5 `rem_` 2

64−-- in printSQL expression

65−-- :}

66−-- (5 % 2)

67−rem_

68− :: int `In` PGIntegral

69− => Operator (null int) (null int) (null int)

70−rem_ = unsafeBinaryOp "%"

71−

72−-- | >>> :{

73−-- let

74−-- expression :: Expression outer commons grp schemas params from (null 'PGfloat4)

75−-- expression = trunc pi

76−-- in printSQL expression

77−-- :}

78−-- trunc(pi())

79−trunc :: frac `In` PGFloating => null frac --> null frac

80−trunc = unsafeFunction "trunc"

81−

82−-- | >>> :{

83−-- let

84−-- expression :: Expression outer commons grp schemas params from (null 'PGfloat4)

85−-- expression = round_ pi

86−-- in printSQL expression

87−-- :}

88−-- round(pi())

89−round_ :: frac `In` PGFloating => null frac --> null frac

90−round_ = unsafeFunction "round"

91−

92−-- | >>> :{

93−-- let

94−-- expression :: Expression outer commons grp schemas params from (null 'PGfloat4)

95−-- expression = ceiling_ pi

96−-- in printSQL expression

97−-- :}

98−-- ceiling(pi())

99−ceiling_ :: frac `In` PGFloating => null frac --> null frac

100−ceiling_ = unsafeFunction "ceiling"

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Null.hsdeleted−104

@@ -1,104 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Null

3−Description: Null

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Null values and null handling functions

9−-}

10−

11−{-# LANGUAGE

12− DataKinds

13− , OverloadedStrings

14− , TypeOperators

15−#-}

16−

17−module Squeal.PostgreSQL.Expression.Null

18− ( null_

19− , notNull

20− , coalesce

21− , fromNull

22− , isNull

23− , isNotNull

24− , matchNull

25− , nullIf

26− ) where

27−

28−import Squeal.PostgreSQL.Expression

29−import Squeal.PostgreSQL.Expression.Logic

30−import Squeal.PostgreSQL.Render

31−import Squeal.PostgreSQL.Schema

32−

33−-- $setup

34−-- >>> import Squeal.PostgreSQL

35−

36−-- | analagous to `Nothing`

37−--

38−-- >>> printSQL null_

39−-- NULL

40−null_ :: Expr ('Null ty)

41−null_ = UnsafeExpression "NULL"

42−

43−-- | analagous to `Just`

44−--

45−-- >>> printSQL $ notNull true

46−-- TRUE

47−notNull :: 'NotNull ty --> 'Null ty

48−notNull = UnsafeExpression . renderSQL

49−

50−-- | return the leftmost value which is not NULL

51−--

52−-- >>> printSQL $ coalesce [null_, true] false

53−-- COALESCE(NULL, TRUE, FALSE)

54−coalesce :: FunctionVar ('Null ty) ('NotNull ty) ('NotNull ty)

55−coalesce nullxs notNullx = UnsafeExpression $

56− "COALESCE" <> parenthesized (commaSeparated

57− ((renderSQL <$> nullxs) <> [renderSQL notNullx]))

58−

59−-- | analagous to `Data.Maybe.fromMaybe` using @COALESCE@

60−--

61−-- >>> printSQL $ fromNull true null_

62−-- COALESCE(NULL, TRUE)

63−fromNull

64− :: Expression outer commons grp schemas params from ('NotNull ty)

65− -- ^ what to convert @NULL@ to

66− -> Expression outer commons grp schemas params from ('Null ty)

67− -> Expression outer commons grp schemas params from ('NotNull ty)

68−fromNull notNullx nullx = coalesce [nullx] notNullx

69−

70−-- | >>> printSQL $ null_ & isNull

71−-- NULL IS NULL

72−isNull :: 'Null ty --> null 'PGbool

73−isNull x = UnsafeExpression $ renderSQL x <+> "IS NULL"

74−

75−-- | >>> printSQL $ null_ & isNotNull

76−-- NULL IS NOT NULL

77−isNotNull :: 'Null ty --> null 'PGbool

78−isNotNull x = UnsafeExpression $ renderSQL x <+> "IS NOT NULL"

79−

80−-- | analagous to `maybe` using @IS NULL@

81−--

82−-- >>> printSQL $ matchNull true not_ null_

83−-- CASE WHEN NULL IS NULL THEN TRUE ELSE (NOT NULL) END

84−matchNull

85− :: Expression outer commons grp schemas params from (nullty)

86− -- ^ what to convert @NULL@ to

87− -> ( Expression outer commons grp schemas params from ('NotNull ty)

88− -> Expression outer commons grp schemas params from (nullty) )

89− -- ^ function to perform when @NULL@ is absent

90− -> Expression outer commons grp schemas params from ('Null ty)

91− -> Expression outer commons grp schemas params from (nullty)

92−matchNull y f x = ifThenElse (isNull x) y

93− (f (UnsafeExpression (renderSQL x)))

94−

95−{-| right inverse to `fromNull`, if its arguments are equal then

96−`nullIf` gives @NULL@.

97−

98−>>> :set -XTypeApplications -XDataKinds

99−>>> let expr = nullIf (false *: param @1) :: Expression outer commons grp schemas '[ 'NotNull 'PGbool] from ('Null 'PGbool)

100−>>> printSQL expr

101−NULLIF(FALSE, ($1 :: bool))

102−-}

103−nullIf :: '[ 'NotNull ty, 'NotNull ty] ---> 'Null ty

104−nullIf = unsafeFunctionN "NULLIF"

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Parameter.hsdeleted−80

@@ -1,80 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Parameter

3−Description: Parameters

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Parameters, out-of-line data values

9−-}

10−

11−{-# LANGUAGE

12− AllowAmbiguousTypes

13− , DataKinds

14− , FlexibleContexts

15− , FlexibleInstances

16− , FunctionalDependencies

17− , KindSignatures

18− , MultiParamTypeClasses

19− , OverloadedStrings

20− , RankNTypes

21− , ScopedTypeVariables

22− , TypeApplications

23− , TypeOperators

24− , UndecidableInstances

25−#-}

26−

27−module Squeal.PostgreSQL.Expression.Parameter

28− ( HasParameter (parameter)

29− , param

30− ) where

31−

32−import GHC.TypeLits

33−

34−import Squeal.PostgreSQL.Expression

35−import Squeal.PostgreSQL.Expression.Type

36−import Squeal.PostgreSQL.Render

37−import Squeal.PostgreSQL.Schema

38−

39−-- $setup

40−-- >>> import Squeal.PostgreSQL

41−

42−{- | A `HasParameter` constraint is used to indicate a value that is

43−supplied externally to a SQL statement.

44−`Squeal.PostgreSQL.PQ.manipulateParams`,

45−`Squeal.PostgreSQL.PQ.queryParams` and

46−`Squeal.PostgreSQL.PQ.traversePrepared` support specifying data values

47−separately from the SQL command string, in which case `param`s are used to

48−refer to the out-of-line data values.

49−-}

50−class KnownNat n => HasParameter

51− (n :: Nat)

52− (params :: [NullityType])

53− (ty :: NullityType)

54− | n params -> ty where

55− -- | `parameter` takes a `Nat` using type application and a `TypeExpression`.

56− --

57− -- >>> let expr = parameter @1 int4 :: Expression outer '[] grp schemas '[ 'Null 'PGint4] from ('Null 'PGint4)

58− -- >>> printSQL expr

59− -- ($1 :: int4)

60− parameter

61− :: TypeExpression schemas ty

62− -> Expression outer commons grp schemas params from ty

63− parameter ty = UnsafeExpression $ parenthesized $

64− "$" <> renderNat @n <+> "::"

65− <+> renderSQL ty

66−instance {-# OVERLAPPING #-} HasParameter 1 (ty1:tys) ty1

67−instance {-# OVERLAPPABLE #-} (KnownNat n, HasParameter (n-1) params ty)

68− => HasParameter n (ty' : params) ty

69−

70−-- | `param` takes a `Nat` using type application and for basic types,

71−-- infers a `TypeExpression`.

72−--

73−-- >>> let expr = param @1 :: Expression outer commons grp schemas '[ 'Null 'PGint4] from ('Null 'PGint4)

74−-- >>> printSQL expr

75−-- ($1 :: int4)

76−param

77− :: forall n outer commons schemas params from grp ty

78− . (PGTyped schemas ty, HasParameter n params ty)

79− => Expression outer commons grp schemas params from ty -- ^ param

80−param = parameter @n (pgtype @schemas)

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Range.hsdeleted−230

@@ -1,230 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Range

3−Description: range types and functions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Range types and functions

9−-}

10−

11−{-# LANGUAGE

12− AllowAmbiguousTypes

13− , DataKinds

14− , DeriveAnyClass

15− , DeriveGeneric

16− , DeriveFoldable

17− , DerivingStrategies

18− , DeriveTraversable

19− , FlexibleContexts

20− , FlexibleInstances

21− , LambdaCase

22− , MultiParamTypeClasses

23− , OverloadedLabels

24− , OverloadedStrings

25− , PatternSynonyms

26− , RankNTypes

27− , ScopedTypeVariables

28− , TypeApplications

29− , TypeFamilies

30− , TypeOperators

31− , UndecidableInstances

32−#-}

33−

34−module Squeal.PostgreSQL.Expression.Range

35− ( range

36− , Range (..)

37− , (<=..<=), (<..<), (<=..<), (<..<=)

38− , moreThan, atLeast, lessThan, atMost

39− , singleton, whole

40− , Bound (..)

41− , (.<@)

42− , (@>.)

43− , (<<@)

44− , (@>>)

45− , (&<)

46− , (&>)

47− , (-|-)

48− , (@+)

49− , (@*)

50− , (@-)

51− , lowerBound

52− , upperBound

53− , isEmpty

54− , lowerInc

55− , lowerInf

56− , upperInc

57− , upperInf

58− , rangeMerge

59− ) where

60−

61−import BinaryParser

62−import ByteString.StrictBuilder

63−import Data.Bits

64−import qualified GHC.Generics as GHC

65−import qualified Generics.SOP as SOP

66−import qualified PostgreSQL.Binary.Decoding as Decoding

67−

68−import Squeal.PostgreSQL.Binary

69−import Squeal.PostgreSQL.Expression

70−import Squeal.PostgreSQL.Expression.Type hiding (bool)

71−import Squeal.PostgreSQL.PG

72−import Squeal.PostgreSQL.Render

73−import Squeal.PostgreSQL.Schema

74−

75−-- $setup

76−-- >>> import Squeal.PostgreSQL

77−

78−-- | Construct a `range`

79−--

80−-- >>> printSQL $ range tstzrange (atLeast now)

81−-- tstzrange(now(), NULL, '[)')

82−-- >>> printSQL $ range numrange (0 <=..< 2*pi)

83−-- numrange(0, (2 * pi()), '[)')

84−-- >>> printSQL $ range int4range Empty

85−-- ('empty' :: int4range)

86−range

87− :: TypeExpression schemas (null ('PGrange ty))

88− -> Range (Expression outer commons grp schemas params from ('NotNull ty))

89− -> Expression outer commons grp schemas params from (null ('PGrange ty))

90−range ty = \case

91− Empty -> UnsafeExpression $ parenthesized

92− (emp <+> "::" <+> renderSQL ty)

93− NonEmpty l u -> UnsafeExpression $ renderSQL ty <> parenthesized

94− (commaSeparated (args l u))

95− where

96− emp = singleQuote <> "empty" <> singleQuote

97− args l u = [arg l, arg u, singleQuote <> bra l <> ket u <> singleQuote]

98− singleQuote = "\'"

99− arg = \case

100− Infinite -> "NULL"; Closed x -> renderSQL x; Open x -> renderSQL x

101− bra = \case Infinite -> "("; Closed _ -> "["; Open _ -> "("

102− ket = \case Infinite -> ")"; Closed _ -> "]"; Open _ -> ")"

103−

104−data Bound x = Infinite | Closed x | Open x

105− deriving

106− ( Eq, Ord, Show, Read, GHC.Generic

107− , Functor, Foldable, Traversable )

108−

109−data Range x = Empty | NonEmpty (Bound x) (Bound x)

110− deriving

111− ( Eq, Ord, Show, Read, GHC.Generic

112− , Functor, Foldable, Traversable )

113− deriving anyclass (SOP.Generic, SOP.HasDatatypeInfo)

114−type instance PG (Range x) = 'PGrange (PG x)

115−instance ToParam x pg => ToParam (Range x) ('PGrange pg) where

116− toParam rng = K $

117− word8 (setFlags rng 0) <>

118− case rng of

119− Empty -> mempty

120− NonEmpty lower upper -> putBound lower <> putBound upper

121− where

122− putBound = \case

123− Infinite -> mempty

124− Closed value -> putValue (unK (toParam @x @pg value))

125− Open value -> putValue (unK (toParam @x @pg value))

126− putValue value = int32BE (fromIntegral (builderLength value)) <> value

127− setFlags = \case

128− Empty -> (`setBit` 0)

129− NonEmpty lower upper ->

130− setLowerFlags lower . setUpperFlags upper

131− setLowerFlags = \case

132− Infinite -> (`setBit` 3)

133− Closed _ -> (`setBit` 1)

134− Open _ -> id

135− setUpperFlags = \case

136− Infinite -> (`setBit` 4)

137− Closed _ -> (`setBit` 2)

138− Open _ -> id

139−instance FromValue pg y => FromValue ('PGrange pg) (Range y) where

140− fromValue = do

141− flag <- byte

142− if testBit flag 0 then return Empty else do

143− lower <-

144− if testBit flag 3

145− then return Infinite

146− else do

147− len <- sized 4 Decoding.int

148− l <- sized len (fromValue @pg)

149− return $ if testBit flag 1 then Closed l else Open l

150− upper <-

151− if testBit flag 4

152− then return Infinite

153− else do

154− len <- sized 4 Decoding.int

155− l <- sized len (fromValue @pg)

156− return $ if testBit flag 2 then Closed l else Open l

157− return $ NonEmpty lower upper

158−

159−(<=..<=), (<..<), (<=..<), (<..<=) :: x -> x -> Range x

160−infix 4 <=..<=, <..<, <=..<, <..<=

161−x <=..<= y = NonEmpty (Closed x) (Closed y)

162−x <..< y = NonEmpty (Open x) (Open y)

163−x <=..< y = NonEmpty (Closed x) (Open y)

164−x <..<= y = NonEmpty (Open x) (Closed y)

165−

166−moreThan, atLeast, lessThan, atMost :: x -> Range x

167−moreThan x = NonEmpty (Open x) Infinite

168−atLeast x = NonEmpty (Closed x) Infinite

169−lessThan x = NonEmpty Infinite (Open x)

170−atMost x = NonEmpty Infinite (Closed x)

171−

172−singleton :: x -> Range x

173−singleton x = x <=..<= x

174−

175−whole :: Range x

176−whole = NonEmpty Infinite Infinite

177−

178−(.<@) :: Operator ('NotNull ty) (null ('PGrange ty)) ('Null 'PGbool)

179−(.<@) = unsafeBinaryOp "<@"

180−

181−(@>.) :: Operator (null ('PGrange ty)) ('NotNull ty) ('Null 'PGbool)

182−(@>.) = unsafeBinaryOp "<@"

183−

184−(<<@) :: Operator (null ('PGrange ty)) (null ('PGrange ty)) ('Null 'PGbool)

185−(<<@) = unsafeBinaryOp "<<"

186−

187−(@>>) :: Operator (null ('PGrange ty)) (null ('PGrange ty)) ('Null 'PGbool)

188−(@>>) = unsafeBinaryOp ">>"

189−

190−(&<) :: Operator (null ('PGrange ty)) (null ('PGrange ty)) ('Null 'PGbool)

191−(&<) = unsafeBinaryOp "&<"

192−

193−(&>) :: Operator (null ('PGrange ty)) (null ('PGrange ty)) ('Null 'PGbool)

194−(&>) = unsafeBinaryOp "&>"

195−

196−(-|-) :: Operator (null ('PGrange ty)) (null ('PGrange ty)) ('Null 'PGbool)

197−(-|-) = unsafeBinaryOp "-|-"

198−

199−(@+) :: Operator (null ('PGrange ty)) (null ('PGrange ty)) (null ('PGrange ty))

200−(@+) = unsafeBinaryOp "+"

201−

202−(@*) :: Operator (null ('PGrange ty)) (null ('PGrange ty)) (null ('PGrange ty))

203−(@*) = unsafeBinaryOp "*"

204−

205−(@-) :: Operator (null ('PGrange ty)) (null ('PGrange ty)) (null ('PGrange ty))

206−(@-) = unsafeBinaryOp "-"

207−

208−lowerBound :: null ('PGrange ty) --> 'Null ty

209−lowerBound = unsafeFunction "lower"

210−

211−upperBound :: null ('PGrange ty) --> 'Null ty

212−upperBound = unsafeFunction "upper"

213−

214−isEmpty :: null ('PGrange ty) --> 'Null 'PGbool

215−isEmpty = unsafeFunction "isempty"

216−

217−lowerInc :: null ('PGrange ty) --> 'Null 'PGbool

218−lowerInc = unsafeFunction "lower_inc"

219−

220−lowerInf :: null ('PGrange ty) --> 'Null 'PGbool

221−lowerInf = unsafeFunction "lower_inf"

222−

223−upperInc :: null ('PGrange ty) --> 'Null 'PGbool

224−upperInc = unsafeFunction "upper_inc"

225−

226−upperInf :: null ('PGrange ty) --> 'Null 'PGbool

227−upperInf = unsafeFunction "upper_inf"

228−

229−rangeMerge :: '[null ('PGrange ty), null ('PGrange ty)] ---> null ('PGrange ty)

230−rangeMerge = unsafeFunctionN "range_merge"

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Set.hsdeleted−139

@@ -1,139 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Set

3−Description: Set returning functions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Set returning functions

9−-}

10−

11−{-# LANGUAGE

12− AllowAmbiguousTypes

13− , DataKinds

14− , FlexibleContexts

15− , OverloadedStrings

16− , PolyKinds

17− , RankNTypes

18− , ScopedTypeVariables

19− , TypeApplications

20− , TypeOperators

21−#-}

22−

23−module Squeal.PostgreSQL.Expression.Set

24− ( generateSeries

25− , generateSeriesStep

26− , generateSeriesTimestamp

27− , SetFunction

28− , unsafeSetFunction

29− , SetFunctionDB

30− , setFunction

31− , SetFunctionN

32− , unsafeSetFunctionN

33− , SetFunctionNDB

34− , setFunctionN

35− ) where

36−

37−import GHC.TypeLits

38−

39−import qualified Generics.SOP as SOP

40−

41−import Squeal.PostgreSQL.Alias

42−import Squeal.PostgreSQL.Expression

43−import Squeal.PostgreSQL.List

44−import Squeal.PostgreSQL.Render

45−import Squeal.PostgreSQL.Query

46−import Squeal.PostgreSQL.Schema

47−

48−{- |

49−A @RankNType@ for set returning functions with 1 argument.

50−-}

51−type SetFunction fun ty row

52− = forall outer commons schemas params

53− . Expression outer commons 'Ungrouped schemas params '[] ty

54− -- ^ input

55− -> FromClause outer commons schemas params '[fun ::: row]

56− -- ^ output

57−

58−type SetFunctionDB fun schemas ty row

59− = forall outer commons params

60− . Expression outer commons 'Ungrouped schemas params '[] ty

61− -- ^ input

62− -> FromClause outer commons schemas params '[fun ::: row]

63− -- ^ output

64−

65−-- | Escape hatch for a set returning function with 1 argument.

66−unsafeSetFunction

67− :: forall fun ty row. KnownSymbol fun

68− => SetFunction fun ty row -- ^ set returning function

69−unsafeSetFunction x = UnsafeFromClause $

70− renderSymbol @fun <> parenthesized (renderSQL x)

71−

72−setFunction

73− :: ( Has sch schemas schema

74− , Has fun schema ('Function ('[ty] :=> 'ReturnsTable row)) )

75− => QualifiedAlias sch fun

76− -> SetFunctionDB fun schemas ty row

77−setFunction _ = unsafeSetFunction

78−

79−{- |

80−A @RankNType@ for set returning functions with multiple argument.

81−-}

82−type SetFunctionN fun tys row

83− = forall outer commons schemas params

84− . NP (Expression outer commons 'Ungrouped schemas params '[]) tys

85− -- ^ inputs

86− -> FromClause outer commons schemas params '[fun ::: row]

87− -- ^ output

88−

89−-- | Escape hatch for a set returning function with multiple argument.

90−unsafeSetFunctionN

91− :: forall fun tys row. (SOP.SListI tys, KnownSymbol fun)

92− => SetFunctionN fun tys row -- ^ set returning function

93−unsafeSetFunctionN xs = UnsafeFromClause $

94− renderSymbol @fun <> parenthesized (renderCommaSeparated renderSQL xs)

95−

96−type SetFunctionNDB fun schemas tys row

97− = forall outer commons params

98− . NP (Expression outer commons 'Ungrouped schemas params '[]) tys

99− -- ^ inputs

100− -> FromClause outer commons schemas params '[fun ::: row]

101− -- ^ output

102−

103−setFunctionN

104− :: ( Has sch schemas schema

105− , Has fun schema ('Function (tys :=> 'ReturnsTable row))

106− , SOP.SListI tys )

107− => QualifiedAlias sch fun

108− -> SetFunctionNDB fun schemas tys row

109−setFunctionN _ = unsafeSetFunctionN

110−

111−{- | @generateSeries (start *: stop)@

112−

113−Generate a series of values, from @start@ to @stop@ with a step size of one

114−-}

115−generateSeries

116− :: ty `In` '[ 'PGint4, 'PGint8, 'PGnumeric]

117− => SetFunctionN "generate_series" '[ null ty, null ty]

118− '["generate_series" ::: null ty] -- ^ set returning function

119−generateSeries = unsafeSetFunctionN

120−

121−{- | @generateSeries (start :* stop *: step)@

122−

123−Generate a series of values, from @start@ to @stop@ with a step size of @step@

124−-}

125−generateSeriesStep

126− :: ty `In` '[ 'PGint4, 'PGint8, 'PGnumeric]

127− => SetFunctionN "generate_series" '[null ty, null ty, null ty]

128− '["generate_series" ::: null ty] -- ^ set returning function

129−generateSeriesStep = unsafeSetFunctionN

130−

131−{- | @generateSeries (start :* stop *: step)@

132−

133−Generate a series of values, from @start@ to @stop@ with a step size of @step@

134−-}

135−generateSeriesTimestamp

136− :: ty `In` '[ 'PGtimestamp, 'PGtimestamptz]

137− => SetFunctionN "generate_series" '[null ty, null ty, null 'PGinterval]

138− '["generate_series" ::: null ty] -- ^ set returning function

139−generateSeriesTimestamp = unsafeSetFunctionN

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Sort.hsdeleted−85

@@ -1,85 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Sort

3−Description: Sort expressions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Sort expressions

9−-}

10−

11−{-# LANGUAGE

12− DataKinds

13− , GADTs

14− , LambdaCase

15− , OverloadedStrings

16− , StandaloneDeriving

17−#-}

18−

19−module Squeal.PostgreSQL.Expression.Sort

20− ( SortExpression (..)

21− , OrderBy (..)

22− ) where

23−

24−import Squeal.PostgreSQL.Expression

25−import Squeal.PostgreSQL.Render

26−import Squeal.PostgreSQL.Schema

27−

28−-- | `SortExpression`s are used by `orderBy` to optionally sort the results

29−-- of a `Squeal.PostgreSQL.Query.Query`. `Asc` or `Desc`

30−-- set the sort direction of a `NotNull` result

31−-- column to ascending or descending. Ascending order puts smaller values

32−-- first, where "smaller" is defined in terms of the

33−-- `Squeal.PostgreSQL.Expression.Comparison..<` operator. Similarly,

34−-- descending order is determined with the

35−-- `Squeal.PostgreSQL.Expression.Comparison..>` operator. `AscNullsFirst`,

36−-- `AscNullsLast`, `DescNullsFirst` and `DescNullsLast` options are used to

37−-- determine whether nulls appear before or after non-null values in the sort

38−-- ordering of a `Null` result column.

39−data SortExpression outer commons grp schemas params from where

40− Asc

41− :: Expression outer commons grp schemas params from ('NotNull ty)

42− -> SortExpression outer commons grp schemas params from

43− Desc

44− :: Expression outer commons grp schemas params from ('NotNull ty)

45− -> SortExpression outer commons grp schemas params from

46− AscNullsFirst

47− :: Expression outer commons grp schemas params from ('Null ty)

48− -> SortExpression outer commons grp schemas params from

49− AscNullsLast

50− :: Expression outer commons grp schemas params from ('Null ty)

51− -> SortExpression outer commons grp schemas params from

52− DescNullsFirst

53− :: Expression outer commons grp schemas params from ('Null ty)

54− -> SortExpression outer commons grp schemas params from

55− DescNullsLast

56− :: Expression outer commons grp schemas params from ('Null ty)

57− -> SortExpression outer commons grp schemas params from

58−deriving instance Show (SortExpression outer commons grp schemas params from)

59−instance RenderSQL (SortExpression outer commons grp schemas params from) where

60− renderSQL = \case

61− Asc expression -> renderSQL expression <+> "ASC"

62− Desc expression -> renderSQL expression <+> "DESC"

63− AscNullsFirst expression -> renderSQL expression

64− <+> "ASC NULLS FIRST"

65− DescNullsFirst expression -> renderSQL expression

66− <+> "DESC NULLS FIRST"

67− AscNullsLast expression -> renderSQL expression <+> "ASC NULLS LAST"

68− DescNullsLast expression -> renderSQL expression <+> "DESC NULLS LAST"

69−

70−{- |

71−The `orderBy` clause causes the result rows of a `Squeal.PostgreSQL.Query.TableExpression`

72−to be sorted according to the specified `SortExpression`(s).

73−If two rows are equal according to the leftmost expression,

74−they are compared according to the next expression and so on.

75−If they are equal according to all specified expressions,

76−they are returned in an implementation-dependent order.

77−

78−You can also control the order in which rows are processed by window functions

79−using `orderBy` within `Squeal.PostgreSQL.Query.Over`.

80−-}

81−class OrderBy expr where

82− orderBy

83− :: [SortExpression outer commons grp schemas params from]

84− -> expr outer commons grp schemas params from

85− -> expr outer commons grp schemas params from

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Subquery.hsdeleted−120

@@ -1,120 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Subquery

3−Description: Subquery expressions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Subquery expressions

9−-}

10−

11−{-# LANGUAGE

12− DataKinds

13− , OverloadedStrings

14− , RankNTypes

15− , TypeOperators

16−#-}

17−

18−module Squeal.PostgreSQL.Expression.Subquery

19− ( exists

20− , in_

21− , notIn

22− , subAll

23− , subAny

24− ) where

25−

26−import Squeal.PostgreSQL.Alias

27−import Squeal.PostgreSQL.Expression

28−import Squeal.PostgreSQL.Expression.Logic

29−import Squeal.PostgreSQL.List

30−import Squeal.PostgreSQL.Query

31−import Squeal.PostgreSQL.Render

32−import Squeal.PostgreSQL.Schema

33−

34−-- $setup

35−-- >>> import Squeal.PostgreSQL

36−

37−{- |

38−The argument of `exists` is an arbitrary subquery. The subquery is evaluated

39−to determine whether it returns any rows. If it returns at least one row,

40−the result of `exists` is `true`; if the subquery returns no rows,

41−the result of `exists` is `false`.

42−

43−The subquery can refer to variables from the surrounding query,

44−which will act as constants during any one evaluation of the subquery.

45−

46−The subquery will generally only be executed long enough to determine whether

47−at least one row is returned, not all the way to completion.

48−-}

49−exists

50− :: Query (Join outer from) commons schemas params row

51− -> Condition outer commons grp schemas params from

52−exists query = UnsafeExpression $ "EXISTS" <+> parenthesized (renderSQL query)

53−

54−{- |

55−The right-hand side is a parenthesized subquery, which must return

56−exactly one column. The left-hand expression is evaluated and compared to each

57−row of the subquery result using the given `Operator`,

58−which must yield a Boolean result. The result of `subAll` is `true`

59−if all rows yield true (including the case where the subquery returns no rows).

60−The result is `false` if any `false` result is found.

61−The result is `Squeal.PostgreSQL.Expression.Null.null_` if

62− no comparison with a subquery row returns `false`,

63−and at least one comparison returns `Squeal.PostgreSQL.Expression.Null.null_`.

64−

65−>>> printSQL $ subAll true (.==) (values_ (true `as` #foo))

66−(TRUE = ALL (SELECT * FROM (VALUES (TRUE)) AS t ("foo")))

67−-}

68−subAll

69− :: Expression outer commons grp schemas params from ty1 -- ^ expression

70− -> Operator ty1 ty2 ('Null 'PGbool) -- ^ operator

71− -> Query (Join outer from) commons schemas params '[col ::: ty2] -- ^ subquery

72− -> Condition outer commons grp schemas params from

73−subAll expr (?) qry = expr ?

74− (UnsafeExpression $ "ALL" <+> parenthesized (renderSQL qry))

75−

76−{- |

77−The right-hand side is a parenthesized subquery, which must return exactly one column.

78−The left-hand expression is evaluated and compared to each row of the subquery result

79−using the given `Operator`, which must yield a Boolean result. The result of `subAny` is `true`

80−if any `true` result is obtained. The result is `false` if no true result is found

81−(including the case where the subquery returns no rows).

82−

83−>>> printSQL $ subAny "foo" like (values_ ("foobar" `as` #foo))

84−(E'foo' LIKE ANY (SELECT * FROM (VALUES (E'foobar')) AS t ("foo")))

85−-}

86−subAny

87− :: Expression outer commons grp schemas params from ty1 -- ^ expression

88− -> Operator ty1 ty2 ('Null 'PGbool) -- ^ operator

89− -> Query (Join outer from) commons schemas params '[col ::: ty2] -- ^ subquery

90− -> Condition outer commons grp schemas params from

91−subAny expr (?) qry = expr ?

92− (UnsafeExpression $ "ANY" <+> parenthesized (renderSQL qry))

93−

94−{- |

95−The result is `true` if the left-hand expression's result is equal

96−to any of the right-hand expressions.

97−

98−>>> printSQL $ true `in_` [true, false, null_]

99−TRUE IN (TRUE, FALSE, NULL)

100−-}

101−in_

102− :: Expression outer commons grp schemas params from ty -- ^ expression

103− -> [Expression outer commons grp schemas params from ty]

104− -> Condition outer commons grp schemas params from

105−expr `in_` exprs = UnsafeExpression $ renderSQL expr <+> "IN"

106− <+> parenthesized (commaSeparated (renderSQL <$> exprs))

107−

108−{- |

109−The result is `true` if the left-hand expression's result is not equal

110−to any of the right-hand expressions.

111−

112−>>> printSQL $ true `notIn` [false, null_]

113−TRUE NOT IN (FALSE, NULL)

114−-}

115−notIn

116− :: Expression outer commons grp schemas params from ty -- ^ expression

117− -> [Expression outer commons grp schemas params from ty]

118− -> Condition outer commons grp schemas params from

119−expr `notIn` exprs = UnsafeExpression $ renderSQL expr <+> "NOT IN"

120− <+> parenthesized (commaSeparated (renderSQL <$> exprs))

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Text.hsdeleted−64

@@ -1,64 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Text

3−Description: Text expressions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−String functions and operators

9−-}

10−

11−{-# LANGUAGE

12− DataKinds

13− , OverloadedStrings

14− , TypeOperators

15−#-}

16−

17−module Squeal.PostgreSQL.Expression.Text

18− ( lower

19− , upper

20− , charLength

21− , like

22− , ilike

23− ) where

24−

25−import Squeal.PostgreSQL.Expression

26−import Squeal.PostgreSQL.Schema

27−

28−-- $setup

29−-- >>> import Squeal.PostgreSQL

30−

31−-- | >>> printSQL $ lower "ARRRGGG"

32−-- lower(E'ARRRGGG')

33−lower :: null 'PGtext --> null 'PGtext

34−lower = unsafeFunction "lower"

35−

36−-- | >>> printSQL $ upper "eeee"

37−-- upper(E'eeee')

38−upper :: null 'PGtext --> null 'PGtext

39−upper = unsafeFunction "upper"

40−

41−-- | >>> printSQL $ charLength "four"

42−-- char_length(E'four')

43−charLength :: null 'PGtext --> null 'PGint4

44−charLength = unsafeFunction "char_length"

45−

46−-- | The `like` expression returns true if the @string@ matches

47−-- the supplied @pattern@. If @pattern@ does not contain percent signs

48−-- or underscores, then the pattern only represents the string itself;

49−-- in that case `like` acts like the equals operator. An underscore (_)

50−-- in pattern stands for (matches) any single character; a percent sign (%)

51−-- matches any sequence of zero or more characters.

52−--

53−-- >>> printSQL $ "abc" `like` "a%"

54−-- (E'abc' LIKE E'a%')

55−like :: Operator (null 'PGtext) (null 'PGtext) ('Null 'PGbool)

56−like = unsafeBinaryOp "LIKE"

57−

58−-- | The key word ILIKE can be used instead of LIKE to make the

59−-- match case-insensitive according to the active locale.

60−--

61−-- >>> printSQL $ "abc" `ilike` "a%"

62−-- (E'abc' ILIKE E'a%')

63−ilike :: Operator (null 'PGtext) (null 'PGtext) ('Null 'PGbool)

64−ilike = unsafeBinaryOp "ILIKE"

squeal-postgresql/src/Squeal/PostgreSQL/Expression/TextSearch.hsdeleted−157

@@ -1,157 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.TextSearch

3−Description: Text search expressions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Text search functions and operators

9−-}

10−

11−{-# LANGUAGE

12− DataKinds

13− , OverloadedStrings

14− , TypeOperators

15−#-}

16−

17−module Squeal.PostgreSQL.Expression.TextSearch

18− ( (@@)

19− , (.&)

20− , (.|)

21− , (.!)

22− , (<->)

23− , arrayToTSvector

24− , tsvectorLength

25− , numnode

26− , plainToTSquery

27− , phraseToTSquery

28− , websearchToTSquery

29− , queryTree

30− , toTSquery

31− , toTSvector

32− , setWeight

33− , strip

34− , jsonToTSvector

35− , jsonbToTSvector

36− , tsDelete

37− , tsFilter

38− , tsHeadline

39− ) where

40−

41−import Squeal.PostgreSQL.Expression

42−import Squeal.PostgreSQL.List

43−import Squeal.PostgreSQL.Schema

44−

45−-- | `Squeal.PostgreSQL.Expression.Type.tsvector` matches tsquery ?

46−(@@) :: Operator (null 'PGtsvector) (null 'PGtsquery) ('Null 'PGbool)

47−(@@) = unsafeBinaryOp "@@"

48−

49−-- | AND `Squeal.PostgreSQL.Expression.Type.tsquery`s together

50−(.&) :: Operator (null 'PGtsquery) (null 'PGtsquery) (null 'PGtsquery)

51−(.&) = unsafeBinaryOp "&&"

52−

53−-- | OR `Squeal.PostgreSQL.Expression.Type.tsquery`s together

54−(.|) :: Operator (null 'PGtsquery) (null 'PGtsquery) (null 'PGtsquery)

55−(.|) = unsafeBinaryOp "||"

56−

57−-- | negate a `Squeal.PostgreSQL.Expression.Type.tsquery`

58−(.!) :: null 'PGtsquery --> null 'PGtsquery

59−(.!) = unsafeLeftOp "!!"

60−

61−-- | `Squeal.PostgreSQL.Expression.Type.tsquery` followed by

62−-- `Squeal.PostgreSQL.Expression.Type.tsquery`

63−(<->) :: Operator (null 'PGtsquery) (null 'PGtsquery) (null 'PGtsquery)

64−(<->) = unsafeBinaryOp "<->"

65−

66−-- | convert array of lexemes to `Squeal.PostgreSQL.Expression.Type.tsvector`

67−arrayToTSvector

68− :: null ('PGvararray ('NotNull 'PGtext))

69− --> null 'PGtsvector

70−arrayToTSvector = unsafeFunction "array_to_tsvector"

71−

72−-- | number of lexemes in `Squeal.PostgreSQL.Expression.Type.tsvector`

73−tsvectorLength :: null 'PGtsvector --> null 'PGint4

74−tsvectorLength = unsafeFunction "length"

75−

76−-- | number of lexemes plus operators in `Squeal.PostgreSQL.Expression.Type.tsquery`

77−numnode :: null 'PGtsquery --> null 'PGint4

78−numnode = unsafeFunction "numnode"

79−

80−-- | produce `Squeal.PostgreSQL.Expression.Type.tsquery` ignoring punctuation

81−plainToTSquery :: null 'PGtext --> null 'PGtsquery

82−plainToTSquery = unsafeFunction "plainto_tsquery"

83−

84−-- | produce `Squeal.PostgreSQL.Expression.Type.tsquery` that searches for a phrase,

85−-- ignoring punctuation

86−phraseToTSquery :: null 'PGtext --> null 'PGtsquery

87−phraseToTSquery = unsafeFunction "phraseto_tsquery"

88−

89−-- | produce `Squeal.PostgreSQL.Expression.Type.tsquery` from a web search style query

90−websearchToTSquery :: null 'PGtext --> null 'PGtsquery

91−websearchToTSquery = unsafeFunction "websearch_to_tsquery"

92−

93−-- | get indexable part of a `Squeal.PostgreSQL.Expression.Type.tsquery`

94−queryTree :: null 'PGtsquery --> null 'PGtext

95−queryTree = unsafeFunction "query_tree"

96−

97−-- | normalize words and convert to `Squeal.PostgreSQL.Expression.Type.tsquery`

98−toTSquery :: null 'PGtext --> null 'PGtsquery

99−toTSquery = unsafeFunction "to_tsquery"

100−

101−-- | reduce document text to `Squeal.PostgreSQL.Expression.Type.tsvector`

102−toTSvector

103− :: ty `In` '[ 'PGtext, 'PGjson, 'PGjsonb]

104− => null ty --> null 'PGtsvector

105−toTSvector = unsafeFunction "to_tsvector"

106−

107−-- | assign weight to each element of `Squeal.PostgreSQL.Expression.Type.tsvector`

108−setWeight :: '[null 'PGtsvector, null ('PGchar 1)] ---> null 'PGtsvector

109−setWeight = unsafeFunctionN "set_weight"

110−

111−-- | remove positions and weights from `Squeal.PostgreSQL.Expression.Type.tsvector`

112−strip :: null 'PGtsvector --> null 'PGtsvector

113−strip = unsafeFunction "strip"

114−

115−-- | @jsonToTSvector (document *: filter)@

116−-- reduce each value in the document, specified by filter to a `Squeal.PostgreSQL.Expression.Type.tsvector`,

117−-- and then concatenate those in document order to produce a single `Squeal.PostgreSQL.Expression.Type.tsvector`.

118−-- filter is a `Squeal.PostgreSQL.Expression.Type.json` array, that enumerates what kind of elements

119−-- need to be included into the resulting `Squeal.PostgreSQL.Expression.Type.tsvector`.

120−-- Possible values for filter are "string" (to include all string values),

121−-- "numeric" (to include all numeric values in the string format),

122−-- "boolean" (to include all Boolean values in the string format "true"/"false"),

123−-- "key" (to include all keys) or "all" (to include all above).

124−-- These values can be combined together to include, e.g. all string and numeric values.

125−jsonToTSvector :: '[null 'PGjson, null 'PGjson] ---> null 'PGtsvector

126−jsonToTSvector = unsafeFunctionN "json_to_tsvector"

127−

128−-- | @jsonbToTSvector (document *: filter)@

129−-- reduce each value in the document, specified by filter to a `Squeal.PostgreSQL.Expression.Type.tsvector`,

130−-- and then concatenate those in document order to produce a single `Squeal.PostgreSQL.Expression.Type.tsvector`.

131−-- filter is a `Squeal.PostgreSQL.Expression.Type.jsonb` array, that enumerates what kind of elements

132−-- need to be included into the resulting `Squeal.PostgreSQL.Expression.Type.tsvector`.

133−-- Possible values for filter are "string" (to include all string values),

134−-- "numeric" (to include all numeric values in the string format),

135−-- "boolean" (to include all Boolean values in the string format "true"/"false"),

136−-- "key" (to include all keys) or "all" (to include all above).

137−-- These values can be combined together to include, e.g. all string and numeric values.

