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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:8.6.3

5+ - image: haskell:8.6.5

6 - image: circleci/postgres:latest

7 environment:

8 POSTGRES_USER: root

README.md+64−75

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

46* transactions

47* views

48* array, composite and enumerated types

49−* json operations

49+* json functions and operations

50+* multischema support

51+* correlated subqueries

52+* window functions

53+* text search

51## installation

55## installation

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

72features.

76features.

74```Haskell

78```Haskell

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

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

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

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

77```

81```

79We'll need some imports.

83We'll need some imports.

81```Haskell

85```Haskell

82−>>> import Control.Monad (void)

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

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

84>>> import Data.Int (Int32)

87>>> import Data.Int (Int32)

85>>> import Data.Text (Text)

88>>> import Data.Text (Text)

86>>> import Squeal.PostgreSQL

89>>> import Squeal.PostgreSQL

87−>>> import Squeal.PostgreSQL.Render

88```

90```

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

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

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

101

100```Haskell

102```Haskell

101>>> :{

103>>> :{

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"] ]

102type Schema =

115type Schema =

103− '[ "users" ::: 'Table (

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

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

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

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

107− ])

108− , "emails" ::: 'Table (

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

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

118+type Schemas = Public Schema

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− ]

117:}

119:}

118```

120```

119

121

120Notice the use of type operators.

122Notice the use of type operators.

121

123

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

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

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

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

124operator.

126operator.

125

127

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

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

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

129

131

130Next, we'll write `Definition`s to set up and tear down the schema. In

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

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

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

132has two type parameters, corresponding to the schema

134has two type parameters, corresponding to the schema

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

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

134Here and in the rest of our commands we make use of overloaded

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

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

137```Haskell

139```Haskell

138>>> :{

140>>> :{

139let

141let

140− setup :: Definition '[] Schema

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

141− setup =

143+ setup =

142 createTable #users

144 createTable #users

143 ( serial `as` #id :*

145 ( serial `as` #id :*

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

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

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

169```Haskell

171```Haskell

170>>> :{

172>>> :{

171let

173let

172− teardown :: Definition Schema '[]

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

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

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

174:}

176:}

175

177

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

178DROP TABLE "users";

180DROP TABLE "users";

179```

181```

180

182

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+

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

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

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

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

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

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

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

195+and an output row. When

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

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

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

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

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

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

188need to retrieve the user id that the insert generates and insert it into

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

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

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

190−of our inserts.

201+`with` statement.

191

202

192```Haskell

203```Haskell

193>>> :{

204>>> :{

194let

205let

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

206+ insertUser :: Manipulation_ Schemas User ()

196− insertUser = insertRow #users

207+ insertUser = with (u `as` #u) e

208+ where

209+ u = insertInto #users

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

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

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

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

199−:}

212+ e = insertInto_ #emails $ Select

200−

201−>>> :{

202−let

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

204− insertEmail = insertRow #emails

205− ( Default `as` #id :*

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

206− Set (param @1) `as` #user_id :*

214+ (from (common #u))

207− Set (param @2) `as` #email )

208− OnConflictDoNothing (Returning Nil)

209:}

215:}

210

216

211>>> printSQL insertUser

217>>> printSQL insertUser

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

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"

213−>>> printSQL insertEmail

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

215```

219```

216

220

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

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

218interested in the ids here, just the usernames and email addresses. We

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

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

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

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

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

221

225

222```Haskell

226```Haskell

223>>> :{

227>>> :{

224let

228let

225− getUsers :: Query Schema '[]

229+ getUsers :: Query_ Schemas () User

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

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

228− getUsers = select

230+ getUsers = select_

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

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

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

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

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

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

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

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

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

237```

239```

238

240

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

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

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

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

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

244−

245−```Haskell

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

247−>>> instance SOP.Generic User

248−>>> instance SOP.HasDatatypeInfo User

249−```

250−

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

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

252

242

253```Haskell

243```Haskell

254>>> :{

244>>> :{

255let

245let

256 users :: [User]

246 users :: [User]

257− users =

247+ users =

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

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

259 , User "Bob" Nothing

249 , User "Bob" Nothing

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

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

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

273```Haskell

263```Haskell

274>>> :{

264>>> :{

275let

265let

276− session :: PQ Schema Schema IO ()

266+ session :: PQ Schemas Schemas IO ()

277 session = do

267 session = do

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

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

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

268+ _ <- traversePrepared_ insertUser users

281 usersResult <- runQuery getUsers

269 usersResult <- runQuery getUsers

282 usersRows <- getRows usersResult

270 usersRows <- getRows usersResult

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

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

284in

272in

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

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

286 define setup

274 define setup

287 & pqThen session

275 & pqThen session

288 & pqThen (define teardown)

276 & pqThen (define teardown)

289:}

277:}

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

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

279+-}

291```

280```

RELEASE NOTES.md+400

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

1## RELEASE NOTES

3+### Version 0.5

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.

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+

3### Version 0.4

403### Version 0.4

404

5Version 0.4 strengthens Squeal's type system, adds

405Version 0.4 strengthens Squeal's type system, adds

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

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

12module Main (main, main2) where

14−import Control.Monad (void)

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

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

16import Data.Int (Int16, Int32)

15import Data.Int (Int16, Int32)

17import Data.Monoid ((<>))

16import Data.Monoid ((<>))

18import Data.Text (Text)

17import Data.Text (Text)

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

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

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

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

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

41 ])

40 ])

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

42 ]

44type Schemas = Public Schema

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

53 >>>

54 createTable #emails

55 ( serial `as` #id :*

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

56+ hask @Int32 `as` #user_id :*

57− (text & nullable) `as` #email )

57+ hask @(Maybe Text) `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))

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

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

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

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

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

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

66insertUser = insertInto #users

68insertUser = insertInto #users

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

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

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

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

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

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

71insertEmail = insertInto_ #emails

73insertEmail = insertInto_ #emails

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

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

74getUsers :: Query_ Schemas () User

76getUsers :: Query_ Schemas () User

75getUsers = select_

77getUsers = select_

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

84instance SOP.HasDatatypeInfo User

86instance SOP.HasDatatypeInfo User

86users :: [User]

88users :: [User]

87−users =

89+users =

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

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

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

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

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

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

91 ]

93 ]

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

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

94session = do

96session = do

95− liftBase $ Char8.putStrLn "manipulating"

97+ liftIO $ Char8.putStrLn "manipulating"

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

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

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

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

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

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

99− liftBase $ Char8.putStrLn "querying"

101+ liftIO $ Char8.putStrLn "querying"

100 usersResult <- runQuery getUsers

102 usersResult <- runQuery getUsers

101 usersRows <- getRows usersResult

103 usersRows <- getRows usersResult

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

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

103

105

104main :: IO ()

106main :: IO ()

105main = do

107main = do

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

117

119

118main2 :: IO ()

120main2 :: IO ()

119main2 =

121main2 =

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

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

121 define setup

123 define setup

122 & pqThen session

124 & pqThen session

123 & pqThen (define teardown)

125 & pqThen (define teardown)

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

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

1name: squeal-postgresql

2−version: 0.4.9.0

2+version: 0.5.1.0

3synopsis: Squeal PostgreSQL Library

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

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

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

22 hs-source-dirs: src

23 exposed-modules:

24 Squeal.PostgreSQL

25+ Squeal.PostgreSQL.Alias

25 Squeal.PostgreSQL.Binary

26 Squeal.PostgreSQL.Binary

26 Squeal.PostgreSQL.Definition

27 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

27 Squeal.PostgreSQL.Expression

35 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

28 Squeal.PostgreSQL.Manipulation

55 Squeal.PostgreSQL.Manipulation

29 Squeal.PostgreSQL.Migration

56 Squeal.PostgreSQL.Migration

30 Squeal.PostgreSQL.Pool

57 Squeal.PostgreSQL.Pool

58+ Squeal.PostgreSQL.PG

31 Squeal.PostgreSQL.PQ

59 Squeal.PostgreSQL.PQ

32 Squeal.PostgreSQL.Render

60 Squeal.PostgreSQL.Render

33 Squeal.PostgreSQL.Query

61 Squeal.PostgreSQL.Query

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

42 , bytestring >= 0.10.8.2

70 , bytestring >= 0.10.8.2

43 , bytestring-strict-builder >= 0.4.5

71 , bytestring-strict-builder >= 0.4.5

44 , deepseq >= 1.4.3.0

72 , deepseq >= 1.4.3.0

73+ , free-categories >= 0.1.0.0

45− , generics-sop >= 0.3.2.0

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

46− , lifted-base >= 0.2.3.12

47 , mmorph >= 1.1.1

75 , mmorph >= 1.1.1

48− , monad-control >= 1.0.2.3

49 , mtl >= 2.2.2

76 , mtl >= 2.2.2

50 , network-ip >= 0.3.0.2

77 , network-ip >= 0.3.0.2

51 , postgresql-binary >= 0.12.1

78 , postgresql-binary >= 0.12.1

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

56 , text >= 1.2.3.0

83 , text >= 1.2.3.0

57 , time >= 1.8.0.2

84 , time >= 1.8.0.2

58 , transformers >= 0.5.2.0

85 , transformers >= 0.5.2.0

59− , transformers-base >= 0.4.4

86+ , unliftio >= 0.2.10

87+ , unliftio-pool >= 0.2.1.0

60 , uuid-types >= 1.0.3

88 , uuid-types >= 1.0.3

61 , vector >= 0.12.0.1

89 , vector >= 0.12.0.1

63−test-suite squeal-postgresql-doctest

91+test-suite doctest

64 default-language: Haskell2010

92 default-language: Haskell2010

65 type: exitcode-stdio-1.0

93 type: exitcode-stdio-1.0

66 hs-source-dirs: test

94 hs-source-dirs: test

67 ghc-options: -Wall

95 ghc-options: -Wall

68− main-is: DocTest.hs

96+ main-is: Doc.hs

69 build-depends:

97 build-depends:

70 base >= 4.10.0.0

98 base >= 4.10.0.0

71 , doctest >= 0.11.4

99 , doctest >= 0.11.4

100+ , squeal-postgresql

101

73−test-suite squeal-postgresql-specs

102+test-suite properties

74 default-language: Haskell2010

103 default-language: Haskell2010

75 type: exitcode-stdio-1.0

104 type: exitcode-stdio-1.0

76− hs-source-dirs: test/Specs

105+ hs-source-dirs: test

77− ghc-options: -Wall -main-is Specs

106+ ghc-options: -Wall

78− main-is: Specs.hs

107+ main-is: Property.hs

79− other-modules: ExceptionHandling

80 build-depends:

108 build-depends:

81 base >= 4.10.0.0

109 base >= 4.10.0.0

82 , bytestring >= 0.10.8.2

110 , 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

83 , generics-sop >= 0.3.1.0

127 , generics-sop >= 0.3.1.0

84 , hspec >= 2.4.8

128 , hspec >= 2.4.8

129+ , mtl >= 2.2.2

85 , squeal-postgresql

130 , squeal-postgresql

86 , text >= 1.2.2.2

131 , text >= 1.2.2.2

87− , transformers >= 0.5.2.0

88− , transformers-base >= 0.4.4

89 , vector >= 0.12.0.1

132 , vector >= 0.12.0.1

133

91−executable squeal-postgresql-example

134+executable example

92 default-language: Haskell2010

135 default-language: Haskell2010

93 hs-source-dirs: exe

136 hs-source-dirs: exe

94 ghc-options: -Wall

137 ghc-options: -Wall

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

101 , squeal-postgresql

144 , squeal-postgresql

102 , text >= 1.2.2.2

145 , text >= 1.2.2.2

103 , transformers >= 0.5.2.0

146 , transformers >= 0.5.2.0

104− , transformers-base >= 0.4.4

105 , vector >= 0.12.0.1

147 , vector >= 0.12.0.1

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

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

1{-|

2Module: Squeal.PostgreSQL

3−Description: Squeel export module

3+Description: Squeal export module

4−Copyright: (c) Eitan Chatav, 2017

4+Copyright: (c) Eitan Chatav, 2019

5Maintainer: eitan@morphism.tech

6Stability: experimental

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

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

12features.

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

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

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

17We'll need some imports.

19−>>> import Control.Monad (void)

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

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

21>>> import Data.Int (Int32)

20>>> import Data.Int (Int32)

22>>> import Data.Text (Text)

21>>> import Data.Text (Text)

23>>> import Squeal.PostgreSQL

22>>> import Squeal.PostgreSQL

24−>>> import Squeal.PostgreSQL.Render

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

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

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

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

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

62Next, we'll write `Definition`s to set up and tear down the schema. In

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

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

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

64has two type parameters, corresponding to the schema

62has two type parameters, corresponding to the schema

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

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

66Here and in the rest of our commands we make use of overloaded

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

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

69>>> :{

67>>> :{

70let

68let

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

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

72− setup =

70+ setup =

73 createTable #users

71 createTable #users

74 ( serial `as` #id :*

72 ( serial `as` #id :*

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

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

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

104DROP TABLE "emails";

102DROP TABLE "emails";

105DROP TABLE "users";

103DROP TABLE "users";

106

104

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+

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

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

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

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

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

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

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

115+and an output row. When

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

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

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

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

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

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

114need to retrieve the user id that the insert generates and insert it into

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

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

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

116−of our inserts.

121+`with` statement.

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

126

122

127>>> :{

123>>> :{

128let

124let

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

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

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

131 where

127 where

132 u = insertInto #users

128 u = insertInto #users

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

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

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

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

135− e = insertInto_ #emails

131+ e = insertInto_ #emails $ Select

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

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

133+ (from (common #u))

137:}

134:}

138

135

139>>> printSQL insertUser

136>>> printSQL insertUser

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"

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"

141

138

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

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

143interested in the ids here, just the usernames and email addresses. We

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

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

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

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

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

146

143

147>>> :{

144>>> :{

148let

145let

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

162>>> :{

159>>> :{

163let

160let

164 users :: [User]

161 users :: [User]

165− users =

162+ users =

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

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

167 , User "Bob" Nothing

164 , User "Bob" Nothing

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

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

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

184 _ <- traversePrepared_ insertUser users

181 _ <- traversePrepared_ insertUser users

185 usersResult <- runQuery getUsers

182 usersResult <- runQuery getUsers

186 usersRows <- getRows usersResult

183 usersRows <- getRows usersResult

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

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

188in

185in

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

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

190 define setup

187 define setup

191 & pqThen session

188 & pqThen session

192 & pqThen (define teardown)

189 & pqThen (define teardown)

193:}

190:}

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

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

195-}

192-}

196−module Squeal.PostgreSQL

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

197− ( module Squeal.PostgreSQL.Binary

194+

198− , module Squeal.PostgreSQL.Definition

199− , module Squeal.PostgreSQL.Expression

200− , module Squeal.PostgreSQL.Manipulation

201− , module Squeal.PostgreSQL.PQ

202− , module Squeal.PostgreSQL.Query

203− , module Squeal.PostgreSQL.Schema

204− , module Squeal.PostgreSQL.Transaction

205− ) where

206−

207−import Squeal.PostgreSQL.Binary

195+import Squeal.PostgreSQL.Alias as X

196+import Squeal.PostgreSQL.Binary as X

208−import Squeal.PostgreSQL.Definition

197+import Squeal.PostgreSQL.Definition as X

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

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

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

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

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

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

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

209−import Squeal.PostgreSQL.Expression

205+import Squeal.PostgreSQL.Expression as X

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

224+import Squeal.PostgreSQL.List as X

210−import Squeal.PostgreSQL.Manipulation

225+import Squeal.PostgreSQL.Manipulation as X

226+import Squeal.PostgreSQL.Migration as X

227+import Squeal.PostgreSQL.PG as X

228+import Squeal.PostgreSQL.Pool as X

211−import Squeal.PostgreSQL.PQ

229+import Squeal.PostgreSQL.PQ as X

212−import Squeal.PostgreSQL.Query

230+import Squeal.PostgreSQL.Query as X

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

213−import Squeal.PostgreSQL.Schema

232+import Squeal.PostgreSQL.Schema as X

214−import Squeal.PostgreSQL.Transaction

233+import Squeal.PostgreSQL.Transaction as X

squeal-postgresql/src/Squeal/PostgreSQL/Alias.hsnew file+249

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

1+{-|

2+Module: Squeal.PostgreSQL.Alias

3+Description: Aliases

4+Copyright: (c) Eitan Chatav, 2019

5+Maintainer: eitan@morphism.tech

6+Stability: experimental

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+221−332

@@ -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.Base (liftBase)

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

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

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

43 result <- runQueryParams roundTrip input

44 Just output <- firstRow result

45− liftBase . print $ input == output

45+ liftIO . 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−void . withConnection "host=localhost port=5432 dbname=exampledb" $ do

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

82 result <- runQueryParams roundTrip input

83 Just output <- firstRow result

84− liftBase . print $ input == output

84+ liftIO . print $ input == output

85:}

86True

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

168 session = do

169 result <- runQueryParams roundTrip input

170 Just output <- firstRow result

171− liftBase . print $ input == output

171+ liftIO . print $ input == output

172in

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

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

174 define setup

175 & pqThen session

176 & pqThen (define teardown)

@@ -202,45 +202,37 @@ 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 (..)

219− -- * Encoding

205+ ( -- * Encoding

220− , ToParam (..)

206+ ToParam (..)

221 , ToParams (..)

207 , ToParams (..)

208+ , ToNullityParam (..)

209+ , ToField (..)

210+ , ToFixArray (..)

222 -- * Decoding

211 -- * Decoding

223 , FromValue (..)

212 , FromValue (..)

224 , FromRow (..)

213 , FromRow (..)

214+ , FromField (..)

215+ , FromFixArray (..)

225 -- * Only

216 -- * Only

226 , Only (..)

217 , Only (..)

227− , P (..)

218+ -- * Oid

219+ , OidOf (..)

220+ , OidOfParam (..)

221+ , OidOfField (..)

