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.circleci/config.yml+1−1

since splitsnapshots

unifiedsplit

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

2jobs:

3 build:

4 docker:

5− - image: haskell:8.6.5

5+ - image: haskell:8.6.3

6 - image: circleci/postgres:latest

7 environment:

8 POSTGRES_USER: root

README.md+75−64

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

46* transactions

47* views

48* array, composite and enumerated types

49−* json functions and operations

49+* json operations

50−* multischema support

51−* correlated subqueries

52−* window functions

53−* text search

55## installation

51## installation

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

76features.

72features.

78```Haskell

74```Haskell

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

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

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

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

81```

77```

83We'll need some imports.

79We'll need some imports.

85```Haskell

81```Haskell

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

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

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

87>>> import Data.Int (Int32)

84>>> import Data.Int (Int32)

88>>> import Data.Text (Text)

85>>> import Data.Text (Text)

89>>> import Squeal.PostgreSQL

86>>> import Squeal.PostgreSQL

87+>>> import Squeal.PostgreSQL.Render

90```

88```

92We'll use generics to easily convert between Haskell and PostgreSQL values.

90We'll use generics to easily convert between Haskell and PostgreSQL values.

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

101

102```Haskell

100```Haskell

103>>> :{

101>>> :{

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"] ]

115type Schema =

102type Schema =

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

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

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

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

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

107+ ])

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

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

118−type Schemas = Public Schema

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+ ]

119:}

117:}

120```

118```

121

119

122Notice the use of type operators.

120Notice the use of type operators.

123

121

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

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

125a `TableConstraint` or a `ColumnType`. It is intended to connote Haskell's `::`

123a `TableConstraint` or a `ColumnType`. It is intended to connote Haskell's `::`

126operator.

124operator.

127

125

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

130yielding a `ColumnType`. It is intended to connote Haskell's `=>` operator

128yielding a `ColumnType`. It is intended to connote Haskell's `=>` operator

131

129

132Next, we'll write `Definition`s to set up and tear down the schema. In

130Next, 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`

134has two type parameters, corresponding to the schema

132has two type parameters, corresponding to the schema

135before being run and the schema after. We can compose definitions using `>>>`.

133before being run and the schema after. We can compose definitions using `>>>`.

136Here and in the rest of our commands we make use of overloaded

134Here 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.

139```Haskell

137```Haskell

140>>> :{

138>>> :{

141let

139let

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

140+ setup :: Definition '[] Schema

143− setup =

141+ setup =

144 createTable #users

142 createTable #users

145 ( serial `as` #id :*

143 ( serial `as` #id :*

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

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

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

171```Haskell

169```Haskell

172>>> :{

170>>> :{

173let

171let

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

172+ teardown :: Definition Schema '[]

175 teardown = dropTable #emails >>> dropTable #users

173 teardown = dropTable #emails >>> dropTable #users

176:}

174:}

177

175

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

180DROP TABLE "users";

178DROP TABLE "users";

181```

179```

182

180

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.

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

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

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

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

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

195−and an output row. When

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

196we insert into the users table, we will need a parameter for the `name`

185we insert into the users table, we will need a parameter for the `name`

197field but not for the `id` field. Since it's serial, we can use a default

186field but not for the `id` field. Since it's serial, we can use a default

198value. However, since the emails table refers to the users table, we will

187value. However, since the emails table refers to the users table, we will

199need to retrieve the user id that the insert generates and insert it into

188need 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

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

201−`with` statement.

190+of our inserts.

202

191

203```Haskell

192```Haskell

204>>> :{

193>>> :{

205let

194let

206− insertUser :: Manipulation_ Schemas User ()

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

207− insertUser = with (u `as` #u) e

196+ insertUser = insertRow #users

208− where

209− u = insertInto #users

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

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

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

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

212− e = insertInto_ #emails $ Select

199+:}

200+

201+>>> :{

202+let

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

204+ insertEmail = insertRow #emails

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

205+ ( Default `as` #id :*

214− (from (common #u))

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

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

208+ OnConflictDoNothing (Returning Nil)

215:}

209:}

216

210

217>>> printSQL insertUser

211>>> 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

219```

215```

220

216

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

222interested in the ids here, just the usernames and email addresses. We

218interested 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

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

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

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

225

221

226```Haskell

222```Haskell

227>>> :{

223>>> :{

228let

224let

229− getUsers :: Query_ Schemas () User

225+ getUsers :: Query Schema '[]

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

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

230− getUsers = select_

228+ getUsers = select

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

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

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

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

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

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

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

238SELECT "u"."name" AS "userName", "e"."email" AS "userEmail" FROM "users" AS "u" INNER JOIN "emails" AS "e" ON ("u"."id" = "e"."user_id")

236SELECT "u"."name" AS "userName", "e"."email" AS "userEmail" FROM "users" AS "u" INNER JOIN "emails" AS "e" ON ("u"."id" = "e"."user_id")

239```

237```

240

238

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+

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

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

242

252

243```Haskell

253```Haskell

244>>> :{

254>>> :{

245let

255let

246 users :: [User]

256 users :: [User]

247− users =

257+ users =

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

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

249 , User "Bob" Nothing

259 , User "Bob" Nothing

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

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

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

263```Haskell

273```Haskell

264>>> :{

274>>> :{

265let

275let

266− session :: PQ Schemas Schemas IO ()

276+ session :: PQ Schema Schema IO ()

267 session = do

277 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))

269 usersResult <- runQuery getUsers

281 usersResult <- runQuery getUsers

270 usersRows <- getRows usersResult

282 usersRows <- getRows usersResult

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

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

272in

284in

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

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

274 define setup

286 define setup

275 & pqThen session

287 & pqThen session

276 & pqThen (define teardown)

288 & pqThen (define teardown)

277:}

289:}

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

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

279−-}

280```

291```

RELEASE NOTES.md−400

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

1## 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−

403### Version 0.4

3### Version 0.4

404

405Version 0.4 strengthens Squeal's type system, adds

5Version 0.4 strengthens Squeal's type system, adds

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

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

12module Main (main, main2) where

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

14+import Control.Monad (void)

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

15import Data.Int (Int16, Int32)

16import Data.Int (Int16, Int32)

16import Data.Monoid ((<>))

17import Data.Monoid ((<>))

17import Data.Text (Text)

18import Data.Text (Text)

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

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

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

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

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

40 ])

41 ])

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

42 ]

44type Schemas = Public Schema

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

53 >>>

54 createTable #emails

55 ( serial `as` #id :*

56− hask @Int32 `as` #user_id :*

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

57− hask @(Maybe Text) `as` #email )

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

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

59 foreignKey #user_id #users #id

60 OnDeleteCascade OnUpdateCascade `as` #fk_user_id )

61− >>>

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

64teardown :: Definition Schemas (Public '[])

62teardown :: Definition Schemas (Public '[])

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

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

67insertUser :: Manipulation_ Schemas (Text, VarArray (Vector (Maybe Int16))) (Only Int32)

65insertUser :: Manipulation_ Schemas (Text, VarArray (Vector (Maybe Int16))) (Only Int32)

68insertUser = insertInto #users

66insertUser = 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))

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

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

72insertEmail :: Manipulation_ Schemas (Int32, Maybe Text) ()

70insertEmail :: Manipulation_ Schemas (Int32, Maybe Text) ()

73insertEmail = insertInto_ #emails

71insertEmail = 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))

76getUsers :: Query_ Schemas () User

74getUsers :: Query_ Schemas () User

77getUsers = select_

75getUsers = select_

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

86instance SOP.HasDatatypeInfo User

84instance SOP.HasDatatypeInfo User

88users :: [User]

86users :: [User]

89−users =

87+users =

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

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

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

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

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

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

93 ]

91 ]

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

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

96session = do

94session = do

97− liftIO $ Char8.putStrLn "manipulating"

95+ liftBase $ Char8.putStrLn "manipulating"

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

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

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

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

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

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

101− liftIO $ Char8.putStrLn "querying"

99+ liftBase $ Char8.putStrLn "querying"

102 usersResult <- runQuery getUsers

100 usersResult <- runQuery getUsers

103 usersRows <- getRows usersResult

101 usersRows <- getRows usersResult

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

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

105

103

106main :: IO ()

104main :: IO ()

107main = do

105main = do

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

119

117

120main2 :: IO ()

118main2 :: IO ()

121main2 =

119main2 =

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

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

123 define setup

121 define setup

124 & pqThen session

122 & pqThen session

125 & pqThen (define teardown)

123 & pqThen (define teardown)

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

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

1name: squeal-postgresql

2−version: 0.5.1.0

2+version: 0.4.9.0

3synopsis: Squeal PostgreSQL Library

4description: Squeal is a type-safe embedding of PostgreSQL in Haskell

5homepage: https://github.com/morphismtech/squeal

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

22 hs-source-dirs: src

23 exposed-modules:

24 Squeal.PostgreSQL

25− Squeal.PostgreSQL.Alias

26 Squeal.PostgreSQL.Binary

25 Squeal.PostgreSQL.Binary

27 Squeal.PostgreSQL.Definition

26 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

35 Squeal.PostgreSQL.Expression

27 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

55 Squeal.PostgreSQL.Manipulation

28 Squeal.PostgreSQL.Manipulation

56 Squeal.PostgreSQL.Migration

29 Squeal.PostgreSQL.Migration

57 Squeal.PostgreSQL.Pool

30 Squeal.PostgreSQL.Pool

58− Squeal.PostgreSQL.PG

59 Squeal.PostgreSQL.PQ

31 Squeal.PostgreSQL.PQ

60 Squeal.PostgreSQL.Render

32 Squeal.PostgreSQL.Render

61 Squeal.PostgreSQL.Query

33 Squeal.PostgreSQL.Query

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

70 , bytestring >= 0.10.8.2

42 , bytestring >= 0.10.8.2

71 , bytestring-strict-builder >= 0.4.5

43 , bytestring-strict-builder >= 0.4.5

72 , deepseq >= 1.4.3.0

44 , 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

75 , mmorph >= 1.1.1

47 , mmorph >= 1.1.1

48+ , monad-control >= 1.0.2.3

76 , mtl >= 2.2.2

49 , mtl >= 2.2.2

77 , network-ip >= 0.3.0.2

50 , network-ip >= 0.3.0.2

78 , postgresql-binary >= 0.12.1

51 , postgresql-binary >= 0.12.1

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

83 , text >= 1.2.3.0

56 , text >= 1.2.3.0

84 , time >= 1.8.0.2

57 , time >= 1.8.0.2

85 , transformers >= 0.5.2.0

58 , transformers >= 0.5.2.0

86− , unliftio >= 0.2.10

59+ , transformers-base >= 0.4.4

87− , unliftio-pool >= 0.2.1.0

88 , uuid-types >= 1.0.3

60 , uuid-types >= 1.0.3

89 , vector >= 0.12.0.1

61 , vector >= 0.12.0.1

91−test-suite doctest

63+test-suite squeal-postgresql-doctest

92 default-language: Haskell2010

64 default-language: Haskell2010

93 type: exitcode-stdio-1.0

65 type: exitcode-stdio-1.0

94 hs-source-dirs: test

66 hs-source-dirs: test

95 ghc-options: -Wall

67 ghc-options: -Wall

96− main-is: Doc.hs

68+ main-is: DocTest.hs

97 build-depends:

69 build-depends:

98 base >= 4.10.0.0

70 base >= 4.10.0.0

99 , doctest >= 0.11.4

71 , doctest >= 0.11.4

100− , squeal-postgresql

101

102−test-suite properties

73+test-suite squeal-postgresql-specs

103 default-language: Haskell2010

74 default-language: Haskell2010

104 type: exitcode-stdio-1.0

75 type: exitcode-stdio-1.0

105− hs-source-dirs: test

76+ hs-source-dirs: test/Specs

106− ghc-options: -Wall

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

107− main-is: Property.hs

78+ main-is: Specs.hs

79+ other-modules: ExceptionHandling

108 build-depends:

80 build-depends:

109 base >= 4.10.0.0

81 base >= 4.10.0.0

110 , bytestring >= 0.10.8.2

82 , 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

127 , generics-sop >= 0.3.1.0

83 , generics-sop >= 0.3.1.0

128 , hspec >= 2.4.8

84 , hspec >= 2.4.8

129− , mtl >= 2.2.2

130 , squeal-postgresql

85 , squeal-postgresql

131 , text >= 1.2.2.2

86 , text >= 1.2.2.2

87+ , transformers >= 0.5.2.0

88+ , transformers-base >= 0.4.4

132 , vector >= 0.12.0.1

89 , vector >= 0.12.0.1

133

134−executable example

91+executable squeal-postgresql-example

135 default-language: Haskell2010

92 default-language: Haskell2010

136 hs-source-dirs: exe

93 hs-source-dirs: exe

137 ghc-options: -Wall

94 ghc-options: -Wall

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

144 , squeal-postgresql

101 , squeal-postgresql

145 , text >= 1.2.2.2

102 , text >= 1.2.2.2

146 , transformers >= 0.5.2.0

103 , transformers >= 0.5.2.0

104+ , transformers-base >= 0.4.4

147 , vector >= 0.12.0.1

105 , vector >= 0.12.0.1

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

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

1{-|

2Module: Squeal.PostgreSQL

3−Description: Squeal export module

3+Description: Squeel export module

4−Copyright: (c) Eitan Chatav, 2019

4+Copyright: (c) Eitan Chatav, 2017

5Maintainer: eitan@morphism.tech

6Stability: experimental

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

11First, we need some language extensions because Squeal uses modern GHC

12features.

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

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

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

17We'll need some imports.

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

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

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

20>>> import Data.Int (Int32)

21>>> import Data.Int (Int32)

21>>> import Data.Text (Text)

22>>> import Data.Text (Text)

22>>> import Squeal.PostgreSQL

23>>> import Squeal.PostgreSQL

24+>>> import Squeal.PostgreSQL.Render

24We'll use generics to easily convert between Haskell and PostgreSQL values.

26We'll use generics to easily convert between Haskell and PostgreSQL values.

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

58yielding a `ColumnType`. It is intended to connote Haskell's @=>@ operator

60yielding a `ColumnType`. It is intended to connote Haskell's @=>@ operator

60Next, we'll write `Definition`s to set up and tear down the schema. In

62Next, 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`

62has two type parameters, corresponding to the schema

64has two type parameters, corresponding to the schema

63before being run and the schema after. We can compose definitions using `>>>`.

65before being run and the schema after. We can compose definitions using `>>>`.

64Here and in the rest of our commands we make use of overloaded

66Here 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.

67>>> :{

69>>> :{

68let

70let

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

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

70− setup =

72+ setup =

71 createTable #users

73 createTable #users

72 ( serial `as` #id :*

74 ( serial `as` #id :*

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

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

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

102DROP TABLE "emails";

104DROP TABLE "emails";

103DROP TABLE "users";

105DROP TABLE "users";

104

106

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.

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

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

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

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

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

115−and an output row. When

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

116we insert into the users table, we will need a parameter for the @name@

111we insert into the users table, we will need a parameter for the @name@

117field but not for the @id@ field. Since it's serial, we can use a default

112field but not for the @id@ field. Since it's serial, we can use a default

118value. However, since the emails table refers to the users table, we will

113value. However, since the emails table refers to the users table, we will

119need to retrieve the user id that the insert generates and insert it into

114need 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

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

121−`with` statement.

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

122

126

123>>> :{

127>>> :{

124let

128let

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

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

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

127 where

131 where

128 u = insertInto #users

132 u = insertInto #users

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

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

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

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

131− e = insertInto_ #emails $ Select

135+ e = insertInto_ #emails

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

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

133− (from (common #u))

134:}

137:}

135

138

136>>> printSQL insertUser

139>>> printSQL insertUser

137WITH "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"

140WITH "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"

138

141

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

140interested in the ids here, just the usernames and email addresses. We

143interested 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

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

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

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

143

146

144>>> :{

147>>> :{

145let

148let

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

159>>> :{

162>>> :{

160let

163let

161 users :: [User]

164 users :: [User]

162− users =

165+ users =

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

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

164 , User "Bob" Nothing

167 , User "Bob" Nothing

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

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

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

181 _ <- traversePrepared_ insertUser users

184 _ <- traversePrepared_ insertUser users

182 usersResult <- runQuery getUsers

185 usersResult <- runQuery getUsers

183 usersRows <- getRows usersResult

186 usersRows <- getRows usersResult

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

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

185in

188in

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

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

187 define setup

190 define setup

188 & pqThen session

191 & pqThen session

189 & pqThen (define teardown)

192 & pqThen (define teardown)

190:}

193:}

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

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

192-}

195-}

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

196+module Squeal.PostgreSQL

194−

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+

195−import Squeal.PostgreSQL.Alias as X

207+import Squeal.PostgreSQL.Binary

196−import Squeal.PostgreSQL.Binary as X

197−import Squeal.PostgreSQL.Definition as X

208+import Squeal.PostgreSQL.Definition

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

209+import Squeal.PostgreSQL.Expression

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

210+import Squeal.PostgreSQL.Manipulation

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

211+import Squeal.PostgreSQL.PQ

230−import Squeal.PostgreSQL.Query as X

212+import Squeal.PostgreSQL.Query

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

232−import Squeal.PostgreSQL.Schema as X

213+import Squeal.PostgreSQL.Schema

233−import Squeal.PostgreSQL.Transaction as X

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+332−221

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

16>>> import Data.Int (Int16)

17>>> import Data.Text (Text)

18>>> import Control.Monad (void)

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

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

20>>> import Squeal.PostgreSQL

22Define 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.

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

41>>> :{

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

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

43 result <- runQueryParams roundTrip input

44 Just output <- firstRow result

45− liftIO . print $ input == output

45+ liftBase . print $ input == output

46:}

47True

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

78>>> :set -XOverloadedLists

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

80>>> :{

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

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

82 result <- runQueryParams roundTrip input

83 Just output <- firstRow result

84− liftIO . print $ input == output

84+ liftBase . print $ input == output

85:}

86True

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

168 session = do

169 result <- runQueryParams roundTrip input

170 Just output <- firstRow result

171− liftIO . print $ input == output

171+ liftBase . print $ input == output

172in

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

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

174 define setup

175 & pqThen session

176 & pqThen (define teardown)

@@ -202,37 +202,45 @@ True

202#-}

203

204module Squeal.PostgreSQL.Binary

205+ ( -- * PG type families

206+ PG

207+ , NullPG

208+ , TuplePG

209+ , RowPG

210+ , LabelsPG

211+ -- * Storage newtypes

212+ , Money (..)

213+ , Json (..)

214+ , Jsonb (..)

215+ , Composite (..)

216+ , Enumerated (..)

217+ , VarArray (..)

218+ , FixArray (..)

205− ( -- * Encoding

219+ -- * Encoding

206− ToParam (..)

220+ , ToParam (..)

207 , ToParams (..)

221 , ToParams (..)

208− , ToNullityParam (..)

209− , ToField (..)

210− , ToFixArray (..)

211 -- * Decoding

222 -- * Decoding

212 , FromValue (..)

223 , FromValue (..)

213 , FromRow (..)

224 , FromRow (..)

214− , FromField (..)

215− , FromFixArray (..)

216 -- * Only

225 -- * Only

217 , Only (..)

226 , Only (..)

218− -- * Oid

227+ , P (..)

219− , OidOf (..)

220− , OidOfParam (..)

221− , OidOfField (..)

222 ) where

228 ) where

223

229

224import BinaryParser

230import BinaryParser

225import ByteString.StrictBuilder (builderLength, int32BE, int64BE, word32BE)

231import ByteString.StrictBuilder (builderLength, int32BE, int64BE, word32BE)

226import Control.Arrow (left)

232import Control.Arrow (left)

227import Control.Monad

233import Control.Monad

234+import Data.Aeson (Value)

235+import Data.ByteString (ByteString)

228import Data.Int

236import Data.Int

229import Data.Kind

237import Data.Kind

230import Data.Scientific

238import Data.Scientific

239+import Data.Text (Text)

231import Data.Time

240import Data.Time

232import Data.UUID.Types

241import Data.UUID.Types

233import Data.Vector (Vector)

242import Data.Vector (Vector)

234import Data.Word

243import Data.Word

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

236import Generics.SOP

244import Generics.SOP

237import Generics.SOP.Record

245import Generics.SOP.Record

238import GHC.TypeLits

246import GHC.TypeLits

@@ -246,14 +254,11 @@ import qualified Data.Text.Lazy as Lazy (Text)

246import qualified Data.Text as Strict (Text)

254import qualified Data.Text as Strict (Text)

247import qualified Data.Text as Strict.Text

255import qualified Data.Text as Strict.Text

248import qualified Data.Vector as Vector

256import qualified Data.Vector as Vector

249−import qualified Database.PostgreSQL.LibPQ as LibPQ

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

250import qualified GHC.Generics as GHC

258import qualified GHC.Generics as GHC

251import qualified PostgreSQL.Binary.Decoding as Decoding

259import qualified PostgreSQL.Binary.Decoding as Decoding

252import qualified PostgreSQL.Binary.Encoding as Encoding

260import qualified PostgreSQL.Binary.Encoding as Encoding

253

261

254−import Squeal.PostgreSQL.Alias

255−import Squeal.PostgreSQL.List

256−import Squeal.PostgreSQL.PG

257import Squeal.PostgreSQL.Schema

262import Squeal.PostgreSQL.Schema

258

263

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

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

@@ -277,9 +282,11 @@ class ToParam (x :: Type) (pg :: PGType) where

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

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

278instance ToParam Bool 'PGbool where toParam = K . Encoding.bool

283instance ToParam Bool 'PGbool where toParam = K . Encoding.bool

279instance ToParam Int16 'PGint2 where toParam = K . Encoding.int2_int16

284instance ToParam Int16 'PGint2 where toParam = K . Encoding.int2_int16

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

280instance ToParam Int32 'PGint4 where toParam = K . Encoding.int4_int32

286instance ToParam Int32 'PGint4 where toParam = K . Encoding.int4_int32

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

281instance ToParam Int64 'PGint8 where toParam = K . Encoding.int8_int64

288instance ToParam Int64 'PGint8 where toParam = K . Encoding.int8_int64

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

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

283instance ToParam Float 'PGfloat4 where toParam = K . Encoding.float4

290instance ToParam Float 'PGfloat4 where toParam = K . Encoding.float4

284instance ToParam Double 'PGfloat8 where toParam = K . Encoding.float8

291instance ToParam Double 'PGfloat8 where toParam = K . Encoding.float8

285instance ToParam Scientific 'PGnumeric where toParam = K . Encoding.numeric

292instance ToParam Scientific 'PGnumeric where toParam = K . Encoding.numeric

@@ -312,26 +319,24 @@ instance Aeson.ToJSON x => ToParam (Json x) 'PGjson where

312instance Aeson.ToJSON x => ToParam (Jsonb x) 'PGjsonb where

319instance Aeson.ToJSON x => ToParam (Jsonb x) 'PGjsonb where

313 toParam = K . Encoding.jsonb_bytes

320 toParam = K . Encoding.jsonb_bytes

314 . Lazy.ByteString.toStrict . Aeson.encode . getJsonb

321 . Lazy.ByteString.toStrict . Aeson.encode . getJsonb

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

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

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

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

317 toParam = K

324 toParam = K

318− . Encoding.array_foldable

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

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

320 . getVarArray

326 . getVarArray

321−instance (ToParam x pg, OidOf pg)

327+instance (ToParam x pg, HasOid pg)

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

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

323 toParam = K

329 toParam = K

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

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

325 . getVarArray

331 . getVarArray

326−instance (ToParam x pg, OidOf pg)

332+instance (ToParam x pg, HasOid pg)

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

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

328 toParam = K

334 toParam = K

329− . Encoding.nullableArray_vector

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

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

331 . getVarArray

336 . getVarArray

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

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

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

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

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

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

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

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

336instance

341instance

337 ( IsEnumType x

342 ( IsEnumType x

@@ -356,7 +361,7 @@ instance

356 ( SListI fields

361 ( SListI fields

357 , IsRecord x xs

362 , IsRecord x xs

358 , AllZip ToField xs fields

363 , AllZip ToField xs fields

359− , All OidOfField fields

364+ , All HasAliasedOid fields

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

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

361 toParam =

366 toParam =

362 let

367 let

@@ -364,7 +369,7 @@ instance

364 encoders = htrans (Proxy @ToField) toField

369 encoders = htrans (Proxy @ToField) toField

365

370

366 composite

371 composite

367− :: All OidOfField row

372+ :: All HasAliasedOid row

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

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

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

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

370 composite fields = K $

375 composite fields = K $

@@ -381,142 +386,27 @@ instance

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

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

382 let

387 let

383 each

388 each

384− :: OidOfField field

389+ :: HasAliasedOid field

385 => K (Maybe Encoding.Encoding) field

390 => K (Maybe Encoding.Encoding) field

386 -> Encoding.Encoding

391 -> Encoding.Encoding

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

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

388− word32BE (getOid (oidOfField @field))

393+ word32BE (aliasedOid @field)

389 <> case field of

394 <> case field of

390 Nothing -> int64BE (-1)

395 Nothing -> int64BE (-1)

391 Just value ->

396 Just value ->

392 int32BE (fromIntegral (builderLength value))

397 int32BE (fromIntegral (builderLength value))

393 <> value

398 <> value

394 in

399 in

395− hcfoldMap (Proxy @OidOfField) each fields

400+ hcfoldMap (Proxy @HasAliasedOid) each fields

396

401

397 in

402 in

398 composite . encoders . toRecord . getComposite

403 composite . encoders . toRecord . getComposite

399

404

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

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

514− oidOfField :: Oid

406+ aliasedOid :: Word32

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

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

516− oidOfField = oidOf @ty

408+ aliasedOid = oid @ty

517−

409+

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

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

520class ToNullityParam (x :: Type) (ty :: NullityType) where

410class ToNullityParam (x :: Type) (ty :: NullityType) where

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

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

522instance ToParam x pg => ToNullityParam x ('NotNull pg) where

412instance ToParam x pg => ToNullityParam x ('NotNull pg) where

@@ -524,19 +414,11 @@ instance ToParam x pg => ToNullityParam x ('NotNull pg) where

524instance ToParam x pg => ToNullityParam (Maybe x) ('Null pg) where

414instance ToParam x pg => ToNullityParam (Maybe x) ('Null pg) where

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

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

526

416

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.

531class ToField (x :: (Symbol, Type)) (field :: (Symbol, NullityType)) where

417class ToField (x :: (Symbol, Type)) (field :: (Symbol, NullityType)) where

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

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

533instance ToNullityParam x ty => ToField (alias ::: x) (alias ::: ty) where

419instance ToNullityParam x ty => ToField (alias ::: x) (alias ::: ty) where

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

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

535

421

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.

540class ToFixArray (x :: Type) (dims :: [Nat]) (array :: NullityType) where

422class ToFixArray (x :: Type) (dims :: [Nat]) (array :: NullityType) where

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

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

542instance ToNullityParam x ty => ToFixArray x '[] ty where

424instance ToNullityParam x ty => ToFixArray x '[] ty where

@@ -582,7 +464,6 @@ instance FromValue 'PGbool Bool where fromValue = Decoding.bool

582instance FromValue 'PGint2 Int16 where fromValue = Decoding.int

464instance FromValue 'PGint2 Int16 where fromValue = Decoding.int

583instance FromValue 'PGint4 Int32 where fromValue = Decoding.int

465instance FromValue 'PGint4 Int32 where fromValue = Decoding.int

584instance FromValue 'PGint8 Int64 where fromValue = Decoding.int

466instance FromValue 'PGint8 Int64 where fromValue = Decoding.int

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

586instance FromValue 'PGfloat4 Float where fromValue = Decoding.float4

467instance FromValue 'PGfloat4 Float where fromValue = Decoding.float4

587instance FromValue 'PGfloat8 Double where fromValue = Decoding.float8

468instance FromValue 'PGfloat8 Double where fromValue = Decoding.float8

588instance FromValue 'PGnumeric Scientific where fromValue = Decoding.numeric

469instance FromValue 'PGnumeric Scientific where fromValue = Decoding.numeric

@@ -721,10 +602,6 @@ instance FromValue pg y

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

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

722 Decoding.valueParser (fromValue @pg) bytestring

603 Decoding.valueParser (fromValue @pg) bytestring

723

604

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.

728class FromFixArray (dims :: [Nat]) (ty :: NullityType) (y :: Type) where

605class FromFixArray (dims :: [Nat]) (ty :: NullityType) (y :: Type) where

729 fromFixArray :: Decoding.Array y

606 fromFixArray :: Decoding.Array y

730instance FromValue pg y => FromFixArray '[] ('NotNull pg) y where

607instance FromValue pg y => FromFixArray '[] ('NotNull pg) y where

@@ -769,53 +646,50 @@ instance

769 = fmap fromRecord

646 = fmap fromRecord

770 . hsequence'

647 . hsequence'

771 . htrans (Proxy @FromField) fromField

648 . htrans (Proxy @FromField) fromField

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

773−-- P records

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

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

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

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

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

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

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

778−-- instance

652+instance

779−-- ( row ~ Join row1 row2

653+ ( row ~ Join row1 row2

780−-- , FromRow row1 hask1

654+ , FromRow row1 hask1

781−-- , FromRow row2 hask2

655+ , FromRow row2 hask2

782−-- , SListI row

656+ , SListI row

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

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

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

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

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

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

786−-- instance

660+instance

787−-- ( row ~ Join row1 row23

661+ ( row ~ Join row1 row23

788−-- , FromRow row1 hask1

662+ , FromRow row1 hask1

789−-- , FromRow row23 (hask2, hask3)

663+ , FromRow row23 (hask2, hask3)

790−-- , SListI row

664+ , SListI row

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

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

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

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

793−-- (row1, row23) -> do

667+ (row1, row23) -> do

794−-- hask1 <- fromRow row1

668+ hask1 <- fromRow row1

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

669+ (hask2, hask3) <- fromRow row23

796−-- return (hask1, hask2, hask3)

670+ return (hask1, hask2, hask3)

797−-- instance

671+instance

798−-- ( row ~ Join row1 row234

672+ ( row ~ Join row1 row234

799−-- , FromRow row1 hask1

673+ , FromRow row1 hask1

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

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

801−-- , SListI row

675+ , SListI row

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

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

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

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

804−-- (row1, row234) -> do

678+ (row1, row234) -> do

805−-- hask1 <- fromRow row1

679+ hask1 <- fromRow row1

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

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

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

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

808−-- instance

682+instance

809−-- ( row ~ Join row1 row2345

683+ ( row ~ Join row1 row2345

810−-- , FromRow row1 hask1

684+ , FromRow row1 hask1

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

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

812−-- , SListI row

686+ , SListI row

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

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

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

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

815−-- (row1, row2345) -> do

689+ (row1, row2345) -> do

816−-- hask1 <- fromRow row1

690+ hask1 <- fromRow row1

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

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

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

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

819

693

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

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

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

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

@@ -844,5 +718,242 @@ replicateMN

844replicateMN mx = hsequence' $

718replicateMN mx = hsequence' $

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

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

846

720

847−getOid :: LibPQ.Oid -> Word32

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

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

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

723+@Money { cents = 200020 }@.

724+

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

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

727+>>> import Squeal.PostgreSQL

728+>>> :{

729+let

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

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

732+:}

733+

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

735+

736+>>> :{

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

738+ result <- runQueryParams roundTrip input

739+ Just output <- firstRow result

740+ liftBase . print $ input == output

741+:}

742+True

743+-}

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

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

746+type instance PG Money = 'PGmoney

747+

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

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

750+-}

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

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

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

754+

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

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

757+-}

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

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

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

761+

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

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

764+-}

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

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

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

768+

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

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

771+-}

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

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

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

775+

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

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

778+-}

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

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

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

782+

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

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

785+-}

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

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

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

789+

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

791+ DimPG (x,x) = 2 ': DimPG x

792+ DimPG (x,x,x) = 3 ': DimPG x

793+ DimPG (x,x,x,x) = 4 ': DimPG x

794+ DimPG (x,x,x,x,x) = 5 ': DimPG x

795+ DimPG (x,x,x,x,x,x) = 6 ': DimPG x

796+ DimPG (x,x,x,x,x,x,x) = 7 ': DimPG x

797+ DimPG (x,x,x,x,x,x,x,x) = 8 ': DimPG x

798+ DimPG (x,x,x,x,x,x,x,x,x) = 9 ': DimPG x

799+ DimPG (x,x,x,x,x,x,x,x,x,x) = 10 ': DimPG x

800+ DimPG x = '[]

801+

802+type family FixPG (hask :: Type) :: NullityType where

803+ FixPG (x,x) = FixPG x

804+ FixPG (x,x,x) = FixPG x

805+ FixPG (x,x,x,x) = FixPG x

806+ FixPG (x,x,x,x,x) = FixPG x

807+ FixPG (x,x,x,x,x,x) = FixPG x

808+ FixPG (x,x,x,x,x,x,x) = FixPG x

809+ FixPG (x,x,x,x,x,x,x,x) = FixPG x

810+ FixPG (x,x,x,x,x,x,x,x,x) = FixPG x

811+ FixPG (x,x,x,x,x,x,x,x,x,x) = FixPG x

812+ FixPG (x,x,x,x,x,x,x,x,x,x,x) = FixPG x

813+ FixPG x = NullPG x

814+

815+{- | The `PG` type family embeds a subset of Haskell types

816+as Postgres types. As an open type family, `PG` is extensible.

817+

818+>>> :kind! PG LocalTime

819+PG LocalTime :: PGType

820+= 'PGtimestamp

821+

822+>>> newtype MyDouble = My Double

823+>>> :set -XTypeFamilies

824+>>> type instance PG MyDouble = 'PGfloat8

825+-}

826+type family PG (hask :: Type) :: PGType

827+type instance PG Bool = 'PGbool

828+type instance PG Int16 = 'PGint2

829+type instance PG Int32 = 'PGint4

830+type instance PG Int64 = 'PGint8

831+type instance PG Word16 = 'PGint2

832+type instance PG Word32 = 'PGint4

833+type instance PG Word64 = 'PGint8

834+type instance PG Scientific = 'PGnumeric

835+type instance PG Float = 'PGfloat4

836+type instance PG Double = 'PGfloat8

837+type instance PG Char = 'PGchar 1

838+type instance PG Text = 'PGtext

839+type instance PG Lazy.Text = 'PGtext

840+type instance PG String = 'PGtext

841+type instance PG ByteString = 'PGbytea

842+type instance PG Lazy.ByteString = 'PGbytea

843+type instance PG LocalTime = 'PGtimestamp

844+type instance PG UTCTime = 'PGtimestamptz

845+type instance PG Day = 'PGdate

846+type instance PG TimeOfDay = 'PGtime

847+type instance PG (TimeOfDay, TimeZone) = 'PGtimetz

848+type instance PG DiffTime = 'PGinterval

849+type instance PG UUID = 'PGuuid

850+type instance PG (NetAddr IP) = 'PGinet

851+type instance PG Value = 'PGjson

852+

853+{-| The `LabelsPG` type family calculates the constructors of a

854+Haskell enum type.

855+

856+>>> data Schwarma = Beef | Lamb | Chicken deriving GHC.Generic

857+>>> instance Generic Schwarma

858+>>> instance HasDatatypeInfo Schwarma

859+>>> :kind! LabelsPG Schwarma

860+LabelsPG Schwarma :: [Type.ConstructorName]

861+= '["Beef", "Lamb", "Chicken"]

862+-}

863+type family LabelsPG (hask :: Type) :: [Type.ConstructorName] where

864+ LabelsPG hask =

865+ ConstructorNamesOf (ConstructorsOf (DatatypeInfoOf hask))

866+

867+{- | `RowPG` turns a Haskell record type into a `RowType`.

868+

869+>>> data Person = Person { name :: Text, age :: Int32 } deriving GHC.Generic

870+>>> instance Generic Person

871+>>> instance HasDatatypeInfo Person

872+>>> :kind! RowPG Person

873+RowPG Person :: [(Symbol, NullityType)]

874+= '["name" ::: 'NotNull 'PGtext, "age" ::: 'NotNull 'PGint4]

875+-}

876+type family RowPG (hask :: Type) :: RowType where

877+ RowPG (hask1, hask2) = Join (RowPG hask1) (RowPG hask2)

878+ RowPG (hask1, hask2, hask3) =

879+ Join (RowPG hask1) (RowPG (hask2, hask3))

880+ RowPG (hask1, hask2, hask3, hask4) =

881+ Join (RowPG hask1) (RowPG (hask2, hask3, hask4))

882+ RowPG (hask1, hask2, hask3, hask4, hask5) =

883+ Join (RowPG hask1) (RowPG (hask2, hask3, hask4, hask5))

884+ RowPG (P (col ::: head)) = '[col ::: NullPG head]

885+ RowPG hask = RowOf (RecordCodeOf hask)

886+

887+type family RowOf (fields :: [(Symbol, Type)]) :: RowType where

888+ RowOf '[] = '[]

889+ RowOf (field ': fields) = FieldPG field ': RowOf fields

890+

891+type family FieldPG (field :: (Symbol, Type)) :: (Symbol, NullityType) where

892+ FieldPG (field ::: hask) = field ::: NullPG hask

893+

894+{- | `NullPG` turns a Haskell type into a `NullityType`.

895+

896+>>> :kind! NullPG Double

897+NullPG Double :: NullityType

898+= 'NotNull 'PGfloat8

899+>>> :kind! NullPG (Maybe Double)

900+NullPG (Maybe Double) :: NullityType

901+= 'Null 'PGfloat8

902+-}

903+type family NullPG (hask :: Type) :: NullityType where

904+ NullPG (Maybe hask) = 'Null (PG hask)

905+ NullPG hask = 'NotNull (PG hask)

906+

907+{- | `TuplePG` turns a Haskell tuple type (including record types) into

908+the corresponding list of `NullityType`s.

909+

910+>>> :kind! TuplePG (Double, Maybe Char)

911+TuplePG (Double, Maybe Char) :: [NullityType]

912+= '[ 'NotNull 'PGfloat8, 'Null ('PGchar 1)]

913+-}

914+type family TuplePG (hask :: Type) :: [NullityType] where

915+ TuplePG hask = TupleOf (TupleCodeOf hask (Code hask))

916+

917+type family TupleOf (tuple :: [Type]) :: [NullityType] where

918+ TupleOf '[] = '[]

919+ TupleOf (hask ': tuple) = NullPG hask ': TupleOf tuple

920+

921+type family TupleCodeOf (hask :: Type) (code :: [[Type]]) :: [Type] where

922+ TupleCodeOf hask '[tuple] = tuple

923+ TupleCodeOf hask '[] =

924+ TypeError

925+ ( 'Text "The type `" ':<>: 'ShowType hask ':<>: 'Text "' is not a tuple type."

926+ ':$$: 'Text "It is a void type with no constructors."

927+ )

928+ TupleCodeOf hask (_ ': _ ': _) =

929+ TypeError

930+ ( 'Text "The type `" ':<>: 'ShowType hask ':<>: 'Text "' is not a tuple type."

931+ ':$$: 'Text "It is a sum type with more than one constructor."

932+ )

933+

934+-- | Calculates constructors of a datatype.

935+type family ConstructorsOf (datatype :: Type.DatatypeInfo)

936+ :: [Type.ConstructorInfo] where

937+ ConstructorsOf ('Type.ADT _module _datatype constructors) =

938+ constructors

939+ ConstructorsOf ('Type.Newtype _module _datatype constructor) =

940+ '[constructor]

941+

942+-- | Calculates the name of a nullary constructor, otherwise

943+-- generates a type error.

944+type family ConstructorNameOf (constructors :: Type.ConstructorInfo)

945+ :: Type.ConstructorName where

946+ ConstructorNameOf ('Type.Constructor name) = name

947+ ConstructorNameOf ('Type.Infix name _assoc _fix) = TypeError

948+ ('Text "ConstructorNameOf error: non-nullary constructor "

949+ ':<>: 'Text name)

950+ ConstructorNameOf ('Type.Record name _fields) = TypeError

951+ ('Text "ConstructorNameOf error: non-nullary constructor "

952+ ':<>: 'Text name)

953+

954+-- | Calculate the names of nullary constructors.

955+type family ConstructorNamesOf (constructors :: [Type.ConstructorInfo])

956+ :: [Type.ConstructorName] where

957+ ConstructorNamesOf '[] = '[]

958+ ConstructorNamesOf (constructor ': constructors) =

959+ ConstructorNameOf constructor ': ConstructorNamesOf constructors

squeal-postgresql/src/Squeal/PostgreSQL/Definition.hs+1012−15

@@ -11,15 +11,13 @@ Squeal data definition language.

11{-# LANGUAGE

12 AllowAmbiguousTypes

13 , ConstraintKinds

14− , DeriveAnyClass

15 , DeriveGeneric

14 , DeriveGeneric

16− , DerivingStrategies

17 , FlexibleContexts

15 , FlexibleContexts

18 , FlexibleInstances

16 , FlexibleInstances

19 , GADTs

17 , GADTs

18+ , GeneralizedNewtypeDeriving

20 , LambdaCase

19 , LambdaCase

21 , MultiParamTypeClasses

20 , MultiParamTypeClasses

22− , OverloadedLabels

23 , OverloadedStrings

21 , OverloadedStrings

24 , RankNTypes

22 , RankNTypes

25 , ScopedTypeVariables

23 , ScopedTypeVariables

@@ -27,31 +25,82 @@ Squeal data definition language.