138−jsonbToTSvector :: '[null 'PGjsonb, null 'PGjsonb] ---> null 'PGtsvector

139−jsonbToTSvector = unsafeFunctionN "jsonb_to_tsvector"

140−

141−-- | remove given lexeme from `Squeal.PostgreSQL.Expression.Type.tsvector`

142−tsDelete ::

143− '[null 'PGtsvector, null ('PGvararray ('NotNull 'PGtext))]

144− ---> null 'PGtsvector

145−tsDelete = unsafeFunctionN "ts_delete"

146−

147−-- | select only elements with given weights from `Squeal.PostgreSQL.Expression.Type.tsvector`

148−tsFilter ::

149− '[null 'PGtsvector, null ('PGvararray ('NotNull ('PGchar 1)))]

150− ---> null 'PGtsvector

151−tsFilter = unsafeFunctionN "ts_filter"

152−

153−-- | display a `Squeal.PostgreSQL.Expression.Type.tsquery` match

154−tsHeadline

155− :: document `In` '[ 'PGtext, 'PGjson, 'PGjsonb]

156− => '[null document, null 'PGtsquery] ---> null 'PGtext

157−tsHeadline = unsafeFunctionN "ts_headline"

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Time.hsdeleted−192

@@ -1,192 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Time

3−Description: Date/Time expressions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Date/Time functions and operators

9−-}

10−

11−{-# LANGUAGE

12− DataKinds

13− , DeriveGeneric

14− , FunctionalDependencies

15− , LambdaCase

16− , MultiParamTypeClasses

17− , OverloadedStrings

18− , PolyKinds

19− , RankNTypes

20− , TypeOperators

21−#-}

22−

23−module Squeal.PostgreSQL.Expression.Time

24− ( TimeOp (..)

25− , currentDate

26− , currentTime

27− , currentTimestamp

28− , localTime

29− , localTimestamp

30− , now

31− , makeDate

32− , makeTime

33− , makeTimestamp

34− , makeTimestamptz

35− , interval_

36− , TimeUnit (..)

37− ) where

38−

39−import Data.String

40−

41−import qualified GHC.Generics as GHC

42−import qualified Generics.SOP as SOP

43−

44−import Squeal.PostgreSQL.Expression

45−import Squeal.PostgreSQL.Render

46−import Squeal.PostgreSQL.Schema

47−

48−-- $setup

49−-- >>> import Squeal.PostgreSQL

50−

51−-- | >>> printSQL currentDate

52−-- CURRENT_DATE

53−currentDate :: Expr (null 'PGdate)

54−currentDate = UnsafeExpression "CURRENT_DATE"

55−

56−-- | >>> printSQL currentTime

57−-- CURRENT_TIME

58−currentTime :: Expr (null 'PGtimetz)

59−currentTime = UnsafeExpression "CURRENT_TIME"

60−

61−-- | >>> printSQL currentTimestamp

62−-- CURRENT_TIMESTAMP

63−currentTimestamp :: Expr (null 'PGtimestamptz)

64−currentTimestamp = UnsafeExpression "CURRENT_TIMESTAMP"

65−

66−-- | >>> printSQL localTime

67−-- LOCALTIME

68−localTime :: Expr (null 'PGtime)

69−localTime = UnsafeExpression "LOCALTIME"

70−

71−-- | >>> printSQL localTimestamp

72−-- LOCALTIMESTAMP

73−localTimestamp :: Expr (null 'PGtimestamp)

74−localTimestamp = UnsafeExpression "LOCALTIMESTAMP"

75−

76−-- | Current date and time (equivalent to `currentTimestamp`)

77−--

78−-- >>> printSQL now

79−-- now()

80−now :: Expr (null 'PGtimestamptz)

81−now = UnsafeExpression "now()"

82−

83−{-|

84−Create date from year, month and day fields

85−

86−>>> printSQL (makeDate (1984 :* 7 *: 3))

87−make_date(1984, 7, 3)

88−-}

89−makeDate :: '[ null 'PGint4, null 'PGint4, null 'PGint4 ] ---> null 'PGdate

90−makeDate = unsafeFunctionN "make_date"

91−

92−{-|

93−Create time from hour, minute and seconds fields

94−

95−>>> printSQL (makeTime (8 :* 15 *: 23.5))

96−make_time(8, 15, 23.5)

97−-}

98−makeTime :: '[ null 'PGint4, null 'PGint4, null 'PGfloat8 ] ---> null 'PGtime

99−makeTime = unsafeFunctionN "make_time"

100−

101−{-|

102−Create timestamp from year, month, day, hour, minute and seconds fields

103−

104−>>> printSQL (makeTimestamp (2013 :* 7 :* 15 :* 8 :* 15 *: 23.5))

105−make_timestamp(2013, 7, 15, 8, 15, 23.5)

106−-}

107−makeTimestamp ::

108− '[ null 'PGint4, null 'PGint4, null 'PGint4

109− , null 'PGint4, null 'PGint4, null 'PGfloat8 ] ---> null 'PGtimestamp

110−makeTimestamp = unsafeFunctionN "make_timestamp"

111−

112−{-|

113−Create timestamp with time zone from

114−year, month, day, hour, minute and seconds fields;

115−the current time zone is used

116−

117−>>> printSQL (makeTimestamptz (2013 :* 7 :* 15 :* 8 :* 15 *: 23.5))

118−make_timestamptz(2013, 7, 15, 8, 15, 23.5)

119−-}

120−makeTimestamptz ::

121− '[ null 'PGint4, null 'PGint4, null 'PGint4

122− , null 'PGint4, null 'PGint4, null 'PGfloat8 ] ---> null 'PGtimestamptz

123−makeTimestamptz = unsafeFunctionN "make_timestamptz"

124−

125−{-|

126−Affine space operations on time types.

127−-}

128−class TimeOp time diff | time -> diff where

129− {-|

130− >>> printSQL (makeDate (1984 :* 7 *: 3) !+ 365)

131− (make_date(1984, 7, 3) + 365)

132− -}

133− (!+) :: Operator (null time) (null diff) (null time)

134− (!+) = unsafeBinaryOp "+"

135− {-|

136− >>> printSQL (365 +! makeDate (1984 :* 7 *: 3))

137− (365 + make_date(1984, 7, 3))

138− -}

139− (+!) :: Operator (null diff) (null time) (null time)

140− (+!) = unsafeBinaryOp "+"

141− {-|

142− >>> printSQL (makeDate (1984 :* 7 *: 3) !- 365)

143− (make_date(1984, 7, 3) - 365)

144− -}

145− (!-) :: Operator (null time) (null diff) (null time)

146− (!-) = unsafeBinaryOp "-"

147− {-|

148− >>> printSQL (makeDate (1984 :* 7 *: 3) !-! currentDate)

149− (make_date(1984, 7, 3) - CURRENT_DATE)

150− -}

151− (!-!) :: Operator (null time) (null time) (null diff)

152− (!-!) = unsafeBinaryOp "-"

153−instance TimeOp 'PGtimestamp 'PGinterval

154−instance TimeOp 'PGtimestamptz 'PGinterval

155−instance TimeOp 'PGtime 'PGinterval

156−instance TimeOp 'PGtimetz 'PGinterval

157−instance TimeOp 'PGinterval 'PGinterval

158−instance TimeOp 'PGdate 'PGint4

159−infixl 6 !+

160−infixl 6 +!

161−infixl 6 !-

162−infixl 6 !-!

163−

164−-- | A `TimeUnit` to use in `interval_` construction.

165−data TimeUnit

166− = Years | Months | Weeks | Days

167− | Hours | Minutes | Seconds

168− | Microseconds | Milliseconds

169− | Decades | Centuries | Millennia

170− deriving (Eq, Ord, Show, Read, Enum, GHC.Generic)

171−instance SOP.Generic TimeUnit

172−instance SOP.HasDatatypeInfo TimeUnit

173−instance RenderSQL TimeUnit where

174− renderSQL = \case

175− Years -> "years"

176− Months -> "months"

177− Weeks -> "weeks"

178− Days -> "days"

179− Hours -> "hours"

180− Minutes -> "minutes"

181− Seconds -> "seconds"

182− Microseconds -> "microseconds"

183− Milliseconds -> "milliseconds"

184− Decades -> "decades"

185− Centuries -> "centuries"

186− Millennia -> "millennia"

187−

188−-- | >>> printSQL $ interval_ 7 Days

189−-- (INTERVAL '7.0 days')

190−interval_ :: Double -> TimeUnit -> Expr (null 'PGinterval)

191−interval_ num unit = UnsafeExpression . parenthesized $ "INTERVAL" <+>

192− "'" <> fromString (show num) <+> renderSQL unit <> "'"

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Type.hsdeleted−446

@@ -1,446 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression

3−Description: Type expressions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Type expressions.

9−-}

10−

11−{-# LANGUAGE

12− AllowAmbiguousTypes

13− , DataKinds

14− , DeriveGeneric

15− , FlexibleContexts

16− , FlexibleInstances

17− , GADTs

18− , GeneralizedNewtypeDeriving

19− , KindSignatures

20− , MultiParamTypeClasses

21− , OverloadedStrings

22− , RankNTypes

23− , ScopedTypeVariables

24− , TypeApplications

25− , TypeOperators

26− , UndecidableInstances

27−#-}

28−

29−module Squeal.PostgreSQL.Expression.Type

30− ( -- * type casting

31− cast

32− , astype

33− , inferredtype

34− -- * type expressions

35− , TypeExpression (..)

36− , typedef

37− , typetable

38− , typeview

39− , bool

40− , int2

41− , smallint

42− , int4

43− , int

44− , integer

45− , int8

46− , bigint

47− , numeric

48− , float4

49− , real

50− , float8

51− , doublePrecision

52− , money

53− , text

54− , char

55− , character

56− , varchar

57− , characterVarying

58− , bytea

59− , timestamp

60− , timestampWithTimeZone

61− , timestamptz

62− , date

63− , time

64− , timeWithTimeZone

65− , timetz

66− , interval

67− , uuid

68− , inet

69− , json

70− , jsonb

71− , vararray

72− , fixarray

73− , tsvector

74− , tsquery

75− , oid

76− , int4range

77− , int8range

78− , numrange

79− , tsrange

80− , tstzrange

81− , daterange

82− -- * column type definitions

83− , ColumnTypeExpression (..)

84− , nullable

85− , notNullable

86− , default_

87− , serial2

88− , smallserial

89− , serial4

90− , serial

91− , serial8

92− , bigserial

93− , hask

94− -- * type inference

95− , PGTyped (..)

96− , PGNullityTyped (..)

97− , FieldTyped (..)

98− ) where

99−

100−import Control.DeepSeq

101−import Data.ByteString

102−import Data.String

103−import GHC.TypeLits

104−

105−import qualified Data.ByteString as ByteString

106−import qualified GHC.Generics as GHC

107−import qualified Generics.SOP as SOP

108−

109−import Squeal.PostgreSQL.Alias

110−import Squeal.PostgreSQL.Expression

111−import Squeal.PostgreSQL.PG

112−import Squeal.PostgreSQL.Render

113−import Squeal.PostgreSQL.Schema

114−

115−-- $setup

116−-- >>> import Squeal.PostgreSQL

117−

118−-- When a `cast` is applied to an `Expression` of a known type, it

119−-- represents a run-time type conversion. The cast will succeed only if a

120−-- suitable type conversion operation has been defined.

121−--

122−-- | >>> printSQL $ true & cast int4

123−-- (TRUE :: int4)

124−cast

125− :: TypeExpression schemas ty1

126− -- ^ type to cast as

127− -> Expression outer commons grp schemas params from ty0

128− -- ^ value to convert

129− -> Expression outer commons grp schemas params from ty1

130−cast ty x = UnsafeExpression $ parenthesized $

131− renderSQL x <+> "::" <+> renderSQL ty

132−

133−-- | A safe version of `cast` which just matches a value with its type.

134−--

135−-- >>> printSQL (1 & astype int)

136−-- (1 :: int)

137−astype

138− :: TypeExpression schemas ty

139− -- ^ type to specify as

140− -> Expression outer commons grp schemas params from ty

141− -- ^ value

142− -> Expression outer commons grp schemas params from ty

143−astype = cast

144−

145−-- | `inferredtype` will add a type annotation to an `Expression`

146−-- which can be useful for fixing the storage type of a value.

147−--

148−-- >>> printSQL (inferredtype true)

149−-- (TRUE :: bool)

150−inferredtype

151− :: PGTyped schemas ty

152− => Expression outer common grp schemas params from ty

153− -- ^ value

154− -> Expression outer common grp schemas params from ty

155−inferredtype = astype pgtype

156−

157−{-----------------------------------------

158−type expressions

159−-----------------------------------------}

160−

161−-- | `TypeExpression`s are used in `cast`s and

162−-- `Squeal.PostgreSQL.Definition.createTable` commands.

163−newtype TypeExpression (schemas :: SchemasType) (ty :: NullityType)

164− = UnsafeTypeExpression { renderTypeExpression :: ByteString }

165− deriving (GHC.Generic,Show,Eq,Ord,NFData)

166−instance RenderSQL (TypeExpression schemas ty) where

167− renderSQL = renderTypeExpression

168−

169−-- | The enum or composite type in a `Typedef` can be expressed by its alias.

170−typedef

171− :: (Has sch schemas schema, Has td schema ('Typedef ty))

172− => QualifiedAlias sch td

173− -- ^ type alias

174− -> TypeExpression schemas (null ty)

175−typedef = UnsafeTypeExpression . renderSQL

176−

177−-- | The composite type corresponding to a `Table` definition can be expressed

178−-- by its alias.

179−typetable

180− :: (Has sch schemas schema, Has tab schema ('Table table))

181− => QualifiedAlias sch tab

182− -- ^ table alias

183− -> TypeExpression schemas (null ('PGcomposite (TableToRow table)))

184−typetable = UnsafeTypeExpression . renderSQL

185−

186−-- | The composite type corresponding to a `View` definition can be expressed

187−-- by its alias.

188−typeview

189− :: (Has sch schemas schema, Has vw schema ('View view))

190− => QualifiedAlias sch vw

191− -- ^ view alias

192− -> TypeExpression schemas (null ('PGcomposite view))

193−typeview = UnsafeTypeExpression . renderSQL

194−

195−-- | logical Boolean (true/false)

196−bool :: TypeExpression schemas (null 'PGbool)

197−bool = UnsafeTypeExpression "bool"

198−-- | signed two-byte integer

199−int2, smallint :: TypeExpression schemas (null 'PGint2)

200−int2 = UnsafeTypeExpression "int2"

201−smallint = UnsafeTypeExpression "smallint"

202−-- | signed four-byte integer

203−int4, int, integer :: TypeExpression schemas (null 'PGint4)

204−int4 = UnsafeTypeExpression "int4"

205−int = UnsafeTypeExpression "int"

206−integer = UnsafeTypeExpression "integer"

207−-- | signed eight-byte integer

208−int8, bigint :: TypeExpression schemas (null 'PGint8)

209−int8 = UnsafeTypeExpression "int8"

210−bigint = UnsafeTypeExpression "bigint"

211−-- | arbitrary precision numeric type

212−numeric :: TypeExpression schemas (null 'PGnumeric)

213−numeric = UnsafeTypeExpression "numeric"

214−-- | single precision floating-point number (4 bytes)

215−float4, real :: TypeExpression schemas (null 'PGfloat4)

216−float4 = UnsafeTypeExpression "float4"

217−real = UnsafeTypeExpression "real"

218−-- | double precision floating-point number (8 bytes)

219−float8, doublePrecision :: TypeExpression schemas (null 'PGfloat8)

220−float8 = UnsafeTypeExpression "float8"

221−doublePrecision = UnsafeTypeExpression "double precision"

222−-- | currency amount

223−money :: TypeExpression schema (null 'PGmoney)

224−money = UnsafeTypeExpression "money"

225−-- | variable-length character string

226−text :: TypeExpression schemas (null 'PGtext)

227−text = UnsafeTypeExpression "text"

228−-- | fixed-length character string

229−char, character

230− :: forall n schemas null. (KnownNat n, 1 <= n)

231− => TypeExpression schemas (null ('PGchar n))

232−char = UnsafeTypeExpression $ "char(" <> renderNat @n <> ")"

233−character = UnsafeTypeExpression $ "character(" <> renderNat @n <> ")"

234−-- | variable-length character string

235−varchar, characterVarying

236− :: forall n schemas null. (KnownNat n, 1 <= n)

237− => TypeExpression schemas (null ('PGvarchar n))

238−varchar = UnsafeTypeExpression $ "varchar(" <> renderNat @n <> ")"

239−characterVarying = UnsafeTypeExpression $

240− "character varying(" <> renderNat @n <> ")"

241−-- | binary data ("byte array")

242−bytea :: TypeExpression schemas (null 'PGbytea)

243−bytea = UnsafeTypeExpression "bytea"

244−-- | date and time (no time zone)

245−timestamp :: TypeExpression schemas (null 'PGtimestamp)

246−timestamp = UnsafeTypeExpression "timestamp"

247−-- | date and time, including time zone

248−timestampWithTimeZone, timestamptz :: TypeExpression schemas (null 'PGtimestamptz)

249−timestampWithTimeZone = UnsafeTypeExpression "timestamp with time zone"

250−timestamptz = UnsafeTypeExpression "timestamptz"

251−-- | calendar date (year, month, day)

252−date :: TypeExpression schemas (null 'PGdate)

253−date = UnsafeTypeExpression "date"

254−-- | time of day (no time zone)

255−time :: TypeExpression schemas (null 'PGtime)

256−time = UnsafeTypeExpression "time"

257−-- | time of day, including time zone

258−timeWithTimeZone, timetz :: TypeExpression schemas (null 'PGtimetz)

259−timeWithTimeZone = UnsafeTypeExpression "time with time zone"

260−timetz = UnsafeTypeExpression "timetz"

261−-- | time span

262−interval :: TypeExpression schemas (null 'PGinterval)

263−interval = UnsafeTypeExpression "interval"

264−-- | universally unique identifier

265−uuid :: TypeExpression schemas (null 'PGuuid)

266−uuid = UnsafeTypeExpression "uuid"

267−-- | IPv4 or IPv6 host address

268−inet :: TypeExpression schemas (null 'PGinet)

269−inet = UnsafeTypeExpression "inet"

270−-- | textual JSON data

271−json :: TypeExpression schemas (null 'PGjson)

272−json = UnsafeTypeExpression "json"

273−-- | binary JSON data, decomposed

274−jsonb :: TypeExpression schemas (null 'PGjsonb)

275−jsonb = UnsafeTypeExpression "jsonb"

276−-- | variable length array

277−vararray

278− :: TypeExpression schemas pg

279− -> TypeExpression schemas (null ('PGvararray pg))

280−vararray ty = UnsafeTypeExpression $ renderSQL ty <> "[]"

281−-- | fixed length array

282−--

283−-- >>> renderSQL (fixarray @'[2] json)

284−-- "json[2]"

285−fixarray

286− :: forall dims schemas null pg. SOP.All KnownNat dims

287− => TypeExpression schemas pg

288− -> TypeExpression schemas (null ('PGfixarray dims pg))

289−fixarray ty = UnsafeTypeExpression $

290− renderSQL ty <> renderDims @dims

291− where

292− renderDims :: forall ns. SOP.All KnownNat ns => ByteString

293− renderDims =

294− ("[" <>)

295− . (<> "]")

296− . ByteString.intercalate "]["

297− . SOP.hcollapse

298− $ SOP.hcmap (SOP.Proxy @KnownNat)

299− (K . fromString . show . natVal)

300− (SOP.hpure SOP.Proxy :: SOP.NP SOP.Proxy ns)

301−-- | text search query

302−tsvector :: TypeExpression schemas (null 'PGtsvector)

303−tsvector = UnsafeTypeExpression "tsvector"

304−-- | text search document

305−tsquery :: TypeExpression schemas (null 'PGtsquery)

306−tsquery = UnsafeTypeExpression "tsquery"

307−-- | Object identifiers (OIDs) are used internally by PostgreSQL

308−-- as primary keys for various system tables.

309−oid :: TypeExpression schemas (null 'PGoid)

310−oid = UnsafeTypeExpression "oid"

311−-- | Range of integer

312−int4range :: TypeExpression schemas (null ('PGrange 'PGint4))

313−int4range = UnsafeTypeExpression "int4range"

314−-- | Range of bigint

315−int8range :: TypeExpression schemas (null ('PGrange 'PGint8))

316−int8range = UnsafeTypeExpression "int8range"

317−-- | Range of numeric

318−numrange :: TypeExpression schemas (null ('PGrange 'PGnumeric))

319−numrange = UnsafeTypeExpression "numrange"

320−-- | Range of timestamp without time zone

321−tsrange :: TypeExpression schemas (null ('PGrange 'PGtimestamp))

322−tsrange = UnsafeTypeExpression "tsrange"

323−-- | Range of timestamp with time zone

324−tstzrange :: TypeExpression schemas (null ('PGrange 'PGtimestamptz))

325−tstzrange = UnsafeTypeExpression "tstzrange"

326−-- | Range of date

327−daterange :: TypeExpression schemas (null ('PGrange 'PGdate))

328−daterange = UnsafeTypeExpression "daterange"

329−

330−-- | `pgtype` is a demoted version of a `PGType`

331−class PGTyped schemas (ty :: NullityType) where

332− pgtype :: TypeExpression schemas ty

333−instance PGTyped schemas (null 'PGbool) where pgtype = bool

334−instance PGTyped schemas (null 'PGint2) where pgtype = int2

335−instance PGTyped schemas (null 'PGint4) where pgtype = int4

336−instance PGTyped schemas (null 'PGint8) where pgtype = int8

337−instance PGTyped schemas (null 'PGnumeric) where pgtype = numeric

338−instance PGTyped schemas (null 'PGfloat4) where pgtype = float4

339−instance PGTyped schemas (null 'PGfloat8) where pgtype = float8

340−instance PGTyped schemas (null 'PGmoney) where pgtype = money

341−instance PGTyped schemas (null 'PGtext) where pgtype = text

342−instance (KnownNat n, 1 <= n)

343− => PGTyped schemas (null ('PGchar n)) where pgtype = char @n

344−instance (KnownNat n, 1 <= n)

345− => PGTyped schemas (null ('PGvarchar n)) where pgtype = varchar @n

346−instance PGTyped schemas (null 'PGbytea) where pgtype = bytea

347−instance PGTyped schemas (null 'PGtimestamp) where pgtype = timestamp

348−instance PGTyped schemas (null 'PGtimestamptz) where pgtype = timestampWithTimeZone

349−instance PGTyped schemas (null 'PGdate) where pgtype = date

350−instance PGTyped schemas (null 'PGtime) where pgtype = time

351−instance PGTyped schemas (null 'PGtimetz) where pgtype = timeWithTimeZone

352−instance PGTyped schemas (null 'PGinterval) where pgtype = interval

353−instance PGTyped schemas (null 'PGuuid) where pgtype = uuid

354−instance PGTyped schemas (null 'PGjson) where pgtype = json

355−instance PGTyped schemas (null 'PGjsonb) where pgtype = jsonb

356−instance PGTyped schemas ty

357− => PGTyped schemas (null ('PGvararray ty)) where

358− pgtype = vararray (pgtype @schemas @ty)

359−instance (SOP.All KnownNat dims, PGTyped schemas ty)

360− => PGTyped schemas (null ('PGfixarray dims ty)) where

361− pgtype = fixarray @dims (pgtype @schemas @ty)

362−instance PGTyped schemas (null 'PGtsvector) where pgtype = tsvector

363−instance PGTyped schemas (null 'PGtsquery) where pgtype = tsquery

364−instance PGTyped schemas (null 'PGoid) where pgtype = oid

365−instance PGTyped schemas (null ('PGrange 'PGint4)) where pgtype = int4range

366−instance PGTyped schemas (null ('PGrange 'PGint8)) where pgtype = int8range

367−instance PGTyped schemas (null ('PGrange 'PGnumeric)) where pgtype = numrange

368−instance PGTyped schemas (null ('PGrange 'PGtimestamp)) where pgtype = tsrange

369−instance PGTyped schemas (null ('PGrange 'PGtimestamptz)) where pgtype = tstzrange

370−instance PGTyped schemas (null ('PGrange 'PGdate)) where pgtype = daterange

371−

372−-- | Lift `PGTyped` to a field

373−class FieldTyped schemas ty where

374− fieldtype :: Aliased (TypeExpression schemas) ty

375−instance (KnownSymbol alias, PGTyped schemas ty)

376− => FieldTyped schemas (alias ::: ty) where

377− fieldtype = pgtype `As` Alias

378−

379−-- | `ColumnTypeExpression`s are used in `createTable` commands.

380−newtype ColumnTypeExpression (schemas :: SchemasType) (ty :: ColumnType)

381− = UnsafeColumnTypeExpression { renderColumnTypeExpression :: ByteString }

382− deriving (GHC.Generic,Show,Eq,Ord,NFData)

383−instance RenderSQL (ColumnTypeExpression schemas ty) where

384− renderSQL = renderColumnTypeExpression

385−

386−-- | used in `createTable` commands as a column constraint to note that

387−-- @NULL@ may be present in a column

388−nullable

389− :: TypeExpression schemas (nullity ty)

390− -> ColumnTypeExpression schemas ('NoDef :=> 'Null ty)

391−nullable ty = UnsafeColumnTypeExpression $ renderSQL ty <+> "NULL"

392−

393−-- | used in `createTable` commands as a column constraint to ensure

394−-- @NULL@ is not present in a column

395−notNullable

396− :: TypeExpression schemas (nullity ty)

397− -> ColumnTypeExpression schemas ('NoDef :=> 'NotNull ty)

398−notNullable ty = UnsafeColumnTypeExpression $ renderSQL ty <+> "NOT NULL"

399−

400−-- | used in `createTable` commands as a column constraint to give a default

401−default_

402− :: Expression '[] '[] 'Ungrouped schemas '[] '[] ty

403− -> ColumnTypeExpression schemas ('NoDef :=> ty)

404− -> ColumnTypeExpression schemas ('Def :=> ty)

405−default_ x ty = UnsafeColumnTypeExpression $

406− renderSQL ty <+> "DEFAULT" <+> renderExpression x

407−

408−-- | not a true type, but merely a notational convenience for creating

409−-- unique identifier columns with type `PGint2`

410−serial2, smallserial

411− :: ColumnTypeExpression schemas ('Def :=> 'NotNull 'PGint2)

412−serial2 = UnsafeColumnTypeExpression "serial2"

413−smallserial = UnsafeColumnTypeExpression "smallserial"

414−-- | not a true type, but merely a notational convenience for creating

415−-- unique identifier columns with type `PGint4`

416−serial4, serial

417− :: ColumnTypeExpression schemas ('Def :=> 'NotNull 'PGint4)

418−serial4 = UnsafeColumnTypeExpression "serial4"

419−serial = UnsafeColumnTypeExpression "serial"

420−-- | not a true type, but merely a notational convenience for creating

421−-- unique identifier columns with type `PGint8`

422−serial8, bigserial

423− :: ColumnTypeExpression schemas ('Def :=> 'NotNull 'PGint8)

424−serial8 = UnsafeColumnTypeExpression "serial8"

425−bigserial = UnsafeColumnTypeExpression "bigserial"

426−

427−-- | Like @PGTyped@ but also accounts for nullity.

428−class PGNullityTyped schemas (nullty :: NullityType) where

429− pgNullityType :: ColumnTypeExpression schemas ('NoDef :=> nullty)

430−

431−instance PGTyped schemas ('Null ty) => PGNullityTyped schemas ('Null ty) where

432− pgNullityType = nullable (pgtype @_ @('Null ty))

433−

434−instance PGTyped schemas ('NotNull ty) => PGNullityTyped schemas ('NotNull ty) where

435− pgNullityType = notNullable (pgtype @_ @('NotNull ty))

436−

437−-- | Allow you to specify pg column types in relation to haskell types.

438−-- >>> printSQL $ hask @(Maybe String)

439−-- text NULL

440−--

441−-- >>> printSQL $ hask @Double

442−-- float8 NOT NULL

443−hask

444− :: forall hask schemas. PGNullityTyped schemas (NullPG hask)

445− => ColumnTypeExpression schemas ('NoDef :=> NullPG hask)

446−hask = pgNullityType

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Window.hsdeleted−284

@@ -1,284 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.Expression.Window

3−Description: Window functions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Window functions and definitions

9−-}

10−

11−{-# LANGUAGE

12− DataKinds

13− , DeriveGeneric

14− , FlexibleContexts

15− , FlexibleInstances

16− , GADTs

17− , GeneralizedNewtypeDeriving

18− , LambdaCase

19− , MultiParamTypeClasses

20− , OverloadedStrings

21− , RankNTypes

22− , KindSignatures

23−#-}

24−

25−module Squeal.PostgreSQL.Expression.Window

26− ( -- * functions

27− partitionBy

28− , rank

29− , rowNumber

30− , denseRank

31− , percentRank

32− , cumeDist

33− , ntile

34− , lag

35− , lead

36− , firstValue

37− , lastValue

38− , nthValue

39− , unsafeWindowFunction1

40− , unsafeWindowFunctionN

41− -- * types

42− , WindowFunction (..)

43− , WindowDefinition (..)

44− , WinFun0

45− , WinFun1

46− , WinFunN

47− ) where

48−

49−import Control.DeepSeq

50−import Data.ByteString

51−

52−import qualified GHC.Generics as GHC

53−import qualified Generics.SOP as SOP

54−

55−import Squeal.PostgreSQL.Alias

56−import Squeal.PostgreSQL.Expression

57−import Squeal.PostgreSQL.Expression.Aggregate

58−import Squeal.PostgreSQL.Expression.Sort

59−import Squeal.PostgreSQL.List

60−import Squeal.PostgreSQL.Render

61−import Squeal.PostgreSQL.Schema

62−

63−instance Aggregate

64− (Expression outer commons grp schemas params from)

65− (NP (Expression outer commons grp schemas params from))

66− (WindowFunction outer commons grp schemas params from) where

67− countStar = UnsafeWindowFunction "count(*)"

68− count = unsafeWindowFunction1 "count"

69− sum_ = unsafeWindowFunction1 "sum"

70− arrayAgg = unsafeWindowFunction1 "array_agg"

71− jsonAgg = unsafeWindowFunction1 "json_agg"

72− jsonbAgg = unsafeWindowFunction1 "jsonb_agg"

73− bitAnd = unsafeWindowFunction1 "bit_and"

74− bitOr = unsafeWindowFunction1 "bit_or"

75− boolAnd = unsafeWindowFunction1 "bool_and"

76− boolOr = unsafeWindowFunction1 "bool_or"

77− every = unsafeWindowFunction1 "every"

78− max_ = unsafeWindowFunction1 "max"

79− min_ = unsafeWindowFunction1 "min"

80− avg = unsafeWindowFunction1 "avg"

81− corr = unsafeWindowFunctionN "corr"

82− covarPop = unsafeWindowFunctionN "covar_pop"

83− covarSamp = unsafeWindowFunctionN "covar_samp"

84− regrAvgX = unsafeWindowFunctionN "regr_avgx"

85− regrAvgY = unsafeWindowFunctionN "regr_avgy"

86− regrCount = unsafeWindowFunctionN "regr_count"

87− regrIntercept = unsafeWindowFunctionN "regr_intercept"

88− regrR2 = unsafeWindowFunctionN "regr_r2"

89− regrSlope = unsafeWindowFunctionN "regr_slope"

90− regrSxx = unsafeWindowFunctionN "regr_sxx"

91− regrSxy = unsafeWindowFunctionN "regr_sxy"

92− regrSyy = unsafeWindowFunctionN "regr_syy"

93− stddev = unsafeWindowFunction1 "stddev"

94− stddevPop = unsafeWindowFunction1 "stddev_pop"

95− stddevSamp = unsafeWindowFunction1 "stddev_samp"

96− variance = unsafeWindowFunction1 "variance"

97− varPop = unsafeWindowFunction1 "var_pop"

98− varSamp = unsafeWindowFunction1 "var_samp"

99−

100−-- | A `WindowDefinition` is a set of table rows that are somehow related

101−-- to the current row

102−data WindowDefinition outer commons grp schemas params from where

103− WindowDefinition

104− :: SOP.SListI bys

105− => NP (Expression outer commons grp schemas params from) bys

106− -- ^ `partitionBy` clause

107− -> [SortExpression outer commons grp schemas params from]

108− -- ^ `Squeal.PostgreSQL.Expression.Sort.orderBy` clause

109− -> WindowDefinition outer commons grp schemas params from

110−

111−instance OrderBy WindowDefinition where

112− orderBy sortsR (WindowDefinition parts sortsL)

113− = WindowDefinition parts (sortsL ++ sortsR)

114−

115−instance RenderSQL (WindowDefinition outer commons schemas from grp params) where

116− renderSQL (WindowDefinition part ord) =

117− renderPartitionByClause part <> renderOrderByClause ord

118− where

119− renderPartitionByClause = \case

120− Nil -> ""

121− parts -> "PARTITION" <+> "BY" <+> renderCommaSeparated renderExpression parts

122− renderOrderByClause = \case

123− [] -> ""

124− srts -> " ORDER" <+> "BY"

125− <+> commaSeparated (renderSQL <$> srts)

126−

127−{- |

128−The `partitionBy` clause within `Squeal.PostgreSQL.Query.Over` divides the rows into groups,

129−or partitions, that share the same values of the `partitionBy` `Expression`(s).

130−For each row, the window function is computed across the rows that fall into

131−the same partition as the current row.

132−-}

133−partitionBy

134− :: SOP.SListI bys

135− => NP (Expression outer commons grp schemas params from) bys -- ^ partitions

136− -> WindowDefinition outer commons grp schemas params from

137−partitionBy bys = WindowDefinition bys []

138−

139−{- |

140−A window function performs a calculation across a set of table rows

141−that are somehow related to the current row. This is comparable to the type

142−of calculation that can be done with an aggregate function.

143−However, window functions do not cause rows to become grouped into a single

144−output row like non-window aggregate calls would.

145−Instead, the rows retain their separate identities.

146−Behind the scenes, the window function is able to access more than

147−just the current row of the query result.

148−-}

149−newtype WindowFunction

150− (outer :: FromType)

151− (commons :: FromType)

152− (grp :: Grouping)

153− (schemas :: SchemasType)

154− (params :: [NullityType])

155− (from :: FromType)

156− (ty :: NullityType)

157− = UnsafeWindowFunction { renderWindowFunction :: ByteString }

158− deriving (GHC.Generic,Show,Eq,Ord,NFData)

159−

160−instance RenderSQL (WindowFunction outer commons grp schemas params from ty) where

161− renderSQL = renderWindowFunction

162−

163−{- |

164−A @RankNType@ for window functions with no arguments.

165−-}

166−type WinFun0 x

167− = forall outer commons grp schemas params from

168− . WindowFunction outer commons grp schemas params from x

169− -- ^ cannot reference aliases

170−

171−{- |

172−A @RankNType@ for window functions with 1 argument.

173−-}

174−type WinFun1 x y

175− = forall outer commons grp schemas params from

176− . Expression outer commons grp schemas params from x

177− -- ^ input

178− -> WindowFunction outer commons grp schemas params from y

179− -- ^ output

180−

181−{- | A @RankNType@ for window functions with a fixed-length

182−list of heterogeneous arguments.

183−Use the `*:` operator to end your argument lists.

184−-}

185−type WinFunN xs y

186− = forall outer commons grp schemas params from

187− . NP (Expression outer commons grp schemas params from) xs

188− -- ^ inputs

189− -> WindowFunction outer commons grp schemas params from y

190− -- ^ output

191−

192−-- | escape hatch for defining window functions

193−unsafeWindowFunction1 :: ByteString -> WinFun1 x y

194−unsafeWindowFunction1 fun x

195− = UnsafeWindowFunction $ fun <> parenthesized (renderSQL x)

196−

197−-- | escape hatch for defining multi-argument window functions

198−unsafeWindowFunctionN :: SOP.SListI xs => ByteString -> WinFunN xs y

199−unsafeWindowFunctionN fun xs = UnsafeWindowFunction $ fun <>

200− parenthesized (renderCommaSeparated renderSQL xs)

201−

202−{- | rank of the current row with gaps; same as `rowNumber` of its first peer

203−

204−>>> printSQL rank

205−rank()

206−-}

207−rank :: WinFun0 ('NotNull 'PGint8)

208−rank = UnsafeWindowFunction "rank()"

209−

210−{- | number of the current row within its partition, counting from 1

211−

212−>>> printSQL rowNumber

213−row_number()

214−-}

215−rowNumber :: WinFun0 ('NotNull 'PGint8)

216−rowNumber = UnsafeWindowFunction "row_number()"

217−

218−{- | rank of the current row without gaps; this function counts peer groups

219−

220−>>> printSQL denseRank

221−dense_rank()

222−-}

223−denseRank :: WinFun0 ('NotNull 'PGint8)

224−denseRank = UnsafeWindowFunction "dense_rank()"

225−

226−{- | relative rank of the current row: (rank - 1) / (total partition rows - 1)

227−

228−>>> printSQL percentRank

229−percent_rank()

230−-}

231−percentRank :: WinFun0 ('NotNull 'PGfloat8)

232−percentRank = UnsafeWindowFunction "percent_rank()"

233−

234−{- | cumulative distribution: (number of partition rows

235−preceding or peer with current row) / total partition rows

236−

237−>>> printSQL cumeDist

238−cume_dist()

239−-}

240−cumeDist :: WinFun0 ('NotNull 'PGfloat8)

241−cumeDist = UnsafeWindowFunction "cume_dist()"

242−

243−{- | integer ranging from 1 to the argument value,

244−dividing the partition as equally as possible

245−

246−>>> printSQL $ ntile 5

247−ntile(5)

248−-}

249−ntile :: WinFun1 ('NotNull 'PGint4) ('NotNull 'PGint4)

250−ntile = unsafeWindowFunction1 "ntile"

251−

252−{- | returns value evaluated at the row that is offset rows before the current

253−row within the partition; if there is no such row, instead return default

254−(which must be of the same type as value). Both offset and default are

255−evaluated with respect to the current row.

256−-}

257−lag :: WinFunN '[ty, 'NotNull 'PGint4, ty] ty

258−lag = unsafeWindowFunctionN "lag"

259−

260−{- | returns value evaluated at the row that is offset rows after the current

261−row within the partition; if there is no such row, instead return default

262−(which must be of the same type as value). Both offset and default are

263−evaluated with respect to the current row.

264−-}

265−lead :: WinFunN '[ty, 'NotNull 'PGint4, ty] ty

266−lead = unsafeWindowFunctionN "lead"

267−

268−{- | returns value evaluated at the row that is the

269−first row of the window frame

270−-}

271−firstValue :: WinFun1 ty ty

272−firstValue = unsafeWindowFunction1 "first_value"

273−

274−{- | returns value evaluated at the row that is the

275−last row of the window frame

276−-}

277−lastValue :: WinFun1 ty ty

278−lastValue = unsafeWindowFunction1 "last_value"

279−

280−{- | returns value evaluated at the row that is the nth

281−row of the window frame (counting from 1); null if no such row

282−-}

283−nthValue :: WinFunN '[null ty, 'NotNull 'PGint4] ('Null ty)

284−nthValue = unsafeWindowFunctionN "nth_value"

squeal-postgresql/src/Squeal/PostgreSQL/List.hsdeleted−112

@@ -1,112 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.List

3−Description: List related types and functions

4−Copyright: (c) Eitan Chatav, 2019

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−Haskell singly-linked lists are very powerful. This module

9−provides functionality for type-level lists, heterogeneous

10−lists and type aligned lists.

11−-}

12−

13−{-# LANGUAGE

14− DataKinds

15− , FlexibleContexts

16− , GADTs

17− , LambdaCase

18− , MultiParamTypeClasses

19− , OverloadedStrings

20− , PolyKinds

21− , QuantifiedConstraints

22− , RankNTypes

23− , ScopedTypeVariables

24− , TypeApplications

25− , TypeFamilies

26− , TypeOperators

27− , UndecidableInstances

28−#-}

29−

30−module Squeal.PostgreSQL.List

31− ( SOP.NP (..)

32− , (*:)

33− , Join

34− , disjoin

35− , Additional (..)

36− , Path (..)

37− , CFunctor (..)

38− , CFoldable (..)

39− , CFree (..)

40− , Elem

41− , In

42− , Length

43− ) where

44−

45−import Control.Category.Free

46−import Data.Function ((&))

47−import Data.Kind

48−import Data.Type.Bool

49−import GHC.TypeLits

50−

51−import Generics.SOP as SOP

52−

53−-- | `Join` is simply promoted `++` and is used in @JOIN@s in

54−-- `Squeal.PostgreSQL.Query.FromClause`s.