228 ) where

222 ) where

229

223

230import BinaryParser

224import BinaryParser

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

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

232import Control.Arrow (left)

226import Control.Arrow (left)

233import Control.Monad

227import Control.Monad

234−import Data.Aeson (Value)

235−import Data.ByteString (ByteString)

236import Data.Int

228import Data.Int

237import Data.Kind

229import Data.Kind

238import Data.Scientific

230import Data.Scientific

239−import Data.Text (Text)

240import Data.Time

231import Data.Time

241import Data.UUID.Types

232import Data.UUID.Types

242import Data.Vector (Vector)

233import Data.Vector (Vector)

243import Data.Word

234import Data.Word

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

244import Generics.SOP

236import Generics.SOP

245import Generics.SOP.Record

237import Generics.SOP.Record

246import GHC.TypeLits

238import GHC.TypeLits

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

254import qualified Data.Text as Strict (Text)

246import qualified Data.Text as Strict (Text)

255import qualified Data.Text as Strict.Text

247import qualified Data.Text as Strict.Text

256import qualified Data.Vector as Vector

248import qualified Data.Vector as Vector

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

249+import qualified Database.PostgreSQL.LibPQ as LibPQ

258import qualified GHC.Generics as GHC

250import qualified GHC.Generics as GHC

259import qualified PostgreSQL.Binary.Decoding as Decoding

251import qualified PostgreSQL.Binary.Decoding as Decoding

260import qualified PostgreSQL.Binary.Encoding as Encoding

252import qualified PostgreSQL.Binary.Encoding as Encoding

261

253

254+import Squeal.PostgreSQL.Alias

255+import Squeal.PostgreSQL.List

256+import Squeal.PostgreSQL.PG

262import Squeal.PostgreSQL.Schema

257import Squeal.PostgreSQL.Schema

263

258

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

320 toParam = K . Encoding.jsonb_bytes

313 toParam = K . Encoding.jsonb_bytes

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

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

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

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

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

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

324 toParam = K

317 toParam = K

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

318+ . Encoding.array_foldable

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

326 . getVarArray

320 . getVarArray

327−instance (ToParam x pg, HasOid pg)

321+instance (ToParam x pg, OidOf pg)

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

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

329 toParam = K

323 toParam = K

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

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

331 . getVarArray

325 . getVarArray

332−instance (ToParam x pg, HasOid pg)

326+instance (ToParam x pg, OidOf pg)

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

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

334 toParam = K

328 toParam = K

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

329+ . Encoding.nullableArray_vector

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

336 . getVarArray

331 . getVarArray

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

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

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

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

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

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

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

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

341instance

336instance

342 ( IsEnumType x

337 ( IsEnumType x

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

361 ( SListI fields

356 ( SListI fields

362 , IsRecord x xs

357 , IsRecord x xs

363 , AllZip ToField xs fields

358 , AllZip ToField xs fields

364− , All HasAliasedOid fields

359+ , All OidOfField fields

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

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

366 toParam =

361 toParam =

367 let

362 let

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

369 encoders = htrans (Proxy @ToField) toField

364 encoders = htrans (Proxy @ToField) toField

370

365

371 composite

366 composite

372− :: All HasAliasedOid row

367+ :: All OidOfField row

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

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

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

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

375 composite fields = K $

370 composite fields = K $

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

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

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

387 let

382 let

388 each

383 each

389− :: HasAliasedOid field

384+ :: OidOfField field

390 => K (Maybe Encoding.Encoding) field

385 => K (Maybe Encoding.Encoding) field

391 -> Encoding.Encoding

386 -> Encoding.Encoding

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

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

393− word32BE (aliasedOid @field)

388+ word32BE (getOid (oidOfField @field))

394 <> case field of

389 <> case field of

395 Nothing -> int64BE (-1)

390 Nothing -> int64BE (-1)

396 Just value ->

391 Just value ->

397 int32BE (fromIntegral (builderLength value))

392 int32BE (fromIntegral (builderLength value))

398 <> value

393 <> value

399 in

394 in

400− hcfoldMap (Proxy @HasAliasedOid) each fields

395+ hcfoldMap (Proxy @OidOfField) each fields

401

396

402 in

397 in

403 composite . encoders . toRecord . getComposite

398 composite . encoders . toRecord . getComposite

404

399

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.

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

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

406− aliasedOid :: Word32

514+ oidOfField :: Oid

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

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

408− aliasedOid = oid @ty

516+ oidOfField = oidOf @ty

409−

517+

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

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

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

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

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

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

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

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

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

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

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

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

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

416

526

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.

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

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

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

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

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

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

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

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

421

535

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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

603 Decoding.valueParser (fromValue @pg) bytestring

722 Decoding.valueParser (fromValue @pg) bytestring

604

723

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.

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

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

606 fromFixArray :: Decoding.Array y

729 fromFixArray :: Decoding.Array y

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

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

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

646 = fmap fromRecord

769 = fmap fromRecord

647 . hsequence'

770 . hsequence'

648 . htrans (Proxy @FromField) fromField

771 . htrans (Proxy @FromField) fromField

772+------------------------------------------------------

773+-- P records

774+------------------------------------------------------

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

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

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

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

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

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

652−instance

778+-- instance

653− ( row ~ Join row1 row2

779+-- ( row ~ Join row1 row2

654− , FromRow row1 hask1

780+-- , FromRow row1 hask1

655− , FromRow row2 hask2

781+-- , FromRow row2 hask2

656− , SListI row

782+-- , SListI row

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

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

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

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

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

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

660−instance

786+-- instance

661− ( row ~ Join row1 row23

787+-- ( row ~ Join row1 row23

662− , FromRow row1 hask1

788+-- , FromRow row1 hask1

663− , FromRow row23 (hask2, hask3)

789+-- , FromRow row23 (hask2, hask3)

664− , SListI row

790+-- , SListI row

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

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

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

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

667− (row1, row23) -> do

793+-- (row1, row23) -> do

668− hask1 <- fromRow row1

794+-- hask1 <- fromRow row1

669− (hask2, hask3) <- fromRow row23

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

670− return (hask1, hask2, hask3)

796+-- return (hask1, hask2, hask3)

671−instance

797+-- instance

672− ( row ~ Join row1 row234

798+-- ( row ~ Join row1 row234

673− , FromRow row1 hask1

799+-- , FromRow row1 hask1

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

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

675− , SListI row

801+-- , SListI row

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

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

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

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

678− (row1, row234) -> do

804+-- (row1, row234) -> do

679− hask1 <- fromRow row1

805+-- hask1 <- fromRow row1

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

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

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

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

682−instance

808+-- instance

683− ( row ~ Join row1 row2345

809+-- ( row ~ Join row1 row2345

684− , FromRow row1 hask1

810+-- , FromRow row1 hask1

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

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

686− , SListI row

812+-- , SListI row

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

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

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

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

689− (row1, row2345) -> do

815+-- (row1, row2345) -> do

690− hask1 <- fromRow row1

816+-- hask1 <- fromRow row1

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

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

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

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

693

819

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

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

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

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

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

718replicateMN mx = hsequence' $

844replicateMN mx = hsequence' $

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

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

720

846

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

847+getOid :: LibPQ.Oid -> Word32

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

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

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+15−982

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

11{-# LANGUAGE

12 AllowAmbiguousTypes

13 , ConstraintKinds

14+ , DeriveAnyClass

14 , DeriveGeneric

15 , DeriveGeneric

16+ , DerivingStrategies

15 , FlexibleContexts

17 , FlexibleContexts

16 , FlexibleInstances

18 , FlexibleInstances

17 , GADTs

19 , GADTs

18− , GeneralizedNewtypeDeriving

19 , LambdaCase

20 , LambdaCase

20 , MultiParamTypeClasses

21 , MultiParamTypeClasses

22+ , OverloadedLabels

21 , OverloadedStrings

23 , OverloadedStrings

22 , RankNTypes

24 , RankNTypes

23 , ScopedTypeVariables

25 , ScopedTypeVariables

@@ -25,81 +27,31 @@ Squeal data definition language.

25 , TypeInType

27 , TypeInType

26 , TypeOperators

28 , TypeOperators

27 , UndecidableSuperClasses

29 , UndecidableSuperClasses

30+ , UndecidableInstances

28#-}

31#-}

30module Squeal.PostgreSQL.Definition

33module Squeal.PostgreSQL.Definition

31 ( -- * Definition

34 ( -- * Definition

32 Definition (..)

35 Definition (..)

33 , (>>>)

36 , (>>>)

34− -- * Tables

37+ , manipDefinition

35− -- ** Create

36− , createSchema

37− , createSchemaIfNotExists

38− , createTable

39− , createTableIfNotExists

40− , createView

41− , createTypeEnum

42− , createTypeEnumFrom

43− , createTypeComposite

44− , createTypeCompositeFrom

45− , TableConstraintExpression (..)

46− , check

47− , unique

48− , primaryKey

49− , foreignKey

50− , ForeignKeyed

51− , OnDeleteClause (..)

52− , OnUpdateClause (..)

53− -- ** Drop

54− , dropSchema

55− , dropTable

56− , dropView

57− , dropType

58− -- ** Alter

59− , alterTable

60− , alterTableRename

61− , AlterTable (..)

62− , addConstraint

63− , dropConstraint

64− , AddColumn (..)

65− , dropColumn

66− , renameColumn

67− , alterColumn

68− , AlterColumn (..)

69− , setDefault

70− , dropDefault

71− , setNotNull

72− , dropNotNull

73− , alterType

74− -- * Columns

75− , ColumnTypeExpression (..)

76− , nullable

77− , notNullable

78− , default_

79− , serial2

80− , smallserial

81− , serial4

82− , serial

83− , serial8

84− , bigserial

85 ) where

38 ) where

87import Control.Category

40import Control.Category

88import Control.DeepSeq

41import Control.DeepSeq

89import Data.ByteString

42import Data.ByteString

90import Data.Monoid

43import Data.Monoid

91−import GHC.TypeLits

92import Prelude hiding ((.), id)

44import Prelude hiding ((.), id)

94−import qualified Generics.SOP as SOP

95import qualified GHC.Generics as GHC

46import qualified GHC.Generics as GHC

97−import Squeal.PostgreSQL.Binary

48+import Squeal.PostgreSQL.Manipulation

98−import Squeal.PostgreSQL.Expression

99−import Squeal.PostgreSQL.Query

100import Squeal.PostgreSQL.Render

49import Squeal.PostgreSQL.Render

101import Squeal.PostgreSQL.Schema

50import Squeal.PostgreSQL.Schema

102

52+-- $setup

53+-- >>> import Squeal.PostgreSQL

54+

103{-----------------------------------------

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

104statements

56statements

105-----------------------------------------}

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

@@ -121,929 +73,10 @@ instance Category Definition where

121 ddl1 . ddl0 = UnsafeDefinition $

73 ddl1 . ddl0 = UnsafeDefinition $

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

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

123

124−{-----------------------------------------

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

125−CREATE statements

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

126−-----------------------------------------}

78+manipDefinition

127−

79+ :: Manipulation '[] schemas '[] '[]

128−createSchema

80+ -- ^ no input or output

129− :: KnownSymbol sch

130− => Alias sch

131− -> Definition schemas (Create sch '[] schemas)

132−createSchema sch = UnsafeDefinition $

133− "CREATE" <+> "SCHEMA" <+> renderSQL sch <> ";"

134−

135−createSchemaIfNotExists

136− :: (KnownSymbol sch, Has sch schemas schema)

137− => Alias sch

138− -> Definition schemas schemas

139−createSchemaIfNotExists sch = UnsafeDefinition $

140− "CREATE" <+> "SCHEMA" <+> "IF" <+> "NOT" <+> "EXISTS"

141− <+> renderSQL sch <> ";"

142−

143−{- | `createTable` adds a table to the schema.

144−

145−>>> :set -XOverloadedLabels

146−>>> :{

147−type Table = '[] :=>

148− '[ "a" ::: 'NoDef :=> 'Null 'PGint4

149− , "b" ::: 'NoDef :=> 'Null 'PGfloat4 ]

150−:}

151−

152−>>> :{

153−let

154− setup :: Definition (Public '[]) (Public '["tab" ::: 'Table Table])

155− setup = createTable #tab

156− (nullable int `as` #a :* nullable real `as` #b) Nil

157−in printSQL setup

158−:}

159−CREATE TABLE "tab" ("a" int NULL, "b" real NULL);

160−-}

161−createTable

162− :: ( KnownSymbol sch

163− , KnownSymbol tab

164− , columns ~ (col ': cols)

165− , SOP.SListI columns

166− , SOP.SListI constraints

167− , Has sch schemas0 schema0

168− , schemas1 ~ Alter sch (Create tab ('Table (constraints :=> columns)) schema0) schemas0 )

169− => QualifiedAlias sch tab -- ^ the name of the table to add

170− -> NP (Aliased (ColumnTypeExpression schemas0)) columns

171− -- ^ the names and datatype of each column

172− -> NP (Aliased (TableConstraintExpression sch tab schemas1)) constraints

173− -- ^ constraints that must hold for the table

174− -> Definition schemas0 schemas1

175−createTable tab columns constraints = UnsafeDefinition $

176− "CREATE TABLE" <+> renderCreation tab columns constraints

177−

178−{-| `createTableIfNotExists` creates a table if it doesn't exist, but does not add it to the schema.

179−Instead, the schema already has the table so if the table did not yet exist, the schema was wrong.

180−`createTableIfNotExists` fixes this. Interestingly, this property makes it an idempotent in

181−the `Category` of `Definition`s.

182−

183−>>> :set -XOverloadedLabels -XTypeApplications

184−>>> :{

185−type Table = '[] :=>

186− '[ "a" ::: 'NoDef :=> 'Null 'PGint4

187− , "b" ::: 'NoDef :=> 'Null 'PGfloat4 ]

188−:}

189−

190−>>> type Schemas = Public '["tab" ::: 'Table Table]

191−

192−>>> :{

193−let

194− setup :: Definition Schemas Schemas

195− setup = createTableIfNotExists #tab

196− (nullable int `as` #a :* nullable real `as` #b) Nil

197−in printSQL setup

198−:}

199−CREATE TABLE IF NOT EXISTS "tab" ("a" int NULL, "b" real NULL);

200−-}

201−createTableIfNotExists

202− :: ( Has sch schemas schema

203− , Has tab schema ('Table (constraints :=> columns))

204− , SOP.SListI columns

205− , SOP.SListI constraints )

206− => QualifiedAlias sch tab -- ^ the name of the table to add

207− -> NP (Aliased (ColumnTypeExpression schemas)) columns

208− -- ^ the names and datatype of each column

209− -> NP (Aliased (TableConstraintExpression sch tab schemas)) constraints

210− -- ^ constraints that must hold for the table

211 -> Definition schemas schemas

81 -> Definition schemas schemas

212−createTableIfNotExists tab columns constraints = UnsafeDefinition $

82+manipDefinition = UnsafeDefinition . (<> ";") . renderSQL

213− "CREATE TABLE IF NOT EXISTS"

214− <+> renderCreation tab columns constraints

215−

216−-- helper function for `createTable` and `createTableIfNotExists`

217−renderCreation

218− :: ( KnownSymbol sch

219− , KnownSymbol tab

220− , SOP.SListI columns

221− , SOP.SListI constraints )

222− => QualifiedAlias sch tab -- ^ the name of the table to add

223− -> NP (Aliased (ColumnTypeExpression schemas0)) columns

224− -- ^ the names and datatype of each column

225− -> NP (Aliased (TableConstraintExpression sch tab schemas1)) constraints

226− -- ^ constraints that must hold for the table

227− -> ByteString

228−renderCreation tab columns constraints = renderSQL tab

229− <+> parenthesized

230− ( renderCommaSeparated renderColumnDef columns

231− <> ( case constraints of

232− Nil -> ""

233− _ -> ", " <>

234− renderCommaSeparated renderConstraint constraints ) )

235− <> ";"

236− where

237− renderColumnDef :: Aliased (ColumnTypeExpression schemas) x -> ByteString

238− renderColumnDef (ty `As` column) =

239− renderSQL column <+> renderColumnTypeExpression ty

240− renderConstraint

241− :: Aliased (TableConstraintExpression sch tab schemas) constraint

242− -> ByteString

243− renderConstraint (constraint `As` alias) =

244− "CONSTRAINT" <+> renderSQL alias <+> renderSQL constraint

245−

246−-- | Data types are a way to limit the kind of data that can be stored in a

247−-- table. For many applications, however, the constraint they provide is

248−-- too coarse. For example, a column containing a product price should

249−-- probably only accept positive values. But there is no standard data type

250−-- that accepts only positive numbers. Another issue is that you might want

251−-- to constrain column data with respect to other columns or rows.

252−-- For example, in a table containing product information,

253−-- there should be only one row for each product number.

254−-- `TableConstraint`s give you as much control over the data in your tables

255−-- as you wish. If a user attempts to store data in a column that would

256−-- violate a constraint, an error is raised. This applies

257−-- even if the value came from the default value definition.

258−newtype TableConstraintExpression

259− (sch :: Symbol)

260− (tab :: Symbol)

261− (schemas :: SchemasType)

262− (constraint :: TableConstraint)

263− = UnsafeTableConstraintExpression

264− { renderTableConstraintExpression :: ByteString }

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

266−instance RenderSQL

267− (TableConstraintExpression sch tab schemas constraint) where

268− renderSQL = renderTableConstraintExpression

269−

270−{-| A `check` constraint is the most generic `TableConstraint` type.

271−It allows you to specify that the value in a certain column must satisfy

272−a Boolean (truth-value) expression.

273−

274−>>> :{

275−type Schema = '[

276− "tab" ::: 'Table ('[ "inequality" ::: 'Check '["a","b"]] :=> '[

277− "a" ::: 'NoDef :=> 'NotNull 'PGint4,

278− "b" ::: 'NoDef :=> 'NotNull 'PGint4

279− ])]

280−:}

281−

282−>>> :{

283−let

284− definition :: Definition (Public '[]) (Public Schema)

285− definition = createTable #tab

286− ( (int & notNullable) `as` #a :*

287− (int & notNullable) `as` #b )

288− ( check (#a :* #b) (#a .> #b) `as` #inequality )

289−:}

290−

291−>>> printSQL definition

292−CREATE TABLE "tab" ("a" int NOT NULL, "b" int NOT NULL, CONSTRAINT "inequality" CHECK (("a" > "b")));

293−-}

294−check

295− :: ( Has sch schemas schema

296− , Has tab schema ('Table table)

297− , HasAll aliases (TableToRow table) subcolumns )

298− => NP Alias aliases

299− -- ^ specify the subcolumns which are getting checked

300− -> (forall t. Condition '[] 'Ungrouped '[] schemas '[] '[t ::: subcolumns])

301− -- ^ a closed `Condition` on those subcolumns

302− -> TableConstraintExpression sch tab schemas ('Check aliases)

303−check _cols condition = UnsafeTableConstraintExpression $

304− "CHECK" <+> parenthesized (renderSQL condition)

305−

306−{-| A `unique` constraint ensure that the data contained in a column,

307−or a group of columns, is unique among all the rows in the table.

308−

309−>>> :{

310−type Schema = '[

311− "tab" ::: 'Table( '[ "uq_a_b" ::: 'Unique '["a","b"]] :=> '[

312− "a" ::: 'NoDef :=> 'Null 'PGint4,

313− "b" ::: 'NoDef :=> 'Null 'PGint4

314− ])]

315−:}

316−

317−>>> :{

318−let

319− definition :: Definition (Public '[]) (Public Schema)

320− definition = createTable #tab

321− ( (int & nullable) `as` #a :*

322− (int & nullable) `as` #b )

323− ( unique (#a :* #b) `as` #uq_a_b )

324−:}

325−

326−>>> printSQL definition

327−CREATE TABLE "tab" ("a" int NULL, "b" int NULL, CONSTRAINT "uq_a_b" UNIQUE ("a", "b"));

328−-}

329−unique

330− :: ( Has sch schemas schema

331− , Has tab schema('Table table)

332− , HasAll aliases (TableToRow table) subcolumns )

333− => NP Alias aliases

334− -- ^ specify subcolumns which together are unique for each row

335− -> TableConstraintExpression sch tab schemas ('Unique aliases)

336−unique columns = UnsafeTableConstraintExpression $

337− "UNIQUE" <+> parenthesized (renderSQL columns)

338−

339−{-| A `primaryKey` constraint indicates that a column, or group of columns,

340−can be used as a unique identifier for rows in the table.

341−This requires that the values be both unique and not null.

342−

343−>>> :{

344−type Schema = '[

345− "tab" ::: 'Table ('[ "pk_id" ::: 'PrimaryKey '["id"]] :=> '[

346− "id" ::: 'Def :=> 'NotNull 'PGint4,

347− "name" ::: 'NoDef :=> 'NotNull 'PGtext

348− ])]

349−:}

350−

351−>>> :{

352−let

353− definition :: Definition (Public '[]) (Public Schema)

354− definition = createTable #tab

355− ( serial `as` #id :*

356− (text & notNullable) `as` #name )

357− ( primaryKey #id `as` #pk_id )

358−:}

359−

360−>>> printSQL definition

361−CREATE TABLE "tab" ("id" serial, "name" text NOT NULL, CONSTRAINT "pk_id" PRIMARY KEY ("id"));

362−-}

363−primaryKey

364− :: ( Has sch schemas schema

365− , Has tab schema ('Table table)

366− , HasAll aliases (TableToColumns table) subcolumns

367− , AllNotNull subcolumns )

368− => NP Alias aliases

369− -- ^ specify the subcolumns which together form a primary key.