27 , TypeInType

25 , TypeInType

28 , TypeOperators

26 , TypeOperators

29 , UndecidableSuperClasses

27 , UndecidableSuperClasses

30− , UndecidableInstances

31#-}

28#-}

33module Squeal.PostgreSQL.Definition

30module Squeal.PostgreSQL.Definition

34 ( -- * Definition

31 ( -- * Definition

35 Definition (..)

32 Definition (..)

36 , (>>>)

33 , (>>>)

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

38 ) where

86 ) where

40import Control.Category

88import Control.Category

41import Control.DeepSeq

89import Control.DeepSeq

42import Data.ByteString

90import Data.ByteString

43import Data.Monoid

91import Data.Monoid

92+import GHC.TypeLits

44import Prelude hiding ((.), id)

93import Prelude hiding ((.), id)

95+import qualified Generics.SOP as SOP

46import qualified GHC.Generics as GHC

96import qualified GHC.Generics as GHC

48−import Squeal.PostgreSQL.Manipulation

98+import Squeal.PostgreSQL.Binary

99+import Squeal.PostgreSQL.Expression

100+import Squeal.PostgreSQL.Query

49import Squeal.PostgreSQL.Render

101import Squeal.PostgreSQL.Render

50import Squeal.PostgreSQL.Schema

102import Squeal.PostgreSQL.Schema

103

52−-- $setup

53−-- >>> import Squeal.PostgreSQL

54−

55{-----------------------------------------

104{-----------------------------------------

56statements

105statements

57-----------------------------------------}

106-----------------------------------------}

@@ -73,10 +122,958 @@ instance Category Definition where

73 ddl1 . ddl0 = UnsafeDefinition $

122 ddl1 . ddl0 = UnsafeDefinition $

74 renderSQL ddl0 <> "\n" <> renderSQL ddl1

123 renderSQL ddl0 <> "\n" <> renderSQL ddl1

124

76−-- | A `Manipulation` without input or output can be run as a statement

125+{-----------------------------------------

77−-- along with other `Definition`s, by embedding it using `manipDefinition`.

126+CREATE statements

78−manipDefinition

127+-----------------------------------------}

79− :: Manipulation '[] schemas '[] '[]

128+

80− -- ^ no input or output

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

81 -> Definition schemas schemas

139 -> 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+2457−232

@@ -1,13 +1,14 @@

1{-|

2Module: Squeal.PostgreSQL.Expression

3Description: Squeal expressions

4−Copyright: (c) Eitan Chatav, 2019

4+Copyright: (c) Eitan Chatav, 2017

5Maintainer: eitan@morphism.tech

6Stability: experimental

8Squeal expressions are the atoms used to build statements.

9-}

11+{-# OPTIONS_GHC -fno-warn-redundant-constraints #-}

11{-# LANGUAGE

12{-# LANGUAGE

12 AllowAmbiguousTypes

13 AllowAmbiguousTypes

13 , ConstraintKinds

14 , ConstraintKinds

@@ -33,214 +34,343 @@ Squeal expressions are the atoms used to build statements.

33module Squeal.PostgreSQL.Expression

34module Squeal.PostgreSQL.Expression

34 ( -- * Expression

35 ( -- * Expression

35 Expression (..)

36 Expression (..)

36− , Expr

37+ , ClosedExpression

37− , type (-->)

38− , FunctionDB

39− , unsafeFunction

40− , function

41− , unsafeLeftOp

42− , leftOp

43− , unsafeRightOp

44− , rightOp

45 , Operator

38 , Operator

46− , OperatorDB

39+ , ComparisonOperator

40+ , HasParameter (parameter)

41+ , param

42+ -- ** Null

43+ , null_

44+ , notNull

45+ , coalesce

46+ , fromNull

47+ , isNull

48+ , isNotNull

49+ , matchNull

50+ , nullIf

51+ -- ** Collections

52+ , array

53+ , cardinality

54+ , index

55+ , row

56+ , field

57+ -- ** Functions

47 , unsafeBinaryOp

58 , unsafeBinaryOp

48− , binaryOp

59+ , unsafeUnaryOp

49− , FunctionVar

60+ , unsafeFunction

50− , unsafeFunctionVar

61+ , unsafeFunction2

51− , type (--->)

62+ , unsafeVariadicFunction

52− , FunctionNDB

63+ , atan2_

53− , unsafeFunctionN

64+ , cast

54− , functionN

65+ , quot_

55− , PGSubset (..)

66+ , rem_

56− , PGIntersect (..)

67+ , trunc

68+ , round_

69+ , ceiling_

70+ , greatest

71+ , least

72+ -- ** Conditions

73+ , true

74+ , false

75+ , not_

76+ , (.&&)

77+ , (.||)

78+ , Condition

79+ , caseWhenThenElse

80+ , ifThenElse

81+ , (.==)

82+ , (./=)

83+ , (.>=)

84+ , (.<)

85+ , (.<=)

86+ , (.>)

87+ , between

88+ , notBetween

89+ , betweenSymmetric

90+ , notBetweenSymmetric

91+ , isDistinctFrom

92+ , isNotDistinctFrom

93+ , isTrue

94+ , isNotTrue

95+ , isFalse

96+ , isNotFalse

97+ , isUnknown

98+ , isNotUnknown

99+ -- ** Time

100+ , currentDate

101+ , currentTime

102+ , currentTimestamp

103+ , localTime

104+ , localTimestamp

105+ , TimeOp (..)

106+ , makeDate

107+ , makeTime

108+ , makeTimestamp

109+ , makeTimestamptz

110+ -- ** Text

111+ , lower

112+ , upper

113+ , charLength

114+ , like

115+ , ilike

116+ -- ** Json

117+ -- *** Json and Jsonb operators

118+ , (.->)

119+ , (.->>)

120+ , (.#>)

121+ , (.#>>)

122+ -- *** Jsonb operators

123+ , (.@>)

124+ , (.<@)

125+ , (.?)

126+ , (.?|)

127+ , (.?&)

128+ , (.-.)

129+ , (#-.)

130+ -- *** Functions

131+ , jsonLit

132+ , jsonbLit

133+ , toJson

134+ , toJsonb

135+ , arrayToJson

136+ , rowToJson

137+ , jsonBuildArray

138+ , jsonbBuildArray

139+ , jsonBuildObject

140+ , jsonbBuildObject

141+ , jsonObject

142+ , jsonbObject

143+ , jsonZipObject

144+ , jsonbZipObject

145+ , jsonArrayLength

146+ , jsonbArrayLength

147+ , jsonExtractPath

148+ , jsonbExtractPath

149+ , jsonExtractPathAsText

150+ , jsonbExtractPathAsText

151+ , jsonTypeof

152+ , jsonbTypeof

153+ , jsonStripNulls

154+ , jsonbStripNulls

155+ , jsonbSet

156+ , jsonbInsert

157+ , jsonbPretty

158+ -- ** Text Search

159+ , (@@)

160+ , (.&)

161+ , (.|)

162+ , (.!)

163+ , (<->)

164+ -- ** Aggregation

165+ , Aggregate (..)

166+ , Distinction (..)

167+ , PGAvg

168+ -- * Window Functions

169+ , WindowDefinition (..)

170+ , partitionBy

171+ , WindowFunction (..)

172+ , rank

173+ , rowNumber

174+ , denseRank

175+ , percentRank

176+ , cumeDist

177+ , ntile

178+ , lag

179+ , lead

180+ , firstValue

181+ , lastValue

182+ , nthValue

183+ -- * Sorting

184+ , SortExpression (..)

185+ , OrderBy (..)

186+ -- * Types

187+ , TypeExpression (..)

188+ , PGTyped (..)

189+ , typedef

190+ , typetable

191+ , typeview

192+ , bool

193+ , int2

194+ , smallint

195+ , int4

196+ , int

197+ , integer

198+ , int8

199+ , bigint

200+ , numeric

201+ , float4

202+ , real

203+ , float8

204+ , doublePrecision

205+ , money

206+ , text

207+ , char

208+ , character

209+ , varchar

210+ , characterVarying

211+ , bytea

212+ , timestamp

213+ , timestampWithTimeZone

214+ , date

215+ , time

216+ , timeWithTimeZone

217+ , interval

218+ , uuid

219+ , inet

220+ , json

221+ , jsonb

222+ , vararray

223+ , fixarray

224+ , tsvector

225+ , tsquery

226+ , arrayToTSvector

227+ , tsvectorLength

228+ , numnode

229+ , plainToTSquery

230+ , phraseToTSquery

231+ , websearchToTSquery

232+ , queryTree

233+ , toTSquery

234+ , toTSvector

57 -- * Re-export

235 -- * Re-export

58 , (&)

236 , (&)

237+ , NP (..)

238+ , (:*:) (..)

59 , K (..)

239 , K (..)

60− , unK

61 ) where

240 ) where

241

63import Control.Category

242import Control.Category

64import Control.DeepSeq

243import Control.DeepSeq

65import Data.ByteString (ByteString)

244import Data.ByteString (ByteString)

245+import Data.ByteString.Lazy (toStrict)

66import Data.Function ((&))

246import Data.Function ((&))

67import Data.Semigroup hiding (All)

247import Data.Semigroup hiding (All)

248+import qualified Data.Aeson as JSON

68import Data.String

249import Data.String

250+import Data.Word

69import Generics.SOP hiding (All, from)

251import Generics.SOP hiding (All, from)

252+import GHC.Generics ((:*:) (..))

70import GHC.OverloadedLabels

253import GHC.OverloadedLabels

71import GHC.TypeLits

254import GHC.TypeLits

72import Numeric

255import Numeric

73import Prelude hiding (id, (.))

256import Prelude hiding (id, (.))

257

258+import qualified Data.ByteString as ByteString

75import qualified GHC.Generics as GHC

259import qualified GHC.Generics as GHC

260+import qualified Generics.SOP as SOP

261

77−import Squeal.PostgreSQL.Alias

78−import Squeal.PostgreSQL.List

79import Squeal.PostgreSQL.Render

262import Squeal.PostgreSQL.Render

80import Squeal.PostgreSQL.Schema

263import Squeal.PostgreSQL.Schema

264

82−-- $setup

83−-- >>> import Squeal.PostgreSQL

84−

85{-----------------------------------------

265{-----------------------------------------

86column expressions

266column expressions

87-----------------------------------------}

267-----------------------------------------}

268

89{- | `Expression`s are used in a variety of contexts,

269{- | `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,

270+such as in the target list of the `Squeal.PostgreSQL.Query.select` command,

92as new column values in `Squeal.PostgreSQL.Manipulation.insertRow` or

271as new column values in `Squeal.PostgreSQL.Manipulation.insertRow` or

93`Squeal.PostgreSQL.Manipulation.update`,

272`Squeal.PostgreSQL.Manipulation.update`,

94−or in search `Squeal.PostgreSQL.Logic.Condition`s in a number of commands.

273+or in search `Condition`s in a number of commands.

274

96The expression syntax allows the calculation of

275The expression syntax allows the calculation of

97values from primitive expression using arithmetic, logical,

276values from primitive expression using arithmetic, logical,

98and other operations.

277and 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`.

113-}

278-}

114newtype Expression

279newtype Expression

115 (outer :: FromType)

280 (outer :: FromType)

116− (commons :: FromType)

117 (grp :: Grouping)

281 (grp :: Grouping)

282+ (commons :: FromType)

118 (schemas :: SchemasType)

283 (schemas :: SchemasType)

119 (params :: [NullityType])

284 (params :: [NullityType])

120 (from :: FromType)

285 (from :: FromType)

121 (ty :: NullityType)

286 (ty :: NullityType)

122 = UnsafeExpression { renderExpression :: ByteString }

287 = UnsafeExpression { renderExpression :: ByteString }

123 deriving (GHC.Generic,Show,Eq,Ord,NFData)

288 deriving (GHC.Generic,Show,Eq,Ord,NFData)

124−instance RenderSQL (Expression outer commons grp schemas params from ty) where

289+instance RenderSQL (Expression outer grp commons schemas params from ty) where

125 renderSQL = renderExpression

290 renderSQL = renderExpression

126

291

127−-- | An `Expr` is a closed `Expression`.

292+type ClosedExpression ty

128−-- It is a F@RankNType@ but don't be scared.

293+ = forall outer grp commons schemas params from

129−-- Think of it as an expression which sees no

294+ . Expression outer grp commons schemas params from ty

130−-- namespaces, so you can't use parameters

295+

131−-- or alias references. It can be used as

296+type Operator ty1 ty2 ty3

132−-- a simple piece of more complex `Expression`s.

297+ = forall outer grp commons schemas params from

133−type Expr x

298+ . Expression outer grp commons schemas params from ty1

134− = forall outer commons grp schemas params from

299+ -> Expression outer grp commons schemas params from ty2

135− . Expression outer commons grp schemas params from x

300+ -> Expression outer grp commons schemas params from ty3

136− -- ^ cannot reference aliases

301+

137−

302+type ComparisonOperator ty1 ty2

138−-- | A @RankNType@ for binary operators.

303+ = Operator ty1 ty2 ('Null 'PGbool)

139−type Operator x1 x2 y

304+

140− = forall outer commons grp schemas params from

305+{- | A `HasParameter` constraint is used to indicate a value that is

141− . Expression outer commons grp schemas params from x1

306+supplied externally to a SQL statement.

142− -- ^ left input

307+`Squeal.PostgreSQL.PQ.manipulateParams`,

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

308+`Squeal.PostgreSQL.PQ.queryParams` and

144− -- ^ right input

309+`Squeal.PostgreSQL.PQ.traversePrepared` support specifying data values

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

310+separately from the SQL command string, in which case `param`s are used to

146− -- ^ output

311+refer to the out-of-line data values.

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−-}

312+-}

199−type FunctionVar x0 x1 y

313+class KnownNat n => HasParameter

200− = forall outer commons grp schemas params from

314+ (n :: Nat)

201− . [Expression outer commons grp schemas params from x0]

315+ (params :: [NullityType])

202− -- ^ inputs

316+ (ty :: NullityType)

203− -> Expression outer commons grp schemas params from x1

317+ | n params -> ty where

204− -- ^ must have at least 1 input

318+ -- | `parameter` takes a `Nat` using type application and a `TypeExpression`.

319+ --

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

320+ -- >>> let expr = parameter @1 int4 :: Expression outer grp '[] schemas '[ 'Null 'PGint4] from ('Null 'PGint4)

206− -- ^ output

321+ -- >>> printSQL expr

207−

322+ -- ($1 :: int4)

208−{- | >>> printSQL (unsafeFunctionVar "greatest" [true, null_] false)

323+ parameter

209−greatest(TRUE, NULL, FALSE)

324+ :: TypeExpression schemas ty

210−-}

325+ -> Expression outer grp commons schemas params from ty

211−unsafeFunctionVar :: ByteString -> FunctionVar x0 x1 y

212−unsafeFunctionVar fun xs x = UnsafeExpression $ fun <> parenthesized

326+ parameter ty = UnsafeExpression $ parenthesized $

213− (commaSeparated (renderSQL <$> xs) <> ", " <> renderSQL x)

327+ "$" <> renderNat @n <+> "::"

328+ <+> renderSQL ty

329+instance {-# OVERLAPPING #-} HasParameter 1 (ty1:tys) ty1

330+instance {-# OVERLAPPABLE #-} (KnownNat n, HasParameter (n-1) params ty)

331+ => HasParameter n (ty' : params) ty

332+

333+-- | `param` takes a `Nat` using type application and for basic types,

334+-- infers a `TypeExpression`.

335+--

336+-- >>> let expr = param @1 :: Expression outer grp commons schemas '[ 'Null 'PGint4] from ('Null 'PGint4)

337+-- >>> printSQL expr

338+-- ($1 :: int4)

339+param

340+ :: forall n outer commons schemas params from grp ty

341+ . (PGTyped schemas ty, HasParameter n params ty)

342+ => Expression outer grp commons schemas params from ty -- ^ param

343+param = parameter @n (pgtype @schemas)

214

344

215instance (HasUnique tab (Join outer from) row, Has col row ty)

345instance (HasUnique tab (Join outer from) row, Has col row ty)

216− => IsLabel col (Expression outer commons 'Ungrouped schemas params from ty) where

346+ => IsLabel col (Expression outer 'Ungrouped commons schemas params from ty) where

217 fromLabel = UnsafeExpression $ renderSQL (Alias @col)

347 fromLabel = UnsafeExpression $ renderSQL (Alias @col)

218instance (HasUnique tab (Join outer from) row, Has col row ty, tys ~ '[ty])

348instance (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

349+ => IsLabel col (NP (Expression outer 'Ungrouped commons schemas params from) tys) where

220 fromLabel = fromLabel @col :* Nil

350 fromLabel = fromLabel @col :* Nil

221instance (HasUnique tab (Join outer from) row, Has col row ty, column ~ (col ::: ty))

351instance (HasUnique tab (Join outer from) row, Has col row ty, column ~ (col ::: ty))

222 => IsLabel col

352 => IsLabel col

223− (Aliased (Expression outer commons 'Ungrouped schemas params from) column) where

353+ (Aliased (Expression outer 'Ungrouped commons schemas params from) column) where

224 fromLabel = fromLabel @col `As` Alias

354 fromLabel = fromLabel @col `As` Alias

225instance (HasUnique tab (Join outer from) row, Has col row ty, columns ~ '[col ::: ty])

355instance (HasUnique tab (Join outer from) row, Has col row ty, columns ~ '[col ::: ty])

226 => IsLabel col

356 => IsLabel col

227− (NP (Aliased (Expression outer commons 'Ungrouped schemas params from)) columns) where

357+ (NP (Aliased (Expression outer 'Ungrouped commons schemas params from)) columns) where

228 fromLabel = fromLabel @col :* Nil

358 fromLabel = fromLabel @col :* Nil

229

359

230instance (Has tab (Join outer from) row, Has col row ty)

360instance (Has tab (Join outer from) row, Has col row ty)

231− => IsQualified tab col (Expression outer commons 'Ungrouped schemas params from ty) where

361+ => IsQualified tab col (Expression outer 'Ungrouped commons schemas params from ty) where

232 tab ! col = UnsafeExpression $

362 tab ! col = UnsafeExpression $

233 renderSQL tab <> "." <> renderSQL col

363 renderSQL tab <> "." <> renderSQL col

234instance (Has tab (Join outer from) row, Has col row ty, tys ~ '[ty])

364instance (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

365+ => IsQualified tab col (NP (Expression outer 'Ungrouped commons schemas params from) tys) where

236 tab ! col = tab ! col :* Nil

366 tab ! col = tab ! col :* Nil

237instance (Has tab (Join outer from) row, Has col row ty, column ~ (col ::: ty))

367instance (Has tab (Join outer from) row, Has col row ty, column ~ (col ::: ty))

238 => IsQualified tab col

368 => IsQualified tab col

239− (Aliased (Expression outer commons 'Ungrouped schemas params from) column) where

369+ (Aliased (Expression outer 'Ungrouped commons schemas params from) column) where

240 tab ! col = tab ! col `As` col

370 tab ! col = tab ! col `As` col

241instance (Has tab (Join outer from) row, Has col row ty, columns ~ '[col ::: ty])

371instance (Has tab (Join outer from) row, Has col row ty, columns ~ '[col ::: ty])

242 => IsQualified tab col

372 => IsQualified tab col

243− (NP (Aliased (Expression outer commons 'Ungrouped schemas params from)) columns) where

373+ (NP (Aliased (Expression outer 'Ungrouped commons schemas params from)) columns) where

244 tab ! col = tab ! col :* Nil

374 tab ! col = tab ! col :* Nil

245

375

246instance

376instance

@@ -248,7 +378,7 @@ instance

248 , Has col row ty

378 , Has col row ty

249 , GroupedBy tab col bys

379 , GroupedBy tab col bys

250 ) => IsLabel col

380 ) => IsLabel col

251− (Expression outer commons ('Grouped bys) schemas params from ty) where

381+ (Expression outer ('Grouped bys) commons schemas params from ty) where

252 fromLabel = UnsafeExpression $ renderSQL (Alias @col)

382 fromLabel = UnsafeExpression $ renderSQL (Alias @col)

253instance

383instance

254 ( HasUnique tab (Join outer from) row

384 ( HasUnique tab (Join outer from) row

@@ -256,7 +386,7 @@ instance

256 , GroupedBy tab col bys

386 , GroupedBy tab col bys

257 , tys ~ '[ty]

387 , tys ~ '[ty]

258 ) => IsLabel col

388 ) => IsLabel col

259− (NP (Expression outer commons ('Grouped bys) schemas params from) tys) where

389+ (NP (Expression outer ('Grouped bys) commons schemas params from) tys) where

260 fromLabel = fromLabel @col :* Nil

390 fromLabel = fromLabel @col :* Nil

261instance

391instance

262 ( HasUnique tab (Join outer from) row

392 ( HasUnique tab (Join outer from) row

@@ -264,7 +394,7 @@ instance

264 , GroupedBy tab col bys

394 , GroupedBy tab col bys

265 , column ~ (col ::: ty)

395 , column ~ (col ::: ty)

266 ) => IsLabel col

396 ) => IsLabel col

267− (Aliased (Expression outer commons ('Grouped bys) schemas params from) column) where

397+ (Aliased (Expression outer ('Grouped bys) commons schemas params from) column) where

268 fromLabel = fromLabel @col `As` Alias

398 fromLabel = fromLabel @col `As` Alias

269instance

399instance

270 ( HasUnique tab (Join outer from) row

400 ( HasUnique tab (Join outer from) row

@@ -272,7 +402,7 @@ instance

272 , GroupedBy tab col bys

402 , GroupedBy tab col bys

273 , columns ~ '[col ::: ty]

403 , columns ~ '[col ::: ty]

274 ) => IsLabel col

404 ) => IsLabel col

275− (NP (Aliased (Expression outer commons ('Grouped bys) schemas params from)) columns) where

405+ (NP (Aliased (Expression outer ('Grouped bys) commons schemas params from)) columns) where

276 fromLabel = fromLabel @col :* Nil

406 fromLabel = fromLabel @col :* Nil

277

407

278instance

408instance

@@ -280,7 +410,7 @@ instance

280 , Has col row ty

410 , Has col row ty

281 , GroupedBy tab col bys

411 , GroupedBy tab col bys

282 ) => IsQualified tab col

412 ) => IsQualified tab col

283− (Expression outer commons ('Grouped bys) schemas params from ty) where

413+ (Expression outer ('Grouped bys) commons schemas params from ty) where

284 tab ! col = UnsafeExpression $

414 tab ! col = UnsafeExpression $

285 renderSQL tab <> "." <> renderSQL col

415 renderSQL tab <> "." <> renderSQL col

286instance

416instance

@@ -289,7 +419,7 @@ instance

289 , GroupedBy tab col bys

419 , GroupedBy tab col bys

290 , tys ~ '[ty]

420 , tys ~ '[ty]

291 ) => IsQualified tab col

421 ) => IsQualified tab col

292− (NP (Expression outer commons ('Grouped bys) schemas params from) tys) where

422+ (NP (Expression outer ('Grouped bys) commons schemas params from) tys) where

293 tab ! col = tab ! col :* Nil

423 tab ! col = tab ! col :* Nil

294instance

424instance

295 ( Has tab (Join outer from) row

425 ( Has tab (Join outer from) row

@@ -297,7 +427,7 @@ instance

297 , GroupedBy tab col bys

427 , GroupedBy tab col bys

298 , column ~ (col ::: ty)

428 , column ~ (col ::: ty)

299 ) => IsQualified tab col

429 ) => IsQualified tab col

300− (Aliased (Expression outer commons ('Grouped bys) schemas params from) column) where

430+ (Aliased (Expression outer ('Grouped bys) commons schemas params from) column) where

301 tab ! col = tab ! col `As` col

431 tab ! col = tab ! col `As` col

302instance

432instance

303 ( Has tab (Join outer from) row

433 ( Has tab (Join outer from) row

@@ -305,78 +435,253 @@ instance

305 , GroupedBy tab col bys

435 , GroupedBy tab col bys

306 , columns ~ '[col ::: ty]

436 , columns ~ '[col ::: ty]

307 ) => IsQualified tab col

437 ) => IsQualified tab col

308− (NP (Aliased (Expression outer commons ('Grouped bys) schemas params from)) columns) where

438+ (NP (Aliased (Expression outer ('Grouped bys) commons schemas params from)) columns) where

309 tab ! col = tab ! col :* Nil

439 tab ! col = tab ! col :* Nil

310

440

441+-- | analagous to `Nothing`

442+--

443+-- >>> printSQL null_

444+-- NULL

445+null_ :: Expression outer grp commons schemas params from ('Null ty)

446+null_ = UnsafeExpression "NULL"

447+

448+-- | analagous to `Just`

449+--

450+-- >>> printSQL $ notNull true

451+-- TRUE

452+notNull

453+ :: Expression outer grp commons schemas params from ('NotNull ty)

454+ -> Expression outer grp commons schemas params from ('Null ty)

455+notNull = UnsafeExpression . renderSQL

456+

457+-- | return the leftmost value which is not NULL

458+--

459+-- >>> printSQL $ coalesce [null_, true] false

460+-- COALESCE(NULL, TRUE, FALSE)

461+coalesce

462+ :: [Expression outer grp commons schemas params from ('Null ty)]

463+ -- ^ @NULL@s may be present

464+ -> Expression outer grp commons schemas params from ('NotNull ty)

465+ -- ^ @NULL@ is absent

466+ -> Expression outer grp commons schemas params from ('NotNull ty)

467+coalesce nullxs notNullx = UnsafeExpression $

468+ "COALESCE" <> parenthesized (commaSeparated

469+ ((renderSQL <$> nullxs) <> [renderSQL notNullx]))

470+

471+-- | analagous to `Data.Maybe.fromMaybe` using @COALESCE@

472+--

473+-- >>> printSQL $ fromNull true null_

474+-- COALESCE(NULL, TRUE)

475+fromNull

476+ :: Expression outer grp commons schemas params from ('NotNull ty)

477+ -- ^ what to convert @NULL@ to

478+ -> Expression outer grp commons schemas params from ('Null ty)

479+ -> Expression outer grp commons schemas params from ('NotNull ty)

480+fromNull notNullx nullx = coalesce [nullx] notNullx

481+

482+-- | >>> printSQL $ null_ & isNull

483+-- NULL IS NULL

484+isNull

485+ :: Expression outer grp commons schemas params from ('Null ty)

486+ -- ^ possibly @NULL@

487+ -> Condition outer grp commons schemas params from

488+isNull x = UnsafeExpression $ renderSQL x <+> "IS NULL"

489+

490+-- | >>> printSQL $ null_ & isNotNull

491+-- NULL IS NOT NULL

492+isNotNull

493+ :: Expression outer grp commons schemas params from ('Null ty)

494+ -- ^ possibly @NULL@

495+ -> Condition outer grp commons schemas params from

496+isNotNull x = UnsafeExpression $ renderSQL x <+> "IS NOT NULL"

497+

498+-- | analagous to `maybe` using @IS NULL@

499+--

500+-- >>> printSQL $ matchNull true not_ null_

501+-- CASE WHEN NULL IS NULL THEN TRUE ELSE (NOT NULL) END

502+matchNull

503+ :: Expression outer grp commons schemas params from (nullty)

504+ -- ^ what to convert @NULL@ to

505+ -> ( Expression outer grp commons schemas params from ('NotNull ty)

506+ -> Expression outer grp commons schemas params from (nullty) )

507+ -- ^ function to perform when @NULL@ is absent

508+ -> Expression outer grp commons schemas params from ('Null ty)

509+ -> Expression outer grp commons schemas params from (nullty)

510+matchNull y f x = ifThenElse (isNull x) y

511+ (f (UnsafeExpression (renderSQL x)))

512+

513+{-| right inverse to `fromNull`, if its arguments are equal then

514+`nullIf` gives @NULL@.

515+

516+>>> :set -XTypeApplications -XDataKinds

517+>>> let expr = nullIf false (param @1) :: Expression outer grp commons schemas '[ 'NotNull 'PGbool] from ('Null 'PGbool)

518+>>> printSQL expr

519+NULL IF (FALSE, ($1 :: bool))

520+-}

521+nullIf

522+ :: Expression outer grp commons schemas params from ('NotNull ty)

523+ -- ^ @NULL@ is absent

524+ -> Expression outer grp commons schemas params from ('NotNull ty)

525+ -- ^ @NULL@ is absent

526+ -> Expression outer grp commons schemas params from ('Null ty)

527+nullIf x y = UnsafeExpression $ "NULL IF" <+> parenthesized

528+ (renderSQL x <> ", " <> renderSQL y)

529+

530+-- | >>> printSQL $ array [null_, false, true]

531+-- ARRAY[NULL, FALSE, TRUE]

532+array

533+ :: [Expression outer grp commons schemas params from ty]

534+ -- ^ array elements

535+ -> Expression outer grp commons schemas params from (nullity ('PGvararray ty))

536+array xs = UnsafeExpression $

537+ "ARRAY[" <> commaSeparated (renderSQL <$> xs) <> "]"

538+

539+-- | >>> printSQL $ cardinality (array [null_, false, true])

540+-- cardinality(ARRAY[NULL, FALSE, TRUE])

541+cardinality

542+ :: Expression outer grp commons schemas params from (nullity ('PGvararray ty))

543+ -> Expression outer grp commons schemas params from (nullity 'PGint8)

544+cardinality = unsafeFunction "cardinality"

545+

546+-- | >>> printSQL $ array [null_, false, true] & index 2

547+-- (ARRAY[NULL, FALSE, TRUE])[2]

548+index

549+ :: Word64 -- ^ index

550+ -> Expression outer grp commons schemas params from (nullity ('PGvararray ty)) -- ^ array

551+ -> Expression outer grp commons schemas params from (NullifyType ty)

552+index n expr = UnsafeExpression $

553+ parenthesized (renderSQL expr) <> "[" <> fromString (show n) <> "]"

554+

311instance (KnownSymbol label, label `In` labels) => IsPGlabel label

555instance (KnownSymbol label, label `In` labels) => IsPGlabel label

312− (Expression outer commons grp schemas params from (null ('PGenum labels))) where

556+ (Expression outer grp commons schemas params from (nullity ('PGenum labels))) where

313 label = UnsafeExpression $ renderSQL (PGlabel @label)

557 label = UnsafeExpression $ renderSQL (PGlabel @label)

314

558

559+-- | A row constructor is an expression that builds a row value

560+-- (also called a composite value) using values for its member fields.

561+--

562+-- >>> :{

563+-- type Complex = 'PGcomposite

564+-- '[ "real" ::: 'NotNull 'PGfloat8

565+-- , "imaginary" ::: 'NotNull 'PGfloat8 ]

566+-- :}

567+--

568+-- >>> let i = row (0 `as` #real :* 1 `as` #imaginary) :: Expression outer grp commons schemas params from ('NotNull Complex)

569+-- >>> printSQL i

570+-- ROW(0, 1)

571+row

572+ :: SListI row

573+ => NP (Aliased (Expression outer grp commons schemas params from)) row

574+ -- ^ zero or more expressions for the row field values

575+ -> Expression outer grp commons schemas params from (nullity ('PGcomposite row))

576+row exprs = UnsafeExpression $ "ROW" <> parenthesized

577+ (renderCommaSeparated (\ (expr `As` _) -> renderSQL expr) exprs)

578+

579+-- | >>> :{

580+-- type Complex = 'PGcomposite

581+-- '[ "real" ::: 'NotNull 'PGfloat8

582+-- , "imaginary" ::: 'NotNull 'PGfloat8 ]

583+-- type Schema = '["complex" ::: 'Typedef Complex]

584+-- :}

585+--

586+-- >>> let i = row (0 `as` #real :* 1 `as` #imaginary) :: Expression outer grp '[] (Public Schema) from params ('NotNull Complex)

587+-- >>> printSQL $ i & field #complex #imaginary

588+-- (ROW(0, 1)::"complex")."imaginary"

589+field

590+ :: ( Has sch schemas schema

591+ , Has tydef schema ('Typedef ('PGcomposite row))

592+ , Has field row ty)

593+ => QualifiedAlias sch tydef -- ^ row type

594+ -> Alias field -- ^ field name

595+ -> Expression outer grp commons schemas params from ('NotNull ('PGcomposite row))

596+ -> Expression outer grp commons schemas params from ty

597+field td fld expr = UnsafeExpression $

598+ parenthesized (renderSQL expr <> "::" <> renderSQL td)

599+ <> "." <> renderSQL fld

600+

601+instance Semigroup

602+ (Expression outer grp commons schemas params from (nullity ('PGvararray ty))) where

603+ (<>) = unsafeBinaryOp "||"

604+

605+instance Monoid

606+ (Expression outer grp commons schemas params from (nullity ('PGvararray ty))) where

607+ mempty = array []

608+ mappend = (<>)

609+

610+-- | >>> let expr = greatest currentTimestamp [param @1] :: Expression outer grp commons schemas '[ 'NotNull 'PGtimestamptz] from ('NotNull 'PGtimestamptz)

611+-- >>> printSQL expr

612+-- GREATEST(CURRENT_TIMESTAMP, ($1 :: timestamp with time zone))

613+greatest

614+ :: Expression outer grp commons schemas params from (nullty)

615+ -- ^ needs at least 1 argument

616+ -> [Expression outer grp commons schemas params from (nullty)]

617+ -- ^ or more

618+ -> Expression outer grp commons schemas params from (nullty)

619+greatest x xs = UnsafeExpression $ "GREATEST("

620+ <> commaSeparated (renderSQL <$> (x:xs)) <> ")"

621+

622+-- | >>> printSQL $ least currentTimestamp [null_]

623+-- LEAST(CURRENT_TIMESTAMP, NULL)

624+least

625+ :: Expression outer grp commons schemas params from (nullty)

626+ -- ^ needs at least 1 argument

627+ -> [Expression outer grp commons schemas params from (nullty)]

628+ -- ^ or more

629+ -> Expression outer grp commons schemas params from (nullty)

630+least x xs = UnsafeExpression $ "LEAST("

631+ <> commaSeparated (renderSQL <$> (x:xs)) <> ")"

632+

315-- | >>> printSQL $ unsafeBinaryOp "OR" true false

633-- | >>> printSQL $ unsafeBinaryOp "OR" true false

316-- (TRUE OR FALSE)

634-- (TRUE OR FALSE)

317−unsafeBinaryOp :: ByteString -> Operator ty0 ty1 ty2

635+unsafeBinaryOp

636+ :: ByteString

637+ -- ^ operator

638+ -> Expression outer grp commons schemas params from (ty0)

639+ -> Expression outer grp commons schemas params from (ty1)

640+ -> Expression outer grp commons schemas params from (ty2)

318unsafeBinaryOp op x y = UnsafeExpression $ parenthesized $

641unsafeBinaryOp op x y = UnsafeExpression $ parenthesized $

319 renderSQL x <+> op <+> renderSQL y

642 renderSQL x <+> op <+> renderSQL y

320

643

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

644+-- | >>> printSQL $ unsafeUnaryOp "NOT" true

329-- (NOT TRUE)

645-- (NOT TRUE)

646+unsafeUnaryOp

330−unsafeLeftOp :: ByteString -> x --> y

647+ :: ByteString

331−unsafeLeftOp op x = UnsafeExpression $ parenthesized $ op <+> renderSQL x

648+ -- ^ operator

332−

649+ -> Expression outer grp commons schemas params from (ty0)

333−leftOp

650+ -> Expression outer grp commons schemas params from (ty1)

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

651+unsafeUnaryOp op x = UnsafeExpression $ parenthesized $

344−

652+ op <+> renderSQL x

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

351

653

352-- | >>> printSQL $ unsafeFunction "f" true

654-- | >>> printSQL $ unsafeFunction "f" true

353-- f(TRUE)

655-- f(TRUE)

354−unsafeFunction :: ByteString -> x --> y

656+unsafeFunction

657+ :: ByteString

658+ -- ^ function

659+ -> Expression outer grp commons schemas params from xty

660+ -> Expression outer grp commons schemas params from yty

355unsafeFunction fun x = UnsafeExpression $

661unsafeFunction fun x = UnsafeExpression $

356 fun <> parenthesized (renderSQL x)

662 fun <> parenthesized (renderSQL x)

357

663

358−function

664+unsafeFunction2

359− :: (Has sch schemas schema, Has fun schema ('Function ('[x] :=> 'Returns y)))

665+ :: ByteString

360− => QualifiedAlias sch fun

666+ -- ^ function

361− -> FunctionDB schemas x y

667+ -> Expression outer grp commons schemas params from ty1

362−function = unsafeFunction . renderSQL

668+ -> Expression outer grp commons schemas params from ty2

669+ -> Expression outer grp commons schemas params from ty

670+unsafeFunction2 fun x1 x2 = UnsafeExpression $

671+ fun <> parenthesized (commaSeparated [renderSQL x1, renderSQL x2])

363

672

364−-- | >>> printSQL $ unsafeFunctionN "f" (currentTime :* localTimestamp :* false *: literal 'a')

673+-- | Helper for defining variadic functions.

365−-- f(CURRENT_TIME, LOCALTIMESTAMP, FALSE, E'a')

674+unsafeVariadicFunction

675+ :: SListI elems

366−unsafeFunctionN :: SListI xs => ByteString -> xs ---> y

676+ => ByteString

677+ -- ^ function

678+ -> NP (Expression outer grp commons schemas params from) elems

679+ -> Expression outer grp commons schemas params from ret

367−unsafeFunctionN fun xs = UnsafeExpression $

680+unsafeVariadicFunction fun x = UnsafeExpression $

368− fun <> parenthesized (renderCommaSeparated renderSQL xs)

681+ fun <> parenthesized (commaSeparated (hcollapse (hmap (K . renderSQL) x)))

369−

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

377

682

378instance ty `In` PGNum

683instance ty `In` PGNum

379− => Num (Expression outer commons grp schemas params from (null ty)) where

684+ => Num (Expression outer grp commons schemas params from (nullity ty)) where

380 (+) = unsafeBinaryOp "+"

685 (+) = unsafeBinaryOp "+"

381 (-) = unsafeBinaryOp "-"

686 (-) = unsafeBinaryOp "-"

382 (*) = unsafeBinaryOp "*"

687 (*) = unsafeBinaryOp "*"

@@ -388,7 +693,7 @@ instance ty `In` PGNum

388 . show

693 . show

389

694

390instance (ty `In` PGNum, ty `In` PGFloating) => Fractional

695instance (ty `In` PGNum, ty `In` PGFloating) => Fractional

391− (Expression outer commons grp schemas params from (null ty)) where

696+ (Expression outer grp commons schemas params from (nullity ty)) where

392 (/) = unsafeBinaryOp "/"

697 (/) = unsafeBinaryOp "/"

393 fromRational

698 fromRational

394 = UnsafeExpression

699 = UnsafeExpression

@@ -398,7 +703,7 @@ instance (ty `In` PGNum, ty `In` PGFloating) => Fractional

398 . fromRat @Double

703 . fromRat @Double

399

704

400instance (ty `In` PGNum, ty `In` PGFloating) => Floating

705instance (ty `In` PGNum, ty `In` PGFloating) => Floating

401− (Expression outer commons grp schemas params from (null ty)) where

706+ (Expression outer grp commons schemas params from (nullity ty)) where

402 pi = UnsafeExpression "pi()"

707 pi = UnsafeExpression "pi()"

403 exp = unsafeFunction "exp"

708 exp = unsafeFunction "exp"

404 log = unsafeFunction "ln"

709 log = unsafeFunction "ln"

@@ -419,54 +724,1974 @@ instance (ty `In` PGNum, ty `In` PGFloating) => Floating

419 acosh x = log (x + sqrt (x*x - 1))

724 acosh x = log (x + sqrt (x*x - 1))

420 atanh x = log ((1 + x) / (1 - x)) / 2

725 atanh x = log ((1 + x) / (1 - x)) / 2

421

726

422−-- | Contained by operators

727+-- | >>> :{

423−class PGSubset ty where

728+-- let

424− (@>) :: Operator (null0 ty) (null1 ty) ('Null 'PGbool)

729+-- expression :: Expression outer grp commons schemas params from (nullity 'PGfloat4)

425− (@>) = unsafeBinaryOp "@>"

730+-- expression = atan2_ pi 2

426− (<@) :: Operator (null0 ty) (null1 ty) ('Null 'PGbool)

731+-- in printSQL expression

427− (<@) = unsafeBinaryOp "<@"

732+-- :}

428−instance PGSubset 'PGjsonb

733+-- atan2(pi(), 2)

429−instance PGSubset 'PGtsquery

734+atan2_

430−instance PGSubset ('PGvararray ty)

735+ :: float `In` PGFloating

431−instance PGSubset ('PGrange ty)

736+ => Expression outer grp commons schemas params from (nullity float)

432−

737+ -- ^ numerator

433−class PGIntersect ty where

738+ -> Expression outer grp commons schemas params from (nullity float)

434− (@&&) :: Operator (null0 ty) (null1 ty) ('Null 'PGbool)

739+ -- ^ denominator

435− (@&&) = unsafeBinaryOp "&&"

740+ -> Expression outer grp commons schemas params from (nullity float)

436−instance PGIntersect ('PGvararray ty)

741+atan2_ y x = UnsafeExpression $

437−instance PGIntersect ('PGrange ty)

742+ "atan2(" <> renderSQL y <> ", " <> renderSQL x <> ")"

743+

744+-- When a `cast` is applied to an `Expression` of a known type, it

745+-- represents a run-time type conversion. The cast will succeed only if a

746+-- suitable type conversion operation has been defined.