55−type family Join xs ys where

56− Join '[] ys = ys

57− Join (x ': xs) ys = x ': Join xs ys

58−

59−-- | `disjoin` is a utility function for splitting an `NP` list into pieces.

60−disjoin

61− :: forall xs ys expr. SListI xs

62− => NP expr (Join xs ys)

63− -> (NP expr xs, NP expr ys)

64−disjoin = case sList @xs of

65− SNil -> \ys -> (Nil, ys)

66− SCons -> \(x :* xsys) ->

67− case disjoin xsys of (xs,ys) -> (x :* xs, ys)

68−

69−-- | The `Additional` class is for appending

70−-- type-level list parameterized constructors such as `NP`,

71−-- `Squeal.PostgreSQL.Query.Selection`, and `Squeal.PostgreSQL.Query.FromClause`.

72−class Additional expr where

73− also :: expr ys -> expr xs -> expr (Join xs ys)

74−instance Additional (NP expr) where

75− also ys = \case

76− Nil -> ys

77− x :* xs -> x :* (xs & also ys)

78−

79−-- | A useful operator for ending an `NP` list of length at least 2 without `Nil`.

80−(*:) :: f x -> f y -> NP f '[x,y]

81−x *: y = x :* y :* Nil

82−infixl 9 *:

83−

84−-- | @Elem@ is a promoted `Data.List.elem`.

85−type family Elem x xs where

86− Elem x '[] = 'False

87− Elem x (x ': _) = 'True

88− Elem x (_ ': x ': _) = 'True

89− Elem x (_ ': _ ': x ': _) = 'True

90− Elem x (_ ': _ ': _ ': x ': _) = 'True

91− Elem x (_ ': _ ': _ ': _ ': x ': _) = 'True

92− Elem x (_ ': _ ': _ ': _ ': _ ': x ': _) = 'True

93− Elem x (_ ': xs) = Elem x xs

94−

95−-- | @In x xs@ is a constraint that proves that @x@ is in @xs@.

96−type family In x xs :: Constraint where

97− In x xs = If (Elem x xs) (() :: Constraint)

98− (TypeError ('ShowType x ':<>: 'Text " is not in " ':<>: 'ShowType xs))

99−

100−{- | Calculate the `Length` of a type level list

101−

102−>>> :kind! Length '[Char,String,Bool,Double]

103−Length '[Char,String,Bool,Double] :: Nat

104−= 4

105−-}

106−type family Length (xs :: [k]) :: Nat where

107− Length (_ ': _ ': _ ': _ ': _ : xs) = 5 + Length xs

108− Length (_ ': _ ': _ ': _ : xs) = 4 + Length xs

109− Length (_ ': _ ': _ : xs) = 3 + Length xs

110− Length (_ ': _ : xs) = 2 + Length xs

111− Length (_ : xs) = 1 + Length xs

112− Length '[] = 0

squeal-postgresql/src/Squeal/PostgreSQL/Manipulation.hs+177−170

@@ -18,7 +18,6 @@ Squeal data manipulation language.

1818 , MultiParamTypeClasses

1919 , OverloadedStrings

2020 , PatternSynonyms

21− , QuantifiedConstraints

2221 , RankNTypes

2322 , ScopedTypeVariables

2423 , TypeApplications

@@ -30,9 +29,19 @@ Squeal data manipulation language.

3029

3130module Squeal.PostgreSQL.Manipulation

3231 ( -- * Manipulation

33− Manipulation_

34− , Manipulation (..)

32+ Manipulation (..)

33+ , Manipulation_

3534 , queryStatement

35+ , QueryClause (..)

36+ , pattern Values_

37+ , DefaultAliasable (..)

38+ , ColumnExpression (..)

39+ , ReturningClause (..)

40+ , pattern Returning_

41+ , ConflictClause (..)

42+ , ConflictTarget (..)

43+ , ConflictAction (..)

44+ , UsingClause (..)

3645 -- * Insert

3746 , insertInto

3847 , insertInto_

@@ -42,95 +51,37 @@ module Squeal.PostgreSQL.Manipulation

4251 -- * Delete

4352 , deleteFrom

4453 , deleteFrom_

45− -- * Clauses

46− , Optional (..)

47− , QueryClause (..)

48− , pattern Values_

49− , ReturningClause (..)

50− , pattern Returning_

51− , ConflictClause (..)

52− , ConflictTarget (..)

53− , ConflictAction (..)

54− , UsingClause (..)

54+ , also

5555 ) where

5656

5757import Control.DeepSeq

5858import Data.ByteString hiding (foldr)

5959import Data.Kind (Type)

60+import GHC.TypeLits (KnownSymbol)

6061

6162import qualified Generics.SOP as SOP

6263import qualified GHC.Generics as GHC

6364

64−import Squeal.PostgreSQL.Alias

65+import Squeal.PostgreSQL.Binary

6566import Squeal.PostgreSQL.Expression

66−import Squeal.PostgreSQL.Expression.Logic

67−import Squeal.PostgreSQL.List

68−import Squeal.PostgreSQL.PG

6967import Squeal.PostgreSQL.Render

7068import Squeal.PostgreSQL.Query

7169import Squeal.PostgreSQL.Schema

7270

73−-- $setup

74−-- >>> import Squeal.PostgreSQL

75−-- >>> import Data.Int

76−-- >>> import Data.Time

77−

7871{- |

7972A `Manipulation` is a statement which may modify data in the database,

8073but does not alter its schemas. Examples are inserts, updates and deletes.

8174A `Query` is also considered a `Manipulation` even though it does not modify data.

8275

83−The general `Manipulation` type is parameterized by

84−

85−* @commons :: FromType@ - scope for all `common` table expressions,

86−* @schemas :: SchemasType@ - scope for all `table`s and `view`s,

87−* @params :: [NullityType]@ - scope for all `Squeal.Expression.Parameter.parameter`s,

88−* @row :: RowType@ - return type of the `Query`.

89−-}

90−newtype Manipulation

91− (commons :: FromType)

92− (schemas :: SchemasType)

93− (params :: [NullityType])

94− (columns :: RowType)

95− = UnsafeManipulation { renderManipulation :: ByteString }

96− deriving (GHC.Generic,Show,Eq,Ord,NFData)

97−instance RenderSQL (Manipulation commons schemas params columns) where

98− renderSQL = renderManipulation

99−instance With Manipulation where

100− with Done manip = manip

101− with ctes manip = UnsafeManipulation $

102− "WITH" <+> commaSeparated (ctoList renderSQL ctes) <+> renderSQL manip

103−

104−{- |

105−The top level `Manipulation_` type is parameterized by a @schemas@ `SchemasType`,

106−against which the query is type-checked, an input @parameters@ Haskell `Type`,

107−and an ouput row Haskell `Type`.

108−

109−A top-level `Manipulation_` can be run

110−using `Squeal.PostgreSQL.PQ.manipulateParams`, or if @parameters = ()@

111−using `Squeal.PostgreSQL.PQ.manipulate`.

112−

113−Generally, @parameters@ will be a Haskell tuple or record whose entries

114−may be referenced using positional

115−`Squeal.PostgreSQL.Expression.Parameter.parameter`s and @row@ will be a

116−Haskell record, whose entries will be targeted using overloaded labels.

117−

118−>>> :set -XDeriveAnyClass -XDerivingStrategies

119−>>> :{

120−data Row a b = Row { col1 :: a, col2 :: b }

121− deriving stock (GHC.Generic)

122− deriving anyclass (SOP.Generic, SOP.HasDatatypeInfo)

123−:}

124−

12576simple insert:

12677

12778>>> type Columns = '["col1" ::: 'NoDef :=> 'Null 'PGint4, "col2" ::: 'Def :=> 'NotNull 'PGint4]

12879>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]

12980>>> :{

13081let

131− manipulation :: Manipulation_ (Public Schema) () ()

82+ manipulation :: Manipulation '[] (Public Schema) '[] '[]

13283 manipulation =

133− insertInto_ #tab (Values_ (Set 2 `as` #col1 :* Default `as` #col2))

84+ insertInto_ #tab (Values_ (2 `as` #col1 :* defaultAs #col2))

13485in printSQL manipulation

13586:}

13687INSERT INTO "tab" ("col1", "col2") VALUES (2, DEFAULT)

@@ -141,9 +92,9 @@ parameterized insert:

14192>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]

14293>>> :{

14394let

144− manipulation :: Manipulation_ (Public Schema) (Int32, Int32) ()

95+ manipulation :: Manipulation '[] (Public Schema) '[ 'NotNull 'PGint4, 'NotNull 'PGint4 ] '[]

14596 manipulation =

146− insertInto_ #tab (Values_ (Set (param @1) `as` #col1 :* Set (param @2) `as` #col2))

97+ insertInto_ #tab (Values_ (param @1 `as` #col1 :* param @2 `as` #col2))

14798in printSQL manipulation

14899:}

149100INSERT INTO "tab" ("col1", "col2") VALUES (($1 :: int4), ($2 :: int4))

@@ -152,9 +103,9 @@ returning insert:

152103

153104>>> :{

154105let

155− manipulation :: Manipulation_ (Public Schema) () (Only Int32)

106+ manipulation :: Manipulation '[] (Public Schema) '[] '["fromOnly" ::: 'NotNull 'PGint4]

156107 manipulation =

157− insertInto #tab (Values_ (Set 2 `as` #col1 :* Set 3 `as` #col2))

108+ insertInto #tab (Values_ (2 `as` #col1 :* 3 `as` #col2))

158109 OnConflictDoRaise (Returning (#col1 `as` #fromOnly))

159110in printSQL manipulation

160111:}

@@ -167,12 +118,12 @@ upsert:

167118>>> type CustomersSchema = '["customers" ::: 'Table (CustomersConstraints :=> CustomersColumns)]

168119>>> :{

169120let

170− manipulation :: Manipulation_ (Public CustomersSchema) () ()

121+ manipulation :: Manipulation '[] (Public CustomersSchema) '[] '[]

171122 manipulation =

172123 insertInto #customers

173− (Values_ (Set "John Smith" `as` #name :* Set "john@smith.com" `as` #email))

124+ (Values_ ("John Smith" `as` #name :* "john@smith.com" `as` #email))

174125 (OnConflict (OnConstraint #uq)

175− (DoUpdate (Set (#excluded ! #email <> "; " <> #customers ! #email) `as` #email) []))

126+ (DoUpdate (((#excluded ! #email) <> "; " <> (#customers ! #email)) `as` #email) []))

176127 (Returning_ Nil)

177128in printSQL manipulation

178129:}

@@ -182,7 +133,7 @@ query insert:

182133

183134>>> :{

184135let

185− manipulation :: Manipulation_ (Public Schema) () ()

136+ manipulation :: Manipulation '[] (Public Schema) '[] '[]

186137 manipulation = insertInto_ #tab (Subquery (select Star (from (table #tab))))

187138in printSQL manipulation

188139:}

@@ -192,8 +143,8 @@ update:

192143

193144>>> :{

194145let

195− manipulation :: Manipulation_ (Public Schema) () ()

196− manipulation = update_ #tab (Set 2 `as` #col1) (#col1 ./= #col2)

146+ manipulation :: Manipulation '[] (Public Schema) '[] '[]

147+ manipulation = update_ #tab (2 `as` #col1) (#col1 ./= #col2)

197148in printSQL manipulation

198149:}

199150UPDATE "tab" SET "col1" = 2 WHERE ("col1" <> "col2")

@@ -202,7 +153,9 @@ delete:

202153

203154>>> :{

204155let

205− manipulation :: Manipulation_ (Public Schema) () (Row Int32 Int32)

156+ manipulation :: Manipulation '[] (Public Schema) '[]

157+ '[ "col1" ::: 'NotNull 'PGint4

158+ , "col2" ::: 'NotNull 'PGint4 ]

206159 manipulation = deleteFrom #tab NoUsing (#col1 .== #col2) (Returning Star)

207160in printSQL manipulation

208161:}

@@ -213,13 +166,13 @@ delete and using clause:

213166>>> :{

214167type Schema3 =

215168 '[ "tab" ::: 'Table ('[] :=> Columns)

216− , "other_tab" ::: 'Table ('[] :=> Columns)

217− , "third_tab" ::: 'Table ('[] :=> Columns) ]

169+ , "other_tab" ::: 'Table ('[] :=> Columns)

170+ , "third_tab" ::: 'Table ('[] :=> Columns) ]

218171:}

219172

220173>>> :{

221174let

222− manipulation :: Manipulation_ (Public Schema3) () ()

175+ manipulation :: Manipulation '[] (Public Schema3) '[] '[]

223176 manipulation =

224177 deleteFrom #tab (Using (table #other_tab & also (table #third_tab)))

225178 ( (#tab ! #col2 .== #other_tab ! #col2)

@@ -235,7 +188,7 @@ with manipulation:

235188>>> type ProductsSchema = '["products" ::: 'Table ('[] :=> ProductsColumns), "products_deleted" ::: 'Table ('[] :=> ProductsColumns)]

236189>>> :{

237190let

238− manipulation :: Manipulation_ (Public ProductsSchema) (Only Day) ()

191+ manipulation :: Manipulation '[] (Public ProductsSchema) '[ 'NotNull 'PGdate] '[]

239192 manipulation = with

240193 (deleteFrom #products NoUsing (#date .< param @1) (Returning Star) `as` #del)

241194 (insertInto_ #products_deleted (Subquery (select Star (from (common #del)))))

@@ -243,13 +196,26 @@ in printSQL manipulation

243196:}

244197WITH "del" AS (DELETE FROM "products" WHERE ("date" < ($1 :: date)) RETURNING *) INSERT INTO "products_deleted" SELECT * FROM "del" AS "del"

245198-}

199+newtype Manipulation

200+ (commons :: FromType)

201+ (schemas :: SchemasType)

202+ (params :: [NullityType])

203+ (columns :: RowType)

204+ = UnsafeManipulation { renderManipulation :: ByteString }

205+ deriving (GHC.Generic,Show,Eq,Ord,NFData)

206+instance RenderSQL (Manipulation commons schemas params columns) where

207+ renderSQL = renderManipulation

208+instance With Manipulation where

209+ with Done manip = manip

210+ with ctes manip = UnsafeManipulation $

211+ "WITH" <+> renderSQL ctes <+> renderSQL manip

212+

246213type family Manipulation_ (schemas :: SchemasType) (params :: Type) (row :: Type) where

247214 Manipulation_ schemas params row = Manipulation '[] schemas (TuplePG params) (RowPG row)

248215

249216-- | Convert a `Query` into a `Manipulation`.

250217queryStatement

251218 :: Query '[] commons schemas params columns

252− -- ^ `Query` to embed as a `Manipulation`

253219 -> Manipulation commons schemas params columns

254220queryStatement q = UnsafeManipulation $ renderSQL q

255221

@@ -272,13 +238,9 @@ insertInto

272238 , SOP.SListI columns

273239 , SOP.SListI row1 )

274240 => QualifiedAlias sch tab

275− -- ^ table

276241 -> QueryClause commons schemas params columns

277− -- ^ what to insert

278242 -> ConflictClause tab commons schemas params table

279− -- ^ what to do in case of conflict

280243 -> ReturningClause commons schemas params '[tab ::: row0] row1

281− -- ^ what to return

282244 -> Manipulation commons schemas params row1

283245insertInto tab qry conflict ret = UnsafeManipulation $

284246 "INSERT" <+> "INTO" <+> renderSQL tab

@@ -286,7 +248,6 @@ insertInto tab qry conflict ret = UnsafeManipulation $

286248 <> renderSQL conflict

287249 <> renderSQL ret

288250

289−-- | Like `insertInto` but with `OnConflictDoRaise` and `no` `ReturningClause`.

290251insertInto_

291252 :: ( Has sch schemas schema

292253 , Has tab schema ('Table table)

@@ -294,33 +255,25 @@ insertInto_

294255 , row ~ TableToRow table

295256 , SOP.SListI columns )

296257 => QualifiedAlias sch tab

297− -- ^ table

298258 -> QueryClause commons schemas params columns

299− -- ^ what to insert

300259 -> Manipulation commons schemas params '[]

301260insertInto_ tab qry =

302261 insertInto tab qry OnConflictDoRaise (Returning_ Nil)

303262

304−-- | A `QueryClause` describes what to `insertInto` a table.

305263data QueryClause commons schemas params columns where

306264 Values

307265 :: SOP.SListI columns

308− => NP (Aliased (Optional (Expression '[] commons 'Ungrouped schemas params '[]))) columns

309− -- ^ row of values

310− -> [NP (Aliased (Optional (Expression '[] commons 'Ungrouped schemas params '[]))) columns]

311− -- ^ additional rows of values

266+ => NP (ColumnExpression 'Ungrouped schemas params '[]) columns

267+ -> [NP (ColumnExpression 'Ungrouped schemas params '[]) columns]

312268 -> QueryClause commons schemas params columns

313269 Select

314270 :: SOP.SListI columns

315− => NP (Aliased (Optional (Expression '[] commons grp schemas params from))) columns

316− -- ^ row of values

317− -> TableExpression '[] commons grp schemas params from

318− -- ^ from a table expression

271+ => NP (ColumnExpression grp schemas params from) columns

272+ -> TableExpression '[] grp commons schemas params from

319273 -> QueryClause commons schemas params columns

320274 Subquery

321275 :: ColumnsToRow columns ~ row

322276 => Query '[] commons schemas params row

323− -- ^ subquery to insert

324277 -> QueryClause commons schemas params columns

325278

326279instance RenderSQL (QueryClause commons schemas params columns) where

@@ -339,41 +292,109 @@ instance RenderSQL (QueryClause commons schemas params columns) where

339292 Subquery qry -> renderQuery qry

340293 where

341294 renderSQLPartMaybe, renderValuePartMaybe

342− :: Aliased (Optional (Expression '[] commons grp schemas params from)) column

343− -> Maybe ByteString

295+ :: ColumnExpression grp schemas params from column -> Maybe ByteString

344296 renderSQLPartMaybe = \case

345− Default `As` _ -> Nothing

346− Set _ `As` name -> Just $ renderSQL name

297+ DefaultAs _ -> Nothing

298+ Specific (_ `As` name) -> Just $ renderSQL name

347299 renderValuePartMaybe = \case

348− Default `As` _ -> Nothing

349− Set value `As` _ -> Just $ renderExpression value

300+ DefaultAs _ -> Nothing

301+ Specific (value `As` _) -> Just $ renderExpression value

350302 renderSQLPart, renderValuePart

351− :: Aliased (Optional (Expression '[] commons grp schemas params from)) column

352− -> ByteString

353− renderSQLPart (_ `As` name) = renderSQL name

354− renderValuePart (value `As` _) = renderSQL value

303+ :: ColumnExpression grp schemas params from column -> ByteString

304+ renderSQLPart = \case

305+ DefaultAs name -> renderSQL name

306+ Specific (_ `As` name) -> renderSQL name

307+ renderValuePart = \case

308+ DefaultAs _ -> "DEFAULT"

309+ Specific (value `As` _) -> renderExpression value

355310

356−-- | `Values_` describes a single `NP` list of `Aliased` `Optional` `Expression`s

357−-- whose `ColumnsType` must match the tables'.

358311pattern Values_

359312 :: SOP.SListI columns

360− => NP (Aliased (Optional (Expression '[] commons 'Ungrouped schemas params '[]))) columns

361− -- ^ row of values

313+ => NP (ColumnExpression 'Ungrouped schemas params '[]) columns

362314 -> QueryClause commons schemas params columns

363315pattern Values_ vals = Values vals []

364316

365−-- | `Optional` is either `Default` or a value, parameterized by an appropriate

366−-- `ColumnConstraint`.

367−data Optional expr ty where

368− -- | Use the `Default` value for a column.

369− Default :: Optional expr ('Def :=> ty)

370− -- | `Set` a value for a column.

371− Set :: expr ty -> Optional expr (def :=> ty)

372−

373−instance (forall x. RenderSQL (expr x)) => RenderSQL (Optional expr ty) where

317+data ColumnExpression grp schemas params from column where

318+ DefaultAs

319+ :: KnownSymbol col

320+ => Alias col

321+ -> ColumnExpression grp schemas params from (col ::: 'Def :=> ty)

322+ Specific

323+ :: Aliased (Expression '[] grp '[] schemas params from) (col ::: ty)

324+ -> ColumnExpression grp schemas params from (col ::: defness :=> ty)

325+

326+instance (KnownSymbol col, column ~ (col ::: defness :=> ty))

327+ => Aliasable col

328+ (Expression '[] grp '[] schemas params from ty)

329+ (ColumnExpression grp schemas params from column) where

330+ expression `as` col = Specific (expression `As` col)

331+instance (KnownSymbol col, columns ~ '[col ::: defness :=> ty])

332+ => Aliasable col

333+ (Expression '[] grp '[] schemas params from ty)

334+ (NP (ColumnExpression grp schemas params from) columns) where

335+ expression `as` col = expression `as` col :* Nil

336+instance (KnownSymbol col, column ~ (col ::: 'Def :=> ty))

337+ => DefaultAliasable col (ColumnExpression grp schemas params from column) where

338+ defaultAs = DefaultAs

339+instance (KnownSymbol col, columns ~ '[col ::: 'Def :=> ty])

340+ => DefaultAliasable col (NP (ColumnExpression grp schemas params from) columns) where

341+ defaultAs col = defaultAs col :* Nil

342+

343+instance (HasUnique tab from row, Has col row ty, column ~ (col ::: defness :=> ty))

344+ => IsLabel col (ColumnExpression 'Ungrouped schemas params from column) where

345+ fromLabel = fromLabel @col `as` Alias

346+instance (HasUnique tab from row, Has col row ty, columns ~ '[col ::: defness :=> ty])

347+ => IsLabel col

348+ (NP (ColumnExpression 'Ungrouped schemas params from) columns) where

349+ fromLabel = fromLabel @col `as` Alias

350+

351+instance (Has tab from row, Has col row ty, column ~ (col ::: defness :=> ty))

352+ => IsQualified tab col (ColumnExpression 'Ungrouped schemas params from column) where

353+ tab ! col = tab ! col `as` col

354+instance (Has tab from row, Has col row ty, columns ~ '[col ::: defness :=> ty])

355+ => IsQualified tab col (NP (ColumnExpression 'Ungrouped schemas params from) columns) where

356+ tab ! col = tab ! col `as` col

357+

358+instance

359+ ( HasUnique tab from row

360+ , Has col row ty

361+ , GroupedBy tab col bys

362+ , column ~ (col ::: defness :=> ty)

363+ ) => IsLabel col

364+ (ColumnExpression ('Grouped bys) schemas params from column) where

365+ fromLabel = fromLabel @col `as` Alias

366+instance

367+ ( HasUnique tab from row

368+ , Has col row ty

369+ , GroupedBy tab col bys

370+ , columns ~ '[col ::: defness :=> ty]

371+ ) => IsLabel col

372+ (NP (ColumnExpression ('Grouped bys) schemas params from) columns) where

373+ fromLabel = fromLabel @col `as` Alias

374+

375+instance

376+ ( Has tab from row

377+ , Has col row ty

378+ , GroupedBy tab col bys

379+ , column ~ (col ::: defness :=> ty)

380+ ) => IsQualified tab col

381+ (ColumnExpression ('Grouped bys) schemas params from column) where

382+ tab ! col = tab ! col `as` col

383+instance

384+ ( Has tab from row

385+ , Has col row ty

386+ , GroupedBy tab col bys

387+ , columns ~ '[col ::: defness :=> ty]

388+ ) => IsQualified tab col

389+ (NP (ColumnExpression ('Grouped bys) schemas params from) columns) where

390+ tab ! col = tab ! col :* Nil

391+

392+instance RenderSQL (ColumnExpression grp schemas params from column) where

374393 renderSQL = \case

375− Default -> "DEFAULT"

376− Set expr -> renderSQL expr

394+ DefaultAs col ->

395+ renderSQL col <+> "=" <+> "DEFAULT"

396+ Specific (expression `As` col) ->

397+ renderSQL col <+> "=" <+> renderSQL expression

377398

378399-- | A `ReturningClause` computes and return value(s) based

379400-- on each row actually inserted, updated or deleted. This is primarily

@@ -383,21 +404,19 @@ instance (forall x. RenderSQL (expr x)) => RenderSQL (Optional expr ty) where

383404-- deleted will be returned. For example, if a row was locked

384405-- but not updated because an `OnConflict` `DoUpdate` condition was not satisfied,

385406-- the row will not be returned. `Returning` `Star` will return all columns

386−-- in the row. Use `Returning` `Nil` in the common case where no return

407+-- in the row. Use @Returning Nil@ in the common case where no return

387408-- values are desired.

388409newtype ReturningClause commons schemas params from row =

389− Returning (Selection '[] commons 'Ungrouped schemas params from row)

410+ Returning (Selection '[] 'Ungrouped commons schemas params from row)

390411

391412instance RenderSQL (ReturningClause commons schemas params from row) where

392413 renderSQL = \case

393414 Returning (List Nil) -> ""

394415 Returning selection -> " RETURNING" <+> renderSQL selection

395416

396−-- | `Returning` a `List`

397417pattern Returning_

398418 :: SOP.SListI row

399− => NP (Aliased (Expression '[] commons 'Ungrouped schemas params from)) row

400− -- ^ row of values

419+ => NP (Aliased (Expression '[] 'Ungrouped commons schemas params from)) row

401420 -> ReturningClause commons schemas params from row

402421pattern Returning_ list = Returning (List list)

403422

@@ -410,9 +429,7 @@ data ConflictClause tab commons schemas params table where

410429 OnConflictDoRaise :: ConflictClause tab commons schemas params table

411430 OnConflict

412431 :: ConflictTarget constraints

413− -- ^ conflict target

414432 -> ConflictAction tab commons schemas params columns

415− -- ^ conflict action

416433 -> ConflictClause tab commons schemas params (constraints :=> columns)

417434

418435-- | Render a `ConflictClause`.

@@ -423,17 +440,6 @@ instance SOP.SListI (TableToColumns table)

423440 OnConflict target action -> " ON CONFLICT"

424441 <+> renderSQL target <+> renderSQL action

425442

426−{- |

427−`ConflictAction` specifies an alternative `OnConflict` action.

428−It can be either `DoNothing`, or a `DoUpdate` clause specifying

429−the exact details of the `update` action to be performed in case of a conflict.

430−The `Set` and WHERE `Condition`s in `OnConflict` `DoUpdate` have access to the

431−existing row using the table's name (or an alias), and to rows proposed

432−for insertion using the special @#excluded@ table.

433−`OnConflict` `DoNothing` simply avoids inserting a row as its alternative action.

434−`OnConflict` `DoUpdate` updates the existing row that conflicts

435−with the row proposed for insertion as its alternative action.

436−-}

437443data ConflictAction tab commons schemas params columns where

438444 DoNothing :: ConflictAction tab commons schemas params columns

439445 DoUpdate

@@ -442,9 +448,8 @@ data ConflictAction tab commons schemas params columns where

442448 , columns ~ (col0 ': cols)

443449 , SOP.All (HasIn columns) subcolumns

444450 , AllUnique subcolumns )

445− => NP (Aliased (Optional (Expression '[] commons 'Ungrouped schemas params '[tab ::: row, "excluded" ::: row]))) subcolumns

446− -> [Condition '[] commons 'Ungrouped schemas params '[tab ::: row, "excluded" ::: row]]

447− -- ^ WHERE `Condition`s

451+ => NP (ColumnExpression 'Ungrouped schemas params '[tab ::: row, "excluded" ::: row]) subcolumns

452+ -> [Condition '[] 'Ungrouped commons schemas params '[tab ::: row, "excluded" ::: row]]

448453 -> ConflictAction tab commons schemas params columns

449454

450455instance RenderSQL (ConflictAction tab commons schemas params columns) where

@@ -452,17 +457,11 @@ instance RenderSQL (ConflictAction tab commons schemas params columns) where

452457 DoNothing -> "DO NOTHING"

453458 DoUpdate updates whs'

454459 -> "DO UPDATE SET"

455− <+> renderCommaSeparated renderUpdate updates

460+ <+> renderCommaSeparated renderSQL updates

456461 <> case whs' of

457462 [] -> ""

458463 wh:whs -> " WHERE" <+> renderSQL (foldr (.&&) wh whs)

459464

460−renderUpdate

461− :: (forall x. RenderSQL (expr x))

462− => Aliased (Optional expr) ty

463− -> ByteString

464−renderUpdate (expr `As` col) = renderSQL col <+> "=" <+> renderSQL expr

465−

466465-- | A `ConflictTarget` specifies the constraint violation that triggers a

467466-- `ConflictAction`.

468467data ConflictTarget constraints where

@@ -485,6 +484,7 @@ UPDATE statements

485484update

486485 :: ( SOP.SListI columns

487486 , SOP.SListI row1

487+ , db ~ (commons :=> schemas)

488488 , Has sch schemas schema

489489 , Has tab schema ('Table table)

490490 , row0 ~ TableToRow table

@@ -492,9 +492,9 @@ update

492492 , SOP.All (HasIn columns) subcolumns

493493 , AllUnique subcolumns )

494494 => QualifiedAlias sch tab -- ^ table to update

495− -> NP (Aliased (Optional (Expression '[] '[] 'Ungrouped schemas params '[tab ::: row0]))) subcolumns

495+ -> NP (ColumnExpression 'Ungrouped schemas params '[tab ::: row0]) subcolumns

496496 -- ^ modified values to replace old values

497− -> Condition '[] commons 'Ungrouped schemas params '[tab ::: row0]

497+ -> Condition '[] 'Ungrouped commons schemas params '[tab ::: row0]

498498 -- ^ condition under which to perform update on a row

499499 -> ReturningClause commons schemas params '[tab ::: row0] row1 -- ^ results to return

500500 -> Manipulation commons schemas params row1

@@ -502,13 +502,14 @@ update tab columns wh returning = UnsafeManipulation $

502502 "UPDATE"

503503 <+> renderSQL tab

504504 <+> "SET"

505− <+> renderCommaSeparated renderUpdate columns

505+ <+> renderCommaSeparated renderSQL columns

506506 <+> "WHERE" <+> renderSQL wh

507507 <> renderSQL returning

508508

509509-- | Update a row returning `Nil`.

510510update_

511511 :: ( SOP.SListI columns

512+ , db ~ (commons :=> schemas)

512513 , Has sch schemas schema

513514 , Has tab schema ('Table table)

514515 , row ~ TableToRow table

@@ -516,9 +517,9 @@ update_

516517 , SOP.All (HasIn columns) subcolumns

517518 , AllUnique subcolumns )

518519 => QualifiedAlias sch tab -- ^ table to update

519− -> NP (Aliased (Optional (Expression '[] '[] 'Ungrouped schemas params '[tab ::: row]))) subcolumns

520+ -> NP (ColumnExpression 'Ungrouped schemas params '[tab ::: row]) subcolumns

520521 -- ^ modified values to replace old values

521− -> Condition '[] commons 'Ungrouped schemas params '[tab ::: row]

522+ -> Condition '[] 'Ungrouped commons schemas params '[tab ::: row]

522523 -- ^ condition under which to perform update on a row

523524 -> Manipulation commons schemas params '[]

524525update_ tab columns wh = update tab columns wh (Returning_ Nil)

@@ -527,32 +528,23 @@ update_ tab columns wh = update tab columns wh (Returning_ Nil)

527528DELETE statements

528529-----------------------------------------}

529530

530−-- | Specify additional tables with `Using`

531−-- an `also` list of table expressions, allowing columns

532−-- from other tables to appear in the WHERE condition.

533−-- This is similar to the list of tables that can be specified

534−-- in the FROM Clause of a SELECT statement;

535−-- for example, an alias for the table name can be specified.

536−-- Do not repeat the target table in the `Using` list,

537−-- unless you wish to set up a self-join.

538−-- `NoUsing` if no additional tables are to be used.

539531data UsingClause commons schemas params from where

540532 NoUsing :: UsingClause commons schemas params '[]

541533 Using

542534 :: FromClause '[] commons schemas params from

543− -- ^ what to use

544535 -> UsingClause commons schemas params from

545536

546537-- | Delete rows from a table.

547538deleteFrom

548539 :: ( SOP.SListI row1

540+ , db ~ (commons :=> schemas)

549541 , Has sch schemas schema

550542 , Has tab schema ('Table table)

551543 , row0 ~ TableToRow table

552544 , columns ~ TableToColumns table )

553545 => QualifiedAlias sch tab -- ^ table to delete from

554546 -> UsingClause commons schemas params from

555− -> Condition '[] commons 'Ungrouped schemas params (tab ::: row0 ': from)

547+ -> Condition '[] 'Ungrouped commons schemas params (tab ::: row0 ': from)

556548 -- ^ condition under which to delete a row

557549 -> ReturningClause commons schemas params '[tab ::: row0] row1 -- ^ results to return

558550 -> Manipulation commons schemas params row1

@@ -567,12 +559,27 @@ deleteFrom tab using wh returning = UnsafeManipulation $

567559

568560-- | Delete rows returning `Nil`.

569561deleteFrom_

570− :: ( Has sch schemas schema

562+ :: ( db ~ (commons :=> schemas)

563+ , Has sch schemas schema

571564 , Has tab schema ('Table table)

572565 , row ~ TableToRow table

573566 , columns ~ TableToColumns table )

574567 => QualifiedAlias sch tab -- ^ table to delete from

575− -> Condition '[] commons 'Ungrouped schemas params '[tab ::: row]

568+ -> Condition '[] 'Ungrouped commons schemas params '[tab ::: row]

576569 -- ^ condition under which to delete a row

577570 -> Manipulation commons schemas params '[]

578571deleteFrom_ tab wh = deleteFrom tab NoUsing wh (Returning_ Nil)

572+

573+-- | This has the behaviour of a cartesian product, taking all

574+-- possible combinations between @left@ and @right@ - exactly like a

575+-- `crossJoin`. Used when no `crossJoin` syntax is required but simply

576+-- a comma separated list of tables. Typical case is the `UsingClause`

577+-- of a `deleteFrom` query.

578+also

579+ :: FromClause outer commons schemas params right

580+ -- ^ right

581+ -> FromClause outer commons schemas params left

582+ -- ^ left

583+ -> FromClause outer commons schemas params (Join left right)

584+also right left = UnsafeFromClause $

585+ renderSQL left <> "," <+> renderSQL right

squeal-postgresql/src/Squeal/PostgreSQL/Migration.hs+186−337

@@ -8,13 +8,8 @@ Stability: experimental

88This module defines a `Migration` type to safely

99change the schema of your database over time. Let's see an example!

1010

11−First turn on some extensions.

12−

1311>>> :set -XDataKinds -XOverloadedLabels

1412>>> :set -XOverloadedStrings -XFlexibleContexts -XTypeOperators

15−

16−Next, let's define our `TableType`s.

17−

1813>>> :{

1914type UsersTable =

2015 '[ "pk_users" ::: 'PrimaryKey '["id"] ] :=>

@@ -25,7 +20,7 @@ type UsersTable =

2520

2621>>> :{

2722type EmailsTable =

28− '[ "pk_emails" ::: 'PrimaryKey '["id"]

23+ '[ "pk_emails" ::: 'PrimaryKey '["id"]

2924 , "fk_user_id" ::: 'ForeignKey '["user_id"] "users" '["id"]

3025 ] :=>

3126 '[ "id" ::: 'Def :=> 'NotNull 'PGint4

@@ -34,293 +29,227 @@ type EmailsTable =

3429 ]

3530:}

3631

37−Now we can define some `Migration`s to make our tables.

38−

3932>>> :{

4033let

41− makeUsers :: Migration Definition (Public '[]) '["public" ::: '["users" ::: 'Table UsersTable]]

34+ makeUsers :: Migration IO (Public '[]) '["public" ::: '["users" ::: 'Table UsersTable]]

4235 makeUsers = Migration

4336 { name = "make users table"

44− , up = createTable #users

37+ , up = void . define $

38+ createTable #users

4539 ( serial `as` #id :*

46− notNullable text `as` #name )

40+ (text & notNullable) `as` #name )

4741 ( primaryKey #id `as` #pk_users )

48− , down = dropTable #users

42+ , down = void . define $ dropTable #users

4943 }

5044:}

5145

5246>>> :{

5347let

54− makeEmails :: Migration Definition '["public" ::: '["users" ::: 'Table UsersTable]]

48+ makeEmails :: Migration IO '["public" ::: '["users" ::: 'Table UsersTable]]

5549 '["public" ::: '["users" ::: 'Table UsersTable, "emails" ::: 'Table EmailsTable]]

5650 makeEmails = Migration

5751 { name = "make emails table"

58− , up = createTable #emails

52+ , up = void . define $

53+ createTable #emails

5954 ( serial `as` #id :*

60− notNullable int `as` #user_id :*

61− nullable text `as` #email )

55+ (int & notNullable) `as` #user_id :*

56+ (text & nullable) `as` #email )

6257 ( primaryKey #id `as` #pk_emails :*

6358 foreignKey #user_id #users #id

6459 OnDeleteCascade OnUpdateCascade `as` #fk_user_id )

65− , down = dropTable #emails

60+ , down = void . define $ dropTable #emails

6661 }

6762:}

6863

69−Now that we have a couple migrations we can chain them together into a `Path`.

64+Now that we have a couple migrations we can chain them together.

7065

7166>>> let migrations = makeUsers :>> makeEmails :>> Done

7267

73−Now run the migrations.

68+>>> :{

69+let

70+ numMigrations

71+ :: Has "migrations" schemas MigrationsSchema

72+ => PQ schemas schemas IO ()

73+ numMigrations = do

74+ result <- runQuery (select Star (from (table (#migrations ! #schema_migrations `as` #m))))

75+ num <- ntuples result

76+ liftBase $ print num

77+:}

7478

75−>>> import Control.Monad.IO.Class

7679>>> :{

7780withConnection "host=localhost port=5432 dbname=exampledb" $

7881 manipulate (UnsafeManipulation "SET client_min_messages TO WARNING;")

7982 -- suppress notices

80− & pqThen (liftIO (putStrLn "Migrate"))

8183 & pqThen (migrateUp migrations)

82− & pqThen (liftIO (putStrLn "Rollback"))

84+ & pqThen numMigrations

8385 & pqThen (migrateDown migrations)

86+ & pqThen numMigrations

8487:}

85−Migrate

86−Rollback

87−

88−We can also create a simple executable using `defaultMain`.

89−

90−>>> let main = defaultMain "host=localhost port=5432 dbname=exampledb" migrations

91−

92−>>> withArgs [] main

93−Invalid command: "". Use:

94−migrate to run all available migrations

95−rollback to rollback all available migrations

96−status to display migrations run and migrations left to run

97−

98−>>> withArgs ["status"] main

99−Migrations already run:

100− None

101−Migrations left to run:

102− - make users table

103− - make emails table

104−

105−>>> withArgs ["migrate"] main

106−Migrations already run:

107− - make users table

108− - make emails table

109−Migrations left to run:

110− None

111−

112−>>> withArgs ["rollback"] main

113−Migrations already run:

114− None

115−Migrations left to run:

116− - make users table

117− - make emails table

118−

119−In addition to enabling `Migration`s using pure SQL `Definition`s for

120−the `up` and `down` instructions, you can also perform impure `IO` actions

121−by using a `Migration`s over the `Terminally` `PQ` `IO` category.

88+Row 2

89+Row 0

12290-}

12391

12492{-# LANGUAGE

12593 DataKinds

126− , DeriveGeneric

127− , FlexibleContexts

128− , FlexibleInstances

12994 , GADTs

13095 , LambdaCase

131− , OverloadedLabels

132− , OverloadedStrings

13396 , PolyKinds

134− , QuantifiedConstraints

135− , RankNTypes

97+ , OverloadedLabels

13698 , TypeApplications

99+ , FlexibleContexts

137100 , TypeOperators

138101#-}

139102

140103module Squeal.PostgreSQL.Migration

141104 ( -- * Migration

142105 Migration (..)

143− , Migratory (..)

144− , Terminally (..)

145− , terminally

146− , pureMigration

106+ , migrateUp

107+ , migrateDown

108+ -- * Migration table

147109 , MigrationsTable

148− , defaultMain

110+ , createMigrations

111+ , insertMigration

112+ , deleteMigration

113+ , selectMigration

149114 ) where

150115

151−import Control.Category

152116import Control.Monad

153−import Data.ByteString (ByteString)

154−import Data.Foldable (traverse_)

117+import Control.Monad.Base

118+import Control.Monad.Trans.Control

119+import Generics.SOP (K(..))

155120import Data.Function ((&))

156−import Data.List ((\\))

157121import Data.Text (Text)

158−import Data.Time (UTCTime)

159−import Prelude hiding ((.), id)

160−import System.Environment

161−import UnliftIO (MonadIO (..))