370− -> TableConstraintExpression sch tab schemas ('PrimaryKey aliases)

371−primaryKey columns = UnsafeTableConstraintExpression $

372− "PRIMARY KEY" <+> parenthesized (renderSQL columns)

373−

374−{-| A `foreignKey` specifies that the values in a column

375−(or a group of columns) must match the values appearing in some row of

376−another table. We say this maintains the referential integrity

377−between two related tables.

378−

379−>>> :{

380−type Schema =

381− '[ "users" ::: 'Table (

382− '[ "pk_users" ::: 'PrimaryKey '["id"] ] :=>

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

384− , "name" ::: 'NoDef :=> 'NotNull 'PGtext

385− ])

386− , "emails" ::: 'Table (

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

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

389− ] :=>

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

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

392− , "email" ::: 'NoDef :=> 'Null 'PGtext

393− ])

394− ]

395−:}

396−

397−>>> :{

398−let

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

400− setup =

401− createTable #users

402− ( serial `as` #id :*

403− (text & notNullable) `as` #name )

404− ( primaryKey #id `as` #pk_users ) >>>

405− createTable #emails

406− ( serial `as` #id :*

407− (int & notNullable) `as` #user_id :*

408− (text & nullable) `as` #email )

409− ( primaryKey #id `as` #pk_emails :*

410− foreignKey #user_id #users #id

411− OnDeleteCascade OnUpdateCascade `as` #fk_user_id )

412−in printSQL setup

413−:}

414−CREATE TABLE "users" ("id" serial, "name" text NOT NULL, CONSTRAINT "pk_users" PRIMARY KEY ("id"));

415−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);

416−

417−A `foreignKey` can even be a table self-reference.

418−

419−>>> :{

420−type Schema =

421− '[ "employees" ::: 'Table (

422− '[ "employees_pk" ::: 'PrimaryKey '["id"]

423− , "employees_employer_fk" ::: 'ForeignKey '["employer_id"] "employees" '["id"]

424− ] :=>

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

426− , "name" ::: 'NoDef :=> 'NotNull 'PGtext

427− , "employer_id" ::: 'NoDef :=> 'Null 'PGint4

428− ])

429− ]

430−:}

431−

432−>>> :{

433−let

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

435− setup =

436− createTable #employees

437− ( serial `as` #id :*

438− (text & notNullable) `as` #name :*

439− (integer & nullable) `as` #employer_id )

440− ( primaryKey #id `as` #employees_pk :*

441− foreignKey #employer_id #employees #id

442− OnDeleteCascade OnUpdateCascade `as` #employees_employer_fk )

443−in printSQL setup

444−:}

445−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);

446−-}

447−foreignKey

448− :: (ForeignKeyed schemas sch schema child parent

449− table reftable

450− columns refcolumns

451− constraints cols

452− reftys tys )

453− => NP Alias columns

454− -- ^ column or columns in the table

455− -> Alias parent

456− -- ^ reference table

457− -> NP Alias refcolumns

458− -- ^ reference column or columns in the reference table

459− -> OnDeleteClause

460− -- ^ what to do when reference is deleted

461− -> OnUpdateClause

462− -- ^ what to do when reference is updated

463− -> TableConstraintExpression sch child schemas

464− ('ForeignKey columns parent refcolumns)

465−foreignKey keys parent refs ondel onupd = UnsafeTableConstraintExpression $

466− "FOREIGN KEY" <+> parenthesized (renderSQL keys)

467− <+> "REFERENCES" <+> renderSQL parent

468− <+> parenthesized (renderSQL refs)

469− <+> renderSQL ondel

470− <+> renderSQL onupd

471−

472−-- | A constraint synonym between types involved in a foreign key constraint.

473−type ForeignKeyed schemas

474− sch

475− schema

476− child parent

477− table reftable

478− columns refcolumns

479− constraints cols

480− reftys tys =

481− ( Has sch schemas schema

482− , Has child schema ('Table table)

483− , Has parent schema ('Table reftable)

484− , HasAll columns (TableToColumns table) tys

485− , reftable ~ (constraints :=> cols)

486− , HasAll refcolumns cols reftys

487− , SOP.AllZip SamePGType tys reftys

488− , Uniquely refcolumns constraints )

489−

490−-- | `OnDeleteClause` indicates what to do with rows that reference a deleted row.

491−data OnDeleteClause

492− = OnDeleteNoAction

493− -- ^ if any referencing rows still exist when the constraint is checked,

494− -- an error is raised

495− | OnDeleteRestrict -- ^ prevents deletion of a referenced row

496− | OnDeleteCascade

497− -- ^ specifies that when a referenced row is deleted,

498− -- row(s) referencing it should be automatically deleted as well

499− deriving (GHC.Generic,Show,Eq,Ord)

500−instance NFData OnDeleteClause

501−-- | Render `OnDeleteClause`.

502−instance RenderSQL OnDeleteClause where

503− renderSQL = \case

504− OnDeleteNoAction -> "ON DELETE NO ACTION"

505− OnDeleteRestrict -> "ON DELETE RESTRICT"

506− OnDeleteCascade -> "ON DELETE CASCADE"

507−

508−-- | Analagous to `OnDeleteClause` there is also `OnUpdateClause` which is invoked

509−-- when a referenced column is changed (updated).

510−data OnUpdateClause

511− = OnUpdateNoAction

512− -- ^ if any referencing rows has not changed when the constraint is checked,

513− -- an error is raised

514− | OnUpdateRestrict -- ^ prevents update of a referenced row

515− | OnUpdateCascade

516− -- ^ the updated values of the referenced column(s) should be copied

517− -- into the referencing row(s)

518− deriving (GHC.Generic,Show,Eq,Ord)

519−instance NFData OnUpdateClause

520−

521−-- | Render `OnUpdateClause`.

522−instance RenderSQL OnUpdateClause where

523− renderSQL = \case

524− OnUpdateNoAction -> "ON UPDATE NO ACTION"

525− OnUpdateRestrict -> "ON UPDATE RESTRICT"

526− OnUpdateCascade -> "ON UPDATE CASCADE"

527−

528−{-----------------------------------------

529−DROP statements

530−-----------------------------------------}

531−

532−-- >>> :{

533−-- let

534−-- definition :: Definition '["muh_schema" ::: schema, "public" ::: public] '["public" ::: public]

535−-- definition = dropSchema #muh_schema

536−-- :}

537−--

538−-- >>> printSQL definition

539−-- DROP SCHEMA "muh_schema";

540−dropSchema

541− :: Has sch schemas schema

542− => Alias sch

543− -> Definition schemas (Drop sch schemas)

544−dropSchema sch = UnsafeDefinition $ "DROP SCHEMA" <+> renderSQL sch <> ";"

545−

546−-- | `dropTable` removes a table from the schema.

547−--

548−-- >>> :{

549−-- let

550−-- definition :: Definition '["public" ::: '["muh_table" ::: 'Table t]] (Public '[])

551−-- definition = dropTable #muh_table

552−-- :}

553−--

554−-- >>> printSQL definition

555−-- DROP TABLE "muh_table";

556−dropTable

557− :: ( Has sch schemas schema

558− , Has tab schema ('Table table))

559− => QualifiedAlias sch tab -- ^ table to remove

560− -> Definition schemas (Alter sch (Drop tab schema) schemas)

561−dropTable tab = UnsafeDefinition $ "DROP TABLE" <+> renderSQL tab <> ";"

562−

563−{-----------------------------------------

564−ALTER statements

565−-----------------------------------------}

566−

567−-- | `alterTable` changes the definition of a table from the schema.

568−alterTable

569− :: (Has sch schemas schema, Has tab schema ('Table table0))

570− => QualifiedAlias sch tab -- ^ table to alter

571− -> AlterTable sch tab schemas table1 -- ^ alteration to perform

572− -> Definition schemas (Alter sch (Alter tab ('Table table1) schema) schemas)

573−alterTable tab alteration = UnsafeDefinition $

574− "ALTER TABLE"

575− <+> renderSQL tab

576− <+> renderAlterTable alteration

577− <> ";"

578−

579−-- | `alterTableRename` changes the name of a table from the schema.

580−--

581−-- >>> printSQL $ alterTableRename #foo #bar

582−-- ALTER TABLE "foo" RENAME TO "bar";

583−alterTableRename

584− :: (KnownSymbol table0, KnownSymbol table1)

585− => Alias table0 -- ^ table to rename

586− -> Alias table1 -- ^ what to rename it

587− -> Definition schema (Rename table0 table1 schema)

588−alterTableRename table0 table1 = UnsafeDefinition $

589− "ALTER TABLE" <+> renderSQL table0

590− <+> "RENAME TO" <+> renderSQL table1 <> ";"

591−

592−-- | An `AlterTable` describes the alteration to perform on the columns

593−-- of a table.

594−newtype AlterTable

595− (sch :: Symbol)

596− (tab :: Symbol)

597− (schemas :: SchemasType)

598− (table :: TableType) =

599− UnsafeAlterTable {renderAlterTable :: ByteString}

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

601−

602−-- | An `addConstraint` adds a table constraint.

603−--

604−-- >>> :{

605−-- let

606−-- definition :: Definition

607−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

608−-- '["public" ::: '["tab" ::: 'Table ('["positive" ::: 'Check '["col"]] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

609−-- definition = alterTable #tab (addConstraint #positive (check #col (#col .> 0)))

610−-- in printSQL definition

611−-- :}

612−-- ALTER TABLE "tab" ADD CONSTRAINT "positive" CHECK (("col" > 0));

613−addConstraint

614− :: ( KnownSymbol alias

615− , Has sch schemas schema

616− , Has tab schema ('Table table0)

617− , table0 ~ (constraints :=> columns)

618− , table1 ~ (Create alias constraint constraints :=> columns) )

619− => Alias alias

620− -> TableConstraintExpression sch tab schemas constraint

621− -- ^ constraint to add

622− -> AlterTable sch tab schemas table1

623−addConstraint alias constraint = UnsafeAlterTable $

624− "ADD" <+> "CONSTRAINT" <+> renderSQL alias

625− <+> renderSQL constraint

626−

627−-- | A `dropConstraint` drops a table constraint.

628−--

629−-- >>> :{

630−-- let

631−-- definition :: Definition

632−-- '["public" ::: '["tab" ::: 'Table ('["positive" ::: Check '["col"]] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

633−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

634−-- definition = alterTable #tab (dropConstraint #positive)

635−-- in printSQL definition

636−-- :}

637−-- ALTER TABLE "tab" DROP CONSTRAINT "positive";

638−dropConstraint

639− :: ( KnownSymbol constraint

640− , Has sch schemas schema

641− , Has tab schema ('Table table0)

642− , table0 ~ (constraints :=> columns)

643− , table1 ~ (Drop constraint constraints :=> columns) )

644− => Alias constraint

645− -- ^ constraint to drop

646− -> AlterTable sch tab schemas table1

647−dropConstraint constraint = UnsafeAlterTable $

648− "DROP" <+> "CONSTRAINT" <+> renderSQL constraint

649−

650−-- | An `AddColumn` is either @NULL@ or has @DEFAULT@.

651−class AddColumn ty where

652− -- | `addColumn` adds a new column, initially filled with whatever

653− -- default value is given or with @NULL@.

654− --

655− -- >>> :{

656− -- let

657− -- definition :: Definition

658− -- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col1" ::: 'NoDef :=> 'Null 'PGint4])]]

659− -- '["public" ::: '["tab" ::: 'Table ('[] :=>

660− -- '[ "col1" ::: 'NoDef :=> 'Null 'PGint4

661− -- , "col2" ::: 'Def :=> 'Null 'PGtext ])]]

662− -- definition = alterTable #tab (addColumn #col2 (text & nullable & default_ "foo"))

663− -- in printSQL definition

664− -- :}

665− -- ALTER TABLE "tab" ADD COLUMN "col2" text NULL DEFAULT E'foo';

666− --

667− -- >>> :{

668− -- let

669− -- definition :: Definition

670− -- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col1" ::: 'NoDef :=> 'Null 'PGint4])]]

671− -- '["public" ::: '["tab" ::: 'Table ('[] :=>

672− -- '[ "col1" ::: 'NoDef :=> 'Null 'PGint4

673− -- , "col2" ::: 'NoDef :=> 'Null 'PGtext ])]]

674− -- definition = alterTable #tab (addColumn #col2 (text & nullable))

675− -- in printSQL definition

676− -- :}

677− -- ALTER TABLE "tab" ADD COLUMN "col2" text NULL;

678− addColumn

679− :: ( KnownSymbol column

680− , Has sch schemas schema

681− , Has tab schema ('Table table0)

682− , table0 ~ (constraints :=> columns) )

683− => Alias column -- ^ column to add

684− -> ColumnTypeExpression schemas ty -- ^ type of the new column

685− -> AlterTable sch tab schemas (constraints :=> Create column ty columns)

686− addColumn column ty = UnsafeAlterTable $

687− "ADD COLUMN" <+> renderSQL column <+> renderColumnTypeExpression ty

688−instance {-# OVERLAPPING #-} AddColumn ('Def :=> ty)

689−instance {-# OVERLAPPABLE #-} AddColumn ('NoDef :=> 'Null ty)

690−

691−-- | A `dropColumn` removes a column. Whatever data was in the column

692−-- disappears. Table constraints involving the column are dropped, too.

693−-- However, if the column is referenced by a foreign key constraint of

694−-- another table, PostgreSQL will not silently drop that constraint.

695−--

696−-- >>> :{

697−-- let

698−-- definition :: Definition

699−-- '["public" ::: '["tab" ::: 'Table ('[] :=>

700−-- '[ "col1" ::: 'NoDef :=> 'Null 'PGint4

701−-- , "col2" ::: 'NoDef :=> 'Null 'PGtext ])]]

702−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col1" ::: 'NoDef :=> 'Null 'PGint4])]]

703−-- definition = alterTable #tab (dropColumn #col2)

704−-- in printSQL definition

705−-- :}

706−-- ALTER TABLE "tab" DROP COLUMN "col2";

707−dropColumn

708− :: ( KnownSymbol column

709− , Has sch schemas schema

710− , Has tab schema ('Table table0)

711− , table0 ~ (constraints :=> columns)

712− , table1 ~ (constraints :=> Drop column columns) )

713− => Alias column -- ^ column to remove

714− -> AlterTable sch tab schemas table1

715−dropColumn column = UnsafeAlterTable $

716− "DROP COLUMN" <+> renderSQL column

717−

718−-- | A `renameColumn` renames a column.

719−--

720−-- >>> :{

721−-- let

722−-- definition :: Definition

723−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["foo" ::: 'NoDef :=> 'Null 'PGint4])]]

724−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["bar" ::: 'NoDef :=> 'Null 'PGint4])]]

725−-- definition = alterTable #tab (renameColumn #foo #bar)

726−-- in printSQL definition

727−-- :}

728−-- ALTER TABLE "tab" RENAME COLUMN "foo" TO "bar";

729−renameColumn

730− :: ( KnownSymbol column0

731− , KnownSymbol column1

732− , Has sch schemas schema

733− , Has tab schema ('Table table0)

734− , table0 ~ (constraints :=> columns)

735− , table1 ~ (constraints :=> Rename column0 column1 columns) )

736− => Alias column0 -- ^ column to rename

737− -> Alias column1 -- ^ what to rename the column

738− -> AlterTable sch tab schemas table1

739−renameColumn column0 column1 = UnsafeAlterTable $

740− "RENAME COLUMN" <+> renderSQL column0 <+> "TO" <+> renderSQL column1

741−

742−-- | An `alterColumn` alters a single column.

743−alterColumn

744− :: ( KnownSymbol column

745− , Has sch schemas schema

746− , Has tab schema ('Table table0)

747− , table0 ~ (constraints :=> columns)

748− , Has column columns ty0

749− , table1 ~ (constraints :=> Alter column ty1 columns))

750− => Alias column -- ^ column to alter

751− -> AlterColumn schemas ty0 ty1 -- ^ alteration to perform

752− -> AlterTable sch tab schemas table1

753−alterColumn column alteration = UnsafeAlterTable $

754− "ALTER COLUMN" <+> renderSQL column <+> renderAlterColumn alteration

755−

756−-- | An `AlterColumn` describes the alteration to perform on a single column.

757−newtype AlterColumn (schemas :: SchemasType) (ty0 :: ColumnType) (ty1 :: ColumnType) =

758− UnsafeAlterColumn {renderAlterColumn :: ByteString}

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

760−

761−-- | A `setDefault` sets a new default for a column. Note that this doesn't

762−-- affect any existing rows in the table, it just changes the default for

763−-- future insert and update commands.

764−--

765−-- >>> :{

766−-- let

767−-- definition :: Definition

768−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'Null 'PGint4])]]

769−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'Def :=> 'Null 'PGint4])]]

770−-- definition = alterTable #tab (alterColumn #col (setDefault 5))

771−-- in printSQL definition

772−-- :}

773−-- ALTER TABLE "tab" ALTER COLUMN "col" SET DEFAULT 5;

774−setDefault

775− :: Expression '[] 'Ungrouped '[] schemas '[] '[] ty -- ^ default value to set

776− -> AlterColumn schemas (constraint :=> ty) ('Def :=> ty)

777−setDefault expression = UnsafeAlterColumn $

778− "SET DEFAULT" <+> renderExpression expression

779−

780−-- | A `dropDefault` removes any default value for a column.

781−--

782−-- >>> :{

783−-- let

784−-- definition :: Definition

785−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'Def :=> 'Null 'PGint4])]]

786−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'Null 'PGint4])]]

787−-- definition = alterTable #tab (alterColumn #col dropDefault)

788−-- in printSQL definition

789−-- :}

790−-- ALTER TABLE "tab" ALTER COLUMN "col" DROP DEFAULT;

791−dropDefault :: AlterColumn schemas ('Def :=> ty) ('NoDef :=> ty)

792−dropDefault = UnsafeAlterColumn $ "DROP DEFAULT"

793−

794−-- | A `setNotNull` adds a @NOT NULL@ constraint to a column.

795−-- The constraint will be checked immediately, so the table data must satisfy

796−-- the constraint before it can be added.

797−--

798−-- >>> :{

799−-- let

800−-- definition :: Definition

801−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'Null 'PGint4])]]

802−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

803−-- definition = alterTable #tab (alterColumn #col setNotNull)

804−-- in printSQL definition

805−-- :}

806−-- ALTER TABLE "tab" ALTER COLUMN "col" SET NOT NULL;

807−setNotNull

808− :: AlterColumn schemas (constraint :=> 'Null ty) (constraint :=> 'NotNull ty)

809−setNotNull = UnsafeAlterColumn $ "SET NOT NULL"

810−

811−-- | A `dropNotNull` drops a @NOT NULL@ constraint from a column.

812−--

813−-- >>> :{

814−-- let

815−-- definition :: Definition

816−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

817−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'Null 'PGint4])]]

818−-- definition = alterTable #tab (alterColumn #col dropNotNull)

819−-- in printSQL definition

820−-- :}

821−-- ALTER TABLE "tab" ALTER COLUMN "col" DROP NOT NULL;

822−dropNotNull

823− :: AlterColumn schemas (constraint :=> 'NotNull ty) (constraint :=> 'Null ty)

824−dropNotNull = UnsafeAlterColumn $ "DROP NOT NULL"

825−

826−-- | An `alterType` converts a column to a different data type.

827−-- This will succeed only if each existing entry in the column can be

828−-- converted to the new type by an implicit cast.

829−--

830−-- >>> :{

831−-- let

832−-- definition :: Definition

833−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGint4])]]

834−-- '["public" ::: '["tab" ::: 'Table ('[] :=> '["col" ::: 'NoDef :=> 'NotNull 'PGnumeric])]]

835−-- definition =

836−-- alterTable #tab (alterColumn #col (alterType (numeric & notNullable)))

837−-- in printSQL definition

838−-- :}

839−-- ALTER TABLE "tab" ALTER COLUMN "col" TYPE numeric NOT NULL;

840−alterType :: ColumnTypeExpression schemas ty -> AlterColumn schemas ty0 ty

841−alterType ty = UnsafeAlterColumn $ "TYPE" <+> renderColumnTypeExpression ty

842−

843−{- | Create a view.