747+--

748+-- | >>> printSQL $ true & cast int4

749+-- (TRUE :: int4)

750+cast

751+ :: TypeExpression schemas ty1

752+ -- ^ type to cast as

753+ -> Expression outer grp commons schemas params from ty0

754+ -- ^ value to convert

755+ -> Expression outer grp commons schemas params from ty1

756+cast ty x = UnsafeExpression $ parenthesized $

757+ renderSQL x <+> "::" <+> renderSQL ty

758+

759+-- | integer division, truncates the result

760+--

761+-- >>> :{

762+-- let

763+-- expression :: Expression outer grp commons schemas params from (nullity 'PGint2)

764+-- expression = 5 `quot_` 2

765+-- in printSQL expression

766+-- :}

767+-- (5 / 2)

768+quot_

769+ :: int `In` PGIntegral

770+ => Expression outer grp commons schemas params from (nullity int)

771+ -- ^ numerator

772+ -> Expression outer grp commons schemas params from (nullity int)

773+ -- ^ denominator

774+ -> Expression outer grp commons schemas params from (nullity int)

775+quot_ = unsafeBinaryOp "/"

776+

777+-- | remainder upon integer division

778+--

779+-- >>> :{

780+-- let

781+-- expression :: Expression outer grp commons schemas params from (nullity 'PGint2)

782+-- expression = 5 `rem_` 2

783+-- in printSQL expression

784+-- :}

785+-- (5 % 2)

786+rem_

787+ :: int `In` PGIntegral

788+ => Expression outer grp commons schemas params from (nullity int)

789+ -- ^ numerator

790+ -> Expression outer grp commons schemas params from (nullity int)

791+ -- ^ denominator

792+ -> Expression outer grp commons schemas params from (nullity int)

793+rem_ = unsafeBinaryOp "%"

794+

795+-- | >>> :{

796+-- let

797+-- expression :: Expression outer grp commons schemas params from (nullity 'PGfloat4)

798+-- expression = trunc pi

799+-- in printSQL expression

800+-- :}

801+-- trunc(pi())

802+trunc

803+ :: frac `In` PGFloating

804+ => Expression outer grp commons schemas params from (nullity frac)

805+ -- ^ fractional number

806+ -> Expression outer grp commons schemas params from (nullity frac)

807+trunc = unsafeFunction "trunc"

808+

809+-- | >>> :{

810+-- let

811+-- expression :: Expression outer grp commons schemas params from (nullity 'PGfloat4)

812+-- expression = round_ pi

813+-- in printSQL expression

814+-- :}

815+-- round(pi())

816+round_

817+ :: frac `In` PGFloating

818+ => Expression outer grp commons schemas params from (nullity frac)

819+ -- ^ fractional number

820+ -> Expression outer grp commons schemas params from (nullity frac)

821+round_ = unsafeFunction "round"

822+

823+-- | >>> :{

824+-- let

825+-- expression :: Expression outer grp commons schemas params from (nullity 'PGfloat4)

826+-- expression = ceiling_ pi

827+-- in printSQL expression

828+-- :}

829+-- ceiling(pi())

830+ceiling_

831+ :: frac `In` PGFloating

832+ => Expression outer grp commons schemas params from (nullity frac)

833+ -- ^ fractional number

834+ -> Expression outer grp commons schemas params from (nullity frac)

835+ceiling_ = unsafeFunction "ceiling"

836+

837+-- | A `Condition` is an `Expression`, which can evaluate

838+-- to `true`, `false` or `null_`. This is because SQL uses

839+-- a three valued logic.

840+type Condition outer grp commons schemas params from =

841+ Expression outer grp commons schemas params from ('Null 'PGbool)

842+

843+-- | >>> printSQL true

844+-- TRUE

845+true :: Expression outer grp commons schemas params from (nullity 'PGbool)

846+true = UnsafeExpression "TRUE"

847+

848+-- | >>> printSQL false

849+-- FALSE

850+false :: Expression outer grp commons schemas params from (nullity 'PGbool)

851+false = UnsafeExpression "FALSE"

852+

853+-- | >>> printSQL $ not_ true

854+-- (NOT TRUE)

855+not_

856+ :: Expression outer grp commons schemas params from (nullity 'PGbool)

857+ -> Expression outer grp commons schemas params from (nullity 'PGbool)

858+not_ = unsafeUnaryOp "NOT"

859+

860+-- | >>> printSQL $ true .&& false

861+-- (TRUE AND FALSE)

862+(.&&)

863+ :: Expression outer grp commons schemas params from (nullity 'PGbool)

864+ -> Expression outer grp commons schemas params from (nullity 'PGbool)

865+ -> Expression outer grp commons schemas params from (nullity 'PGbool)

866+infixr 3 .&&

867+(.&&) = unsafeBinaryOp "AND"

868+

869+-- | >>> printSQL $ true .|| false

870+-- (TRUE OR FALSE)

871+(.||)

872+ :: Expression outer grp commons schemas params from (nullity 'PGbool)

873+ -> Expression outer grp commons schemas params from (nullity 'PGbool)

874+ -> Expression outer grp commons schemas params from (nullity 'PGbool)

875+infixr 2 .||

876+(.||) = unsafeBinaryOp "OR"

877+

878+-- | >>> :{

879+-- let

880+-- expression :: Expression outer grp commons schemas params from (nullity 'PGint2)

881+-- expression = caseWhenThenElse [(true, 1), (false, 2)] 3

882+-- in printSQL expression

883+-- :}

884+-- CASE WHEN TRUE THEN 1 WHEN FALSE THEN 2 ELSE 3 END

885+caseWhenThenElse

886+ :: [ ( Condition outer grp commons schemas params from

887+ , Expression outer grp commons schemas params from ty

888+ ) ]

889+ -- ^ whens and thens

890+ -> Expression outer grp commons schemas params from ty

891+ -- ^ else

892+ -> Expression outer grp commons schemas params from ty

893+caseWhenThenElse whenThens else_ = UnsafeExpression $ mconcat

894+ [ "CASE"

895+ , mconcat

896+ [ mconcat

897+ [ " WHEN ", renderSQL when_

898+ , " THEN ", renderSQL then_

899+ ]

900+ | (when_,then_) <- whenThens

901+ ]

902+ , " ELSE ", renderSQL else_

903+ , " END"

904+ ]

905+

906+-- | >>> :{

907+-- let

908+-- expression :: Expression outer grp commons schemas params from (nullity 'PGint2)

909+-- expression = ifThenElse true 1 0

910+-- in printSQL expression

911+-- :}

912+-- CASE WHEN TRUE THEN 1 ELSE 0 END

913+ifThenElse

914+ :: Condition outer grp commons schemas params from

915+ -> Expression outer grp commons schemas params from ty -- ^ then

916+ -> Expression outer grp commons schemas params from ty -- ^ else

917+ -> Expression outer grp commons schemas params from ty

918+ifThenElse if_ then_ else_ = caseWhenThenElse [(if_,then_)] else_

919+

920+-- | Comparison operations like `.==`, `./=`, `.>`, `.>=`, `.<` and `.<=`

921+-- will produce @NULL@s if one of their arguments is @NULL@.

922+--

923+-- >>> printSQL $ true .== null_

924+-- (TRUE = NULL)

925+(.==)

926+ :: Expression outer grp commons schemas params from (nullity0 ty) -- ^ lhs

927+ -> Expression outer grp commons schemas params from (nullity1 ty) -- ^ rhs

928+ -> Condition outer grp commons schemas params from

929+(.==) = unsafeBinaryOp "="

930+infix 4 .==

931+

932+-- | >>> printSQL $ true ./= null_

933+-- (TRUE <> NULL)

934+(./=)

935+ :: Expression outer grp commons schemas params from (nullity0 ty) -- ^ lhs

936+ -> Expression outer grp commons schemas params from (nullity1 ty) -- ^ rhs

937+ -> Condition outer grp commons schemas params from

938+(./=) = unsafeBinaryOp "<>"

939+infix 4 ./=

940+

941+-- | >>> printSQL $ true .>= null_

942+-- (TRUE >= NULL)

943+(.>=)

944+ :: Expression outer grp commons schemas params from (nullity0 ty) -- ^ lhs

945+ -> Expression outer grp commons schemas params from (nullity1 ty) -- ^ rhs

946+ -> Condition outer grp commons schemas params from

947+(.>=) = unsafeBinaryOp ">="

948+infix 4 .>=

949+

950+-- | >>> printSQL $ true .< null_

951+-- (TRUE < NULL)

952+(.<)

953+ :: Expression outer grp commons schemas params from (nullity0 ty) -- ^ lhs

954+ -> Expression outer grp commons schemas params from (nullity1 ty) -- ^ rhs

955+ -> Condition outer grp commons schemas params from

956+(.<) = unsafeBinaryOp "<"

957+infix 4 .<

958+

959+-- | >>> printSQL $ true .<= null_

960+-- (TRUE <= NULL)

961+(.<=)

962+ :: Expression outer grp commons schemas params from (nullity0 ty) -- ^ lhs

963+ -> Expression outer grp commons schemas params from (nullity1 ty) -- ^ rhs

964+ -> Condition outer grp commons schemas params from

965+(.<=) = unsafeBinaryOp "<="

966+infix 4 .<=

967+

968+-- | >>> printSQL $ true .> null_

969+-- (TRUE > NULL)

970+(.>)

971+ :: Expression outer grp commons schemas params from (nullity0 ty) -- ^ lhs

972+ -> Expression outer grp commons schemas params from (nullity1 ty) -- ^ rhs

973+ -> Condition outer grp commons schemas params from

974+(.>) = unsafeBinaryOp ">"

975+infix 4 .>

976+

977+{- | between

978+>>> printSQL $ true `between` (null_, false)

979+TRUE BETWEEN NULL AND FALSE

980+-}

981+between

982+ :: Expression outer grp commons schemas params from (nullity ty)

983+ -> ( Expression outer grp commons schemas params from (nullity ty)

984+ , Expression outer grp commons schemas params from (nullity ty) ) -- ^ bounds

985+ -> Condition outer grp commons schemas params from

986+between a (x,y) = UnsafeExpression $ renderSQL a <+> "BETWEEN"

987+ <+> renderSQL x <+> "AND" <+> renderSQL y

988+

989+{- | not between

990+>>> printSQL $ true `notBetween` (null_, false)

991+TRUE NOT BETWEEN NULL AND FALSE

992+-}

993+notBetween

994+ :: Expression outer grp commons schemas params from (nullity ty)

995+ -> ( Expression outer grp commons schemas params from (nullity ty)

996+ , Expression outer grp commons schemas params from (nullity ty) ) -- ^ bounds

997+ -> Condition outer grp commons schemas params from

998+notBetween a (x,y) = UnsafeExpression $ renderSQL a <+> "NOT BETWEEN"

999+ <+> renderSQL x <+> "AND" <+> renderSQL y

1000+

1001+{- | between, after sorting the comparison values

1002+>>> printSQL $ true `betweenSymmetric` (null_, false)

1003+TRUE BETWEEN SYMMETRIC NULL AND FALSE

1004+-}

1005+betweenSymmetric

1006+ :: Expression outer grp commons schemas params from (nullity ty)

1007+ -> ( Expression outer grp commons schemas params from (nullity ty)

1008+ , Expression outer grp commons schemas params from (nullity ty) ) -- ^ bounds

1009+ -> Condition outer grp commons schemas params from

1010+betweenSymmetric a (x,y) = UnsafeExpression $ renderSQL a

1011+ <+> "BETWEEN SYMMETRIC" <+> renderSQL x <+> "AND" <+> renderSQL y

1012+

1013+{- | not between, after sorting the comparison values

1014+>>> printSQL $ true `notBetweenSymmetric` (null_, false)

1015+TRUE NOT BETWEEN SYMMETRIC NULL AND FALSE

1016+-}

1017+notBetweenSymmetric

1018+ :: Expression outer grp commons schemas params from (nullity ty)

1019+ -> ( Expression outer grp commons schemas params from (nullity ty)

1020+ , Expression outer grp commons schemas params from (nullity ty) ) -- ^ bounds

1021+ -> Condition outer grp commons schemas params from

1022+notBetweenSymmetric a (x,y) = UnsafeExpression $ renderSQL a

1023+ <+> "NOT BETWEEN SYMMETRIC" <+> renderSQL x <+> "AND" <+> renderSQL y

1024+

1025+{- | not equal, treating null like an ordinary value

1026+>>> printSQL $ true `isDistinctFrom` null_

1027+(TRUE IS DISTINCT FROM NULL)

1028+-}

1029+isDistinctFrom

1030+ :: Expression outer grp commons schemas params from (nullity ty)

1031+ -> Expression outer grp commons schemas params from (nullity ty)

1032+ -> Condition outer grp commons schemas params from

1033+isDistinctFrom = unsafeBinaryOp "IS DISTINCT FROM"

1034+

1035+{- | equal, treating null like an ordinary value

1036+>>> printSQL $ true `isNotDistinctFrom` null_

1037+(TRUE IS NOT DISTINCT FROM NULL)

1038+-}

1039+isNotDistinctFrom

1040+ :: Expression outer grp commons schemas params from (nullity ty)

1041+ -> Expression outer grp commons schemas params from (nullity ty)

1042+ -> Condition outer grp commons schemas params from

1043+isNotDistinctFrom = unsafeBinaryOp "IS NOT DISTINCT FROM"

1044+

1045+{- | is true

1046+>>> printSQL $ true & isTrue

1047+TRUE IS TRUE

1048+-}

1049+isTrue

1050+ :: Expression outer grp commons schemas params from (nullity 'PGbool)

1051+ -> Condition outer grp commons schemas params from

1052+isTrue b = UnsafeExpression $ renderSQL b <+> "IS TRUE"

1053+

1054+{- | is false or unknown

1055+>>> printSQL $ true & isNotTrue

1056+TRUE IS NOT TRUE

1057+-}

1058+isNotTrue

1059+ :: Expression outer grp commons schemas params from (nullity 'PGbool)

1060+ -> Condition outer grp commons schemas params from

1061+isNotTrue b = UnsafeExpression $ renderSQL b <+> "IS NOT TRUE"

1062+

1063+{- | is false

1064+>>> printSQL $ true & isFalse

1065+TRUE IS FALSE

1066+-}

1067+isFalse

1068+ :: Expression outer grp commons schemas params from (nullity 'PGbool)

1069+ -> Condition outer grp commons schemas params from

1070+isFalse b = UnsafeExpression $ renderSQL b <+> "IS FALSE"

1071+

1072+{- | is true or unknown

1073+>>> printSQL $ true & isNotFalse

1074+TRUE IS NOT FALSE

1075+-}

1076+isNotFalse

1077+ :: Expression outer grp commons schemas params from (nullity 'PGbool)

1078+ -> Condition outer grp commons schemas params from

1079+isNotFalse b = UnsafeExpression $ renderSQL b <+> "IS NOT FALSE"

1080+

1081+{- | is unknown

1082+>>> printSQL $ true & isUnknown

1083+TRUE IS UNKNOWN

1084+-}

1085+isUnknown

1086+ :: Expression outer grp commons schemas params from (nullity 'PGbool)

1087+ -> Condition outer grp commons schemas params from

1088+isUnknown b = UnsafeExpression $ renderSQL b <+> "IS UNKNOWN"

1089+

1090+{- | is true or false

1091+>>> printSQL $ true & isNotUnknown

1092+TRUE IS NOT UNKNOWN

1093+-}

1094+isNotUnknown

1095+ :: Expression outer grp commons schemas params from (nullity 'PGbool)

1096+ -> Condition outer grp commons schemas params from

1097+isNotUnknown b = UnsafeExpression $ renderSQL b <+> "IS NOT UNKNOWN"

1098+

1099+-- | >>> printSQL currentDate

1100+-- CURRENT_DATE

1101+currentDate

1102+ :: Expression outer grp commons schemas params from (nullity 'PGdate)

1103+currentDate = UnsafeExpression "CURRENT_DATE"

1104+

1105+-- | >>> printSQL currentTime

1106+-- CURRENT_TIME

1107+currentTime

1108+ :: Expression outer grp commons schemas params from (nullity 'PGtimetz)

1109+currentTime = UnsafeExpression "CURRENT_TIME"

1110+

1111+-- | >>> printSQL currentTimestamp

1112+-- CURRENT_TIMESTAMP

1113+currentTimestamp

1114+ :: Expression outer grp commons schemas params from (nullity 'PGtimestamptz)

1115+currentTimestamp = UnsafeExpression "CURRENT_TIMESTAMP"

1116+

1117+-- | >>> printSQL localTime

1118+-- LOCALTIME

1119+localTime

1120+ :: Expression outer grp commons schemas params from (nullity 'PGtime)

1121+localTime = UnsafeExpression "LOCALTIME"

1122+

1123+-- | >>> printSQL localTimestamp

1124+-- LOCALTIMESTAMP

1125+localTimestamp

1126+ :: Expression outer grp commons schemas params from (nullity 'PGtimestamp)

1127+localTimestamp = UnsafeExpression "LOCALTIMESTAMP"

1128+

1129+{-----------------------------------------

1130+text

1131+-----------------------------------------}

1132+

1133+escape :: Char -> String

1134+escape = \case

1135+ '\NUL' -> "\\0"

1136+ '\'' -> "''"

1137+ '"' -> "\\\""

1138+ '\b' -> "\\b"

1139+ '\n' -> "\\n"

1140+ '\r' -> "\\r"

1141+ '\t' -> "\\t"

1142+ '\\' -> "\\\\"

1143+ c -> [c]

438

1144

439instance IsString

1145instance IsString

440− (Expression outer commons grp schemas params from (null 'PGtext)) where

1146+ (Expression outer grp commons schemas params from (nullity 'PGtext)) where

441 fromString str = UnsafeExpression $

1147 fromString str = UnsafeExpression $

442 "E\'" <> fromString (escape =<< str) <> "\'"

1148 "E\'" <> fromString (escape =<< str) <> "\'"

443instance IsString

1149instance IsString

444− (Expression outer commons grp schemas params from (null 'PGtsvector)) where

1150+ (Expression outer grp commons schemas params from (nullity 'PGtsvector)) where

445− fromString str = UnsafeExpression . parenthesized . (<> " :: tsvector") $

1151+ fromString str = cast tsvector . UnsafeExpression $

446 "E\'" <> fromString (escape =<< str) <> "\'"

1152 "E\'" <> fromString (escape =<< str) <> "\'"

447instance IsString

1153instance IsString

448− (Expression outer commons grp schemas params from (null 'PGtsquery)) where

1154+ (Expression outer grp commons schemas params from (nullity 'PGtsquery)) where

449− fromString str = UnsafeExpression . parenthesized . (<> " :: tsquery") $

1155+ fromString str = cast tsquery . UnsafeExpression $

450 "E\'" <> fromString (escape =<< str) <> "\'"

1156 "E\'" <> fromString (escape =<< str) <> "\'"

451

1157

452instance Semigroup

1158instance 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

1159+ (Expression outer grp commons schemas params from (nullity 'PGtext)) where

457 (<>) = unsafeBinaryOp "||"

1160 (<>) = unsafeBinaryOp "||"

458instance Semigroup

1161instance 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

1162+ (Expression outer grp commons schemas params from (nullity 'PGtsvector)) where

463 (<>) = unsafeBinaryOp "||"

1163 (<>) = unsafeBinaryOp "||"

464

1164

465instance Monoid

1165instance Monoid

466− (Expression outer commons grp schemas params from (null 'PGtext)) where

1166+ (Expression outer grp commons schemas params from (nullity 'PGtext)) where

467 mempty = fromString ""

1167 mempty = fromString ""

468 mappend = (<>)

1168 mappend = (<>)

469instance Monoid

1169instance Monoid

470− (Expression outer commons grp schemas params from (null 'PGtsvector)) where

1170+ (Expression outer grp commons schemas params from (nullity 'PGtsvector)) where

471 mempty = fromString ""

1171 mempty = fromString ""

472 mappend = (<>)

1172 mappend = (<>)

1173+

1174+-- | >>> printSQL $ lower "ARRRGGG"

1175+-- lower(E'ARRRGGG')

1176+lower

1177+ :: Expression outer grp commons schemas params from (nullity 'PGtext)

1178+ -- ^ string to lower case

1179+ -> Expression outer grp commons schemas params from (nullity 'PGtext)

1180+lower = unsafeFunction "lower"

1181+

1182+-- | >>> printSQL $ upper "eeee"

1183+-- upper(E'eeee')

1184+upper

1185+ :: Expression outer grp commons schemas params from (nullity 'PGtext)

1186+ -- ^ string to upper case

1187+ -> Expression outer grp commons schemas params from (nullity 'PGtext)

1188+upper = unsafeFunction "upper"

1189+

1190+-- | >>> printSQL $ charLength "four"

1191+-- char_length(E'four')

1192+charLength

1193+ :: Expression outer grp commons schemas params from (nullity 'PGtext)

1194+ -- ^ string to measure

1195+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

1196+charLength = unsafeFunction "char_length"

1197+

1198+-- | The `like` expression returns true if the @string@ matches

1199+-- the supplied @pattern@. If @pattern@ does not contain percent signs

1200+-- or underscores, then the pattern only represents the string itself;

1201+-- in that case `like` acts like the equals operator. An underscore (_)

1202+-- in pattern stands for (matches) any single character; a percent sign (%)

1203+-- matches any sequence of zero or more characters.

1204+--

1205+-- >>> printSQL $ "abc" `like` "a%"

1206+-- (E'abc' LIKE E'a%')

1207+like

1208+ :: Expression outer grp commons schemas params from (nullity 'PGtext)

1209+ -- ^ string

1210+ -> Expression outer grp commons schemas params from (nullity 'PGtext)

1211+ -- ^ pattern

1212+ -> Expression outer grp commons schemas params from (nullity 'PGbool)

1213+like = unsafeBinaryOp "LIKE"

1214+

1215+-- | The key word ILIKE can be used instead of LIKE to make the

1216+-- match case-insensitive according to the active locale.

1217+--

1218+-- >>> printSQL $ "abc" `ilike` "a%"

1219+-- (E'abc' ILIKE E'a%')

1220+ilike

1221+ :: Expression outer grp commons schemas params from (nullity 'PGtext)

1222+ -- ^ string

1223+ -> Expression outer grp commons schemas params from (nullity 'PGtext)

1224+ -- ^ pattern

1225+ -> Expression outer grp commons schemas params from (nullity 'PGbool)

1226+ilike = unsafeBinaryOp "ILIKE"

1227+

1228+{-----------------------------------------

1229+ -- json and jsonb support

1230+

1231+See https://www.postgresql.org/docs/10/static/functions-json.html -- most

1232+comments lifted directly from this page.

1233+

1234+Table 9.44: json and jsonb operators

1235+-----------------------------------------}

1236+

1237+-- | Get JSON value (object field or array element) at a key.

1238+(.->)

1239+ :: (json `In` PGJsonType, key `In` PGJsonKey)

1240+ => Expression outer grp commons schemas params from (nullity json)

1241+ -> Expression outer grp commons schemas params from (nullity key)

1242+ -> Expression outer grp commons schemas params from ('Null json)

1243+infixl 8 .->

1244+(.->) = unsafeBinaryOp "->"

1245+

1246+-- | Get JSON value (object field or array element) at a key, as text.

1247+(.->>)

1248+ :: (json `In` PGJsonType, key `In` PGJsonKey)

1249+ => Expression outer grp commons schemas params from (nullity json)

1250+ -> Expression outer grp commons schemas params from (nullity key)

1251+ -> Expression outer grp commons schemas params from ('Null 'PGtext)

1252+infixl 8 .->>

1253+(.->>) = unsafeBinaryOp "->>"

1254+

1255+-- | Get JSON value at a specified path.

1256+(.#>)

1257+ :: (json `In` PGJsonType, PGTextArray "(.#>)" path)

1258+ => Expression outer grp commons schemas params from (nullity json)

1259+ -> Expression outer grp commons schemas params from (nullity path)

1260+ -> Expression outer grp commons schemas params from ('Null json)

1261+infixl 8 .#>

1262+(.#>) = unsafeBinaryOp "#>"

1263+

1264+-- | Get JSON value at a specified path as text.

1265+(.#>>)

1266+ :: (json `In` PGJsonType, PGTextArray "(.#>>)" path)

1267+ => Expression outer grp commons schemas params from (nullity json)

1268+ -> Expression outer grp commons schemas params from (nullity path)

1269+ -> Expression outer grp commons schemas params from ('Null 'PGtext)

1270+infixl 8 .#>>

1271+(.#>>) = unsafeBinaryOp "#>>"

1272+

1273+-- Additional jsonb operators

1274+

1275+-- | Does the left JSON value contain the right JSON path/value entries at the

1276+-- top level?

1277+(.@>)

1278+ :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1279+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1280+ -> Condition outer grp commons schemas params from

1281+infixl 9 .@>

1282+(.@>) = unsafeBinaryOp "@>"

1283+

1284+-- | Are the left JSON path/value entries contained at the top level within the

1285+-- right JSON value?

1286+(.<@)

1287+ :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1288+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1289+ -> Condition outer grp commons schemas params from

1290+infixl 9 .<@

1291+(.<@) = unsafeBinaryOp "<@"

1292+

1293+-- | Does the string exist as a top-level key within the JSON value?

1294+(.?)

1295+ :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1296+ -> Expression outer grp commons schemas params from (nullity 'PGtext)

1297+ -> Condition outer grp commons schemas params from

1298+infixl 9 .?

1299+(.?) = unsafeBinaryOp "?"

1300+

1301+-- | Do any of these array strings exist as top-level keys?

1302+(.?|)

1303+ :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1304+ -> Expression outer grp commons schemas params from (nullity ('PGvararray ('NotNull 'PGtext)))

1305+ -> Condition outer grp commons schemas params from

1306+infixl 9 .?|

1307+(.?|) = unsafeBinaryOp "?|"

1308+

1309+-- | Do all of these array strings exist as top-level keys?

1310+(.?&)

1311+ :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1312+ -> Expression outer grp commons schemas params from (nullity ('PGvararray ('NotNull 'PGtext)))

1313+ -> Condition outer grp commons schemas params from

1314+infixl 9 .?&

1315+(.?&) = unsafeBinaryOp "?&"

1316+

1317+-- | Concatenate two jsonb values into a new jsonb value.

1318+instance Semigroup

1319+ (Expression outer grp commons schemas params from (nullity 'PGjsonb)) where

1320+ (<>) = unsafeBinaryOp "||"

1321+

1322+-- | Delete a key or keys from a JSON object, or remove an array element.

1323+--

1324+-- If the right operand is..

1325+--

1326+-- @ text @: Delete key/value pair or string element from left operand. Key/value pairs

1327+-- are matched based on their key value.

1328+--

1329+-- @ text[] @: Delete multiple key/value pairs or string elements

1330+-- from left operand. Key/value pairs are matched based on their key value.

1331+--

1332+-- @ integer @: Delete the array element with specified index (Negative integers

1333+-- count from the end). Throws an error if top level container is not an array.

1334+(.-.)

1335+ :: (key `In` '[ 'PGtext, 'PGvararray ('NotNull 'PGtext), 'PGint4, 'PGint2 ]) -- hlint error without parens here

1336+ => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1337+ -> Expression outer grp commons schemas params from (nullity key)

1338+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1339+infixl 6 .-.

1340+(.-.) = unsafeBinaryOp "-"

1341+

1342+-- | Delete the field or element with specified path (for JSON arrays, negative

1343+-- integers count from the end)

1344+(#-.)

1345+ :: PGTextArray "(#-.)" arrayty

1346+ => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1347+ -> Expression outer grp commons schemas params from (nullity arrayty)

1348+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1349+infixl 6 #-.

1350+(#-.) = unsafeBinaryOp "#-"

1351+

1352+{-----------------------------------------

1353+Table 9.45: JSON creation functions

1354+-----------------------------------------}

1355+

1356+-- | Literal binary JSON

1357+jsonbLit

1358+ :: JSON.ToJSON x

1359+ => x -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1360+jsonbLit = cast jsonb . UnsafeExpression

1361+ . singleQuotedUtf8 . toStrict . JSON.encode

1362+

1363+-- | Literal JSON

1364+jsonLit

1365+ :: JSON.ToJSON x

1366+ => x -> Expression outer grp commons schemas params from (nullity 'PGjson)

1367+jsonLit = cast json . UnsafeExpression

1368+ . singleQuotedUtf8 . toStrict . JSON.encode

1369+

1370+-- | Returns the value as json. Arrays and composites are converted

1371+-- (recursively) to arrays and objects; otherwise, if there is a cast from the

1372+-- type to json, the cast function will be used to perform the conversion;

1373+-- otherwise, a scalar value is produced. For any scalar type other than a

1374+-- number, a Boolean, or a null value, the text representation will be used, in

1375+-- such a fashion that it is a valid json value.

1376+toJson

1377+ :: Expression outer grp commons schemas params from (nullity ty)

1378+ -> Expression outer grp commons schemas params from (nullity 'PGjson)

1379+toJson = unsafeFunction "to_json"

1380+

1381+-- | Returns the value as jsonb. Arrays and composites are converted

1382+-- (recursively) to arrays and objects; otherwise, if there is a cast from the

1383+-- type to json, the cast function will be used to perform the conversion;

1384+-- otherwise, a scalar value is produced. For any scalar type other than a

1385+-- number, a Boolean, or a null value, the text representation will be used, in

1386+-- such a fashion that it is a valid jsonb value.

1387+toJsonb

1388+ :: Expression outer grp commons schemas params from (nullity ty)

1389+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1390+toJsonb = unsafeFunction "to_jsonb"

1391+

1392+-- | Returns the array as a JSON array. A PostgreSQL multidimensional array

1393+-- becomes a JSON array of arrays.

1394+arrayToJson

1395+ :: PGArray "arrayToJson" arr

1396+ => Expression outer grp commons schemas params from (nullity arr)

1397+ -> Expression outer grp commons schemas params from (nullity 'PGjson)

1398+arrayToJson = unsafeFunction "array_to_json"

1399+

1400+-- | Returns the row as a JSON object.

1401+rowToJson

1402+ :: Expression outer grp commons schemas params from (nullity ('PGcomposite ty))

1403+ -> Expression outer grp commons schemas params from (nullity 'PGjson)

1404+rowToJson = unsafeFunction "row_to_json"

1405+

1406+-- | Builds a possibly-heterogeneously-typed JSON array out of a variadic

1407+-- argument list.

1408+jsonBuildArray

1409+ :: SListI elems

1410+ => NP (Expression outer grp commons schemas params from) elems

1411+ -> Expression outer grp commons schemas params from (nullity 'PGjson)

1412+jsonBuildArray = unsafeVariadicFunction "json_build_array"

1413+

1414+-- | Builds a possibly-heterogeneously-typed (binary) JSON array out of a

1415+-- variadic argument list.

1416+jsonbBuildArray

1417+ :: SListI elems

1418+ => NP (Expression outer grp commons schemas params from) elems

1419+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1420+jsonbBuildArray = unsafeVariadicFunction "jsonb_build_array"

1421+

1422+unsafeRowFunction

1423+ :: SOP.SListI elems

1424+ => NP (Aliased (Expression outer grp commons schemas params from)) elems

1425+ -> [ByteString]

1426+unsafeRowFunction =

1427+ (`appEndo` []) . hcfoldMap (Proxy :: SOP.Proxy SOP.Top)

1428+ (\(col `As` name) -> Endo $ \xs ->

1429+ renderAliasString name : renderSQL col : xs)

1430+ where

1431+ renderAliasString :: KnownSymbol alias => Alias alias -> ByteString

1432+ renderAliasString = singleQuotedText . fromString . symbolVal

1433+

1434+-- | Builds a possibly-heterogeneously-typed JSON object out of a variadic

1435+-- argument list. The elements of the argument list must alternate between text

1436+-- and values.

1437+jsonBuildObject

1438+ :: SOP.SListI elems

1439+ => NP (Aliased (Expression outer grp commons schemas params from)) elems

1440+ -> Expression outer grp commons schemas params from (nullity 'PGjson)

1441+jsonBuildObject

1442+ = unsafeFunction "json_build_object"

1443+ . UnsafeExpression

1444+ . commaSeparated

1445+ . unsafeRowFunction

1446+

1447+-- | Builds a possibly-heterogeneously-typed (binary) JSON object out of a

1448+-- variadic argument list. The elements of the argument list must alternate

1449+-- between text and values.

1450+jsonbBuildObject

1451+ :: SOP.SListI elems

1452+ => NP (Aliased (Expression outer grp commons schemas params from)) elems

1453+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1454+jsonbBuildObject

1455+ = unsafeFunction "jsonb_build_object"

1456+ . UnsafeExpression

1457+ . commaSeparated

1458+ . unsafeRowFunction

1459+

1460+-- | Builds a JSON object out of a text array. The array must have either

1461+-- exactly one dimension with an even number of members, in which case they are

1462+-- taken as alternating key/value pairs, or two dimensions such that each inner

1463+-- array has exactly two elements, which are taken as a key/value pair.

1464+jsonObject

1465+ :: PGArrayOf "jsonObject" arr ('NotNull 'PGtext)

1466+ => Expression outer grp commons schemas params from (nullity arr)

1467+ -> Expression outer grp commons schemas params from (nullity 'PGjson)

1468+jsonObject = unsafeFunction "json_object"

1469+

1470+-- | Builds a binary JSON object out of a text array. The array must have either

1471+-- exactly one dimension with an even number of members, in which case they are

1472+-- taken as alternating key/value pairs, or two dimensions such that each inner

1473+-- array has exactly two elements, which are taken as a key/value pair.

1474+jsonbObject

1475+ :: PGArrayOf "jsonbObject" arr ('NotNull 'PGtext)

1476+ => Expression outer grp commons schemas params from (nullity arr)

1477+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1478+jsonbObject = unsafeFunction "jsonb_object"

1479+

1480+-- | This is an alternate form of 'jsonObject' that takes two arrays; one for

1481+-- keys and one for values, that are zipped pairwise to create a JSON object.

1482+jsonZipObject

1483+ :: ( PGArrayOf "jsonZipObject" keysArray ('NotNull 'PGtext)

1484+ , PGArrayOf "jsonZipObject" valuesArray ('NotNull 'PGtext))

1485+ => Expression outer grp commons schemas params from (nullity keysArray)

1486+ -> Expression outer grp commons schemas params from (nullity valuesArray)

1487+ -> Expression outer grp commons schemas params from (nullity 'PGjson)

1488+jsonZipObject ks vs =

1489+ unsafeVariadicFunction "json_object" (ks :* vs :* Nil)

1490+

1491+-- | This is an alternate form of 'jsonObject' that takes two arrays; one for

1492+-- keys and one for values, that are zipped pairwise to create a binary JSON

1493+-- object.

1494+jsonbZipObject

1495+ :: ( PGArrayOf "jsonbZipObject" keysArray ('NotNull 'PGtext)

1496+ , PGArrayOf "jsonbZipObject" valuesArray ('NotNull 'PGtext))

1497+ => Expression outer grp commons schemas params from (nullity keysArray)

1498+ -> Expression outer grp commons schemas params from (nullity valuesArray)

1499+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1500+jsonbZipObject ks vs =

1501+ unsafeVariadicFunction "jsonb_object" (ks :* vs :* Nil)

1502+

1503+{-----------------------------------------

1504+Table 9.46: JSON processing functions

1505+-----------------------------------------}

1506+

1507+-- | Returns the number of elements in the outermost JSON array.

1508+jsonArrayLength

1509+ :: Expression outer grp commons schemas params from (nullity 'PGjson)

1510+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

1511+jsonArrayLength = unsafeFunction "json_array_length"

1512+

1513+-- | Returns the number of elements in the outermost binary JSON array.

1514+jsonbArrayLength

1515+ :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1516+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

1517+jsonbArrayLength = unsafeFunction "jsonb_array_length"

1518+

1519+-- | Returns JSON value pointed to by the given path (equivalent to #>

1520+-- operator).

1521+jsonExtractPath

1522+ :: SListI elems

1523+ => Expression outer grp commons schemas params from (nullity 'PGjson)

1524+ -> NP (Expression outer grp commons schemas params from) elems

1525+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1526+jsonExtractPath x xs =

1527+ unsafeVariadicFunction "json_extract_path" (x :* xs)

1528+

1529+-- | Returns JSON value pointed to by the given path (equivalent to #>

1530+-- operator).

1531+jsonbExtractPath

1532+ :: SListI elems

1533+ => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1534+ -> NP (Expression outer grp commons schemas params from) elems

1535+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1536+jsonbExtractPath x xs =

1537+ unsafeVariadicFunction "jsonb_extract_path" (x :* xs)

1538+

1539+-- | Returns JSON value pointed to by the given path (equivalent to #>

1540+-- operator), as text.

1541+jsonExtractPathAsText

1542+ :: SListI elems

1543+ => Expression outer grp commons schemas params from (nullity 'PGjson)

1544+ -> NP (Expression outer grp commons schemas params from) elems

1545+ -> Expression outer grp commons schemas params from (nullity 'PGjson)

1546+jsonExtractPathAsText x xs =

1547+ unsafeVariadicFunction "json_extract_path_text" (x :* xs)

1548+

1549+-- | Returns JSON value pointed to by the given path (equivalent to #>

1550+-- operator), as text.

1551+jsonbExtractPathAsText

1552+ :: SListI elems

1553+ => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1554+ -> NP (Expression outer grp commons schemas params from) elems

1555+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1556+jsonbExtractPathAsText x xs =

1557+ unsafeVariadicFunction "jsonb_extract_path_text" (x :* xs)

1558+

1559+-- | Returns the type of the outermost JSON value as a text string. Possible

1560+-- types are object, array, string, number, boolean, and null.

1561+jsonTypeof

1562+ :: Expression outer grp commons schemas params from (nullity 'PGjson)

1563+ -> Expression outer grp commons schemas params from (nullity 'PGtext)

1564+jsonTypeof = unsafeFunction "json_typeof"

1565+

1566+-- | Returns the type of the outermost binary JSON value as a text string.

1567+-- Possible types are object, array, string, number, boolean, and null.

1568+jsonbTypeof

1569+ :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1570+ -> Expression outer grp commons schemas params from (nullity 'PGtext)

1571+jsonbTypeof = unsafeFunction "jsonb_typeof"

1572+

1573+-- | Returns its argument with all object fields that have null values omitted.

1574+-- Other null values are untouched.

1575+jsonStripNulls

1576+ :: Expression outer grp commons schemas params from (nullity 'PGjson)

1577+ -> Expression outer grp commons schemas params from (nullity 'PGjson)

1578+jsonStripNulls = unsafeFunction "json_strip_nulls"

1579+

1580+-- | Returns its argument with all object fields that have null values omitted.

1581+-- Other null values are untouched.

1582+jsonbStripNulls

1583+ :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1584+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1585+jsonbStripNulls = unsafeFunction "jsonb_strip_nulls"

1586+

1587+-- | @ jsonbSet target path new_value create_missing @

1588+--

1589+-- Returns target with the section designated by path replaced by new_value,

1590+-- or with new_value added if create_missing is true ( default is true) and the

1591+-- item designated by path does not exist. As with the path orientated

1592+-- operators, negative integers that appear in path count from the end of JSON

1593+-- arrays.

1594+jsonbSet

1595+ :: PGTextArray "jsonbSet" arr

1596+ => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1597+ -> Expression outer grp commons schemas params from (nullity arr)

1598+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1599+ -> Maybe (Expression outer grp commons schemas params from (nullity 'PGbool))

1600+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1601+jsonbSet tgt path val createMissing = case createMissing of

1602+ Just m -> unsafeVariadicFunction "jsonb_set" (tgt :* path :* val :* m :* Nil)

1603+ Nothing -> unsafeVariadicFunction "jsonb_set" (tgt :* path :* val :* Nil)

1604+

1605+-- | @ jsonbInsert target path new_value insert_after @

1606+--

1607+-- Returns target with new_value inserted. If target section designated by

1608+-- path is in a JSONB array, new_value will be inserted before target or after

1609+-- if insert_after is true (default is false). If target section designated by

1610+-- path is in JSONB object, new_value will be inserted only if target does not

1611+-- exist. As with the path orientated operators, negative integers that appear

1612+-- in path count from the end of JSON arrays.

1613+jsonbInsert

1614+ :: PGTextArray "jsonbInsert" arr

1615+ => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1616+ -> Expression outer grp commons schemas params from (nullity arr)

1617+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1618+ -> Maybe (Expression outer grp commons schemas params from (nullity 'PGbool))

1619+ -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1620+jsonbInsert tgt path val insertAfter = case insertAfter of

1621+ Just i -> unsafeVariadicFunction "jsonb_insert" (tgt :* path :* val :* i :* Nil)

1622+ Nothing -> unsafeVariadicFunction "jsonb_insert" (tgt :* path :* val :* Nil)

1623+

1624+-- | Returns its argument as indented JSON text.

1625+jsonbPretty

1626+ :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1627+ -> Expression outer grp commons schemas params from (nullity 'PGtext)

1628+jsonbPretty = unsafeFunction "jsonb_pretty"

1629+

1630+(@@) :: ComparisonOperator (nullity 'PGtsvector) (nullity 'PGtsquery)

1631+(@@) = unsafeBinaryOp "@@"

1632+

1633+(.&) :: Operator (nullity 'PGtsquery) (nullity 'PGtsquery) (nullity 'PGtsquery)

1634+(.&) = unsafeBinaryOp "&&"

1635+

1636+(.|) :: Operator (nullity 'PGtsquery) (nullity 'PGtsquery) (nullity 'PGtsquery)

1637+(.|) = unsafeBinaryOp "||"

1638+

1639+(.!)