162122

163−import qualified Data.Text.IO as Text (putStrLn)

164−import qualified Generics.SOP as SOP

165−import qualified GHC.Generics as GHC

123+import Squeal.PostgreSQL

166124

167−import Squeal.PostgreSQL.Alias

168−import Squeal.PostgreSQL.Binary

169−import Squeal.PostgreSQL.Definition

170−import Squeal.PostgreSQL.Definition.Table

171−import Squeal.PostgreSQL.Definition.Table.Constraint

172−import Squeal.PostgreSQL.Expression.Comparison

173−import Squeal.PostgreSQL.Expression.Parameter

174−import Squeal.PostgreSQL.Expression.Time

175−import Squeal.PostgreSQL.Expression.Type

176−import Squeal.PostgreSQL.List

177−import Squeal.PostgreSQL.Manipulation

178−import Squeal.PostgreSQL.PQ

179−import Squeal.PostgreSQL.Query

180−import Squeal.PostgreSQL.Schema

181−import Squeal.PostgreSQL.Transaction

182−

183−-- | A `Migration` is a named "isomorphism" over a given category.

184−-- It should contain an inverse pair of `up` and `down`

185−-- instructions and a unique `name`.

186−data Migration p schemas0 schemas1 = Migration

125+-- | A `Migration` should contain an inverse pair of

126+-- `up` and `down` instructions and a unique `name`.

127+data Migration io schemas0 schemas1 = Migration

187128 { name :: Text -- ^ The `name` of a `Migration`.

188129 -- Each `name` in a `Migration` should be unique.

189− , up :: p schemas0 schemas1 -- ^ The `up` instruction of a `Migration`.

190− , down :: p schemas1 schemas0 -- ^ The `down` instruction of a `Migration`.

191− } deriving (GHC.Generic)

192−

193−{- |

194−A `Migratory` @p@ is a `Category` for which one can execute or rewind

195−a `Path` of `Migration`s over @p@. This includes the category of pure

196−SQL `Definition`s and the category of impure `Terminally` `PQ` `IO` actions.

197−-}

198−class Category p => Migratory p where

199−

200− {- |

201− Run a `Path` of `Migration`s.

202− Create the `MigrationsTable` as @public.schema_migrations@ if it does not already exist.

203− In one transaction, for each each `Migration` query to see if the `Migration` has been executed;

204− if not, `up` the `Migration` and insert its `name` in the `MigrationsTable`.

205− -}

206− migrateUp

207− :: Path (Migration p) schemas0 schemas1

208− -> PQ schemas0 schemas1 IO ()

209−

210− {- |

211− Rewind a `Path` of `Migration`s.

212− Create the `MigrationsTable` as @public.schema_migrations@ if it does not already exist.

213− In one transaction, for each each `Migration` query to see if the `Migration` has been executed;

214− if so, `down` the `Migration` and delete its `name` in the `MigrationsTable`.

215− -}

216− migrateDown

217− :: Path (Migration p) schemas0 schemas1

218− -> PQ schemas1 schemas0 IO ()

219−

220−instance Migratory Definition where

221− migrateUp = migrateUp . cmap pureMigration

222− migrateDown = migrateDown . cmap pureMigration

223−

224−{- | `Terminally` turns an indexed monad transformer and the monad it transforms

225−into a category by restricting the return type to @()@ and permuting the type variables.

226−This is similar to how applying a monad to @()@ yields a monoid.

227−Since a `Terminally` action has a trivial return value, the only reason

228−to run one is for the side effects, in particular database and other IO effects.

229−-}

230−newtype Terminally trans monad x0 x1 = Terminally

231− { runTerminally :: trans x0 x1 monad () }

232− deriving GHC.Generic

233−

234−instance

235− ( IndexedMonadTransPQ trans

236− , Monad monad

237− , forall x0 x1. x0 ~ x1 => Monad (trans x0 x1 monad) )

238− => Category (Terminally trans monad) where

239− id = Terminally (return ())

240− Terminally g . Terminally f = Terminally $ pqThen g f

241−

242−-- | `terminally` ignores the output of a computation, returning @()@ and

243−-- wrapping it up into a `Terminally`. You can lift an action in the base monad

244−-- by using @terminally . lift@.

245−terminally

246− :: Functor (trans x0 x1 monad)

247− => trans x0 x1 monad ignore

248− -> Terminally trans monad x0 x1

249−terminally = Terminally . void

250−

251−-- | A `pureMigration` turns a `Migration` involving only pure SQL

252−-- `Definition`s into a `Migration` that may be combined with arbitrary `IO`.

253−pureMigration

254− :: Migration Definition schemas0 schemas1

255− -> Migration (Terminally PQ IO) schemas0 schemas1

256−pureMigration migration = Migration

257− { name = name migration

258− , up = terminally . define $ up migration

259− , down = terminally . define $ down migration

130+ , up :: PQ schemas0 schemas1 io () -- ^ The `up` instruction of a `Migration`.

131+ , down :: PQ schemas1 schemas0 io () -- ^ The `down` instruction of a `Migration`.

260132 }

261133

262−instance Migratory (Terminally PQ IO) where

263−

264− migrateUp migration = unsafePQ . transactionally_ $ do

265− define createMigrations

266− upMigrations migration

267−

268− where

269−

270− upMigrations

271− :: Path (Migration (Terminally PQ IO)) schemas0 schemas1

272− -> PQ MigrationsSchemas MigrationsSchemas IO ()

273− upMigrations = \case

274− Done -> return ()

275− step :>> steps -> upMigration step >> upMigrations steps

276−

277− upMigration

278− :: Migration (Terminally PQ IO) schemas0 schemas1

279− -> PQ MigrationsSchemas MigrationsSchemas IO ()

280− upMigration step = do

281− executed <- queryExecuted step

282− unless (executed == 1) $ do

283− unsafePQ . runTerminally $ up step

284− manipulateParams_ insertMigration (Only (name step))

285−

286− queryExecuted

287− :: Migration (Terminally PQ IO) schemas0 schemas1

288− -> PQ MigrationsSchemas MigrationsSchemas IO Row

289− queryExecuted step = do

290− result <- runQueryParams selectMigration (Only (name step))

291− ntuples result

292−

293− migrateDown migrations = unsafePQ . transactionally_ $ do

294− define createMigrations

295− downMigrations migrations

296−

297− where

298−

299− downMigrations

300− :: Path (Migration (Terminally PQ IO)) schemas0 schemas1

301− -> PQ MigrationsSchemas MigrationsSchemas IO ()

302− downMigrations = \case

303− Done -> return ()

304− step :>> steps -> downMigrations steps >> downMigration step

305−

306− downMigration

307− :: Migration (Terminally PQ IO) schemas0 schemas1

308− -> PQ MigrationsSchemas MigrationsSchemas IO ()

309− downMigration step = do

310− executed <- queryExecuted step

311− unless (executed == 0) $ do

312− unsafePQ . runTerminally $ down step

313− manipulateParams_ deleteMigration (Only (name step))

134+-- | Run `Migration`s by creating the `MigrationsTable`

135+-- if it does not exist and then in a transaction, for each each `Migration`

136+-- query to see if the `Migration` is executed. If not, then

137+-- execute the `Migration` and insert its row in the `MigrationsTable`.

138+migrateUp

139+ :: MonadBaseControl IO io

140+ => AlignedList (Migration io) schemas0 schemas1 -- ^ migrations to run

141+ -> PQ

142+ ("migrations" ::: MigrationsSchema ': schemas0)

143+ ("migrations" ::: MigrationsSchema ': schemas1)

144+ io ()

145+migrateUp migration =

146+ define createMigrations

147+ & pqBind okResult

148+ & pqThen (transactionallySchema_ (upMigrations migration))

149+ where

314150

315− queryExecuted

316− :: Migration (Terminally PQ IO) schemas0 schemas1

317− -> PQ MigrationsSchemas MigrationsSchemas IO Row

318− queryExecuted step = do

319− result <- runQueryParams selectMigration (Only (name step))

320− ntuples result

151+ upMigrations

152+ :: MonadBaseControl IO io

153+ => AlignedList (Migration io) schemas0 schemas1

154+ -> PQ

155+ ("migrations" ::: MigrationsSchema ': schemas0)

156+ ("migrations" ::: MigrationsSchema ': schemas1)

157+ io ()

158+ upMigrations = \case

159+ Done -> return ()

160+ step :>> steps -> upMigration step & pqThen (upMigrations steps)

161+

162+ upMigration

163+ :: MonadBase IO io

164+ => Migration io schemas0 schemas1 -> PQ

165+ ("migrations" ::: MigrationsSchema ': schemas0)

166+ ("migrations" ::: MigrationsSchema ': schemas1)

167+ io ()

168+ upMigration step =

169+ queryExecuted step

170+ & pqBind (\ executed ->

171+ if executed == 1 -- up step has already been executed

172+ then PQ (\ _ -> return (K ())) -- unsafely switch schemas

173+ else

174+ pqEmbed (up step) -- safely switch schemas

175+ & pqThen (manipulateParams insertMigration (Only (name step)))

176+ -- insert execution record

177+ & pqBind okResult)

178+

179+ queryExecuted

180+ :: MonadBase IO io

181+ => Migration io schemas0 schemas1 -> PQ

182+ ("migrations" ::: MigrationsSchema ': schemas0)

183+ ("migrations" ::: MigrationsSchema ': schemas0)

184+ io Row

185+ queryExecuted step = do

186+ result <- runQueryParams selectMigration (Only (name step))

187+ okResult result

188+ ntuples result

189+

190+-- | Rewind `Migration`s by creating the `MigrationsTable`

191+-- if it does not exist and then in a transaction, for each each `Migration`

192+-- query to see if the `Migration` is executed. If it is, then

193+-- rewind the `Migration` and delete its row in the `MigrationsTable`.

194+migrateDown

195+ :: MonadBaseControl IO io

196+ => AlignedList (Migration io) schemas0 schemas1 -- ^ migrations to rewind

197+ -> PQ

198+ ("migrations" ::: MigrationsSchema ': schemas1)

199+ ("migrations" ::: MigrationsSchema ': schemas0)

200+ io ()

201+migrateDown migrations =

202+ define createMigrations

203+ & pqBind okResult

204+ & pqThen (transactionallySchema_ (downMigrations migrations))

205+ where

321206

322−unsafePQ :: (Functor m) => PQ db0 db1 m x -> PQ db0' db1' m x

323−unsafePQ (PQ pq) = PQ $ fmap (SOP.K . SOP.unK) . pq . SOP.K . SOP.unK

207+ downMigrations

208+ :: MonadBaseControl IO io

209+ => AlignedList (Migration io) schemas0 schemas1 -> PQ

210+ ("migrations" ::: MigrationsSchema ': schemas1)

211+ ("migrations" ::: MigrationsSchema ': schemas0)

212+ io ()

213+ downMigrations = \case

214+ Done -> return ()

215+ step :>> steps -> downMigrations steps & pqThen (downMigration step)

216+

217+ downMigration

218+ :: MonadBase IO io

219+ => Migration io schemas0 schemas1 -> PQ

220+ ("migrations" ::: MigrationsSchema ': schemas1)

221+ ("migrations" ::: MigrationsSchema ': schemas0)

222+ io ()

223+ downMigration step =

224+ queryExecuted step

225+ & pqBind (\ executed ->

226+ if executed == 0 -- up step has not been executed

227+ then PQ (\ _ -> return (K ())) -- unsafely switch schemas

228+ else

229+ pqEmbed (down step) -- safely switch schemas

230+ & pqThen (manipulateParams deleteMigration (Only (name step)))

231+ -- delete execution record

232+ & pqBind okResult)

233+

234+ queryExecuted

235+ :: MonadBase IO io

236+ => Migration io schemas0 schemas1 -> PQ

237+ ("migrations" ::: MigrationsSchema ': schemas1)

238+ ("migrations" ::: MigrationsSchema ': schemas1)

239+ io Row

240+ queryExecuted step = do

241+ result <- runQueryParams selectMigration (Only (name step))

242+ okResult result

243+ ntuples result

244+

245+okResult :: MonadBase IO io => K Result results -> PQ schema schema io ()

246+okResult result = do

247+ status <- resultStatus result

248+ when (not (status `elem` [CommandOk, TuplesOk])) $ do

249+ errorMessageMaybe <- resultErrorMessage result

250+ case errorMessageMaybe of

251+ Nothing -> error "migrateDown: unknown error"

252+ Just msg -> error ("migrationDown: " <> show msg)

324253

325254-- | The `TableType` for a Squeal migration.

326255type MigrationsTable =

@@ -329,120 +258,40 @@ type MigrationsTable =

329258 , "executed_at" ::: 'Def :=> 'NotNull 'PGtimestamptz

330259 ]

331260

332−data MigrationRow =

333− MigrationRow { migrationName :: Text

334− , migrationTime :: UTCTime }

335− deriving (GHC.Generic, Show)

336−

337−instance SOP.Generic MigrationRow

338−instance SOP.HasDatatypeInfo MigrationRow

339−

340261type MigrationsSchema = '["schema_migrations" ::: 'Table MigrationsTable]

341−type MigrationsSchemas = Public MigrationsSchema

342262

343263-- | Creates a `MigrationsTable` if it does not already exist.

344−createMigrations :: Definition MigrationsSchemas MigrationsSchemas

264+createMigrations

265+ :: Has "migrations" schemas MigrationsSchema

266+ => Definition schemas schemas

345267createMigrations =

346− createTableIfNotExists #schema_migrations

268+ createSchemaIfNotExists #migrations >>>

269+ createTableIfNotExists (#migrations ! #schema_migrations)

347270 ( (text & notNullable) `as` #name :*

348271 (timestampWithTimeZone & notNullable & default_ currentTimestamp)

349272 `as` #executed_at )

350273 ( unique #name `as` #migrations_unique_name )

351274

352−-- | Inserts a `Migration` into the `MigrationsTable`, returning

353−-- the time at which it was inserted.

354−insertMigration :: Manipulation_ MigrationsSchemas (Only Text) ()

355−insertMigration = insertInto_ #schema_migrations

356− (Values_ (Set (param @1) `as` #name :* Default `as` #executed_at))

275+-- | Inserts a `Migration` into the `MigrationsTable`

276+insertMigration

277+ :: Has "migrations" schemas MigrationsSchema

278+ => Manipulation '[] schemas '[ 'NotNull 'PGtext] '[]

279+insertMigration = insertInto_ (#migrations ! #schema_migrations) . Values_ $

280+ (param @1) `as` #name :* defaultAs #executed_at

357281

358−-- | Deletes a `Migration` from the `MigrationsTable`, returning

359−-- the time at which it was inserted.

360−deleteMigration :: Manipulation_ MigrationsSchemas (Only Text) ()

361−deleteMigration = deleteFrom_ #schema_migrations (#name .== param @1)

282+-- | Deletes a `Migration` from the `MigrationsTable`

283+deleteMigration

284+ :: Has "migrations" schemas MigrationsSchema

285+ => Manipulation '[] schemas '[ 'NotNull 'PGtext ] '[]

286+deleteMigration = deleteFrom_ (#migrations ! #schema_migrations) (#name .== param @1)

362287

363288-- | Selects a `Migration` from the `MigrationsTable`, returning

364−-- the time at which it was inserted.

289+-- the time at which it was executed.

365290selectMigration

366− :: Query_ MigrationsSchemas (Only Text) (Only UTCTime)

367−selectMigration = select_ (#executed_at `as` #fromOnly)

368− $ from (table (#schema_migrations))

369− & where_ (#name .== param @1)

370−

371−selectMigrations :: Query_ MigrationsSchemas () MigrationRow

372−selectMigrations = select_

373− (#name `as` #migrationName :* #executed_at `as` #migrationTime)

374− (from (table #schema_migrations))

375−

376−data MigrateCommand

377− = MigrateStatus

378− | MigrateUp

379− | MigrateDown deriving (GHC.Generic, Show)

380−

381−{- | `defaultMain` creates a simple executable

382−from a connection string and a list of `Migration`s. -}

383−defaultMain

384− :: Migratory p

385− => ByteString

386− -- ^ connection string

387− -> Path (Migration p) db0 db1

388− -- ^ migrations

389− -> IO ()

390−defaultMain connectTo migrations = do

391− command <- readCommandFromArgs

392− maybe (pure ()) performCommand command

393−

394− where

395−

396− performCommand :: MigrateCommand -> IO ()

397− performCommand = \case

398− MigrateStatus -> withConnection connectTo $

399− suppressNotices >> migrateStatus

400− MigrateUp -> withConnection connectTo $

401− suppressNotices & pqThen (migrateUp migrations) & pqThen migrateStatus

402− MigrateDown -> withConnection connectTo $

403− suppressNotices & pqThen (migrateDown migrations) & pqThen migrateStatus

404−

405− migrateStatus :: PQ schema schema IO ()

406− migrateStatus = unsafePQ $ do

407− runNames <- getRunMigrationNames

408− let names = ctoList name migrations

409− unrunNames = names \\ runNames

410− liftIO $ displayRunned runNames >> displayUnrunned unrunNames

411−

412− suppressNotices :: PQ schema schema IO ()

413− suppressNotices = manipulate_ $

414− UnsafeManipulation "SET client_min_messages TO WARNING;"

415−

416− readCommandFromArgs :: IO (Maybe MigrateCommand)

417− readCommandFromArgs = getArgs >>= \case

418− ["migrate"] -> pure . Just $ MigrateUp

419− ["rollback"] -> pure . Just $ MigrateDown

420− ["status"] -> pure . Just $ MigrateStatus

421− args -> displayUsage args >> pure Nothing

422−

423− displayUsage :: [String] -> IO ()

424− displayUsage args = do

425− putStrLn $ "Invalid command: \"" <> unwords args <> "\". Use:"

426− putStrLn "migrate to run all available migrations"

427− putStrLn "rollback to rollback all available migrations"

428− putStrLn "status to display migrations run and migrations left to run"

429−

430− getRunMigrationNames :: (MonadIO m) => PQ db0 db0 m [Text]

431− getRunMigrationNames =

432− fmap migrationName <$> (unsafePQ (define createMigrations & pqThen (runQuery selectMigrations)) >>= getRows)

433−

434− displayListOfNames :: [Text] -> IO ()

435− displayListOfNames [] = Text.putStrLn " None"

436− displayListOfNames xs =

437− let singleName n = Text.putStrLn $ " - " <> n

438− in traverse_ singleName xs

439−

440− displayUnrunned :: [Text] -> IO ()

441− displayUnrunned unrunned =

442− Text.putStrLn "Migrations left to run:"

443− >> displayListOfNames unrunned

444−

445− displayRunned :: [Text] -> IO ()

446− displayRunned runned =

447− Text.putStrLn "Migrations already run:"

448− >> displayListOfNames runned

291+ :: Has "migrations" schemas MigrationsSchema

292+ => Query '[] '[] schemas '[ 'NotNull 'PGtext ]

293+ '[ "executed_at" ::: 'NotNull 'PGtimestamptz ]

294+selectMigration = select_

295+ (#executed_at `as` #executed_at)

296+ ( from (table ((#migrations ! #schema_migrations) `as` #m))

297+ & where_ (#name .== param @1))

squeal-postgresql/src/Squeal/PostgreSQL/PG.hsdeleted−388

@@ -1,388 +0,0 @@

1−{-|

2−Module: Squeal.PostgreSQL.PG

3−Description: Embedding of Haskell types into Postgres's type system

4−Copyright: (c) Eitan Chatav, 2010

5−Maintainer: eitan@morphism.tech

6−Stability: experimental

7−

8−`Squeal.PostgreSQL.PG` provides type families for turning Haskell

9−`Type`s into corresponding Postgres types.

10−-}

11−{-# LANGUAGE

12− AllowAmbiguousTypes

13− , DeriveAnyClass

14− , DeriveFoldable

15− , DeriveFunctor

16− , DeriveGeneric

17− , DeriveTraversable

18− , DerivingStrategies

19− , DefaultSignatures

20− , FlexibleContexts

21− , FlexibleInstances

22− , FunctionalDependencies

23− , GADTs

24− , LambdaCase

25− , MultiParamTypeClasses

26− , OverloadedStrings

27− , ScopedTypeVariables

28− , TypeApplications

29− , TypeFamilies

30− , TypeInType

31− , TypeOperators

32− , UndecidableInstances

33− , UndecidableSuperClasses

34−#-}

35−

36−module Squeal.PostgreSQL.PG

37− ( -- * PG embeddings

38− PG

39− , NullPG

40− , TuplePG

41− , RowPG

42− -- * Storage newtypes

43− , Money (..)

44− , Json (..)

45− , Jsonb (..)

46− , Composite (..)

47− , Enumerated (..)

48− , VarArray (..)

49− , FixArray (..)

50− , LibPQ.Oid (..)

51− -- * Type families

52− , LabelsPG

53− , DimPG

54− , FixPG

55− , TupleOf

56− , TupleCodeOf

57− , RowOf

58− , ConstructorsOf

59− , ConstructorNameOf

60− , ConstructorNamesOf

61− ) where

62−

63−import Data.Aeson (Value)

64−import Data.Kind (Type)

65−import Data.Int (Int16, Int32, Int64)

66−import Data.Scientific (Scientific)

67−import Data.Time (Day, DiffTime, LocalTime, TimeOfDay, TimeZone, UTCTime)

68−import Data.Vector (Vector)

69−import Data.UUID.Types (UUID)

70−import GHC.TypeLits

71−import Network.IP.Addr (NetAddr, IP)

72−

73−import qualified Data.ByteString.Lazy as Lazy (ByteString)

74−import qualified Data.ByteString as Strict (ByteString)

75−import qualified Data.Text.Lazy as Lazy (Text)

76−import qualified Data.Text as Strict (Text)

77−import qualified Database.PostgreSQL.LibPQ as LibPQ

78−import qualified GHC.Generics as GHC

79−import qualified Generics.SOP as SOP

80−import qualified Generics.SOP.Record as SOP

81−import qualified Generics.SOP.Type.Metadata as Type

82−

83−import Squeal.PostgreSQL.Alias

84−import Squeal.PostgreSQL.Schema

85−

86−-- $setup

87−-- >>> import Squeal.PostgreSQL

88−-- >>> import Data.Text (Text)

89−

90−{- | The `PG` type family embeds a subset of Haskell types

91−as Postgres types. As an open type family, `PG` is extensible.

92−

93−>>> :kind! PG LocalTime

94−PG LocalTime :: PGType

95−= 'PGtimestamp

96−

97−>>> newtype MyDouble = My Double

98−>>> :set -XTypeFamilies

99−>>> type instance PG MyDouble = 'PGfloat8

100−-}

101−type family PG (hask :: Type) :: PGType

102−-- | `PGbool`

103−type instance PG Bool = 'PGbool

104−-- | `PGint2`

105−type instance PG Int16 = 'PGint2

106−-- | `PGint4`

107−type instance PG Int32 = 'PGint4

108−-- | `PGint8`

109−type instance PG Int64 = 'PGint8

110−-- | `PGint2`

111−type instance PG LibPQ.Oid = 'PGoid

112−-- | `PGnumeric`

113−type instance PG Scientific = 'PGnumeric

114−-- | `PGfloat4`

115−type instance PG Float = 'PGfloat4

116−-- | `PGfloat8`

117−type instance PG Double = 'PGfloat8

118−-- | `PGchar` @1@

119−type instance PG Char = 'PGchar 1

120−-- | `PGtext`

121−type instance PG Strict.Text = 'PGtext

122−-- | `PGtext`

123−type instance PG Lazy.Text = 'PGtext

124−-- | `PGtext`

125−type instance PG String = 'PGtext

126−-- | `PGbytea`

127−type instance PG Strict.ByteString = 'PGbytea

128−-- | `PGbytea`

129−type instance PG Lazy.ByteString = 'PGbytea

130−-- | `PGtimestamp`

131−type instance PG LocalTime = 'PGtimestamp

132−-- | `PGtimestamptz`

133−type instance PG UTCTime = 'PGtimestamptz

134−-- | `PGdate`

135−type instance PG Day = 'PGdate

136−-- | `PGtime`

137−type instance PG TimeOfDay = 'PGtime

138−-- | `PGtimetz`

139−type instance PG (TimeOfDay, TimeZone) = 'PGtimetz

140−-- | `PGinterval`

141−type instance PG DiffTime = 'PGinterval

142−-- | `PGuuid`

143−type instance PG UUID = 'PGuuid

144−-- | `PGinet`

145−type instance PG (NetAddr IP) = 'PGinet

146−-- | `PGjson`

147−type instance PG Value = 'PGjson

148−

149−{-| The `LabelsPG` type family calculates the constructors of a

150−Haskell enum type.

151−

152−>>> data Schwarma = Beef | Lamb | Chicken deriving GHC.Generic

153−>>> instance SOP.Generic Schwarma

154−>>> instance SOP.HasDatatypeInfo Schwarma

155−>>> :kind! LabelsPG Schwarma

156−LabelsPG Schwarma :: [Type.ConstructorName]

157−= '["Beef", "Lamb", "Chicken"]

158−-}

159−type family LabelsPG (hask :: Type) :: [Type.ConstructorName] where

160− LabelsPG hask =

161− ConstructorNamesOf (ConstructorsOf (SOP.DatatypeInfoOf hask))

162−

163−{- |

164−`RowPG` turns a Haskell `Type` into a `RowType`.

165−

166−`RowPG` may be applied to normal Haskell record types provided they

167−have `SOP.Generic` and `SOP.HasDatatypeInfo` instances;

168−

169−>>> data Person = Person { name :: Strict.Text, age :: Int32 } deriving GHC.Generic

170−>>> instance SOP.Generic Person

171−>>> instance SOP.HasDatatypeInfo Person

172−>>> :kind! RowPG Person

173−RowPG Person :: [(Symbol, NullityType)]

174−= '["name" ::: 'NotNull 'PGtext, "age" ::: 'NotNull 'PGint4]

175−-}

176−type family RowPG (hask :: Type) :: RowType where

177− RowPG hask = RowOf (SOP.RecordCodeOf hask)

178−

179−-- | `RowOf` applies `NullPG` to the fields of a list.

180−type family RowOf (record :: [(Symbol, Type)]) :: RowType where

181− RowOf (col ::: ty ': col1 ::: ty1 ': col2 ::: ty2 ': col3 ::: ty3 ': col4 ::: ty4 ': record) =

182− col ::: NullPG ty ': col1 ::: NullPG ty1 ': col2 ::: NullPG ty2 ': col3 ::: NullPG ty3 ': col4 ::: NullPG ty4 ': RowOf record

183− RowOf (col ::: ty ': col1 ::: ty1 ': col2 ::: ty2 ': col3 ::: ty3 ': record) =

184− col ::: NullPG ty ': col1 ::: NullPG ty1 ': col2 ::: NullPG ty2 ': col3 ::: NullPG ty3 ': RowOf record

185− RowOf (col ::: ty ': col1 ::: ty1 ': col2 ::: ty2 ': record) =

186− col ::: NullPG ty ': col1 ::: NullPG ty1 ': col2 ::: NullPG ty2 ': RowOf record

187− RowOf (col ::: ty ': col1 ::: ty1 ': record) =

188− col ::: NullPG ty ': col1::: NullPG ty1 ': RowOf record

189− RowOf (col ::: ty ': record) = col ::: NullPG ty ': RowOf record

190− RowOf '[] = '[]

191−

192−{- | `NullPG` turns a Haskell type into a `NullityType`.

193−

194−>>> :kind! NullPG Double

195−NullPG Double :: NullityType

196−= 'NotNull 'PGfloat8

197−>>> :kind! NullPG (Maybe Double)

198−NullPG (Maybe Double) :: NullityType

199−= 'Null 'PGfloat8

200−-}

201−type family NullPG (hask :: Type) :: NullityType where

202− NullPG (Maybe hask) = 'Null (PG hask)

203− NullPG hask = 'NotNull (PG hask)

204−

205−{- | `TuplePG` turns a Haskell tuple type (including record types) into

206−the corresponding list of `NullityType`s.

207−

208−>>> :kind! TuplePG (Double, Maybe Char)

209−TuplePG (Double, Maybe Char) :: [NullityType]

210−= '[ 'NotNull 'PGfloat8, 'Null ('PGchar 1)]

211−-}

212−type family TuplePG (hask :: Type) :: [NullityType] where

213− TuplePG hask = TupleOf (TupleCodeOf hask (SOP.Code hask))

214−

215−-- | `TupleOf` turns a list of Haskell `Type`s into a list of `NullityType`s.

216−type family TupleOf (tuple :: [Type]) :: [NullityType] where

217− TupleOf (hask ': hask1 ': hask2 ': hask3 ': hask4 ': hask5 ': tuple) =

218− NullPG hask ': NullPG hask1 ': NullPG hask2 ': NullPG hask3 ': NullPG hask4 ': NullPG hask5 ': TupleOf tuple

219− TupleOf (hask ': hask1 ': hask2 ': hask3 ': hask4 ': tuple) =

220− NullPG hask ': NullPG hask1 ': NullPG hask2 ': NullPG hask3 ': NullPG hask4 ': TupleOf tuple

221− TupleOf (hask ': hask1 ': hask2 ': hask3 ': tuple) =

222− NullPG hask ': NullPG hask1 ': NullPG hask2 ': NullPG hask3 ': TupleOf tuple

223− TupleOf (hask ': hask1 ': hask2 ': tuple) =

224− NullPG hask ': NullPG hask1 ': NullPG hask2 ': TupleOf tuple

225− TupleOf (hask ': hask1 ': tuple) = NullPG hask ': NullPG hask1 ': TupleOf tuple

226− TupleOf (hask ': tuple) = NullPG hask ': TupleOf tuple

227− TupleOf '[] = '[]

228−

229−-- | `TupleCodeOf` takes the `SOP.Code` of a haskell `Type`

230−-- and if it's a simple product returns it, otherwise giving a `TypeError`.

231−type family TupleCodeOf (hask :: Type) (code :: [[Type]]) :: [Type] where

232− TupleCodeOf hask '[tuple] = tuple

233− TupleCodeOf hask '[] =

234− TypeError

235− ( 'Text "The type `" ':<>: 'ShowType hask ':<>: 'Text "' is not a tuple type."

236− ':$$: 'Text "It is a void type with no constructors."

237− )

238− TupleCodeOf hask (_ ': _ ': _) =

239− TypeError

240− ( 'Text "The type `" ':<>: 'ShowType hask ':<>: 'Text "' is not a tuple type."

241− ':$$: 'Text "It is a sum type with more than one constructor."

242− )

243−

244−-- | Calculates constructors of a datatype.

245−type family ConstructorsOf (datatype :: Type.DatatypeInfo)

246− :: [Type.ConstructorInfo] where

247− ConstructorsOf ('Type.ADT _module _datatype constructors) =

248− constructors

249− ConstructorsOf ('Type.Newtype _module _datatype constructor) =

250− '[constructor]

251−

252−-- | Calculates the name of a nullary constructor, otherwise

253−-- generates a type error.

254−type family ConstructorNameOf (constructor :: Type.ConstructorInfo)

255− :: Type.ConstructorName where

256− ConstructorNameOf ('Type.Constructor name) = name

257− ConstructorNameOf ('Type.Infix name _assoc _fix) = TypeError

258− ('Text "ConstructorNameOf error: non-nullary constructor "

259− ':<>: 'Text name)

260− ConstructorNameOf ('Type.Record name _fields) = TypeError

261− ('Text "ConstructorNameOf error: non-nullary constructor "

262− ':<>: 'Text name)

263−

264−-- | Calculate the names of nullary constructors.

265−type family ConstructorNamesOf (constructors :: [Type.ConstructorInfo])

266− :: [Type.ConstructorName] where

267− ConstructorNamesOf '[] = '[]

268− ConstructorNamesOf (constructor ': constructors) =

269− ConstructorNameOf constructor ': ConstructorNamesOf constructors

270−

271−-- | `DimPG` turns Haskell nested homogeneous tuples into a list of lengths.

272−type family DimPG (hask :: Type) :: [Nat] where

273− DimPG (x,x) = 2 ': DimPG x

274− DimPG (x,x,x) = 3 ': DimPG x

275− DimPG (x,x,x,x) = 4 ': DimPG x

276− DimPG (x,x,x,x,x) = 5 ': DimPG x

277− DimPG (x,x,x,x,x,x) = 6 ': DimPG x

278− DimPG (x,x,x,x,x,x,x) = 7 ': DimPG x

279− DimPG (x,x,x,x,x,x,x,x) = 8 ': DimPG x

280− DimPG (x,x,x,x,x,x,x,x,x) = 9 ': DimPG x

281− DimPG (x,x,x,x,x,x,x,x,x,x) = 10 ': DimPG x

282− DimPG x = '[]

283−

284−-- | `FixPG` extracts `NullPG` of the base type of nested homogeneous tuples.

285−type family FixPG (hask :: Type) :: NullityType where

286− FixPG (x,x) = FixPG x

287− FixPG (x,x,x) = FixPG x

288− FixPG (x,x,x,x) = FixPG x

289− FixPG (x,x,x,x,x) = FixPG x

290− FixPG (x,x,x,x,x,x) = FixPG x

291− FixPG (x,x,x,x,x,x,x) = FixPG x

292− FixPG (x,x,x,x,x,x,x,x) = FixPG x

293− FixPG (x,x,x,x,x,x,x,x,x) = FixPG x

294− FixPG (x,x,x,x,x,x,x,x,x,x) = FixPG x

295− FixPG (x,x,x,x,x,x,x,x,x,x,x) = FixPG x

296− FixPG x = NullPG x

297−

298−{- | The `Money` newtype stores a monetary value in terms

299−of the number of cents, i.e. @$2,000.20@ would be expressed as

300−@Money { cents = 200020 }@.

301−

302−>>> import Control.Monad (void)

303−>>> import Control.Monad.IO.Class (liftIO)

304−>>> import Squeal.PostgreSQL

305−>>> :{

306−let

307− roundTrip :: Query_ (Public '[]) (Only Money) (Only Money)

308− roundTrip = values_ $ parameter @1 money `as` #fromOnly

309−:}

310−

311−>>> let input = Only (Money 20020)

312−

313−>>> :{

314−withConnection "host=localhost port=5432 dbname=exampledb" $ do

315− result <- runQueryParams roundTrip input

316− Just output <- firstRow result

317− liftIO . print $ input == output

318−:}

319−True

320−-}

321−newtype Money = Money { cents :: Int64 }

322− deriving stock (Eq, Ord, Show, Read, GHC.Generic)

323− deriving anyclass (SOP.HasDatatypeInfo, SOP.Generic)

324−-- | `PGmoney`

325−type instance PG Money = 'PGmoney

326−

327−{- | The `Json` newtype is an indication that the Haskell

328−type it's applied to should be stored as a `PGjson`.

329−-}

330−newtype Json hask = Json {getJson :: hask}

331− deriving stock (Eq, Ord, Show, Read, GHC.Generic)

332− deriving anyclass (SOP.HasDatatypeInfo, SOP.Generic)

333−-- | `PGjson`

334−type instance PG (Json hask) = 'PGjson

335−

336−{- | The `Jsonb` newtype is an indication that the Haskell

337−type it's applied to should be stored as a `PGjsonb`.

338−-}

339−newtype Jsonb hask = Jsonb {getJsonb :: hask}

340− deriving stock (Eq, Ord, Show, Read, GHC.Generic)

341− deriving anyclass (SOP.HasDatatypeInfo, SOP.Generic)

342−-- | `PGjsonb`

343−type instance PG (Jsonb hask) = 'PGjsonb

344−

345−{- | The `Composite` newtype is an indication that the Haskell

346−type it's applied to should be stored as a `PGcomposite`.

347−-}

348−newtype Composite record = Composite {getComposite :: record}

349− deriving stock (Eq, Ord, Show, Read, GHC.Generic)

350− deriving anyclass (SOP.HasDatatypeInfo, SOP.Generic)

351−-- | `PGcomposite` @(@`RowPG` @hask)@

352−type instance PG (Composite hask) = 'PGcomposite (RowPG hask)

353−

354−{- | The `Enumerated` newtype is an indication that the Haskell

355−type it's applied to should be stored as a `PGenum`.

356−-}

357−newtype Enumerated enum = Enumerated {getEnumerated :: enum}

358− deriving stock (Eq, Ord, Show, Read, GHC.Generic)

359− deriving anyclass (SOP.HasDatatypeInfo, SOP.Generic)

360−-- | `PGenum` @(@`LabelsPG` @hask)@

361−type instance PG (Enumerated hask) = 'PGenum (LabelsPG hask)

362−

363−{- | The `VarArray` newtype is an indication that the Haskell

364−type it's applied to should be stored as a `PGvararray`.

365−

366−>>> :kind! PG (VarArray (Vector Double))

367−PG (VarArray (Vector Double)) :: PGType

368−= 'PGvararray ('NotNull 'PGfloat8)

369−-}

370−newtype VarArray arr = VarArray {getVarArray :: arr}

371− deriving stock (Eq, Ord, Show, Read, GHC.Generic)

372− deriving anyclass (SOP.HasDatatypeInfo, SOP.Generic)

373−-- | `PGvararray` @(@`NullPG` @hask)@

374−type instance PG (VarArray (Vector hask)) = 'PGvararray (NullPG hask)

375−type instance PG (VarArray [hask]) = 'PGvararray (NullPG hask)

376−

377−{- | The `FixArray` newtype is an indication that the Haskell

378−type it's applied to should be stored as a `PGfixarray`.

379−

380−>>> :kind! PG (FixArray ((Double, Double), (Double, Double)))

381−PG (FixArray ((Double, Double), (Double, Double))) :: PGType

382−= 'PGfixarray '[2, 2] ('NotNull 'PGfloat8)

383−-}

384−newtype FixArray arr = FixArray {getFixArray :: arr}

385− deriving stock (Eq, Ord, Show, Read, GHC.Generic)

386− deriving anyclass (SOP.HasDatatypeInfo, SOP.Generic)

387−-- | `PGfixarray` @(@`DimPG` @hask) (@`FixPG` @hask)@

388−type instance PG (FixArray hask) = 'PGfixarray (DimPG hask) (FixPG hask)

squeal-postgresql/src/Squeal/PostgreSQL/PQ.hs+103−138

@@ -24,7 +24,6 @@ of executing Squeal commands.

2424 , FunctionalDependencies

2525 , FlexibleContexts

2626 , FlexibleInstances

27− , InstanceSigs

2827 , OverloadedStrings

2928 , RankNTypes

3029 , ScopedTypeVariables

@@ -49,6 +48,8 @@ module Squeal.PostgreSQL.PQ

4948 , evalPQ

5049 , IndexedMonadTransPQ (..)

5150 , MonadPQ (..)

51+ , PQRun

52+ , pqliftWith

5253 -- * Results

5354 , LibPQ.Result

5455 , LibPQ.Row

@@ -64,21 +65,18 @@ module Squeal.PostgreSQL.PQ

6465 , resultErrorCode

6566 -- * Exceptions

6667 , SquealException (..)

67− , PQState (..)

68− , okResult

6968 , catchSqueal

7069 , handleSqueal

71− , trySqueal

7270 ) where

7371

74−import Control.Exception (Exception, throw)

72+import Control.Exception.Lifted

73+import Control.Monad.Base

7574import Control.Monad.Except

7675import Control.Monad.Morph

77−import UnliftIO (MonadUnliftIO (..), bracket, catch, handle, try)

76+import Control.Monad.Trans.Control

7877import Data.ByteString (ByteString)

7978import Data.Foldable

8079import Data.Function ((&))

81−import Data.Functor ((<&>))

8280import Data.Kind

8381import Data.Text (pack, Text)

8482import Data.Traversable

@@ -87,7 +85,6 @@ import PostgreSQL.Binary.Encoding (encodingBytes)

8785

8886import qualified Control.Monad.Fail as Fail

8987import qualified Database.PostgreSQL.LibPQ as LibPQ

90−import qualified PostgreSQL.Binary.Encoding as Encoding

9188

9289import Squeal.PostgreSQL.Binary

9390import Squeal.PostgreSQL.Definition

@@ -108,9 +105,6 @@ import qualified Control.Monad.Trans.Writer.Strict as Strict

108105import qualified Control.Monad.Trans.RWS.Lazy as Lazy

109106import qualified Control.Monad.Trans.RWS.Strict as Strict

110107

111−-- $setup

112−-- >>> import Squeal.PostgreSQL

113−

114108{- | Makes a new connection to the database server.

115109

116110This function opens a new database connection using the parameters taken

@@ -138,19 +132,19 @@ with the wrong schema!