844−>>> type ABC = '["a" ::: 'NoDef :=> 'Null 'PGint4, "b" ::: 'NoDef :=> 'Null 'PGint4, "c" ::: 'NoDef :=> 'Null 'PGint4]

845−>>> type BC = '["b" ::: 'Null 'PGint4, "c" ::: 'Null 'PGint4]

846−>>> :{

847−let

848− definition :: Definition

849− '[ "public" ::: '["abc" ::: 'Table ('[] :=> ABC)]]

850− '[ "public" ::: '["abc" ::: 'Table ('[] :=> ABC), "bc" ::: 'View BC]]

851− definition =

852− createView #bc (select_ (#b :* #c) (from (table #abc)))

853−in printSQL definition

854−:}

855−CREATE VIEW "bc" AS SELECT "b" AS "b", "c" AS "c" FROM "abc" AS "abc";

856−-}

857−createView

858− :: (KnownSymbol sch, KnownSymbol vw, Has sch schemas schema)

859− => QualifiedAlias sch vw -- ^ the name of the view to add

860− -> Query '[] '[] schemas '[] view -- ^ query

861− -> Definition schemas (Alter sch (Create vw ('View view) schema) schemas)

862−createView alias query = UnsafeDefinition $

863− "CREATE" <+> "VIEW" <+> renderSQL alias <+> "AS"

864− <+> renderQuery query <> ";"

865−

866−-- | Drop a view.

867−--

868−-- >>> :{

869−-- let

870−-- definition :: Definition

871−-- '[ "public" ::: '["abc" ::: 'Table ('[] :=> '["a" ::: 'NoDef :=> 'Null 'PGint4, "b" ::: 'NoDef :=> 'Null 'PGint4, "c" ::: 'NoDef :=> 'Null 'PGint4])

872−-- , "bc" ::: 'View ('["b" ::: 'Null 'PGint4, "c" ::: 'Null 'PGint4])]]

873−-- '[ "public" ::: '["abc" ::: 'Table ('[] :=> '["a" ::: 'NoDef :=> 'Null 'PGint4, "b" ::: 'NoDef :=> 'Null 'PGint4, "c" ::: 'NoDef :=> 'Null 'PGint4])]]

874−-- definition = dropView #bc

875−-- in printSQL definition

876−-- :}

877−-- DROP VIEW "bc";

878−dropView

879− :: (Has sch schemas schema, Has vw schema ('View view))

880− => QualifiedAlias sch vw -- ^ view to remove

881− -> Definition schemas (Alter sch (Drop vw schema) schemas)

882−dropView vw = UnsafeDefinition $ "DROP VIEW" <+> renderSQL vw <> ";"

883−

884−-- | Enumerated types are created using the `createTypeEnum` command, for example

885−--

886−-- >>> printSQL $ (createTypeEnum #mood (label @"sad" :* label @"ok" :* label @"happy") :: Definition (Public '[]) '["public" ::: '["mood" ::: 'Typedef ('PGenum '["sad","ok","happy"])]])

887−-- CREATE TYPE "mood" AS ENUM ('sad', 'ok', 'happy');

888−createTypeEnum

889− :: (KnownSymbol enum, Has sch schemas schema, SOP.All KnownSymbol labels)

890− => QualifiedAlias sch enum

891− -- ^ name of the user defined enumerated type

892− -> NP PGlabel labels

893− -- ^ labels of the enumerated type

894− -> Definition schemas (Alter sch (Create enum ('Typedef ('PGenum labels)) schema) schemas)

895−createTypeEnum enum labels = UnsafeDefinition $

896− "CREATE" <+> "TYPE" <+> renderSQL enum <+> "AS" <+> "ENUM" <+>

897− parenthesized (renderSQL labels) <> ";"

898−

899−-- | Enumerated types can also be generated from a Haskell type, for example

900−--

901−-- >>> data Schwarma = Beef | Lamb | Chicken deriving GHC.Generic

902−-- >>> instance SOP.Generic Schwarma

903−-- >>> instance SOP.HasDatatypeInfo Schwarma

904−-- >>> :{

905−-- let

906−-- createSchwarma :: Definition (Public '[]) '["public" ::: '["schwarma" ::: 'Typedef (PG (Enumerated Schwarma))]]

907−-- createSchwarma = createTypeEnumFrom @Schwarma #schwarma

908−-- in

909−-- printSQL createSchwarma

910−-- :}

911−-- CREATE TYPE "schwarma" AS ENUM ('Beef', 'Lamb', 'Chicken');

912−createTypeEnumFrom

913− :: forall hask sch enum schemas schema.

914− ( SOP.Generic hask

915− , SOP.All KnownSymbol (LabelsPG hask)

916− , KnownSymbol enum

917− , Has sch schemas schema )

918− => QualifiedAlias sch enum

919− -- ^ name of the user defined enumerated type

920− -> Definition schemas (Alter sch (Create enum ('Typedef (PG (Enumerated hask))) schema) schemas)

921−createTypeEnumFrom enum = createTypeEnum enum

922− (SOP.hpure label :: NP PGlabel (LabelsPG hask))

923−

924−{- | `createTypeComposite` creates a composite type. The composite type is

925−specified by a list of attribute names and data types.

926−

927−>>> :{

928−type PGcomplex = 'PGcomposite

929− '[ "real" ::: 'NotNull 'PGfloat8

930− , "imaginary" ::: 'NotNull 'PGfloat8 ]

931−:}

932−

933−>>> :{

934−let

935− setup :: Definition (Public '[]) '["public" ::: '["complex" ::: 'Typedef PGcomplex]]

936− setup = createTypeComposite #complex

937− (float8 `as` #real :* float8 `as` #imaginary)

938−in printSQL setup

939−:}

940−CREATE TYPE "complex" AS ("real" float8, "imaginary" float8);

941−-}

942−createTypeComposite

943− :: (KnownSymbol ty, Has sch schemas schema, SOP.SListI fields)

944− => QualifiedAlias sch ty

945− -- ^ name of the user defined composite type

946− -> NP (Aliased (TypeExpression schemas)) fields

947− -- ^ list of attribute names and data types

948− -> Definition schemas (Alter sch (Create ty ('Typedef ('PGcomposite fields)) schema) schemas)

949−createTypeComposite ty fields = UnsafeDefinition $

950− "CREATE" <+> "TYPE" <+> renderSQL ty <+> "AS" <+> parenthesized

951− (renderCommaSeparated renderField fields) <> ";"

952− where

953− renderField :: Aliased (TypeExpression schemas) x -> ByteString

954− renderField (typ `As` alias) =

955− renderSQL alias <+> renderSQL typ

956−

957−-- | Composite types can also be generated from a Haskell type, for example

958−--

959−-- >>> data Complex = Complex {real :: Double, imaginary :: Double} deriving GHC.Generic

960−-- >>> instance SOP.Generic Complex

961−-- >>> instance SOP.HasDatatypeInfo Complex

962−-- >>> type Schema = '["complex" ::: 'Typedef (PG (Composite Complex))]

963−-- >>> :{

964−-- let

965−-- createComplex :: Definition (Public '[]) (Public Schema)

966−-- createComplex = createTypeCompositeFrom @Complex #complex

967−-- in

968−-- printSQL createComplex

969−-- :}

970−-- CREATE TYPE "complex" AS ("real" float8, "imaginary" float8);

971−createTypeCompositeFrom

972− :: forall hask sch ty schemas schema.

973− ( SOP.All (FieldTyped schemas) (RowPG hask)

974− , KnownSymbol ty

975− , Has sch schemas schema )

976− => QualifiedAlias sch ty

977− -- ^ name of the user defined composite type

978− -> Definition schemas (Alter sch (Create ty ( 'Typedef (PG (Composite hask))) schema) schemas)

979−createTypeCompositeFrom ty = createTypeComposite ty

980− (SOP.hcpure (SOP.Proxy :: SOP.Proxy (FieldTyped schemas)) fieldtype

981− :: NP (Aliased (TypeExpression schemas)) (RowPG hask))

982−

983−class FieldTyped schemas ty where

984− fieldtype :: Aliased (TypeExpression schemas) ty

985−instance (KnownSymbol alias, PGTyped schemas ty)

986− => FieldTyped schemas (alias ::: ty) where

987− fieldtype = pgtype `As` Alias

988−

989−-- | Drop a type.

990−--

991−-- >>> data Schwarma = Beef | Lamb | Chicken deriving GHC.Generic

992−-- >>> instance SOP.Generic Schwarma

993−-- >>> instance SOP.HasDatatypeInfo Schwarma

994−-- >>> printSQL (dropType #schwarma :: Definition '["public" ::: '["schwarma" ::: 'Typedef (PG (Enumerated Schwarma))]] (Public '[]))

995−-- DROP TYPE "schwarma";

996−dropType

997− :: (Has sch schemas schema, Has td schema ('Typedef ty))

998− => QualifiedAlias sch td

999− -- ^ name of the user defined type

1000− -> Definition schemas (Alter sch (Drop td schema) schemas)

1001−dropType tydef = UnsafeDefinition $ "DROP" <+> "TYPE" <+> renderSQL tydef <> ";"

1002−

1003−-- | `ColumnTypeExpression`s are used in `createTable` commands.

1004−newtype ColumnTypeExpression (schemas :: SchemasType) (ty :: ColumnType)

1005− = UnsafeColumnTypeExpression { renderColumnTypeExpression :: ByteString }

1006− deriving (GHC.Generic,Show,Eq,Ord,NFData)

1007−instance RenderSQL (ColumnTypeExpression schemas ty) where

1008− renderSQL = renderColumnTypeExpression

1009−

1010−-- | used in `createTable` commands as a column constraint to note that

1011−-- @NULL@ may be present in a column

1012−nullable

1013− :: TypeExpression schemas (nullity ty)

1014− -> ColumnTypeExpression schemas ('NoDef :=> 'Null ty)

1015−nullable ty = UnsafeColumnTypeExpression $ renderSQL ty <+> "NULL"

1016−

1017−-- | used in `createTable` commands as a column constraint to ensure

1018−-- @NULL@ is not present in a column

1019−notNullable

1020− :: TypeExpression schemas (nullity ty)

1021− -> ColumnTypeExpression schemas ('NoDef :=> 'NotNull ty)

1022−notNullable ty = UnsafeColumnTypeExpression $ renderSQL ty <+> "NOT NULL"

1023−

1024−-- | used in `createTable` commands as a column constraint to give a default

1025−default_

1026− :: Expression '[] 'Ungrouped '[] schemas '[] '[] ty

1027− -> ColumnTypeExpression schemas ('NoDef :=> ty)

1028− -> ColumnTypeExpression schemas ('Def :=> ty)

1029−default_ x ty = UnsafeColumnTypeExpression $

1030− renderSQL ty <+> "DEFAULT" <+> renderExpression x

1031−

1032−-- | not a true type, but merely a notational convenience for creating

1033−-- unique identifier columns with type `PGint2`

1034−serial2, smallserial

1035− :: ColumnTypeExpression schemas ('Def :=> 'NotNull 'PGint2)

1036−serial2 = UnsafeColumnTypeExpression "serial2"

1037−smallserial = UnsafeColumnTypeExpression "smallserial"

1038−-- | not a true type, but merely a notational convenience for creating

1039−-- unique identifier columns with type `PGint4`

1040−serial4, serial

1041− :: ColumnTypeExpression schemas ('Def :=> 'NotNull 'PGint4)

1042−serial4 = UnsafeColumnTypeExpression "serial4"

1043−serial = UnsafeColumnTypeExpression "serial"

1044−-- | not a true type, but merely a notational convenience for creating

1045−-- unique identifier columns with type `PGint8`

1046−serial8, bigserial

1047− :: ColumnTypeExpression schemas ('Def :=> 'NotNull 'PGint8)

1048−serial8 = UnsafeColumnTypeExpression "serial8"

1049−bigserial = UnsafeColumnTypeExpression "bigserial"

squeal-postgresql/src/Squeal/PostgreSQL/Definition/Function.hsnew file+238

@@ -0,0 +1,238 @@

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

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.hsnew file+159

@@ -0,0 +1,159 @@

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

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.hsnew file+96

@@ -0,0 +1,96 @@

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

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.hsnew file+500

@@ -0,0 +1,500 @@

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

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.hsnew file+339

@@ -0,0 +1,339 @@

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

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.hsnew file+229

@@ -0,0 +1,229 @@

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

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.hsnew file+104

@@ -0,0 +1,104 @@

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

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+249−2062

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

1{-|

2Module: Squeal.PostgreSQL.Expression

3Description: Squeal expressions

4−Copyright: (c) Eitan Chatav, 2017

4+Copyright: (c) Eitan Chatav, 2019

5Maintainer: eitan@morphism.tech

6Stability: experimental

8Squeal expressions are the atoms used to build statements.

9-}

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

12{-# LANGUAGE

11{-# LANGUAGE

13 AllowAmbiguousTypes

12 AllowAmbiguousTypes

14 , ConstraintKinds

13 , ConstraintKinds

@@ -34,293 +33,214 @@ Squeal expressions are the atoms used to build statements.

34module Squeal.PostgreSQL.Expression

33module Squeal.PostgreSQL.Expression

35 ( -- * Expression

34 ( -- * Expression

36 Expression (..)

35 Expression (..)

37− , HasParameter (parameter)

36+ , Expr

38− , param

37+ , type (-->)

39− -- ** Null

38+ , FunctionDB

40− , null_

41− , notNull

42− , coalesce

43− , fromNull

44− , isNull

45− , isNotNull

46− , matchNull

47− , nullIf

48− -- ** Collections

49− , array

50− , cardinality

51− , index

52− , row

53− , field

54− -- ** Functions

55− , unsafeBinaryOp

56− , unsafeUnaryOp

57 , unsafeFunction

39 , unsafeFunction

58− , unsafeVariadicFunction

40+ , function

59− , atan2_

41+ , unsafeLeftOp

60− , cast

42+ , leftOp

61− , quot_

43+ , unsafeRightOp

62− , rem_

44+ , rightOp

63− , trunc

45+ , Operator

64− , round_

46+ , OperatorDB

65− , ceiling_

47+ , unsafeBinaryOp

66− , greatest

48+ , binaryOp

67− , least

49+ , FunctionVar

68− -- ** Conditions

50+ , unsafeFunctionVar

69− , true

51+ , type (--->)

70− , false

52+ , FunctionNDB

71− , not_

53+ , unsafeFunctionN

72− , (.&&)

54+ , functionN

73− , (.||)

55+ , PGSubset (..)

74− , Condition

56+ , PGIntersect (..)

75− , caseWhenThenElse

76− , ifThenElse

77− , (.==)

78− , (./=)

79− , (.>=)

80− , (.<)

81− , (.<=)

82− , (.>)

83− -- ** Time

84− , currentDate

85− , currentTime

86− , currentTimestamp

87− , localTime

88− , localTimestamp

89− -- ** Text

90− , lower

91− , upper

92− , charLength

93− , like

94− , ilike

95− -- ** Json

96− -- *** Json and Jsonb operators

97− , (.->)

98− , (.->>)

99− , (.#>)

100− , (.#>>)

101− -- *** Jsonb operators

102− , (.@>)

103− , (.<@)

104− , (.?)

105− , (.?|)

106− , (.?&)

107− , (.-.)

108− , (#-.)

109− -- *** Functions

110− , jsonLit

111− , jsonbLit

112− , toJson

113− , toJsonb

114− , arrayToJson

115− , rowToJson

116− , jsonBuildArray

117− , jsonbBuildArray

118− , jsonBuildObject

119− , jsonbBuildObject

120− , jsonObject

121− , jsonbObject

122− , jsonZipObject

123− , jsonbZipObject

124− , jsonArrayLength

125− , jsonbArrayLength

126− , jsonExtractPath

127− , jsonbExtractPath

128− , jsonExtractPathAsText

129− , jsonbExtractPathAsText

130− , jsonTypeof

131− , jsonbTypeof

132− , jsonStripNulls

133− , jsonbStripNulls

134− , jsonbSet

135− , jsonbInsert

136− , jsonbPretty

137− -- ** Aggregation

138− , Aggregate (..)

139− , Distinction (..)

140− , PGAvg

141− -- * Window Functions

142− , WindowDefinition (..)

143− , partitionBy

144− , WindowFunction (..)

145− , rank

146− , rowNumber

147− , denseRank

148− , percentRank

149− , cumeDist

150− , ntile

151− , lag

152− , lead

153− , firstValue

154− , lastValue

155− , nthValue

156− -- * Sorting

157− , SortExpression (..)

158− , OrderBy (..)

159− -- * Types

160− , TypeExpression (..)

161− , PGTyped (..)

162− , typedef

163− , typetable

164− , typeview

165− , bool

166− , int2

167− , smallint

168− , int4

169− , int

170− , integer

171− , int8

172− , bigint

173− , numeric

174− , float4

175− , real

176− , float8

177− , doublePrecision

178− , money

179− , text

180− , char

181− , character

182− , varchar

183− , characterVarying

184− , bytea

185− , timestamp

186− , timestampWithTimeZone

187− , date

188− , time

189− , timeWithTimeZone

190− , interval

191− , uuid

192− , inet

193− , json

194− , jsonb

195− , vararray

196− , fixarray

197 -- * Re-export

57 -- * Re-export

198 , (&)

58 , (&)

199− , NP (..)

200− , (:*:) (..)

201 , K (..)

59 , K (..)

60+ , unK

202 ) where

61 ) where

203

204import Control.Category

63import Control.Category

205import Control.DeepSeq

64import Control.DeepSeq

206import Data.ByteString (ByteString)

65import Data.ByteString (ByteString)

207−import Data.ByteString.Lazy (toStrict)

208import Data.Function ((&))

66import Data.Function ((&))

209import Data.Semigroup hiding (All)

67import Data.Semigroup hiding (All)

210−import qualified Data.Aeson as JSON

211−import Data.Ratio

212import Data.String

68import Data.String

213−import Data.Word

214import Generics.SOP hiding (All, from)

69import Generics.SOP hiding (All, from)

215−import GHC.Generics ((:*:) (..))

216import GHC.OverloadedLabels

70import GHC.OverloadedLabels

217import GHC.TypeLits

71import GHC.TypeLits

72+import Numeric

218import Prelude hiding (id, (.))

73import Prelude hiding (id, (.))

219

220−import qualified Data.ByteString as ByteString

221import qualified GHC.Generics as GHC

75import qualified GHC.Generics as GHC

222−import qualified Generics.SOP as SOP

223

77+import Squeal.PostgreSQL.Alias

78+import Squeal.PostgreSQL.List

224import Squeal.PostgreSQL.Render

79import Squeal.PostgreSQL.Render

225import Squeal.PostgreSQL.Schema

80import Squeal.PostgreSQL.Schema

226

82+-- $setup

83+-- >>> import Squeal.PostgreSQL

84+

227{-----------------------------------------

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

228column expressions

86column expressions

229-----------------------------------------}

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

230

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

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

90+such as in the target `Squeal.PostgreSQL.Query.List` of the

232−such as in the target list of the `Squeal.PostgreSQL.Query.select` command,

91+`Squeal.PostgreSQL.Query.select` command,

233as new column values in `Squeal.PostgreSQL.Manipulation.insertRow` or

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

234`Squeal.PostgreSQL.Manipulation.update`,

93`Squeal.PostgreSQL.Manipulation.update`,

235−or in search `Condition`s in a number of commands.