1640+ :: Expression outer grp commons schemas params from (nullity 'PGtsquery)

1641+ -> Expression outer grp commons schemas params from (nullity 'PGtsquery)

1642+(.!) = unsafeUnaryOp "!!"

1643+

1644+(<->) :: Operator (nullity 'PGtsquery) (nullity 'PGtsquery) (nullity 'PGtsquery)

1645+(<->) = unsafeBinaryOp "<->"

1646+

1647+arrayToTSvector

1648+ :: Expression outer grp commons schemas params from (nullity ('PGvararray ('NotNull 'PGtext)))

1649+ -> Expression outer grp commons schemas params from (nullity 'PGtsvector)

1650+arrayToTSvector = unsafeFunction "array_to_tsvector"

1651+

1652+tsvectorLength

1653+ :: Expression outer grp commons schemas params from (nullity 'PGtsvector)

1654+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

1655+tsvectorLength = unsafeFunction "length"

1656+

1657+numnode

1658+ :: Expression outer grp commons schemas params from (nullity 'PGtsquery)

1659+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

1660+numnode = unsafeFunction "numnode"

1661+

1662+plainToTSquery

1663+ :: Expression outer grp commons schemas params from (nullity 'PGtext)

1664+ -> Expression outer grp commons schemas params from (nullity 'PGtext)

1665+ -> Expression outer grp commons schemas params from (nullity 'PGtsquery)

1666+plainToTSquery = unsafeFunction2 "plainto_tsquery"

1667+

1668+phraseToTSquery

1669+ :: Expression outer grp commons schemas params from (nullity 'PGtext)

1670+ -> Expression outer grp commons schemas params from (nullity 'PGtext)

1671+ -> Expression outer grp commons schemas params from (nullity 'PGtsquery)

1672+phraseToTSquery = unsafeFunction2 "phraseto_tsquery"

1673+

1674+websearchToTSquery

1675+ :: Expression outer grp commons schemas params from (nullity 'PGtext)

1676+ -> Expression outer grp commons schemas params from (nullity 'PGtext)

1677+ -> Expression outer grp commons schemas params from (nullity 'PGtsquery)

1678+websearchToTSquery = unsafeFunction2 "websearch_to_tsquery"

1679+

1680+queryTree

1681+ :: Expression outer grp commons schemas params from (nullity 'PGtsquery)

1682+ -> Expression outer grp commons schemas params from (nullity 'PGtext)

1683+queryTree = unsafeFunction "query_tree"

1684+

1685+toTSquery

1686+ :: Expression outer grp commons schemas params from (nullity 'PGtext)

1687+ -> Expression outer grp commons schemas params from (nullity 'PGtext)

1688+ -> Expression outer grp commons schemas params from (nullity 'PGtsquery)

1689+toTSquery = unsafeFunction2 "to_tsquery"

1690+

1691+toTSvector

1692+ :: ty `In` '[ 'PGtext, 'PGjson, 'PGjsonb]

1693+ => Expression outer grp commons schemas params from (nullity 'PGtext)

1694+ -> Expression outer grp commons schemas params from (nullity ty)

1695+ -> Expression outer grp commons schemas params from (nullity 'PGtsquery)

1696+toTSvector = unsafeFunction2 "to_tsvector"

1697+

1698+{-----------------------------------------

1699+aggregation

1700+-----------------------------------------}

1701+

1702+{- |

1703+`Aggregate` functions compute a single result from a set of input values.

1704+`Aggregate` functions can be used as `GroupedBy` `Expression`s as well

1705+as `WindowFunction`s.

1706+-}

1707+class Aggregate expr1 expr2 aggr

1708+ | aggr -> expr1, aggr -> expr2 where

1709+

1710+ -- | A special aggregation that does not require an input

1711+ --

1712+ -- >>> :{

1713+ -- let

1714+ -- expression :: Expression '[] ('Grouped bys) commons schemas params from ('NotNull 'PGint8)

1715+ -- expression = countStar

1716+ -- in printSQL expression

1717+ -- :}

1718+ -- count(*)

1719+ countStar :: aggr ('NotNull 'PGint8)

1720+

1721+ -- | >>> :{

1722+ -- let

1723+ -- expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: nullity ty]] ('NotNull 'PGint8)

1724+ -- expression = count (All #col)

1725+ -- in printSQL expression

1726+ -- :}

1727+ -- count(ALL "col")

1728+ count

1729+ :: expr1 ty

1730+ -- ^ what to count

1731+ -> aggr ('NotNull 'PGint8)

1732+

1733+ -- | >>> :{

1734+ -- let

1735+ -- expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: 'Null 'PGnumeric]] ('NotNull 'PGnumeric)

1736+ -- expression = sum_ (Distinct #col)

1737+ -- in printSQL expression

1738+ -- :}

1739+ -- sum(DISTINCT "col")

1740+ sum_

1741+ :: ty `In` PGNum

1742+ => expr1 (nullity ty)

1743+ -> aggr ('NotNull ty)

1744+

1745+ -- | input values, including nulls, concatenated into an array

1746+ arrayAgg

1747+ :: expr1 ty

1748+ -> aggr ('Null ('PGvararray ty))

1749+

1750+ -- | aggregates values as a JSON array

1751+ jsonAgg

1752+ :: expr1 ty

1753+ -> aggr ('Null 'PGjson)

1754+

1755+ -- | aggregates values as a JSON array

1756+ jsonbAgg

1757+ :: expr1 ty

1758+ -> aggr ('Null 'PGjsonb)

1759+

1760+ {- |

1761+ the bitwise AND of all non-null input values, or null if none

1762+ >>> :{

1763+ let

1764+ expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: nullity 'PGint4]] ('Null 'PGint4)

1765+ expression = bitAnd (Distinct #col)

1766+ in printSQL expression

1767+ :}

1768+ bit_and(DISTINCT "col")

1769+ -}

1770+ bitAnd

1771+ :: int `In` PGIntegral

1772+ => expr1 (nullity int)

1773+ -- ^ what to aggregate

1774+ -> aggr ('Null int)

1775+

1776+ {- |

1777+ the bitwise OR of all non-null input values, or null if none

1778+

1779+ >>> :{

1780+ let

1781+ expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: nullity 'PGint4]] ('Null 'PGint4)

1782+ expression = bitOr (All #col)

1783+ in printSQL expression

1784+ :}

1785+ bit_or(ALL "col")

1786+ -}

1787+ bitOr

1788+ :: int `In` PGIntegral

1789+ => expr1 (nullity int)

1790+ -- ^ what to aggregate

1791+ -> aggr ('Null int)

1792+

1793+ {- |

1794+ true if all input values are true, otherwise false

1795+

1796+ >>> :{

1797+ let

1798+ winFun :: WindowFunction '[] 'Ungrouped commons schemas params '[tab ::: '["col" ::: nullity 'PGbool]] ('Null 'PGbool)

1799+ winFun = boolAnd #col

1800+ in printSQL winFun

1801+ :}

1802+ bool_and("col")

1803+ -}

1804+ boolAnd

1805+ :: expr1 (nullity 'PGbool)

1806+ -- ^ what to aggregate

1807+ -> aggr ('Null 'PGbool)

1808+

1809+ {- |

1810+ true if at least one input value is true, otherwise false

1811+

1812+ >>> :{

1813+ let

1814+ expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: nullity 'PGbool]] ('Null 'PGbool)

1815+ expression = boolOr (All #col)

1816+ in printSQL expression

1817+ :}

1818+ bool_or(ALL "col")

1819+ -}

1820+ boolOr

1821+ :: expr1(nullity 'PGbool)

1822+ -- ^ what to aggregate

1823+ -> aggr ('Null 'PGbool)

1824+

1825+ {- |

1826+ equivalent to `boolAnd`

1827+

1828+ >>> :{

1829+ let

1830+ expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: nullity 'PGbool]] ('Null 'PGbool)

1831+ expression = every (Distinct #col)

1832+ in printSQL expression

1833+ :}

1834+ every(DISTINCT "col")

1835+ -}

1836+ every

1837+ :: expr1 (nullity 'PGbool)

1838+ -- ^ what to aggregate

1839+ -> aggr ('Null 'PGbool)

1840+

1841+ {- |maximum value of expression across all input values-}

1842+ max_

1843+ :: expr1 (nullity ty)

1844+ -- ^ what to maximize

1845+ -> aggr ('Null ty)

1846+

1847+ -- | minimum value of expression across all input values

1848+ min_

1849+ :: expr1 (nullity ty)

1850+ -- ^ what to minimize

1851+ -> aggr ('Null ty)

1852+

1853+ -- | the average (arithmetic mean) of all input values

1854+ avg

1855+ :: expr1 (nullity ty)

1856+ -- ^ what to average

1857+ -> aggr ('Null (PGAvg ty))

1858+

1859+ {- | correlation coefficient

1860+ >>> :{

1861+ let

1862+ expression :: Expression '[] ('Grouped g) c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1863+ expression = corr (All (#y :*: #x))

1864+ in printSQL expression

1865+ :}

1866+ corr(ALL "y", "x")

1867+ -}

1868+ corr

1869+ :: expr2 (nullity 'PGfloat8)

1870+ -> aggr ('Null 'PGfloat8)

1871+

1872+ {- | population covariance

1873+ >>> :{

1874+ let

1875+ expression :: Expression '[] ('Grouped g) c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1876+ expression = covarPop (All (#y :*: #x))

1877+ in printSQL expression

1878+ :}

1879+ covar_pop(ALL "y", "x")

1880+ -}

1881+ covarPop

1882+ :: expr2 (nullity 'PGfloat8)

1883+ -> aggr ('Null 'PGfloat8)

1884+

1885+ {- | sample covariance

1886+ >>> :{

1887+ let

1888+ winFun :: WindowFunction '[] 'Ungrouped c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1889+ winFun = covarSamp (#y :*: #x)

1890+ in printSQL winFun

1891+ :}

1892+ covar_samp("y", "x")

1893+ -}

1894+ covarSamp

1895+ :: expr2 (nullity 'PGfloat8)

1896+ -> aggr ('Null 'PGfloat8)

1897+

1898+ {- | average of the independent variable (sum(X)/N)

1899+ >>> :{

1900+ let

1901+ expression :: Expression '[] ('Grouped g) c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1902+ expression = regrAvgX (All (#y :*: #x))

1903+ in printSQL expression

1904+ :}

1905+ regr_avgx(ALL "y", "x")

1906+ -}

1907+ regrAvgX

1908+ :: expr2 (nullity 'PGfloat8)

1909+ -> aggr ('Null 'PGfloat8)

1910+

1911+ {- | average of the dependent variable (sum(Y)/N)

1912+ >>> :{

1913+ let

1914+ winFun :: WindowFunction '[] 'Ungrouped c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1915+ winFun = regrAvgY (#y :*: #x)

1916+ in printSQL winFun

1917+ :}

1918+ regr_avgy("y", "x")

1919+ -}

1920+ regrAvgY

1921+ :: expr2 (nullity 'PGfloat8)

1922+ -> aggr ('Null 'PGfloat8)

1923+

1924+ {- | number of input rows in which both expressions are nonnull

1925+ >>> :{

1926+ let

1927+ winFun :: WindowFunction '[] 'Ungrouped c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGint8)

1928+ winFun = regrCount (#y :*: #x)

1929+ in printSQL winFun

1930+ :}

1931+ regr_count("y", "x")

1932+ -}

1933+ regrCount

1934+ :: expr2 (nullity 'PGfloat8)

1935+ -> aggr ('Null 'PGint8)

1936+

1937+ {- | y-intercept of the least-squares-fit linear equation determined by the (X, Y) pairs

1938+ >>> :{

1939+ let

1940+ expression :: Expression '[] ('Grouped g) c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1941+ expression = regrIntercept (All (#y :*: #x))

1942+ in printSQL expression

1943+ :}

1944+ regr_intercept(ALL "y", "x")

1945+ -}

1946+ regrIntercept

1947+ :: expr2 (nullity 'PGfloat8)

1948+ -> aggr ('Null 'PGfloat8)

1949+

1950+ -- | @regr_r2(Y, X)@, square of the correlation coefficient

1951+ regrR2

1952+ :: expr2 (nullity 'PGfloat8)

1953+ -> aggr ('Null 'PGfloat8)

1954+

1955+ -- | @regr_slope(Y, X)@, slope of the least-squares-fit linear equation

1956+ -- determined by the (X, Y) pairs

1957+ regrSlope

1958+ :: expr2 (nullity 'PGfloat8)

1959+ -> aggr ('Null 'PGfloat8)

1960+

1961+ -- | @regr_sxx(Y, X)@, sum(X^2) - sum(X)^2/N

1962+ -- (“sum of squares” of the independent variable)

1963+ regrSxx

1964+ :: expr2 (nullity 'PGfloat8)

1965+ -> aggr ('Null 'PGfloat8)

1966+

1967+ -- | @regr_sxy(Y, X)@, sum(X*Y) - sum(X) * sum(Y)/N

1968+ -- (“sum of products” of independent times dependent variable)

1969+ regrSxy

1970+ :: expr2 (nullity 'PGfloat8)

1971+ -> aggr ('Null 'PGfloat8)

1972+

1973+ -- | @regr_syy(Y, X)@, sum(Y^2) - sum(Y)^2/N

1974+ -- (“sum of squares” of the dependent variable)

1975+ regrSyy

1976+ :: expr2 (nullity 'PGfloat8)

1977+ -> aggr ('Null 'PGfloat8)

1978+

1979+ -- | historical alias for `stddevSamp`

1980+ stddev

1981+ :: expr1 (nullity ty)

1982+ -> aggr ('Null (PGAvg ty))

1983+

1984+ -- | population standard deviation of the input values

1985+ stddevPop

1986+ :: expr1 (nullity ty)

1987+ -> aggr ('Null (PGAvg ty))

1988+

1989+ -- | sample standard deviation of the input values

1990+ stddevSamp

1991+ :: expr1 (nullity ty)

1992+ -> aggr ('Null (PGAvg ty))

1993+

1994+ -- | historical alias for `varSamp`

1995+ variance

1996+ :: expr1 (nullity ty)

1997+ -> aggr ('Null (PGAvg ty))

1998+

1999+ -- | population variance of the input values

2000+ -- (square of the population standard deviation)

2001+ varPop

2002+ :: expr1 (nullity ty)

2003+ -> aggr ('Null (PGAvg ty))

2004+

2005+ -- | sample variance of the input values

2006+ -- (square of the sample standard deviation)

2007+ varSamp

2008+ :: expr1 (nullity ty)

2009+ -> aggr ('Null (PGAvg ty))

2010+

2011+{- |

2012+`Distinction`s are used for the input of `Aggregate` `Expression`s.

2013+`All` invokes the aggregate once for each input row.

2014+`Distinct` invokes the aggregate once for each distinct value of the expression

2015+(or distinct set of values, for multiple expressions) found in the input

2016+-}

2017+data Distinction expr ty

2018+ = All (expr ty)

2019+ | Distinct (expr ty)

2020+ deriving (GHC.Generic,Show,Eq,Ord)

2021+instance NFData (Distinction (Expression outer grp commons schemas params from) ty)

2022+instance RenderSQL (Distinction (Expression outer grp commons schemas params from) ty) where

2023+ renderSQL = \case

2024+ All x -> "ALL" <+> renderSQL x

2025+ Distinct x -> "DISTINCT" <+> renderSQL x

2026+instance RenderSQL

2027+ (Distinction

2028+ ( Expression outer grp commons schemas params from

2029+ :*:

2030+ Expression outer grp commons schemas params from) xty ) where

2031+ renderSQL = \case

2032+ All (x :*: x') ->

2033+ "ALL" <+> renderSQL x <> ", " <> renderSQL x'

2034+ Distinct (x :*: x') ->

2035+ "DISTINCT" <+> renderSQL x <> ", " <> renderSQL x'

2036+

2037+instance Aggregate

2038+ (Distinction (Expression outer 'Ungrouped commons schemas params from))

2039+ (Distinction (Expression outer 'Ungrouped commons schemas params from :*: Expression outer 'Ungrouped commons schemas params from))

2040+ (Expression outer ('Grouped bys) commons schemas params from) where

2041+ countStar = UnsafeExpression "count(*)"

2042+ count = unsafeAggregate1 "count"

2043+ sum_ = unsafeAggregate1 "sum"

2044+ arrayAgg = unsafeAggregate1 "array_agg"

2045+ jsonAgg = unsafeAggregate1 "json_agg"

2046+ jsonbAgg = unsafeAggregate1 "jsonb_agg"

2047+ bitAnd = unsafeAggregate1 "bit_and"

2048+ bitOr = unsafeAggregate1 "bit_or"

2049+ boolAnd = unsafeAggregate1 "bool_and"

2050+ boolOr = unsafeAggregate1 "bool_or"

2051+ every = unsafeAggregate1 "every"

2052+ max_ = unsafeAggregate1 "max"

2053+ min_ = unsafeAggregate1 "min"

2054+ avg = unsafeAggregate1 "avg"

2055+ corr = unsafeAggregate2 "corr"

2056+ covarPop = unsafeAggregate2 "covar_pop"

2057+ covarSamp = unsafeAggregate2 "covar_samp"

2058+ regrAvgX = unsafeAggregate2 "regr_avgx"

2059+ regrAvgY = unsafeAggregate2 "regr_avgy"

2060+ regrCount = unsafeAggregate2 "regr_count"

2061+ regrIntercept = unsafeAggregate2 "regr_intercept"

2062+ regrR2 = unsafeAggregate2 "regr_r2"

2063+ regrSlope = unsafeAggregate2 "regr_slope"

2064+ regrSxx = unsafeAggregate2 "regr_sxx"

2065+ regrSxy = unsafeAggregate2 "regr_sxy"

2066+ regrSyy = unsafeAggregate2 "regr_syy"

2067+ stddev = unsafeAggregate1 "stddev"

2068+ stddevPop = unsafeAggregate1 "stddev_pop"

2069+ stddevSamp = unsafeAggregate1 "stddev_samp"

2070+ variance = unsafeAggregate1 "variance"

2071+ varPop = unsafeAggregate1 "var_pop"

2072+ varSamp = unsafeAggregate1 "var_samp"

2073+instance Aggregate

2074+ (Expression outer grp commons schemas params from)

2075+ (Expression outer grp commons schemas params from :*: Expression outer grp commons schemas params from)

2076+ (WindowFunction outer grp commons schemas params from) where

2077+ countStar = UnsafeWindowFunction "count(*)"

2078+ count = unsafeWindowFunction1 "count"

2079+ sum_ = unsafeWindowFunction1 "sum"

2080+ arrayAgg = unsafeWindowFunction1 "array_agg"

2081+ jsonAgg = unsafeWindowFunction1 "json_agg"

2082+ jsonbAgg = unsafeWindowFunction1 "jsonb_agg"

2083+ bitAnd = unsafeWindowFunction1 "bit_and"

2084+ bitOr = unsafeWindowFunction1 "bit_or"

2085+ boolAnd = unsafeWindowFunction1 "bool_and"

2086+ boolOr = unsafeWindowFunction1 "bool_or"

2087+ every = unsafeWindowFunction1 "every"

2088+ max_ = unsafeWindowFunction1 "max"

2089+ min_ = unsafeWindowFunction1 "min"

2090+ avg = unsafeWindowFunction1 "avg"

2091+ corr = unsafeWindowFunction2 "corr"

2092+ covarPop = unsafeWindowFunction2 "covar_pop"

2093+ covarSamp = unsafeWindowFunction2 "covar_samp"

2094+ regrAvgX = unsafeWindowFunction2 "regr_avgx"

2095+ regrAvgY = unsafeWindowFunction2 "regr_avgy"

2096+ regrCount = unsafeWindowFunction2 "regr_count"

2097+ regrIntercept = unsafeWindowFunction2 "regr_intercept"

2098+ regrR2 = unsafeWindowFunction2 "regr_r2"

2099+ regrSlope = unsafeWindowFunction2 "regr_slope"

2100+ regrSxx = unsafeWindowFunction2 "regr_sxx"

2101+ regrSxy = unsafeWindowFunction2 "regr_sxy"

2102+ regrSyy = unsafeWindowFunction2 "regr_syy"

2103+ stddev = unsafeWindowFunction1 "stddev"

2104+ stddevPop = unsafeWindowFunction1 "stddev_pop"

2105+ stddevSamp = unsafeWindowFunction1 "stddev_samp"

2106+ variance = unsafeWindowFunction1 "variance"

2107+ varPop = unsafeWindowFunction1 "var_pop"

2108+ varSamp = unsafeWindowFunction1 "var_samp"

2109+

2110+-- | escape hatch to define aggregate functions

2111+unsafeAggregate1

2112+ :: ByteString -- ^ aggregate function

2113+ -> Distinction (Expression outer 'Ungrouped commons schemas params from) xty

2114+ -> Expression outer ('Grouped bys) commons schemas params from yty

2115+unsafeAggregate1 fun x = UnsafeExpression $ mconcat

2116+ [fun, "(", renderSQL x, ")"]

2117+

2118+-- | escape hatch to define aggregate binary functions

2119+unsafeAggregate2

2120+ :: ByteString -- ^ aggregate function

2121+ -> Distinction (Expression outer 'Ungrouped commons schemas params from :*: Expression outer 'Ungrouped commons schemas params from) xty

2122+ -> Expression outer ('Grouped bys) commons schemas params from yty

2123+unsafeAggregate2 fun xx = UnsafeExpression $ mconcat

2124+ [fun, "(", renderSQL xx, ")"]

2125+

2126+-- | A type family that calculates `PGAvg` type of a `PGType`.

2127+type family PGAvg ty where

2128+ PGAvg 'PGint2 = 'PGnumeric

2129+ PGAvg 'PGint4 = 'PGnumeric

2130+ PGAvg 'PGint8 = 'PGnumeric

2131+ PGAvg 'PGnumeric = 'PGnumeric

2132+ PGAvg 'PGfloat4 = 'PGfloat8

2133+ PGAvg 'PGfloat8 = 'PGfloat8

2134+ PGAvg 'PGinterval = 'PGinterval

2135+ PGAvg pg = TypeError

2136+ ('Text "Squeal type error: No average for " ':<>: 'ShowType pg)

2137+

2138+{-----------------------------------------

2139+type expressions

2140+-----------------------------------------}

2141+

2142+-- | `TypeExpression`s are used in `cast`s and

2143+-- `Squeal.PostgreSQL.Definition.createTable` commands.

2144+newtype TypeExpression (schemas :: SchemasType) (ty :: NullityType)

2145+ = UnsafeTypeExpression { renderTypeExpression :: ByteString }

2146+ deriving (GHC.Generic,Show,Eq,Ord,NFData)

2147+instance RenderSQL (TypeExpression schemas ty) where

2148+ renderSQL = renderTypeExpression

2149+

2150+-- | The enum or composite type in a `Typedef` can be expressed by its alias.

2151+typedef

2152+ :: (Has sch schemas schema, Has td schema ('Typedef ty))

2153+ => QualifiedAlias sch td

2154+ -> TypeExpression schemas (nullity ty)

2155+typedef = UnsafeTypeExpression . renderSQL

2156+

2157+-- | The composite type corresponding to a `Table` definition can be expressed

2158+-- by its alias.

2159+typetable

2160+ :: (Has sch schemas schema, Has tab schema ('Table table))

2161+ => QualifiedAlias sch tab

2162+ -> TypeExpression schemas (nullity ('PGcomposite (TableToRow table)))

2163+typetable = UnsafeTypeExpression . renderSQL

2164+

2165+-- | The composite type corresponding to a `View` definition can be expressed

2166+-- by its alias.

2167+typeview

2168+ :: (Has sch schemas schema, Has vw schema ('View view))

2169+ => QualifiedAlias sch vw

2170+ -> TypeExpression schemas (nullity ('PGcomposite view))

2171+typeview = UnsafeTypeExpression . renderSQL

2172+

2173+-- | logical Boolean (true/false)

2174+bool :: TypeExpression schemas (nullity 'PGbool)

2175+bool = UnsafeTypeExpression "bool"

2176+-- | signed two-byte integer

2177+int2, smallint :: TypeExpression schemas (nullity 'PGint2)

2178+int2 = UnsafeTypeExpression "int2"

2179+smallint = UnsafeTypeExpression "smallint"

2180+-- | signed four-byte integer

2181+int4, int, integer :: TypeExpression schemas (nullity 'PGint4)

2182+int4 = UnsafeTypeExpression "int4"

2183+int = UnsafeTypeExpression "int"

2184+integer = UnsafeTypeExpression "integer"

2185+-- | signed eight-byte integer

2186+int8, bigint :: TypeExpression schemas (nullity 'PGint8)

2187+int8 = UnsafeTypeExpression "int8"

2188+bigint = UnsafeTypeExpression "bigint"

2189+-- | arbitrary precision numeric type

2190+numeric :: TypeExpression schemas (nullity 'PGnumeric)

2191+numeric = UnsafeTypeExpression "numeric"

2192+-- | single precision floating-point number (4 bytes)

2193+float4, real :: TypeExpression schemas (nullity 'PGfloat4)

2194+float4 = UnsafeTypeExpression "float4"

2195+real = UnsafeTypeExpression "real"

2196+-- | double precision floating-point number (8 bytes)

2197+float8, doublePrecision :: TypeExpression schemas (nullity 'PGfloat8)

2198+float8 = UnsafeTypeExpression "float8"

2199+doublePrecision = UnsafeTypeExpression "double precision"

2200+-- | currency amount

2201+money :: TypeExpression schema (nullity 'PGmoney)

2202+money = UnsafeTypeExpression "money"

2203+-- | variable-length character string

2204+text :: TypeExpression schemas (nullity 'PGtext)

2205+text = UnsafeTypeExpression "text"

2206+-- | fixed-length character string

2207+char, character

2208+ :: forall n schemas nullity. (KnownNat n, 1 <= n)

2209+ => TypeExpression schemas (nullity ('PGchar n))

2210+char = UnsafeTypeExpression $ "char(" <> renderNat @n <> ")"

2211+character = UnsafeTypeExpression $ "character(" <> renderNat @n <> ")"

2212+-- | variable-length character string

2213+varchar, characterVarying

2214+ :: forall n schemas nullity. (KnownNat n, 1 <= n)

2215+ => TypeExpression schemas (nullity ('PGvarchar n))

2216+varchar = UnsafeTypeExpression $ "varchar(" <> renderNat @n <> ")"

2217+characterVarying = UnsafeTypeExpression $

2218+ "character varying(" <> renderNat @n <> ")"

2219+-- | binary data ("byte array")

2220+bytea :: TypeExpression schemas (nullity 'PGbytea)

2221+bytea = UnsafeTypeExpression "bytea"

2222+-- | date and time (no time zone)

2223+timestamp :: TypeExpression schemas (nullity 'PGtimestamp)

2224+timestamp = UnsafeTypeExpression "timestamp"

2225+-- | date and time, including time zone

2226+timestampWithTimeZone :: TypeExpression schemas (nullity 'PGtimestamptz)

2227+timestampWithTimeZone = UnsafeTypeExpression "timestamp with time zone"

2228+-- | calendar date (year, month, day)

2229+date :: TypeExpression schemas (nullity 'PGdate)

2230+date = UnsafeTypeExpression "date"

2231+-- | time of day (no time zone)

2232+time :: TypeExpression schemas (nullity 'PGtime)

2233+time = UnsafeTypeExpression "time"

2234+-- | time of day, including time zone

2235+timeWithTimeZone :: TypeExpression schemas (nullity 'PGtimetz)

2236+timeWithTimeZone = UnsafeTypeExpression "time with time zone"

2237+-- | time span

2238+interval :: TypeExpression schemas (nullity 'PGinterval)

2239+interval = UnsafeTypeExpression "interval"

2240+-- | universally unique identifier

2241+uuid :: TypeExpression schemas (nullity 'PGuuid)

2242+uuid = UnsafeTypeExpression "uuid"

2243+-- | IPv4 or IPv6 host address

2244+inet :: TypeExpression schemas (nullity 'PGinet)

2245+inet = UnsafeTypeExpression "inet"

2246+-- | textual JSON data

2247+json :: TypeExpression schemas (nullity 'PGjson)

2248+json = UnsafeTypeExpression "json"

2249+-- | binary JSON data, decomposed

2250+jsonb :: TypeExpression schemas (nullity 'PGjsonb)

2251+jsonb = UnsafeTypeExpression "jsonb"

2252+-- | variable length array

2253+vararray

2254+ :: TypeExpression schemas pg

2255+ -> TypeExpression schemas (nullity ('PGvararray pg))

2256+vararray ty = UnsafeTypeExpression $ renderSQL ty <> "[]"

2257+-- | fixed length array

2258+--

2259+-- >>> renderSQL (fixarray @'[2] json)

2260+-- "json[2]"

2261+fixarray

2262+ :: forall dims schemas nullity pg. SOP.All KnownNat dims

2263+ => TypeExpression schemas pg

2264+ -> TypeExpression schemas (nullity ('PGfixarray dims pg))

2265+fixarray ty = UnsafeTypeExpression $

2266+ renderSQL ty <> renderDims @dims

2267+ where

2268+ renderDims :: forall ns. SOP.All KnownNat ns => ByteString

2269+ renderDims =

2270+ ("[" <>)

2271+ . (<> "]")

2272+ . ByteString.intercalate "]["

2273+ . hcollapse

2274+ $ hcmap (SOP.Proxy @KnownNat)

2275+ (K . fromString . show . natVal)

2276+ (hpure SOP.Proxy :: NP SOP.Proxy ns)

2277+tsvector :: TypeExpression schemas (nullity 'PGtsvector)

2278+tsvector = UnsafeTypeExpression "tsvector"

2279+tsquery :: TypeExpression schemas (nullity 'PGtsquery)

2280+tsquery = UnsafeTypeExpression "tsquery"

2281+

2282+-- | `pgtype` is a demoted version of a `PGType`

2283+class PGTyped schemas (ty :: NullityType) where

2284+ pgtype :: TypeExpression schemas ty

2285+instance PGTyped schemas (nullity 'PGbool) where pgtype = bool

2286+instance PGTyped schemas (nullity 'PGint2) where pgtype = int2

2287+instance PGTyped schemas (nullity 'PGint4) where pgtype = int4

2288+instance PGTyped schemas (nullity 'PGint8) where pgtype = int8

2289+instance PGTyped schemas (nullity 'PGnumeric) where pgtype = numeric

2290+instance PGTyped schemas (nullity 'PGfloat4) where pgtype = float4

2291+instance PGTyped schemas (nullity 'PGfloat8) where pgtype = float8

2292+instance PGTyped schemas (nullity 'PGmoney) where pgtype = money

2293+instance PGTyped schemas (nullity 'PGtext) where pgtype = text

2294+instance (KnownNat n, 1 <= n)

2295+ => PGTyped schemas (nullity ('PGchar n)) where pgtype = char @n

2296+instance (KnownNat n, 1 <= n)

2297+ => PGTyped schemas (nullity ('PGvarchar n)) where pgtype = varchar @n

2298+instance PGTyped schemas (nullity 'PGbytea) where pgtype = bytea

2299+instance PGTyped schemas (nullity 'PGtimestamp) where pgtype = timestamp

2300+instance PGTyped schemas (nullity 'PGtimestamptz) where pgtype = timestampWithTimeZone

2301+instance PGTyped schemas (nullity 'PGdate) where pgtype = date

2302+instance PGTyped schemas (nullity 'PGtime) where pgtype = time

2303+instance PGTyped schemas (nullity 'PGtimetz) where pgtype = timeWithTimeZone

2304+instance PGTyped schemas (nullity 'PGinterval) where pgtype = interval

2305+instance PGTyped schemas (nullity 'PGuuid) where pgtype = uuid

2306+instance PGTyped schemas (nullity 'PGjson) where pgtype = json

2307+instance PGTyped schemas (nullity 'PGjsonb) where pgtype = jsonb

2308+instance PGTyped schemas ty

2309+ => PGTyped schemas (nullity ('PGvararray ty)) where

2310+ pgtype = vararray (pgtype @schemas @ty)

2311+instance (SOP.All KnownNat dims, PGTyped schemas ty)

2312+ => PGTyped schemas (nullity ('PGfixarray dims ty)) where

2313+ pgtype = fixarray @dims (pgtype @schemas @ty)

2314+instance PGTyped schemas (nullity 'PGtsvector) where pgtype = tsvector

2315+instance PGTyped schemas (nullity 'PGtsquery) where pgtype = tsquery

2316+

2317+{-----------------------------------------

2318+Sorting

2319+-----------------------------------------}

2320+

2321+-- | `SortExpression`s are used by `orderBy` to optionally sort the results

2322+-- of a `Squeal.PostgreSQL.Query.Query`. `Asc` or `Desc`

2323+-- set the sort direction of a `NotNull` result

2324+-- column to ascending or descending. Ascending order puts smaller values

2325+-- first, where "smaller" is defined in terms of the `.<` operator. Similarly,

2326+-- descending order is determined with the `.>` operator. `AscNullsFirst`,

2327+-- `AscNullsLast`, `DescNullsFirst` and `DescNullsLast` options are used to

2328+-- determine whether nulls appear before or after non-null values in the sort

2329+-- ordering of a `Null` result column.

2330+data SortExpression outer grp commons schemas params from where

2331+ Asc

2332+ :: Expression outer grp commons schemas params from ('NotNull ty)

2333+ -> SortExpression outer grp commons schemas params from

2334+ Desc

2335+ :: Expression outer grp commons schemas params from ('NotNull ty)

2336+ -> SortExpression outer grp commons schemas params from

2337+ AscNullsFirst

2338+ :: Expression outer grp commons schemas params from ('Null ty)

2339+ -> SortExpression outer grp commons schemas params from

2340+ AscNullsLast

2341+ :: Expression outer grp commons schemas params from ('Null ty)

2342+ -> SortExpression outer grp commons schemas params from

2343+ DescNullsFirst

2344+ :: Expression outer grp commons schemas params from ('Null ty)

2345+ -> SortExpression outer grp commons schemas params from

2346+ DescNullsLast

2347+ :: Expression outer grp commons schemas params from ('Null ty)

2348+ -> SortExpression outer grp commons schemas params from

2349+deriving instance Show (SortExpression outer grp commons schemas params from)

2350+

2351+{- |

2352+The `orderBy` clause causes the result rows of a `Squeal.PostgreSQL.Query.TableExpression`

2353+to be sorted according to the specified `SortExpression`(s).

2354+If two rows are equal according to the leftmost expression,

2355+they are compared according to the next expression and so on.

2356+If they are equal according to all specified expressions,

2357+they are returned in an implementation-dependent order.

2358+

2359+You can also control the order in which rows are processed by window functions

2360+using `orderBy` within `Squeal.PostgreSQL.Query.Over`.

2361+-}

2362+class OrderBy expr where

2363+ orderBy

2364+ :: [SortExpression outer grp commons schemas params from]

2365+ -> expr outer grp commons schemas params from

2366+ -> expr outer grp commons schemas params from

2367+

2368+-- | Render a `SortExpression`.

2369+instance RenderSQL (SortExpression outer grp commons schemas params from) where

2370+ renderSQL = \case

2371+ Asc expression -> renderSQL expression <+> "ASC"

2372+ Desc expression -> renderSQL expression <+> "DESC"

2373+ AscNullsFirst expression -> renderSQL expression

2374+ <+> "ASC NULLS FIRST"

2375+ DescNullsFirst expression -> renderSQL expression

2376+ <+> "DESC NULLS FIRST"

2377+ AscNullsLast expression -> renderSQL expression <+> "ASC NULLS LAST"

2378+ DescNullsLast expression -> renderSQL expression <+> "DESC NULLS LAST"

2379+

2380+-- | A `WindowDefinition` is a set of table rows that are somehow related

2381+-- to the current row

2382+data WindowDefinition outer grp commons schemas params from where

2383+ WindowDefinition

2384+ :: SListI bys

2385+ => NP (Expression outer grp commons schemas params from) bys

2386+ -> [SortExpression outer grp commons schemas params from]

2387+ -> WindowDefinition outer grp commons schemas params from

2388+

2389+instance OrderBy WindowDefinition where

2390+ orderBy sortsR (WindowDefinition parts sortsL)

2391+ = WindowDefinition parts (sortsL ++ sortsR)

2392+

2393+instance RenderSQL (WindowDefinition outer commons schemas from grp params) where

2394+ renderSQL (WindowDefinition part ord) =

2395+ renderPartitionByClause part <> renderOrderByClause ord

2396+ where

2397+ renderPartitionByClause = \case

2398+ Nil -> ""

2399+ parts -> "PARTITION" <+> "BY" <+> renderCommaSeparated renderExpression parts

2400+ renderOrderByClause = \case

2401+ [] -> ""

2402+ srts -> " ORDER" <+> "BY"

2403+ <+> commaSeparated (renderSQL <$> srts)

2404+

2405+{- |

2406+The `partitionBy` clause within `Squeal.PostgreSQL.Query.Over` divides the rows into groups,

2407+or partitions, that share the same values of the `partitionBy` `Expression`(s).

2408+For each row, the window function is computed across the rows that fall into

2409+the same partition as the current row.

2410+-}

2411+partitionBy

2412+ :: SListI bys

2413+ => NP (Expression outer grp commons schemas params from) bys

2414+ -> WindowDefinition outer grp commons schemas params from

2415+partitionBy bys = WindowDefinition bys []

2416+

2417+{- |

2418+A window function performs a calculation across a set of table rows

2419+that are somehow related to the current row. This is comparable to the type

2420+of calculation that can be done with an aggregate function.

2421+However, window functions do not cause rows to become grouped into a single

2422+output row like non-window aggregate calls would.

2423+Instead, the rows retain their separate identities.

2424+Behind the scenes, the window function is able to access more than

2425+just the current row of the query result.

2426+-}

2427+newtype WindowFunction

2428+ (outer :: FromType)

2429+ (grp :: Grouping)

2430+ (commons :: FromType)

2431+ (schemas :: SchemasType)

2432+ (params :: [NullityType])

2433+ (from :: FromType)

2434+ (ty :: NullityType)

2435+ = UnsafeWindowFunction { renderWindowFunction :: ByteString }

2436+ deriving (GHC.Generic,Show,Eq,Ord,NFData)

2437+

2438+instance RenderSQL (WindowFunction outer grp commons schemas params from ty) where

2439+ renderSQL = renderWindowFunction

2440+

2441+unsafeWindowFunction1

2442+ :: ByteString

2443+ -> Expression outer grp commons schemas params from ty0

2444+ -> WindowFunction outer grp commons schemas params from ty1

2445+unsafeWindowFunction1 fun x

2446+ = UnsafeWindowFunction $ fun <> parenthesized (renderSQL x)

2447+

2448+unsafeWindowFunction2

2449+ :: ByteString

2450+ -> (Expression outer grp commons schemas params from :*: Expression outer grp commons schemas params from) ty0

2451+ -> WindowFunction outer grp commons schemas params from ty1

2452+unsafeWindowFunction2 fun (x :*: x')

2453+ = UnsafeWindowFunction $ fun <> parenthesized (renderSQL x <> ", " <> renderSQL x')

2454+

2455+{- | rank of the current row with gaps; same as `rowNumber` of its first peer

2456+>>> printSQL rank

2457+rank()

2458+-}

2459+rank :: WindowFunction outer grp commons schemas params from ('NotNull 'PGint8)

2460+rank = UnsafeWindowFunction "rank()"

2461+

2462+{- | number of the current row within its partition, counting from 1

2463+>>> printSQL rowNumber

2464+row_number()

2465+-}

2466+rowNumber :: WindowFunction outer grp commons schemas params from ('NotNull 'PGint8)

2467+rowNumber = UnsafeWindowFunction "row_number()"

2468+

2469+{- | rank of the current row without gaps; this function counts peer groups

2470+>>> printSQL denseRank

2471+dense_rank()

2472+-}

2473+denseRank :: WindowFunction outer grp commons schemas params from ('NotNull 'PGint8)

2474+denseRank = UnsafeWindowFunction "dense_rank()"

2475+

2476+{- | relative rank of the current row: (rank - 1) / (total partition rows - 1)

2477+>>> printSQL percentRank

2478+percent_rank()

2479+-}

2480+percentRank :: WindowFunction outer grp commons schemas params from ('NotNull 'PGfloat8)

2481+percentRank = UnsafeWindowFunction "percent_rank()"

2482+

2483+{- | cumulative distribution: (number of partition rows

2484+preceding or peer with current row) / total partition rows

2485+>>> printSQL cumeDist

2486+cume_dist()

2487+-}

2488+cumeDist :: WindowFunction outer grp commons schemas params from ('NotNull 'PGfloat8)

2489+cumeDist = UnsafeWindowFunction "cume_dist()"

2490+

2491+{- | integer ranging from 1 to the argument value,

2492+dividing the partition as equally as possible

2493+-}

2494+ntile

2495+ :: Expression outer grp commons schemas params from ('NotNull 'PGint4)

2496+ -- ^ num buckets

2497+ -> WindowFunction outer grp commons schemas params from ('NotNull 'PGint4)

2498+ntile = unsafeWindowFunction1 "ntile"

2499+

2500+{- | returns value evaluated at the row that is offset rows before the current

2501+row within the partition; if there is no such row, instead return default

2502+(which must be of the same type as value). Both offset and default are

2503+evaluated with respect to the current row.