138132-}

139133connectdb

140134 :: forall schemas io

141− . MonadIO io

135+ . MonadBase IO io

142136 => ByteString -- ^ conninfo

143137 -> io (K LibPQ.Connection schemas)

144−connectdb = fmap K . liftIO . LibPQ.connectdb

138+connectdb = fmap K . liftBase . LibPQ.connectdb

145139

146140-- | Closes the connection to the server.

147−finish :: MonadIO io => K LibPQ.Connection schemas -> io ()

148−finish = liftIO . LibPQ.finish . unK

141+finish :: MonadBase IO io => K LibPQ.Connection schemas -> io ()

142+finish = liftBase . LibPQ.finish . unK

149143

150144-- | Do `connectdb` and `finish` before and after a computation.

151145withConnection

152146 :: forall schemas0 schemas1 io x

153− . MonadUnliftIO io

147+ . MonadBaseControl IO io

154148 => ByteString

155149 -> PQ schemas0 schemas1 io x

156150 -> io x

@@ -208,7 +202,8 @@ evalPQ (PQ pq) conn = unK <$> pq conn

208202-- [enriched category](https://ncatlab.org/nlab/show/enriched+category).

209203-- An indexed monad transformer transforms a `Monad` into an indexed monad.

210204-- And, `IndexedMonadTransPQ` is a class for indexed monad transformers that

211−-- support running `Definition`s using `define`.

205+-- support running `Definition`s using `define` and embedding a computation

206+-- in a larger schema using `pqEmbed`.

212207class IndexedMonadTransPQ pq where

213208

214209 -- | indexed analog of `<*>`

@@ -248,16 +243,19 @@ class IndexedMonadTransPQ pq where

248243 -> x -> pq schemas0 schemas2 m z

249244 pqAndThen g f x = pqBind g (f x)

250245

251− -- | Run a `Definition` with `LibPQ.exec`.

252− --

253− -- It should be functorial in effect.

246+ -- | Safely embed a computation in a larger schema.

247+ pqEmbed

248+ :: Monad m

249+ => pq schemas0 schemas1 m x

250+ -> pq (schema ': schemas0) (schema : schemas1) m x

251+

252+ -- | Run a `Definition` with `LibPQ.exec`, we expect that libpq obeys the law

254253 --

255− -- @define id = return ()@

256− -- @define (statement1 >>> statement2) = define statement1 & pqThen (define statement2)@

254+ -- @define statement1 & pqThen (define statement2) = define (statement1 >>> statement2)@

257255 define

258− :: MonadIO io

256+ :: MonadBase IO io

259257 => Definition schemas0 schemas1

260− -> pq schemas0 schemas1 io ()

258+ -> pq schemas0 schemas1 io (K LibPQ.Result '[])

261259

262260instance IndexedMonadTransPQ PQ where

263261

@@ -270,12 +268,16 @@ instance IndexedMonadTransPQ PQ where

270268 K x' <- x conn

271269 unPQ (f x') (K (unK conn))

272270

271+ pqEmbed (PQ pq) = PQ $ \ (K conn) -> do

272+ K x <- pq (K conn)

273+ return $ K x

274+

273275 define (UnsafeDefinition q) = PQ $ \ (K conn) -> do

274− resultMaybe <- liftIO $ LibPQ.exec conn q

276+ resultMaybe <- liftBase $ LibPQ.exec conn q

275277 case resultMaybe of

276278 Nothing -> throw $ ResultException

277279 "define: LibPQ.exec returned no results"

278− Just result -> K <$> okResult_ result

280+ Just result -> return $ K (K result)

279281

280282{- | `MonadPQ` is an @mtl@ style constraint, similar to

281283`Control.Monad.State.Class.MonadState`, for using `Database.PostgreSQL.LibPQ` to

@@ -284,12 +286,8 @@ instance IndexedMonadTransPQ PQ where

284286 with a `ToParams` constraint. It calls `LibPQ.execParams` and

285287 doesn't afraid of anything.

286288

287−* `manipulateParams_` is like `manipulateParams` for a returning-free statement.

288−

289289* `manipulate` is like `manipulateParams` for a parameter-free statement.

290290

291−* `manipulate_` is like `manipulate` for a returning-free statement.

292−

293291* `runQueryParams` is like `manipulateParams` for query statements.

294292

295293* `runQuery` is like `runQueryParams` for a parameter-free statement.

@@ -303,7 +301,7 @@ instance IndexedMonadTransPQ PQ where

303301* `forPrepared` is a flipped `traversePrepared`

304302

305303* `traversePrepared_` is like `traversePrepared` but works on `Foldable`

306− containers for a returning-free statement.

304+ containers and returns unit.

307305

308306* `forPrepared_` is a flipped `traversePrepared_`.

309307

@@ -317,34 +315,24 @@ a default instance.

317315-}

318316class Monad pq => MonadPQ schemas pq | pq -> schemas where

319317 manipulateParams

320− :: (ToParams x params, All OidOfParam params)

318+ :: ToParams x params

321319 => Manipulation '[] schemas params ys

322320 -- ^ `insertInto`, `update` or `deleteFrom`

323321 -> x -> pq (K LibPQ.Result ys)

324322 default manipulateParams

325323 :: (MonadTrans t, MonadPQ schemas pq1, pq ~ t pq1)

326− => (ToParams x params, All OidOfParam params)

324+ => ToParams x params

327325 => Manipulation '[] schemas params ys

328326 -- ^ `insertInto`, `update` or `deleteFrom`

329327 -> x -> pq (K LibPQ.Result ys)

330328 manipulateParams manipulation params = lift $

331329 manipulateParams manipulation params

332330

333− manipulateParams_

334− :: (ToParams x params, All OidOfParam params)

335− => Manipulation '[] schemas params '[]

336− -- ^ `insertInto`, `update` or `deleteFrom`

337− -> x -> pq ()

338− manipulateParams_ q x = void $ manipulateParams q x

339−

340331 manipulate :: Manipulation '[] schemas '[] ys -> pq (K LibPQ.Result ys)

341332 manipulate statement = manipulateParams statement ()

342333

343− manipulate_ :: Manipulation '[] schemas '[] '[] -> pq ()

344− manipulate_ = void . manipulate

345−

346334 runQueryParams

347− :: (ToParams x params, All OidOfParam params)

335+ :: ToParams x params

348336 => Query '[] '[] schemas params ys

349337 -- ^ `select` and friends

350338 -> x -> pq (K LibPQ.Result ys)

@@ -357,19 +345,19 @@ class Monad pq => MonadPQ schemas pq | pq -> schemas where

357345 runQuery q = runQueryParams q ()

358346

359347 traversePrepared

360− :: (ToParams x params, Traversable list, All OidOfParam params)

348+ :: (ToParams x params, Traversable list)

361349 => Manipulation '[] schemas params ys

362350 -- ^ `insertInto`, `update`, or `deleteFrom`, and friends

363351 -> list x -> pq (list (K LibPQ.Result ys))

364352 default traversePrepared

365353 :: (MonadTrans t, MonadPQ schemas pq1, pq ~ t pq1)

366− => (ToParams x params, Traversable list, All OidOfParam params)

354+ => (ToParams x params, Traversable list)

367355 => Manipulation '[] schemas params ys -> list x -> pq (list (K LibPQ.Result ys))

368356 traversePrepared manipulation params = lift $

369357 traversePrepared manipulation params

370358

371359 forPrepared

372− :: (ToParams x params, Traversable list, All OidOfParam params)

360+ :: (ToParams x params, Traversable list)

373361 => list x

374362 -> Manipulation '[] schemas params ys

375363 -- ^ `insertInto`, `update` or `deleteFrom`

@@ -377,13 +365,13 @@ class Monad pq => MonadPQ schemas pq | pq -> schemas where

377365 forPrepared = flip traversePrepared

378366

379367 traversePrepared_

380− :: (ToParams x params, Foldable list, All OidOfParam params)

368+ :: (ToParams x params, Foldable list)

381369 => Manipulation '[] schemas params '[]

382370 -- ^ `insertInto`, `update` or `deleteFrom`

383371 -> list x -> pq ()

384372 default traversePrepared_

385373 :: (MonadTrans t, MonadPQ schemas pq1, pq ~ t pq1)

386− => (ToParams x params, Foldable list, All OidOfParam params)

374+ => (ToParams x params, Foldable list)

387375 => Manipulation '[] schemas params '[]

388376 -- ^ `insertInto`, `update` or `deleteFrom`

389377 -> list x -> pq ()

@@ -391,7 +379,7 @@ class Monad pq => MonadPQ schemas pq | pq -> schemas where

391379 traversePrepared_ manipulation params

392380

393381 forPrepared_

394− :: (ToParams x params, Foldable list, All OidOfParam params)

382+ :: (ToParams x params, Foldable list)

395383 => list x

396384 -> Manipulation '[] schemas params '[]

397385 -- ^ `insertInto`, `update` or `deleteFrom`

@@ -404,83 +392,61 @@ class Monad pq => MonadPQ schemas pq | pq -> schemas where

404392 => (LibPQ.Connection -> IO a) -> pq a

405393 liftPQ = lift . liftPQ

406394

407−instance (MonadIO io, schemas0 ~ schemas, schemas1 ~ schemas)

395+instance (MonadBase IO io, schemas0 ~ schemas, schemas1 ~ schemas)

408396 => MonadPQ schemas (PQ schemas0 schemas1 io) where

409397

410398 manipulateParams

411399 (UnsafeManipulation q :: Manipulation '[] schemas ps ys) (params :: x) =

412400 PQ $ \ (K conn) -> do

413401 let

414− paramSet

415− :: forall param. OidOfParam param

416− => K (Maybe Encoding.Encoding) param

417− -> K (Maybe (LibPQ.Oid, ByteString, LibPQ.Format)) param

418− paramSet (K maybeEncoding) = K $

419− maybeEncoding <&> \encoding ->

420− (oidOfParam @param, encodingBytes encoding, LibPQ.Binary)

421− params'

422− = hcollapse

423− . hcmap (Proxy @OidOfParam) paramSet

424− $ toParams @x @ps params

402+ toParam' encoding =

403+ (LibPQ.invalidOid, encodingBytes encoding, LibPQ.Binary)

404+ params' = fmap (fmap toParam') (hcollapse (toParams @x @ps params))

425405 q' = q <> ";"

426− resultMaybe <- liftIO $ LibPQ.execParams conn q' params' LibPQ.Binary

406+ resultMaybe <- liftBase $ LibPQ.execParams conn q' params' LibPQ.Binary

427407 case resultMaybe of

428408 Nothing -> throw $ ResultException

429409 "manipulateParams: LibPQ.execParams returned no results"

430410 Just result -> do

431− okResult_ result

411+ tryResult result

432412 return $ K (K result)

433413

434414 traversePrepared

435415 (UnsafeManipulation q :: Manipulation '[] schemas xs ys) (list :: list x) =

436− PQ $ \ (K conn) -> liftIO $ do

437− let

438− temp = "temporary_statement"

439− paramOid :: forall p. OidOfParam p => K LibPQ.Oid p

440− paramOid = K (oidOfParam @p)

441− paramOids :: NP (K LibPQ.Oid) xs

442− paramOids = hcpure (Proxy @OidOfParam) paramOid

443− paramOids' :: [LibPQ.Oid]

444− paramOids' = hcollapse paramOids

445− prepResultMaybe <- LibPQ.prepare conn temp q (Just paramOids')

416+ PQ $ \ (K conn) -> liftBase $ do

417+ let temp = "temporary_statement"

418+ prepResultMaybe <- LibPQ.prepare conn temp q Nothing

446419 case prepResultMaybe of

447420 Nothing -> throw $ ResultException

448421 "traversePrepared: LibPQ.prepare returned no results"

449− Just prepResult -> okResult_ prepResult

422+ Just prepResult -> tryResult prepResult

450423 results <- for list $ \ params -> do

451424 let

452− toParam' encoding = (encodingBytes encoding, LibPQ.Binary)

425+ toParam' encoding = (encodingBytes encoding,LibPQ.Binary)

453426 params' = fmap (fmap toParam') (hcollapse (toParams @x @xs params))

454427 resultMaybe <- LibPQ.execPrepared conn temp params' LibPQ.Binary

455428 case resultMaybe of

456429 Nothing -> throw $ ResultException

457430 "traversePrepared: LibPQ.execParams returned no results"

458431 Just result -> do

459− okResult_ result

432+ tryResult result

460433 return $ K result

461434 deallocResultMaybe <- LibPQ.exec conn ("DEALLOCATE " <> temp <> ";")

462435 case deallocResultMaybe of

463436 Nothing -> throw $ ResultException

464437 "traversePrepared: LibPQ.exec DEALLOCATE returned no results"

465− Just deallocResult -> okResult_ deallocResult

438+ Just deallocResult -> tryResult deallocResult

466439 return (K results)

467440

468441 traversePrepared_

469442 (UnsafeManipulation q :: Manipulation '[] schemas xs '[]) (list :: list x) =

470− PQ $ \ (K conn) -> liftIO $ do

471− let

472− temp = "temporary_statement"

473− paramOid :: forall p. OidOfParam p => K LibPQ.Oid p

474− paramOid = K (oidOfParam @p)

475− paramOids :: NP (K LibPQ.Oid) xs

476− paramOids = hcpure (Proxy @OidOfParam) paramOid

477− paramOids' :: [LibPQ.Oid]

478− paramOids' = hcollapse paramOids

479− prepResultMaybe <- LibPQ.prepare conn temp q (Just paramOids')

443+ PQ $ \ (K conn) -> liftBase $ do

444+ let temp = "temporary_statement"

445+ prepResultMaybe <- LibPQ.prepare conn temp q Nothing

480446 case prepResultMaybe of

481447 Nothing -> throw $ ResultException

482448 "traversePrepared_: LibPQ.prepare returned no results"

483− Just prepResult -> okResult_ prepResult

449+ Just prepResult -> tryResult prepResult

484450 for_ list $ \ params -> do

485451 let

486452 toParam' encoding = (encodingBytes encoding, LibPQ.Binary)

@@ -489,16 +455,16 @@ instance (MonadIO io, schemas0 ~ schemas, schemas1 ~ schemas)

489455 case resultMaybe of

490456 Nothing -> throw $ ResultException

491457 "traversePrepared_: LibPQ.execParams returned no results"

492− Just result -> okResult_ result

458+ Just result -> tryResult result

493459 deallocResultMaybe <- LibPQ.exec conn ("DEALLOCATE " <> temp <> ";")

494460 case deallocResultMaybe of

495461 Nothing -> throw $ ResultException

496462 "traversePrepared: LibPQ.exec DEALLOCATE returned no results"

497− Just deallocResult -> okResult_ deallocResult

463+ Just deallocResult -> tryResult deallocResult

498464 return (K ())

499465

500466 liftPQ pq = PQ $ \ (K conn) -> do

501− y <- liftIO $ pq conn

467+ y <- liftBase $ pq conn

502468 return (K y)

503469

504470instance MonadPQ schemas m => MonadPQ schemas (IdentityT m)

@@ -539,29 +505,40 @@ instance schemas0 ~ schemas1 => MMonad (PQ schemas0 schemas1) where

539505 embed f (PQ pq) = PQ $ \ conn -> do

540506 evalPQ (f (pq conn)) conn

541507

508+instance (MonadBase b m, schemas0 ~ schemas1)

509+ => MonadBase b (PQ schemas0 schemas1 m) where

510+ liftBase = lift . liftBase

511+

542512instance (MonadIO m, schema0 ~ schema1)

543513 => MonadIO (PQ schema0 schema1 m) where

544514 liftIO = lift . liftIO

545515

546−instance (MonadUnliftIO m, schemas0 ~ schemas1)

547− => MonadUnliftIO (PQ schemas0 schemas1 m) where

548− withRunInIO

549− :: ((forall a . PQ schemas0 schema1 m a -> IO a) -> IO b)

550− -> PQ schemas0 schema1 m b

551− withRunInIO inner = PQ $ \conn ->

552− withRunInIO $ \(run :: (forall x . m x -> IO x)) ->

553− K <$> inner (\pq -> run $ unK <$> unPQ pq conn)

516+-- | A snapshot of the state of a `PQ` computation.

517+type PQRun schemas =

518+ forall m x. Monad m => PQ schemas schemas m x -> m (K x schemas)

519+

520+-- | Helper function in defining `MonadBaseControl` instance for `PQ`.

521+pqliftWith :: Functor m => (PQRun schemas -> m a) -> PQ schemas schemas m a

522+pqliftWith f = PQ $ \ conn ->

523+ fmap K (f $ \ pq -> unPQ pq conn)

524+

525+instance (MonadBaseControl b m, schemas0 ~ schemas1)

526+ => MonadBaseControl b (PQ schemas0 schemas1 m) where

527+ type StM (PQ schemas0 schemas1 m) x = StM m (K x schemas0)

528+ liftBaseWith f =

529+ pqliftWith $ \ run -> liftBaseWith $ \ runInBase -> f $ runInBase . run

530+ restoreM = PQ . const . restoreM

554531

555532-- | Get a row corresponding to a given row number from a `LibPQ.Result`,

556533-- throwing an exception if the row number is out of bounds.

557534getRow

558− :: (FromRow columns y, MonadIO io)

535+ :: (FromRow columns y, MonadBase IO io)

559536 => LibPQ.Row

560537 -- ^ row number

561538 -> K LibPQ.Result columns

562539 -- ^ result

563540 -> io y

564−getRow r (K result :: K LibPQ.Result columns) = liftIO $ do

541+getRow r (K result :: K LibPQ.Result columns) = liftBase $ do

565542 numRows <- LibPQ.ntuples result

566543 when (numRows < r) $ throw $ ResultException $

567544 "getRow: expected at least " <> pack (show r) <> "rows but only saw "

@@ -579,13 +556,13 @@ getRow r (K result :: K LibPQ.Result columns) = liftIO $ do

579556-- and a `LibPQ.Result` and given a row number if it's too large returns `Nothing`,

580557-- otherwise returning the row along with the next row number.

581558nextRow

582− :: (FromRow columns y, MonadIO io)

559+ :: (FromRow columns y, MonadBase IO io)

583560 => LibPQ.Row -- ^ total number of rows

584561 -> K LibPQ.Result columns -- ^ result

585562 -> LibPQ.Row -- ^ row number

586563 -> io (Maybe (LibPQ.Row,y))

587564nextRow total (K result :: K LibPQ.Result columns) r

588− = liftIO $ if r >= total then return Nothing else do

565+ = liftBase $ if r >= total then return Nothing else do

589566 let len = fromIntegral (lengthSList (Proxy @columns))

590567 row' <- traverse (LibPQ.getvalue result r) [0 .. len - 1]

591568 case fromList row' of

@@ -596,10 +573,10 @@ nextRow total (K result :: K LibPQ.Result columns) r

596573

597574-- | Get all rows from a `LibPQ.Result`.

598575getRows

599− :: (FromRow columns y, MonadIO io)

576+ :: (FromRow columns y, MonadBase IO io)

600577 => K LibPQ.Result columns -- ^ result

601578 -> io [y]

602−getRows (K result :: K LibPQ.Result columns) = liftIO $ do

579+getRows (K result :: K LibPQ.Result columns) = liftBase $ do

603580 let len = fromIntegral (lengthSList (Proxy @columns))

604581 numRows <- LibPQ.ntuples result

605582 for [0 .. numRows - 1] $ \ r -> do

@@ -612,10 +589,10 @@ getRows (K result :: K LibPQ.Result columns) = liftIO $ do

612589

613590-- | Get the first row if possible from a `LibPQ.Result`.

614591firstRow

615− :: (FromRow columns y, MonadIO io)

592+ :: (FromRow columns y, MonadBase IO io)

616593 => K LibPQ.Result columns -- ^ result

617594 -> io (Maybe y)

618−firstRow (K result :: K LibPQ.Result columns) = liftIO $ do

595+firstRow (K result :: K LibPQ.Result columns) = liftBase $ do

619596 numRows <- LibPQ.ntuples result

620597 if numRows <= 0 then return Nothing else do

621598 let len = fromIntegral (lengthSList (Proxy @columns))

@@ -628,23 +605,23 @@ firstRow (K result :: K LibPQ.Result columns) = liftIO $ do

628605

629606-- | Lifts actions on results from @LibPQ@.

630607liftResult

631− :: MonadIO io

608+ :: MonadBase IO io

632609 => (LibPQ.Result -> IO x)

633610 -> K LibPQ.Result results -> io x

634−liftResult f (K result) = liftIO $ f result

611+liftResult f (K result) = liftBase $ f result

635612

636613-- | Returns the number of rows (tuples) in the query result.

637−ntuples :: MonadIO io => K LibPQ.Result columns -> io LibPQ.Row

614+ntuples :: MonadBase IO io => K LibPQ.Result columns -> io LibPQ.Row

638615ntuples = liftResult LibPQ.ntuples

639616

640617-- | Returns the result status of the command.

641−resultStatus :: MonadIO io => K LibPQ.Result results -> io LibPQ.ExecStatus

618+resultStatus :: MonadBase IO io => K LibPQ.Result results -> io LibPQ.ExecStatus

642619resultStatus = liftResult LibPQ.resultStatus

643620

644621-- | Returns the error message most recently generated by an operation

645622-- on the connection.

646623resultErrorMessage

647− :: MonadIO io => K LibPQ.Result results -> io (Maybe ByteString)

624+ :: MonadBase IO io => K LibPQ.Result results -> io (Maybe ByteString)

648625resultErrorMessage = liftResult LibPQ.resultErrorMessage

649626

650627-- | Returns the error code most recently generated by an operation

@@ -652,29 +629,29 @@ resultErrorMessage = liftResult LibPQ.resultErrorMessage

652629--

653630-- https://www.postgresql.org/docs/current/static/errcodes-appendix.html

654631resultErrorCode

655− :: MonadIO io

632+ :: MonadBase IO io

656633 => K LibPQ.Result results

657634 -> io (Maybe ByteString)

658635resultErrorCode = liftResult (flip LibPQ.resultErrorField LibPQ.DiagSqlstate)

659636

660−-- | the state of LibPQ

661−data PQState = PQState

637+-- | `Exception`s that can be thrown by Squeal.

638+data SquealException

639+ = PQException

662640 { sqlExecStatus :: LibPQ.ExecStatus

663641 , sqlStateCode :: Maybe ByteString

664642 -- ^ https://www.postgresql.org/docs/current/static/errcodes-appendix.html

665643 , sqlErrorMessage :: Maybe ByteString

666− } deriving (Eq, Show)

667−

668−-- | `Exception`s that can be thrown by Squeal.

669−data SquealException

670− = PQException PQState

644+ }

671645 | ResultException Text

672646 | ParseException Text

673647 deriving (Eq, Show)

674648instance Exception SquealException

675649

676−okResult_ :: MonadIO io => LibPQ.Result -> io ()

677−okResult_ result = liftIO $ do

650+tryResult

651+ :: MonadBase IO io

652+ => LibPQ.Result

653+ -> io ()

654+tryResult result = liftBase $ do

678655 status <- LibPQ.resultStatus result

679656 case status of

680657 LibPQ.CommandOk -> return ()

@@ -682,16 +659,11 @@ okResult_ result = liftIO $ do

682659 _ -> do

683660 stateCode <- LibPQ.resultErrorField result LibPQ.DiagSqlstate

684661 msg <- LibPQ.resultErrorMessage result

685− throw . PQException $ PQState status stateCode msg

686−

687−-- | Check if a `LibPQ.Result`'s status is either `LibPQ.CommandOk`

688−-- or `LibPQ.TuplesOk` otherwise `throw` a `PQException`.

689−okResult :: MonadIO io => K LibPQ.Result row -> io ()

690−okResult = okResult_ . unK

662+ throw $ PQException status stateCode msg

691663

692664-- | Catch `SquealException`s.

693665catchSqueal

694− :: MonadUnliftIO io

666+ :: MonadBaseControl IO io

695667 => io a

696668 -> (SquealException -> io a) -- ^ handler

697669 -> io a

@@ -699,14 +671,7 @@ catchSqueal = catch

699671

700672-- | Handle `SquealException`s.

701673handleSqueal

702− :: MonadUnliftIO io

674+ :: MonadBaseControl IO io

703675 => (SquealException -> io a) -- ^ handler

704676 -> io a -> io a

705677handleSqueal = handle

706−

707−-- | `Either` return a `SquealException` or a result.

708−trySqueal

709− :: MonadUnliftIO io

710− => io a

711− -> io (Either SquealException a)

712−trySqueal = try

squeal-postgresql/src/Squeal/PostgreSQL/Pool.hs+109−72

@@ -1,40 +1,17 @@

11{-|

2−Module: Squeal.PostgreSQL.Pool

3−Description: Connection pools

2+Module: Squeal.PostgreSQL.Definition

3+Description: Pooled connections

44Copyright: (c) Eitan Chatav, 2017

55Maintainer: eitan@morphism.tech

66Stability: experimental

8−Connection pools.

9−

10−Typical use case would be to create your pool using `createConnectionPool`

11−and run anything that requires the pool connection with `usingConnectionPool`.

12−

13−Here's a simplified example:

14−

15−>>> import Squeal.PostgreSQL

16−

17−>>> :{

18−do

19− let

20− query :: Query_ (Public '[]) () (Only Char)

21− query = values_ (literal 'a' `as` #fromOnly)

22− pool <- createConnectionPool "host=localhost port=5432 dbname=exampledb" 1 0.5 10

23− chr <- usingConnectionPool pool $ do

24− result <- runQuery query

25− Just (Only a) <- firstRow result

26− return a

27− destroyConnectionPool pool

28− putChar chr

29−:}

30−a

8+A `MonadPQ` for pooled connections.

319-}

3210

3311{-# LANGUAGE

3412 DeriveFunctor

3513 , FlexibleContexts

3614 , FlexibleInstances

37− , InstanceSigs

3815 , MultiParamTypeClasses

3916 , RankNTypes

4017 , ScopedTypeVariables

@@ -45,24 +22,57 @@ a

4522

4623module Squeal.PostgreSQL.Pool

4724 ( -- * Pools

48− Pool

25+ PoolPQ (..)

4926 , createConnectionPool

50− , usingConnectionPool

51− , destroyConnectionPool

27+ , Pool

28+ , destroyAllResources

29+ , PoolPQRun

30+ , poolpqliftWith

5231 ) where

5332

33+import Control.Monad.Base

34+import Control.Monad.Trans

35+import Control.Monad.Trans.Control

5436import Data.ByteString

37+import Data.Pool

5538import Data.Time

56−import Generics.SOP (K(..), unK)

57−import UnliftIO (MonadUnliftIO (..))

58−import UnliftIO.Pool (Pool, createPool, destroyAllResources, withResource)

39+import Generics.SOP (K(..))

40+

41+import qualified Control.Monad.Fail as Fail

5942

6043import Squeal.PostgreSQL.PQ

44+import Squeal.PostgreSQL.Schema

45+

46+{- | `PoolPQ` @schemas@ should be a drop-in replacement for `PQ` @schemas schemas@.

47+

48+Typical use case would be to create your pool using `createConnectionPool` and run anything that requires the pool connection with it.

49+

50+Here's a simplified example:

51+

52+> type Schema = '[ "tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint2])]

53+>

54+> someQuery :: Manipulation Schema '[ 'NotNull 'PGint2] '[]

55+> someQuery = insertRow #tab

56+> (Set (param @1) `As` #col :* Nil)

57+> OnConflictDoNothing (Returning Nil)

58+>

59+> insertOne :: (MonadBaseControl IO m, MonadPQ Schema m) => m ()

60+> insertOne = void $ manipulateParams someQuery . Only $ (1 :: Int16)

61+>

62+> insertOneInPool :: ByteString -> IO ()

63+> insertOneInPool connectionString = do

64+> pool <- createConnectionPool connectionString 1 0.5 10

65+> liftIO $ runPoolPQ (insertOne) pool

66+

67+-}

68+newtype PoolPQ (schemas :: SchemasType) m x =

69+ PoolPQ { runPoolPQ :: Pool (K Connection schemas) -> m x }

70+ deriving Functor

6171

6272-- | Create a striped pool of connections.

6373-- Although the garbage collector will destroy all idle connections when the pool is garbage collected it's recommended to manually `destroyAllResources` when you're done with the pool so that the connections are freed up as soon as possible.

6474createConnectionPool

65− :: MonadUnliftIO io

75+ :: MonadBase IO io

6676 => ByteString

6777 -- ^ The passed string can be empty to use all default parameters, or it can

6878 -- contain one or more parameter settings separated by whitespace.

@@ -79,44 +89,71 @@ createConnectionPool

7989 -- ^ Maximum number of connections to keep open per stripe. The smallest acceptable value is 1.

8090 -- Requests for connections will block if this limit is reached on a single stripe, even if other stripes have idle connections available.

8191 -> io (Pool (K Connection schemas))

82−createConnectionPool conninfo stripes idle maxResrc =

92+createConnectionPool conninfo stripes idle maxResrc = liftBase $

8393 createPool (connectdb conninfo) finish stripes idle maxResrc

8494

85−{-|

86−Temporarily take a connection from a `Pool`, perform an action with it,

87−and return it to the pool afterwards.

88−

89−If the pool has an idle connection available, it is used immediately.

90−Otherwise, if the maximum number of connections has not yet been reached,

91−a new connection is created and used.

92−If the maximum number of connections has been reached, this function blocks

93−until a connection becomes available.

94−-}

95−usingConnectionPool

96− :: MonadUnliftIO io

97− => Pool (K Connection schemas) -- ^ pool

98− -> PQ schemas schemas io x -- ^ session

99− -> io x

100−usingConnectionPool pool (PQ session) = unK <$> withResource pool session

101−

102−{- |

103−Destroy all connections in all stripes in the pool.

104−Note that this will ignore any exceptions in the destroy function.

105−

106−This function is useful when you detect that all connections

107−in the pool are broken. For example after a database has been

108−restarted all connections opened before the restart will be broken.

109−In that case it's better to close those connections so that

110−`usingConnectionPool` won't take a broken connection from the pool

111−but will open a new connection instead.

112−

113−Another use-case for this function is that when you know you are done

114−with the pool you can destroy all idle connections immediately

115−instead of waiting on the garbage collector to destroy them,

116−thus freeing up those connections sooner.

117−-}

118−destroyConnectionPool

119− :: MonadUnliftIO io

120− => Pool (K Connection schemas) -- ^ pool

121− -> io ()

122−destroyConnectionPool = destroyAllResources

95+-- | `Applicative` instance for `PoolPQ`.

96+instance Monad m => Applicative (PoolPQ schemas m) where

97+ pure x = PoolPQ $ \ _ -> pure x

98+ PoolPQ f <*> PoolPQ x = PoolPQ $ \ pool -> do

99+ f' <- f pool

100+ x' <- x pool

101+ return $ f' x'

102+

103+-- | `Monad` instance for `PoolPQ`.

104+instance Monad m => Monad (PoolPQ schemas m) where

105+ return = pure

106+ PoolPQ x >>= f = PoolPQ $ \ pool -> do

107+ x' <- x pool

108+ runPoolPQ (f x') pool

109+

110+-- | `Fail.MonadFail` instance for `PoolPQ`.

111+instance Monad m => Fail.MonadFail (PoolPQ schemas m) where

112+ fail = Fail.fail

113+

114+-- | `MonadTrans` instance for `PoolPQ`.

115+instance MonadTrans (PoolPQ schemas) where

116+ lift m = PoolPQ $ \ _pool -> m

117+

118+-- | `MonadBase` instance for `PoolPQ`.

119+instance MonadBase b m => MonadBase b (PoolPQ schemas m) where

120+ liftBase = lift . liftBase

121+

122+-- | `MonadPQ` instance for `PoolPQ`.

123+instance MonadBaseControl IO io => MonadPQ schemas (PoolPQ schemas io) where

124+ manipulateParams manipulation params = PoolPQ $ \ pool -> do

125+ withResource pool $ \ conn -> do

126+ (K result :: K (K Result ys) schemas) <- flip unPQ conn $

127+ manipulateParams manipulation params

128+ return result

129+ traversePrepared manipulation params = PoolPQ $ \ pool ->

130+ withResource pool $ \ conn -> do

131+ (K result :: K (list (K Result ys)) schemas) <- flip unPQ conn $

132+ traversePrepared manipulation params

133+ return result

134+ traversePrepared_ manipulation params = PoolPQ $ \ pool -> do

135+ withResource pool $ \ conn -> do

136+ (_ :: K () schemas) <- flip unPQ conn $

137+ traversePrepared_ manipulation params

138+ return ()

139+ liftPQ m = PoolPQ $ \ pool ->

140+ withResource pool $ \ conn -> do

141+ (K result :: K result schemas) <- flip unPQ conn $

142+ liftPQ m

143+ return result

144+

145+-- | A snapshot of the state of a `PoolPQ` computation.

146+type PoolPQRun schemas =

147+ forall m x. Monad m => PoolPQ schemas m x -> m x

148+

149+-- | Helper function in defining `MonadBaseControl` instance for `PoolPQ`.

150+poolpqliftWith :: Functor m => (PoolPQRun schemas -> m a) -> PoolPQ schemas m a

151+poolpqliftWith f = PoolPQ $ \ pool ->

152+ (f $ \ pq -> runPoolPQ pq pool)

153+

154+-- | `MonadBaseControl` instance for `PoolPQ`.

155+instance MonadBaseControl b m => MonadBaseControl b (PoolPQ schemas m) where

156+ type StM (PoolPQ schemas m) x = StM m x

157+ liftBaseWith f =

158+ poolpqliftWith $ \ run -> liftBaseWith $ \ runInBase -> f $ runInBase . run

159+ restoreM = PoolPQ . const . restoreM

squeal-postgresql/src/Squeal/PostgreSQL/Query.hs+429−310

@@ -1,7 +1,7 @@

11{-|

22Module: Squeal.PostgreSQL.Query

33Description: Squeal queries

4−Copyright: (c) Eitan Chatav, 2019

4+Copyright: (c) Eitan Chatav, 2017

55Maintainer: eitan@morphism.tech

66Stability: experimental

@@ -32,15 +32,13 @@ Squeal queries.

3232

3333module Squeal.PostgreSQL.Query

3434 ( -- * Queries

35− Query_

36− , Query (..)

35+ Query (..)

36+ , Query_

3737 -- ** Select

3838 , select

3939 , select_

4040 , selectDistinct

4141 , selectDistinct_

42− , selectDistinctOn

43− , selectDistinctOn_

4442 , Selection (..)

4543 -- ** Values

4644 , values

@@ -55,7 +53,23 @@ module Squeal.PostgreSQL.Query

5553 -- ** With

5654 , With (..)

5755 , CommonTableExpression (..)

58− , withRecursive

56+ -- ** Unnest

57+ , unnest

58+ -- ** Json

59+ , jsonEach

60+ , jsonbEach

61+ , jsonEachText

62+ , jsonbEachText

63+ , jsonObjectKeys

64+ , jsonbObjectKeys

65+ , jsonPopulateRecord

66+ , jsonbPopulateRecord

67+ , jsonPopulateRecordSet

68+ , jsonbPopulateRecordSet

69+ , jsonToRecord

70+ , jsonbToRecord

71+ , jsonToRecordSet

72+ , jsonbToRecordSet

5973 -- * Table Expressions

6074 , TableExpression (..)

6175 , from

@@ -79,6 +93,13 @@ module Squeal.PostgreSQL.Query

7993 , By (..)

8094 , GroupByClause (..)

8195 , HavingClause (..)

96+ -- * Subquery Expressions

97+ , exists

98+ , in_

99+ , notIn

100+ , Operator

101+ , subAll

102+ , subAny

82103 ) where

83104

84105import Control.DeepSeq

@@ -91,67 +112,14 @@ import GHC.TypeLits

91112

92113import qualified GHC.Generics as GHC

93114

94−import Squeal.PostgreSQL.Alias

115+import Squeal.PostgreSQL.Binary

95116import Squeal.PostgreSQL.Expression

96−import Squeal.PostgreSQL.Expression.Logic

97−import Squeal.PostgreSQL.Expression.Sort

98−import Squeal.PostgreSQL.Expression.Window

99−import Squeal.PostgreSQL.List

100−import Squeal.PostgreSQL.PG

101117import Squeal.PostgreSQL.Render

102118import Squeal.PostgreSQL.Schema

103119

104−-- $setup

105−-- >>> import Squeal.PostgreSQL

106−-- >>> import Data.Int (Int32, Int64)

107−-- >>> import Data.Monoid (Sum (..))

108−-- >>> import Data.Text (Text)

109−-- >>> import qualified Generics.SOP as SOP

110−

111−{- |

112−The process of retrieving or the command to retrieve data from

113−a database is called a `Query`.

114−

115−The general `Query` type is parameterized by

116−

117−* @outer :: FromType@ - outer scope for a correlated subquery,

118−* @commons :: FromType@ - scope for all `common` table expressions,

119−* @schemas :: SchemasType@ - scope for all `table`s and `view`s,

120−* @params :: [NullityType]@ - scope for all `Squeal.Expression.Parameter.parameter`s,

121−* @row :: RowType@ - return type of the `Query`.

122−-}

123−newtype Query

124− (outer :: FromType)

125− (commons :: FromType)

126− (schemas :: SchemasType)

127− (params :: [NullityType])

128− (row :: RowType)

129− = UnsafeQuery { renderQuery :: ByteString }

130− deriving (GHC.Generic,Show,Eq,Ord,NFData)

131−instance RenderSQL (Query outer commons schemas params row) where renderSQL = renderQuery

132−

133120{- |

134−The top level `Query_` type is parameterized by a @schemas@ `SchemasType`,

135−against which the query is type-checked, an input @parameters@ Haskell `Type`,

136−and an ouput row Haskell `Type`.

137−

138−A top-level query can be run

139−using `Squeal.PostgreSQL.PQ.runQueryParams`, or if @parameters = ()@

140−using `Squeal.PostgreSQL.PQ.runQuery`.

141−

142−Generally, @parameters@ will be a Haskell tuple or record whose entries

143−may be referenced using positional

144−`Squeal.PostgreSQL.Expression.Parameter.parameter`s and @row@ will be a

145−Haskell record, whose entries will be targeted using overloaded labels.

146−

147−Let's see some examples of queries.

148−

149−>>> :set -XDeriveAnyClass -XDerivingStrategies

150−>>> :{

151−data Row a b = Row { col1 :: a, col2 :: b }

152− deriving stock (GHC.Generic)

153− deriving anyclass (SOP.Generic, SOP.HasDatatypeInfo)

154−:}

121+The process of retrieving or the command to retrieve data from a database

122+is called a `Query`. Let's see some examples of queries.