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

236

237The expression syntax allows the calculation of

96The expression syntax allows the calculation of

238values from primitive expression using arithmetic, logical,

97values from primitive expression using arithmetic, logical,

239and other operations.

98and 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`.

240-}

113-}

241newtype Expression

114newtype Expression

242 (outer :: FromType)

115 (outer :: FromType)

243− (grp :: Grouping)

244 (commons :: FromType)

116 (commons :: FromType)

117+ (grp :: Grouping)

245 (schemas :: SchemasType)

118 (schemas :: SchemasType)

246 (params :: [NullityType])

119 (params :: [NullityType])

247 (from :: FromType)

120 (from :: FromType)

248 (ty :: NullityType)

121 (ty :: NullityType)

249 = UnsafeExpression { renderExpression :: ByteString }

122 = UnsafeExpression { renderExpression :: ByteString }

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

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

251−

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

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

253 renderSQL = renderExpression

125 renderSQL = renderExpression

254

126

255−{- | A `HasParameter` constraint is used to indicate a value that is

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

256−supplied externally to a SQL statement.

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

257−`Squeal.PostgreSQL.PQ.manipulateParams`,

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

258−`Squeal.PostgreSQL.PQ.queryParams` and

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

259−`Squeal.PostgreSQL.PQ.traversePrepared` support specifying data values

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

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

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

261−refer to the out-of-line data values.

133+type Expr x

134+ = forall outer commons grp schemas params from

135+ . Expression outer commons grp schemas params from x

136+ -- ^ cannot reference aliases

137+

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

139+type Operator x1 x2 y

140+ = forall outer commons grp schemas params from

141+ . Expression outer commons grp schemas params from x1

142+ -- ^ left input

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

144+ -- ^ right input

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

146+ -- ^ output

147+

148+type OperatorDB schemas x1 x2 y

149+ = forall outer commons grp params from

150+ . Expression outer commons grp schemas params from x1

151+ -- ^ left input

152+ -> Expression outer commons grp schemas params from x2

153+ -- ^ right input

154+ -> Expression outer commons grp schemas params from y

155+ -- ^ output

156+

157+-- | A @RankNType@ for functions with a single argument.

158+-- These could be either function calls or unary operators.

159+-- This is a subtype of the usual Haskell function type `Prelude.->`,

160+-- indeed a subcategory as it is closed under the usual

161+-- `Prelude..` and `Prelude.id`.

162+type (-->) x y

163+ = forall outer commons grp schemas params from

164+ . Expression outer commons grp schemas params from x

165+ -- ^ input

166+ -> Expression outer commons grp schemas params from y

167+ -- ^ output

168+

169+type FunctionDB schemas x y

170+ = forall outer commons grp params from

171+ . Expression outer commons grp schemas params from x

172+ -- ^ input

173+ -> Expression outer commons grp schemas params from y

174+ -- ^ output

175+

176+{- | A @RankNType@ for functions with a fixed-length list of heterogeneous arguments.

177+Use the `*:` operator to end your argument lists, like so.

178+

179+>>> printSQL (unsafeFunctionN "fun" (true :* false :* localTime *: true))

180+fun(TRUE, FALSE, LOCALTIME, TRUE)

262-}

181-}

263−class KnownNat n => HasParameter

182+type (--->) xs y

264− (n :: Nat)

183+ = forall outer commons grp schemas params from

265− (params :: [NullityType])

184+ . NP (Expression outer commons grp schemas params from) xs

266− (ty :: NullityType)

185+ -- ^ inputs

267− | n params -> ty where

186+ -> Expression outer commons grp schemas params from y

268− -- | `parameter` takes a `Nat` using type application and a `TypeExpression`.

187+ -- ^ output

269− --

188+

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

189+type FunctionNDB schemas xs y

271− -- >>> printSQL expr

190+ = forall outer commons grp params from

272− -- ($1 :: int4)

191+ . NP (Expression outer commons grp schemas params from) xs

273− parameter

192+ -- ^ inputs

274− :: TypeExpression schemas ty

193+ -> Expression outer commons grp schemas params from y

194+ -- ^ output

195+

196+{- | A @RankNType@ for functions with a variable-length list of

197+homogeneous arguments and at least 1 more argument.

198+-}

199+type FunctionVar x0 x1 y

200+ = forall outer commons grp schemas params from

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

202+ -- ^ inputs

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

204+ -- ^ must have at least 1 input

275− -> Expression outer grp commons schemas params from ty

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

206+ -- ^ output

207+

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

209+greatest(TRUE, NULL, FALSE)

210+-}

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

276− parameter ty = UnsafeExpression $ parenthesized $

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

277− "$" <> renderNat @n <+> "::"

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

278− <+> renderSQL ty

279−instance {-# OVERLAPPING #-} HasParameter 1 (ty1:tys) ty1

280−instance {-# OVERLAPPABLE #-} (KnownNat n, HasParameter (n-1) params ty)

281− => HasParameter n (ty' : params) ty

282−

283−-- | `param` takes a `Nat` using type application and for basic types,

284−-- infers a `TypeExpression`.

285−--

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

287−-- >>> printSQL expr

288−-- ($1 :: int4)

289−param

290− :: forall n outer commons schemas params from grp ty

291− . (PGTyped schemas ty, HasParameter n params ty)

292− => Expression outer grp commons schemas params from ty -- ^ param

293−param = parameter @n (pgtype @schemas)

294

214

295instance (HasUnique tab (Join outer from) row, Has col row ty)

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

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

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

297 fromLabel = UnsafeExpression $ renderSQL (Alias @col)

217 fromLabel = UnsafeExpression $ renderSQL (Alias @col)

298instance (HasUnique tab (Join outer from) row, Has col row ty, tys ~ '[ty])

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

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

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

300 fromLabel = fromLabel @col :* Nil

220 fromLabel = fromLabel @col :* Nil

301instance (HasUnique tab (Join outer from) row, Has col row ty, column ~ (col ::: ty))

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

302 => IsLabel col

222 => IsLabel col

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

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

304 fromLabel = fromLabel @col `As` Alias

224 fromLabel = fromLabel @col `As` Alias

305instance (HasUnique tab (Join outer from) row, Has col row ty, columns ~ '[col ::: ty])

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

306 => IsLabel col

226 => IsLabel col

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

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

308 fromLabel = fromLabel @col :* Nil

228 fromLabel = fromLabel @col :* Nil

309

229

310instance (Has tab (Join outer from) row, Has col row ty)

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

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

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

312 tab ! col = UnsafeExpression $

232 tab ! col = UnsafeExpression $

313 renderSQL tab <> "." <> renderSQL col

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

314instance (Has tab (Join outer from) row, Has col row ty, tys ~ '[ty])

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

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

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

316 tab ! col = tab ! col :* Nil

236 tab ! col = tab ! col :* Nil

317instance (Has tab (Join outer from) row, Has col row ty, column ~ (col ::: ty))

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

318 => IsQualified tab col

238 => IsQualified tab col

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

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

320 tab ! col = tab ! col `As` col

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

321instance (Has tab (Join outer from) row, Has col row ty, columns ~ '[col ::: ty])

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

322 => IsQualified tab col

242 => IsQualified tab col

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

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

324 tab ! col = tab ! col :* Nil

244 tab ! col = tab ! col :* Nil

325

245

326instance

246instance

@@ -328,7 +248,7 @@ instance

328 , Has col row ty

248 , Has col row ty

329 , GroupedBy tab col bys

249 , GroupedBy tab col bys

330 ) => IsLabel col

250 ) => IsLabel col

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

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

332 fromLabel = UnsafeExpression $ renderSQL (Alias @col)

252 fromLabel = UnsafeExpression $ renderSQL (Alias @col)

333instance

253instance

334 ( HasUnique tab (Join outer from) row

254 ( HasUnique tab (Join outer from) row

@@ -336,7 +256,7 @@ instance

336 , GroupedBy tab col bys

256 , GroupedBy tab col bys

337 , tys ~ '[ty]

257 , tys ~ '[ty]

338 ) => IsLabel col

258 ) => IsLabel col

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

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

340 fromLabel = fromLabel @col :* Nil

260 fromLabel = fromLabel @col :* Nil

341instance

261instance

342 ( HasUnique tab (Join outer from) row

262 ( HasUnique tab (Join outer from) row

@@ -344,7 +264,7 @@ instance

344 , GroupedBy tab col bys

264 , GroupedBy tab col bys

345 , column ~ (col ::: ty)

265 , column ~ (col ::: ty)

346 ) => IsLabel col

266 ) => IsLabel col

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

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

348 fromLabel = fromLabel @col `As` Alias

268 fromLabel = fromLabel @col `As` Alias

349instance

269instance

350 ( HasUnique tab (Join outer from) row

270 ( HasUnique tab (Join outer from) row

@@ -352,7 +272,7 @@ instance

352 , GroupedBy tab col bys

272 , GroupedBy tab col bys

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

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

354 ) => IsLabel col

274 ) => IsLabel col

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

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

356 fromLabel = fromLabel @col :* Nil

276 fromLabel = fromLabel @col :* Nil

357

277

358instance

278instance

@@ -360,7 +280,7 @@ instance

360 , Has col row ty

280 , Has col row ty

361 , GroupedBy tab col bys

281 , GroupedBy tab col bys

362 ) => IsQualified tab col

282 ) => IsQualified tab col

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

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

364 tab ! col = UnsafeExpression $

284 tab ! col = UnsafeExpression $

365 renderSQL tab <> "." <> renderSQL col

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

366instance

286instance

@@ -369,7 +289,7 @@ instance

369 , GroupedBy tab col bys

289 , GroupedBy tab col bys

370 , tys ~ '[ty]

290 , tys ~ '[ty]

371 ) => IsQualified tab col

291 ) => IsQualified tab col

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

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

373 tab ! col = tab ! col :* Nil

293 tab ! col = tab ! col :* Nil

374instance

294instance

375 ( Has tab (Join outer from) row

295 ( Has tab (Join outer from) row

@@ -377,7 +297,7 @@ instance

377 , GroupedBy tab col bys

297 , GroupedBy tab col bys

378 , column ~ (col ::: ty)

298 , column ~ (col ::: ty)

379 ) => IsQualified tab col

299 ) => IsQualified tab col

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

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

381 tab ! col = tab ! col `As` col

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

382instance

302instance

383 ( Has tab (Join outer from) row

303 ( Has tab (Join outer from) row

@@ -385,244 +305,78 @@ instance

385 , GroupedBy tab col bys

305 , GroupedBy tab col bys

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

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

387 ) => IsQualified tab col

307 ) => IsQualified tab col

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

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

389 tab ! col = tab ! col :* Nil

309 tab ! col = tab ! col :* Nil

390

310

391−-- | analagous to `Nothing`

392−--

393−-- >>> printSQL null_

394−-- NULL

395−null_ :: Expression outer grp commons schemas params from ('Null ty)

396−null_ = UnsafeExpression "NULL"

397−

398−-- | analagous to `Just`

399−--

400−-- >>> printSQL $ notNull true

401−-- TRUE

402−notNull

403− :: Expression outer grp commons schemas params from ('NotNull ty)

404− -> Expression outer grp commons schemas params from ('Null ty)

405−notNull = UnsafeExpression . renderSQL

406−

407−-- | return the leftmost value which is not NULL

408−--

409−-- >>> printSQL $ coalesce [null_, true] false

410−-- COALESCE(NULL, TRUE, FALSE)

411−coalesce

412− :: [Expression outer grp commons schemas params from ('Null ty)]

413− -- ^ @NULL@s may be present

414− -> Expression outer grp commons schemas params from ('NotNull ty)

415− -- ^ @NULL@ is absent

416− -> Expression outer grp commons schemas params from ('NotNull ty)

417−coalesce nullxs notNullx = UnsafeExpression $

418− "COALESCE" <> parenthesized (commaSeparated

419− ((renderSQL <$> nullxs) <> [renderSQL notNullx]))

420−

421−-- | analagous to `Data.Maybe.fromMaybe` using @COALESCE@

422−--

423−-- >>> printSQL $ fromNull true null_

424−-- COALESCE(NULL, TRUE)

425−fromNull

426− :: Expression outer grp commons schemas params from ('NotNull ty)

427− -- ^ what to convert @NULL@ to

428− -> Expression outer grp commons schemas params from ('Null ty)

429− -> Expression outer grp commons schemas params from ('NotNull ty)

430−fromNull notNullx nullx = coalesce [nullx] notNullx

431−

432−-- | >>> printSQL $ null_ & isNull

433−-- NULL IS NULL

434−isNull

435− :: Expression outer grp commons schemas params from ('Null ty)

436− -- ^ possibly @NULL@

437− -> Condition outer grp commons schemas params from

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

439−

440−-- | >>> printSQL $ null_ & isNotNull

441−-- NULL IS NOT NULL

442−isNotNull

443− :: Expression outer grp commons schemas params from ('Null ty)

444− -- ^ possibly @NULL@

445− -> Condition outer grp commons schemas params from

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

447−

448−-- | analagous to `maybe` using @IS NULL@

449−--

450−-- >>> printSQL $ matchNull true not_ null_

451−-- CASE WHEN NULL IS NULL THEN TRUE ELSE (NOT NULL) END

452−matchNull

453− :: Expression outer grp commons schemas params from (nullty)

454− -- ^ what to convert @NULL@ to

455− -> ( Expression outer grp commons schemas params from ('NotNull ty)

456− -> Expression outer grp commons schemas params from (nullty) )

457− -- ^ function to perform when @NULL@ is absent

458− -> Expression outer grp commons schemas params from ('Null ty)

459− -> Expression outer grp commons schemas params from (nullty)

460−matchNull y f x = ifThenElse (isNull x) y

461− (f (UnsafeExpression (renderSQL x)))

462−

463−{-| right inverse to `fromNull`, if its arguments are equal then

464−`nullIf` gives @NULL@.

465−

466−>>> :set -XTypeApplications -XDataKinds

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

468−>>> printSQL expr

469−NULL IF (FALSE, ($1 :: bool))

470−-}

471−nullIf

472− :: Expression outer grp commons schemas params from ('NotNull ty)

473− -- ^ @NULL@ is absent

474− -> Expression outer grp commons schemas params from ('NotNull ty)

475− -- ^ @NULL@ is absent

476− -> Expression outer grp commons schemas params from ('Null ty)

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

478− (renderSQL x <> ", " <> renderSQL y)

479−

480−-- | >>> printSQL $ array [null_, false, true]

481−-- ARRAY[NULL, FALSE, TRUE]

482−array

483− :: [Expression outer grp commons schemas params from ty]

484− -- ^ array elements

485− -> Expression outer grp commons schemas params from (nullity ('PGvararray ty))

486−array xs = UnsafeExpression $

487− "ARRAY[" <> commaSeparated (renderSQL <$> xs) <> "]"

488−

489−-- | >>> printSQL $ cardinality (array [null_, false, true])

490−-- cardinality(ARRAY[NULL, FALSE, TRUE])

491−cardinality

492− :: Expression outer grp commons schemas params from (nullity ('PGvararray ty))

493− -> Expression outer grp commons schemas params from (nullity 'PGint8)

494−cardinality = unsafeFunction "cardinality"

495−

496−-- | >>> printSQL $ array [null_, false, true] & index 2

497−-- (ARRAY[NULL, FALSE, TRUE])[2]

498−index

499− :: Word64 -- ^ index

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

501− -> Expression outer grp commons schemas params from (NullifyType ty)

502−index n expr = UnsafeExpression $

503− parenthesized (renderSQL expr) <> "[" <> fromString (show n) <> "]"

504−

505instance (KnownSymbol label, label `In` labels) => IsPGlabel label

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

506− (Expression outer grp commons schemas params from (nullity ('PGenum labels))) where

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

507 label = UnsafeExpression $ renderSQL (PGlabel @label)

313 label = UnsafeExpression $ renderSQL (PGlabel @label)

508

314

509−-- | A row constructor is an expression that builds a row value

510−-- (also called a composite value) using values for its member fields.

511−--

512−-- >>> :{

513−-- type Complex = 'PGcomposite

514−-- '[ "real" ::: 'NotNull 'PGfloat8

515−-- , "imaginary" ::: 'NotNull 'PGfloat8 ]

516−-- :}

517−--

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

519−-- >>> printSQL i

520−-- ROW(0, 1)

521−row

522− :: SListI row

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

524− -- ^ zero or more expressions for the row field values

525− -> Expression outer grp commons schemas params from (nullity ('PGcomposite row))

526−row exprs = UnsafeExpression $ "ROW" <> parenthesized

527− (renderCommaSeparated (\ (expr `As` _) -> renderSQL expr) exprs)

528−

529−-- | >>> :{

530−-- type Complex = 'PGcomposite

531−-- '[ "real" ::: 'NotNull 'PGfloat8

532−-- , "imaginary" ::: 'NotNull 'PGfloat8 ]

533−-- type Schema = '["complex" ::: 'Typedef Complex]

534−-- :}

535−--

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

537−-- >>> printSQL $ i & field #complex #imaginary

538−-- (ROW(0, 1)::"complex")."imaginary"

539−field

540− :: ( Has sch schemas schema

541− , Has tydef schema ('Typedef ('PGcomposite row))

542− , Has field row ty)

543− => QualifiedAlias sch tydef -- ^ row type

544− -> Alias field -- ^ field name

545− -> Expression outer grp commons schemas params from ('NotNull ('PGcomposite row))

546− -> Expression outer grp commons schemas params from ty

547−field td fld expr = UnsafeExpression $

548− parenthesized (renderSQL expr <> "::" <> renderSQL td)

549− <> "." <> renderSQL fld

550−

551−instance Semigroup

552− (Expression outer grp commons schemas params from (nullity ('PGvararray ty))) where

553− (<>) = unsafeBinaryOp "||"

554−

555−instance Monoid

556− (Expression outer grp commons schemas params from (nullity ('PGvararray ty))) where

557− mempty = array []

558− mappend = (<>)

559−

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

561−-- >>> printSQL expr

562−-- GREATEST(CURRENT_TIMESTAMP, ($1 :: timestamp with time zone))

563−greatest

564− :: Expression outer grp commons schemas params from (nullty)

565− -- ^ needs at least 1 argument

566− -> [Expression outer grp commons schemas params from (nullty)]

567− -- ^ or more

568− -> Expression outer grp commons schemas params from (nullty)

569−greatest x xs = UnsafeExpression $ "GREATEST("

570− <> commaSeparated (renderSQL <$> (x:xs)) <> ")"

571−

572−-- | >>> printSQL $ least currentTimestamp [null_]

573−-- LEAST(CURRENT_TIMESTAMP, NULL)

574−least

575− :: Expression outer grp commons schemas params from (nullty)

576− -- ^ needs at least 1 argument

577− -> [Expression outer grp commons schemas params from (nullty)]

578− -- ^ or more

579− -> Expression outer grp commons schemas params from (nullty)

580−least x xs = UnsafeExpression $ "LEAST("

581− <> commaSeparated (renderSQL <$> (x:xs)) <> ")"

582−

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

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

584-- (TRUE OR FALSE)

316-- (TRUE OR FALSE)

585−unsafeBinaryOp

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

586− :: ByteString

587− -- ^ operator

588− -> Expression outer grp commons schemas params from (ty0)

589− -> Expression outer grp commons schemas params from (ty1)

590− -> Expression outer grp commons schemas params from (ty2)

591unsafeBinaryOp op x y = UnsafeExpression $ parenthesized $

318unsafeBinaryOp op x y = UnsafeExpression $ parenthesized $

592 renderSQL x <+> op <+> renderSQL y

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

593

320

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+

594−-- | >>> printSQL $ unsafeUnaryOp "NOT" true

328+-- | >>> printSQL $ unsafeLeftOp "NOT" true

595-- (NOT TRUE)

329-- (NOT TRUE)

596−unsafeUnaryOp

597− :: ByteString

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

598− -- ^ operator

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

599− -> Expression outer grp commons schemas params from (ty0)

332+

600− -> Expression outer grp commons schemas params from (ty1)

333+leftOp

334+ :: forall op sch schemas schema x y.