2504+-}

2505+lag

2506+ :: Expression outer grp commons schemas params from ty

2507+ -- ^ value

2508+ -> Expression outer grp commons schemas params from ('NotNull 'PGint4)

2509+ -- ^ offset

2510+ -> Expression outer grp commons schemas params from ty

2511+ -- ^ default

2512+ -> WindowFunction outer grp commons schemas params from ty

2513+lag value offset def = UnsafeWindowFunction $ "lag"

2514+ <> parenthesized

2515+ (commaSeparated ([renderSQL value, renderSQL offset, renderSQL def]))

2516+

2517+{- | returns value evaluated at the row that is offset rows after the current

2518+row within the partition; if there is no such row, instead return default

2519+(which must be of the same type as value). Both offset and default are

2520+evaluated with respect to the current row.

2521+-}

2522+lead

2523+ :: Expression outer grp commons schemas params from ty

2524+ -- ^ value

2525+ -> Expression outer grp commons schemas params from ('NotNull 'PGint4)

2526+ -- ^ offset

2527+ -> Expression outer grp commons schemas params from ty

2528+ -- ^ default

2529+ -> WindowFunction outer grp commons schemas params from ty

2530+lead value offset def = UnsafeWindowFunction $ "lag"

2531+ <> parenthesized

2532+ (commaSeparated ([renderSQL value, renderSQL offset, renderSQL def]))

2533+

2534+{- | returns value evaluated at the row that is the

2535+first row of the window frame

2536+-}

2537+firstValue

2538+ :: Expression outer grp commons schemas params from ty

2539+ -- ^ value

2540+ -> WindowFunction outer grp commons schemas params from ty

2541+firstValue = unsafeWindowFunction1 "first_value"

2542+

2543+{- | returns value evaluated at the row that is the

2544+last row of the window frame

2545+-}

2546+lastValue

2547+ :: Expression outer grp commons schemas params from ty

2548+ -- ^ value

2549+ -> WindowFunction outer grp commons schemas params from ty

2550+lastValue = unsafeWindowFunction1 "last_value"

2551+

2552+{- | returns value evaluated at the row that is the nth

2553+row of the window frame (counting from 1); null if no such row

2554+-}

2555+nthValue

2556+ :: Expression outer grp commons schemas params from (nullity ty)

2557+ -- ^ value

2558+ -> Expression outer grp commons schemas params from ('NotNull 'PGint4)

2559+ -- ^ nth

2560+ -> WindowFunction outer grp commons schemas params from ('Null ty)

2561+nthValue value nth = UnsafeWindowFunction $ "nth_value"

2562+ <> parenthesized (commaSeparated [renderSQL value, renderSQL nth])

2563+

2564+{-|

2565+Create date from year, month and day fields

2566+

2567+>>> printSQL (makeDate 1984 7 3)

2568+make_date(1984, 7, 3)

2569+-}

2570+makeDate

2571+ :: Expression outer grp commons schemas params from (nullity 'PGint4)

2572+ -- ^ year

2573+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2574+ -- ^ month

2575+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2576+ -- ^ day

2577+ -> Expression outer grp commons schemas params from (nullity 'PGdate)

2578+makeDate y m d = UnsafeExpression $ "make_date" <>

2579+ parenthesized (renderCommaSeparated renderSQL (y :* m :* d :* Nil))

2580+

2581+{-|

2582+Create time from hour, minute and seconds fields

2583+

2584+>>> printSQL (makeTime 8 15 23.5)

2585+make_time(8, 15, 23.5)

2586+-}

2587+makeTime

2588+ :: Expression outer grp commons schemas params from (nullity 'PGint4)

2589+ -- ^ hour

2590+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2591+ -- ^ min

2592+ -> Expression outer grp commons schemas params from (nullity 'PGfloat8)

2593+ -- ^ sec

2594+ -> Expression outer grp commons schemas params from (nullity 'PGtime)

2595+makeTime h m s = UnsafeExpression $ "make_time" <>

2596+ parenthesized (renderCommaSeparated renderSQL (h :* m :* s :* Nil))

2597+

2598+{-|

2599+Create timestamp from year, month, day, hour, minute and seconds fields

2600+

2601+>>> printSQL (makeTimestamp 2013 7 15 8 15 23.5)

2602+make_timestamp(2013, 7, 15, 8, 15, 23.5)

2603+-}

2604+makeTimestamp

2605+ :: Expression outer grp commons schemas params from (nullity 'PGint4)

2606+ -- ^ year

2607+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2608+ -- ^ month

2609+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2610+ -- ^ day

2611+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2612+ -- ^ hour

2613+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2614+ -- ^ min

2615+ -> Expression outer grp commons schemas params from (nullity 'PGfloat8)

2616+ -- ^ sec

2617+ -> Expression outer grp commons schemas params from (nullity 'PGtimestamp)

2618+makeTimestamp y mon d h m s =

2619+ UnsafeExpression $ "make_timestamp" <> parenthesized

2620+ (renderCommaSeparated renderSQL (y :* mon :* d :* h :* m :* s :* Nil))

2621+

2622+{-|

2623+Create timestamp with time zone from

2624+year, month, day, hour, minute and seconds fields;

2625+the current time zone is used

2626+

2627+>>> printSQL (makeTimestamptz 2013 7 15 8 15 23.5)

2628+make_timestamptz(2013, 7, 15, 8, 15, 23.5)

2629+-}

2630+makeTimestamptz

2631+ :: Expression outer grp commons schemas params from (nullity 'PGint4)

2632+ -- ^ year

2633+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2634+ -- ^ month

2635+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2636+ -- ^ day

2637+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2638+ -- ^ hour

2639+ -> Expression outer grp commons schemas params from (nullity 'PGint4)

2640+ -- ^ min

2641+ -> Expression outer grp commons schemas params from (nullity 'PGfloat8)

2642+ -- ^ sec

2643+ -> Expression outer grp commons schemas params from (nullity 'PGtimestamptz)

2644+makeTimestamptz y mon d h m s =

2645+ UnsafeExpression $ "make_timestamptz" <> parenthesized

2646+ (renderCommaSeparated renderSQL (y :* mon :* d :* h :* m :* s :* Nil))

2647+

2648+{-|

2649+Affine space operations on time types.

2650+-}

2651+class TimeOp time diff | time -> diff where

2652+ {-|

2653+ >>> printSQL (makeDate 1984 7 3 !+ 365)

2654+ (make_date(1984, 7, 3) + 365)

2655+ -}

2656+ (!+)

2657+ :: Expression outer grp commons schemas params from (nullity time)

2658+ -> Expression outer grp commons schemas params from (nullity diff)

2659+ -> Expression outer grp commons schemas params from (nullity time)

2660+ (!+) = unsafeBinaryOp "+"

2661+ {-|

2662+ >>> printSQL (365 +! makeDate 1984 7 3)

2663+ (365 + make_date(1984, 7, 3))

2664+ -}

2665+ (+!)

2666+ :: Expression outer grp commons schemas params from (nullity diff)

2667+ -> Expression outer grp commons schemas params from (nullity time)

2668+ -> Expression outer grp commons schemas params from (nullity time)

2669+ (+!) = unsafeBinaryOp "+"

2670+ {-|

2671+ >>> printSQL (makeDate 1984 7 3 !- 365)

2672+ (make_date(1984, 7, 3) - 365)

2673+ -}

2674+ (!-)

2675+ :: Expression outer grp commons schemas params from (nullity time)

2676+ -> Expression outer grp commons schemas params from (nullity diff)

2677+ -> Expression outer grp commons schemas params from (nullity time)

2678+ (!-) = unsafeBinaryOp "-"

2679+ {-|

2680+ >>> printSQL (makeDate 1984 7 3 !-! currentDate)

2681+ (make_date(1984, 7, 3) - CURRENT_DATE)

2682+ -}

2683+ (!-!)

2684+ :: Expression outer grp commons schemas params from (nullity time)

2685+ -> Expression outer grp commons schemas params from (nullity time)

2686+ -> Expression outer grp commons schemas params from (nullity diff)

2687+ (!-!) = unsafeBinaryOp "-"

2688+instance TimeOp 'PGtimestamp 'PGinterval

2689+instance TimeOp 'PGtimestamptz 'PGinterval

2690+instance TimeOp 'PGtime 'PGinterval

2691+instance TimeOp 'PGtimetz 'PGinterval

2692+instance TimeOp 'PGinterval 'PGinterval

2693+instance TimeOp 'PGdate 'PGint4

2694+infixl 6 !+

2695+infixl 6 +!

2696+infixl 6 !-

2697+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.

18 , MultiParamTypeClasses

19 , OverloadedStrings

20 , PatternSynonyms

21− , QuantifiedConstraints

22 , RankNTypes

21 , RankNTypes

23 , ScopedTypeVariables

22 , ScopedTypeVariables

24 , TypeApplications

23 , TypeApplications

@@ -30,9 +29,19 @@ Squeal data manipulation language.

31module Squeal.PostgreSQL.Manipulation

30module Squeal.PostgreSQL.Manipulation

32 ( -- * Manipulation

31 ( -- * Manipulation

33− Manipulation_

32+ Manipulation (..)

34− , Manipulation (..)

33+ , Manipulation_

35 , queryStatement

34 , queryStatement

35+ , QueryClause (..)

36+ , pattern Values_

37+ , DefaultAliasable (..)

38+ , ColumnExpression (..)

39+ , ReturningClause (..)

40+ , pattern Returning_

41+ , ConflictClause (..)

42+ , ConflictTarget (..)

43+ , ConflictAction (..)

44+ , UsingClause (..)

36 -- * Insert

45 -- * Insert

37 , insertInto

46 , insertInto

38 , insertInto_

47 , insertInto_

@@ -42,95 +51,37 @@ module Squeal.PostgreSQL.Manipulation

42 -- * Delete

51 -- * Delete

43 , deleteFrom

52 , deleteFrom

44 , deleteFrom_

53 , deleteFrom_

45− -- * Clauses

54+ , also

46− , Optional (..)

47− , QueryClause (..)

48− , pattern Values_

49− , ReturningClause (..)

50− , pattern Returning_

51− , ConflictClause (..)

52− , ConflictTarget (..)

53− , ConflictAction (..)

54− , UsingClause (..)

55 ) where

57import Control.DeepSeq

58import Data.ByteString hiding (foldr)

59import Data.Kind (Type)

60+import GHC.TypeLits (KnownSymbol)

61import qualified Generics.SOP as SOP

62import qualified Generics.SOP as SOP

62import qualified GHC.Generics as GHC

63import qualified GHC.Generics as GHC

64−import Squeal.PostgreSQL.Alias

65+import Squeal.PostgreSQL.Binary

65import Squeal.PostgreSQL.Expression

66import Squeal.PostgreSQL.Expression

66−import Squeal.PostgreSQL.Expression.Logic

67−import Squeal.PostgreSQL.List

68−import Squeal.PostgreSQL.PG

69import Squeal.PostgreSQL.Render

67import Squeal.PostgreSQL.Render

70import Squeal.PostgreSQL.Query

68import Squeal.PostgreSQL.Query

71import Squeal.PostgreSQL.Schema

69import Squeal.PostgreSQL.Schema

73−-- $setup

74−-- >>> import Squeal.PostgreSQL

75−-- >>> import Data.Int

76−-- >>> import Data.Time

77−

78{- |

71{- |

79A `Manipulation` is a statement which may modify data in the database,

72A `Manipulation` is a statement which may modify data in the database,

80but does not alter its schemas. Examples are inserts, updates and deletes.

73but does not alter its schemas. Examples are inserts, updates and deletes.

81A `Query` is also considered a `Manipulation` even though it does not modify data.

74A `Query` is also considered a `Manipulation` even though it does not modify data.

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−

125simple insert:

76simple insert:

126

127>>> type Columns = '["col1" ::: 'NoDef :=> 'Null 'PGint4, "col2" ::: 'Def :=> 'NotNull 'PGint4]

78>>> type Columns = '["col1" ::: 'NoDef :=> 'Null 'PGint4, "col2" ::: 'Def :=> 'NotNull 'PGint4]

128>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]

79>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]

129>>> :{

80>>> :{

130let

81let

131− manipulation :: Manipulation_ (Public Schema) () ()

82+ manipulation :: Manipulation '[] (Public Schema) '[] '[]

132 manipulation =

83 manipulation =

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

84+ insertInto_ #tab (Values_ (2 `as` #col1 :* defaultAs #col2))

134in printSQL manipulation

85in printSQL manipulation

135:}

86:}

136INSERT INTO "tab" ("col1", "col2") VALUES (2, DEFAULT)

87INSERT INTO "tab" ("col1", "col2") VALUES (2, DEFAULT)

@@ -141,9 +92,9 @@ parameterized insert:

141>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]

92>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]

142>>> :{

93>>> :{

143let

94let

144− manipulation :: Manipulation_ (Public Schema) (Int32, Int32) ()

95+ manipulation :: Manipulation '[] (Public Schema) '[ 'NotNull 'PGint4, 'NotNull 'PGint4 ] '[]

145 manipulation =

96 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))

147in printSQL manipulation

98in printSQL manipulation

148:}

99:}

149INSERT INTO "tab" ("col1", "col2") VALUES (($1 :: int4), ($2 :: int4))

100INSERT INTO "tab" ("col1", "col2") VALUES (($1 :: int4), ($2 :: int4))

@@ -152,9 +103,9 @@ returning insert:

152

103

153>>> :{

104>>> :{

154let

105let

155− manipulation :: Manipulation_ (Public Schema) () (Only Int32)

106+ manipulation :: Manipulation '[] (Public Schema) '[] '["fromOnly" ::: 'NotNull 'PGint4]

156 manipulation =

107 manipulation =

157− insertInto #tab (Values_ (Set 2 `as` #col1 :* Set 3 `as` #col2))

108+ insertInto #tab (Values_ (2 `as` #col1 :* 3 `as` #col2))

158 OnConflictDoRaise (Returning (#col1 `as` #fromOnly))

109 OnConflictDoRaise (Returning (#col1 `as` #fromOnly))

159in printSQL manipulation

110in printSQL manipulation

160:}

111:}

@@ -167,12 +118,12 @@ upsert:

167>>> type CustomersSchema = '["customers" ::: 'Table (CustomersConstraints :=> CustomersColumns)]

118>>> type CustomersSchema = '["customers" ::: 'Table (CustomersConstraints :=> CustomersColumns)]

168>>> :{

119>>> :{

169let

120let

170− manipulation :: Manipulation_ (Public CustomersSchema) () ()

121+ manipulation :: Manipulation '[] (Public CustomersSchema) '[] '[]

171 manipulation =

122 manipulation =

172 insertInto #customers

123 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))

174 (OnConflict (OnConstraint #uq)

125 (OnConflict (OnConstraint #uq)

175− (DoUpdate (Set (#excluded ! #email <> "; " <> #customers ! #email) `as` #email) []))

126+ (DoUpdate (((#excluded ! #email) <> "; " <> (#customers ! #email)) `as` #email) []))

176 (Returning_ Nil)

127 (Returning_ Nil)

177in printSQL manipulation

128in printSQL manipulation

178:}

129:}

@@ -182,7 +133,7 @@ query insert:

182

133

183>>> :{

134>>> :{

184let

135let

185− manipulation :: Manipulation_ (Public Schema) () ()

136+ manipulation :: Manipulation '[] (Public Schema) '[] '[]

186 manipulation = insertInto_ #tab (Subquery (select Star (from (table #tab))))

137 manipulation = insertInto_ #tab (Subquery (select Star (from (table #tab))))

187in printSQL manipulation

138in printSQL manipulation

188:}

139:}

@@ -192,8 +143,8 @@ update:

192

143

193>>> :{

144>>> :{

194let

145let

195− manipulation :: Manipulation_ (Public Schema) () ()

146+ manipulation :: Manipulation '[] (Public Schema) '[] '[]

196− manipulation = update_ #tab (Set 2 `as` #col1) (#col1 ./= #col2)

147+ manipulation = update_ #tab (2 `as` #col1) (#col1 ./= #col2)

197in printSQL manipulation

148in printSQL manipulation

198:}

149:}

199UPDATE "tab" SET "col1" = 2 WHERE ("col1" <> "col2")

150UPDATE "tab" SET "col1" = 2 WHERE ("col1" <> "col2")

@@ -202,7 +153,9 @@ delete:

202

153

203>>> :{

154>>> :{

204let

155let

205− manipulation :: Manipulation_ (Public Schema) () (Row Int32 Int32)

156+ manipulation :: Manipulation '[] (Public Schema) '[]

157+ '[ "col1" ::: 'NotNull 'PGint4

158+ , "col2" ::: 'NotNull 'PGint4 ]

206 manipulation = deleteFrom #tab NoUsing (#col1 .== #col2) (Returning Star)

159 manipulation = deleteFrom #tab NoUsing (#col1 .== #col2) (Returning Star)

207in printSQL manipulation

160in printSQL manipulation

208:}

161:}

@@ -213,13 +166,13 @@ delete and using clause:

213>>> :{

166>>> :{

214type Schema3 =

167type Schema3 =

215 '[ "tab" ::: 'Table ('[] :=> Columns)

168 '[ "tab" ::: 'Table ('[] :=> Columns)

216− , "other_tab" ::: 'Table ('[] :=> Columns)

169+ , "other_tab" ::: 'Table ('[] :=> Columns)

217− , "third_tab" ::: 'Table ('[] :=> Columns) ]

170+ , "third_tab" ::: 'Table ('[] :=> Columns) ]

218:}

171:}

219

172

220>>> :{

173>>> :{

221let

174let

222− manipulation :: Manipulation_ (Public Schema3) () ()

175+ manipulation :: Manipulation '[] (Public Schema3) '[] '[]

223 manipulation =

176 manipulation =

224 deleteFrom #tab (Using (table #other_tab & also (table #third_tab)))

177 deleteFrom #tab (Using (table #other_tab & also (table #third_tab)))

225 ( (#tab ! #col2 .== #other_tab ! #col2)

178 ( (#tab ! #col2 .== #other_tab ! #col2)

@@ -235,7 +188,7 @@ with manipulation:

235>>> type ProductsSchema = '["products" ::: 'Table ('[] :=> ProductsColumns), "products_deleted" ::: 'Table ('[] :=> ProductsColumns)]

188>>> type ProductsSchema = '["products" ::: 'Table ('[] :=> ProductsColumns), "products_deleted" ::: 'Table ('[] :=> ProductsColumns)]

236>>> :{

189>>> :{

237let

190let

238− manipulation :: Manipulation_ (Public ProductsSchema) (Only Day) ()

191+ manipulation :: Manipulation '[] (Public ProductsSchema) '[ 'NotNull 'PGdate] '[]

239 manipulation = with

192 manipulation = with

240 (deleteFrom #products NoUsing (#date .< param @1) (Returning Star) `as` #del)

193 (deleteFrom #products NoUsing (#date .< param @1) (Returning Star) `as` #del)

241 (insertInto_ #products_deleted (Subquery (select Star (from (common #del)))))

194 (insertInto_ #products_deleted (Subquery (select Star (from (common #del)))))

@@ -243,13 +196,26 @@ in printSQL manipulation

243:}

196:}

244WITH "del" AS (DELETE FROM "products" WHERE ("date" < ($1 :: date)) RETURNING *) INSERT INTO "products_deleted" SELECT * FROM "del" AS "del"

197WITH "del" AS (DELETE FROM "products" WHERE ("date" < ($1 :: date)) RETURNING *) INSERT INTO "products_deleted" SELECT * FROM "del" AS "del"

245-}

198-}

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+

246type family Manipulation_ (schemas :: SchemasType) (params :: Type) (row :: Type) where

213type family Manipulation_ (schemas :: SchemasType) (params :: Type) (row :: Type) where

247 Manipulation_ schemas params row = Manipulation '[] schemas (TuplePG params) (RowPG row)

214 Manipulation_ schemas params row = Manipulation '[] schemas (TuplePG params) (RowPG row)

248

215

249-- | Convert a `Query` into a `Manipulation`.

216-- | Convert a `Query` into a `Manipulation`.

250queryStatement

217queryStatement

251 :: Query '[] commons schemas params columns

218 :: Query '[] commons schemas params columns

252− -- ^ `Query` to embed as a `Manipulation`

253 -> Manipulation commons schemas params columns

219 -> Manipulation commons schemas params columns

254queryStatement q = UnsafeManipulation $ renderSQL q

220queryStatement q = UnsafeManipulation $ renderSQL q

255

221

@@ -272,13 +238,9 @@ insertInto

272 , SOP.SListI columns

238 , SOP.SListI columns

273 , SOP.SListI row1 )

239 , SOP.SListI row1 )

274 => QualifiedAlias sch tab

240 => QualifiedAlias sch tab

275− -- ^ table

276 -> QueryClause commons schemas params columns

241 -> QueryClause commons schemas params columns

277− -- ^ what to insert

278 -> ConflictClause tab commons schemas params table

242 -> ConflictClause tab commons schemas params table

279− -- ^ what to do in case of conflict

280 -> ReturningClause commons schemas params '[tab ::: row0] row1

243 -> ReturningClause commons schemas params '[tab ::: row0] row1

281− -- ^ what to return

282 -> Manipulation commons schemas params row1

244 -> Manipulation commons schemas params row1

283insertInto tab qry conflict ret = UnsafeManipulation $

245insertInto tab qry conflict ret = UnsafeManipulation $

284 "INSERT" <+> "INTO" <+> renderSQL tab

246 "INSERT" <+> "INTO" <+> renderSQL tab

@@ -286,7 +248,6 @@ insertInto tab qry conflict ret = UnsafeManipulation $

286 <> renderSQL conflict

248 <> renderSQL conflict

287 <> renderSQL ret

249 <> renderSQL ret

288

250

289−-- | Like `insertInto` but with `OnConflictDoRaise` and `no` `ReturningClause`.

290insertInto_

251insertInto_

291 :: ( Has sch schemas schema

252 :: ( Has sch schemas schema

292 , Has tab schema ('Table table)

253 , Has tab schema ('Table table)

@@ -294,33 +255,25 @@ insertInto_

294 , row ~ TableToRow table

255 , row ~ TableToRow table

295 , SOP.SListI columns )

256 , SOP.SListI columns )

296 => QualifiedAlias sch tab

257 => QualifiedAlias sch tab

297− -- ^ table

298 -> QueryClause commons schemas params columns

258 -> QueryClause commons schemas params columns

299− -- ^ what to insert

300 -> Manipulation commons schemas params '[]

259 -> Manipulation commons schemas params '[]

301insertInto_ tab qry =

260insertInto_ tab qry =

302 insertInto tab qry OnConflictDoRaise (Returning_ Nil)

261 insertInto tab qry OnConflictDoRaise (Returning_ Nil)

303

262

304−-- | A `QueryClause` describes what to `insertInto` a table.

305data QueryClause commons schemas params columns where

263data QueryClause commons schemas params columns where

306 Values

264 Values

307 :: SOP.SListI columns

265 :: SOP.SListI columns

308− => NP (Aliased (Optional (Expression '[] commons 'Ungrouped schemas params '[]))) columns

266+ => NP (ColumnExpression 'Ungrouped schemas params '[]) columns

309− -- ^ row of values

310− -> [NP (Aliased (Optional (Expression '[] commons 'Ungrouped schemas params '[]))) columns]

267+ -> [NP (ColumnExpression 'Ungrouped schemas params '[]) columns]

311− -- ^ additional rows of values

312 -> QueryClause commons schemas params columns

268 -> QueryClause commons schemas params columns

313 Select

269 Select

314 :: SOP.SListI columns

270 :: SOP.SListI columns

315− => NP (Aliased (Optional (Expression '[] commons grp schemas params from))) columns

271+ => NP (ColumnExpression grp schemas params from) columns

316− -- ^ row of values

317− -> TableExpression '[] commons grp schemas params from

272+ -> TableExpression '[] grp commons schemas params from

318− -- ^ from a table expression

319 -> QueryClause commons schemas params columns

273 -> QueryClause commons schemas params columns

320 Subquery

274 Subquery

321 :: ColumnsToRow columns ~ row

275 :: ColumnsToRow columns ~ row

322 => Query '[] commons schemas params row

276 => Query '[] commons schemas params row

323− -- ^ subquery to insert

324 -> QueryClause commons schemas params columns

277 -> QueryClause commons schemas params columns

325

278

326instance RenderSQL (QueryClause commons schemas params columns) where

279instance RenderSQL (QueryClause commons schemas params columns) where

@@ -339,41 +292,109 @@ instance RenderSQL (QueryClause commons schemas params columns) where

339 Subquery qry -> renderQuery qry

292 Subquery qry -> renderQuery qry

340 where

293 where

341 renderSQLPartMaybe, renderValuePartMaybe

294 renderSQLPartMaybe, renderValuePartMaybe

342− :: Aliased (Optional (Expression '[] commons grp schemas params from)) column

295+ :: ColumnExpression grp schemas params from column -> Maybe ByteString

343− -> Maybe ByteString

344 renderSQLPartMaybe = \case

296 renderSQLPartMaybe = \case

345− Default `As` _ -> Nothing

297+ DefaultAs _ -> Nothing

346− Set _ `As` name -> Just $ renderSQL name

298+ Specific (_ `As` name) -> Just $ renderSQL name

347 renderValuePartMaybe = \case

299 renderValuePartMaybe = \case

348− Default `As` _ -> Nothing

300+ DefaultAs _ -> Nothing

349− Set value `As` _ -> Just $ renderExpression value

301+ Specific (value `As` _) -> Just $ renderExpression value

350 renderSQLPart, renderValuePart

302 renderSQLPart, renderValuePart

351− :: Aliased (Optional (Expression '[] commons grp schemas params from)) column

303+ :: ColumnExpression grp schemas params from column -> ByteString

352− -> ByteString

304+ renderSQLPart = \case

305+ DefaultAs name -> renderSQL name

353− renderSQLPart (_ `As` name) = renderSQL name

306+ Specific (_ `As` name) -> renderSQL name

354− renderValuePart (value `As` _) = renderSQL value

307+ renderValuePart = \case

308+ DefaultAs _ -> "DEFAULT"

309+ Specific (value `As` _) -> renderExpression value

355

310

356−-- | `Values_` describes a single `NP` list of `Aliased` `Optional` `Expression`s

357−-- whose `ColumnsType` must match the tables'.

358pattern Values_

311pattern Values_

359 :: SOP.SListI columns

312 :: SOP.SListI columns

360− => NP (Aliased (Optional (Expression '[] commons 'Ungrouped schemas params '[]))) columns

313+ => NP (ColumnExpression 'Ungrouped schemas params '[]) columns

361− -- ^ row of values

362 -> QueryClause commons schemas params columns

314 -> QueryClause commons schemas params columns

363pattern Values_ vals = Values vals []

315pattern Values_ vals = Values vals []

364

316

365−-- | `Optional` is either `Default` or a value, parameterized by an appropriate

317+data ColumnExpression grp schemas params from column where

366−-- `ColumnConstraint`.

318+ DefaultAs

367−data Optional expr ty where

319+ :: KnownSymbol col

368− -- | Use the `Default` value for a column.

320+ => Alias col

369− Default :: Optional expr ('Def :=> ty)

321+ -> ColumnExpression grp schemas params from (col ::: 'Def :=> ty)

370− -- | `Set` a value for a column.

322+ Specific

371− Set :: expr ty -> Optional expr (def :=> ty)

323+ :: Aliased (Expression '[] grp '[] schemas params from) (col ::: ty)

372−

324+ -> ColumnExpression grp schemas params from (col ::: defness :=> ty)

373−instance (forall x. RenderSQL (expr x)) => RenderSQL (Optional expr ty) where

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

374 renderSQL = \case

393 renderSQL = \case

394+ DefaultAs col ->

375− Default -> "DEFAULT"

395+ renderSQL col <+> "=" <+> "DEFAULT"

376− Set expr -> renderSQL expr

396+ Specific (expression `As` col) ->

397+ renderSQL col <+> "=" <+> renderSQL expression

377

398

378-- | A `ReturningClause` computes and return value(s) based

399-- | A `ReturningClause` computes and return value(s) based

379-- on each row actually inserted, updated or deleted. This is primarily

400-- 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

383-- deleted will be returned. For example, if a row was locked

404-- deleted will be returned. For example, if a row was locked

384-- but not updated because an `OnConflict` `DoUpdate` condition was not satisfied,

405-- but not updated because an `OnConflict` `DoUpdate` condition was not satisfied,

385-- the row will not be returned. `Returning` `Star` will return all columns

406-- 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

387-- values are desired.

408-- values are desired.

388newtype ReturningClause commons schemas params from row =

409newtype ReturningClause commons schemas params from row =

389− Returning (Selection '[] commons 'Ungrouped schemas params from row)

410+ Returning (Selection '[] 'Ungrouped commons schemas params from row)

390

411

391instance RenderSQL (ReturningClause commons schemas params from row) where

412instance RenderSQL (ReturningClause commons schemas params from row) where

392 renderSQL = \case

413 renderSQL = \case

393 Returning (List Nil) -> ""

414 Returning (List Nil) -> ""

394 Returning selection -> " RETURNING" <+> renderSQL selection

415 Returning selection -> " RETURNING" <+> renderSQL selection

395

416

396−-- | `Returning` a `List`

397pattern Returning_

417pattern Returning_

398 :: SOP.SListI row

418 :: SOP.SListI row

399− => NP (Aliased (Expression '[] commons 'Ungrouped schemas params from)) row

419+ => NP (Aliased (Expression '[] 'Ungrouped commons schemas params from)) row

400− -- ^ row of values

401 -> ReturningClause commons schemas params from row

420 -> ReturningClause commons schemas params from row

402pattern Returning_ list = Returning (List list)

421pattern Returning_ list = Returning (List list)

403

422

@@ -410,9 +429,7 @@ data ConflictClause tab commons schemas params table where

410 OnConflictDoRaise :: ConflictClause tab commons schemas params table

429 OnConflictDoRaise :: ConflictClause tab commons schemas params table

411 OnConflict

430 OnConflict

412 :: ConflictTarget constraints

431 :: ConflictTarget constraints

413− -- ^ conflict target

414 -> ConflictAction tab commons schemas params columns

432 -> ConflictAction tab commons schemas params columns

415− -- ^ conflict action

416 -> ConflictClause tab commons schemas params (constraints :=> columns)

433 -> ConflictClause tab commons schemas params (constraints :=> columns)

417

434

418-- | Render a `ConflictClause`.

435-- | Render a `ConflictClause`.

@@ -423,17 +440,6 @@ instance SOP.SListI (TableToColumns table)

423 OnConflict target action -> " ON CONFLICT"

440 OnConflict target action -> " ON CONFLICT"

424 <+> renderSQL target <+> renderSQL action

441 <+> renderSQL target <+> renderSQL action

425

442

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−-}

437data ConflictAction tab commons schemas params columns where

443data ConflictAction tab commons schemas params columns where

438 DoNothing :: ConflictAction tab commons schemas params columns

444 DoNothing :: ConflictAction tab commons schemas params columns

439 DoUpdate

445 DoUpdate

@@ -442,9 +448,8 @@ data ConflictAction tab commons schemas params columns where

442 , columns ~ (col0 ': cols)

448 , columns ~ (col0 ': cols)

443 , SOP.All (HasIn columns) subcolumns

449 , SOP.All (HasIn columns) subcolumns

444 , AllUnique subcolumns )

450 , AllUnique subcolumns )

445− => NP (Aliased (Optional (Expression '[] commons 'Ungrouped schemas params '[tab ::: row, "excluded" ::: row]))) subcolumns

451+ => NP (ColumnExpression 'Ungrouped schemas params '[tab ::: row, "excluded" ::: row]) subcolumns

446− -> [Condition '[] commons 'Ungrouped schemas params '[tab ::: row, "excluded" ::: row]]

452+ -> [Condition '[] 'Ungrouped commons schemas params '[tab ::: row, "excluded" ::: row]]

447− -- ^ WHERE `Condition`s

448 -> ConflictAction tab commons schemas params columns

453 -> ConflictAction tab commons schemas params columns

449

454

450instance RenderSQL (ConflictAction tab commons schemas params columns) where

455instance RenderSQL (ConflictAction tab commons schemas params columns) where

@@ -452,17 +457,11 @@ instance RenderSQL (ConflictAction tab commons schemas params columns) where

452 DoNothing -> "DO NOTHING"

457 DoNothing -> "DO NOTHING"

453 DoUpdate updates whs'

458 DoUpdate updates whs'

454 -> "DO UPDATE SET"

459 -> "DO UPDATE SET"

455− <+> renderCommaSeparated renderUpdate updates

460+ <+> renderCommaSeparated renderSQL updates

456 <> case whs' of

461 <> case whs' of

457 [] -> ""

462 [] -> ""

458 wh:whs -> " WHERE" <+> renderSQL (foldr (.&&) wh whs)

463 wh:whs -> " WHERE" <+> renderSQL (foldr (.&&) wh whs)

459

464

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−

466-- | A `ConflictTarget` specifies the constraint violation that triggers a

465-- | A `ConflictTarget` specifies the constraint violation that triggers a

467-- `ConflictAction`.

466-- `ConflictAction`.

468data ConflictTarget constraints where

467data ConflictTarget constraints where

@@ -485,6 +484,7 @@ UPDATE statements

485update

484update

486 :: ( SOP.SListI columns

485 :: ( SOP.SListI columns

487 , SOP.SListI row1

486 , SOP.SListI row1

487+ , db ~ (commons :=> schemas)

488 , Has sch schemas schema

489 , Has tab schema ('Table table)

490 , row0 ~ TableToRow table

@@ -492,9 +492,9 @@ update

492 , SOP.All (HasIn columns) subcolumns

493 , AllUnique subcolumns )

494 => 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

496 -- ^ modified values to replace old values

497− -> Condition '[] commons 'Ungrouped schemas params '[tab ::: row0]

497+ -> Condition '[] 'Ungrouped commons schemas params '[tab ::: row0]

498 -- ^ condition under which to perform update on a row

499 -> ReturningClause commons schemas params '[tab ::: row0] row1 -- ^ results to return

500 -> Manipulation commons schemas params row1

@@ -502,13 +502,14 @@ update tab columns wh returning = UnsafeManipulation $

502 "UPDATE"

503 <+> renderSQL tab

504 <+> "SET"

505− <+> renderCommaSeparated renderUpdate columns

505+ <+> renderCommaSeparated renderSQL columns

506 <+> "WHERE" <+> renderSQL wh

507 <> renderSQL returning

508

509-- | Update a row returning `Nil`.

510update_

511 :: ( SOP.SListI columns

512+ , db ~ (commons :=> schemas)

512 , Has sch schemas schema

513 , Has sch schemas schema

513 , Has tab schema ('Table table)

514 , Has tab schema ('Table table)

514 , row ~ TableToRow table

515 , row ~ TableToRow table

@@ -516,9 +517,9 @@ update_

516 , SOP.All (HasIn columns) subcolumns

517 , SOP.All (HasIn columns) subcolumns

517 , AllUnique subcolumns )

518 , AllUnique subcolumns )

518 => QualifiedAlias sch tab -- ^ table to update

519 => 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

520 -- ^ modified values to replace old values

521 -- ^ modified values to replace old values

521− -> Condition '[] commons 'Ungrouped schemas params '[tab ::: row]

522+ -> Condition '[] 'Ungrouped commons schemas params '[tab ::: row]

522 -- ^ condition under which to perform update on a row

523 -- ^ condition under which to perform update on a row

523 -> Manipulation commons schemas params '[]

524 -> Manipulation commons schemas params '[]

524update_ tab columns wh = update tab columns wh (Returning_ Nil)

525update_ tab columns wh = update tab columns wh (Returning_ Nil)

@@ -527,32 +528,23 @@ update_ tab columns wh = update tab columns wh (Returning_ Nil)

527DELETE statements

528DELETE statements

528-----------------------------------------}

529-----------------------------------------}

529

530

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.

539data UsingClause commons schemas params from where

531data UsingClause commons schemas params from where

540 NoUsing :: UsingClause commons schemas params '[]

532 NoUsing :: UsingClause commons schemas params '[]

541 Using

533 Using

542 :: FromClause '[] commons schemas params from

534 :: FromClause '[] commons schemas params from

543− -- ^ what to use

544 -> UsingClause commons schemas params from

535 -> UsingClause commons schemas params from

545

536

546-- | Delete rows from a table.

537-- | Delete rows from a table.

547deleteFrom

538deleteFrom

548 :: ( SOP.SListI row1

539 :: ( SOP.SListI row1

540+ , db ~ (commons :=> schemas)

549 , Has sch schemas schema

541 , Has sch schemas schema

550 , Has tab schema ('Table table)

542 , Has tab schema ('Table table)

551 , row0 ~ TableToRow table

543 , row0 ~ TableToRow table

552 , columns ~ TableToColumns table )

544 , columns ~ TableToColumns table )

553 => QualifiedAlias sch tab -- ^ table to delete from

545 => QualifiedAlias sch tab -- ^ table to delete from

554 -> UsingClause commons schemas params from

546 -> UsingClause commons schemas params from

555− -> Condition '[] commons 'Ungrouped schemas params (tab ::: row0 ': from)

547+ -> Condition '[] 'Ungrouped commons schemas params (tab ::: row0 ': from)

556 -- ^ condition under which to delete a row

548 -- ^ condition under which to delete a row

557 -> ReturningClause commons schemas params '[tab ::: row0] row1 -- ^ results to return

549 -> ReturningClause commons schemas params '[tab ::: row0] row1 -- ^ results to return

558 -> Manipulation commons schemas params row1

550 -> Manipulation commons schemas params row1

@@ -567,12 +559,27 @@ deleteFrom tab using wh returning = UnsafeManipulation $

567

559

568-- | Delete rows returning `Nil`.

560-- | Delete rows returning `Nil`.

569deleteFrom_

561deleteFrom_

562+ :: ( db ~ (commons :=> schemas)

570− :: ( Has sch schemas schema

563+ , Has sch schemas schema

571 , Has tab schema ('Table table)

564 , Has tab schema ('Table table)

572 , row ~ TableToRow table

565 , row ~ TableToRow table

573 , columns ~ TableToColumns table )

566 , columns ~ TableToColumns table )

574 => QualifiedAlias sch tab -- ^ table to delete from

567 => QualifiedAlias sch tab -- ^ table to delete from

575− -> Condition '[] commons 'Ungrouped schemas params '[tab ::: row]

568+ -> Condition '[] 'Ungrouped commons schemas params '[tab ::: row]

576 -- ^ condition under which to delete a row

569 -- ^ condition under which to delete a row

577 -> Manipulation commons schemas params '[]

570 -> Manipulation commons schemas params '[]

578deleteFrom_ tab wh = deleteFrom tab NoUsing wh (Returning_ Nil)

571deleteFrom_ 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

8This module defines a `Migration` type to safely

9change the schema of your database over time. Let's see an example!

11−First turn on some extensions.

12−

13>>> :set -XDataKinds -XOverloadedLabels

11>>> :set -XDataKinds -XOverloadedLabels

14>>> :set -XOverloadedStrings -XFlexibleContexts -XTypeOperators

12>>> :set -XOverloadedStrings -XFlexibleContexts -XTypeOperators

15−

16−Next, let's define our `TableType`s.

17−

18>>> :{

13>>> :{

19type UsersTable =

14type UsersTable =

20 '[ "pk_users" ::: 'PrimaryKey '["id"] ] :=>

15 '[ "pk_users" ::: 'PrimaryKey '["id"] ] :=>

@@ -25,7 +20,7 @@ type UsersTable =

26>>> :{

21>>> :{

27type EmailsTable =

22type EmailsTable =

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

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

29 , "fk_user_id" ::: 'ForeignKey '["user_id"] "users" '["id"]

24 , "fk_user_id" ::: 'ForeignKey '["user_id"] "users" '["id"]

30 ] :=>

25 ] :=>

31 '[ "id" ::: 'Def :=> 'NotNull 'PGint4

26 '[ "id" ::: 'Def :=> 'NotNull 'PGint4

@@ -34,293 +29,227 @@ type EmailsTable =

34 ]

29 ]

35:}

30:}

37−Now we can define some `Migration`s to make our tables.

38−

39>>> :{

32>>> :{

40let

33let

41− makeUsers :: Migration Definition (Public '[]) '["public" ::: '["users" ::: 'Table UsersTable]]

34+ makeUsers :: Migration IO (Public '[]) '["public" ::: '["users" ::: 'Table UsersTable]]

42 makeUsers = Migration

35 makeUsers = Migration

43 { name = "make users table"

36 { name = "make users table"

37+ , up = void . define $

44− , up = createTable #users

38+ createTable #users

45 ( serial `as` #id :*

39 ( serial `as` #id :*

46− notNullable text `as` #name )

40+ (text & notNullable) `as` #name )

47 ( primaryKey #id `as` #pk_users )

41 ( primaryKey #id `as` #pk_users )

48− , down = dropTable #users

42+ , down = void . define $ dropTable #users

49 }

43 }

50:}

44:}

52>>> :{

46>>> :{

53let

47let

54− makeEmails :: Migration Definition '["public" ::: '["users" ::: 'Table UsersTable]]

48+ makeEmails :: Migration IO '["public" ::: '["users" ::: 'Table UsersTable]]

55 '["public" ::: '["users" ::: 'Table UsersTable, "emails" ::: 'Table EmailsTable]]

49 '["public" ::: '["users" ::: 'Table UsersTable, "emails" ::: 'Table EmailsTable]]

56 makeEmails = Migration

50 makeEmails = Migration

57 { name = "make emails table"

51 { name = "make emails table"

52+ , up = void . define $

58− , up = createTable #emails

53+ createTable #emails

59 ( serial `as` #id :*

54 ( serial `as` #id :*

60− notNullable int `as` #user_id :*

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

61− nullable text `as` #email )

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

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

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

63 foreignKey #user_id #users #id

58 foreignKey #user_id #users #id

64 OnDeleteCascade OnUpdateCascade `as` #fk_user_id )

59 OnDeleteCascade OnUpdateCascade `as` #fk_user_id )

65− , down = dropTable #emails

60+ , down = void . define $ dropTable #emails

66 }

61 }

67:}

62:}

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.