155123

156124simple query:

157125

@@ -159,7 +127,7 @@ simple query:

159127>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]

160128>>> :{

161129let

162− query :: Query_ (Public Schema) () (Row Int32 Int32)

130+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

163131 query = select Star (from (table #tab))

164132in printSQL query

165133:}

@@ -169,21 +137,21 @@ restricted query:

169137

170138>>> :{

171139let

172− query :: Query_ (Public Schema) () (Row Int32 Int32)

140+ query :: Query '[] '[] (Public Schema) '[] '["sum" ::: 'NotNull 'PGint4, "col1" ::: 'NotNull 'PGint4]

173141 query =

174− select_ ((#col1 + #col2) `as` #col1 :* #col1 `as` #col2)

142+ select_ ((#col1 + #col2) `as` #sum :* #col1)

175143 ( from (table #tab)

176144 & where_ (#col1 .> #col2)

177145 & where_ (#col2 .> 0) )

178146in printSQL query

179147:}

180−SELECT ("col1" + "col2") AS "col1", "col1" AS "col2" FROM "tab" AS "tab" WHERE (("col1" > "col2") AND ("col2" > 0))

148+SELECT ("col1" + "col2") AS "sum", "col1" AS "col1" FROM "tab" AS "tab" WHERE (("col1" > "col2") AND ("col2" > 0))

181149

182150subquery:

183151

184152>>> :{

185153let

186− query :: Query_ (Public Schema) () (Row Int32 Int32)

154+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

187155 query = select Star (from (subquery (select Star (from (table #tab)) `as` #sub)))

188156in printSQL query

189157:}

@@ -193,7 +161,7 @@ limits and offsets:

193161

194162>>> :{

195163let

196− query :: Query_ (Public Schema) () (Row Int32 Int32)

164+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

197165 query = select Star (from (table #tab) & limit 100 & offset 2 & limit 50 & offset 2)

198166in printSQL query

199167:}

@@ -203,7 +171,7 @@ parameterized query:

203171

204172>>> :{

205173let

206− query :: Query_ (Public Schema) (Only Int32) (Row Int32 Int32)

174+ query :: Query '[] '[] (Public Schema) '[ 'NotNull 'PGint4] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

207175 query = select Star (from (table #tab) & where_ (#col1 .> param @1))

208176in printSQL query

209177:}

@@ -213,21 +181,21 @@ aggregation query:

213181

214182>>> :{

215183let

216− query :: Query_ (Public Schema) () (Row Int64 Int32)

184+ query :: Query '[] '[] (Public Schema) '[] '["sum" ::: 'NotNull 'PGint4, "col1" ::: 'NotNull 'PGint4 ]

217185 query =

218− select_ ((fromNull 0 (sum_ (All #col2))) `as` #col1 :* #col1 `as` #col2)

186+ select_ (sum_ (All #col2) `as` #sum :* #col1)

219187 ( from (table (#tab `as` #table1))

220188 & groupBy #col1

221− & having (sum_ (Distinct #col2) .> 1) )

189+ & having (#col1 + sum_ (Distinct #col2) .> 1) )

222190in printSQL query

223191:}

224−SELECT COALESCE(sum(ALL "col2"), 0) AS "col1", "col1" AS "col2" FROM "tab" AS "table1" GROUP BY "col1" HAVING (sum(DISTINCT "col2") > 1)

192+SELECT sum(ALL "col2") AS "sum", "col1" AS "col1" FROM "tab" AS "table1" GROUP BY "col1" HAVING (("col1" + sum(DISTINCT "col2")) > 1)

225193

226194sorted query:

227195

228196>>> :{

229197let

230− query :: Query_ (Public Schema) () (Row Int32 Int32)

198+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

231199 query = select Star (from (table #tab) & orderBy [#col1 & Asc])

232200in printSQL query

233201:}

@@ -235,12 +203,14 @@ SELECT * FROM "tab" AS "tab" ORDER BY "col1" ASC

235203

236204joins:

237205

206+>>> :set -XFlexibleContexts

238207>>> :{

239208type OrdersColumns =

240209 '[ "id" ::: 'NoDef :=> 'NotNull 'PGint4

241− , "price" ::: 'NoDef :=> 'NotNull 'PGfloat4

242− , "customer_id" ::: 'NoDef :=> 'NotNull 'PGint4

243− , "shipper_id" ::: 'NoDef :=> 'NotNull 'PGint4 ]

210+ , "price" ::: 'NoDef :=> 'NotNull 'PGfloat4

211+ , "customer_id" ::: 'NoDef :=> 'NotNull 'PGint4

212+ , "shipper_id" ::: 'NoDef :=> 'NotNull 'PGint4

213+ ]

244214:}

245215

246216>>> :{

@@ -256,27 +226,22 @@ type OrdersConstraints =

256226>>> :{

257227type OrdersSchema =

258228 '[ "orders" ::: 'Table (OrdersConstraints :=> OrdersColumns)

259− , "customers" ::: 'Table (CustomersConstraints :=> NamesColumns)

260− , "shippers" ::: 'Table (ShippersConstraints :=> NamesColumns) ]

261−:}

262−

263−>>> :{

264−data Order = Order

265− { price :: Float

266− , customerName :: Text

267− , shipperName :: Text

268− } deriving GHC.Generic

269−instance SOP.Generic Order

270−instance SOP.HasDatatypeInfo Order

229+ , "customers" ::: 'Table (CustomersConstraints :=> NamesColumns)

230+ , "shippers" ::: 'Table (ShippersConstraints :=> NamesColumns) ]

271231:}

272232

273233>>> :{

274234let

275− query :: Query_ (Public OrdersSchema) () Order

235+ query :: Query '[] '[] (Public OrdersSchema)

236+ '[]

237+ '[ "order_price" ::: 'NotNull 'PGfloat4

238+ , "customer_name" ::: 'NotNull 'PGtext

239+ , "shipper_name" ::: 'NotNull 'PGtext

240+ ]

276241 query = select_

277− ( #o ! #price `as` #price :*

278− #c ! #name `as` #customerName :*

279− #s ! #name `as` #shipperName )

242+ ( #o ! #price `as` #order_price :*

243+ #c ! #name `as` #customer_name :*

244+ #s ! #name `as` #shipper_name )

280245 ( from (table (#orders `as` #o)

281246 & innerJoin (table (#customers `as` #c))

282247 (#o ! #customer_id .== #c ! #id)

@@ -284,16 +249,14 @@ let

284249 (#o ! #shipper_id .== #s ! #id)) )

285250in printSQL query

286251:}

287−SELECT "o"."price" AS "price", "c"."name" AS "customerName", "s"."name" AS "shipperName" FROM "orders" AS "o" INNER JOIN "customers" AS "c" ON ("o"."customer_id" = "c"."id") INNER JOIN "shippers" AS "s" ON ("o"."shipper_id" = "s"."id")

252+SELECT "o"."price" AS "order_price", "c"."name" AS "customer_name", "s"."name" AS "shipper_name" FROM "orders" AS "o" INNER JOIN "customers" AS "c" ON ("o"."customer_id" = "c"."id") INNER JOIN "shippers" AS "s" ON ("o"."shipper_id" = "s"."id")

288253

289254self-join:

290255

291256>>> :{

292257let

293− query :: Query_ (Public Schema) () (Row Int32 Int32)

294− query = select

295− (#t1 & DotStar)

296− (from (table (#tab `as` #t1) & crossJoin (table (#tab `as` #t2))))

258+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

259+ query = select (#t1 & DotStar) (from (table (#tab `as` #t1) & crossJoin (table (#tab `as` #t2))))

297260in printSQL query

298261:}

299262SELECT "t1".* FROM "tab" AS "t1" CROSS JOIN "tab" AS "t2"

@@ -302,19 +265,17 @@ value queries:

302265

303266>>> :{

304267let

305− query :: Query_ schemas () (Row String Bool)

306− query = values

307− ("true" `as` #col1 :* true `as` #col2)

308− ["false" `as` #col1 :* false `as` #col2]

268+ query :: Query '[] commons schemas '[] '["foo" ::: 'NotNull 'PGint2, "bar" ::: 'NotNull 'PGbool]

269+ query = values (1 `as` #foo :* true `as` #bar) [2 `as` #foo :* false `as` #bar]

309270in printSQL query

310271:}

311−SELECT * FROM (VALUES (E'true', TRUE), (E'false', FALSE)) AS t ("col1", "col2")

272+SELECT * FROM (VALUES (1, TRUE), (2, FALSE)) AS t ("foo", "bar")

312273

313274set operations:

314275

315276>>> :{

316277let

317− query :: Query_ (Public Schema) () (Row Int32 Int32)

278+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

318279 query = select Star (from (table #tab)) `unionAll` select Star (from (table #tab))

319280in printSQL query

320281:}

@@ -324,7 +285,7 @@ with queries:

324285

325286>>> :{

326287let

327− query :: Query_ (Public Schema) () (Row Int32 Int32)

288+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

328289 query = with (

329290 select Star (from (table #tab)) `as` #cte1 :>>

330291 select Star (from (common #cte1)) `as` #cte2

@@ -337,35 +298,40 @@ window function queries

337298

338299>>> :{

339300let

340− query :: Query_ (Public Schema) () (Row Int32 Int64)

301+ query :: Query '[] '[] (Public Schema) '[] ["col1" ::: 'NotNull 'PGint4, "rank" ::: 'NotNull 'PGint8]

341302 query = select

342− (#col1 & Also (rank `as` #col2 `Over` (partitionBy #col1 & orderBy [#col2 & Asc])))

303+ (#col1 & Also (rank `as` #rank `Over` (partitionBy #col1 & orderBy [#col2 & Asc])))

343304 (from (table #tab))

344305in printSQL query

345306:}

346−SELECT "col1" AS "col1", rank() OVER (PARTITION BY "col1" ORDER BY "col2" ASC) AS "col2" FROM "tab" AS "tab"

307+SELECT "col1" AS "col1", rank() OVER (PARTITION BY "col1" ORDER BY "col2" ASC) AS "rank" FROM "tab" AS "tab"

347308

348309correlated subqueries

349310

350311>>> :{

351312let

352− query :: Query_ (Public Schema) () (Only Int32)

313+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4]

353314 query =

354− select (#col1 `as` #fromOnly) (from (table (#tab `as` #t1))

315+ select #col1 (from (table (#tab `as` #t1))

355316 & where_ (exists (

356317 select Star (from (table (#tab `as` #t2))

357318 & where_ (#t2 ! #col2 .== #t1 ! #col1)))))

358319in printSQL query

359320:}

360−SELECT "col1" AS "fromOnly" FROM "tab" AS "t1" WHERE EXISTS (SELECT * FROM "tab" AS "t2" WHERE ("t2"."col2" = "t1"."col1"))

361−

321+SELECT "col1" AS "col1" FROM "tab" AS "t1" WHERE EXISTS (SELECT * FROM "tab" AS "t2" WHERE ("t2"."col2" = "t1"."col1"))

362322-}

363−type family Query_

323+newtype Query

324+ (outer :: FromType)

325+ (commons :: FromType)

364326 (schemas :: SchemasType)

365− (parameters :: Type)

366− (row :: Type) where

367− Query_ schemas params row =

368− Query '[] '[] schemas (TuplePG params) (RowPG row)

327+ (params :: [NullityType])

328+ (row :: RowType)

329+ = UnsafeQuery { renderQuery :: ByteString }

330+ deriving (GHC.Generic,Show,Eq,Ord,NFData)

331+instance RenderSQL (Query outer commons schemas params row) where renderSQL = renderQuery

332+

333+type family Query_ (schemas :: SchemasType) (params :: Type) (row :: Type) where

334+ Query_ schemas params row = Query '[] '[] schemas (TuplePG params) (RowPG row)

369335

370336-- | The results of two queries can be combined using the set operation

371337-- `union`. Duplicate rows are eliminated.

@@ -437,48 +403,35 @@ q1 `exceptAll` q2 = UnsafeQuery $

437403SELECT queries

438404-----------------------------------------}

439405

440−{- | The simplest kinds of `Selection` are `Star` and `DotStar` which

441−emits all columns that a `TableExpression` produces. A select `List`

442−is a list of `Expression`s. A `Selection` could be a list of

443−`WindowFunction`s `Over` `WindowDefinition`. `Additional` `Selection`s can

444−be selected with `Also`.

445−-}

446−data Selection outer commons grp schemas params from row where

406+data Selection outer grp commons schemas params from row where

407+ List

408+ :: SListI row

409+ => NP (Aliased (Expression outer grp commons schemas params from)) row

410+ -> Selection outer grp commons schemas params from row

447411 Star

448412 :: HasUnique tab from row

449− => Selection outer commons 'Ungrouped schemas params from row

450− -- ^ `HasUnique` table in the `FromClause`

413+ => Selection outer 'Ungrouped commons schemas params from row

451414 DotStar

452415 :: Has tab from row

453416 => Alias tab

454− -- ^ `Has` table with `Alias`

455− -> Selection outer commons 'Ungrouped schemas params from row

456− List

457− :: SListI row

458− => NP (Aliased (Expression outer commons grp schemas params from)) row

459− -- ^ `NP` list of `Aliased` `Expression`s

460− -> Selection outer commons grp schemas params from row

417+ -> Selection outer 'Ungrouped commons schemas params from row

418+ Also

419+ :: Selection outer grp commons schemas params from right

420+ -> Selection outer grp commons schemas params from left

421+ -> Selection outer grp commons schemas params from (Join left right)

461422 Over

462423 :: SListI row

463− => NP (Aliased (WindowFunction outer commons grp schemas params from)) row

464− -- ^ `NP` list of `Aliased` `WindowFunction`s

465− -> WindowDefinition outer commons grp schemas params from

466− -> Selection outer commons grp schemas params from row

467− Also

468− :: Selection outer commons grp schemas params from right

469− -- ^ `Additional` `Selection`

470− -> Selection outer commons grp schemas params from left

471− -> Selection outer commons grp schemas params from (Join left right)

472−instance Additional (Selection outer commons grp schemas params from) where

473− also = Also

424+ => NP (Aliased (WindowFunction outer grp commons schemas params from)) row

425+ -> WindowDefinition outer grp commons schemas params from

426+ -> Selection outer grp commons schemas params from row

474427instance (KnownSymbol col, row ~ '[col ::: ty])

475428 => Aliasable col

476− (Expression outer commons grp schemas params from ty)

477− (Selection outer commons grp schemas params from row) where

429+ (Expression outer grp commons schemas params from ty)

430+ (Selection outer grp commons schemas params from row) where

478431 expr `as` col = List (expr `as` col)

479432instance (Has tab (Join outer from) row0, Has col row0 ty, row1 ~ '[col ::: ty])

480433 => IsQualified tab col

481− (Selection outer commons 'Ungrouped schemas params from row1) where

434+ (Selection outer 'Ungrouped commons schemas params from row1) where

482435 tab ! col = tab ! col `as` col

483436instance

484437 ( Has tab (Join outer from) row0

@@ -486,11 +439,11 @@ instance

486439 , row1 ~ '[col ::: ty]

487440 , GroupedBy tab col bys )

488441 => IsQualified tab col

489− (Selection outer commons ('Grouped bys) schemas params from row1) where

442+ (Selection outer ('Grouped bys) commons schemas params from row1) where

490443 tab ! col = tab ! col `as` col

491444instance (HasUnique tab (Join outer from) row0, Has col row0 ty, row1 ~ '[col ::: ty])

492445 => IsLabel col

493− (Selection outer commons 'Ungrouped schemas params from row1) where

446+ (Selection outer 'Ungrouped commons schemas params from row1) where

494447 fromLabel = fromLabel @col `as` Alias

495448instance

496449 ( HasUnique tab (Join outer from) row0

@@ -498,10 +451,10 @@ instance

498451 , row1 ~ '[col ::: ty]

499452 , GroupedBy tab col bys )

500453 => IsLabel col

501− (Selection outer commons ('Grouped bys) schemas params from row1) where

454+ (Selection outer ('Grouped bys) commons schemas params from row1) where

502455 fromLabel = fromLabel @col `as` Alias

503456

504−instance RenderSQL (Selection outer commons grp schemas params from row) where

457+instance RenderSQL (Selection outer grp commons schemas params from row) where

505458 renderSQL = \case

506459 List list -> renderCommaSeparated (renderAliased renderSQL) list

507460 Star -> "*"

@@ -510,7 +463,7 @@ instance RenderSQL (Selection outer commons grp schemas params from row) where

510463 Over winFns winDef ->

511464 let

512465 renderOver

513− :: Aliased (WindowFunction outer commons grp schemas params from) field

466+ :: Aliased (WindowFunction outer grp commons schemas params from) field

514467 -> ByteString

515468 renderOver (winFn `As` col) = renderSQL winFn

516469 <+> "OVER" <+> parenthesized (renderSQL winDef)

@@ -519,7 +472,7 @@ instance RenderSQL (Selection outer commons grp schemas params from row) where

519472 renderCommaSeparated renderOver winFns

520473

521474instance IsString

522− (Selection outer commons grp schemas params from '["fromOnly" ::: 'NotNull 'PGtext]) where

475+ (Selection outer grp commons schemas params from '["fromOnly" ::: 'NotNull 'PGtext]) where

523476 fromString str = fromString str `as` Alias

524477

525478-- | the `TableExpression` in the `select` command constructs an intermediate

@@ -529,9 +482,9 @@ instance IsString

529482-- the intermediate table are actually output.

530483select

531484 :: (SListI row, row ~ (x ': xs))

532− => Selection outer commons grp schemas params from row

533− -- ^ selection

534− -> TableExpression outer commons grp schemas params from

485+ => Selection outer grp commons schemas params from row

486+ -- ^ select list

487+ -> TableExpression outer grp commons schemas params from

535488 -- ^ intermediate virtual table

536489 -> Query outer commons schemas params row

537490select selection tabexpr = UnsafeQuery $

@@ -539,24 +492,20 @@ select selection tabexpr = UnsafeQuery $

539492 <+> renderSQL selection

540493 <+> renderSQL tabexpr

541494

542−-- | Like `select` but takes an `NP` list of `Expression`s instead

543−-- of a general `Selection`.

544495select_

545496 :: (SListI row, row ~ (x ': xs))

546− => NP (Aliased (Expression outer commons grp schemas params from)) row

547− -- ^ select list

548− -> TableExpression outer commons grp schemas params from

549− -- ^ intermediate virtual table

497+ => NP (Aliased (Expression outer grp commons schemas params from)) row

498+ -> TableExpression outer grp commons schemas params from

550499 -> Query outer commons schemas params row

551−select_ = select . List

500+select_ list = select (List list)

552501

553502-- | After the select list has been processed, the result table can

554503-- be subject to the elimination of duplicate rows using `selectDistinct`.

555504selectDistinct

556505 :: (SListI columns, columns ~ (col ': cols))

557− => Selection outer commons grp schemas params from columns

558− -- ^ selection

559− -> TableExpression outer commons grp schemas params from

506+ => Selection outer 'Ungrouped commons schemas params from columns

507+ -- ^ select list

508+ -> TableExpression outer 'Ungrouped commons schemas params from

560509 -- ^ intermediate virtual table

561510 -> Query outer commons schemas params columns

562511selectDistinct selection tabexpr = UnsafeQuery $

@@ -564,65 +513,14 @@ selectDistinct selection tabexpr = UnsafeQuery $

564513 <+> renderSQL selection

565514 <+> renderSQL tabexpr

566515

567−-- | Like `selectDistinct` but takes an `NP` list of `Expression`s instead

568−-- of a general `Selection`.

569516selectDistinct_

570517 :: (SListI columns, columns ~ (col ': cols))

571− => NP (Aliased (Expression outer commons grp schemas params from)) columns

518+ => NP (Aliased (Expression outer 'Ungrouped commons schemas params from)) columns

572519 -- ^ select list

573− -> TableExpression outer commons grp schemas params from

574− -- ^ intermediate virtual table

575− -> Query outer commons schemas params columns

576−selectDistinct_ = selectDistinct . List

577−

578−{-|

579−`selectDistinctOn` keeps only the first row of each set of rows where

580−the given expressions evaluate to equal. The DISTINCT ON expressions are

581−interpreted using the same rules as for ORDER BY. ORDER BY is used to

582−ensure that the desired row appears first.

583−

584−The DISTINCT ON expression(s) must match the leftmost ORDER BY expression(s).

585−The ORDER BY clause will normally contain additional expression(s) that

586−determine the desired precedence of rows within each DISTINCT ON group.

587−

588−In order to guarantee they match and reduce redundancy, this function

589−will prepend the The DISTINCT ON expressions to the ORDER BY clause.

590−-}

591−selectDistinctOn

592− :: (SListI columns, columns ~ (col ': cols))

593− => [SortExpression outer commons grp schemas params from]

594− -- ^ DISTINCT ON expression(s) and prepended to ORDER BY clause

595− -> Selection outer commons grp schemas params from columns

596− -- ^ selection

597− -> TableExpression outer commons grp schemas params from

520+ -> TableExpression outer 'Ungrouped commons schemas params from

598521 -- ^ intermediate virtual table

599522 -> Query outer commons schemas params columns

600−selectDistinctOn distincts selection tab = UnsafeQuery $

601− "SELECT DISTINCT ON"

602− <+> parenthesized (commaSeparated (renderDistinctOn <$> distincts))

603− <+> renderSQL selection

604− <+> renderSQL (tab {orderByClause = distincts <> orderByClause tab})

605− where

606− renderDistinctOn = \case

607− Asc expression -> renderSQL expression

608− Desc expression -> renderSQL expression

609− AscNullsFirst expression -> renderSQL expression

610− DescNullsFirst expression -> renderSQL expression

611− AscNullsLast expression -> renderSQL expression

612− DescNullsLast expression -> renderSQL expression

613−

614−-- | Like `selectDistinctOn` but takes an `NP` list of `Expression`s instead

615−-- of a general `Selection`.

616−selectDistinctOn_

617− :: (SListI columns, columns ~ (col ': cols))

618− => [SortExpression outer commons grp schemas params from]

619− -- ^ distinct on and return the first row in ordering

620− -> NP (Aliased (Expression outer commons grp schemas params from)) columns

621− -- ^ selection

622− -> TableExpression outer commons grp schemas params from

623− -- ^ intermediate virtual table

624− -> Query outer commons schemas params columns

625−selectDistinctOn_ distincts = selectDistinctOn distincts . List

523+selectDistinct_ list = select (List list)

626524

627525-- | `values` computes a row value or set of row values

628526-- specified by value expressions. It is most commonly used

@@ -635,8 +533,8 @@ selectDistinctOn_ distincts = selectDistinctOn distincts . List

635533-- SELECT * FROM (VALUES (1, E'one')) AS t ("a", "b")

636534values

637535 :: SListI cols

638− => NP (Aliased (Expression outer commons 'Ungrouped schemas params '[] )) cols

639− -> [NP (Aliased (Expression outer commons 'Ungrouped schemas params '[] )) cols]

536+ => NP (Aliased (Expression outer 'Ungrouped commons schemas params '[] )) cols

537+ -> [NP (Aliased (Expression outer 'Ungrouped commons schemas params '[] )) cols]

640538 -- ^ When more than one row is specified, all the rows must

641539 -- must have the same number of elements

642540 -> Query outer commons schemas params cols

@@ -650,7 +548,7 @@ values rw rws = UnsafeQuery $ "SELECT * FROM"

650548 <+> parenthesized (renderCommaSeparated renderAliasPart rw)

651549 where

652550 renderAliasPart, renderValuePart

653− :: Aliased (Expression outer commons 'Ungrouped schemas params '[] ) ty -> ByteString

551+ :: Aliased (Expression outer 'Ungrouped commons schemas params '[] ) ty -> ByteString

654552 renderAliasPart (_ `As` name) = renderSQL name

655553 renderValuePart (value `As` _) = renderSQL value

656554

@@ -658,7 +556,7 @@ values rw rws = UnsafeQuery $ "SELECT * FROM"

658556-- specified by value expressions.

659557values_

660558 :: SListI cols

661− => NP (Aliased (Expression outer commons 'Ungrouped schemas params '[] )) cols

559+ => NP (Aliased (Expression outer 'Ungrouped commons schemas params '[] )) cols

662560 -- ^ one row of values

663561 -> Query outer commons schemas params cols

664562values_ rw = values rw []

@@ -675,8 +573,8 @@ Table Expressions

675573-- can be used to modify or combine base tables in various ways.

676574data TableExpression

677575 (outer :: FromType)

678− (commons :: FromType)

679576 (grp :: Grouping)

577+ (commons :: FromType)

680578 (schemas :: SchemasType)

681579 (params :: [NullityType])

682580 (from :: FromType)

@@ -684,7 +582,7 @@ data TableExpression

684582 { fromClause :: FromClause outer commons schemas params from

685583 -- ^ A table reference that can be a table name, or a derived table such

686584 -- as a subquery, a @JOIN@ construct, or complex combinations of these.

687− , whereClause :: [Condition outer commons 'Ungrouped schemas params from]

585+ , whereClause :: [Condition outer 'Ungrouped commons schemas params from]

688586 -- ^ optional search coditions, combined with `.&&`. After the processing

689587 -- of the `fromClause` is done, each row of the derived virtual table

690588 -- is checked against the search condition. If the result of the

@@ -700,13 +598,13 @@ data TableExpression

700598 -- set of rows having common values into one group row that represents all

701599 -- rows in the group. This is done to eliminate redundancy in the output

702600 -- and/or compute aggregates that apply to these groups.

703− , havingClause :: HavingClause outer commons grp schemas params from

601+ , havingClause :: HavingClause outer grp commons schemas params from

704602 -- ^ If a table has been grouped using `groupBy`, but only certain groups

705603 -- are of interest, the `havingClause` can be used, much like a

706604 -- `whereClause`, to eliminate groups from the result. Expressions in the

707605 -- `havingClause` can refer both to grouped expressions and to ungrouped

708606 -- expressions (which necessarily involve an aggregate function).

709− , orderByClause :: [SortExpression outer commons grp schemas params from]

607+ , orderByClause :: [SortExpression outer grp commons schemas params from]

710608 -- ^ The `orderByClause` is for optional sorting. When more than one

711609 -- `SortExpression` is specified, the later (right) values are used to sort

712610 -- rows that are equal according to the earlier (left) values.

@@ -723,7 +621,7 @@ data TableExpression

723621 } deriving (GHC.Generic)

724622

725623-- | Render a `TableExpression`

726−instance RenderSQL (TableExpression outer commons grp schemas params from) where

624+instance RenderSQL (TableExpression outer grp commons schemas params from) where

727625 renderSQL

728626 (TableExpression frm' whs' grps' hvs' srts' lims' offs') = mconcat

729627 [ "FROM ", renderSQL frm'

@@ -756,29 +654,29 @@ instance RenderSQL (TableExpression outer commons grp schemas params from) where

756654-- to match the left-to-right sequencing of their placement in SQL.

757655from

758656 :: FromClause outer commons schemas params from -- ^ table reference

759− -> TableExpression outer commons 'Ungrouped schemas params from

760−from tab = TableExpression tab [] noGroups NoHaving [] [] []

657+ -> TableExpression outer 'Ungrouped commons schemas params from

658+from tab = TableExpression tab [] NoGroups NoHaving [] [] []

761659

762660-- | A `where_` is an endomorphism of `TableExpression`s which adds a

763661-- search condition to the `whereClause`.

764662where_

765− :: Condition outer commons 'Ungrouped schemas params from -- ^ filtering condition

766− -> TableExpression outer commons grp schemas params from

767− -> TableExpression outer commons grp schemas params from

663+ :: Condition outer 'Ungrouped commons schemas params from -- ^ filtering condition

664+ -> TableExpression outer grp commons schemas params from

665+ -> TableExpression outer grp commons schemas params from

768666where_ wh rels = rels {whereClause = wh : whereClause rels}

769667

770668-- | A `groupBy` is a transformation of `TableExpression`s which switches

771−-- its `Grouping` from `Ungrouped` to `Grouped`. Use @groupBy Nil@ to perform

669+-- its `Grouping` from `Ungrouped` to `Grouped`. Use @group Nil@ to perform

772670-- a "grand total" aggregation query.

773671groupBy

774672 :: SListI bys

775673 => NP (By from) bys -- ^ grouped columns

776− -> TableExpression outer commons 'Ungrouped schemas params from

777− -> TableExpression outer commons ('Grouped bys) schemas params from

674+ -> TableExpression outer 'Ungrouped commons schemas params from

675+ -> TableExpression outer ('Grouped bys) commons schemas params from

778676groupBy bys rels = TableExpression

779677 { fromClause = fromClause rels

780678 , whereClause = whereClause rels

781− , groupByClause = group bys

679+ , groupByClause = Group bys

782680 , havingClause = Having []

783681 , orderByClause = []

784682 , limitClause = limitClause rels

@@ -788,9 +686,9 @@ groupBy bys rels = TableExpression

788686-- | A `having` is an endomorphism of `TableExpression`s which adds a

789687-- search condition to the `havingClause`.

790688having

791− :: Condition outer commons ('Grouped bys) schemas params from -- ^ having condition

792− -> TableExpression outer commons ('Grouped bys) schemas params from

793− -> TableExpression outer commons ('Grouped bys) schemas params from

689+ :: Condition outer ('Grouped bys) commons schemas params from -- ^ having condition

690+ -> TableExpression outer ('Grouped bys) commons schemas params from

691+ -> TableExpression outer ('Grouped bys) commons schemas params from

794692having hv rels = rels

795693 { havingClause = case havingClause rels of Having hvs -> Having (hv:hvs) }

796694

@@ -801,22 +699,190 @@ instance OrderBy TableExpression where

801699-- `limitClause`.

802700limit

803701 :: Word64 -- ^ limit parameter

804− -> TableExpression outer commons grp schemas params from

805− -> TableExpression outer commons grp schemas params from

702+ -> TableExpression outer grp commons schemas params from

703+ -> TableExpression outer grp commons schemas params from

806704limit lim rels = rels {limitClause = lim : limitClause rels}

807705

808706-- | An `offset` is an endomorphism of `TableExpression`s which adds to the

809707-- `offsetClause`.

810708offset

811709 :: Word64 -- ^ offset parameter

812− -> TableExpression outer commons grp schemas params from

813− -> TableExpression outer commons grp schemas params from

710+ -> TableExpression outer grp commons schemas params from

711+ -> TableExpression outer grp commons schemas params from

814712offset off rels = rels {offsetClause = off : offsetClause rels}

815713

714+{-----------------------------------------

715+JSON stuff

716+-----------------------------------------}

717+

718+unsafeSetOfFunction

719+ :: ByteString

720+ -> Expression outer 'Ungrouped commons schemas params '[] ty

721+ -> FromClause outer commons schemas params from

722+unsafeSetOfFunction fun expr = UnsafeFromClause $

723+ fun <> "(" <> renderSQL expr <> ")"

724+

725+-- | Expand an array to a set of rows

726+unnest

727+ :: Expression outer 'Ungrouped commons schemas params '[] (nullity ('PGvararray ty))

728+ -> FromClause outer commons schemas params '["unnest" ::: '["unnest" ::: ty]]

729+unnest = unsafeSetOfFunction "unnest"

730+

731+-- | Expands the outermost JSON object into a set of key/value pairs.

732+-- >>> import Data.Aeson

733+-- >>> printSQL (select Star (from (jsonEach (jsonLit (object ["a" .= "foo", "b" .= "bar"])))))

734+-- SELECT * FROM json_each(('{"a":"foo","b":"bar"}' :: json))

735+jsonEach

736+ :: Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjson) -- ^ json object

737+ -> FromClause outer commons schemas params

738+ '["json_each" ::: '["key" ::: 'NotNull 'PGtext, "value" ::: 'NotNull 'PGjson]]

739+jsonEach = unsafeSetOfFunction "json_each"

740+

741+-- | Expands the outermost binary JSON object into a set of key/value pairs.

742+-- >>> import Data.Aeson

743+-- >>> printSQL (select Star (from (jsonbEach (jsonbLit (object ["a" .= "foo", "b" .= "bar"])))))

744+-- SELECT * FROM jsonb_each(('{"a":"foo","b":"bar"}' :: jsonb))

745+jsonbEach

746+ :: Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjsonb) -- ^ jsonb object

747+ -> FromClause outer commons schemas params

748+ '["jsonb_each" ::: '["key" ::: 'NotNull 'PGtext, "value" ::: 'NotNull 'PGjson]]

749+jsonbEach = unsafeSetOfFunction "jsonb_each"

750+

751+-- | Expands the outermost JSON object into a set of key/value pairs.-- | Expands the outermost binary JSON object into a set of key/value pairs.

752+-- >>> import Data.Aeson

753+-- >>> printSQL (select Star (from (jsonEachText (jsonLit (object ["a" .= "foo", "b" .= "bar"])))))

754+-- SELECT * FROM json_each_text(('{"a":"foo","b":"bar"}' :: json))

755+jsonEachText

756+ :: Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjson) -- ^ json object

757+ -> FromClause outer commons schemas params

758+ '["json_each" ::: '["key" ::: 'NotNull 'PGtext, "value" ::: 'NotNull 'PGtext]]

759+jsonEachText = unsafeSetOfFunction "json_each_text"

760+

761+-- | Expands the outermost binary JSON object into a set of key/value pairs.

762+-- >>> import Data.Aeson

763+-- >>> printSQL (select Star (from (jsonbEachText (jsonbLit (object ["a" .= "foo", "b" .= "bar"])))))

764+-- SELECT * FROM jsonb_each_text(('{"a":"foo","b":"bar"}' :: jsonb))

765+jsonbEachText

766+ :: Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjsonb) -- ^ jsonb object

767+ -> FromClause outer commons schemas params

768+ '["jsonb_each" ::: '["key" ::: 'NotNull 'PGtext, "value" ::: 'NotNull 'PGtext]]

769+jsonbEachText = unsafeSetOfFunction "jsonb_each_text"

770+

771+-- | Returns set of keys in the outermost JSON object.

772+-- >>> import Data.Aeson

773+-- >>> printSQL (jsonObjectKeys (jsonLit (object ["a" .= "foo", "b" .= "bar"])))

774+-- json_object_keys(('{"a":"foo","b":"bar"}' :: json))

775+jsonObjectKeys

776+ :: Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjson) -- ^ json object

777+ -> FromClause outer commons schemas params

778+ '["json_object_keys" ::: '["json_object_keys" ::: 'NotNull 'PGtext]]

779+jsonObjectKeys = unsafeSetOfFunction "json_object_keys"

780+

781+-- | Returns set of keys in the outermost JSON object.

782+-- >>> import Data.Aeson

783+-- >>> printSQL (jsonbObjectKeys (jsonbLit (object ["a" .= "foo", "b" .= "bar"])))

784+-- jsonb_object_keys(('{"a":"foo","b":"bar"}' :: jsonb))

785+jsonbObjectKeys

786+ :: Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjsonb) -- ^ jsonb object

787+ -> FromClause outer commons schemas params

788+ '["jsonb_object_keys" ::: '["jsonb_object_keys" ::: 'NotNull 'PGtext]]

789+jsonbObjectKeys = unsafeSetOfFunction "jsonb_object_keys"

790+

791+unsafePopulateFunction

792+ :: KnownSymbol fun

793+ => Alias fun

794+ -> TypeExpression schemas (nullity ('PGcomposite row))

795+ -> Expression outer 'Ungrouped commons schemas params '[] ty

796+ -> FromClause outer commons schemas params '[fun ::: row]

797+unsafePopulateFunction fun ty expr = UnsafeFromClause $ renderSQL fun

798+ <> parenthesized ("null::" <> renderSQL ty <> ", " <> renderSQL expr)

799+

800+-- | Expands the JSON expression to a row whose columns match the record

801+-- type defined by the given table.

802+jsonPopulateRecord

803+ :: TypeExpression schemas (nullity ('PGcomposite row)) -- ^ row type

804+ -> Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjson) -- ^ json object

805+ -> FromClause outer commons schemas params '["json_populate_record" ::: row]

806+jsonPopulateRecord = unsafePopulateFunction #json_populate_record

807+

808+-- | Expands the binary JSON expression to a row whose columns match the record

809+-- type defined by the given table.

810+jsonbPopulateRecord

811+ :: TypeExpression schemas (nullity ('PGcomposite row)) -- ^ row type

812+ -> Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjsonb) -- ^ jsonb object

813+ -> FromClause outer commons schemas params '["jsonb_populate_record" ::: row]

814+jsonbPopulateRecord = unsafePopulateFunction #jsonb_populate_record

815+

816+-- | Expands the outermost array of objects in the given JSON expression to a

817+-- set of rows whose columns match the record type defined by the given table.

818+jsonPopulateRecordSet

819+ :: TypeExpression schemas (nullity ('PGcomposite row)) -- ^ row type

820+ -> Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjson) -- ^ json array

821+ -> FromClause outer commons schemas params '["json_populate_record_set" ::: row]

822+jsonPopulateRecordSet = unsafePopulateFunction #json_populate_record_set

823+

824+-- | Expands the outermost array of objects in the given binary JSON expression

825+-- to a set of rows whose columns match the record type defined by the given

826+-- table.

827+jsonbPopulateRecordSet

828+ :: TypeExpression schemas (nullity ('PGcomposite row)) -- ^ row type

829+ -> Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjsonb) -- ^ jsonb array

830+ -> FromClause outer commons schemas params '["jsonb_populate_record_set" ::: row]

831+jsonbPopulateRecordSet = unsafePopulateFunction #jsonb_populate_record_set

832+

833+unsafeRecordFunction

834+ :: (SListI record, json `In` PGJsonType)

835+ => ByteString

836+ -> Expression outer 'Ungrouped commons schemas params '[] (nullity json)

837+ -> Aliased (NP (Aliased (TypeExpression schemas))) (tab ::: record)

838+ -> FromClause outer commons schemas params '[tab ::: record]

839+unsafeRecordFunction fun expr (types `As` tab) = UnsafeFromClause $

840+ fun <> parenthesized (renderSQL expr) <+> "AS" <+> renderSQL tab

841+ <> parenthesized (renderCommaSeparated renderTy types)

842+ where

843+ renderTy :: Aliased (TypeExpression schemas) ty -> ByteString

844+ renderTy (ty `As` alias) = renderSQL alias <+> renderSQL ty

845+

846+-- | Builds an arbitrary record from a JSON object.

847+jsonToRecord

848+ :: SListI record

849+ => Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjson) -- ^ json object

850+ -> Aliased (NP (Aliased (TypeExpression schemas))) (tab ::: record)

851+ -> FromClause outer commons schemas params '[tab ::: record]

852+jsonToRecord = unsafeRecordFunction "json_to_record"

853+

854+-- | Builds an arbitrary record from a binary JSON object.

855+jsonbToRecord

856+ :: SListI record

857+ => Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjsonb) -- ^ jsonb object

858+ -> Aliased (NP (Aliased (TypeExpression schemas))) (tab ::: record)

859+ -> FromClause outer commons schemas params '[tab ::: record]

860+jsonbToRecord = unsafeRecordFunction "jsonb_to_record"

861+

862+-- | Builds an arbitrary set of records from a JSON array of objects.

863+jsonToRecordSet

864+ :: SListI record

865+ => Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjson) -- ^ json array

866+ -> Aliased (NP (Aliased (TypeExpression schemas))) (tab ::: record)

867+ -> FromClause outer commons schemas params '[tab ::: record]

868+jsonToRecordSet = unsafeRecordFunction "json_to_record_set"

869+

870+-- | Builds an arbitrary set of records from a binary JSON array of objects.

871+jsonbToRecordSet

872+ :: SListI record

873+ => Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjsonb) -- ^ jsonb array

874+ -> Aliased (NP (Aliased (TypeExpression schemas))) (tab ::: record)

875+ -> FromClause outer commons schemas params '[tab ::: record]

876+jsonbToRecordSet = unsafeRecordFunction "jsonb_to_record_set"

877+

816878{-----------------------------------------

817879FROM clauses

818880-----------------------------------------}

819881

882+type family FromClause_ schemas params from where

883+ FromClause_ schemas params from =

884+ FromClause schemas (TuplePG params) (FromPG from)

885+

820886{- |

821887A `FromClause` can be a table name, or a derived table such

822888as a subquery, a @JOIN@ construct, or complex combinations of these.

@@ -839,7 +905,7 @@ table (tab `As` alias) = UnsafeFromClause $

839905subquery

840906 :: Aliased (Query outer commons schemas params) query

841907 -> FromClause outer commons schemas params '[query]

842−subquery = UnsafeFromClause . renderAliased (parenthesized . renderSQL)

908+subquery = UnsafeFromClause . renderAliased (parenthesized . renderQuery)

843909

844910-- | `view` derives a table from a `View`.

845911view

@@ -857,16 +923,11 @@ common

857923common (cte `As` alias) = UnsafeFromClause $

858924 renderSQL cte <+> "AS" <+> renderSQL alias

859925

860−instance Additional (FromClause outer commons schemas params) where

861− also right left = UnsafeFromClause $

862− renderSQL left <> ", " <> renderSQL right

863−

864−{- |

865−@left & crossJoin right@. For every possible combination of rows from

866−@left@ and @right@ (i.e., a Cartesian product), the joined table will contain

867−a row consisting of all columns in @left@ followed by all columns in @right@.

868−If the tables have @n@ and @m@ rows respectively, the joined table will

869−have @n * m@ rows.

926+{- | @left & crossJoin right@. For every possible combination of rows from

927+ @left@ and @right@ (i.e., a Cartesian product), the joined table will contain

928+ a row consisting of all columns in @left@ followed by all columns in @right@.

929+ If the tables have @n@ and @m@ rows respectively, the joined table will

930+ have @n * m@ rows.

870931-}

871932crossJoin

872933 :: FromClause outer commons schemas params right

@@ -883,7 +944,7 @@ the @on@ condition.

883944innerJoin

884945 :: FromClause outer commons schemas params right

885946 -- ^ right

886− -> Condition outer commons 'Ungrouped schemas params (Join left right)

947+ -> Condition outer 'Ungrouped commons schemas params (Join left right)

887948 -- ^ @on@ condition

888949 -> FromClause outer commons schemas params left

889950 -- ^ left

@@ -900,7 +961,7 @@ innerJoin right on left = UnsafeFromClause $

900961leftOuterJoin

901962 :: FromClause outer commons schemas params right

902963 -- ^ right

903− -> Condition outer commons 'Ungrouped schemas params (Join left right)

964+ -> Condition outer 'Ungrouped commons schemas params (Join left right)

904965 -- ^ @on@ condition

905966 -> FromClause outer commons schemas params left

906967 -- ^ left

@@ -918,7 +979,7 @@ leftOuterJoin right on left = UnsafeFromClause $

918979rightOuterJoin

919980 :: FromClause outer commons schemas params right

920981 -- ^ right

921− -> Condition outer commons 'Ungrouped schemas params (Join left right)

982+ -> Condition outer 'Ungrouped commons schemas params (Join left right)

922983 -- ^ @on@ condition

923984 -> FromClause outer commons schemas params left

924985 -- ^ left

@@ -937,7 +998,7 @@ rightOuterJoin right on left = UnsafeFromClause $

937998fullOuterJoin

938999 :: FromClause outer commons schemas params right

9391000 -- ^ right

940− -> Condition outer commons 'Ungrouped schemas params (Join left right)

1001+ -> Condition outer 'Ungrouped commons schemas params (Join left right)

9411002 -- ^ @on@ condition

9421003 -> FromClause outer commons schemas params left

9431004 -- ^ left

@@ -992,42 +1053,125 @@ instance (Has rel rels cols, Has col cols ty, bys ~ '[ '(rel, col)])

9921053-- done on @NoGroups@ while all output `Expression`s must be aggregated

9931054-- in @Group Nil@. In general, all output `Expression`s in the

9941055-- complement of @bys@ must be aggregated in @Group bys@.