335+ ( Has sch schemas schema

336+ , Has op schema ('Operator ('LeftOp x y)) )

337+ => FunctionDB schemas x y

338+leftOp = unsafeLeftOp $ renderSymbol @op

339+

340+-- | >>> printSQL $ true & unsafeRightOp "IS NOT TRUE"

341+-- (TRUE IS NOT TRUE)

342+unsafeRightOp :: ByteString -> x --> y

601−unsafeUnaryOp op x = UnsafeExpression $ parenthesized $

343+unsafeRightOp op x = UnsafeExpression $ parenthesized $ renderSQL x <+> op

602− op <+> renderSQL x

344+

345+rightOp

346+ :: forall op sch schemas schema x y.

347+ ( Has sch schemas schema

348+ , Has op schema ('Operator ('RightOp x y)) )

349+ => FunctionDB schemas x y

350+rightOp = unsafeRightOp $ renderSymbol @op

603

351

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

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

605-- f(TRUE)

353-- f(TRUE)

606−unsafeFunction

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

607− :: ByteString

608− -- ^ function

609− -> Expression outer grp commons schemas params from (xty)

610− -> Expression outer grp commons schemas params from (yty)

611unsafeFunction fun x = UnsafeExpression $

355unsafeFunction fun x = UnsafeExpression $

612 fun <> parenthesized (renderSQL x)

356 fun <> parenthesized (renderSQL x)

613

357

614−-- | Helper for defining variadic functions.

358+function

615−unsafeVariadicFunction

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

616− :: SListI elems

360+ => QualifiedAlias sch fun

361+ -> FunctionDB schemas x y

362+function = unsafeFunction . renderSQL

363+

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

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

617− => ByteString

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

618− -- ^ function

619− -> NP (Expression outer grp commons schemas params from) elems

620− -> Expression outer grp commons schemas params from ret

621−unsafeVariadicFunction fun x = UnsafeExpression $

367+unsafeFunctionN fun xs = UnsafeExpression $

622− fun <> parenthesized (commaSeparated (hcollapse (hmap (K . renderSQL) x)))

368+ fun <> parenthesized (renderCommaSeparated renderSQL xs)

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

623

377

624instance ty `In` PGNum

378instance ty `In` PGNum

625− => Num (Expression outer grp commons schemas params from (nullity ty)) where

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

626 (+) = unsafeBinaryOp "+"

380 (+) = unsafeBinaryOp "+"

627 (-) = unsafeBinaryOp "-"

381 (-) = unsafeBinaryOp "-"

628 (*) = unsafeBinaryOp "*"

382 (*) = unsafeBinaryOp "*"

@@ -634,12 +388,17 @@ instance ty `In` PGNum

634 . show

388 . show

635

389

636instance (ty `In` PGNum, ty `In` PGFloating) => Fractional

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

637− (Expression outer grp commons schemas params from (nullity ty)) where

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

638 (/) = unsafeBinaryOp "/"

392 (/) = unsafeBinaryOp "/"

639− fromRational x = fromInteger (numerator x) / fromInteger (denominator x)

393+ fromRational

394+ = UnsafeExpression

395+ . fromString

396+ . ($ "")

397+ . showFFloat Nothing

398+ . fromRat @Double

640

399

641instance (ty `In` PGNum, ty `In` PGFloating) => Floating

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

642− (Expression outer grp commons schemas params from (nullity ty)) where

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

643 pi = UnsafeExpression "pi()"

402 pi = UnsafeExpression "pi()"

644 exp = unsafeFunction "exp"

403 exp = unsafeFunction "exp"

645 log = unsafeFunction "ln"

404 log = unsafeFunction "ln"

@@ -660,1626 +419,54 @@ instance (ty `In` PGNum, ty `In` PGFloating) => Floating

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

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

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

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

662

421

663−-- | >>> :{

422+-- | Contained by operators

664−-- let

423+class PGSubset ty where

665−-- expression :: Expression outer grp commons schemas params from (nullity 'PGfloat4)

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

666−-- expression = atan2_ pi 2

425+ (@>) = unsafeBinaryOp "@>"

667−-- in printSQL expression

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

668−-- :}

427+ (<@) = unsafeBinaryOp "<@"

669−-- atan2(pi(), 2)

428+instance PGSubset 'PGjsonb

670−atan2_

429+instance PGSubset 'PGtsquery

671− :: float `In` PGFloating

430+instance PGSubset ('PGvararray ty)

672− => Expression outer grp commons schemas params from (nullity float)

431+instance PGSubset ('PGrange ty)

673− -- ^ numerator

432+

674− -> Expression outer grp commons schemas params from (nullity float)

433+class PGIntersect ty where

675− -- ^ denominator

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

676− -> Expression outer grp commons schemas params from (nullity float)

435+ (@&&) = unsafeBinaryOp "&&"

677−atan2_ y x = UnsafeExpression $

436+instance PGIntersect ('PGvararray ty)

678− "atan2(" <> renderSQL y <> ", " <> renderSQL x <> ")"

437+instance PGIntersect ('PGrange ty)

679−

680−-- When a `cast` is applied to an `Expression` of a known type, it

681−-- represents a run-time type conversion. The cast will succeed only if a

682−-- suitable type conversion operation has been defined.

683−--

684−-- | >>> printSQL $ true & cast int4

685−-- (TRUE :: int4)

686−cast

687− :: TypeExpression schemas ty1

688− -- ^ type to cast as

689− -> Expression outer grp commons schemas params from ty0

690− -- ^ value to convert

691− -> Expression outer grp commons schemas params from ty1

692−cast ty x = UnsafeExpression $ parenthesized $

693− renderSQL x <+> "::" <+> renderSQL ty

694−

695−-- | integer division, truncates the result

696−--

697−-- >>> :{

698−-- let

699−-- expression :: Expression outer grp commons schemas params from (nullity 'PGint2)

700−-- expression = 5 `quot_` 2

701−-- in printSQL expression

702−-- :}

703−-- (5 / 2)

704−quot_

705− :: int `In` PGIntegral

706− => Expression outer grp commons schemas params from (nullity int)

707− -- ^ numerator

708− -> Expression outer grp commons schemas params from (nullity int)

709− -- ^ denominator

710− -> Expression outer grp commons schemas params from (nullity int)

711−quot_ = unsafeBinaryOp "/"

712−

713−-- | remainder upon integer division

714−--

715−-- >>> :{

716−-- let

717−-- expression :: Expression outer grp commons schemas params from (nullity 'PGint2)

718−-- expression = 5 `rem_` 2

719−-- in printSQL expression

720−-- :}

721−-- (5 % 2)

722−rem_

723− :: int `In` PGIntegral

724− => Expression outer grp commons schemas params from (nullity int)

725− -- ^ numerator

726− -> Expression outer grp commons schemas params from (nullity int)

727− -- ^ denominator

728− -> Expression outer grp commons schemas params from (nullity int)

729−rem_ = unsafeBinaryOp "%"

730−

731−-- | >>> :{

732−-- let

733−-- expression :: Expression outer grp commons schemas params from (nullity 'PGfloat4)

734−-- expression = trunc pi

735−-- in printSQL expression

736−-- :}

737−-- trunc(pi())

738−trunc

739− :: frac `In` PGFloating

740− => Expression outer grp commons schemas params from (nullity frac)

741− -- ^ fractional number

742− -> Expression outer grp commons schemas params from (nullity frac)

743−trunc = unsafeFunction "trunc"

744−

745−-- | >>> :{

746−-- let

747−-- expression :: Expression outer grp commons schemas params from (nullity 'PGfloat4)

748−-- expression = round_ pi

749−-- in printSQL expression

750−-- :}

751−-- round(pi())

752−round_

753− :: frac `In` PGFloating

754− => Expression outer grp commons schemas params from (nullity frac)

755− -- ^ fractional number

756− -> Expression outer grp commons schemas params from (nullity frac)

757−round_ = unsafeFunction "round"

758−

759−-- | >>> :{

760−-- let

761−-- expression :: Expression outer grp commons schemas params from (nullity 'PGfloat4)

762−-- expression = ceiling_ pi

763−-- in printSQL expression

764−-- :}

765−-- ceiling(pi())

766−ceiling_

767− :: frac `In` PGFloating

768− => Expression outer grp commons schemas params from (nullity frac)

769− -- ^ fractional number

770− -> Expression outer grp commons schemas params from (nullity frac)

771−ceiling_ = unsafeFunction "ceiling"

772−

773−-- | A `Condition` is an `Expression`, which can evaluate

774−-- to `true`, `false` or `null_`. This is because SQL uses

775−-- a three valued logic.

776−type Condition outer grp commons schemas params from =

777− Expression outer grp commons schemas params from ('Null 'PGbool)

778−

779−-- | >>> printSQL true

780−-- TRUE

781−true :: Expression outer grp commons schemas params from (nullity 'PGbool)

782−true = UnsafeExpression "TRUE"

783−

784−-- | >>> printSQL false

785−-- FALSE

786−false :: Expression outer grp commons schemas params from (nullity 'PGbool)

787−false = UnsafeExpression "FALSE"

788−

789−-- | >>> printSQL $ not_ true

790−-- (NOT TRUE)

791−not_

792− :: Expression outer grp commons schemas params from (nullity 'PGbool)

793− -> Expression outer grp commons schemas params from (nullity 'PGbool)

794−not_ = unsafeUnaryOp "NOT"

795−

796−-- | >>> printSQL $ true .&& false

797−-- (TRUE AND FALSE)

798−(.&&)

799− :: Expression outer grp commons schemas params from (nullity 'PGbool)

800− -> Expression outer grp commons schemas params from (nullity 'PGbool)

801− -> Expression outer grp commons schemas params from (nullity 'PGbool)

802−infixr 3 .&&

803−(.&&) = unsafeBinaryOp "AND"

804−

805−-- | >>> printSQL $ true .|| false

806−-- (TRUE OR FALSE)

807−(.||)

808− :: Expression outer grp commons schemas params from (nullity 'PGbool)

809− -> Expression outer grp commons schemas params from (nullity 'PGbool)

810− -> Expression outer grp commons schemas params from (nullity 'PGbool)

811−infixr 2 .||

812−(.||) = unsafeBinaryOp "OR"

813−

814−-- | >>> :{

815−-- let

816−-- expression :: Expression outer grp commons schemas params from (nullity 'PGint2)

817−-- expression = caseWhenThenElse [(true, 1), (false, 2)] 3

818−-- in printSQL expression

819−-- :}

820−-- CASE WHEN TRUE THEN 1 WHEN FALSE THEN 2 ELSE 3 END

821−caseWhenThenElse

822− :: [ ( Condition outer grp commons schemas params from

823− , Expression outer grp commons schemas params from ty

824− ) ]

825− -- ^ whens and thens

826− -> Expression outer grp commons schemas params from ty

827− -- ^ else

828− -> Expression outer grp commons schemas params from ty

829−caseWhenThenElse whenThens else_ = UnsafeExpression $ mconcat

830− [ "CASE"

831− , mconcat

832− [ mconcat

833− [ " WHEN ", renderSQL when_

834− , " THEN ", renderSQL then_

835− ]

836− | (when_,then_) <- whenThens

837− ]

838− , " ELSE ", renderSQL else_

839− , " END"

840− ]

841−

842−-- | >>> :{

843−-- let

844−-- expression :: Expression outer grp commons schemas params from (nullity 'PGint2)

845−-- expression = ifThenElse true 1 0

846−-- in printSQL expression

847−-- :}

848−-- CASE WHEN TRUE THEN 1 ELSE 0 END

849−ifThenElse

850− :: Condition outer grp commons schemas params from

851− -> Expression outer grp commons schemas params from ty -- ^ then

852− -> Expression outer grp commons schemas params from ty -- ^ else

853− -> Expression outer grp commons schemas params from ty

854−ifThenElse if_ then_ else_ = caseWhenThenElse [(if_,then_)] else_

855−

856−-- | Comparison operations like `.==`, `./=`, `.>`, `.>=`, `.<` and `.<=`

857−-- will produce @NULL@s if one of their arguments is @NULL@.

858−--

859−-- >>> printSQL $ true .== null_

860−-- (TRUE = NULL)

861−(.==)

862− :: Expression outer grp commons schemas params from (nullity0 ty) -- ^ lhs

863− -> Expression outer grp commons schemas params from (nullity1 ty) -- ^ rhs

864− -> Condition outer grp commons schemas params from

865−(.==) = unsafeBinaryOp "="

866−infix 4 .==

867−

868−-- | >>> printSQL $ true ./= null_

869−-- (TRUE <> NULL)

870−(./=)

871− :: Expression outer grp commons schemas params from (nullity0 ty) -- ^ lhs

872− -> Expression outer grp commons schemas params from (nullity1 ty) -- ^ rhs

873− -> Condition outer grp commons schemas params from

874−(./=) = unsafeBinaryOp "<>"

875−infix 4 ./=

876−

877−-- | >>> printSQL $ true .>= null_

878−-- (TRUE >= NULL)

879−(.>=)

880− :: Expression outer grp commons schemas params from (nullity0 ty) -- ^ lhs

881− -> Expression outer grp commons schemas params from (nullity1 ty) -- ^ rhs

882− -> Condition outer grp commons schemas params from

883−(.>=) = unsafeBinaryOp ">="

884−infix 4 .>=

885−

886−-- | >>> printSQL $ true .< null_

887−-- (TRUE < NULL)

888−(.<)

889− :: Expression outer grp commons schemas params from (nullity0 ty) -- ^ lhs

890− -> Expression outer grp commons schemas params from (nullity1 ty) -- ^ rhs

891− -> Condition outer grp commons schemas params from

892−(.<) = unsafeBinaryOp "<"

893−infix 4 .<

894−

895−-- | >>> printSQL $ true .<= null_

896−-- (TRUE <= NULL)

897−(.<=)

898− :: Expression outer grp commons schemas params from (nullity0 ty) -- ^ lhs

899− -> Expression outer grp commons schemas params from (nullity1 ty) -- ^ rhs

900− -> Condition outer grp commons schemas params from

901−(.<=) = unsafeBinaryOp "<="

902−infix 4 .<=

903−

904−-- | >>> printSQL $ true .> null_

905−-- (TRUE > NULL)

906−(.>)

907− :: Expression outer grp commons schemas params from (nullity0 ty) -- ^ lhs

908− -> Expression outer grp commons schemas params from (nullity1 ty) -- ^ rhs

909− -> Condition outer grp commons schemas params from

910−(.>) = unsafeBinaryOp ">"

911−infix 4 .>

912−

913−-- | >>> printSQL currentDate

914−-- CURRENT_DATE

915−currentDate

916− :: Expression outer grp commons schemas params from (nullity 'PGdate)

917−currentDate = UnsafeExpression "CURRENT_DATE"

918−

919−-- | >>> printSQL currentTime

920−-- CURRENT_TIME

921−currentTime

922− :: Expression outer grp commons schemas params from (nullity 'PGtimetz)

923−currentTime = UnsafeExpression "CURRENT_TIME"

924−

925−-- | >>> printSQL currentTimestamp

926−-- CURRENT_TIMESTAMP

927−currentTimestamp

928− :: Expression outer grp commons schemas params from (nullity 'PGtimestamptz)

929−currentTimestamp = UnsafeExpression "CURRENT_TIMESTAMP"

930−

931−-- | >>> printSQL localTime

932−-- LOCALTIME

933−localTime

934− :: Expression outer grp commons schemas params from (nullity 'PGtime)

935−localTime = UnsafeExpression "LOCALTIME"

936−

937−-- | >>> printSQL localTimestamp

938−-- LOCALTIMESTAMP

939−localTimestamp

940− :: Expression outer grp commons schemas params from (nullity 'PGtimestamp)

941−localTimestamp = UnsafeExpression "LOCALTIMESTAMP"

942−

943−{-----------------------------------------

944−text

945−-----------------------------------------}

946

438

947instance IsString

439instance IsString

948− (Expression outer grp commons schemas params from (nullity 'PGtext)) where

440+ (Expression outer commons grp schemas params from (null 'PGtext)) where

949 fromString str = UnsafeExpression $

441 fromString str = UnsafeExpression $

950 "E\'" <> fromString (escape =<< str) <> "\'"

442 "E\'" <> fromString (escape =<< str) <> "\'"

951− where

443+instance IsString

952− escape = \case

444+ (Expression outer commons grp schemas params from (null 'PGtsvector)) where

953− '\NUL' -> "\\0"

445+ fromString str = UnsafeExpression . parenthesized . (<> " :: tsvector") $

954− '\'' -> "''"

446+ "E\'" <> fromString (escape =<< str) <> "\'"

955− '"' -> "\\\""

447+instance IsString

956− '\b' -> "\\b"

448+ (Expression outer commons grp schemas params from (null 'PGtsquery)) where

957− '\n' -> "\\n"

449+ fromString str = UnsafeExpression . parenthesized . (<> " :: tsquery") $

958− '\r' -> "\\r"

450+ "E\'" <> fromString (escape =<< str) <> "\'"

959− '\t' -> "\\t"

960− '\\' -> "\\\\"

961− c -> [c]

962

451

963instance Semigroup

452instance 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

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

458+instance Semigroup

964− (Expression outer grp commons schemas params from (nullity 'PGtext)) where

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

965 (<>) = unsafeBinaryOp "||"

463 (<>) = unsafeBinaryOp "||"

966

464

967instance Monoid

465instance Monoid

968− (Expression outer grp commons schemas params from (nullity 'PGtext)) where

466+ (Expression outer commons grp schemas params from (null 'PGtext)) where

467+ mempty = fromString ""

468+ mappend = (<>)

469+instance Monoid

470+ (Expression outer commons grp schemas params from (null 'PGtsvector)) where

969 mempty = fromString ""

471 mempty = fromString ""

970 mappend = (<>)

472 mappend = (<>)

971−

972−-- | >>> printSQL $ lower "ARRRGGG"

973−-- lower(E'ARRRGGG')

974−lower

975− :: Expression outer grp commons schemas params from (nullity 'PGtext)

976− -- ^ string to lower case

977− -> Expression outer grp commons schemas params from (nullity 'PGtext)

978−lower = unsafeFunction "lower"

979−

980−-- | >>> printSQL $ upper "eeee"

981−-- upper(E'eeee')

982−upper

983− :: Expression outer grp commons schemas params from (nullity 'PGtext)

984− -- ^ string to upper case

985− -> Expression outer grp commons schemas params from (nullity 'PGtext)

986−upper = unsafeFunction "upper"

987−

988−-- | >>> printSQL $ charLength "four"

989−-- char_length(E'four')

990−charLength

991− :: Expression outer grp commons schemas params from (nullity 'PGtext)

992− -- ^ string to measure

993− -> Expression outer grp commons schemas params from (nullity 'PGint4)

994−charLength = unsafeFunction "char_length"

995−

996−-- | The `like` expression returns true if the @string@ matches

997−-- the supplied @pattern@. If @pattern@ does not contain percent signs

998−-- or underscores, then the pattern only represents the string itself;

999−-- in that case `like` acts like the equals operator. An underscore (_)

1000−-- in pattern stands for (matches) any single character; a percent sign (%)

1001−-- matches any sequence of zero or more characters.

1002−--

1003−-- >>> printSQL $ "abc" `like` "a%"

1004−-- (E'abc' LIKE E'a%')

1005−like

1006− :: Expression outer grp commons schemas params from (nullity 'PGtext)

1007− -- ^ string

1008− -> Expression outer grp commons schemas params from (nullity 'PGtext)

1009− -- ^ pattern

1010− -> Expression outer grp commons schemas params from (nullity 'PGbool)

1011−like = unsafeBinaryOp "LIKE"

1012−

1013−-- | The key word ILIKE can be used instead of LIKE to make the

1014−-- match case-insensitive according to the active locale.