71>>> let migrations = makeUsers :>> makeEmails :>> Done

66>>> let migrations = makeUsers :>> makeEmails :>> Done

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+:}

75−>>> import Control.Monad.IO.Class

76>>> :{

79>>> :{

77withConnection "host=localhost port=5432 dbname=exampledb" $

80withConnection "host=localhost port=5432 dbname=exampledb" $

78 manipulate (UnsafeManipulation "SET client_min_messages TO WARNING;")

81 manipulate (UnsafeManipulation "SET client_min_messages TO WARNING;")

79 -- suppress notices

82 -- suppress notices

80− & pqThen (liftIO (putStrLn "Migrate"))

81 & pqThen (migrateUp migrations)

83 & pqThen (migrateUp migrations)

82− & pqThen (liftIO (putStrLn "Rollback"))

84+ & pqThen numMigrations

83 & pqThen (migrateDown migrations)

85 & pqThen (migrateDown migrations)

86+ & pqThen numMigrations

84:}

87:}

85−Migrate

88+Row 2

86−Rollback

89+Row 0

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.

122-}

90-}

123

124{-# LANGUAGE

92{-# LANGUAGE

125 DataKinds

93 DataKinds

126− , DeriveGeneric

127− , FlexibleContexts

128− , FlexibleInstances

129 , GADTs

94 , GADTs

130 , LambdaCase

95 , LambdaCase

131− , OverloadedLabels

132− , OverloadedStrings

133 , PolyKinds

96 , PolyKinds

134− , QuantifiedConstraints

97+ , OverloadedLabels

135− , RankNTypes

136 , TypeApplications

98 , TypeApplications

99+ , FlexibleContexts

137 , TypeOperators

100 , TypeOperators

138#-}

101#-}

139

102

140module Squeal.PostgreSQL.Migration

103module Squeal.PostgreSQL.Migration

141 ( -- * Migration

104 ( -- * Migration

142 Migration (..)

105 Migration (..)

143− , Migratory (..)

106+ , migrateUp

144− , Terminally (..)

107+ , migrateDown

145− , terminally

108+ -- * Migration table

146− , pureMigration

147 , MigrationsTable

109 , MigrationsTable

148− , defaultMain

110+ , createMigrations

111+ , insertMigration

112+ , deleteMigration

113+ , selectMigration

149 ) where

114 ) where

150

115

151−import Control.Category

152import Control.Monad

116import Control.Monad

153−import Data.ByteString (ByteString)

117+import Control.Monad.Base

154−import Data.Foldable (traverse_)

118+import Control.Monad.Trans.Control

119+import Generics.SOP (K(..))

155import Data.Function ((&))

120import Data.Function ((&))

156−import Data.List ((\\))

157import Data.Text (Text)

121import Data.Text (Text)

158−import Data.Time (UTCTime)

159−import Prelude hiding ((.), id)

160−import System.Environment

161−import UnliftIO (MonadIO (..))

162

122

163−import qualified Data.Text.IO as Text (putStrLn)

123+import Squeal.PostgreSQL

164−import qualified Generics.SOP as SOP

165−import qualified GHC.Generics as GHC

166

124

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`

125+-- | A `Migration` should contain an inverse pair of

185−-- instructions and a unique `name`.

126+-- `up` and `down` instructions and a unique `name`.

186−data Migration p schemas0 schemas1 = Migration

127+data Migration io schemas0 schemas1 = Migration

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

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

188 -- Each `name` in a `Migration` should be unique.

129 -- Each `name` in a `Migration` should be unique.

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

130+ , up :: PQ schemas0 schemas1 io () -- ^ The `up` instruction of a `Migration`.

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

131+ , down :: PQ schemas1 schemas0 io () -- ^ 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

260 }

132 }

261

133

262−instance Migratory (Terminally PQ IO) where

134+-- | Run `Migration`s by creating the `MigrationsTable`

263−

135+-- if it does not exist and then in a transaction, for each each `Migration`

264− migrateUp migration = unsafePQ . transactionally_ $ do

136+-- query to see if the `Migration` is executed. If not, then

265− define createMigrations

137+-- execute the `Migration` and insert its row in the `MigrationsTable`.

266− upMigrations migration

138+migrateUp

267−

139+ :: MonadBaseControl IO io

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

140+ => AlignedList (Migration io) schemas0 schemas1 -- ^ migrations to run

301− -> PQ MigrationsSchemas MigrationsSchemas IO ()

141+ -> PQ

302− downMigrations = \case

142+ ("migrations" ::: MigrationsSchema ': schemas0)

303− Done -> return ()

143+ ("migrations" ::: MigrationsSchema ': schemas1)

304− step :>> steps -> downMigrations steps >> downMigration step

144+ io ()

305−

145+migrateUp migration =

306− downMigration

146+ define createMigrations

307− :: Migration (Terminally PQ IO) schemas0 schemas1

147+ & pqBind okResult

308− -> PQ MigrationsSchemas MigrationsSchemas IO ()

148+ & pqThen (transactionallySchema_ (upMigrations migration))

309− downMigration step = do

149+ where

310− executed <- queryExecuted step

311− unless (executed == 0) $ do

312− unsafePQ . runTerminally $ down step

313− manipulateParams_ deleteMigration (Only (name step))

314

150

315− queryExecuted

151+ upMigrations

316− :: Migration (Terminally PQ IO) schemas0 schemas1

152+ :: MonadBaseControl IO io

317− -> PQ MigrationsSchemas MigrationsSchemas IO Row

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

318− queryExecuted step = do

185+ queryExecuted step = do

319− result <- runQueryParams selectMigration (Only (name step))

186+ result <- runQueryParams selectMigration (Only (name step))

187+ okResult result

320− ntuples 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

321

206

322−unsafePQ :: (Functor m) => PQ db0 db1 m x -> PQ db0' db1' m x

207+ downMigrations

323−unsafePQ (PQ pq) = PQ $ fmap (SOP.K . SOP.unK) . pq . SOP.K . SOP.unK

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)

324

253

325-- | The `TableType` for a Squeal migration.

254-- | The `TableType` for a Squeal migration.

326type MigrationsTable =

255type MigrationsTable =

@@ -329,120 +258,40 @@ type MigrationsTable =

329 , "executed_at" ::: 'Def :=> 'NotNull 'PGtimestamptz

258 , "executed_at" ::: 'Def :=> 'NotNull 'PGtimestamptz

330 ]

259 ]

331

260

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−

340type MigrationsSchema = '["schema_migrations" ::: 'Table MigrationsTable]

261type MigrationsSchema = '["schema_migrations" ::: 'Table MigrationsTable]

341−type MigrationsSchemas = Public MigrationsSchema

342

262

343-- | Creates a `MigrationsTable` if it does not already exist.

263-- | 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

345createMigrations =

267createMigrations =

268+ createSchemaIfNotExists #migrations >>>

346− createTableIfNotExists #schema_migrations

269+ createTableIfNotExists (#migrations ! #schema_migrations)

347 ( (text & notNullable) `as` #name :*

270 ( (text & notNullable) `as` #name :*

348 (timestampWithTimeZone & notNullable & default_ currentTimestamp)

271 (timestampWithTimeZone & notNullable & default_ currentTimestamp)

349 `as` #executed_at )

272 `as` #executed_at )

350 ( unique #name `as` #migrations_unique_name )

273 ( unique #name `as` #migrations_unique_name )

351

274

352−-- | Inserts a `Migration` into the `MigrationsTable`, returning

275+-- | Inserts a `Migration` into the `MigrationsTable`

353−-- the time at which it was inserted.

354−insertMigration :: Manipulation_ MigrationsSchemas (Only Text) ()

276+insertMigration

277+ :: Has "migrations" schemas MigrationsSchema

278+ => Manipulation '[] schemas '[ 'NotNull 'PGtext] '[]

355−insertMigration = insertInto_ #schema_migrations

279+insertMigration = insertInto_ (#migrations ! #schema_migrations) . Values_ $

356− (Values_ (Set (param @1) `as` #name :* Default `as` #executed_at))

280+ (param @1) `as` #name :* defaultAs #executed_at

357

281

358−-- | Deletes a `Migration` from the `MigrationsTable`, returning

282+-- | Deletes a `Migration` from the `MigrationsTable`

359−-- the time at which it was inserted.

360−deleteMigration :: Manipulation_ MigrationsSchemas (Only Text) ()

283+deleteMigration

284+ :: Has "migrations" schemas MigrationsSchema

285+ => Manipulation '[] schemas '[ 'NotNull 'PGtext ] '[]

361−deleteMigration = deleteFrom_ #schema_migrations (#name .== param @1)

286+deleteMigration = deleteFrom_ (#migrations ! #schema_migrations) (#name .== param @1)

362

287

363-- | Selects a `Migration` from the `MigrationsTable`, returning

288-- | Selects a `Migration` from the `MigrationsTable`, returning

364−-- the time at which it was inserted.

289+-- the time at which it was executed.

365selectMigration

290selectMigration

366− :: Query_ MigrationsSchemas (Only Text) (Only UTCTime)

291+ :: Has "migrations" schemas MigrationsSchema

292+ => Query '[] '[] schemas '[ 'NotNull 'PGtext ]

293+ '[ "executed_at" ::: 'NotNull 'PGtimestamptz ]

367−selectMigration = select_ (#executed_at `as` #fromOnly)

294+selectMigration = select_

295+ (#executed_at `as` #executed_at)

368− $ from (table (#schema_migrations))

296+ ( from (table ((#migrations ! #schema_migrations) `as` #m))

369− & where_ (#name .== param @1)

297+ & 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

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.

24 , FunctionalDependencies

25 , FlexibleContexts

26 , FlexibleInstances

27− , InstanceSigs

28 , OverloadedStrings

27 , OverloadedStrings

29 , RankNTypes

28 , RankNTypes

30 , ScopedTypeVariables

29 , ScopedTypeVariables

@@ -49,6 +48,8 @@ module Squeal.PostgreSQL.PQ

49 , evalPQ

48 , evalPQ

50 , IndexedMonadTransPQ (..)

49 , IndexedMonadTransPQ (..)

51 , MonadPQ (..)

50 , MonadPQ (..)

51+ , PQRun

52+ , pqliftWith

52 -- * Results

53 -- * Results

53 , LibPQ.Result

54 , LibPQ.Result

54 , LibPQ.Row

55 , LibPQ.Row

@@ -64,21 +65,18 @@ module Squeal.PostgreSQL.PQ

64 , resultErrorCode

65 , resultErrorCode

65 -- * Exceptions

66 -- * Exceptions

66 , SquealException (..)

67 , SquealException (..)

67− , PQState (..)

68− , okResult

69 , catchSqueal

68 , catchSqueal

70 , handleSqueal

69 , handleSqueal

71− , trySqueal

72 ) where

70 ) where

74−import Control.Exception (Exception, throw)

72+import Control.Exception.Lifted

73+import Control.Monad.Base

75import Control.Monad.Except

74import Control.Monad.Except

76import Control.Monad.Morph

75import Control.Monad.Morph

77−import UnliftIO (MonadUnliftIO (..), bracket, catch, handle, try)

76+import Control.Monad.Trans.Control

78import Data.ByteString (ByteString)

77import Data.ByteString (ByteString)

79import Data.Foldable

78import Data.Foldable

80import Data.Function ((&))

79import Data.Function ((&))

81−import Data.Functor ((<&>))

82import Data.Kind

80import Data.Kind

83import Data.Text (pack, Text)

81import Data.Text (pack, Text)

84import Data.Traversable

82import Data.Traversable

@@ -87,7 +85,6 @@ import PostgreSQL.Binary.Encoding (encodingBytes)

88import qualified Control.Monad.Fail as Fail

86import qualified Control.Monad.Fail as Fail

89import qualified Database.PostgreSQL.LibPQ as LibPQ

87import qualified Database.PostgreSQL.LibPQ as LibPQ

90−import qualified PostgreSQL.Binary.Encoding as Encoding

92import Squeal.PostgreSQL.Binary

89import Squeal.PostgreSQL.Binary

93import Squeal.PostgreSQL.Definition

90import Squeal.PostgreSQL.Definition

@@ -108,9 +105,6 @@ import qualified Control.Monad.Trans.Writer.Strict as Strict

108import qualified Control.Monad.Trans.RWS.Lazy as Lazy

105import qualified Control.Monad.Trans.RWS.Lazy as Lazy

109import qualified Control.Monad.Trans.RWS.Strict as Strict

106import qualified Control.Monad.Trans.RWS.Strict as Strict

110

107

111−-- $setup

112−-- >>> import Squeal.PostgreSQL

113−

114{- | Makes a new connection to the database server.

108{- | Makes a new connection to the database server.

115

109

116This function opens a new database connection using the parameters taken

110This function opens a new database connection using the parameters taken

@@ -138,19 +132,19 @@ with the wrong schema!

138-}

132-}

139connectdb

133connectdb

140 :: forall schemas io

134 :: forall schemas io

141− . MonadIO io

135+ . MonadBase IO io

142 => ByteString -- ^ conninfo

136 => ByteString -- ^ conninfo

143 -> io (K LibPQ.Connection schemas)

137 -> io (K LibPQ.Connection schemas)

144−connectdb = fmap K . liftIO . LibPQ.connectdb

138+connectdb = fmap K . liftBase . LibPQ.connectdb

145

139

146-- | Closes the connection to the server.

140-- | Closes the connection to the server.

147−finish :: MonadIO io => K LibPQ.Connection schemas -> io ()

141+finish :: MonadBase IO io => K LibPQ.Connection schemas -> io ()

148−finish = liftIO . LibPQ.finish . unK

142+finish = liftBase . LibPQ.finish . unK

149

143

150-- | Do `connectdb` and `finish` before and after a computation.

144-- | Do `connectdb` and `finish` before and after a computation.

151withConnection

145withConnection

152 :: forall schemas0 schemas1 io x

146 :: forall schemas0 schemas1 io x

153− . MonadUnliftIO io

147+ . MonadBaseControl IO io

154 => ByteString

148 => ByteString

155 -> PQ schemas0 schemas1 io x

149 -> PQ schemas0 schemas1 io x

156 -> io x

150 -> io x

@@ -208,7 +202,8 @@ evalPQ (PQ pq) conn = unK <$> pq conn

208-- [enriched category](https://ncatlab.org/nlab/show/enriched+category).

202-- [enriched category](https://ncatlab.org/nlab/show/enriched+category).

209-- An indexed monad transformer transforms a `Monad` into an indexed monad.

203-- An indexed monad transformer transforms a `Monad` into an indexed monad.

210-- And, `IndexedMonadTransPQ` is a class for indexed monad transformers that

204-- 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`.

212class IndexedMonadTransPQ pq where

207class IndexedMonadTransPQ pq where

213

208

214 -- | indexed analog of `<*>`

209 -- | indexed analog of `<*>`

@@ -248,16 +243,19 @@ class IndexedMonadTransPQ pq where

248 -> x -> pq schemas0 schemas2 m z

243 -> x -> pq schemas0 schemas2 m z

249 pqAndThen g f x = pqBind g (f x)

244 pqAndThen g f x = pqBind g (f x)

250

245

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+

251− -- | Run a `Definition` with `LibPQ.exec`.

252+ -- | Run a `Definition` with `LibPQ.exec`, we expect that libpq obeys the law

252− --

253− -- It should be functorial in effect.

254 --

253 --

255− -- @define id = return ()@

256− -- @define (statement1 >>> statement2) = define statement1 & pqThen (define statement2)@

254+ -- @define statement1 & pqThen (define statement2) = define (statement1 >>> statement2)@

257 define

255 define

258− :: MonadIO io

256+ :: MonadBase IO io

259 => Definition schemas0 schemas1

257 => Definition schemas0 schemas1

260− -> pq schemas0 schemas1 io ()

258+ -> pq schemas0 schemas1 io (K LibPQ.Result '[])

261

259

262instance IndexedMonadTransPQ PQ where

260instance IndexedMonadTransPQ PQ where

263

261

@@ -270,12 +268,16 @@ instance IndexedMonadTransPQ PQ where

270 K x' <- x conn

268 K x' <- x conn

271 unPQ (f x') (K (unK conn))

269 unPQ (f x') (K (unK conn))

272

270

271+ pqEmbed (PQ pq) = PQ $ \ (K conn) -> do

272+ K x <- pq (K conn)

273+ return $ K x

274+

273 define (UnsafeDefinition q) = PQ $ \ (K conn) -> do

275 define (UnsafeDefinition q) = PQ $ \ (K conn) -> do

274− resultMaybe <- liftIO $ LibPQ.exec conn q

276+ resultMaybe <- liftBase $ LibPQ.exec conn q

275 case resultMaybe of

277 case resultMaybe of

276 Nothing -> throw $ ResultException

278 Nothing -> throw $ ResultException

277 "define: LibPQ.exec returned no results"

279 "define: LibPQ.exec returned no results"

278− Just result -> K <$> okResult_ result

280+ Just result -> return $ K (K result)

279

281

280{- | `MonadPQ` is an @mtl@ style constraint, similar to

282{- | `MonadPQ` is an @mtl@ style constraint, similar to

281`Control.Monad.State.Class.MonadState`, for using `Database.PostgreSQL.LibPQ` to

283`Control.Monad.State.Class.MonadState`, for using `Database.PostgreSQL.LibPQ` to

@@ -284,12 +286,8 @@ instance IndexedMonadTransPQ PQ where

284 with a `ToParams` constraint. It calls `LibPQ.execParams` and

286 with a `ToParams` constraint. It calls `LibPQ.execParams` and

285 doesn't afraid of anything.

287 doesn't afraid of anything.

286

288

287−* `manipulateParams_` is like `manipulateParams` for a returning-free statement.

288−

289* `manipulate` is like `manipulateParams` for a parameter-free statement.

290

291−* `manipulate_` is like `manipulate` for a returning-free statement.

292−

293* `runQueryParams` is like `manipulateParams` for query statements.

291* `runQueryParams` is like `manipulateParams` for query statements.

294

292

295* `runQuery` is like `runQueryParams` for a parameter-free statement.

293* `runQuery` is like `runQueryParams` for a parameter-free statement.

@@ -303,7 +301,7 @@ instance IndexedMonadTransPQ PQ where

303* `forPrepared` is a flipped `traversePrepared`

301* `forPrepared` is a flipped `traversePrepared`

304

302

305* `traversePrepared_` is like `traversePrepared` but works on `Foldable`

303* `traversePrepared_` is like `traversePrepared` but works on `Foldable`

306− containers for a returning-free statement.

304+ containers and returns unit.

307

305

308* `forPrepared_` is a flipped `traversePrepared_`.

306* `forPrepared_` is a flipped `traversePrepared_`.

309

307

@@ -317,34 +315,24 @@ a default instance.

317-}

315-}

318class Monad pq => MonadPQ schemas pq | pq -> schemas where

316class Monad pq => MonadPQ schemas pq | pq -> schemas where

319 manipulateParams

317 manipulateParams

320− :: (ToParams x params, All OidOfParam params)

318+ :: ToParams x params

321 => Manipulation '[] schemas params ys

319 => Manipulation '[] schemas params ys

322 -- ^ `insertInto`, `update` or `deleteFrom`

320 -- ^ `insertInto`, `update` or `deleteFrom`

323 -> x -> pq (K LibPQ.Result ys)

321 -> x -> pq (K LibPQ.Result ys)

324 default manipulateParams

322 default manipulateParams

325 :: (MonadTrans t, MonadPQ schemas pq1, pq ~ t pq1)

323 :: (MonadTrans t, MonadPQ schemas pq1, pq ~ t pq1)

326− => (ToParams x params, All OidOfParam params)

324+ => ToParams x params

327 => Manipulation '[] schemas params ys

325 => Manipulation '[] schemas params ys

328 -- ^ `insertInto`, `update` or `deleteFrom`

326 -- ^ `insertInto`, `update` or `deleteFrom`

329 -> x -> pq (K LibPQ.Result ys)

327 -> x -> pq (K LibPQ.Result ys)

330 manipulateParams manipulation params = lift $

328 manipulateParams manipulation params = lift $

331 manipulateParams manipulation params

329 manipulateParams manipulation params

332

330

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−

340 manipulate :: Manipulation '[] schemas '[] ys -> pq (K LibPQ.Result ys)

331 manipulate :: Manipulation '[] schemas '[] ys -> pq (K LibPQ.Result ys)

341 manipulate statement = manipulateParams statement ()

332 manipulate statement = manipulateParams statement ()

342

333

343− manipulate_ :: Manipulation '[] schemas '[] '[] -> pq ()

344− manipulate_ = void . manipulate

345−

346 runQueryParams

334 runQueryParams

347− :: (ToParams x params, All OidOfParam params)

335+ :: ToParams x params

348 => Query '[] '[] schemas params ys

336 => Query '[] '[] schemas params ys

349 -- ^ `select` and friends

337 -- ^ `select` and friends

350 -> x -> pq (K LibPQ.Result ys)

338 -> x -> pq (K LibPQ.Result ys)

@@ -357,19 +345,19 @@ class Monad pq => MonadPQ schemas pq | pq -> schemas where

357 runQuery q = runQueryParams q ()

345 runQuery q = runQueryParams q ()

358

346

359 traversePrepared

347 traversePrepared

360− :: (ToParams x params, Traversable list, All OidOfParam params)

348+ :: (ToParams x params, Traversable list)

361 => Manipulation '[] schemas params ys

349 => Manipulation '[] schemas params ys

362 -- ^ `insertInto`, `update`, or `deleteFrom`, and friends

350 -- ^ `insertInto`, `update`, or `deleteFrom`, and friends

363 -> list x -> pq (list (K LibPQ.Result ys))

351 -> list x -> pq (list (K LibPQ.Result ys))

364 default traversePrepared

352 default traversePrepared

365 :: (MonadTrans t, MonadPQ schemas pq1, pq ~ t pq1)

353 :: (MonadTrans t, MonadPQ schemas pq1, pq ~ t pq1)

366− => (ToParams x params, Traversable list, All OidOfParam params)

354+ => (ToParams x params, Traversable list)

367 => Manipulation '[] schemas params ys -> list x -> pq (list (K LibPQ.Result ys))

355 => Manipulation '[] schemas params ys -> list x -> pq (list (K LibPQ.Result ys))

368 traversePrepared manipulation params = lift $

356 traversePrepared manipulation params = lift $

369 traversePrepared manipulation params

357 traversePrepared manipulation params

370

358

371 forPrepared

359 forPrepared

372− :: (ToParams x params, Traversable list, All OidOfParam params)

360+ :: (ToParams x params, Traversable list)

373 => list x

361 => list x

374 -> Manipulation '[] schemas params ys

362 -> Manipulation '[] schemas params ys

375 -- ^ `insertInto`, `update` or `deleteFrom`

363 -- ^ `insertInto`, `update` or `deleteFrom`

@@ -377,13 +365,13 @@ class Monad pq => MonadPQ schemas pq | pq -> schemas where

377 forPrepared = flip traversePrepared

365 forPrepared = flip traversePrepared

378

366

379 traversePrepared_

367 traversePrepared_

380− :: (ToParams x params, Foldable list, All OidOfParam params)

368+ :: (ToParams x params, Foldable list)

381 => Manipulation '[] schemas params '[]

369 => Manipulation '[] schemas params '[]

382 -- ^ `insertInto`, `update` or `deleteFrom`

370 -- ^ `insertInto`, `update` or `deleteFrom`

383 -> list x -> pq ()

371 -> list x -> pq ()

384 default traversePrepared_

372 default traversePrepared_

385 :: (MonadTrans t, MonadPQ schemas pq1, pq ~ t pq1)

373 :: (MonadTrans t, MonadPQ schemas pq1, pq ~ t pq1)

386− => (ToParams x params, Foldable list, All OidOfParam params)

374+ => (ToParams x params, Foldable list)

387 => Manipulation '[] schemas params '[]

375 => Manipulation '[] schemas params '[]

388 -- ^ `insertInto`, `update` or `deleteFrom`

376 -- ^ `insertInto`, `update` or `deleteFrom`

389 -> list x -> pq ()

377 -> list x -> pq ()

@@ -391,7 +379,7 @@ class Monad pq => MonadPQ schemas pq | pq -> schemas where

391 traversePrepared_ manipulation params

379 traversePrepared_ manipulation params

392

380

393 forPrepared_

381 forPrepared_

394− :: (ToParams x params, Foldable list, All OidOfParam params)

382+ :: (ToParams x params, Foldable list)

395 => list x

383 => list x

396 -> Manipulation '[] schemas params '[]

384 -> Manipulation '[] schemas params '[]

397 -- ^ `insertInto`, `update` or `deleteFrom`

385 -- ^ `insertInto`, `update` or `deleteFrom`

@@ -404,83 +392,61 @@ class Monad pq => MonadPQ schemas pq | pq -> schemas where

404 => (LibPQ.Connection -> IO a) -> pq a

392 => (LibPQ.Connection -> IO a) -> pq a

405 liftPQ = lift . liftPQ

393 liftPQ = lift . liftPQ

406

394

407−instance (MonadIO io, schemas0 ~ schemas, schemas1 ~ schemas)

395+instance (MonadBase IO io, schemas0 ~ schemas, schemas1 ~ schemas)

408 => MonadPQ schemas (PQ schemas0 schemas1 io) where

396 => MonadPQ schemas (PQ schemas0 schemas1 io) where

409

397

410 manipulateParams

398 manipulateParams

411 (UnsafeManipulation q :: Manipulation '[] schemas ps ys) (params :: x) =

399 (UnsafeManipulation q :: Manipulation '[] schemas ps ys) (params :: x) =

412 PQ $ \ (K conn) -> do

400 PQ $ \ (K conn) -> do

413 let

401 let

414− paramSet

402+ toParam' encoding =

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)

403+ (LibPQ.invalidOid, encodingBytes encoding, LibPQ.Binary)

421− params'

422− = hcollapse

423− . hcmap (Proxy @OidOfParam) paramSet

424− $ toParams @x @ps params

404+ params' = fmap (fmap toParam') (hcollapse (toParams @x @ps params))

425 q' = q <> ";"

405 q' = q <> ";"

426− resultMaybe <- liftIO $ LibPQ.execParams conn q' params' LibPQ.Binary

406+ resultMaybe <- liftBase $ LibPQ.execParams conn q' params' LibPQ.Binary

427 case resultMaybe of

407 case resultMaybe of

428 Nothing -> throw $ ResultException

408 Nothing -> throw $ ResultException

429 "manipulateParams: LibPQ.execParams returned no results"

409 "manipulateParams: LibPQ.execParams returned no results"

430 Just result -> do

410 Just result -> do

431− okResult_ result

411+ tryResult result

432 return $ K (K result)

412 return $ K (K result)

433

413

434 traversePrepared

414 traversePrepared

435 (UnsafeManipulation q :: Manipulation '[] schemas xs ys) (list :: list x) =

415 (UnsafeManipulation q :: Manipulation '[] schemas xs ys) (list :: list x) =

436− PQ $ \ (K conn) -> liftIO $ do

416+ PQ $ \ (K conn) -> liftBase $ do

437− let

438− temp = "temporary_statement"

417+ let 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')

418+ prepResultMaybe <- LibPQ.prepare conn temp q Nothing

446 case prepResultMaybe of

419 case prepResultMaybe of

447 Nothing -> throw $ ResultException

420 Nothing -> throw $ ResultException

448 "traversePrepared: LibPQ.prepare returned no results"

421 "traversePrepared: LibPQ.prepare returned no results"

449− Just prepResult -> okResult_ prepResult

422+ Just prepResult -> tryResult prepResult

450 results <- for list $ \ params -> do

423 results <- for list $ \ params -> do

451 let

424 let

452− toParam' encoding = (encodingBytes encoding, LibPQ.Binary)

425+ toParam' encoding = (encodingBytes encoding,LibPQ.Binary)

453 params' = fmap (fmap toParam') (hcollapse (toParams @x @xs params))

426 params' = fmap (fmap toParam') (hcollapse (toParams @x @xs params))

454 resultMaybe <- LibPQ.execPrepared conn temp params' LibPQ.Binary

427 resultMaybe <- LibPQ.execPrepared conn temp params' LibPQ.Binary

455 case resultMaybe of

428 case resultMaybe of

456 Nothing -> throw $ ResultException

429 Nothing -> throw $ ResultException

457 "traversePrepared: LibPQ.execParams returned no results"

430 "traversePrepared: LibPQ.execParams returned no results"

458 Just result -> do

431 Just result -> do

459− okResult_ result

432+ tryResult result

460 return $ K result

433 return $ K result

461 deallocResultMaybe <- LibPQ.exec conn ("DEALLOCATE " <> temp <> ";")

434 deallocResultMaybe <- LibPQ.exec conn ("DEALLOCATE " <> temp <> ";")

462 case deallocResultMaybe of

435 case deallocResultMaybe of

463 Nothing -> throw $ ResultException

436 Nothing -> throw $ ResultException

464 "traversePrepared: LibPQ.exec DEALLOCATE returned no results"

437 "traversePrepared: LibPQ.exec DEALLOCATE returned no results"

465− Just deallocResult -> okResult_ deallocResult

438+ Just deallocResult -> tryResult deallocResult

466 return (K results)

439 return (K results)

467

440

468 traversePrepared_

441 traversePrepared_

469 (UnsafeManipulation q :: Manipulation '[] schemas xs '[]) (list :: list x) =

442 (UnsafeManipulation q :: Manipulation '[] schemas xs '[]) (list :: list x) =

470− PQ $ \ (K conn) -> liftIO $ do

443+ PQ $ \ (K conn) -> liftBase $ do

471− let

472− temp = "temporary_statement"

444+ let 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')

445+ prepResultMaybe <- LibPQ.prepare conn temp q Nothing

480 case prepResultMaybe of

446 case prepResultMaybe of

481 Nothing -> throw $ ResultException

447 Nothing -> throw $ ResultException

482 "traversePrepared_: LibPQ.prepare returned no results"

448 "traversePrepared_: LibPQ.prepare returned no results"

483− Just prepResult -> okResult_ prepResult

449+ Just prepResult -> tryResult prepResult

484 for_ list $ \ params -> do

450 for_ list $ \ params -> do

485 let

451 let

486 toParam' encoding = (encodingBytes encoding, LibPQ.Binary)

452 toParam' encoding = (encodingBytes encoding, LibPQ.Binary)

@@ -489,16 +455,16 @@ instance (MonadIO io, schemas0 ~ schemas, schemas1 ~ schemas)

489 case resultMaybe of

455 case resultMaybe of

490 Nothing -> throw $ ResultException

456 Nothing -> throw $ ResultException

491 "traversePrepared_: LibPQ.execParams returned no results"

457 "traversePrepared_: LibPQ.execParams returned no results"

492− Just result -> okResult_ result

458+ Just result -> tryResult result

493 deallocResultMaybe <- LibPQ.exec conn ("DEALLOCATE " <> temp <> ";")

459 deallocResultMaybe <- LibPQ.exec conn ("DEALLOCATE " <> temp <> ";")

494 case deallocResultMaybe of

460 case deallocResultMaybe of

495 Nothing -> throw $ ResultException

461 Nothing -> throw $ ResultException

496 "traversePrepared: LibPQ.exec DEALLOCATE returned no results"

462 "traversePrepared: LibPQ.exec DEALLOCATE returned no results"

497− Just deallocResult -> okResult_ deallocResult

463+ Just deallocResult -> tryResult deallocResult

498 return (K ())

464 return (K ())

499

465

500 liftPQ pq = PQ $ \ (K conn) -> do

466 liftPQ pq = PQ $ \ (K conn) -> do

501− y <- liftIO $ pq conn

467+ y <- liftBase $ pq conn

502 return (K y)

468 return (K y)

503

469

504instance MonadPQ schemas m => MonadPQ schemas (IdentityT m)

470instance MonadPQ schemas m => MonadPQ schemas (IdentityT m)

@@ -539,29 +505,40 @@ instance schemas0 ~ schemas1 => MMonad (PQ schemas0 schemas1) where

539 embed f (PQ pq) = PQ $ \ conn -> do

505 embed f (PQ pq) = PQ $ \ conn -> do

540 evalPQ (f (pq conn)) conn

506 evalPQ (f (pq conn)) conn

541

507

508+instance (MonadBase b m, schemas0 ~ schemas1)

509+ => MonadBase b (PQ schemas0 schemas1 m) where

510+ liftBase = lift . liftBase

511+

542instance (MonadIO m, schema0 ~ schema1)

512instance (MonadIO m, schema0 ~ schema1)

543 => MonadIO (PQ schema0 schema1 m) where

513 => MonadIO (PQ schema0 schema1 m) where

544 liftIO = lift . liftIO

514 liftIO = lift . liftIO

545

515

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+

546−instance (MonadUnliftIO m, schemas0 ~ schemas1)

525+instance (MonadBaseControl b m, schemas0 ~ schemas1)

547− => MonadUnliftIO (PQ schemas0 schemas1 m) where

526+ => MonadBaseControl b (PQ schemas0 schemas1 m) where

548− withRunInIO

527+ type StM (PQ schemas0 schemas1 m) x = StM m (K x schemas0)

549− :: ((forall a . PQ schemas0 schema1 m a -> IO a) -> IO b)

528+ liftBaseWith f =

550− -> PQ schemas0 schema1 m b

529+ pqliftWith $ \ run -> liftBaseWith $ \ runInBase -> f $ runInBase . run

551− withRunInIO inner = PQ $ \conn ->

530+ restoreM = PQ . const . restoreM

552− withRunInIO $ \(run :: (forall x . m x -> IO x)) ->

553− K <$> inner (\pq -> run $ unK <$> unPQ pq conn)

554

531

555-- | Get a row corresponding to a given row number from a `LibPQ.Result`,

532-- | Get a row corresponding to a given row number from a `LibPQ.Result`,

556-- throwing an exception if the row number is out of bounds.

533-- throwing an exception if the row number is out of bounds.

557getRow

534getRow

558− :: (FromRow columns y, MonadIO io)

535+ :: (FromRow columns y, MonadBase IO io)

559 => LibPQ.Row

536 => LibPQ.Row

560 -- ^ row number

537 -- ^ row number

561 -> K LibPQ.Result columns

538 -> K LibPQ.Result columns

562 -- ^ result

539 -- ^ result

563 -> io y

540 -> io y

564−getRow r (K result :: K LibPQ.Result columns) = liftIO $ do

541+getRow r (K result :: K LibPQ.Result columns) = liftBase $ do

565 numRows <- LibPQ.ntuples result

542 numRows <- LibPQ.ntuples result

566 when (numRows < r) $ throw $ ResultException $

543 when (numRows < r) $ throw $ ResultException $

567 "getRow: expected at least " <> pack (show r) <> "rows but only saw "

544 "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

579-- and a `LibPQ.Result` and given a row number if it's too large returns `Nothing`,

556-- and a `LibPQ.Result` and given a row number if it's too large returns `Nothing`,

580-- otherwise returning the row along with the next row number.

557-- otherwise returning the row along with the next row number.

581nextRow

558nextRow

582− :: (FromRow columns y, MonadIO io)

559+ :: (FromRow columns y, MonadBase IO io)

583 => LibPQ.Row -- ^ total number of rows

560 => LibPQ.Row -- ^ total number of rows

584 -> K LibPQ.Result columns -- ^ result

561 -> K LibPQ.Result columns -- ^ result

585 -> LibPQ.Row -- ^ row number

562 -> LibPQ.Row -- ^ row number

586 -> io (Maybe (LibPQ.Row,y))

563 -> io (Maybe (LibPQ.Row,y))

587nextRow total (K result :: K LibPQ.Result columns) r

564nextRow 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

589 let len = fromIntegral (lengthSList (Proxy @columns))

566 let len = fromIntegral (lengthSList (Proxy @columns))

590 row' <- traverse (LibPQ.getvalue result r) [0 .. len - 1]

567 row' <- traverse (LibPQ.getvalue result r) [0 .. len - 1]

591 case fromList row' of

568 case fromList row' of

@@ -596,10 +573,10 @@ nextRow total (K result :: K LibPQ.Result columns) r

596

573

597-- | Get all rows from a `LibPQ.Result`.

574-- | Get all rows from a `LibPQ.Result`.

598getRows

575getRows

599− :: (FromRow columns y, MonadIO io)

576+ :: (FromRow columns y, MonadBase IO io)

600 => K LibPQ.Result columns -- ^ result

577 => K LibPQ.Result columns -- ^ result

601 -> io [y]

578 -> io [y]

602−getRows (K result :: K LibPQ.Result columns) = liftIO $ do

579+getRows (K result :: K LibPQ.Result columns) = liftBase $ do

603 let len = fromIntegral (lengthSList (Proxy @columns))

580 let len = fromIntegral (lengthSList (Proxy @columns))

604 numRows <- LibPQ.ntuples result

581 numRows <- LibPQ.ntuples result

605 for [0 .. numRows - 1] $ \ r -> do

582 for [0 .. numRows - 1] $ \ r -> do

@@ -612,10 +589,10 @@ getRows (K result :: K LibPQ.Result columns) = liftIO $ do

612

589

613-- | Get the first row if possible from a `LibPQ.Result`.

590-- | Get the first row if possible from a `LibPQ.Result`.

614firstRow

591firstRow

615− :: (FromRow columns y, MonadIO io)

592+ :: (FromRow columns y, MonadBase IO io)

616 => K LibPQ.Result columns -- ^ result

593 => K LibPQ.Result columns -- ^ result

617 -> io (Maybe y)

594 -> io (Maybe y)

618−firstRow (K result :: K LibPQ.Result columns) = liftIO $ do

595+firstRow (K result :: K LibPQ.Result columns) = liftBase $ do

619 numRows <- LibPQ.ntuples result

596 numRows <- LibPQ.ntuples result

620 if numRows <= 0 then return Nothing else do

597 if numRows <= 0 then return Nothing else do

621 let len = fromIntegral (lengthSList (Proxy @columns))

598 let len = fromIntegral (lengthSList (Proxy @columns))

@@ -628,23 +605,23 @@ firstRow (K result :: K LibPQ.Result columns) = liftIO $ do

628

605

629-- | Lifts actions on results from @LibPQ@.

606-- | Lifts actions on results from @LibPQ@.

630liftResult

607liftResult

631− :: MonadIO io

608+ :: MonadBase IO io

632 => (LibPQ.Result -> IO x)

609 => (LibPQ.Result -> IO x)

633 -> K LibPQ.Result results -> io x

610 -> K LibPQ.Result results -> io x

634−liftResult f (K result) = liftIO $ f result

611+liftResult f (K result) = liftBase $ f result

635

612

636-- | Returns the number of rows (tuples) in the query result.

613-- | 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

638ntuples = liftResult LibPQ.ntuples

615ntuples = liftResult LibPQ.ntuples

639

616

640-- | Returns the result status of the command.

617-- | 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

642resultStatus = liftResult LibPQ.resultStatus

619resultStatus = liftResult LibPQ.resultStatus

643

620

644-- | Returns the error message most recently generated by an operation

621-- | Returns the error message most recently generated by an operation

645-- on the connection.

622-- on the connection.

646resultErrorMessage

623resultErrorMessage

647− :: MonadIO io => K LibPQ.Result results -> io (Maybe ByteString)

624+ :: MonadBase IO io => K LibPQ.Result results -> io (Maybe ByteString)

648resultErrorMessage = liftResult LibPQ.resultErrorMessage

625resultErrorMessage = liftResult LibPQ.resultErrorMessage

649

626

650-- | Returns the error code most recently generated by an operation

627-- | Returns the error code most recently generated by an operation

@@ -652,29 +629,29 @@ resultErrorMessage = liftResult LibPQ.resultErrorMessage

652--

629--

653-- https://www.postgresql.org/docs/current/static/errcodes-appendix.html

630-- https://www.postgresql.org/docs/current/static/errcodes-appendix.html

654resultErrorCode

631resultErrorCode

655− :: MonadIO io

632+ :: MonadBase IO io

656 => K LibPQ.Result results

633 => K LibPQ.Result results

657 -> io (Maybe ByteString)

634 -> io (Maybe ByteString)

658resultErrorCode = liftResult (flip LibPQ.resultErrorField LibPQ.DiagSqlstate)

635resultErrorCode = liftResult (flip LibPQ.resultErrorField LibPQ.DiagSqlstate)

659

636

660−-- | the state of LibPQ

637+-- | `Exception`s that can be thrown by Squeal.

661−data PQState = PQState

638+data SquealException

639+ = PQException

662 { sqlExecStatus :: LibPQ.ExecStatus

640 { sqlExecStatus :: LibPQ.ExecStatus

663 , sqlStateCode :: Maybe ByteString

641 , sqlStateCode :: Maybe ByteString

664 -- ^ https://www.postgresql.org/docs/current/static/errcodes-appendix.html

642 -- ^ https://www.postgresql.org/docs/current/static/errcodes-appendix.html

665 , sqlErrorMessage :: Maybe ByteString

643 , sqlErrorMessage :: Maybe ByteString

666− } deriving (Eq, Show)

644+ }

667−

668−-- | `Exception`s that can be thrown by Squeal.