995−newtype GroupByClause grp from = UnsafeGroupByClause

996− { renderGroupByClause :: ByteString }

997− deriving (GHC.Generic,Show,Eq,Ord,NFData)

1056+data GroupByClause grp from where

1057+ NoGroups :: GroupByClause 'Ungrouped from

1058+ Group

1059+ :: SListI bys

1060+ => NP (By from) bys

1061+ -> GroupByClause ('Grouped bys) from

1062+

1063+-- | Renders a `GroupByClause`.

9981064instance RenderSQL (GroupByClause grp from) where

999− renderSQL = renderGroupByClause

1000−noGroups :: GroupByClause 'Ungrouped from

1001−noGroups = UnsafeGroupByClause ""

1002−group

1003− :: SListI bys

1004− => NP (By from) bys

1005− -> GroupByClause ('Grouped bys) from

1006−group bys = UnsafeGroupByClause $ case bys of

1007− Nil -> ""

1008− bys' -> " GROUP BY" <+> renderCommaSeparated renderSQL bys'

1065+ renderSQL = \case

1066+ NoGroups -> ""

1067+ Group Nil -> ""

1068+ Group bys -> " GROUP BY" <+> renderCommaSeparated renderSQL bys

10091069

10101070-- | A `HavingClause` is used to eliminate groups that are not of interest.

10111071-- An `Ungrouped` `TableExpression` may only use `NoHaving` while a `Grouped`

10121072-- `TableExpression` must use `Having` whose conditions are combined with

10131073-- `.&&`.

1014−data HavingClause outer commons grp schemas params from where

1015− NoHaving :: HavingClause outer commons 'Ungrouped schemas params from

1074+data HavingClause outer grp commons schemas params from where

1075+ NoHaving :: HavingClause outer 'Ungrouped commons schemas params from

10161076 Having

1017− :: [Condition outer commons ('Grouped bys) schemas params from]

1018− -> HavingClause outer commons ('Grouped bys) schemas params from

1019−deriving instance Show (HavingClause outer commons grp schemas params from)

1020−deriving instance Eq (HavingClause outer commons grp schemas params from)

1021−deriving instance Ord (HavingClause outer commons grp schemas params from)

1077+ :: [Condition outer ('Grouped bys) commons schemas params from]

1078+ -> HavingClause outer ('Grouped bys) commons schemas params from

1079+deriving instance Show (HavingClause outer grp commons schemas params from)

1080+deriving instance Eq (HavingClause outer grp commons schemas params from)

1081+deriving instance Ord (HavingClause outer grp commons schemas params from)

10221082

10231083-- | Render a `HavingClause`.

1024−instance RenderSQL (HavingClause outer commons grp schemas params from) where

1084+instance RenderSQL (HavingClause outer grp commons schemas params from) where

10251085 renderSQL = \case

10261086 NoHaving -> ""

10271087 Having [] -> ""

10281088 Having conditions ->

10291089 " HAVING" <+> commaSeparated (renderSQL <$> conditions)

10301090

1091+{- |

1092+The argument of `exists` is an arbitrary subquery. The subquery is evaluated

1093+to determine whether it returns any rows. If it returns at least one row,

1094+the result of `exists` is `true`; if the subquery returns no rows,

1095+the result of `exists` is `false`.

1096+

1097+The subquery can refer to variables from the surrounding query,

1098+which will act as constants during any one evaluation of the subquery.

1099+

1100+The subquery will generally only be executed long enough to determine whether

1101+at least one row is returned, not all the way to completion.

1102+-}

1103+exists

1104+ :: Query (Join outer from) commons schemas params row

1105+ -> Condition outer grp commons schemas params from

1106+exists query = UnsafeExpression $ "EXISTS" <+> parenthesized (renderSQL query)

1107+

1108+{- |

1109+The right-hand side is a parenthesized subquery, which must return

1110+exactly one column. The left-hand expression is evaluated and compared to each

1111+row of the subquery result using the given `Operator`,

1112+which must yield a Boolean result. The result of `subAll` is `true`

1113+if all rows yield true (including the case where the subquery returns no rows).

1114+The result is `false` if any `false` result is found.

1115+The result is `null_` if no comparison with a subquery row returns `false`,

1116+and at least one comparison returns `null_`.

1117+

1118+>>> printSQL $ subAll true (.==) (values_ (true `as` #foo))

1119+(TRUE = ALL (SELECT * FROM (VALUES (TRUE)) AS t ("foo")))

1120+-}

1121+subAll

1122+ :: Expression outer grp commons schemas params from ty1 -- ^ expression

1123+ -> Operator ty1 ty2 ('Null 'PGbool) -- ^ operator

1124+ -> Query (Join outer from) commons schemas params '[col ::: ty2] -- ^ subquery

1125+ -> Condition outer grp commons schemas params from

1126+subAll expr (?) qry = expr ?

1127+ (UnsafeExpression $ "ALL" <+> parenthesized (renderSQL qry))

1128+

1129+{- |

1130+The right-hand side is a parenthesized subquery, which must return exactly one column.

1131+The left-hand expression is evaluated and compared to each row of the subquery result

1132+using the given `Operator`, which must yield a Boolean result. The result of `subAny` is `true`

1133+if any `true` result is obtained. The result is `false` if no true result is found

1134+(including the case where the subquery returns no rows).

1135+

1136+>>> printSQL $ subAll "foo" like (values_ ("foobar" `as` #foo))

1137+(E'foo' LIKE ALL (SELECT * FROM (VALUES (E'foobar')) AS t ("foo")))

1138+-}

1139+subAny

1140+ :: Expression outer grp commons schemas params from ty1 -- ^ expression

1141+ -> Operator ty1 ty2 ('Null 'PGbool) -- ^ operator

1142+ -> Query (Join outer from) commons schemas params '[col ::: ty2] -- ^ subquery

1143+ -> Condition outer grp commons schemas params from

1144+subAny expr (?) qry = expr ?

1145+ (UnsafeExpression $ "ANY" <+> parenthesized (renderSQL qry))

1146+

1147+{- |

1148+The result is `true` if the left-hand expression's result is equal

1149+to any of the right-hand expressions.

1150+

1151+>>> printSQL $ true `in_` [true, false, null_]

1152+TRUE IN (TRUE, FALSE, NULL)

1153+-}

1154+in_

1155+ :: Expression outer grp commons schemas params from ty -- ^ expression

1156+ -> [Expression outer grp commons schemas params from ty]

1157+ -> Condition outer grp commons schemas params from

1158+expr `in_` exprs = UnsafeExpression $ renderSQL expr <+> "IN"

1159+ <+> parenthesized (commaSeparated (renderSQL <$> exprs))

1160+

1161+{- |

1162+The result is `true` if the left-hand expression's result is not equal

1163+to any of the right-hand expressions.

1164+

1165+>>> printSQL $ true `notIn` [false, null_]

1166+TRUE NOT IN (FALSE, NULL)

1167+-}

1168+notIn

1169+ :: Expression outer grp commons schemas params from ty -- ^ expression

1170+ -> [Expression outer grp commons schemas params from ty]

1171+ -> Condition outer grp commons schemas params from

1172+expr `notIn` exprs = UnsafeExpression $ renderSQL expr <+> "NOT IN"

1173+ <+> parenthesized (commaSeparated (renderSQL <$> exprs))

1174+

10311175-- | A `CommonTableExpression` is an auxiliary statement in a `with` clause.

10321176data CommonTableExpression statement

10331177 (schemas :: SchemasType)

@@ -1049,8 +1193,8 @@ instance

10491193 , commons1 ~ (cte ::: common ': commons)

10501194 ) => Aliasable cte

10511195 (statement commons schemas params common)

1052− (Path (CommonTableExpression statement schemas params) commons commons1) where

1053− statement `as` cte = csingleton (statement `as` cte)

1196+ (AlignedList (CommonTableExpression statement schemas params) commons commons1) where

1197+ statement `as` cte = single (statement `as` cte)

10541198

10551199instance (forall c s p r. RenderSQL (statement c s p r)) => RenderSQL

10561200 (CommonTableExpression statement schemas params commons0 commons1) where

@@ -1062,7 +1206,7 @@ instance (forall c s p r. RenderSQL (statement c s p r)) => RenderSQL

10621206-- defining temporary tables that exist just for one query.

10631207class With statement where

10641208 with

1065− :: Path (CommonTableExpression statement schemas params) commons0 commons1

1209+ :: AlignedList (CommonTableExpression statement schemas params) commons0 commons1

10661210 -- ^ common table expressions

10671211 -> statement commons1 schemas params row

10681212 -- ^ larger query

@@ -1070,29 +1214,4 @@ class With statement where

10701214instance With (Query outer) where

10711215 with Done query = query

10721216 with ctes query = UnsafeQuery $

1073− "WITH" <+> commaSeparated (ctoList renderSQL ctes) <+> renderSQL query

1074−

1075−{- |

1076−>>> import Data.Monoid (Sum (..))

1077−>>> import Data.Int (Int64)

1078−>>> :{

1079− let

1080− query :: Query_ schema () (Sum Int64)

1081− query = withRecursive

1082− ( values_ ((1 & astype int) `as` #n)

1083− `unionAll`

1084− select_ ((#n + 1) `as` #n)

1085− (from (common #t) & where_ (#n .< 100)) `as` #t )

1086− ( select_ (fromNull 0 (sum_ (All #n)) `as` #getSum) (from (common #t) & groupBy Nil))

1087− in printSQL query

1088−:}

1089−WITH RECURSIVE "t" AS ((SELECT * FROM (VALUES ((1 :: int))) AS t ("n")) UNION ALL (SELECT ("n" + 1) AS "n" FROM "t" AS "t" WHERE ("n" < 100))) SELECT COALESCE(sum(ALL "n"), 0) AS "getSum" FROM "t" AS "t"

1090−-}

1091−withRecursive

1092− :: Aliased (Query outer (recursive ': commons) schemas params) recursive

1093− -> Query outer (recursive ': commons) schemas params row

1094− -> Query outer commons schemas params row

1095−withRecursive (recursive `As` cte) query = UnsafeQuery $

1096− "WITH RECURSIVE" <+> renderSQL cte

1097− <+> "AS" <+> parenthesized (renderSQL recursive)

1098− <+> renderSQL query

1217+ "WITH" <+> renderSQL ctes <+> renderSQL query

squeal-postgresql/src/Squeal/PostgreSQL/Render.hs+6−39

@@ -10,37 +10,31 @@ Rendering helper functions.

1010

1111{-# LANGUAGE

1212 AllowAmbiguousTypes

13− , ConstraintKinds

1413 , FlexibleContexts

15− , LambdaCase

1614 , MagicHash

1715 , OverloadedStrings

1816 , PolyKinds

1917 , RankNTypes

2018 , ScopedTypeVariables

21− , TypeApplications

2219#-}

2320

2421module Squeal.PostgreSQL.Render

2522 ( -- * Render

26− RenderSQL (..)

27− , printSQL

28− , escape

29− , parenthesized

30− , bracketed

23+ parenthesized

3124 , (<+>)

3225 , commaSeparated

3326 , doubleQuoted

3427 , singleQuotedText

3528 , singleQuotedUtf8

3629 , renderCommaSeparated

37− , renderCommaSeparatedConstraint

3830 , renderCommaSeparatedMaybe

3931 , renderNat

4032 , renderSymbol

33+ , RenderSQL (..)

34+ , printSQL

4135 ) where

4236

43−import Control.Monad.IO.Class (MonadIO (..))

37+import Control.Monad.Base

4438import Data.ByteString (ByteString)

4539import Data.Maybe (catMaybes)

4640import Data.Monoid ((<>))

@@ -58,10 +52,6 @@ import qualified Data.ByteString.Char8 as Char8

5852parenthesized :: ByteString -> ByteString

5953parenthesized str = "(" <> str <> ")"

6054

61−-- | Square bracket a `ByteString`

62−bracketed :: ByteString -> ByteString

63−bracketed str = "[" <> str <> "]"

64−

6555-- | Concatenate two `ByteString`s with a space between.

6656(<+>) :: ByteString -> ByteString -> ByteString

6757infixr 7 <+>

@@ -94,16 +84,6 @@ renderCommaSeparated render

9484 . hcollapse

9585 . hmap (K . render)

9686

97−-- | Comma separate the renderings of a heterogeneous list.

98−renderCommaSeparatedConstraint

99− :: forall c xs expression. (All c xs, SListI xs)

100− => (forall x. c x => expression x -> ByteString)

101− -> NP expression xs -> ByteString

102−renderCommaSeparatedConstraint render

103− = commaSeparated

104− . hcollapse

105− . hcmap (Proxy @c) (K . render)

106−

10787-- | Comma separate the `Maybe` renderings of a heterogeneous list, dropping

10888-- `Nothing`s.

10989renderCommaSeparatedMaybe

@@ -128,18 +108,5 @@ renderSymbol = fromString (symbolVal' (proxy# :: Proxy# s))

128108class RenderSQL sql where renderSQL :: sql -> ByteString

129109

130110-- | Print SQL.

131−printSQL :: (RenderSQL sql, MonadIO io) => sql -> io ()

132−printSQL = liftIO . Char8.putStrLn . renderSQL

133−

134−-- | `escape` a character to prevent injection

135−escape :: Char -> String

136−escape = \case

137− '\NUL' -> "\\0"

138− '\'' -> "''"

139− '"' -> "\\\""

140− '\b' -> "\\b"

141− '\n' -> "\\n"

142− '\r' -> "\\r"

143− '\t' -> "\\t"

144− '\\' -> "\\\\"

145− c -> [c]

111+printSQL :: (RenderSQL sql, MonadBase IO io) => sql -> io ()

112+printSQL = liftBase . Char8.putStrLn . renderSQL

squeal-postgresql/src/Squeal/PostgreSQL/Schema.hs+372−180

@@ -1,15 +1,16 @@

11{-|

22Module: Squeal.PostgreSQL.Schema

33Description: Embedding of PostgreSQL type and alias system

4−Copyright: (c) Eitan Chatav, 2019

4+Copyright: (c) Eitan Chatav, 2017

55Maintainer: eitan@morphism.tech

66Stability: experimental

8−`Squeal.PostgreSQL.Schema` provides a type-level DSL for kinds of Postgres types,

8+This module provides a type-level DSL for kinds of Postgres types,

99tables, schema, constraints, aliases, enumerated labels, and groupings.

1010It also defines useful type families to operate on these. Finally,

1111it defines an embedding of Haskell types into Postgres types.

1212-}

13+{-# OPTIONS_GHC -fno-warn-unticked-promoted-constructors #-}

1314{-# LANGUAGE

1415 AllowAmbiguousTypes

1516 , ConstraintKinds

@@ -44,10 +45,6 @@ module Squeal.PostgreSQL.Schema

4445 , ColumnsType

4546 , TableType

4647 , SchemumType (..)

47− , IndexType (..)

48− , FunctionType

49− , OperatorType (..)

50− , ReturnsType (..)

5148 , SchemaType

5249 , SchemasType

5350 , Public

@@ -57,30 +54,52 @@ module Squeal.PostgreSQL.Schema

5754 , TableConstraint (..)

5855 , TableConstraints

5956 , Uniquely

57+ -- * Aliases

58+ , (:::)

59+ , Alias (..)

60+ , IsLabel (..)

61+ , Aliased (As)

62+ , Aliasable (as)

63+ , renderAliased

64+ , Has

65+ , HasUnique

66+ , HasAll

67+ , QualifiedAlias (..)

68+ , IsQualified (..)

69+ , HasIn

70+ , IsNotElem

71+ , AllUnique

72+ , DefaultAliasable (..)

6073 -- * Enumerated Labels

6174 , IsPGlabel (..)

6275 , PGlabel (..)

76+ -- * Grouping

77+ , Grouping (..)

78+ , GroupedBy

79+ -- * Aligned lists

80+ , AlignedList (..)

81+ , single

6382 -- * Data Definitions

6483 , Create

65− , CreateIfNotExists

66− , CreateOrReplace

6784 , Drop

68− , DropSchemum

69− , DropIfExists

70− , DropSchemumIfExists

7185 , Alter

72− , AlterIfExists

7386 , Rename

74− , RenameIfExists

75− , ConstraintInvolves

7687 , DropIfConstraintsInvolve

77− , IsNotElem

78− , AllUnique

88+ -- * Lists

89+ , Join

90+ , disjoin

91+ , Elem

92+ , In

93+ , Length

7994 -- * Type Classifications

95+ , HasOid (..)

8096 , PGNum

8197 , PGIntegral

8298 , PGFloating

8399 , PGTypeOf

100+ , PGArrayOf

101+ , PGArray

102+ , PGTextArray

84103 , PGJsonType

85104 , PGJsonKey

86105 , SamePGType

@@ -97,22 +116,25 @@ module Squeal.PostgreSQL.Schema

97116 ) where

98117

99118import Control.Category

119+import Control.DeepSeq

120+import Data.ByteString (ByteString)

100121import Data.Kind

101122import Data.Monoid hiding (All)

123+import Data.String

102124import Data.Type.Bool

125+import Data.Word (Word32)

103126import Generics.SOP

127+import GHC.OverloadedLabels

104128import GHC.TypeLits

105129import Prelude hiding (id, (.))

106130

107−import Squeal.PostgreSQL.Alias

108−import Squeal.PostgreSQL.List

109−import Squeal.PostgreSQL.Render

131+import qualified GHC.Generics as GHC

110132

111−-- $setup

112−-- >>> import Squeal.PostgreSQL

133+import Squeal.PostgreSQL.Render

113134

114135-- | `PGType` is the promoted datakind of PostgreSQL types.

115136--

137+-- >>> import Squeal.PostgreSQL.Schema

116138-- >>> :kind 'PGbool

117139-- 'PGbool :: PGType

118140data PGType

@@ -143,11 +165,37 @@ data PGType

143165 | PGenum [Symbol] -- ^ enumerated (enum) types are data types that comprise a static, ordered set of values.

144166 | PGcomposite RowType -- ^ a composite type represents the structure of a row or record; it is essentially just a list of field names and their data types.

145167 | PGtsvector -- ^ A tsvector value is a sorted list of distinct lexemes, which are words that have been normalized to merge different variants of the same word.

146− | PGtsquery -- ^ A tsquery value stores lexemes that are to be searched for.

147− | PGoid -- Object identifiers (OIDs) are used internally by PostgreSQL as primary keys for various system tables.

148− | PGrange PGType -- ^ Range types are data types representing a range of values of some element type (called the range's subtype).

168+ | PGtsquery -- ^ A tsquery value stores lexemes that are to be searched for

149169 | UnsafePGType Symbol -- ^ an escape hatch for unsupported PostgreSQL types

150170

171+-- | The object identifier of a `PGType`.

172+--

173+-- >>> :set -XTypeApplications

174+-- >>> oid @'PGbool

175+-- 16

176+class HasOid (ty :: PGType) where oid :: Word32

177+instance HasOid 'PGbool where oid = 16

178+instance HasOid 'PGint2 where oid = 21

179+instance HasOid 'PGint4 where oid = 23

180+instance HasOid 'PGint8 where oid = 20

181+instance HasOid 'PGnumeric where oid = 1700

182+instance HasOid 'PGfloat4 where oid = 700

183+instance HasOid 'PGfloat8 where oid = 701

184+instance HasOid ('PGchar n) where oid = 18

185+instance HasOid ('PGvarchar n) where oid = 1043

186+instance HasOid 'PGtext where oid = 25

187+instance HasOid 'PGbytea where oid = 17

188+instance HasOid 'PGtimestamp where oid = 1114

189+instance HasOid 'PGtimestamptz where oid = 1184

190+instance HasOid 'PGdate where oid = 1082

191+instance HasOid 'PGtime where oid = 1083

192+instance HasOid 'PGtimetz where oid = 1266

193+instance HasOid 'PGinterval where oid = 1186

194+instance HasOid 'PGuuid where oid = 2950

195+instance HasOid 'PGinet where oid = 869

196+instance HasOid 'PGjson where oid = 114

197+instance HasOid 'PGjsonb where oid = 3802

198+

151199-- | `NullityType` encodes the potential presence or definite absence of a

152200-- @NULL@ allowing operations which are sensitive to such to be well typed.

153201--

@@ -166,6 +214,11 @@ data NullityType

166214type (:=>) constraint ty = '(constraint,ty)

167215infixr 7 :=>

168216

217+-- | The alias operator `:::` is like a promoted version of `As`,

218+-- a type level pair between an alias and some type.

219+type (:::) (alias :: Symbol) ty = '(alias,ty)

220+infixr 6 :::

221+

169222-- | `ColumnConstraint` encodes the availability of @DEFAULT@ for inserts and updates.

170223-- A column can be assigned a default value.

171224-- A data `Squeal.PostgreSQL.Manipulations.Manipulation` command can also

@@ -260,19 +313,9 @@ type FromType = [(Symbol,RowType)]

260313

261314-- | `ColumnsToRow` removes column constraints.

262315type family ColumnsToRow (columns :: ColumnsType) :: RowType where

263− ColumnsToRow (column ::: _ :=> ty ': column1 ::: _ :=> ty1 ': column2 ::: _ :=> ty2 ': column3 ::: _ :=> ty3 ': column4 ::: _ :=> ty4 ': column5 ::: _ :=> ty5 ': columns) =

264− column ::: ty ': column1 ::: ty1 ': column2 ::: ty2 ': column3 ::: ty3 ': column4 ::: ty4 ': column5 ::: ty5 ': ColumnsToRow columns

265− ColumnsToRow (column ::: _ :=> ty ': column1 ::: _ :=> ty1 ': column2 ::: _ :=> ty2 ': column3 ::: _ :=> ty3 ': column4 ::: _ :=> ty4 ': columns) =

266− column ::: ty ': column1 ::: ty1 ': column2 ::: ty2 ': column3 ::: ty3 ': column4 ::: ty4 ': ColumnsToRow columns

267− ColumnsToRow (column ::: _ :=> ty ': column1 ::: _ :=> ty1 ': column2 ::: _ :=> ty2 ': column3 ::: _ :=> ty3 ': columns) =

268− column ::: ty ': column1 ::: ty1 ': column2 ::: ty2 ': column3 ::: ty3 ': ColumnsToRow columns

269− ColumnsToRow (column ::: _ :=> ty ': column1 ::: _ :=> ty1 ': column2 ::: _ :=> ty2 ': columns) =

270− column ::: ty ': column1 ::: ty1 ': column2 ::: ty2 ': ColumnsToRow columns

271− ColumnsToRow (column ::: _ :=> ty ': column1 ::: _ :=> ty1 ': columns) =

272− column ::: ty ': column1 ::: ty1 ': ColumnsToRow columns

273− ColumnsToRow (column ::: _ :=> ty ': columns) =

274− column ::: ty ': ColumnsToRow columns

275316 ColumnsToRow '[] = '[]

317+ ColumnsToRow (column ::: constraint :=> ty ': columns) =

318+ column ::: ty ': ColumnsToRow columns

276319

277320-- | `TableToColumns` removes table constraints.

278321type family TableToColumns (table :: TableType) :: ColumnsType where

@@ -282,6 +325,212 @@ type family TableToColumns (table :: TableType) :: ColumnsType where

282325type family TableToRow (table :: TableType) :: RowType where

283326 TableToRow tab = ColumnsToRow (TableToColumns tab)

284327

328+-- | `Grouping` is an auxiliary namespace, created by

329+-- @GROUP BY@ clauses (`Squeal.PostgreSQL.Query.group`), and used

330+-- for typesafe aggregation

331+data Grouping

332+ = Ungrouped -- ^ no aggregation permitted

333+ | Grouped [(Symbol,Symbol)] -- ^ aggregation required for any column which is not grouped

334+

335+{- | A `GroupedBy` constraint indicates that a table qualified column is

336+a member of the auxiliary namespace created by @GROUP BY@ clauses and thus,

337+may be called in an output `Squeal.PostgreSQL.Expression.Expression` without aggregating.

338+-}

339+class (KnownSymbol table, KnownSymbol column)

340+ => GroupedBy table column bys where

341+instance {-# OVERLAPPING #-} (KnownSymbol table, KnownSymbol column)

342+ => GroupedBy table column ('(table,column) ': bys)

343+instance {-# OVERLAPPABLE #-}

344+ ( KnownSymbol table

345+ , KnownSymbol column

346+ , GroupedBy table column bys

347+ ) => GroupedBy table column (tabcol ': bys)

348+

349+-- | `Alias`es are proxies for a type level string or `Symbol`

350+-- and have an `IsLabel` instance so that with @-XOverloadedLabels@

351+--

352+-- >>> :set -XOverloadedLabels

353+-- >>> #foobar :: Alias "foobar"

354+-- Alias

355+data Alias (alias :: Symbol) = Alias

356+ deriving (Eq,GHC.Generic,Ord,Show,NFData)

357+instance alias1 ~ alias2 => IsLabel alias1 (Alias alias2) where

358+ fromLabel = Alias

359+instance aliases ~ '[alias] => IsLabel alias (NP Alias aliases) where

360+ fromLabel = fromLabel :* Nil

361+-- | >>> printSQL (#jimbob :: Alias "jimbob")

362+-- "jimbob"

363+instance KnownSymbol alias => RenderSQL (Alias alias) where

364+ renderSQL = doubleQuoted . fromString . symbolVal

365+

366+-- | >>> import Generics.SOP (NP(..))

367+-- >>> printSQL (#jimbob :* #kandi :: NP Alias '["jimbob", "kandi"])

368+-- "jimbob", "kandi"

369+instance All KnownSymbol aliases => RenderSQL (NP Alias aliases) where

370+ renderSQL

371+ = commaSeparated

372+ . hcollapse

373+ . hcmap (Proxy @KnownSymbol) (K . renderSQL)

374+

375+-- | The `As` operator is used to name an expression. `As` is like a demoted

376+-- version of `:::`.

377+--

378+-- >>> Just "hello" `As` #hi :: Aliased Maybe ("hi" ::: String)

379+-- As (Just "hello") Alias

380+data Aliased expression aliased where

381+ As

382+ :: KnownSymbol alias

383+ => expression ty

384+ -> Alias alias

385+ -> Aliased expression (alias ::: ty)

386+deriving instance Show (expression ty)

387+ => Show (Aliased expression (alias ::: ty))

388+deriving instance Eq (expression ty)

389+ => Eq (Aliased expression (alias ::: ty))

390+deriving instance Ord (expression ty)

391+ => Ord (Aliased expression (alias ::: ty))

392+instance (alias0 ~ alias1, alias0 ~ alias2, KnownSymbol alias2)

393+ => IsLabel alias0 (Aliased Alias (alias1 ::: alias2)) where

394+ fromLabel = fromLabel @alias2 `As` fromLabel @alias1

395+

396+-- | The `Aliasable` class provides a way to scrap your `Nil`s

397+-- in an `NP` list of `Aliased` expressions.

398+class KnownSymbol alias => Aliasable alias expression aliased

399+ | aliased -> expression

400+ , aliased -> alias

401+ where as :: expression -> Alias alias -> aliased

402+instance (KnownSymbol alias, aliased ~ (alias ::: ty)) => Aliasable alias

403+ (expression ty)

404+ (Aliased expression aliased)

405+ where

406+ as = As

407+instance (KnownSymbol alias, tys ~ '[alias ::: ty]) => Aliasable alias

408+ (expression ty)

409+ (NP (Aliased expression) tys)

410+ where

411+ expression `as` alias = expression `As` alias :* Nil

412+

413+-- | >>> let renderMaybe = fromString . maybe "Nothing" (const "Just")

414+-- >>> renderAliased renderMaybe (Just (3::Int) `As` #an_int)

415+-- "Just AS \"an_int\""

416+renderAliased

417+ :: (forall ty. expression ty -> ByteString)

418+ -> Aliased expression aliased

419+ -> ByteString

420+renderAliased render (expression `As` alias) =

421+ render expression <> " AS " <> renderSQL alias

422+

423+-- | @HasUnique alias fields field@ is a constraint that proves that

424+-- @fields@ is a singleton of @alias ::: field@.

425+type HasUnique alias fields field = fields ~ '[alias ::: field]

426+

427+-- | @Has alias fields field@ is a constraint that proves that

428+-- @fields@ has a field of @alias ::: field@, inferring @field@

429+-- from @alias@ and @fields@.

430+class KnownSymbol alias =>

431+ Has (alias :: Symbol) (fields :: [(Symbol,kind)]) (field :: kind)

432+ | alias fields -> field where

433+instance {-# OVERLAPPING #-} KnownSymbol alias

434+ => Has alias (alias ::: field ': fields) field

435+instance {-# OVERLAPPABLE #-} (KnownSymbol alias, Has alias fields field)

436+ => Has alias (field' ': fields) field

437+

438+{-| @HasIn fields (alias ::: field)@ is a constraint that proves that

439+@fields@ has a field of @alias ::: field@. It is used in @UPDATE@s to

440+choose which subfields to update.

441+-}

442+class HasIn fields field where

443+instance (Has alias fields field) => HasIn fields (alias ::: field) where

444+

445+-- | Utility class for `AllUnique` to provide nicer error messages.

446+class IsNotElem x isElem where

447+instance IsNotElem x 'False where

448+instance (TypeError ( 'Text "Cannot assign to "

449+ ':<>: 'ShowType alias

450+ ':<>: 'Text " more than once"))

451+ => IsNotElem '(alias, a) 'True where

452+

453+-- | No elem of @xs@ appears more than once, in the context of assignment.

454+class AllUnique (xs :: [(Symbol, a)]) where

455+instance AllUnique '[] where

456+instance (IsNotElem x (Elem x xs), AllUnique xs) => AllUnique (x ': xs) where

457+

458+{- |

459+The `DefaultAliasable` class is intended to help with Scrap your Nils

460+for default inserts and updates.

461+-}

462+class KnownSymbol alias

463+ => DefaultAliasable alias aliased | aliased -> alias where

464+ defaultAs :: Alias alias -> aliased

465+

466+-- | `HasAll` extends `Has` to take lists of @aliases@ and @fields@ and infer

467+-- a list of @subfields@.

468+class

469+ ( All KnownSymbol aliases

470+ ) => HasAll

471+ (aliases :: [Symbol])

472+ (fields :: [(Symbol,kind)])

473+ (subfields :: [(Symbol,kind)])

474+ | aliases fields -> subfields where

475+instance {-# OVERLAPPING #-} HasAll '[] fields '[]

476+instance {-# OVERLAPPABLE #-}

477+ (Has alias fields field, HasAll aliases fields subfields)

478+ => HasAll (alias ': aliases) fields (alias ::: field ': subfields)

479+

480+-- | Analagous to `IsLabel`, the constraint

481+-- `IsQualified` defines `!` for a column alias qualified

482+-- by a table alias.

483+class IsQualified table column expression where

484+ (!) :: Alias table -> Alias column -> expression

485+ infixl 9 !

486+instance IsQualified table column (Alias table, Alias column) where (!) = (,)

487+

488+{-| `QualifiedAlias`es enables multi-schema support by allowing a reference

489+to a `Table`, `Typedef` or `View` to be qualified by their schemas. By default,

490+a qualifier of @public@ is provided.

491+

492+>>> :{

493+let

494+ alias1 :: QualifiedAlias "sch" "tab"

495+ alias1 = #sch ! #tab

496+ alias2 :: QualifiedAlias "public" "vw"

497+ alias2 = #vw

498+in printSQL alias1 >> printSQL alias2

499+:}

500+"sch"."tab"

501+"vw"

502+-}

503+data QualifiedAlias (qualifier :: Symbol) (alias :: Symbol) = QualifiedAlias

504+ deriving (Eq,GHC.Generic,Ord,Show,NFData)

505+instance (q ~ q', a ~ a') => IsQualified q a (QualifiedAlias q' a') where

506+ _!_ = QualifiedAlias

507+instance (q' ~ "public", a ~ a') => IsLabel a (QualifiedAlias q' a') where

508+ fromLabel = QualifiedAlias

509+instance (q0 ~ q1, a0 ~ a1, a1 ~ a2, KnownSymbol a2) =>

510+ IsQualified q0 a0 (Aliased (QualifiedAlias q1) (a1 ::: a2)) where

511+ _!_ = QualifiedAlias `As` Alias

512+instance (q ~ "public", a0 ~ a1, a1 ~ a2, KnownSymbol a2) =>

513+ IsLabel a0 (Aliased (QualifiedAlias q) (a1 ::: a2)) where

514+ fromLabel = QualifiedAlias `As` Alias

515+

516+instance (KnownSymbol q, KnownSymbol a)

517+ => RenderSQL (QualifiedAlias q a) where

518+ renderSQL _ =

519+ let

520+ qualifier = renderSQL (Alias @q)

521+ alias = renderSQL (Alias @a)

522+ in

523+ if qualifier == "\"public\"" then alias else qualifier <> "." <> alias

524+

525+-- | @Elem@ is a promoted `Data.List.elem`.

526+type family Elem x xs where

527+ Elem x '[] = 'False

528+ Elem x (x ': xs) = 'True

529+ Elem x (_ ': xs) = Elem x xs

530+

531+-- | @In x xs@ is a constraint that proves that @x@ is in @xs@.

532+type family In x xs :: Constraint where In x xs = Elem x xs ~ 'True

533+

285534-- | Numeric Postgres types.

286535type PGNum =

287536 '[ 'PGint2, 'PGint4, 'PGint8, 'PGnumeric, 'PGfloat4, 'PGfloat8]

@@ -292,6 +541,37 @@ type PGFloating = '[ 'PGfloat4, 'PGfloat8, 'PGnumeric]

292541-- | Integral Postgres types.

293542type PGIntegral = '[ 'PGint2, 'PGint4, 'PGint8]

294543

544+-- | Error message helper for displaying unavailable\/unknown\/placeholder type

545+-- variables whose kind is known.

546+type Placeholder k = 'Text "(_::" :<>: 'ShowType k :<>: 'Text ")"

547+

548+type ErrArrayOf arr ty = arr :<>: 'Text " " :<>: ty

549+type ErrPGfixarrayOf t = ErrArrayOf ('ShowType 'PGfixarray :<>: 'Text " " :<>: Placeholder Nat) t

550+type ErrPGvararrayOf t = ErrArrayOf ('ShowType 'PGvararray) t

551+

552+-- | Ensure a type is a valid array type.

553+type family PGArray name arr :: Constraint where

554+ PGArray name ('PGvararray x) = ()

555+ PGArray name ('PGfixarray n x) = ()

556+ PGArray name val = TypeError

557+ ('Text name :<>: 'Text ": Unsatisfied PGArray constraint. Expected either: "

558+ :$$: 'Text " • " :<>: ErrPGvararrayOf (Placeholder PGType)

559+ :$$: 'Text " • " :<>: ErrPGfixarrayOf (Placeholder PGType)

560+ :$$: 'Text "But got: " :<>: 'ShowType val)

561+

562+-- | Ensure a type is a valid array type with a specific element type.

563+type family PGArrayOf name arr ty :: Constraint where

564+ PGArrayOf name ('PGvararray x) ty = x ~ ty

565+ PGArrayOf name ('PGfixarray n x) ty = x ~ ty

566+ PGArrayOf name val ty = TypeError

567+ ( 'Text name :<>: 'Text "Unsatisfied PGArrayOf constraint. Expected either: "

568+ :$$: 'Text " • " :<>: ErrPGvararrayOf ( 'ShowType ty )

569+ :$$: 'Text " • " :<>: ErrPGfixarrayOf ( 'ShowType ty )

570+ :$$: 'Text "But got: " :<>: 'ShowType val)

571+

572+-- | Ensure a type is a valid array type whose elements are text.

573+type PGTextArray name arr = PGArrayOf name arr ('NotNull 'PGtext)

574+

295575-- | `PGTypeOf` forgets about @NULL@ and any column constraints.

296576type family PGTypeOf (ty :: NullityType) :: PGType where

297577 PGTypeOf (nullity pg) = pg

@@ -305,24 +585,14 @@ instance ty0 ~ ty1 => SamePGType

305585

306586-- | `AllNotNull` is a constraint that proves a `ColumnsType` has no @NULL@s.

307587type family AllNotNull (columns :: ColumnsType) :: Constraint where

308− AllNotNull (_ ::: _ :=> 'NotNull _ ': _ ::: _ :=> 'NotNull _ ': _ ::: _ :=> 'NotNull _ ': _ ::: _ :=> 'NotNull _ ': _ ::: _ :=> 'NotNull _ ': _ ::: _ :=> 'NotNull _ ': columns) = AllNotNull columns

309− AllNotNull (_ ::: _ :=> 'NotNull _ ': _ ::: _ :=> 'NotNull _ ': _ ::: _ :=> 'NotNull _ ': _ ::: _ :=> 'NotNull _ ': _ ::: _ :=> 'NotNull _ ': columns) = AllNotNull columns

310− AllNotNull (_ ::: _ :=> 'NotNull _ ': _ ::: _ :=> 'NotNull _ ': _ ::: _ :=> 'NotNull _ ': _ ::: _ :=> 'NotNull _ ': columns) = AllNotNull columns

311− AllNotNull (_ ::: _ :=> 'NotNull _ ': _ ::: _ :=> 'NotNull _ ': _ ::: _ :=> 'NotNull _ ': columns) = AllNotNull columns

312− AllNotNull (_ ::: _ :=> 'NotNull _ ': _ ::: _ :=> 'NotNull _ ': columns) = AllNotNull columns

313− AllNotNull (_ ::: _ :=> 'NotNull _ ': columns) = AllNotNull columns

314588 AllNotNull '[] = ()

589+ AllNotNull (column ::: def :=> 'NotNull ty ': columns) = AllNotNull columns

315590

316591-- | `NotAllNull` is a constraint that proves a `ColumnsType` has some

317592-- @NOT NULL@.

318593type family NotAllNull (columns :: ColumnsType) :: Constraint where

319− NotAllNull (_ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> 'NotNull _ ': _) = ()

320− NotAllNull (_ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> 'NotNull _ ': _) = ()

321− NotAllNull (_ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> 'NotNull _ ': _) = ()

322− NotAllNull (_ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> 'NotNull _ ': _) = ()

323− NotAllNull (_ ::: _ :=> _ _ ': _ ::: _ :=> 'NotNull _ ': _) = ()

324− NotAllNull (_ ::: _ :=> 'NotNull _ ': _) = ()

325− NotAllNull (_ ::: _ :=> 'Null _ ': columns) = NotAllNull columns

594+ NotAllNull (column ::: def :=> 'NotNull ty ': columns) = ()

595+ NotAllNull (column ::: def :=> 'Null ty ': columns) = NotAllNull columns

326596

327597-- | `NullifyType` is an idempotent that nullifies a `NullityType`.

328598type family NullifyType (ty :: NullityType) :: NullityType where

@@ -331,37 +601,33 @@ type family NullifyType (ty :: NullityType) :: NullityType where

331601

332602-- | `NullifyRow` is an idempotent that nullifies a `RowType`.