1015−--

1016−-- >>> printSQL $ "abc" `ilike` "a%"

1017−-- (E'abc' ILIKE E'a%')

1018−ilike

1019− :: Expression outer grp commons schemas params from (nullity 'PGtext)

1020− -- ^ string

1021− -> Expression outer grp commons schemas params from (nullity 'PGtext)

1022− -- ^ pattern

1023− -> Expression outer grp commons schemas params from (nullity 'PGbool)

1024−ilike = unsafeBinaryOp "ILIKE"

1025−

1026−{-----------------------------------------

1027− -- json and jsonb support

1028−

1029−See https://www.postgresql.org/docs/10/static/functions-json.html -- most

1030−comments lifted directly from this page.

1031−

1032−Table 9.44: json and jsonb operators

1033−-----------------------------------------}

1034−

1035−-- | Get JSON value (object field or array element) at a key.

1036−(.->)

1037− :: (json `In` PGJsonType, key `In` PGJsonKey)

1038− => Expression outer grp commons schemas params from (nullity json)

1039− -> Expression outer grp commons schemas params from (nullity key)

1040− -> Expression outer grp commons schemas params from ('Null json)

1041−infixl 8 .->

1042−(.->) = unsafeBinaryOp "->"

1043−

1044−-- | Get JSON value (object field or array element) at a key, as text.

1045−(.->>)

1046− :: (json `In` PGJsonType, key `In` PGJsonKey)

1047− => Expression outer grp commons schemas params from (nullity json)

1048− -> Expression outer grp commons schemas params from (nullity key)

1049− -> Expression outer grp commons schemas params from ('Null 'PGtext)

1050−infixl 8 .->>

1051−(.->>) = unsafeBinaryOp "->>"

1052−

1053−-- | Get JSON value at a specified path.

1054−(.#>)

1055− :: (json `In` PGJsonType, PGTextArray "(.#>)" path)

1056− => Expression outer grp commons schemas params from (nullity json)

1057− -> Expression outer grp commons schemas params from (nullity path)

1058− -> Expression outer grp commons schemas params from ('Null json)

1059−infixl 8 .#>

1060−(.#>) = unsafeBinaryOp "#>"

1061−

1062−-- | Get JSON value at a specified path as text.

1063−(.#>>)

1064− :: (json `In` PGJsonType, PGTextArray "(.#>>)" path)

1065− => Expression outer grp commons schemas params from (nullity json)

1066− -> Expression outer grp commons schemas params from (nullity path)

1067− -> Expression outer grp commons schemas params from ('Null 'PGtext)

1068−infixl 8 .#>>

1069−(.#>>) = unsafeBinaryOp "#>>"

1070−

1071−-- Additional jsonb operators

1072−

1073−-- | Does the left JSON value contain the right JSON path/value entries at the

1074−-- top level?

1075−(.@>)

1076− :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1077− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1078− -> Condition outer grp commons schemas params from

1079−infixl 9 .@>

1080−(.@>) = unsafeBinaryOp "@>"

1081−

1082−-- | Are the left JSON path/value entries contained at the top level within the

1083−-- right JSON value?

1084−(.<@)

1085− :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1086− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1087− -> Condition outer grp commons schemas params from

1088−infixl 9 .<@

1089−(.<@) = unsafeBinaryOp "<@"

1090−

1091−-- | Does the string exist as a top-level key within the JSON value?

1092−(.?)

1093− :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1094− -> Expression outer grp commons schemas params from (nullity 'PGtext)

1095− -> Condition outer grp commons schemas params from

1096−infixl 9 .?

1097−(.?) = unsafeBinaryOp "?"

1098−

1099−-- | Do any of these array strings exist as top-level keys?

1100−(.?|)

1101− :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1102− -> Expression outer grp commons schemas params from (nullity ('PGvararray ('NotNull 'PGtext)))

1103− -> Condition outer grp commons schemas params from

1104−infixl 9 .?|

1105−(.?|) = unsafeBinaryOp "?|"

1106−

1107−-- | Do all of these array strings exist as top-level keys?

1108−(.?&)

1109− :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1110− -> Expression outer grp commons schemas params from (nullity ('PGvararray ('NotNull 'PGtext)))

1111− -> Condition outer grp commons schemas params from

1112−infixl 9 .?&

1113−(.?&) = unsafeBinaryOp "?&"

1114−

1115−-- | Concatenate two jsonb values into a new jsonb value.

1116−instance Semigroup

1117− (Expression outer grp commons schemas params from (nullity 'PGjsonb)) where

1118− (<>) = unsafeBinaryOp "||"

1119−

1120−-- | Delete a key or keys from a JSON object, or remove an array element.

1121−--

1122−-- If the right operand is..

1123−--

1124−-- @ text @: Delete key/value pair or string element from left operand. Key/value pairs

1125−-- are matched based on their key value.

1126−--

1127−-- @ text[] @: Delete multiple key/value pairs or string elements

1128−-- from left operand. Key/value pairs are matched based on their key value.

1129−--

1130−-- @ integer @: Delete the array element with specified index (Negative integers

1131−-- count from the end). Throws an error if top level container is not an array.

1132−(.-.)

1133− :: (key `In` '[ 'PGtext, 'PGvararray ('NotNull 'PGtext), 'PGint4, 'PGint2 ]) -- hlint error without parens here

1134− => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1135− -> Expression outer grp commons schemas params from (nullity key)

1136− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1137−infixl 6 .-.

1138−(.-.) = unsafeBinaryOp "-"

1139−

1140−-- | Delete the field or element with specified path (for JSON arrays, negative

1141−-- integers count from the end)

1142−(#-.)

1143− :: PGTextArray "(#-.)" arrayty

1144− => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1145− -> Expression outer grp commons schemas params from (nullity arrayty)

1146− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1147−infixl 6 #-.

1148−(#-.) = unsafeBinaryOp "#-"

1149−

1150−{-----------------------------------------

1151−Table 9.45: JSON creation functions

1152−-----------------------------------------}

1153−

1154−-- | Literal binary JSON

1155−jsonbLit

1156− :: JSON.ToJSON x

1157− => x -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1158−jsonbLit = cast jsonb . UnsafeExpression

1159− . singleQuotedUtf8 . toStrict . JSON.encode

1160−

1161−-- | Literal JSON

1162−jsonLit

1163− :: JSON.ToJSON x

1164− => x -> Expression outer grp commons schemas params from (nullity 'PGjson)

1165−jsonLit = cast json . UnsafeExpression

1166− . singleQuotedUtf8 . toStrict . JSON.encode

1167−

1168−-- | Returns the value as json. Arrays and composites are converted

1169−-- (recursively) to arrays and objects; otherwise, if there is a cast from the

1170−-- type to json, the cast function will be used to perform the conversion;

1171−-- otherwise, a scalar value is produced. For any scalar type other than a

1172−-- number, a Boolean, or a null value, the text representation will be used, in

1173−-- such a fashion that it is a valid json value.

1174−toJson

1175− :: Expression outer grp commons schemas params from (nullity ty)

1176− -> Expression outer grp commons schemas params from (nullity 'PGjson)

1177−toJson = unsafeFunction "to_json"

1178−

1179−-- | Returns the value as jsonb. Arrays and composites are converted

1180−-- (recursively) to arrays and objects; otherwise, if there is a cast from the

1181−-- type to json, the cast function will be used to perform the conversion;

1182−-- otherwise, a scalar value is produced. For any scalar type other than a

1183−-- number, a Boolean, or a null value, the text representation will be used, in

1184−-- such a fashion that it is a valid jsonb value.

1185−toJsonb

1186− :: Expression outer grp commons schemas params from (nullity ty)

1187− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1188−toJsonb = unsafeFunction "to_jsonb"

1189−

1190−-- | Returns the array as a JSON array. A PostgreSQL multidimensional array

1191−-- becomes a JSON array of arrays.

1192−arrayToJson

1193− :: PGArray "arrayToJson" arr

1194− => Expression outer grp commons schemas params from (nullity arr)

1195− -> Expression outer grp commons schemas params from (nullity 'PGjson)

1196−arrayToJson = unsafeFunction "array_to_json"

1197−

1198−-- | Returns the row as a JSON object.

1199−rowToJson

1200− :: Expression outer grp commons schemas params from (nullity ('PGcomposite ty))

1201− -> Expression outer grp commons schemas params from (nullity 'PGjson)

1202−rowToJson = unsafeFunction "row_to_json"

1203−

1204−-- | Builds a possibly-heterogeneously-typed JSON array out of a variadic

1205−-- argument list.

1206−jsonBuildArray

1207− :: SListI elems

1208− => NP (Expression outer grp commons schemas params from) elems

1209− -> Expression outer grp commons schemas params from (nullity 'PGjson)

1210−jsonBuildArray = unsafeVariadicFunction "json_build_array"

1211−

1212−-- | Builds a possibly-heterogeneously-typed (binary) JSON array out of a

1213−-- variadic argument list.

1214−jsonbBuildArray

1215− :: SListI elems

1216− => NP (Expression outer grp commons schemas params from) elems

1217− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1218−jsonbBuildArray = unsafeVariadicFunction "jsonb_build_array"

1219−

1220−unsafeRowFunction

1221− :: SOP.SListI elems

1222− => NP (Aliased (Expression outer grp commons schemas params from)) elems

1223− -> [ByteString]

1224−unsafeRowFunction =

1225− (`appEndo` []) . hcfoldMap (Proxy :: SOP.Proxy SOP.Top)

1226− (\(col `As` name) -> Endo $ \xs ->

1227− renderAliasString name : renderSQL col : xs)

1228− where

1229− renderAliasString :: KnownSymbol alias => Alias alias -> ByteString

1230− renderAliasString = singleQuotedText . fromString . symbolVal

1231−

1232−-- | Builds a possibly-heterogeneously-typed JSON object out of a variadic

1233−-- argument list. The elements of the argument list must alternate between text

1234−-- and values.

1235−jsonBuildObject

1236− :: SOP.SListI elems

1237− => NP (Aliased (Expression outer grp commons schemas params from)) elems

1238− -> Expression outer grp commons schemas params from (nullity 'PGjson)

1239−jsonBuildObject

1240− = unsafeFunction "json_build_object"

1241− . UnsafeExpression

1242− . commaSeparated

1243− . unsafeRowFunction

1244−

1245−-- | Builds a possibly-heterogeneously-typed (binary) JSON object out of a

1246−-- variadic argument list. The elements of the argument list must alternate

1247−-- between text and values.

1248−jsonbBuildObject

1249− :: SOP.SListI elems

1250− => NP (Aliased (Expression outer grp commons schemas params from)) elems

1251− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1252−jsonbBuildObject

1253− = unsafeFunction "jsonb_build_object"

1254− . UnsafeExpression

1255− . commaSeparated

1256− . unsafeRowFunction

1257−

1258−-- | Builds a JSON object out of a text array. The array must have either

1259−-- exactly one dimension with an even number of members, in which case they are

1260−-- taken as alternating key/value pairs, or two dimensions such that each inner

1261−-- array has exactly two elements, which are taken as a key/value pair.

1262−jsonObject

1263− :: PGArrayOf "jsonObject" arr ('NotNull 'PGtext)

1264− => Expression outer grp commons schemas params from (nullity arr)

1265− -> Expression outer grp commons schemas params from (nullity 'PGjson)

1266−jsonObject = unsafeFunction "json_object"

1267−

1268−-- | Builds a binary JSON object out of a text array. The array must have either

1269−-- exactly one dimension with an even number of members, in which case they are

1270−-- taken as alternating key/value pairs, or two dimensions such that each inner

1271−-- array has exactly two elements, which are taken as a key/value pair.

1272−jsonbObject

1273− :: PGArrayOf "jsonbObject" arr ('NotNull 'PGtext)

1274− => Expression outer grp commons schemas params from (nullity arr)

1275− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1276−jsonbObject = unsafeFunction "jsonb_object"

1277−

1278−-- | This is an alternate form of 'jsonObject' that takes two arrays; one for

1279−-- keys and one for values, that are zipped pairwise to create a JSON object.

1280−jsonZipObject

1281− :: ( PGArrayOf "jsonZipObject" keysArray ('NotNull 'PGtext)

1282− , PGArrayOf "jsonZipObject" valuesArray ('NotNull 'PGtext))

1283− => Expression outer grp commons schemas params from (nullity keysArray)

1284− -> Expression outer grp commons schemas params from (nullity valuesArray)

1285− -> Expression outer grp commons schemas params from (nullity 'PGjson)

1286−jsonZipObject ks vs =

1287− unsafeVariadicFunction "json_object" (ks :* vs :* Nil)

1288−

1289−-- | This is an alternate form of 'jsonObject' that takes two arrays; one for

1290−-- keys and one for values, that are zipped pairwise to create a binary JSON

1291−-- object.

1292−jsonbZipObject

1293− :: ( PGArrayOf "jsonbZipObject" keysArray ('NotNull 'PGtext)

1294− , PGArrayOf "jsonbZipObject" valuesArray ('NotNull 'PGtext))

1295− => Expression outer grp commons schemas params from (nullity keysArray)

1296− -> Expression outer grp commons schemas params from (nullity valuesArray)

1297− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1298−jsonbZipObject ks vs =

1299− unsafeVariadicFunction "jsonb_object" (ks :* vs :* Nil)

1300−

1301−{-----------------------------------------

1302−Table 9.46: JSON processing functions

1303−-----------------------------------------}

1304−

1305−-- | Returns the number of elements in the outermost JSON array.

1306−jsonArrayLength

1307− :: Expression outer grp commons schemas params from (nullity 'PGjson)

1308− -> Expression outer grp commons schemas params from (nullity 'PGint4)

1309−jsonArrayLength = unsafeFunction "json_array_length"

1310−

1311−-- | Returns the number of elements in the outermost binary JSON array.

1312−jsonbArrayLength

1313− :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1314− -> Expression outer grp commons schemas params from (nullity 'PGint4)

1315−jsonbArrayLength = unsafeFunction "jsonb_array_length"

1316−

1317−-- | Returns JSON value pointed to by the given path (equivalent to #>

1318−-- operator).

1319−jsonExtractPath

1320− :: SListI elems

1321− => Expression outer grp commons schemas params from (nullity 'PGjson)

1322− -> NP (Expression outer grp commons schemas params from) elems

1323− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1324−jsonExtractPath x xs =

1325− unsafeVariadicFunction "json_extract_path" (x :* xs)

1326−

1327−-- | Returns JSON value pointed to by the given path (equivalent to #>

1328−-- operator).

1329−jsonbExtractPath

1330− :: SListI elems

1331− => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1332− -> NP (Expression outer grp commons schemas params from) elems

1333− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1334−jsonbExtractPath x xs =

1335− unsafeVariadicFunction "jsonb_extract_path" (x :* xs)

1336−

1337−-- | Returns JSON value pointed to by the given path (equivalent to #>

1338−-- operator), as text.

1339−jsonExtractPathAsText

1340− :: SListI elems

1341− => Expression outer grp commons schemas params from (nullity 'PGjson)

1342− -> NP (Expression outer grp commons schemas params from) elems

1343− -> Expression outer grp commons schemas params from (nullity 'PGjson)

1344−jsonExtractPathAsText x xs =

1345− unsafeVariadicFunction "json_extract_path_text" (x :* xs)

1346−

1347−-- | Returns JSON value pointed to by the given path (equivalent to #>

1348−-- operator), as text.

1349−jsonbExtractPathAsText

1350− :: SListI elems

1351− => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1352− -> NP (Expression outer grp commons schemas params from) elems

1353− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1354−jsonbExtractPathAsText x xs =

1355− unsafeVariadicFunction "jsonb_extract_path_text" (x :* xs)

1356−

1357−-- | Returns the type of the outermost JSON value as a text string. Possible

1358−-- types are object, array, string, number, boolean, and null.

1359−jsonTypeof

1360− :: Expression outer grp commons schemas params from (nullity 'PGjson)

1361− -> Expression outer grp commons schemas params from (nullity 'PGtext)

1362−jsonTypeof = unsafeFunction "json_typeof"

1363−

1364−-- | Returns the type of the outermost binary JSON value as a text string.

1365−-- Possible types are object, array, string, number, boolean, and null.

1366−jsonbTypeof

1367− :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1368− -> Expression outer grp commons schemas params from (nullity 'PGtext)

1369−jsonbTypeof = unsafeFunction "jsonb_typeof"

1370−

1371−-- | Returns its argument with all object fields that have null values omitted.

1372−-- Other null values are untouched.

1373−jsonStripNulls

1374− :: Expression outer grp commons schemas params from (nullity 'PGjson)

1375− -> Expression outer grp commons schemas params from (nullity 'PGjson)

1376−jsonStripNulls = unsafeFunction "json_strip_nulls"

1377−

1378−-- | Returns its argument with all object fields that have null values omitted.

1379−-- Other null values are untouched.

1380−jsonbStripNulls

1381− :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1382− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1383−jsonbStripNulls = unsafeFunction "jsonb_strip_nulls"

1384−

1385−-- | @ jsonbSet target path new_value create_missing @

1386−--

1387−-- Returns target with the section designated by path replaced by new_value,

1388−-- or with new_value added if create_missing is true ( default is true) and the

1389−-- item designated by path does not exist. As with the path orientated

1390−-- operators, negative integers that appear in path count from the end of JSON

1391−-- arrays.

1392−jsonbSet

1393− :: PGTextArray "jsonbSet" arr

1394− => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1395− -> Expression outer grp commons schemas params from (nullity arr)

1396− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1397− -> Maybe (Expression outer grp commons schemas params from (nullity 'PGbool))

1398− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1399−jsonbSet tgt path val createMissing = case createMissing of

1400− Just m -> unsafeVariadicFunction "jsonb_set" (tgt :* path :* val :* m :* Nil)

1401− Nothing -> unsafeVariadicFunction "jsonb_set" (tgt :* path :* val :* Nil)

1402−

1403−-- | @ jsonbInsert target path new_value insert_after @

1404−--

1405−-- Returns target with new_value inserted. If target section designated by

1406−-- path is in a JSONB array, new_value will be inserted before target or after

1407−-- if insert_after is true (default is false). If target section designated by

1408−-- path is in JSONB object, new_value will be inserted only if target does not

1409−-- exist. As with the path orientated operators, negative integers that appear

1410−-- in path count from the end of JSON arrays.

1411−jsonbInsert

1412− :: PGTextArray "jsonbInsert" arr

1413− => Expression outer grp commons schemas params from (nullity 'PGjsonb)

1414− -> Expression outer grp commons schemas params from (nullity arr)

1415− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1416− -> Maybe (Expression outer grp commons schemas params from (nullity 'PGbool))

1417− -> Expression outer grp commons schemas params from (nullity 'PGjsonb)

1418−jsonbInsert tgt path val insertAfter = case insertAfter of

1419− Just i -> unsafeVariadicFunction "jsonb_insert" (tgt :* path :* val :* i :* Nil)

1420− Nothing -> unsafeVariadicFunction "jsonb_insert" (tgt :* path :* val :* Nil)

1421−

1422−-- | Returns its argument as indented JSON text.

1423−jsonbPretty

1424− :: Expression outer grp commons schemas params from (nullity 'PGjsonb)

1425− -> Expression outer grp commons schemas params from (nullity 'PGtext)

1426−jsonbPretty = unsafeFunction "jsonb_pretty"

1427−

1428−{-----------------------------------------

1429−aggregation

1430−-----------------------------------------}

1431−

1432−{- |

1433−`Aggregate` functions compute a single result from a set of input values.

1434−`Aggregate` functions can be used as `GroupedBy` `Expression`s as well

1435−as `WindowFunction`s.