669−data SquealException

670− = PQException PQState

671 | ResultException Text

645 | ResultException Text

672 | ParseException Text

646 | ParseException Text

673 deriving (Eq, Show)

647 deriving (Eq, Show)

674instance Exception SquealException

648instance Exception SquealException

675

649

650+tryResult

651+ :: MonadBase IO io

676−okResult_ :: MonadIO io => LibPQ.Result -> io ()

652+ => LibPQ.Result

677−okResult_ result = liftIO $ do

653+ -> io ()

654+tryResult result = liftBase $ do

678 status <- LibPQ.resultStatus result

655 status <- LibPQ.resultStatus result

679 case status of

656 case status of

680 LibPQ.CommandOk -> return ()

657 LibPQ.CommandOk -> return ()

@@ -682,16 +659,11 @@ okResult_ result = liftIO $ do

682 _ -> do

659 _ -> do

683 stateCode <- LibPQ.resultErrorField result LibPQ.DiagSqlstate

660 stateCode <- LibPQ.resultErrorField result LibPQ.DiagSqlstate

684 msg <- LibPQ.resultErrorMessage result

661 msg <- LibPQ.resultErrorMessage result

685− throw . PQException $ PQState status stateCode msg

662+ throw $ PQException 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

691

663

692-- | Catch `SquealException`s.

664-- | Catch `SquealException`s.

693catchSqueal

665catchSqueal

694− :: MonadUnliftIO io

666+ :: MonadBaseControl IO io

695 => io a

667 => io a

696 -> (SquealException -> io a) -- ^ handler

668 -> (SquealException -> io a) -- ^ handler

697 -> io a

669 -> io a

@@ -699,14 +671,7 @@ catchSqueal = catch

699

671

700-- | Handle `SquealException`s.

672-- | Handle `SquealException`s.

701handleSqueal

673handleSqueal

702− :: MonadUnliftIO io

674+ :: MonadBaseControl IO io

703 => (SquealException -> io a) -- ^ handler

675 => (SquealException -> io a) -- ^ handler

704 -> io a -> io a

676 -> io a -> io a

705handleSqueal = handle

677handleSqueal = 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 @@

1{-|

2−Module: Squeal.PostgreSQL.Pool

2+Module: Squeal.PostgreSQL.Definition

3−Description: Connection pools

3+Description: Pooled connections

4Copyright: (c) Eitan Chatav, 2017

5Maintainer: eitan@morphism.tech

6Stability: experimental

8−Connection pools.

8+A `MonadPQ` for pooled connections.

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

31-}

9-}

33{-# LANGUAGE

11{-# LANGUAGE

34 DeriveFunctor

12 DeriveFunctor

35 , FlexibleContexts

13 , FlexibleContexts

36 , FlexibleInstances

14 , FlexibleInstances

37− , InstanceSigs

38 , MultiParamTypeClasses

15 , MultiParamTypeClasses

39 , RankNTypes

16 , RankNTypes

40 , ScopedTypeVariables

17 , ScopedTypeVariables

@@ -45,24 +22,57 @@ a

46module Squeal.PostgreSQL.Pool

23module Squeal.PostgreSQL.Pool

47 ( -- * Pools

24 ( -- * Pools

48− Pool

25+ PoolPQ (..)

49 , createConnectionPool

26 , createConnectionPool

50− , usingConnectionPool

27+ , Pool

51− , destroyConnectionPool

28+ , destroyAllResources

29+ , PoolPQRun

30+ , poolpqliftWith

52 ) where

31 ) where

33+import Control.Monad.Base

34+import Control.Monad.Trans

35+import Control.Monad.Trans.Control

54import Data.ByteString

36import Data.ByteString

37+import Data.Pool

55import Data.Time

38import Data.Time

56−import Generics.SOP (K(..), unK)

39+import Generics.SOP (K(..))

57−import UnliftIO (MonadUnliftIO (..))

40+

58−import UnliftIO.Pool (Pool, createPool, destroyAllResources, withResource)

41+import qualified Control.Monad.Fail as Fail

60import Squeal.PostgreSQL.PQ

43import 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

62-- | Create a striped pool of connections.

72-- | Create a striped pool of connections.

63-- 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.

73-- 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.

64createConnectionPool

74createConnectionPool

65− :: MonadUnliftIO io

75+ :: MonadBase IO io

66 => ByteString

76 => ByteString

67 -- ^ The passed string can be empty to use all default parameters, or it can

77 -- ^ The passed string can be empty to use all default parameters, or it can

68 -- contain one or more parameter settings separated by whitespace.

78 -- contain one or more parameter settings separated by whitespace.

@@ -79,44 +89,71 @@ createConnectionPool

79 -- ^ Maximum number of connections to keep open per stripe. The smallest acceptable value is 1.

89 -- ^ Maximum number of connections to keep open per stripe. The smallest acceptable value is 1.

80 -- Requests for connections will block if this limit is reached on a single stripe, even if other stripes have idle connections available.

90 -- Requests for connections will block if this limit is reached on a single stripe, even if other stripes have idle connections available.

81 -> io (Pool (K Connection schemas))

91 -> io (Pool (K Connection schemas))

82−createConnectionPool conninfo stripes idle maxResrc =

92+createConnectionPool conninfo stripes idle maxResrc = liftBase $

83 createPool (connectdb conninfo) finish stripes idle maxResrc

93 createPool (connectdb conninfo) finish stripes idle maxResrc

85−{-|

95+-- | `Applicative` instance for `PoolPQ`.

86−Temporarily take a connection from a `Pool`, perform an action with it,

96+instance Monad m => Applicative (PoolPQ schemas m) where

87−and return it to the pool afterwards.

97+ pure x = PoolPQ $ \ _ -> pure x

88−

98+ PoolPQ f <*> PoolPQ x = PoolPQ $ \ pool -> do

89−If the pool has an idle connection available, it is used immediately.

99+ f' <- f pool

90−Otherwise, if the maximum number of connections has not yet been reached,

100+ x' <- x pool

91−a new connection is created and used.

101+ return $ f' x'

92−If the maximum number of connections has been reached, this function blocks

102+

93−until a connection becomes available.

103+-- | `Monad` instance for `PoolPQ`.

94−-}

104+instance Monad m => Monad (PoolPQ schemas m) where

95−usingConnectionPool

105+ return = pure

96− :: MonadUnliftIO io

106+ PoolPQ x >>= f = PoolPQ $ \ pool -> do

97− => Pool (K Connection schemas) -- ^ pool

107+ x' <- x pool

98− -> PQ schemas schemas io x -- ^ session

108+ runPoolPQ (f x') pool

99− -> io x

109+

100−usingConnectionPool pool (PQ session) = unK <$> withResource pool session

110+-- | `Fail.MonadFail` instance for `PoolPQ`.

101−

111+instance Monad m => Fail.MonadFail (PoolPQ schemas m) where

102−{- |

112+ fail = Fail.fail

103−Destroy all connections in all stripes in the pool.

113+

104−Note that this will ignore any exceptions in the destroy function.

114+-- | `MonadTrans` instance for `PoolPQ`.

105−

115+instance MonadTrans (PoolPQ schemas) where

106−This function is useful when you detect that all connections

116+ lift m = PoolPQ $ \ _pool -> m

107−in the pool are broken. For example after a database has been

117+

108−restarted all connections opened before the restart will be broken.

118+-- | `MonadBase` instance for `PoolPQ`.

109−In that case it's better to close those connections so that

119+instance MonadBase b m => MonadBase b (PoolPQ schemas m) where

110−`usingConnectionPool` won't take a broken connection from the pool

120+ liftBase = lift . liftBase

111−but will open a new connection instead.

121+

112−

122+-- | `MonadPQ` instance for `PoolPQ`.

113−Another use-case for this function is that when you know you are done

123+instance MonadBaseControl IO io => MonadPQ schemas (PoolPQ schemas io) where

114−with the pool you can destroy all idle connections immediately

124+ manipulateParams manipulation params = PoolPQ $ \ pool -> do

115−instead of waiting on the garbage collector to destroy them,

125+ withResource pool $ \ conn -> do

116−thus freeing up those connections sooner.

126+ (K result :: K (K Result ys) schemas) <- flip unPQ conn $

117−-}

127+ manipulateParams manipulation params

118−destroyConnectionPool

128+ return result

119− :: MonadUnliftIO io

129+ traversePrepared manipulation params = PoolPQ $ \ pool ->

120− => Pool (K Connection schemas) -- ^ pool

130+ withResource pool $ \ conn -> do

121− -> io ()

131+ (K result :: K (list (K Result ys)) schemas) <- flip unPQ conn $

122−destroyConnectionPool = destroyAllResources

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+425−310

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

1{-|

2Module: Squeal.PostgreSQL.Query

3Description: Squeal queries

4−Copyright: (c) Eitan Chatav, 2019

4+Copyright: (c) Eitan Chatav, 2017

5Maintainer: eitan@morphism.tech

6Stability: experimental

@@ -32,15 +32,13 @@ Squeal queries.

33module Squeal.PostgreSQL.Query

34 ( -- * Queries

35− Query_

35+ Query (..)

36− , Query (..)

36+ , Query_

37 -- ** Select

38 , select

39 , select_

40 , selectDistinct

41 , selectDistinct_

42− , selectDistinctOn

43− , selectDistinctOn_

44 , Selection (..)

42 , Selection (..)

45 -- ** Values

43 -- ** Values

46 , values

44 , values

@@ -55,7 +53,23 @@ module Squeal.PostgreSQL.Query

55 -- ** With

53 -- ** With

56 , With (..)

54 , With (..)

57 , CommonTableExpression (..)

55 , 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

59 -- * Table Expressions

73 -- * Table Expressions

60 , TableExpression (..)

74 , TableExpression (..)

61 , from

75 , from

@@ -79,6 +93,13 @@ module Squeal.PostgreSQL.Query

79 , By (..)

93 , By (..)

80 , GroupByClause (..)

94 , GroupByClause (..)

81 , HavingClause (..)

95 , HavingClause (..)

96+ -- * Subquery Expressions

97+ , exists

98+ , in_

99+ , notIn

100+ , Operator

101+ , subAll

102+ , subAny

82 ) where

103 ) where

104

84import Control.DeepSeq

105import Control.DeepSeq

@@ -91,67 +112,14 @@ import GHC.TypeLits

112

92import qualified GHC.Generics as GHC

113import qualified GHC.Generics as GHC

114

94−import Squeal.PostgreSQL.Alias

115+import Squeal.PostgreSQL.Binary

95import Squeal.PostgreSQL.Expression

116import 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

101import Squeal.PostgreSQL.Render

117import Squeal.PostgreSQL.Render

102import Squeal.PostgreSQL.Schema

118import Squeal.PostgreSQL.Schema

103

119

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−

133{- |

120{- |

134−The top level `Query_` type is parameterized by a @schemas@ `SchemasType`,

121+The process of retrieving or the command to retrieve data from a database

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.

122+is called a `Query`. 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−:}

155

123

156simple query:

124simple query:

157

125

@@ -159,7 +127,7 @@ simple query:

159>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]

127>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]

160>>> :{

128>>> :{

161let

129let

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

130+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

163 query = select Star (from (table #tab))

131 query = select Star (from (table #tab))

164in printSQL query

132in printSQL query

165:}

133:}

@@ -169,21 +137,21 @@ restricted query:

169

137

170>>> :{

138>>> :{

171let

139let

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

140+ query :: Query '[] '[] (Public Schema) '[] '["sum" ::: 'NotNull 'PGint4, "col1" ::: 'NotNull 'PGint4]

173 query =

141 query =

174− select_ ((#col1 + #col2) `as` #col1 :* #col1 `as` #col2)

142+ select_ ((#col1 + #col2) `as` #sum :* #col1)

175 ( from (table #tab)

143 ( from (table #tab)

176 & where_ (#col1 .> #col2)

144 & where_ (#col1 .> #col2)

177 & where_ (#col2 .> 0) )

145 & where_ (#col2 .> 0) )

178in printSQL query

146in printSQL query

179:}

147:}

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))

181

149

182subquery:

150subquery:

183

151

184>>> :{

152>>> :{

185let

153let

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

154+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

187 query = select Star (from (subquery (select Star (from (table #tab)) `as` #sub)))

155 query = select Star (from (subquery (select Star (from (table #tab)) `as` #sub)))

188in printSQL query

156in printSQL query

189:}

157:}

@@ -193,7 +161,7 @@ limits and offsets:

193

161

194>>> :{

162>>> :{

195let

163let

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

164+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

197 query = select Star (from (table #tab) & limit 100 & offset 2 & limit 50 & offset 2)

165 query = select Star (from (table #tab) & limit 100 & offset 2 & limit 50 & offset 2)

198in printSQL query

166in printSQL query

199:}

167:}

@@ -203,7 +171,7 @@ parameterized query:

203

171

204>>> :{

172>>> :{

205let

173let

206− query :: Query_ (Public Schema) (Only Int32) (Row Int32 Int32)

174+ query :: Query '[] '[] (Public Schema) '[ 'NotNull 'PGint4] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

207 query = select Star (from (table #tab) & where_ (#col1 .> param @1))

175 query = select Star (from (table #tab) & where_ (#col1 .> param @1))

208in printSQL query

176in printSQL query

209:}

177:}

@@ -213,21 +181,21 @@ aggregation query:

213

181

214>>> :{

182>>> :{

215let

183let

216− query :: Query_ (Public Schema) () (Row Int64 Int32)

184+ query :: Query '[] '[] (Public Schema) '[] '["sum" ::: 'NotNull 'PGint4, "col1" ::: 'NotNull 'PGint4 ]

217 query =

185 query =

218− select_ ((fromNull 0 (sum_ (All #col2))) `as` #col1 :* #col1 `as` #col2)

186+ select_ (sum_ (All #col2) `as` #sum :* #col1)

219 ( from (table (#tab `as` #table1))

187 ( from (table (#tab `as` #table1))

220 & groupBy #col1

188 & groupBy #col1

221− & having (sum_ (Distinct #col2) .> 1) )

189+ & having (#col1 + sum_ (Distinct #col2) .> 1) )

222in printSQL query

190in printSQL query

223:}

191:}

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)

225

193

226sorted query:

194sorted query:

227

195

228>>> :{

196>>> :{

229let

197let

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

198+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

231 query = select Star (from (table #tab) & orderBy [#col1 & Asc])

199 query = select Star (from (table #tab) & orderBy [#col1 & Asc])

232in printSQL query

200in printSQL query

233:}

201:}

@@ -235,12 +203,14 @@ SELECT * FROM "tab" AS "tab" ORDER BY "col1" ASC

235

203

236joins:

204joins:

237

205

206+>>> :set -XFlexibleContexts

238>>> :{

207>>> :{

239type OrdersColumns =

208type OrdersColumns =

240 '[ "id" ::: 'NoDef :=> 'NotNull 'PGint4

209 '[ "id" ::: 'NoDef :=> 'NotNull 'PGint4

241− , "price" ::: 'NoDef :=> 'NotNull 'PGfloat4

210+ , "price" ::: 'NoDef :=> 'NotNull 'PGfloat4

242− , "customer_id" ::: 'NoDef :=> 'NotNull 'PGint4

211+ , "customer_id" ::: 'NoDef :=> 'NotNull 'PGint4

243− , "shipper_id" ::: 'NoDef :=> 'NotNull 'PGint4 ]

212+ , "shipper_id" ::: 'NoDef :=> 'NotNull 'PGint4

213+ ]

244:}

214:}

245

215

246>>> :{

216>>> :{

@@ -256,27 +226,22 @@ type OrdersConstraints =

256>>> :{

226>>> :{

257type OrdersSchema =

227type OrdersSchema =

258 '[ "orders" ::: 'Table (OrdersConstraints :=> OrdersColumns)

228 '[ "orders" ::: 'Table (OrdersConstraints :=> OrdersColumns)

259− , "customers" ::: 'Table (CustomersConstraints :=> NamesColumns)

229+ , "customers" ::: 'Table (CustomersConstraints :=> NamesColumns)

260− , "shippers" ::: 'Table (ShippersConstraints :=> NamesColumns) ]

230+ , "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

271:}

231:}

272

232

273>>> :{

233>>> :{

274let

234let

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+ ]

276 query = select_

241 query = select_

277− ( #o ! #price `as` #price :*

242+ ( #o ! #price `as` #order_price :*

278− #c ! #name `as` #customerName :*

243+ #c ! #name `as` #customer_name :*

279− #s ! #name `as` #shipperName )

244+ #s ! #name `as` #shipper_name )

280 ( from (table (#orders `as` #o)

245 ( from (table (#orders `as` #o)

281 & innerJoin (table (#customers `as` #c))

246 & innerJoin (table (#customers `as` #c))

282 (#o ! #customer_id .== #c ! #id)

247 (#o ! #customer_id .== #c ! #id)

@@ -284,16 +249,14 @@ let

284 (#o ! #shipper_id .== #s ! #id)) )

249 (#o ! #shipper_id .== #s ! #id)) )

285in printSQL query

250in printSQL query

286:}

251:}

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")

288

253

289self-join:

254self-join:

290

255

291>>> :{

256>>> :{

292let

257let

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

258+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

294− query = select

295− (#t1 & DotStar)

296− (from (table (#tab `as` #t1) & crossJoin (table (#tab `as` #t2))))

259+ query = select (#t1 & DotStar) (from (table (#tab `as` #t1) & crossJoin (table (#tab `as` #t2))))

297in printSQL query

260in printSQL query

298:}

261:}

299SELECT "t1".* FROM "tab" AS "t1" CROSS JOIN "tab" AS "t2"

262SELECT "t1".* FROM "tab" AS "t1" CROSS JOIN "tab" AS "t2"

@@ -302,19 +265,17 @@ value queries:

302

265

303>>> :{

266>>> :{

304let

267let

305− query :: Query_ schemas () (Row String Bool)

268+ query :: Query '[] commons schemas '[] '["foo" ::: 'NotNull 'PGint2, "bar" ::: 'NotNull 'PGbool]

306− query = values

269+ query = values (1 `as` #foo :* true `as` #bar) [2 `as` #foo :* false `as` #bar]

307− ("true" `as` #col1 :* true `as` #col2)

308− ["false" `as` #col1 :* false `as` #col2]

309in printSQL query

270in printSQL query

310:}

271:}

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")

312

273

313set operations:

274set operations:

314

275

315>>> :{

276>>> :{

316let

277let

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

278+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

318 query = select Star (from (table #tab)) `unionAll` select Star (from (table #tab))

279 query = select Star (from (table #tab)) `unionAll` select Star (from (table #tab))

319in printSQL query

280in printSQL query

320:}

281:}

@@ -324,7 +285,7 @@ with queries:

324

285

325>>> :{

286>>> :{

326let

287let

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

288+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

328 query = with (

289 query = with (

329 select Star (from (table #tab)) `as` #cte1 :>>

290 select Star (from (table #tab)) `as` #cte1 :>>

330 select Star (from (common #cte1)) `as` #cte2

291 select Star (from (common #cte1)) `as` #cte2

@@ -337,35 +298,40 @@ window function queries

337

298

338>>> :{

299>>> :{

339let

300let

340− query :: Query_ (Public Schema) () (Row Int32 Int64)

301+ query :: Query '[] '[] (Public Schema) '[] ["col1" ::: 'NotNull 'PGint4, "rank" ::: 'NotNull 'PGint8]

341 query = select

302 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])))

343 (from (table #tab))

304 (from (table #tab))

344in printSQL query

305in printSQL query

345:}

306:}

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"

347

308

348correlated subqueries

309correlated subqueries

349

310

350>>> :{

311>>> :{

351let

312let

352− query :: Query_ (Public Schema) () (Only Int32)

313+ query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4]

353 query =

314 query =

354− select (#col1 `as` #fromOnly) (from (table (#tab `as` #t1))

315+ select #col1 (from (table (#tab `as` #t1))

355 & where_ (exists (

316 & where_ (exists (

356 select Star (from (table (#tab `as` #t2))

317 select Star (from (table (#tab `as` #t2))

357 & where_ (#t2 ! #col2 .== #t1 ! #col1)))))

318 & where_ (#t2 ! #col2 .== #t1 ! #col1)))))

358in printSQL query

319in printSQL query

359:}

320:}

360−SELECT "col1" AS "fromOnly" FROM "tab" AS "t1" WHERE EXISTS (SELECT * FROM "tab" AS "t2" WHERE ("t2"."col2" = "t1"."col1"))

321+SELECT "col1" AS "col1" FROM "tab" AS "t1" WHERE EXISTS (SELECT * FROM "tab" AS "t2" WHERE ("t2"."col2" = "t1"."col1"))

361−

362-}

322-}

363−type family Query_

323+newtype Query

324+ (outer :: FromType)

325+ (commons :: FromType)

364 (schemas :: SchemasType)

326 (schemas :: SchemasType)

365− (parameters :: Type)

327+ (params :: [NullityType])

366− (row :: Type) where

328+ (row :: RowType)

367− Query_ schemas params row =

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

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

334+ Query_ schemas params row = Query '[] '[] schemas (TuplePG params) (RowPG row)

369

335

370-- | The results of two queries can be combined using the set operation

336-- | The results of two queries can be combined using the set operation

371-- `union`. Duplicate rows are eliminated.

337-- `union`. Duplicate rows are eliminated.

@@ -437,48 +403,35 @@ q1 `exceptAll` q2 = UnsafeQuery $

437SELECT queries

403SELECT queries

438-----------------------------------------}

404-----------------------------------------}

439

405

440−{- | The simplest kinds of `Selection` are `Star` and `DotStar` which

406+data Selection outer grp commons schemas params from row where

441−emits all columns that a `TableExpression` produces. A select `List`

407+ List

442−is a list of `Expression`s. A `Selection` could be a list of

408+ :: SListI row

443−`WindowFunction`s `Over` `WindowDefinition`. `Additional` `Selection`s can

409+ => NP (Aliased (Expression outer grp commons schemas params from)) row

444−be selected with `Also`.

445−-}

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

410+ -> Selection outer grp commons schemas params from row

447 Star

411 Star

448 :: HasUnique tab from row

412 :: HasUnique tab from row

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

413+ => Selection outer 'Ungrouped commons schemas params from row

450− -- ^ `HasUnique` table in the `FromClause`

451 DotStar

414 DotStar

452 :: Has tab from row

415 :: Has tab from row

453 => Alias tab

416 => Alias tab

454− -- ^ `Has` table with `Alias`

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

417+ -> Selection outer 'Ungrouped commons schemas params from row

456− List

418+ Also

457− :: SListI row

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

419+ :: Selection outer grp commons schemas params from right

459− -- ^ `NP` list of `Aliased` `Expression`s

420+ -> Selection outer grp commons schemas params from left

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

421+ -> Selection outer grp commons schemas params from (Join left right)

461 Over

422 Over

462 :: SListI row

423 :: SListI row

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

424+ => NP (Aliased (WindowFunction outer grp commons 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

425+ -> WindowDefinition outer grp commons schemas params from

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

472−instance Additional (Selection outer commons grp schemas params from) where

426+ -> Selection outer grp commons schemas params from row

473− also = Also

474instance (KnownSymbol col, row ~ '[col ::: ty])

427instance (KnownSymbol col, row ~ '[col ::: ty])

475 => Aliasable col

428 => Aliasable col

476− (Expression outer commons grp schemas params from ty)

429+ (Expression outer grp commons schemas params from ty)

477− (Selection outer commons grp schemas params from row) where

430+ (Selection outer grp commons schemas params from row) where

478 expr `as` col = List (expr `as` col)

431 expr `as` col = List (expr `as` col)

479instance (Has tab (Join outer from) row0, Has col row0 ty, row1 ~ '[col ::: ty])

432instance (Has tab (Join outer from) row0, Has col row0 ty, row1 ~ '[col ::: ty])

480 => IsQualified tab col

433 => IsQualified tab col

481− (Selection outer commons 'Ungrouped schemas params from row1) where

434+ (Selection outer 'Ungrouped commons schemas params from row1) where

482 tab ! col = tab ! col `as` col

435 tab ! col = tab ! col `as` col

483instance

436instance

484 ( Has tab (Join outer from) row0

437 ( Has tab (Join outer from) row0

@@ -486,11 +439,11 @@ instance

486 , row1 ~ '[col ::: ty]

439 , row1 ~ '[col ::: ty]

487 , GroupedBy tab col bys )

440 , GroupedBy tab col bys )

488 => IsQualified tab col

441 => 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

490 tab ! col = tab ! col `as` col

443 tab ! col = tab ! col `as` col

491instance (HasUnique tab (Join outer from) row0, Has col row0 ty, row1 ~ '[col ::: ty])

444instance (HasUnique tab (Join outer from) row0, Has col row0 ty, row1 ~ '[col ::: ty])

492 => IsLabel col

445 => IsLabel col

493− (Selection outer commons 'Ungrouped schemas params from row1) where

446+ (Selection outer 'Ungrouped commons schemas params from row1) where

494 fromLabel = fromLabel @col `as` Alias

447 fromLabel = fromLabel @col `as` Alias

495instance

448instance

496 ( HasUnique tab (Join outer from) row0

449 ( HasUnique tab (Join outer from) row0

@@ -498,10 +451,10 @@ instance

498 , row1 ~ '[col ::: ty]

451 , row1 ~ '[col ::: ty]

499 , GroupedBy tab col bys )

452 , GroupedBy tab col bys )

500 => IsLabel col

453 => IsLabel col

501− (Selection outer commons ('Grouped bys) schemas params from row1) where

454+ (Selection outer ('Grouped bys) commons schemas params from row1) where

502 fromLabel = fromLabel @col `as` Alias

455 fromLabel = fromLabel @col `as` Alias

503

456

504−instance RenderSQL (Selection outer commons grp schemas params from row) where

457+instance RenderSQL (Selection outer grp commons schemas params from row) where

505 renderSQL = \case

458 renderSQL = \case

506 List list -> renderCommaSeparated (renderAliased renderSQL) list

459 List list -> renderCommaSeparated (renderAliased renderSQL) list

507 Star -> "*"

460 Star -> "*"

@@ -510,7 +463,7 @@ instance RenderSQL (Selection outer commons grp schemas params from row) where

510 Over winFns winDef ->

463 Over winFns winDef ->

511 let

464 let

512 renderOver

465 renderOver

513− :: Aliased (WindowFunction outer commons grp schemas params from) field

466+ :: Aliased (WindowFunction outer grp commons schemas params from) field

514 -> ByteString

467 -> ByteString

515 renderOver (winFn `As` col) = renderSQL winFn

468 renderOver (winFn `As` col) = renderSQL winFn

516 <+> "OVER" <+> parenthesized (renderSQL winDef)

469 <+> "OVER" <+> parenthesized (renderSQL winDef)

@@ -519,7 +472,7 @@ instance RenderSQL (Selection outer commons grp schemas params from row) where

519 renderCommaSeparated renderOver winFns

472 renderCommaSeparated renderOver winFns

520

473

521instance IsString

474instance 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

523 fromString str = fromString str `as` Alias

476 fromString str = fromString str `as` Alias

524

477

525-- | the `TableExpression` in the `select` command constructs an intermediate

478-- | the `TableExpression` in the `select` command constructs an intermediate

@@ -529,9 +482,9 @@ instance IsString

529-- the intermediate table are actually output.

482-- the intermediate table are actually output.

530select

483select

531 :: (SListI row, row ~ (x ': xs))

484 :: (SListI row, row ~ (x ': xs))

532− => Selection outer commons grp schemas params from row

485+ => Selection outer grp commons schemas params from row

533− -- ^ selection

486+ -- ^ select list

534− -> TableExpression outer commons grp schemas params from

487+ -> TableExpression outer grp commons schemas params from

535 -- ^ intermediate virtual table

488 -- ^ intermediate virtual table

536 -> Query outer commons schemas params row

489 -> Query outer commons schemas params row

537select selection tabexpr = UnsafeQuery $

490select selection tabexpr = UnsafeQuery $

@@ -539,24 +492,20 @@ select selection tabexpr = UnsafeQuery $

539 <+> renderSQL selection

492 <+> renderSQL selection

540 <+> renderSQL tabexpr

493 <+> renderSQL tabexpr

541

494

542−-- | Like `select` but takes an `NP` list of `Expression`s instead

543−-- of a general `Selection`.

544select_

495select_

545 :: (SListI row, row ~ (x ': xs))

496 :: (SListI row, row ~ (x ': xs))

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

497+ => NP (Aliased (Expression outer grp commons schemas params from)) row

547− -- ^ select list

548− -> TableExpression outer commons grp schemas params from

498+ -> TableExpression outer grp commons schemas params from

549− -- ^ intermediate virtual table

550 -> Query outer commons schemas params row

499 -> Query outer commons schemas params row

551−select_ = select . List

500+select_ list = select (List list)

552

501

553-- | After the select list has been processed, the result table can

502-- | After the select list has been processed, the result table can

554-- be subject to the elimination of duplicate rows using `selectDistinct`.

503-- be subject to the elimination of duplicate rows using `selectDistinct`.

555selectDistinct

504selectDistinct

556 :: (SListI columns, columns ~ (col ': cols))

505 :: (SListI columns, columns ~ (col ': cols))

557− => Selection outer commons grp schemas params from columns

506+ => Selection outer 'Ungrouped commons schemas params from columns

558− -- ^ selection

507+ -- ^ select list

559− -> TableExpression outer commons grp schemas params from

508+ -> TableExpression outer 'Ungrouped commons schemas params from

560 -- ^ intermediate virtual table

509 -- ^ intermediate virtual table

561 -> Query outer commons schemas params columns

510 -> Query outer commons schemas params columns

562selectDistinct selection tabexpr = UnsafeQuery $

511selectDistinct selection tabexpr = UnsafeQuery $

@@ -564,65 +513,14 @@ selectDistinct selection tabexpr = UnsafeQuery $

564 <+> renderSQL selection

513 <+> renderSQL selection

565 <+> renderSQL tabexpr

514 <+> renderSQL tabexpr

566

515

567−-- | Like `selectDistinct` but takes an `NP` list of `Expression`s instead

568−-- of a general `Selection`.

569selectDistinct_

516selectDistinct_

570 :: (SListI columns, columns ~ (col ': cols))

517 :: (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

572 -- ^ select list

519 -- ^ select list

573− -> TableExpression outer commons grp schemas params from

520+ -> TableExpression outer 'Ungrouped commons schemas params from

574 -- ^ intermediate virtual table

521 -- ^ intermediate virtual table

575 -> Query outer commons schemas params columns

522 -> Query outer commons schemas params columns

576−selectDistinct_ = selectDistinct . List

523+selectDistinct_ list = select (List 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

598− -- ^ intermediate virtual table

599− -> 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

626

524

627-- | `values` computes a row value or set of row values

525-- | `values` computes a row value or set of row values

628-- specified by value expressions. It is most commonly used

526-- specified by value expressions. It is most commonly used

@@ -635,8 +533,8 @@ selectDistinctOn_ distincts = selectDistinctOn distincts . List

635-- SELECT * FROM (VALUES (1, E'one')) AS t ("a", "b")

533-- SELECT * FROM (VALUES (1, E'one')) AS t ("a", "b")

636values

534values

637 :: SListI cols

535 :: SListI cols

638− => NP (Aliased (Expression outer commons 'Ungrouped schemas params '[] )) cols

536+ => NP (Aliased (Expression outer 'Ungrouped commons schemas params '[] )) cols

639− -> [NP (Aliased (Expression outer commons 'Ungrouped schemas params '[] )) cols]

537+ -> [NP (Aliased (Expression outer 'Ungrouped commons schemas params '[] )) cols]

640 -- ^ When more than one row is specified, all the rows must

538 -- ^ When more than one row is specified, all the rows must

641 -- must have the same number of elements

539 -- must have the same number of elements

642 -> Query outer commons schemas params cols

540 -> Query outer commons schemas params cols

@@ -650,7 +548,7 @@ values rw rws = UnsafeQuery $ "SELECT * FROM"

650 <+> parenthesized (renderCommaSeparated renderAliasPart rw)

548 <+> parenthesized (renderCommaSeparated renderAliasPart rw)

651 where

549 where

652 renderAliasPart, renderValuePart

550 renderAliasPart, renderValuePart

653− :: Aliased (Expression outer commons 'Ungrouped schemas params '[] ) ty -> ByteString

551+ :: Aliased (Expression outer 'Ungrouped commons schemas params '[] ) ty -> ByteString

654 renderAliasPart (_ `As` name) = renderSQL name

552 renderAliasPart (_ `As` name) = renderSQL name

655 renderValuePart (value `As` _) = renderSQL value

553 renderValuePart (value `As` _) = renderSQL value

656

554

@@ -658,7 +556,7 @@ values rw rws = UnsafeQuery $ "SELECT * FROM"

658-- specified by value expressions.

556-- specified by value expressions.

659values_

557values_

660 :: SListI cols

558 :: SListI cols

661− => NP (Aliased (Expression outer commons 'Ungrouped schemas params '[] )) cols

559+ => NP (Aliased (Expression outer 'Ungrouped commons schemas params '[] )) cols

662 -- ^ one row of values

560 -- ^ one row of values

663 -> Query outer commons schemas params cols

561 -> Query outer commons schemas params cols

664values_ rw = values rw []

562values_ rw = values rw []

@@ -675,8 +573,8 @@ Table Expressions

675-- can be used to modify or combine base tables in various ways.

573-- can be used to modify or combine base tables in various ways.

676data TableExpression

574data TableExpression

677 (outer :: FromType)

575 (outer :: FromType)

678− (commons :: FromType)

679 (grp :: Grouping)

576 (grp :: Grouping)

577+ (commons :: FromType)

680 (schemas :: SchemasType)

578 (schemas :: SchemasType)

681 (params :: [NullityType])

579 (params :: [NullityType])

682 (from :: FromType)

580 (from :: FromType)

@@ -684,7 +582,7 @@ data TableExpression

684 { fromClause :: FromClause outer commons schemas params from

582 { fromClause :: FromClause outer commons schemas params from

685 -- ^ A table reference that can be a table name, or a derived table such

583 -- ^ A table reference that can be a table name, or a derived table such

686 -- as a subquery, a @JOIN@ construct, or complex combinations of these.

584 -- 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]

688 -- ^ optional search coditions, combined with `.&&`. After the processing

586 -- ^ optional search coditions, combined with `.&&`. After the processing

689 -- of the `fromClause` is done, each row of the derived virtual table

587 -- of the `fromClause` is done, each row of the derived virtual table

690 -- is checked against the search condition. If the result of the

588 -- is checked against the search condition. If the result of the

@@ -700,13 +598,13 @@ data TableExpression

700 -- set of rows having common values into one group row that represents all

598 -- set of rows having common values into one group row that represents all

701 -- rows in the group. This is done to eliminate redundancy in the output

599 -- rows in the group. This is done to eliminate redundancy in the output

702 -- and/or compute aggregates that apply to these groups.

600 -- 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

704 -- ^ If a table has been grouped using `groupBy`, but only certain groups

602 -- ^ If a table has been grouped using `groupBy`, but only certain groups

705 -- are of interest, the `havingClause` can be used, much like a

603 -- are of interest, the `havingClause` can be used, much like a

706 -- `whereClause`, to eliminate groups from the result. Expressions in the

604 -- `whereClause`, to eliminate groups from the result. Expressions in the

707 -- `havingClause` can refer both to grouped expressions and to ungrouped

605 -- `havingClause` can refer both to grouped expressions and to ungrouped

708 -- expressions (which necessarily involve an aggregate function).

606 -- 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]

710 -- ^ The `orderByClause` is for optional sorting. When more than one

608 -- ^ The `orderByClause` is for optional sorting. When more than one

711 -- `SortExpression` is specified, the later (right) values are used to sort

609 -- `SortExpression` is specified, the later (right) values are used to sort

712 -- rows that are equal according to the earlier (left) values.

610 -- rows that are equal according to the earlier (left) values.

@@ -723,7 +621,7 @@ data TableExpression

723 } deriving (GHC.Generic)

621 } deriving (GHC.Generic)

724

622

725-- | Render a `TableExpression`

623-- | 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

727 renderSQL

625 renderSQL

728 (TableExpression frm' whs' grps' hvs' srts' lims' offs') = mconcat

626 (TableExpression frm' whs' grps' hvs' srts' lims' offs') = mconcat

729 [ "FROM ", renderSQL frm'

627 [ "FROM ", renderSQL frm'

@@ -756,29 +654,29 @@ instance RenderSQL (TableExpression outer commons grp schemas params from) where

756-- to match the left-to-right sequencing of their placement in SQL.

654-- to match the left-to-right sequencing of their placement in SQL.

757from

655from

758 :: FromClause outer commons schemas params from -- ^ table reference

656 :: FromClause outer commons schemas params from -- ^ table reference

759− -> TableExpression outer commons 'Ungrouped schemas params from

657+ -> TableExpression outer 'Ungrouped commons schemas params from

760−from tab = TableExpression tab [] noGroups NoHaving [] [] []

658+from tab = TableExpression tab [] NoGroups NoHaving [] [] []

761

659

762-- | A `where_` is an endomorphism of `TableExpression`s which adds a

660-- | A `where_` is an endomorphism of `TableExpression`s which adds a

763-- search condition to the `whereClause`.

661-- search condition to the `whereClause`.

764where_

662where_

765− :: Condition outer commons 'Ungrouped schemas params from -- ^ filtering condition

663+ :: Condition outer 'Ungrouped commons schemas params from -- ^ filtering condition

766− -> TableExpression outer commons grp schemas params from

664+ -> TableExpression outer grp commons schemas params from

767− -> TableExpression outer commons grp schemas params from

665+ -> TableExpression outer grp commons schemas params from

768where_ wh rels = rels {whereClause = wh : whereClause rels}

666where_ wh rels = rels {whereClause = wh : whereClause rels}

769

667

770-- | A `groupBy` is a transformation of `TableExpression`s which switches

668-- | 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

772-- a "grand total" aggregation query.

670-- a "grand total" aggregation query.

773groupBy

671groupBy

774 :: SListI bys

672 :: SListI bys

775 => NP (By from) bys -- ^ grouped columns

673 => NP (By from) bys -- ^ grouped columns

776− -> TableExpression outer commons 'Ungrouped schemas params from

674+ -> TableExpression outer 'Ungrouped commons schemas params from

777− -> TableExpression outer commons ('Grouped bys) schemas params from

675+ -> TableExpression outer ('Grouped bys) commons schemas params from

778groupBy bys rels = TableExpression

676groupBy bys rels = TableExpression

779 { fromClause = fromClause rels

677 { fromClause = fromClause rels

780 , whereClause = whereClause rels

678 , whereClause = whereClause rels

781− , groupByClause = group bys

679+ , groupByClause = Group bys

782 , havingClause = Having []

680 , havingClause = Having []

783 , orderByClause = []

681 , orderByClause = []

784 , limitClause = limitClause rels

682 , limitClause = limitClause rels

@@ -788,9 +686,9 @@ groupBy bys rels = TableExpression

788-- | A `having` is an endomorphism of `TableExpression`s which adds a

686-- | A `having` is an endomorphism of `TableExpression`s which adds a

789-- search condition to the `havingClause`.

687-- search condition to the `havingClause`.

790having

688having

791− :: Condition outer commons ('Grouped bys) schemas params from -- ^ having condition

689+ :: Condition outer ('Grouped bys) commons schemas params from -- ^ having condition

792− -> TableExpression outer commons ('Grouped bys) schemas params from

690+ -> TableExpression outer ('Grouped bys) commons schemas params from

793− -> TableExpression outer commons ('Grouped bys) schemas params from

691+ -> TableExpression outer ('Grouped bys) commons schemas params from

794having hv rels = rels

692having hv rels = rels

795 { havingClause = case havingClause rels of Having hvs -> Having (hv:hvs) }

693 { havingClause = case havingClause rels of Having hvs -> Having (hv:hvs) }

796

694

@@ -801,18 +699,182 @@ instance OrderBy TableExpression where

801-- `limitClause`.

699-- `limitClause`.

802limit

700limit

803 :: Word64 -- ^ limit parameter

701 :: Word64 -- ^ limit parameter

804− -> TableExpression outer commons grp schemas params from

702+ -> TableExpression outer grp commons schemas params from

805− -> TableExpression outer commons grp schemas params from

703+ -> TableExpression outer grp commons schemas params from

806limit lim rels = rels {limitClause = lim : limitClause rels}

704limit lim rels = rels {limitClause = lim : limitClause rels}

807

705

808-- | An `offset` is an endomorphism of `TableExpression`s which adds to the

706-- | An `offset` is an endomorphism of `TableExpression`s which adds to the

809-- `offsetClause`.

707-- `offsetClause`.

810offset

708offset

811 :: Word64 -- ^ offset parameter

709 :: Word64 -- ^ offset parameter

812− -> TableExpression outer commons grp schemas params from

710+ -> TableExpression outer grp commons schemas params from

813− -> TableExpression outer commons grp schemas params from

711+ -> TableExpression outer grp commons schemas params from

814offset off rels = rels {offsetClause = off : offsetClause rels}

712offset off rels = rels {offsetClause = off : offsetClause rels}

815

713

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+

816{-----------------------------------------

878{-----------------------------------------

817FROM clauses

879FROM clauses

818-----------------------------------------}

880-----------------------------------------}

@@ -839,7 +901,7 @@ table (tab `As` alias) = UnsafeFromClause $

839subquery

901subquery

840 :: Aliased (Query outer commons schemas params) query

902 :: Aliased (Query outer commons schemas params) query

841 -> FromClause outer commons schemas params '[query]

903 -> FromClause outer commons schemas params '[query]

842−subquery = UnsafeFromClause . renderAliased (parenthesized . renderSQL)

904+subquery = UnsafeFromClause . renderAliased (parenthesized . renderQuery)

843

905

844-- | `view` derives a table from a `View`.