333603type family NullifyRow (columns :: RowType) :: RowType where

334− NullifyRow (column ::: ty ': column1 ::: ty1 ': column2 ::: ty2 ': column3 ::: ty3 ': column4 ::: ty4 ': column5 ::: ty5 ': columns) =

335− column ::: NullifyType ty ': column1 ::: NullifyType ty1 ': column2 ::: NullifyType ty2 ': column3 ::: NullifyType ty3 ': column4 ::: NullifyType ty4 ': column5 ::: NullifyType ty5 ': NullifyRow columns

336− NullifyRow (column ::: ty ': column1 ::: ty1 ': column2 ::: ty2 ': column3 ::: ty3 ': column4 ::: ty4 ': columns) =

337− column ::: NullifyType ty ': column1 ::: NullifyType ty1 ': column2 ::: NullifyType ty2 ': column3 ::: NullifyType ty3 ': column4 ::: NullifyType ty4 ': NullifyRow columns

338− NullifyRow (column ::: ty ': column1 ::: ty1 ': column2 ::: ty2 ': column3 ::: ty3 ': columns) =

339− column ::: NullifyType ty ': column1 ::: NullifyType ty1 ': column2 ::: NullifyType ty2 ': column3 ::: NullifyType ty3 ': NullifyRow columns

340− NullifyRow (column ::: ty ': column1 ::: ty1 ': column2 ::: ty2 ': columns) =

341− column ::: NullifyType ty ': column1 ::: NullifyType ty1 ': column2 ::: NullifyType ty2 ': NullifyRow columns

342− NullifyRow (column ::: ty ': column1 ::: ty1 ': columns) =

343− column ::: NullifyType ty ': column1 ::: NullifyType ty1 ': NullifyRow columns

604+ NullifyRow '[] = '[]

344605 NullifyRow (column ::: ty ': columns) =

345606 column ::: NullifyType ty ': NullifyRow columns

346− NullifyRow '[] = '[]

347607

348608-- | `NullifyFrom` is an idempotent that nullifies a `FromType`

349609-- used to nullify the left or right hand side of an outer join

350610-- in a `Squeal.PostgreSQL.Query.FromClause`.

351611type family NullifyFrom (tables :: FromType) :: FromType where

352− NullifyFrom (table ::: columns ': table1 ::: columns1 ': table2 ::: columns2 ': table3 ::: columns3 ': table4 ::: columns4 ': table5 ::: columns5 ': tables) =

353− table ::: NullifyRow columns ': table1 ::: NullifyRow columns1 ': table2 ::: NullifyRow columns2 ': table3 ::: NullifyRow columns3 ': table4 ::: NullifyRow columns5 ': table5 ::: NullifyRow columns4 ': NullifyFrom tables

354− NullifyFrom (table ::: columns ': table1 ::: columns1 ': table2 ::: columns2 ': table3 ::: columns3 ': table4 ::: columns4 ': tables) =

355− table ::: NullifyRow columns ': table1 ::: NullifyRow columns1 ': table2 ::: NullifyRow columns2 ': table3 ::: NullifyRow columns3 ': table4 ::: NullifyRow columns4 ': NullifyFrom tables

356− NullifyFrom (table ::: columns ': table1 ::: columns1 ': table2 ::: columns2 ': table3 ::: columns3 ': tables) =

357− table ::: NullifyRow columns ': table1 ::: NullifyRow columns1 ': table2 ::: NullifyRow columns2 ': table3 ::: NullifyRow columns3 ': NullifyFrom tables

358− NullifyFrom (table ::: columns ': table1 ::: columns1 ': table2 ::: columns2 ': tables) =

359− table ::: NullifyRow columns ': table1 ::: NullifyRow columns1 ': table2 ::: NullifyRow columns2 ': NullifyFrom tables

360− NullifyFrom (table ::: columns ': table1 ::: columns1 ': tables) =

361− table ::: NullifyRow columns ': table1 ::: NullifyRow columns1 ': NullifyFrom tables

612+ NullifyFrom '[] = '[]

362613 NullifyFrom (table ::: columns ': tables) =

363614 table ::: NullifyRow columns ': NullifyFrom tables

364− NullifyFrom '[] = '[]

615+

616+-- | `Join` is simply promoted `++` and is used in @JOIN@s in

617+-- `Squeal.PostgreSQL.Query.FromClause`s.

618+type family Join xs ys where

619+ Join '[] ys = ys

620+ Join (x ': xs) ys = x ': Join xs ys

621+

622+-- | `disjoin` is a utility function for splitting an `NP` list into pieces.

623+disjoin

624+ :: forall xs ys expr. SListI xs

625+ => NP expr (Join xs ys)

626+ -> (NP expr xs, NP expr ys)

627+disjoin = case sList @xs of

628+ SNil -> \ys -> (Nil, ys)

629+ SCons -> \(x :* xsys) ->

630+ case disjoin xsys of (xs,ys) -> (x :* xs, ys)

365631

366632-- | @Create alias x xs@ adds @alias ::: x@ to the end of @xs@ and is used in

367633-- `Squeal.PostgreSQL.Definition.createTable` statements and in @ALTER TABLE@

@@ -371,101 +637,30 @@ type family Create alias x xs where

371637 Create alias x (alias ::: y ': xs) = TypeError

372638 ('Text "Create: alias "

373639 ':<>: 'ShowType alias

374− ':<>: 'Text "already exists")

640+ ':<>: 'Text "already in use")

375641 Create alias y (x ': xs) = x ': Create alias y xs

376642

377−type family CreateIfNotExists alias x xs where

378− CreateIfNotExists alias x '[] = '[alias ::: x]

379− CreateIfNotExists alias x (alias ::: y ': xs) = alias ::: y ': xs

380− CreateIfNotExists alias y (x ': xs) = x ': CreateIfNotExists alias y xs

381−

382−type family CreateOrReplace alias x xs where

383− CreateOrReplace alias x '[] = '[alias ::: x]

384− CreateOrReplace alias x (alias ::: x ': xs) = alias ::: x ': xs

385− CreateOrReplace alias x (alias ::: y ': xs) = TypeError

386− ('Text "CreateOrReplace: expected type "

387− ':<>: 'ShowType x

388− ':<>: 'Text " but alias "

389− ':<>: 'ShowType alias

390− ':<>: 'Text " has type "

391− ':<>: 'ShowType y)

392− CreateOrReplace alias y (x ': xs) = x ': CreateOrReplace alias y xs

393−

394643-- | @Drop alias xs@ removes the type associated with @alias@ in @xs@

395644-- and is used in `Squeal.PostgreSQL.Definition.dropTable` statements

396645-- and in @ALTER TABLE@ `Squeal.PostgreSQL.Definition.dropColumn` statements.

397646type family Drop alias xs where

398− Drop alias '[] = TypeError

399− ('Text "Drop: alias "

400− ':<>: 'ShowType alias

401− ':<>: 'Text " does not exist" )

402− Drop alias (alias ::: x ': xs) = xs

647+ Drop alias ((alias ::: x) ': xs) = xs

403648 Drop alias (x ': xs) = x ': Drop alias xs

404649

405−type family DropSchemum alias sch xs where

406− DropSchemum alias sch '[] = TypeError

407− ('Text "DropSchemum: alias "

408− ':<>: 'ShowType alias

409− ':<>: 'Text " does not exist" )

410− DropSchemum alias sch (alias ::: sch x ': xs) = xs

411− DropSchemum alias sch0 (alias ::: sch1 x ': xs) = TypeError

412− ('Text "DropSchemum: expected schemum "

413− ':<>: 'ShowType sch0

414− ':<>: 'Text " but alias "

415− ':<>: 'ShowType alias

416− ':<>: 'Text " has schemum "

417− ':<>: 'ShowType sch1)

418− DropSchemum alias sch (x ': xs) = x ': DropSchemum alias sch xs

419−

420−type family DropIfExists alias xs where

421− DropIfExists alias '[] = '[]

422− DropIfExists alias (alias ::: x ': xs) = xs

423− DropIfExists alias (x ': xs) = x ': DropIfExists alias xs

424−

425−type family DropSchemumIfExists alias sch xs where

426− DropSchemumIfExists alias sch '[] = '[]

427− DropSchemumIfExists alias sch (alias ::: sch x ': xs) = xs

428− DropSchemumIfExists alias sch0 (alias ::: sch1 x ': xs) = TypeError

429− ('Text "DropSchemumIfExists: expected schemum "

430− ':<>: 'ShowType sch1

431− ':<>: 'Text " but alias "

432− ':<>: 'ShowType alias

433− ':<>: 'Text " has schemum "

434− ':<>: 'ShowType sch0)

435− DropSchemumIfExists alias sch (x ': xs) = x ': DropSchemumIfExists alias sch xs

436−

437650-- | @Alter alias x xs@ replaces the type associated with an @alias@ in @xs@

438651-- with the type @x@ and is used in `Squeal.PostgreSQL.Definition.alterTable`

439652-- and `Squeal.PostgreSQL.Definition.alterColumn`.

440653type family Alter alias x xs where

441− Alter alias x '[] = TypeError

442− ('Text "Alter: alias "

443− ':<>: 'ShowType alias

444− ':<>: 'Text " does not exist" )

445654 Alter alias x1 (alias ::: x0 ': xs) = alias ::: x1 ': xs

446655 Alter alias x1 (x0 ': xs) = x0 ': Alter alias x1 xs

447656

448−type family AlterIfExists alias x xs where

449− AlterIfExists alias x '[] = '[]

450− AlterIfExists alias x1 (alias ::: x0 ': xs) = alias ::: x1 ': xs

451− AlterIfExists alias x1 (x0 ': xs) = x0 ': AlterIfExists alias x1 xs

452−

453657-- | @Rename alias0 alias1 xs@ replaces the alias @alias0@ by @alias1@ in @xs@

454658-- and is used in `Squeal.PostgreSQL.Definition.alterTableRename` and

455659-- `Squeal.PostgreSQL.Definition.renameColumn`.

456660type family Rename alias0 alias1 xs where

457− Rename alias0 alias1 '[] = TypeError

458− ('Text "Rename: alias "

459− ':<>: 'ShowType alias0

460− ':<>: 'Text " does not exist" )

461661 Rename alias0 alias1 ((alias0 ::: x0) ': xs) = (alias1 ::: x0) ': xs

462662 Rename alias0 alias1 (x ': xs) = x ': Rename alias0 alias1 xs

463663

464−type family RenameIfExists alias0 alias1 xs where

465− RenameIfExists alias x '[] = '[]

466− RenameIfExists alias0 alias1 ((alias0 ::: x0) ': xs) = (alias1 ::: x0) ': xs

467− RenameIfExists alias0 alias1 (x ': xs) = x ': RenameIfExists alias0 alias1 xs

468−

469664-- | Check if a `TableConstraint` involves a column

470665type family ConstraintInvolves column constraint where

471666 ConstraintInvolves column ('Check columns) = column `Elem` columns

@@ -482,35 +677,22 @@ type family DropIfConstraintsInvolve column constraints where

482677 (DropIfConstraintsInvolve column constraints)

483678 (alias ::: constraint ': DropIfConstraintsInvolve column constraints)

484679

680+{- | Calculate the `Length` of a type level list

681+

682+>>> :kind! Length '[Char,String,Bool,Double]

683+Length '[Char,String,Bool,Double] :: Nat

684+= 4

685+-}

686+type family Length (xs :: [k]) :: Nat where

687+ Length (x : xs) = 1 + Length xs

688+ Length '[] = 0

689+

485690-- | A `SchemumType` is a user-defined type, either a `Table`,

486691-- `View` or `Typedef`.

487692data SchemumType

488693 = Table TableType

489694 | View RowType

490695 | Typedef PGType

491− | Index IndexType

492− | Function FunctionType

493− | Operator OperatorType

494− | UnsafeSchemum Symbol

495−

496−type FunctionType = ([NullityType], ReturnsType)

497−

498−data IndexType

499− = Btree

500− | Hash

501− | Gist

502− | Spgist

503− | Gin

504− | Brin

505−

506−data ReturnsType

507− = Returns NullityType

508− | ReturnsTable RowType

509−

510−data OperatorType

511− = BinaryOp NullityType NullityType NullityType

512− | LeftOp NullityType NullityType

513− | RightOp NullityType NullityType

514696

515697{- | The schema of a database consists of a list of aliased,

516698user-defined `SchemumType`s.

@@ -553,7 +735,9 @@ There are several reasons why one might want to use schemas:

553735-}

554736type SchemasType = [(Symbol,SchemaType)]

555737

556−-- | A type family to use for a single schema database.

738+{-|

739+

740+-}

557741type family Public (schema :: SchemaType) :: SchemasType

558742 where Public schema = '["public" ::: schema]

559743

@@ -582,15 +766,23 @@ type PGJsonKey = '[ 'PGint2, 'PGint4, 'PGtext ]

582766-- | Is a type a valid JSON type?

583767type PGJsonType = '[ 'PGjson, 'PGjsonb ]

584768

585−-- | Utility class for `AllUnique` to provide nicer error messages.

586−class IsNotElem x isElem where

587−instance IsNotElem x 'False where

588−instance (TypeError ( 'Text "Cannot assign to "

589− ':<>: 'ShowType alias

590− ':<>: 'Text " more than once"))

591− => IsNotElem '(alias, a) 'True where

592−

593−-- | No elem of @xs@ appears more than once, in the context of assignment.

594−class AllUnique (xs :: [(Symbol, a)]) where

595−instance AllUnique '[] where

596−instance (IsNotElem x (Elem x xs), AllUnique xs) => AllUnique (x ': xs) where

769+-- | An `AlignedList` is a type-aligned list or free category.

770+data AlignedList p x0 x1 where

771+ Done :: AlignedList p x x

772+ (:>>) :: p x0 x1 -> AlignedList p x1 x2 -> AlignedList p x0 x2

773+infixr 7 :>>

774+instance Category (AlignedList p) where

775+ id = Done

776+ (.) list = \case

777+ Done -> list

778+ step :>> steps -> step :>> (steps >>> list)

779+instance (forall t0 t1. RenderSQL (p t0 t1))

780+ => RenderSQL (AlignedList p x0 x1) where

781+ renderSQL = \case

782+ Done -> ""

783+ step :>> Done -> renderSQL step

784+ step :>> steps -> renderSQL step <> ", " <> renderSQL steps

785+

786+-- | A `single` step.

787+single :: p x0 x1 -> AlignedList p x0 x1

788+single step = step :>> Done

squeal-postgresql/src/Squeal/PostgreSQL/Transaction.hs+48−78

@@ -1,7 +1,7 @@

11{-|

22Module: Squeal.PostgreSQL.Transaction

33Description: Squeal transaction control language

4−Copyright: (c) Eitan Chatav, 2019

4+Copyright: (c) Eitan Chatav, 2017

55Maintainer: eitan@morphism.tech

66Stability: experimental

@@ -20,12 +20,11 @@ module Squeal.PostgreSQL.Transaction

2020 ( -- * Transaction

2121 transactionally

2222 , transactionally_

23− , transactionallyRetry

24− , ephemerally

25− , ephemerally_

2623 , begin

2724 , commit

2825 , rollback

26+ , transactionallySchema

27+ , transactionallySchema_

2928 -- * Transaction Mode

3029 , TransactionMode (..)

3130 , defaultMode

@@ -35,99 +34,70 @@ module Squeal.PostgreSQL.Transaction

3534 , DeferrableMode (..)

3635 ) where

3736

38−import UnliftIO

37+import Control.Exception.Lifted

38+import Control.Monad.Base

39+import Control.Monad.Trans.Control

40+import Generics.SOP

41+

42+import qualified Database.PostgreSQL.LibPQ as LibPQ

3943

4044import Squeal.PostgreSQL.Manipulation

4145import Squeal.PostgreSQL.Render

4246import Squeal.PostgreSQL.PQ

47+import Squeal.PostgreSQL.Schema

4348

44−{- | Run a computation `transactionally`;

45−first `begin`,

46−then run the computation,

47−`onException` `rollback` and rethrow the exception,

48−otherwise `commit` and `return` the result.

49−-}

49+-- | Run a schema invariant computation `transactionally`.

5050transactionally

51− :: (MonadUnliftIO tx, MonadPQ schemas tx)

51+ :: (MonadBaseControl IO tx, MonadPQ schemas tx)

5252 => TransactionMode

5353 -> tx x -- ^ run inside a transaction

5454 -> tx x

5555transactionally mode tx = mask $ \restore -> do

56− manipulate_ $ begin mode

57− result <- restore tx `onException` (manipulate_ rollback)

58− manipulate_ commit

56+ _ <- begin mode

57+ result <- restore tx `onException` rollback

58+ _ <- commit

5959 return result

6060

61−-- | Run a computation `transactionally_`, in `defaultMode`.

61+-- | Run a schema invariant computation `transactionally_` in `defaultMode`.

6262transactionally_

63− :: (MonadUnliftIO tx, MonadPQ schemas tx)

63+ :: (MonadBaseControl IO tx, MonadPQ schemas tx)

6464 => tx x -- ^ run inside a transaction

6565 -> tx x

6666transactionally_ = transactionally defaultMode

6767

68−{- |

69−`transactionallyRetry` a computation;

70−

71−* first `begin`,

72−* then `try` the computation,

73− - if it raises a serialization failure then `rollback` and restart the transaction,

74− - if it raises any other exception then `rollback` and rethrow the exception,

75− - otherwise `commit` and `return` the result.

76−-}

77−transactionallyRetry

78− :: (MonadUnliftIO tx, MonadPQ schemas tx)

79− => TransactionMode

80− -> tx x -- ^ run inside a transaction

81− -> tx x

82−transactionallyRetry mode tx = mask $ \restore ->

83− loop . try $ do

84− x <- restore tx

85− manipulate_ commit

86− return x

87− where

88− loop attempt = do

89− manipulate_ $ begin mode

90− attempt >>= \case

91− Left (PQException (PQState _ (Just "40001") _)) -> do

92− manipulate_ rollback

93− loop attempt

94− Left err -> do

95− manipulate_ rollback

96− throwIO err

97− Right x -> return x

98−

99−{- | Run a computation `ephemerally`;

100−Like `transactionally` but always `rollback`, useful in testing.

101−-}

102−ephemerally

103− :: (MonadUnliftIO tx, MonadPQ schemas tx)

104− => TransactionMode

105− -> tx x -- ^ run inside an ephemeral transaction

106− -> tx x

107−ephemerally mode tx = mask $ \restore -> do

108− manipulate_ $ begin mode

109− result <- restore tx `onException` (manipulate_ rollback)

110− manipulate_ rollback

111− return result

112−

113−{- | Run a computation `ephemerally` in `defaultMode`. -}

114−ephemerally_

115− :: (MonadUnliftIO tx, MonadPQ schemas tx)

116− => tx x -- ^ run inside an ephemeral transaction

117− -> tx x

118−ephemerally_ = ephemerally defaultMode

119−

12068-- | @BEGIN@ a transaction.

121−begin :: TransactionMode -> Manipulation_ schemas () ()

122−begin mode = UnsafeManipulation $ "BEGIN" <+> renderSQL mode

69+begin :: MonadPQ schemas tx => TransactionMode -> tx (K Result ('[] :: RowType))

70+begin mode = manipulate . UnsafeManipulation $

71+ "BEGIN" <+> renderSQL mode <> ";"

12372

124−-- | @COMMIT@ a transaction.

125−commit :: Manipulation_ schemas () ()

126−commit = UnsafeManipulation "COMMIT"

73+-- | @COMMIT@ a schema invariant transaction.

74+commit :: MonadPQ schemas tx => tx (K Result ('[] :: RowType))

75+commit = manipulate $ UnsafeManipulation "COMMIT;"

12776

128−-- | @ROLLBACK@ a transaction.

129−rollback :: Manipulation_ schemas () ()

130−rollback = UnsafeManipulation "ROLLBACK"

77+-- | @ROLLBACK@ a schema invariant transaction.

78+rollback :: MonadPQ schemas tx => tx (K Result ('[] :: RowType))

79+rollback = manipulate $ UnsafeManipulation "ROLLBACK;"

80+

81+-- | Run a schema changing computation `transactionallySchema`.

82+transactionallySchema

83+ :: MonadBaseControl IO io

84+ => TransactionMode

85+ -> PQ schemas0 schemas1 io x

86+ -> PQ schemas0 schemas1 io x

87+transactionallySchema mode u = PQ $ \ conn -> mask $ \ restore -> do

88+ _ <- liftBase . LibPQ.exec (unK conn) $

89+ "BEGIN" <+> renderSQL mode <> ";"

90+ x <- restore (unPQ u conn)

91+ `onException` (liftBase (LibPQ.exec (unK conn) "ROLLBACK"))

92+ _ <- liftBase $ LibPQ.exec (unK conn) "COMMIT"

93+ return x

94+

95+-- | Run a schema changing computation `transactionallySchema_` in `defaultMode`.

96+transactionallySchema_

97+ :: MonadBaseControl IO io

98+ => PQ schemas0 schemas1 io x

99+ -> PQ schemas0 schemas1 io x

100+transactionallySchema_ = transactionallySchema defaultMode

131101

132102-- | The available transaction characteristics are the transaction `IsolationLevel`,

133103-- the transaction `AccessMode` (`ReadWrite` or `ReadOnly`), and the `DeferrableMode`.

@@ -140,7 +110,7 @@ data TransactionMode = TransactionMode

140110-- | `TransactionMode` with a `Serializable` `IsolationLevel`,

141111-- `ReadWrite` `AccessMode` and `NotDeferrable` `DeferrableMode`.

142112defaultMode :: TransactionMode

143−defaultMode = TransactionMode ReadCommitted ReadWrite NotDeferrable

113+defaultMode = TransactionMode Serializable ReadWrite NotDeferrable

144114

145115-- | `TransactionMode` with a `Serializable` `IsolationLevel`,

146116-- `ReadOnly` `AccessMode` and `Deferrable` `DeferrableMode`.

squeal-postgresql/test/Doc.hsdeleted−6

@@ -1,6 +0,0 @@

1−module Main (main) where

2−

3−import Test.DocTest

4−

5−main :: IO ()

6−main = doctest [ "-isrc", "src" ]

squeal-postgresql/test/DocTest.hsnew file+18

@@ -0,0 +1,18 @@

1+module Main (main) where

3+import Test.DocTest

5+main :: IO ()

6+main = doctest

7+ [ "-isrc"

8+ , "src/Squeal/PostgreSQL.hs"

9+ , "src/Squeal/PostgreSQL/Binary.hs"

10+ , "src/Squeal/PostgreSQL/Definition.hs"

11+ , "src/Squeal/PostgreSQL/Manipulation.hs"

12+ , "src/Squeal/PostgreSQL/Query.hs"

13+ , "src/Squeal/PostgreSQL/Expression.hs"

14+ , "src/Squeal/PostgreSQL/PQ.hs"

15+ , "src/Squeal/PostgreSQL/Migration.hs"

16+ , "src/Squeal/PostgreSQL/Transaction.hs"

17+ , "src/Squeal/PostgreSQL/Pool.hs"

18+ ]

squeal-postgresql/test/Property.hsdeleted−166

@@ -1,166 +0,0 @@

1−{-# LANGUAGE

2− DataKinds

3− , GADTs

4− , LambdaCase

5− , OverloadedLabels

6− , OverloadedStrings

7− , TypeApplications

8− , TypeOperators

9−#-}

10−

11−module Main (main) where

12−

13−import Control.Monad.Trans

14−import Data.ByteString (ByteString)

15−import Data.ByteString.Char8 (unpack)

16−import Data.Scientific (fromFloatDigits)

17−import Data.Fixed (Fixed(MkFixed), Micro, Pico)

18−import Data.String (IsString(fromString))

19−import Data.Time

20−import Squeal.PostgreSQL hiding (check, defaultMain, Group)

21−import Hedgehog hiding (Range)

22−import qualified Hedgehog.Gen as Gen

23−import qualified Hedgehog.Main as Main

24−import qualified Hedgehog.Range as Range

25−

26−main :: IO ()

27−main = Main.defaultMain [checkSequential roundtrips]

28−

29−roundtrips :: Group

30−roundtrips = Group "roundtrips"

31− [ roundtrip int2 genInt16

32− , roundtrip int4 genInt32

33− , roundtrip int8 genInt64

34− , roundtrip bool Gen.bool

35− , roundtrip numeric genScientific

36− , roundtrip float4 genFloat

37− , roundtrip float8 genDouble

38− , roundtripOn normalizeTimeOfDay time genTimeOfDay

39− -- , roundtrip timetz genTimeWithZone normalizeTimeWithZone

40− , roundtripOn normalizeLocalTime timestamp genLocalTime

41− , roundtrip timestamptz genUTCTime

42− , roundtrip date genDay

43− , roundtrip interval genDiffTime

44− , roundtripOn normalizeIntRange int4range (genRange genInt32)

45− , roundtripOn normalizeIntRange int8range (genRange genInt64)

46− , roundtrip numrange (genRange genScientific)

47− , roundtripOn (fmap normalizeLocalTime) tsrange (genRange genLocalTime)

48− , roundtrip tstzrange (genRange genUTCTime)

49− , roundtripOn normalizeIntRange daterange (genRange genDay)

50− ]

51− where

52− genInt16 = Gen.int16 Range.exponentialBounded

53− genInt32 = Gen.int32 Range.exponentialBounded

54− genInt64 = Gen.int64 Range.exponentialBounded

55− genScientific = fromFloatDigits <$> genFloat

56− genPosFloat = Gen.float

57− (Range.exponentialFloatFrom 1 minPosFloat maxPosFloat)

58− genFloat = Gen.prune $ Gen.choice

59− [ genPosFloat

60− , negate <$> genPosFloat

61− , Gen.element [0,1/0] ]

62− genPosDouble = Gen.double

63− (Range.exponentialFloatFrom 1 minPosFloat maxPosFloat)

64− genDouble = Gen.prune $ Gen.choice

65− [ genPosDouble

66− , negate <$> genPosDouble

67− , Gen.element [0,1/0] ]

68− genRange gen = do

69− lb <- gen

70− ub <- Gen.filter (lb <) gen

71− Gen.element

72− [ Empty, singleton lb, whole

73− , lb <=..<= ub , lb <=..< ub, lb <..<= ub, lb <..< ub

74− , atLeast lb, moreThan lb, atMost ub, lessThan ub ]

75− genDay = do

76− y <- toInteger <$> Gen.int (Range.constant 2000 2019)

77− m <- Gen.int (Range.constant 1 12)

78− d <- Gen.int (Range.constant 1 28)

79− return $ fromGregorian y m d

80− genDiffTime = secondsToDiffTime . toInteger <$>

81− Gen.int (Range.constant 0 86401)

82− genUTCTime = UTCTime <$> genDay <*> genDiffTime

83− genTimeOfDay = do

84− h <- Gen.int (Range.constant 0 23)

85− m <- Gen.int (Range.constant 0 59)

86− s <- MkFixed . toInteger <$> Gen.int (Range.constant 0 59)

87− return $ TimeOfDay h m s

88− genLocalTime = LocalTime <$> genDay <*> genTimeOfDay

89− -- genTimeZone = Gen.element $ map (read @TimeZone)

90− -- [ "UTC", "UT", "GMT", "EST", "EDT", "CST"

91− -- , "CDT", "MST", "MDT", "PST", "PDT" ]

92− -- genTimeWithZone = (,) <$> genTimeOfDay <*> genTimeZone

93−

94−roundtrip

95− :: (OidOf ty, ToParam x ty, FromValue ty x, Show x, Eq x)

96− => TypeExpression schemas ('NotNull ty)

97− -> Gen x

98− -> (PropertyName, Property)

99−roundtrip = roundtripOn id

100−

101−roundtripOn

102− :: (OidOf ty, ToParam x ty, FromValue ty x, Show x, Eq x)

103− => (x -> x)

104− -> TypeExpression schemas ('NotNull ty)

105− -> Gen x

106− -> (PropertyName, Property)

107−roundtripOn norm ty gen = propertyWithName $ do

108− x <- forAll gen

109− Just (Only y) <- lift . withConnection connectionString $

110− firstRow =<< runQueryParams

111− (values_ (parameter @1 ty `as` #fromOnly)) (Only x)

112− norm x === y

113− where

114− propertyWithName prop =

115− (fromString (unpack (renderSQL ty)), property prop)

116−

117−maxPosFloat :: RealFloat a => a

118−maxPosFloat = x

119− where

120− n = floatDigits x

121− b = floatRadix x

122− (_, u) = floatRange x

123− x = encodeFloat (b^n - 1) (u - n)

124−

125−minPosFloat :: RealFloat a => a

126−minPosFloat = x

127− where

128− n = floatDigits x

129− b = floatRadix x

130− (l, _) = floatRange x

131− x = encodeFloat (b^n - 1) (l - n - 1)

132−

133−connectionString :: ByteString

134−connectionString = "host=localhost port=5432 dbname=exampledb"

135−

136−normalizeIntRange :: (Enum int, Ord int) => Range int -> Range int

137−normalizeIntRange = \case

138− Empty -> Empty

139− NonEmpty l u ->

140− let

141− l' = normalizeL l

142− u' = normalizeU u

143− in if emptyNormalized l' u' then Empty else NonEmpty l' u'

144− where

145− normalizeL = \case

146− Open l -> Closed (succ l)

147− normalized -> normalized

148− normalizeU = \case

149− Closed u -> Open (succ u)

150− normalized -> normalized

151− emptyNormalized (Closed l) (Open u) = l >= u

152− emptyNormalized _ _ = False

153−

154−normalizeTimeOfDay :: TimeOfDay -> TimeOfDay

155−normalizeTimeOfDay (TimeOfDay h m s) = TimeOfDay h m

156− . fromRational @Pico

157− . toRational @Micro

158− . fromRational @Micro

159− . toRational @Pico

160− $ s

161−

162−normalizeLocalTime :: LocalTime -> LocalTime

163−normalizeLocalTime (LocalTime d t) = LocalTime d (normalizeTimeOfDay t)

164−

165−-- normalizeTimeWithZone :: (TimeOfDay, TimeZone) -> (TimeOfDay, TimeZone)

166−-- normalizeTimeWithZone (t, z) = (normalizeTimeOfDay t, z)

squeal-postgresql/test/Spec.hsdeleted−136

@@ -1,136 +0,0 @@

1−{-# LANGUAGE

2− DataKinds

3− , DeriveAnyClass

4− , DeriveGeneric

5− , DerivingStrategies

6− , DuplicateRecordFields

7− , FlexibleContexts

8− , OverloadedLabels

9− , OverloadedLists

10− , OverloadedStrings

11− , TypeApplications

12− , TypeFamilies

13− , TypeInType

14− , TypeOperators

15−#-}

16−

17−module Main (main) where

18−

19−import Control.Concurrent.Async (replicateConcurrently)

20−import Data.ByteString (ByteString)

21−import Data.Int (Int32)

22−import Data.Text (Text)

23−import Test.Hspec

24−

25−import qualified Generics.SOP as SOP

26−import qualified GHC.Generics as GHC

27−

28−import Squeal.PostgreSQL

29−

30−main :: IO ()

31−main = hspec spec

32−

33−type Schemas = Public

34− '[ "users" ::: 'Table (

35− '[ "pk_users" ::: 'PrimaryKey '["id"]

36− , "unique_names" ::: 'Unique '["name"]

37− ] :=>

38− '[ "id" ::: 'Def :=> 'NotNull 'PGint4

39− , "name" ::: 'NoDef :=> 'NotNull 'PGtext ] ) ]

40−

41−data User = User

42− { userName :: Text

43− } deriving stock (Eq, Show, GHC.Generic)

44− deriving anyclass (SOP.Generic, SOP.HasDatatypeInfo)

45−

46−insertUser :: Manipulation_ Schemas User ()

47−insertUser = insertInto_ #users

48− (Values_ (Default `as` #id :* Set (param @1) `as` #name))

49−

50−setup :: Definition (Public '[]) Schemas

51−setup =

52− createTable #users

53− ( serial `as` #id :*

54− notNullable text `as` #name )

55− ( primaryKey #id `as` #pk_users :*

56− unique #name `as` #unique_names )

57−

58−teardown :: Definition Schemas (Public '[])

59−teardown = dropTable #users

60−

61−silence :: MonadPQ schemas pq => pq ()

62−silence = manipulate_ $

63− UnsafeManipulation "SET client_min_messages TO WARNING;"

64−

65−setupDB :: IO ()

66−setupDB = withConnection connectionString $

67− silence & pqThen (define setup)

68−

69−dropDB :: IO ()

70−dropDB = withConnection connectionString $

71− silence & pqThen (define teardown)

72−

73−connectionString :: ByteString

74−connectionString = "host=localhost port=5432 dbname=exampledb"

75−

76−spec :: Spec

77−spec = before_ setupDB . after_ dropDB $ do

78−

79− describe "Exceptions" $ do

80−

81− let

82− testUser = User "TestUser"

83− newUser = manipulateParams_ insertUser

84− insertUserTwice = newUser testUser >> newUser testUser

85− err23505 = PQException $ PQState FatalError (Just "23505")

86− (Just "ERROR: duplicate key value violates unique constraint \"unique_names\"\nDETAIL: Key (name)=(TestUser) already exists.\n")

87−

88− it "should be thrown for constraint violation" $

89− withConnection connectionString insertUserTwice

90− `shouldThrow` (== err23505)

91−

92− it "should be rethrown for constraint violation in a transaction" $

93− withConnection connectionString (transactionally_ insertUserTwice)

94− `shouldThrow` (== err23505)

95−

96− describe "Pools" $

97−

98− it "should manage concurrent transactions" $ do

99− pool <- createConnectionPool

100− "host=localhost port=5432 dbname=exampledb" 1 0.5 10

101− let

102− query :: Query_ (Public '[]) () (Only Char)

103− query = values_ (literal 'a' `as` #fromOnly)

104− session = usingConnectionPool pool . transactionally_ $ do

105− result <- runQuery query

106− Just (Only chr) <- firstRow result

107− return chr

108− chrs <- replicateConcurrently 10 session

109− chrs `shouldSatisfy` all (== 'a')

110−

111− describe "Ranges" $

112−

113− it "should correctly decode ranges" $ do

114−

115− rangesOut <- withConnection connectionString $ do

116− let

117− query :: Query_ (Public '[]) () (Only (Range Int32))

118− query = values

119− ( range int4range (atLeast 3) `as` #fromOnly )

120− [ range int4range (3 <=..< 5) `as` #fromOnly

121− , range int4range Empty `as` #fromOnly

122− , range int4range whole `as` #fromOnly ]

123− getRows =<< runQuery query

124− (fromOnly <$> rangesOut :: [Range Int32]) `shouldBe`

125− [ atLeast 3, 3 <=..< 5, Empty, whole ]

126−

127− describe "Parameters" $ do

128−

129− it "should run queries that don't reference all their parameters" $ do

130−

131− out <- withConnection connectionString $ do

132− let

133− query :: Query_ (Public '[]) (Char,Int32) (Only Int32)

134− query = values_ (param @2 `as` #fromOnly)

135− firstRow =<< runQueryParams query ('a', 3 :: Int32)

136− (fromOnly <$> out :: Maybe Int32) `shouldBe` Just 3

squeal-postgresql/test/Specs/ExceptionHandling.hsnew file+126

@@ -0,0 +1,126 @@

1+{-# LANGUAGE DataKinds #-}

2+{-# LANGUAGE DeriveGeneric #-}

3+{-# LANGUAGE DuplicateRecordFields #-}

4+{-# LANGUAGE FlexibleContexts #-}

5+{-# LANGUAGE OverloadedLabels #-}

6+{-# LANGUAGE OverloadedLists #-}

7+{-# LANGUAGE OverloadedStrings #-}

8+{-# LANGUAGE TypeApplications #-}

9+{-# LANGUAGE TypeFamilies #-}

10+{-# LANGUAGE TypeInType #-}

11+{-# LANGUAGE TypeOperators #-}

12+module ExceptionHandling

13+ ( specs

14+ , User (..)

15+ )

16+where

17+

18+import Control.Monad (void)

19+import Control.Monad.Base (MonadBase)

20+import qualified Data.ByteString.Char8 as Char8

21+import Data.Int (Int16)

22+import Data.Text (Text)

23+import Data.Vector (Vector)

24+import qualified Generics.SOP as SOP

25+import qualified GHC.Generics as GHC

26+import Squeal.PostgreSQL

27+import Squeal.PostgreSQL.Migration

28+import Test.Hspec

29+

30+type Schema =

31+ '[ "users" ::: 'Table (

32+ '[ "pk_users" ::: 'PrimaryKey '["id"]

33+ , "unique_names" ::: 'Unique '["name"]

34+ ] :=>

35+ '[ "id" ::: 'Def :=> 'NotNull 'PGint4

36+ , "name" ::: 'NoDef :=> 'NotNull 'PGtext

37+ , "vec" ::: 'NoDef :=> 'NotNull ('PGvararray ('Null 'PGint2))

38+ ])

39+ , "emails" ::: 'Table (

40+ '[ "pk_emails" ::: 'PrimaryKey '["id"]

41+ , "fk_user_id" ::: 'ForeignKey '["user_id"] "users" '["id"]

42+ ] :=>

43+ '[ "id" ::: 'Def :=> 'NotNull 'PGint4

44+ , "user_id" ::: 'NoDef :=> 'NotNull 'PGint4

45+ , "email" ::: 'NoDef :=> 'Null 'PGtext

46+ ])

47+ ]

48+

49+type Schemas = Public Schema

50+

51+data User =

52+ User { userName :: Text

53+ , userEmail :: Maybe Text

54+ , userVec :: VarArray (Vector (Maybe Int16)) }

55+ deriving (Show, GHC.Generic)

56+instance SOP.Generic User

57+instance SOP.HasDatatypeInfo User

58+

59+insertUser :: Manipulation '[] Schemas '[ 'NotNull 'PGtext, 'NotNull ('PGvararray ('Null 'PGint2))]

60+ '[ "fromOnly" ::: 'NotNull 'PGint4 ]

61+insertUser = insertInto #users

62+ (Values_ (defaultAs #id :* param @1 `as` #name :* param @2 `as` #vec))

63+ OnConflictDoRaise (Returning (#id `as` #fromOnly))

64+

65+setup :: Definition (Public '[]) Schemas

66+setup =

67+ createTable #users

68+ ( serial `as` #id :*

69+ (text & notNullable) `as` #name :*

70+ (vararray int2 & notNullable) `as` #vec )

71+ ( primaryKey #id `as` #pk_users

72+ :* unique #name `as` #unique_names )

73+ >>>

74+ createTable #emails

75+ ( serial `as` #id :*

76+ (int & notNullable) `as` #user_id :*

77+ (text & nullable) `as` #email )

78+ ( primaryKey #id `as` #pk_emails :*

79+ foreignKey #user_id #users #id

80+ OnDeleteCascade OnUpdateCascade `as` #fk_user_id )

81+

82+teardown :: Definition Schemas (Public '[])

83+teardown = dropTable #emails >>> dropTable #users

84+

85+migration :: Migration IO (Public '[]) Schemas

86+migration = Migration { name = "test"

87+ , up = void $ define setup

88+ , down = void $ define teardown }

89+

90+setupDB :: IO ()

91+setupDB = void . withConnection connectionString $

92+ manipulate (UnsafeManipulation "SET client_min_messages TO WARNING;")

93+ & pqThen (migrateUp (single migration))

94+

95+dropDB :: IO ()

96+dropDB = void . withConnection connectionString $

97+ manipulate (UnsafeManipulation "SET client_min_messages TO WARNING;")

98+ & pqThen (migrateDown (single migration))

99+

100+connectionString :: Char8.ByteString

101+connectionString = "host=localhost port=5432 dbname=exampledb"

102+

103+testUser :: User

104+testUser = User "TestUser" Nothing (VarArray [])

105+

106+newUser :: (MonadBase IO m, MonadPQ Schemas m) => User -> m ()

107+newUser u = void $ manipulateParams insertUser (userName u, userVec u)

108+

109+insertUserTwice :: (MonadBase IO m, MonadPQ Schemas m) => m ()

110+insertUserTwice = newUser testUser >> newUser testUser

111+

112+specs :: SpecWith ()

113+specs = before_ setupDB $ after_ dropDB $

114+ describe "Exceptions" $ do

115+

116+ let

117+ dupKeyErr = PQException FatalError (Just "23505")

118+ (Just "ERROR: duplicate key value violates unique constraint \"unique_names\"\nDETAIL: Key (name)=(TestUser) already exists.\n")

119+

120+ it "should be thrown for unique constraint violation in a manipulation" $

121+ withConnection connectionString insertUserTwice

122+ `shouldThrow` (== dupKeyErr)

123+

124+ it "should be rethrown for unique constraint violation in a manipulation by a transaction" $

125+ withConnection connectionString (transactionally_ insertUserTwice)

126+ `shouldThrow` (== dupKeyErr)

squeal-postgresql/test/Specs/Specs.hsnew file+7

@@ -0,0 +1,7 @@

1+module Specs where

3+import Test.Hspec

4+import qualified ExceptionHandling

6+main :: IO ()

7+main = hspec ExceptionHandling.specs

stack.yaml+1−6

@@ -1,8 +1,3 @@

1−resolver: nightly-2019-07-14

1+resolver: lts-13.8

22packages:

33- squeal-postgresql

4−

5−extra-deps:

6−- unliftio-pool-0.2.1.0

7−- github: morphismtech/free-categories

8− commit: c0e555fbefb5c21619e532264c4dfeac556d0630