906-- | `view` derives a table from a `View`.

845view

907view

@@ -857,16 +919,11 @@ common

857common (cte `As` alias) = UnsafeFromClause $

919common (cte `As` alias) = UnsafeFromClause $

858 renderSQL cte <+> "AS" <+> renderSQL alias

920 renderSQL cte <+> "AS" <+> renderSQL alias

859

921

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

922+{- | @left & crossJoin right@. For every possible combination of rows from

866−@left@ and @right@ (i.e., a Cartesian product), the joined table will contain

923+ @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@.

924+ 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

925+ If the tables have @n@ and @m@ rows respectively, the joined table will

869−have @n * m@ rows.

926+ have @n * m@ rows.

870-}

927-}

871crossJoin

928crossJoin

872 :: FromClause outer commons schemas params right

929 :: FromClause outer commons schemas params right

@@ -883,7 +940,7 @@ the @on@ condition.

883innerJoin

940innerJoin

884 :: FromClause outer commons schemas params right

941 :: FromClause outer commons schemas params right

885 -- ^ right

942 -- ^ right

886− -> Condition outer commons 'Ungrouped schemas params (Join left right)

943+ -> Condition outer 'Ungrouped commons schemas params (Join left right)

887 -- ^ @on@ condition

944 -- ^ @on@ condition

888 -> FromClause outer commons schemas params left

945 -> FromClause outer commons schemas params left

889 -- ^ left

946 -- ^ left

@@ -900,7 +957,7 @@ innerJoin right on left = UnsafeFromClause $

900leftOuterJoin

957leftOuterJoin

901 :: FromClause outer commons schemas params right

958 :: FromClause outer commons schemas params right

902 -- ^ right

959 -- ^ right

903− -> Condition outer commons 'Ungrouped schemas params (Join left right)

960+ -> Condition outer 'Ungrouped commons schemas params (Join left right)

904 -- ^ @on@ condition

961 -- ^ @on@ condition

905 -> FromClause outer commons schemas params left

962 -> FromClause outer commons schemas params left

906 -- ^ left

963 -- ^ left

@@ -918,7 +975,7 @@ leftOuterJoin right on left = UnsafeFromClause $

918rightOuterJoin

975rightOuterJoin

919 :: FromClause outer commons schemas params right

976 :: FromClause outer commons schemas params right

920 -- ^ right

977 -- ^ right

921− -> Condition outer commons 'Ungrouped schemas params (Join left right)

978+ -> Condition outer 'Ungrouped commons schemas params (Join left right)

922 -- ^ @on@ condition

979 -- ^ @on@ condition

923 -> FromClause outer commons schemas params left

980 -> FromClause outer commons schemas params left

924 -- ^ left

981 -- ^ left

@@ -937,7 +994,7 @@ rightOuterJoin right on left = UnsafeFromClause $

937fullOuterJoin

994fullOuterJoin

938 :: FromClause outer commons schemas params right

995 :: FromClause outer commons schemas params right

939 -- ^ right

996 -- ^ right

940− -> Condition outer commons 'Ungrouped schemas params (Join left right)

997+ -> Condition outer 'Ungrouped commons schemas params (Join left right)

941 -- ^ @on@ condition

998 -- ^ @on@ condition

942 -> FromClause outer commons schemas params left

999 -> FromClause outer commons schemas params left

943 -- ^ left

1000 -- ^ left

@@ -992,42 +1049,125 @@ instance (Has rel rels cols, Has col cols ty, bys ~ '[ '(rel, col)])

992-- done on @NoGroups@ while all output `Expression`s must be aggregated

1049-- done on @NoGroups@ while all output `Expression`s must be aggregated

993-- in @Group Nil@. In general, all output `Expression`s in the

1050-- in @Group Nil@. In general, all output `Expression`s in the

994-- complement of @bys@ must be aggregated in @Group bys@.

1051-- complement of @bys@ must be aggregated in @Group bys@.

995−newtype GroupByClause grp from = UnsafeGroupByClause

1052+data GroupByClause grp from where

996− { renderGroupByClause :: ByteString }

1053+ NoGroups :: GroupByClause 'Ungrouped from

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

1054+ Group

1055+ :: SListI bys

1056+ => NP (By from) bys

1057+ -> GroupByClause ('Grouped bys) from

1058+

1059+-- | Renders a `GroupByClause`.

998instance RenderSQL (GroupByClause grp from) where

1060instance RenderSQL (GroupByClause grp from) where

999− renderSQL = renderGroupByClause

1061+ renderSQL = \case

1000−noGroups :: GroupByClause 'Ungrouped from

1062+ NoGroups -> ""

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 -> ""

1063+ Group Nil -> ""

1008− bys' -> " GROUP BY" <+> renderCommaSeparated renderSQL bys'

1064+ Group bys -> " GROUP BY" <+> renderCommaSeparated renderSQL bys

1009

1065

1010-- | A `HavingClause` is used to eliminate groups that are not of interest.

1066-- | A `HavingClause` is used to eliminate groups that are not of interest.

1011-- An `Ungrouped` `TableExpression` may only use `NoHaving` while a `Grouped`

1067-- An `Ungrouped` `TableExpression` may only use `NoHaving` while a `Grouped`

1012-- `TableExpression` must use `Having` whose conditions are combined with

1068-- `TableExpression` must use `Having` whose conditions are combined with

1013-- `.&&`.

1069-- `.&&`.

1014−data HavingClause outer commons grp schemas params from where

1070+data HavingClause outer grp commons schemas params from where

1015− NoHaving :: HavingClause outer commons 'Ungrouped schemas params from

1071+ NoHaving :: HavingClause outer 'Ungrouped commons schemas params from

1016 Having

1072 Having

1017− :: [Condition outer commons ('Grouped bys) schemas params from]

1073+ :: [Condition outer ('Grouped bys) commons schemas params from]

1018− -> HavingClause outer commons ('Grouped bys) schemas params from

1074+ -> HavingClause outer ('Grouped bys) commons schemas params from

1019−deriving instance Show (HavingClause outer commons grp schemas params from)

1075+deriving instance Show (HavingClause outer grp commons schemas params from)

1020−deriving instance Eq (HavingClause outer commons grp schemas params from)

1076+deriving instance Eq (HavingClause outer grp commons schemas params from)

1021−deriving instance Ord (HavingClause outer commons grp schemas params from)

1077+deriving instance Ord (HavingClause outer grp commons schemas params from)

1022

1078

1023-- | Render a `HavingClause`.

1079-- | Render a `HavingClause`.

1024−instance RenderSQL (HavingClause outer commons grp schemas params from) where

1080+instance RenderSQL (HavingClause outer grp commons schemas params from) where

1025 renderSQL = \case

1081 renderSQL = \case

1026 NoHaving -> ""

1082 NoHaving -> ""

1027 Having [] -> ""

1083 Having [] -> ""

1028 Having conditions ->

1084 Having conditions ->

1029 " HAVING" <+> commaSeparated (renderSQL <$> conditions)

1085 " HAVING" <+> commaSeparated (renderSQL <$> conditions)

1030

1086

1087+{- |

1088+The argument of `exists` is an arbitrary subquery. The subquery is evaluated

1089+to determine whether it returns any rows. If it returns at least one row,

1090+the result of `exists` is `true`; if the subquery returns no rows,

1091+the result of `exists` is `false`.

1092+

1093+The subquery can refer to variables from the surrounding query,

1094+which will act as constants during any one evaluation of the subquery.

1095+

1096+The subquery will generally only be executed long enough to determine whether

1097+at least one row is returned, not all the way to completion.

1098+-}

1099+exists

1100+ :: Query (Join outer from) commons schemas params row

1101+ -> Condition outer grp commons schemas params from

1102+exists query = UnsafeExpression $ "EXISTS" <+> parenthesized (renderSQL query)

1103+

1104+{- |

1105+The right-hand side is a parenthesized subquery, which must return

1106+exactly one column. The left-hand expression is evaluated and compared to each

1107+row of the subquery result using the given `Operator`,

1108+which must yield a Boolean result. The result of `subAll` is `true`

1109+if all rows yield true (including the case where the subquery returns no rows).

1110+The result is `false` if any `false` result is found.

1111+The result is `null_` if no comparison with a subquery row returns `false`,

1112+and at least one comparison returns `null_`.

1113+

1114+>>> printSQL $ subAll true (.==) (values_ (true `as` #foo))

1115+(TRUE = ALL (SELECT * FROM (VALUES (TRUE)) AS t ("foo")))

1116+-}

1117+subAll

1118+ :: Expression outer grp commons schemas params from ty1 -- ^ expression

1119+ -> Operator ty1 ty2 ('Null 'PGbool) -- ^ operator

1120+ -> Query (Join outer from) commons schemas params '[col ::: ty2] -- ^ subquery

1121+ -> Condition outer grp commons schemas params from

1122+subAll expr (?) qry = expr ?

1123+ (UnsafeExpression $ "ALL" <+> parenthesized (renderSQL qry))

1124+

1125+{- |

1126+The right-hand side is a parenthesized subquery, which must return exactly one column.

1127+The left-hand expression is evaluated and compared to each row of the subquery result

1128+using the given `Operator`, which must yield a Boolean result. The result of `subAny` is `true`

1129+if any `true` result is obtained. The result is `false` if no true result is found

1130+(including the case where the subquery returns no rows).

1131+

1132+>>> printSQL $ subAll "foo" like (values_ ("foobar" `as` #foo))

1133+(E'foo' LIKE ALL (SELECT * FROM (VALUES (E'foobar')) AS t ("foo")))

1134+-}

1135+subAny

1136+ :: Expression outer grp commons schemas params from ty1 -- ^ expression

1137+ -> Operator ty1 ty2 ('Null 'PGbool) -- ^ operator

1138+ -> Query (Join outer from) commons schemas params '[col ::: ty2] -- ^ subquery

1139+ -> Condition outer grp commons schemas params from

1140+subAny expr (?) qry = expr ?

1141+ (UnsafeExpression $ "ANY" <+> parenthesized (renderSQL qry))

1142+

1143+{- |

1144+The result is `true` if the left-hand expression's result is equal

1145+to any of the right-hand expressions.

1146+

1147+>>> printSQL $ true `in_` [true, false, null_]

1148+TRUE IN (TRUE, FALSE, NULL)

1149+-}

1150+in_

1151+ :: Expression outer grp commons schemas params from ty -- ^ expression

1152+ -> [Expression outer grp commons schemas params from ty]

1153+ -> Condition outer grp commons schemas params from

1154+expr `in_` exprs = UnsafeExpression $ renderSQL expr <+> "IN"

1155+ <+> parenthesized (commaSeparated (renderSQL <$> exprs))

1156+

1157+{- |

1158+The result is `true` if the left-hand expression's result is not equal

1159+to any of the right-hand expressions.

1160+

1161+>>> printSQL $ true `notIn` [false, null_]

1162+TRUE NOT IN (FALSE, NULL)

1163+-}

1164+notIn

1165+ :: Expression outer grp commons schemas params from ty -- ^ expression

1166+ -> [Expression outer grp commons schemas params from ty]

1167+ -> Condition outer grp commons schemas params from

1168+expr `notIn` exprs = UnsafeExpression $ renderSQL expr <+> "NOT IN"

1169+ <+> parenthesized (commaSeparated (renderSQL <$> exprs))

1170+

1031-- | A `CommonTableExpression` is an auxiliary statement in a `with` clause.

1171-- | A `CommonTableExpression` is an auxiliary statement in a `with` clause.

1032data CommonTableExpression statement

1172data CommonTableExpression statement

1033 (schemas :: SchemasType)

1173 (schemas :: SchemasType)

@@ -1049,8 +1189,8 @@ instance

1049 , commons1 ~ (cte ::: common ': commons)

1189 , commons1 ~ (cte ::: common ': commons)

1050 ) => Aliasable cte

1190 ) => Aliasable cte

1051 (statement commons schemas params common)

1191 (statement commons schemas params common)

1052− (Path (CommonTableExpression statement schemas params) commons commons1) where

1192+ (AlignedList (CommonTableExpression statement schemas params) commons commons1) where

1053− statement `as` cte = csingleton (statement `as` cte)

1193+ statement `as` cte = single (statement `as` cte)

1054

1194

1055instance (forall c s p r. RenderSQL (statement c s p r)) => RenderSQL

1195instance (forall c s p r. RenderSQL (statement c s p r)) => RenderSQL

1056 (CommonTableExpression statement schemas params commons0 commons1) where

1196 (CommonTableExpression statement schemas params commons0 commons1) where

@@ -1062,7 +1202,7 @@ instance (forall c s p r. RenderSQL (statement c s p r)) => RenderSQL

1062-- defining temporary tables that exist just for one query.

1202-- defining temporary tables that exist just for one query.

1063class With statement where

1203class With statement where

1064 with

1204 with

1065− :: Path (CommonTableExpression statement schemas params) commons0 commons1

1205+ :: AlignedList (CommonTableExpression statement schemas params) commons0 commons1

1066 -- ^ common table expressions

1206 -- ^ common table expressions

1067 -> statement commons1 schemas params row

1207 -> statement commons1 schemas params row

1068 -- ^ larger query

1208 -- ^ larger query

@@ -1070,29 +1210,4 @@ class With statement where

1070instance With (Query outer) where

1210instance With (Query outer) where

1071 with Done query = query

1211 with Done query = query

1072 with ctes query = UnsafeQuery $

1212 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

1213+ "WITH" <+> renderSQL ctes <+> renderSQL query

squeal-postgresql/src/Squeal/PostgreSQL/Render.hs+6−39

@@ -10,37 +10,31 @@ Rendering helper functions.

11{-# LANGUAGE

12 AllowAmbiguousTypes

13− , ConstraintKinds

14 , FlexibleContexts

13 , FlexibleContexts

15− , LambdaCase

16 , MagicHash

14 , MagicHash

17 , OverloadedStrings

15 , OverloadedStrings

18 , PolyKinds

16 , PolyKinds

19 , RankNTypes

17 , RankNTypes

20 , ScopedTypeVariables

18 , ScopedTypeVariables

21− , TypeApplications

22#-}

19#-}

24module Squeal.PostgreSQL.Render

21module Squeal.PostgreSQL.Render

25 ( -- * Render

22 ( -- * Render

26− RenderSQL (..)

27− , printSQL

28− , escape

29− , parenthesized

23+ parenthesized

30− , bracketed

31 , (<+>)

24 , (<+>)

32 , commaSeparated

25 , commaSeparated

33 , doubleQuoted

26 , doubleQuoted

34 , singleQuotedText

27 , singleQuotedText

35 , singleQuotedUtf8

28 , singleQuotedUtf8

36 , renderCommaSeparated

29 , renderCommaSeparated

37− , renderCommaSeparatedConstraint

38 , renderCommaSeparatedMaybe

30 , renderCommaSeparatedMaybe

39 , renderNat

31 , renderNat

40 , renderSymbol

32 , renderSymbol

33+ , RenderSQL (..)

34+ , printSQL

41 ) where

35 ) where

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

37+import Control.Monad.Base

44import Data.ByteString (ByteString)

38import Data.ByteString (ByteString)

45import Data.Maybe (catMaybes)

39import Data.Maybe (catMaybes)

46import Data.Monoid ((<>))

40import Data.Monoid ((<>))

@@ -58,10 +52,6 @@ import qualified Data.ByteString.Char8 as Char8

58parenthesized :: ByteString -> ByteString

52parenthesized :: ByteString -> ByteString

59parenthesized str = "(" <> str <> ")"

53parenthesized str = "(" <> str <> ")"

61−-- | Square bracket a `ByteString`

62−bracketed :: ByteString -> ByteString

63−bracketed str = "[" <> str <> "]"

64−

65-- | Concatenate two `ByteString`s with a space between.

55-- | Concatenate two `ByteString`s with a space between.

66(<+>) :: ByteString -> ByteString -> ByteString

56(<+>) :: ByteString -> ByteString -> ByteString

67infixr 7 <+>

57infixr 7 <+>

@@ -94,16 +84,6 @@ renderCommaSeparated render

94 . hcollapse

84 . hcollapse

95 . hmap (K . render)

85 . hmap (K . render)

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−

107-- | Comma separate the `Maybe` renderings of a heterogeneous list, dropping

87-- | Comma separate the `Maybe` renderings of a heterogeneous list, dropping

108-- `Nothing`s.

88-- `Nothing`s.

109renderCommaSeparatedMaybe

89renderCommaSeparatedMaybe

@@ -128,18 +108,5 @@ renderSymbol = fromString (symbolVal' (proxy# :: Proxy# s))

128class RenderSQL sql where renderSQL :: sql -> ByteString

108class RenderSQL sql where renderSQL :: sql -> ByteString

129

109

130-- | Print SQL.

110-- | Print SQL.

131−printSQL :: (RenderSQL sql, MonadIO io) => sql -> io ()

111+printSQL :: (RenderSQL sql, MonadBase IO io) => sql -> io ()

132−printSQL = liftIO . Char8.putStrLn . renderSQL

112+printSQL = liftBase . 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]

squeal-postgresql/src/Squeal/PostgreSQL/Schema.hs+372−180

@@ -1,15 +1,16 @@

1{-|

2Module: Squeal.PostgreSQL.Schema

3Description: Embedding of PostgreSQL type and alias system

4−Copyright: (c) Eitan Chatav, 2019

4+Copyright: (c) Eitan Chatav, 2017

5Maintainer: eitan@morphism.tech

6Stability: 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,

9tables, schema, constraints, aliases, enumerated labels, and groupings.

10It also defines useful type families to operate on these. Finally,

11it defines an embedding of Haskell types into Postgres types.

12-}

13+{-# OPTIONS_GHC -fno-warn-unticked-promoted-constructors #-}

13{-# LANGUAGE

14{-# LANGUAGE

14 AllowAmbiguousTypes

15 AllowAmbiguousTypes

15 , ConstraintKinds

16 , ConstraintKinds

@@ -44,10 +45,6 @@ module Squeal.PostgreSQL.Schema

44 , ColumnsType

45 , ColumnsType

45 , TableType

46 , TableType

46 , SchemumType (..)

47 , SchemumType (..)

47− , IndexType (..)

48− , FunctionType

49− , OperatorType (..)

50− , ReturnsType (..)

51 , SchemaType

48 , SchemaType

52 , SchemasType

49 , SchemasType

53 , Public

50 , Public

@@ -57,30 +54,52 @@ module Squeal.PostgreSQL.Schema

57 , TableConstraint (..)

54 , TableConstraint (..)

58 , TableConstraints

55 , TableConstraints

59 , Uniquely

56 , 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 (..)

60 -- * Enumerated Labels

73 -- * Enumerated Labels

61 , IsPGlabel (..)

74 , IsPGlabel (..)

62 , PGlabel (..)

75 , PGlabel (..)

76+ -- * Grouping

77+ , Grouping (..)

78+ , GroupedBy

79+ -- * Aligned lists

80+ , AlignedList (..)

81+ , single

63 -- * Data Definitions

82 -- * Data Definitions

64 , Create

83 , Create

65− , CreateIfNotExists

66− , CreateOrReplace

67 , Drop

84 , Drop

68− , DropSchemum

69− , DropIfExists

70− , DropSchemumIfExists

71 , Alter

85 , Alter

72− , AlterIfExists

73 , Rename

86 , Rename

74− , RenameIfExists

75− , ConstraintInvolves

76 , DropIfConstraintsInvolve

87 , DropIfConstraintsInvolve

77− , IsNotElem

88+ -- * Lists

78− , AllUnique

89+ , Join

90+ , disjoin

91+ , Elem

92+ , In

93+ , Length

79 -- * Type Classifications

94 -- * Type Classifications

95+ , HasOid (..)

80 , PGNum

96 , PGNum

81 , PGIntegral

97 , PGIntegral

82 , PGFloating

98 , PGFloating

83 , PGTypeOf

99 , PGTypeOf

100+ , PGArrayOf

101+ , PGArray

102+ , PGTextArray

84 , PGJsonType

103 , PGJsonType

85 , PGJsonKey

104 , PGJsonKey

86 , SamePGType

105 , SamePGType

@@ -97,22 +116,25 @@ module Squeal.PostgreSQL.Schema

97 ) where

116 ) where

117

99import Control.Category

118import Control.Category

119+import Control.DeepSeq

120+import Data.ByteString (ByteString)

100import Data.Kind

121import Data.Kind

101import Data.Monoid hiding (All)

122import Data.Monoid hiding (All)

123+import Data.String

102import Data.Type.Bool

124import Data.Type.Bool

125+import Data.Word (Word32)

103import Generics.SOP

126import Generics.SOP

127+import GHC.OverloadedLabels

104import GHC.TypeLits

128import GHC.TypeLits

105import Prelude hiding (id, (.))

129import Prelude hiding (id, (.))

106

130

107−import Squeal.PostgreSQL.Alias

131+import qualified GHC.Generics as GHC

108−import Squeal.PostgreSQL.List

109−import Squeal.PostgreSQL.Render

110

132

111−-- $setup

112−-- >>> import Squeal.PostgreSQL

133+import Squeal.PostgreSQL.Render

113

134

114-- | `PGType` is the promoted datakind of PostgreSQL types.

135-- | `PGType` is the promoted datakind of PostgreSQL types.

115--

136--

137+-- >>> import Squeal.PostgreSQL.Schema

116-- >>> :kind 'PGbool

138-- >>> :kind 'PGbool

117-- 'PGbool :: PGType

139-- 'PGbool :: PGType

118data PGType

140data PGType

@@ -143,11 +165,37 @@ data PGType

143 | PGenum [Symbol] -- ^ enumerated (enum) types are data types that comprise a static, ordered set of values.

165 | PGenum [Symbol] -- ^ enumerated (enum) types are data types that comprise a static, ordered set of values.

144 | 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.

166 | 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.

145 | 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.

167 | 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.

168+ | 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).

149 | UnsafePGType Symbol -- ^ an escape hatch for unsupported PostgreSQL types

169 | UnsafePGType Symbol -- ^ an escape hatch for unsupported PostgreSQL types

150

170

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+

151-- | `NullityType` encodes the potential presence or definite absence of a

199-- | `NullityType` encodes the potential presence or definite absence of a

152-- @NULL@ allowing operations which are sensitive to such to be well typed.

200-- @NULL@ allowing operations which are sensitive to such to be well typed.

153--

201--

@@ -166,6 +214,11 @@ data NullityType

166type (:=>) constraint ty = '(constraint,ty)

214type (:=>) constraint ty = '(constraint,ty)

167infixr 7 :=>

215infixr 7 :=>

168

216

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+

169-- | `ColumnConstraint` encodes the availability of @DEFAULT@ for inserts and updates.

222-- | `ColumnConstraint` encodes the availability of @DEFAULT@ for inserts and updates.

170-- A column can be assigned a default value.

223-- A column can be assigned a default value.

171-- A data `Squeal.PostgreSQL.Manipulations.Manipulation` command can also

224-- A data `Squeal.PostgreSQL.Manipulations.Manipulation` command can also

@@ -260,19 +313,9 @@ type FromType = [(Symbol,RowType)]

260

313

261-- | `ColumnsToRow` removes column constraints.

314-- | `ColumnsToRow` removes column constraints.

262type family ColumnsToRow (columns :: ColumnsType) :: RowType where

315type 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

275 ColumnsToRow '[] = '[]

316 ColumnsToRow '[] = '[]

317+ ColumnsToRow (column ::: constraint :=> ty ': columns) =

318+ column ::: ty ': ColumnsToRow columns

276

319

277-- | `TableToColumns` removes table constraints.

320-- | `TableToColumns` removes table constraints.

278type family TableToColumns (table :: TableType) :: ColumnsType where

321type family TableToColumns (table :: TableType) :: ColumnsType where

@@ -282,6 +325,212 @@ type family TableToColumns (table :: TableType) :: ColumnsType where

282type family TableToRow (table :: TableType) :: RowType where

325type family TableToRow (table :: TableType) :: RowType where

283 TableToRow tab = ColumnsToRow (TableToColumns tab)

326 TableToRow tab = ColumnsToRow (TableToColumns tab)

284

327

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+

285-- | Numeric Postgres types.

534-- | Numeric Postgres types.

286type PGNum =

535type PGNum =

287 '[ 'PGint2, 'PGint4, 'PGint8, 'PGnumeric, 'PGfloat4, 'PGfloat8]

536 '[ 'PGint2, 'PGint4, 'PGint8, 'PGnumeric, 'PGfloat4, 'PGfloat8]

@@ -292,6 +541,37 @@ type PGFloating = '[ 'PGfloat4, 'PGfloat8, 'PGnumeric]

292-- | Integral Postgres types.

541-- | Integral Postgres types.

293type PGIntegral = '[ 'PGint2, 'PGint4, 'PGint8]

542type PGIntegral = '[ 'PGint2, 'PGint4, 'PGint8]

294

543

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+

295-- | `PGTypeOf` forgets about @NULL@ and any column constraints.

575-- | `PGTypeOf` forgets about @NULL@ and any column constraints.

296type family PGTypeOf (ty :: NullityType) :: PGType where

576type family PGTypeOf (ty :: NullityType) :: PGType where

297 PGTypeOf (nullity pg) = pg

577 PGTypeOf (nullity pg) = pg

@@ -305,24 +585,14 @@ instance ty0 ~ ty1 => SamePGType

305

585

306-- | `AllNotNull` is a constraint that proves a `ColumnsType` has no @NULL@s.

586-- | `AllNotNull` is a constraint that proves a `ColumnsType` has no @NULL@s.

307type family AllNotNull (columns :: ColumnsType) :: Constraint where

587type 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

314 AllNotNull '[] = ()

588 AllNotNull '[] = ()

589+ AllNotNull (column ::: def :=> 'NotNull ty ': columns) = AllNotNull columns

315

590

316-- | `NotAllNull` is a constraint that proves a `ColumnsType` has some

591-- | `NotAllNull` is a constraint that proves a `ColumnsType` has some

317-- @NOT NULL@.

592-- @NOT NULL@.

318type family NotAllNull (columns :: ColumnsType) :: Constraint where

593type family NotAllNull (columns :: ColumnsType) :: Constraint where

319− NotAllNull (_ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> 'NotNull _ ': _) = ()

594+ NotAllNull (column ::: def :=> 'NotNull ty ': columns) = ()

320− NotAllNull (_ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> 'NotNull _ ': _) = ()

321− NotAllNull (_ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> 'NotNull _ ': _) = ()

322− NotAllNull (_ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> 'NotNull _ ': _) = ()

323− NotAllNull (_ ::: _ :=> _ _ ': _ ::: _ :=> 'NotNull _ ': _) = ()

324− NotAllNull (_ ::: _ :=> 'NotNull _ ': _) = ()

325− NotAllNull (_ ::: _ :=> 'Null _ ': columns) = NotAllNull columns

595+ NotAllNull (column ::: def :=> 'Null ty ': columns) = NotAllNull columns

326

596

327-- | `NullifyType` is an idempotent that nullifies a `NullityType`.

597-- | `NullifyType` is an idempotent that nullifies a `NullityType`.

328type family NullifyType (ty :: NullityType) :: NullityType where

598type family NullifyType (ty :: NullityType) :: NullityType where

@@ -331,37 +601,33 @@ type family NullifyType (ty :: NullityType) :: NullityType where

331

601

332-- | `NullifyRow` is an idempotent that nullifies a `RowType`.

602-- | `NullifyRow` is an idempotent that nullifies a `RowType`.

333type family NullifyRow (columns :: RowType) :: RowType where

603type family NullifyRow (columns :: RowType) :: RowType where

334− NullifyRow (column ::: ty ': column1 ::: ty1 ': column2 ::: ty2 ': column3 ::: ty3 ': column4 ::: ty4 ': column5 ::: ty5 ': columns) =

604+ NullifyRow '[] = '[]

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

344 NullifyRow (column ::: ty ': columns) =

605 NullifyRow (column ::: ty ': columns) =

345 column ::: NullifyType ty ': NullifyRow columns

606 column ::: NullifyType ty ': NullifyRow columns

346− NullifyRow '[] = '[]

347

607

348-- | `NullifyFrom` is an idempotent that nullifies a `FromType`

608-- | `NullifyFrom` is an idempotent that nullifies a `FromType`

349-- used to nullify the left or right hand side of an outer join

609-- used to nullify the left or right hand side of an outer join

350-- in a `Squeal.PostgreSQL.Query.FromClause`.

610-- in a `Squeal.PostgreSQL.Query.FromClause`.

351type family NullifyFrom (tables :: FromType) :: FromType where

611type family NullifyFrom (tables :: FromType) :: FromType where

352− NullifyFrom (table ::: columns ': table1 ::: columns1 ': table2 ::: columns2 ': table3 ::: columns3 ': table4 ::: columns4 ': table5 ::: columns5 ': tables) =

612+ NullifyFrom '[] = '[]

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

362 NullifyFrom (table ::: columns ': tables) =

613 NullifyFrom (table ::: columns ': tables) =

363 table ::: NullifyRow columns ': NullifyFrom tables

614 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)

365

631

366-- | @Create alias x xs@ adds @alias ::: x@ to the end of @xs@ and is used in

632-- | @Create alias x xs@ adds @alias ::: x@ to the end of @xs@ and is used in

367-- `Squeal.PostgreSQL.Definition.createTable` statements and in @ALTER TABLE@

633-- `Squeal.PostgreSQL.Definition.createTable` statements and in @ALTER TABLE@

@@ -371,101 +637,30 @@ type family Create alias x xs where

371 Create alias x (alias ::: y ': xs) = TypeError

637 Create alias x (alias ::: y ': xs) = TypeError

372 ('Text "Create: alias "

638 ('Text "Create: alias "

373 ':<>: 'ShowType alias

639 ':<>: 'ShowType alias

374− ':<>: 'Text "already exists")

640+ ':<>: 'Text "already in use")

375 Create alias y (x ': xs) = x ': Create alias y xs

641 Create alias y (x ': xs) = x ': Create alias y xs

376

642

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−

394-- | @Drop alias xs@ removes the type associated with @alias@ in @xs@

643-- | @Drop alias xs@ removes the type associated with @alias@ in @xs@

395-- and is used in `Squeal.PostgreSQL.Definition.dropTable` statements

644-- and is used in `Squeal.PostgreSQL.Definition.dropTable` statements

396-- and in @ALTER TABLE@ `Squeal.PostgreSQL.Definition.dropColumn` statements.

645-- and in @ALTER TABLE@ `Squeal.PostgreSQL.Definition.dropColumn` statements.

397type family Drop alias xs where

646type 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

403 Drop alias (x ': xs) = x ': Drop alias xs

648 Drop alias (x ': xs) = x ': Drop alias xs

404

649

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−

437-- | @Alter alias x xs@ replaces the type associated with an @alias@ in @xs@

650-- | @Alter alias x xs@ replaces the type associated with an @alias@ in @xs@

438-- with the type @x@ and is used in `Squeal.PostgreSQL.Definition.alterTable`

651-- with the type @x@ and is used in `Squeal.PostgreSQL.Definition.alterTable`

439-- and `Squeal.PostgreSQL.Definition.alterColumn`.

652-- and `Squeal.PostgreSQL.Definition.alterColumn`.

440type family Alter alias x xs where

653type family Alter alias x xs where

441− Alter alias x '[] = TypeError

442− ('Text "Alter: alias "

443− ':<>: 'ShowType alias

444− ':<>: 'Text " does not exist" )

445 Alter alias x1 (alias ::: x0 ': xs) = alias ::: x1 ': xs

654 Alter alias x1 (alias ::: x0 ': xs) = alias ::: x1 ': xs

446 Alter alias x1 (x0 ': xs) = x0 ': Alter alias x1 xs

655 Alter alias x1 (x0 ': xs) = x0 ': Alter alias x1 xs

447

656

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−

453-- | @Rename alias0 alias1 xs@ replaces the alias @alias0@ by @alias1@ in @xs@

657-- | @Rename alias0 alias1 xs@ replaces the alias @alias0@ by @alias1@ in @xs@

454-- and is used in `Squeal.PostgreSQL.Definition.alterTableRename` and

658-- and is used in `Squeal.PostgreSQL.Definition.alterTableRename` and

455-- `Squeal.PostgreSQL.Definition.renameColumn`.

659-- `Squeal.PostgreSQL.Definition.renameColumn`.

456type family Rename alias0 alias1 xs where

660type family Rename alias0 alias1 xs where

457− Rename alias0 alias1 '[] = TypeError

458− ('Text "Rename: alias "

459− ':<>: 'ShowType alias0

460− ':<>: 'Text " does not exist" )

461 Rename alias0 alias1 ((alias0 ::: x0) ': xs) = (alias1 ::: x0) ': xs

661 Rename alias0 alias1 ((alias0 ::: x0) ': xs) = (alias1 ::: x0) ': xs

462 Rename alias0 alias1 (x ': xs) = x ': Rename alias0 alias1 xs

662 Rename alias0 alias1 (x ': xs) = x ': Rename alias0 alias1 xs

463

663

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−

469-- | Check if a `TableConstraint` involves a column

664-- | Check if a `TableConstraint` involves a column

470type family ConstraintInvolves column constraint where

665type family ConstraintInvolves column constraint where

471 ConstraintInvolves column ('Check columns) = column `Elem` columns

666 ConstraintInvolves column ('Check columns) = column `Elem` columns

@@ -482,35 +677,22 @@ type family DropIfConstraintsInvolve column constraints where

482 (DropIfConstraintsInvolve column constraints)

677 (DropIfConstraintsInvolve column constraints)

483 (alias ::: constraint ': DropIfConstraintsInvolve column constraints)

678 (alias ::: constraint ': DropIfConstraintsInvolve column constraints)

484

679

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+

485-- | A `SchemumType` is a user-defined type, either a `Table`,

690-- | A `SchemumType` is a user-defined type, either a `Table`,

486-- `View` or `Typedef`.

691-- `View` or `Typedef`.

487data SchemumType

692data SchemumType

488 = Table TableType

693 = Table TableType

489 | View RowType

694 | View RowType

490 | Typedef PGType

695 | 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

514

696

515{- | The schema of a database consists of a list of aliased,

697{- | The schema of a database consists of a list of aliased,

516user-defined `SchemumType`s.

698user-defined `SchemumType`s.

@@ -553,7 +735,9 @@ There are several reasons why one might want to use schemas:

553-}

735-}

554type SchemasType = [(Symbol,SchemaType)]

736type SchemasType = [(Symbol,SchemaType)]

555

737

556−-- | A type family to use for a single schema database.

738+{-|

739+

740+-}

557type family Public (schema :: SchemaType) :: SchemasType

741type family Public (schema :: SchemaType) :: SchemasType

558 where Public schema = '["public" ::: schema]

742 where Public schema = '["public" ::: schema]

559

743

@@ -582,15 +766,23 @@ type PGJsonKey = '[ 'PGint2, 'PGint4, 'PGtext ]

582-- | Is a type a valid JSON type?

766-- | Is a type a valid JSON type?

583type PGJsonType = '[ 'PGjson, 'PGjsonb ]

767type PGJsonType = '[ 'PGjson, 'PGjsonb ]

584

768

585−-- | Utility class for `AllUnique` to provide nicer error messages.

769+-- | An `AlignedList` is a type-aligned list or free category.

586−class IsNotElem x isElem where

770+data AlignedList p x0 x1 where

587−instance IsNotElem x 'False where

771+ Done :: AlignedList p x x

588−instance (TypeError ( 'Text "Cannot assign to "

772+ (:>>) :: p x0 x1 -> AlignedList p x1 x2 -> AlignedList p x0 x2

589− ':<>: 'ShowType alias

773+infixr 7 :>>

590− ':<>: 'Text " more than once"))

774+instance Category (AlignedList p) where

591− => IsNotElem '(alias, a) 'True where

775+ id = Done

592−

776+ (.) list = \case

593−-- | No elem of @xs@ appears more than once, in the context of assignment.

777+ Done -> list

594−class AllUnique (xs :: [(Symbol, a)]) where

778+ step :>> steps -> step :>> (steps >>> list)

595−instance AllUnique '[] where

779+instance (forall t0 t1. RenderSQL (p t0 t1))

596−instance (IsNotElem x (Elem x xs), AllUnique xs) => AllUnique (x ': xs) where

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 @@

1{-|

2Module: Squeal.PostgreSQL.Transaction

3Description: Squeal transaction control language

4−Copyright: (c) Eitan Chatav, 2019

4+Copyright: (c) Eitan Chatav, 2017

5Maintainer: eitan@morphism.tech

6Stability: experimental

@@ -20,12 +20,11 @@ module Squeal.PostgreSQL.Transaction

20 ( -- * Transaction

21 transactionally

22 , transactionally_

23− , transactionallyRetry

24− , ephemerally

25− , ephemerally_

26 , begin

23 , begin

27 , commit

24 , commit

28 , rollback

25 , rollback

26+ , transactionallySchema

27+ , transactionallySchema_

29 -- * Transaction Mode

28 -- * Transaction Mode

30 , TransactionMode (..)

29 , TransactionMode (..)

31 , defaultMode

30 , defaultMode

@@ -35,99 +34,70 @@ module Squeal.PostgreSQL.Transaction

35 , DeferrableMode (..)

34 , DeferrableMode (..)

36 ) where

35 ) where

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

40import Squeal.PostgreSQL.Manipulation

44import Squeal.PostgreSQL.Manipulation

41import Squeal.PostgreSQL.Render

45import Squeal.PostgreSQL.Render

42import Squeal.PostgreSQL.PQ

46import Squeal.PostgreSQL.PQ

47+import Squeal.PostgreSQL.Schema

44−{- | Run a computation `transactionally`;

49+-- | Run a schema invariant 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−-}

50transactionally

51− :: (MonadUnliftIO tx, MonadPQ schemas tx)

51+ :: (MonadBaseControl IO tx, MonadPQ schemas tx)

52 => TransactionMode

53 -> tx x -- ^ run inside a transaction

54 -> tx x

55transactionally mode tx = mask $ \restore -> do

56− manipulate_ $ begin mode

56+ _ <- begin mode

57− result <- restore tx `onException` (manipulate_ rollback)

57+ result <- restore tx `onException` rollback

58− manipulate_ commit

58+ _ <- commit

59 return result

61−-- | Run a computation `transactionally_`, in `defaultMode`.

61+-- | Run a schema invariant computation `transactionally_` in `defaultMode`.

62transactionally_

63− :: (MonadUnliftIO tx, MonadPQ schemas tx)

63+ :: (MonadBaseControl IO tx, MonadPQ schemas tx)

64 => tx x -- ^ run inside a transaction

65 -> tx x

66transactionally_ = transactionally defaultMode

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−

120-- | @BEGIN@ a transaction.

68-- | @BEGIN@ a transaction.

121−begin :: TransactionMode -> Manipulation_ schemas () ()

69+begin :: MonadPQ schemas tx => TransactionMode -> tx (K Result ('[] :: RowType))

122−begin mode = UnsafeManipulation $ "BEGIN" <+> renderSQL mode

70+begin mode = manipulate . UnsafeManipulation $

71+ "BEGIN" <+> renderSQL mode <> ";"

123

124−-- | @COMMIT@ a transaction.

73+-- | @COMMIT@ a schema invariant transaction.

125−commit :: Manipulation_ schemas () ()

74+commit :: MonadPQ schemas tx => tx (K Result ('[] :: RowType))

126−commit = UnsafeManipulation "COMMIT"

75+commit = manipulate $ UnsafeManipulation "COMMIT;"

127

128−-- | @ROLLBACK@ a transaction.

77+-- | @ROLLBACK@ a schema invariant transaction.

129−rollback :: Manipulation_ schemas () ()

78+rollback :: MonadPQ schemas tx => tx (K Result ('[] :: RowType))

130−rollback = UnsafeManipulation "ROLLBACK"

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

131

101

132-- | The available transaction characteristics are the transaction `IsolationLevel`,

102-- | The available transaction characteristics are the transaction `IsolationLevel`,

133-- the transaction `AccessMode` (`ReadWrite` or `ReadOnly`), and the `DeferrableMode`.

103-- the transaction `AccessMode` (`ReadWrite` or `ReadOnly`), and the `DeferrableMode`.

@@ -140,7 +110,7 @@ data TransactionMode = TransactionMode

140-- | `TransactionMode` with a `Serializable` `IsolationLevel`,

110-- | `TransactionMode` with a `Serializable` `IsolationLevel`,

141-- `ReadWrite` `AccessMode` and `NotDeferrable` `DeferrableMode`.

111-- `ReadWrite` `AccessMode` and `NotDeferrable` `DeferrableMode`.

142defaultMode :: TransactionMode

112defaultMode :: TransactionMode

143−defaultMode = TransactionMode ReadCommitted ReadWrite NotDeferrable

113+defaultMode = TransactionMode Serializable ReadWrite NotDeferrable

144

114

145-- | `TransactionMode` with a `Serializable` `IsolationLevel`,

115-- | `TransactionMode` with a `Serializable` `IsolationLevel`,

146-- `ReadOnly` `AccessMode` and `Deferrable` `DeferrableMode`.

116-- `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

2packages:

3- squeal-postgresql

4−

5−extra-deps:

6−- unliftio-pool-0.2.1.0

7−- github: morphismtech/free-categories

8− commit: c0e555fbefb5c21619e532264c4dfeac556d0630