1436−-}

1437−class Aggregate expr1 expr2 aggr

1438− | aggr -> expr1, aggr -> expr2 where

1439−

1440− -- | A special aggregation that does not require an input

1441− --

1442− -- >>> :{

1443− -- let

1444− -- expression :: Expression '[] ('Grouped bys) commons schemas params from ('NotNull 'PGint8)

1445− -- expression = countStar

1446− -- in printSQL expression

1447− -- :}

1448− -- count(*)

1449− countStar :: aggr ('NotNull 'PGint8)

1450−

1451− -- | >>> :{

1452− -- let

1453− -- expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: nullity ty]] ('NotNull 'PGint8)

1454− -- expression = count (All #col)

1455− -- in printSQL expression

1456− -- :}

1457− -- count(ALL "col")

1458− count

1459− :: expr1 ty

1460− -- ^ what to count

1461− -> aggr ('NotNull 'PGint8)

1462−

1463− -- | >>> :{

1464− -- let

1465− -- expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: 'Null 'PGnumeric]] ('NotNull 'PGnumeric)

1466− -- expression = sum_ (Distinct #col)

1467− -- in printSQL expression

1468− -- :}

1469− -- sum(DISTINCT "col")

1470− sum_

1471− :: ty `In` PGNum

1472− => expr1 (nullity ty)

1473− -> aggr ('NotNull ty)

1474−

1475− -- | input values, including nulls, concatenated into an array

1476− arrayAgg

1477− :: expr1 ty

1478− -> aggr ('Null ('PGvararray ty))

1479−

1480− -- | aggregates values as a JSON array

1481− jsonAgg

1482− :: expr1 ty

1483− -> aggr ('Null 'PGjson)

1484−

1485− -- | aggregates values as a JSON array

1486− jsonbAgg

1487− :: expr1 ty

1488− -> aggr ('Null 'PGjsonb)

1489−

1490− {- |

1491− the bitwise AND of all non-null input values, or null if none

1492− >>> :{

1493− let

1494− expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: nullity 'PGint4]] ('Null 'PGint4)

1495− expression = bitAnd (Distinct #col)

1496− in printSQL expression

1497− :}

1498− bit_and(DISTINCT "col")

1499− -}

1500− bitAnd

1501− :: int `In` PGIntegral

1502− => expr1 (nullity int)

1503− -- ^ what to aggregate

1504− -> aggr ('Null int)

1505−

1506− {- |

1507− the bitwise OR of all non-null input values, or null if none

1508−

1509− >>> :{

1510− let

1511− expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: nullity 'PGint4]] ('Null 'PGint4)

1512− expression = bitOr (All #col)

1513− in printSQL expression

1514− :}

1515− bit_or(ALL "col")

1516− -}

1517− bitOr

1518− :: int `In` PGIntegral

1519− => expr1 (nullity int)

1520− -- ^ what to aggregate

1521− -> aggr ('Null int)

1522−

1523− {- |

1524− true if all input values are true, otherwise false

1525−

1526− >>> :{

1527− let

1528− winFun :: WindowFunction '[] 'Ungrouped commons schemas params '[tab ::: '["col" ::: nullity 'PGbool]] ('Null 'PGbool)

1529− winFun = boolAnd #col

1530− in printSQL winFun

1531− :}

1532− bool_and("col")

1533− -}

1534− boolAnd

1535− :: expr1 (nullity 'PGbool)

1536− -- ^ what to aggregate

1537− -> aggr ('Null 'PGbool)

1538−

1539− {- |

1540− true if at least one input value is true, otherwise false

1541−

1542− >>> :{

1543− let

1544− expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: nullity 'PGbool]] ('Null 'PGbool)

1545− expression = boolOr (All #col)

1546− in printSQL expression

1547− :}

1548− bool_or(ALL "col")

1549− -}

1550− boolOr

1551− :: expr1(nullity 'PGbool)

1552− -- ^ what to aggregate

1553− -> aggr ('Null 'PGbool)

1554−

1555− {- |

1556− equivalent to `boolAnd`

1557−

1558− >>> :{

1559− let

1560− expression :: Expression '[] ('Grouped bys) commons schemas params '[tab ::: '["col" ::: nullity 'PGbool]] ('Null 'PGbool)

1561− expression = every (Distinct #col)

1562− in printSQL expression

1563− :}

1564− every(DISTINCT "col")

1565− -}

1566− every

1567− :: expr1 (nullity 'PGbool)

1568− -- ^ what to aggregate

1569− -> aggr ('Null 'PGbool)

1570−

1571− {- |maximum value of expression across all input values-}

1572− max_

1573− :: expr1 (nullity ty)

1574− -- ^ what to maximize

1575− -> aggr ('Null ty)

1576−

1577− -- | minimum value of expression across all input values

1578− min_

1579− :: expr1 (nullity ty)

1580− -- ^ what to minimize

1581− -> aggr ('Null ty)

1582−

1583− -- | the average (arithmetic mean) of all input values

1584− avg

1585− :: expr1 (nullity ty)

1586− -- ^ what to average

1587− -> aggr ('Null (PGAvg ty))

1588−

1589− {- | correlation coefficient

1590− >>> :{

1591− let

1592− expression :: Expression '[] ('Grouped g) c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1593− expression = corr (All (#y :*: #x))

1594− in printSQL expression

1595− :}

1596− corr(ALL "y", "x")

1597− -}

1598− corr

1599− :: expr2 (nullity 'PGfloat8)

1600− -> aggr ('Null 'PGfloat8)

1601−

1602− {- | population covariance

1603− >>> :{

1604− let

1605− expression :: Expression '[] ('Grouped g) c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1606− expression = covarPop (All (#y :*: #x))

1607− in printSQL expression

1608− :}

1609− covar_pop(ALL "y", "x")

1610− -}

1611− covarPop

1612− :: expr2 (nullity 'PGfloat8)

1613− -> aggr ('Null 'PGfloat8)

1614−

1615− {- | sample covariance

1616− >>> :{

1617− let

1618− winFun :: WindowFunction '[] 'Ungrouped c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1619− winFun = covarSamp (#y :*: #x)

1620− in printSQL winFun

1621− :}

1622− covar_samp("y", "x")

1623− -}

1624− covarSamp

1625− :: expr2 (nullity 'PGfloat8)

1626− -> aggr ('Null 'PGfloat8)

1627−

1628− {- | average of the independent variable (sum(X)/N)

1629− >>> :{

1630− let

1631− expression :: Expression '[] ('Grouped g) c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1632− expression = regrAvgX (All (#y :*: #x))

1633− in printSQL expression

1634− :}

1635− regr_avgx(ALL "y", "x")

1636− -}

1637− regrAvgX

1638− :: expr2 (nullity 'PGfloat8)

1639− -> aggr ('Null 'PGfloat8)

1640−

1641− {- | average of the dependent variable (sum(Y)/N)

1642− >>> :{

1643− let

1644− winFun :: WindowFunction '[] 'Ungrouped c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1645− winFun = regrAvgY (#y :*: #x)

1646− in printSQL winFun

1647− :}

1648− regr_avgy("y", "x")

1649− -}

1650− regrAvgY

1651− :: expr2 (nullity 'PGfloat8)

1652− -> aggr ('Null 'PGfloat8)

1653−

1654− {- | number of input rows in which both expressions are nonnull

1655− >>> :{

1656− let

1657− winFun :: WindowFunction '[] 'Ungrouped c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGint8)

1658− winFun = regrCount (#y :*: #x)

1659− in printSQL winFun

1660− :}

1661− regr_count("y", "x")

1662− -}

1663− regrCount

1664− :: expr2 (nullity 'PGfloat8)

1665− -> aggr ('Null 'PGint8)

1666−

1667− {- | y-intercept of the least-squares-fit linear equation determined by the (X, Y) pairs

1668− >>> :{

1669− let

1670− expression :: Expression '[] ('Grouped g) c s p '[t ::: '["x" ::: 'NotNull 'PGfloat8, "y" ::: 'NotNull 'PGfloat8]] ('Null 'PGfloat8)

1671− expression = regrIntercept (All (#y :*: #x))

1672− in printSQL expression

1673− :}

1674− regr_intercept(ALL "y", "x")

1675− -}

1676− regrIntercept

1677− :: expr2 (nullity 'PGfloat8)

1678− -> aggr ('Null 'PGfloat8)

1679−

1680− -- | @regr_r2(Y, X)@, square of the correlation coefficient

1681− regrR2

1682− :: expr2 (nullity 'PGfloat8)

1683− -> aggr ('Null 'PGfloat8)

1684−

1685− -- | @regr_slope(Y, X)@, slope of the least-squares-fit linear equation

1686− -- determined by the (X, Y) pairs

1687− regrSlope

1688− :: expr2 (nullity 'PGfloat8)

1689− -> aggr ('Null 'PGfloat8)

1690−

1691− -- | @regr_sxx(Y, X)@, sum(X^2) - sum(X)^2/N

1692− -- (“sum of squares” of the independent variable)

1693− regrSxx

1694− :: expr2 (nullity 'PGfloat8)

1695− -> aggr ('Null 'PGfloat8)

1696−

1697− -- | @regr_sxy(Y, X)@, sum(X*Y) - sum(X) * sum(Y)/N

1698− -- (“sum of products” of independent times dependent variable)

1699− regrSxy

1700− :: expr2 (nullity 'PGfloat8)

1701− -> aggr ('Null 'PGfloat8)

1702−

1703− -- | @regr_syy(Y, X)@, sum(Y^2) - sum(Y)^2/N

1704− -- (“sum of squares” of the dependent variable)

1705− regrSyy

1706− :: expr2 (nullity 'PGfloat8)

1707− -> aggr ('Null 'PGfloat8)

1708−

1709− -- | historical alias for `stddevSamp`

1710− stddev

1711− :: expr1 (nullity ty)

1712− -> aggr ('Null (PGAvg ty))

1713−

1714− -- | population standard deviation of the input values

1715− stddevPop

1716− :: expr1 (nullity ty)

1717− -> aggr ('Null (PGAvg ty))

1718−

1719− -- | sample standard deviation of the input values

1720− stddevSamp

1721− :: expr1 (nullity ty)

1722− -> aggr ('Null (PGAvg ty))

1723−

1724− -- | historical alias for `varSamp`

1725− variance

1726− :: expr1 (nullity ty)

1727− -> aggr ('Null (PGAvg ty))

1728−

1729− -- | population variance of the input values

1730− -- (square of the population standard deviation)

1731− varPop

1732− :: expr1 (nullity ty)

1733− -> aggr ('Null (PGAvg ty))

1734−

1735− -- | sample variance of the input values

1736− -- (square of the sample standard deviation)

1737− varSamp

1738− :: expr1 (nullity ty)

1739− -> aggr ('Null (PGAvg ty))

1740−

1741−{- |

1742−`Distinction`s are used for the input of `Aggregate` `Expression`s.

1743−`All` invokes the aggregate once for each input row.

1744−`Distinct` invokes the aggregate once for each distinct value of the expression

1745−(or distinct set of values, for multiple expressions) found in the input

1746−-}

1747−data Distinction expr ty

1748− = All (expr ty)

1749− | Distinct (expr ty)

1750− deriving (GHC.Generic,Show,Eq,Ord)

1751−instance NFData (Distinction (Expression outer grp commons schemas params from) ty)

1752−instance RenderSQL (Distinction (Expression outer grp commons schemas params from) ty) where

1753− renderSQL = \case

1754− All x -> "ALL" <+> renderSQL x

1755− Distinct x -> "DISTINCT" <+> renderSQL x

1756−instance RenderSQL

1757− (Distinction

1758− ( Expression outer grp commons schemas params from

1759− :*:

1760− Expression outer grp commons schemas params from) xty ) where

1761− renderSQL = \case

1762− All (x :*: x') ->

1763− "ALL" <+> renderSQL x <> ", " <> renderSQL x'

1764− Distinct (x :*: x') ->

1765− "DISTINCT" <+> renderSQL x <> ", " <> renderSQL x'

1766−

1767−instance Aggregate

1768− (Distinction (Expression outer 'Ungrouped commons schemas params from))

1769− (Distinction (Expression outer 'Ungrouped commons schemas params from :*: Expression outer 'Ungrouped commons schemas params from))

1770− (Expression outer ('Grouped bys) commons schemas params from) where

1771− countStar = UnsafeExpression "count(*)"

1772− count = unsafeAggregate1 "count"

1773− sum_ = unsafeAggregate1 "sum"

1774− arrayAgg = unsafeAggregate1 "array_agg"

1775− jsonAgg = unsafeAggregate1 "json_agg"

1776− jsonbAgg = unsafeAggregate1 "jsonb_agg"

1777− bitAnd = unsafeAggregate1 "bit_and"

1778− bitOr = unsafeAggregate1 "bit_or"

1779− boolAnd = unsafeAggregate1 "bool_and"

1780− boolOr = unsafeAggregate1 "bool_or"

1781− every = unsafeAggregate1 "every"

1782− max_ = unsafeAggregate1 "max"

1783− min_ = unsafeAggregate1 "min"

1784− avg = unsafeAggregate1 "avg"

1785− corr = unsafeAggregate2 "corr"

1786− covarPop = unsafeAggregate2 "covar_pop"

1787− covarSamp = unsafeAggregate2 "covar_samp"

1788− regrAvgX = unsafeAggregate2 "regr_avgx"

1789− regrAvgY = unsafeAggregate2 "regr_avgy"

1790− regrCount = unsafeAggregate2 "regr_count"

1791− regrIntercept = unsafeAggregate2 "regr_intercept"

1792− regrR2 = unsafeAggregate2 "regr_r2"

1793− regrSlope = unsafeAggregate2 "regr_slope"

1794− regrSxx = unsafeAggregate2 "regr_sxx"

1795− regrSxy = unsafeAggregate2 "regr_sxy"

1796− regrSyy = unsafeAggregate2 "regr_syy"

1797− stddev = unsafeAggregate1 "stddev"

1798− stddevPop = unsafeAggregate1 "stddev_pop"

1799− stddevSamp = unsafeAggregate1 "stddev_samp"

1800− variance = unsafeAggregate1 "variance"

1801− varPop = unsafeAggregate1 "var_pop"

1802− varSamp = unsafeAggregate1 "var_samp"

1803−instance Aggregate

1804− (Expression outer grp commons schemas params from)

1805− (Expression outer grp commons schemas params from :*: Expression outer grp commons schemas params from)

1806− (WindowFunction outer grp commons schemas params from) where

1807− countStar = UnsafeWindowFunction "count(*)"

1808− count = unsafeWindowFunction1 "count"

1809− sum_ = unsafeWindowFunction1 "sum"

1810− arrayAgg = unsafeWindowFunction1 "array_agg"

1811− jsonAgg = unsafeWindowFunction1 "json_agg"

1812− jsonbAgg = unsafeWindowFunction1 "jsonb_agg"

1813− bitAnd = unsafeWindowFunction1 "bit_and"

1814− bitOr = unsafeWindowFunction1 "bit_or"

1815− boolAnd = unsafeWindowFunction1 "bool_and"

1816− boolOr = unsafeWindowFunction1 "bool_or"

1817− every = unsafeWindowFunction1 "every"

1818− max_ = unsafeWindowFunction1 "max"

1819− min_ = unsafeWindowFunction1 "min"

1820− avg = unsafeWindowFunction1 "avg"

1821− corr = unsafeWindowFunction2 "corr"

1822− covarPop = unsafeWindowFunction2 "covar_pop"

1823− covarSamp = unsafeWindowFunction2 "covar_samp"

1824− regrAvgX = unsafeWindowFunction2 "regr_avgx"

1825− regrAvgY = unsafeWindowFunction2 "regr_avgy"

1826− regrCount = unsafeWindowFunction2 "regr_count"

1827− regrIntercept = unsafeWindowFunction2 "regr_intercept"

1828− regrR2 = unsafeWindowFunction2 "regr_r2"

1829− regrSlope = unsafeWindowFunction2 "regr_slope"

1830− regrSxx = unsafeWindowFunction2 "regr_sxx"

1831− regrSxy = unsafeWindowFunction2 "regr_sxy"

1832− regrSyy = unsafeWindowFunction2 "regr_syy"

1833− stddev = unsafeWindowFunction1 "stddev"

1834− stddevPop = unsafeWindowFunction1 "stddev_pop"

1835− stddevSamp = unsafeWindowFunction1 "stddev_samp"

1836− variance = unsafeWindowFunction1 "variance"

1837− varPop = unsafeWindowFunction1 "var_pop"

1838− varSamp = unsafeWindowFunction1 "var_samp"

1839−

1840−-- | escape hatch to define aggregate functions

1841−unsafeAggregate1

1842− :: ByteString -- ^ aggregate function

1843− -> Distinction (Expression outer 'Ungrouped commons schemas params from) xty

1844− -> Expression outer ('Grouped bys) commons schemas params from yty

1845−unsafeAggregate1 fun x = UnsafeExpression $ mconcat

1846− [fun, "(", renderSQL x, ")"]

1847−

1848−-- | escape hatch to define aggregate binary functions

1849−unsafeAggregate2

1850− :: ByteString -- ^ aggregate function

1851− -> Distinction (Expression outer 'Ungrouped commons schemas params from :*: Expression outer 'Ungrouped commons schemas params from) xty

1852− -> Expression outer ('Grouped bys) commons schemas params from yty

1853−unsafeAggregate2 fun xx = UnsafeExpression $ mconcat

1854− [fun, "(", renderSQL xx, ")"]

1855−

1856−-- | A type family that calculates `PGAvg` type of a `PGType`.

1857−type family PGAvg ty where

1858− PGAvg 'PGint2 = 'PGnumeric

1859− PGAvg 'PGint4 = 'PGnumeric

1860− PGAvg 'PGint8 = 'PGnumeric

1861− PGAvg 'PGnumeric = 'PGnumeric

1862− PGAvg 'PGfloat4 = 'PGfloat8

1863− PGAvg 'PGfloat8 = 'PGfloat8

1864− PGAvg 'PGinterval = 'PGinterval

1865− PGAvg pg = TypeError

1866− ('Text "Squeal type error: No average for " ':<>: 'ShowType pg)

1867−

1868−{-----------------------------------------

1869−type expressions

1870−-----------------------------------------}

1871−

1872−-- | `TypeExpression`s are used in `cast`s and

1873−-- `Squeal.PostgreSQL.Definition.createTable` commands.

1874−newtype TypeExpression (schemas :: SchemasType) (ty :: NullityType)

1875− = UnsafeTypeExpression { renderTypeExpression :: ByteString }

1876− deriving (GHC.Generic,Show,Eq,Ord,NFData)

1877−instance RenderSQL (TypeExpression schemas ty) where

1878− renderSQL = renderTypeExpression

1879−

1880−-- | The enum or composite type in a `Typedef` can be expressed by its alias.

1881−typedef

1882− :: (Has sch schemas schema, Has td schema ('Typedef ty))

1883− => QualifiedAlias sch td

1884− -> TypeExpression schemas (nullity ty)

1885−typedef = UnsafeTypeExpression . renderSQL

1886−

1887−-- | The composite type corresponding to a `Table` definition can be expressed

1888−-- by its alias.

1889−typetable

1890− :: (Has sch schemas schema, Has tab schema ('Table table))

1891− => QualifiedAlias sch tab

1892− -> TypeExpression schemas (nullity ('PGcomposite (TableToRow table)))

1893−typetable = UnsafeTypeExpression . renderSQL

1894−

1895−-- | The composite type corresponding to a `View` definition can be expressed

1896−-- by its alias.

1897−typeview

1898− :: (Has sch schemas schema, Has vw schema ('View view))

1899− => QualifiedAlias sch vw

1900− -> TypeExpression schemas (nullity ('PGcomposite view))

1901−typeview = UnsafeTypeExpression . renderSQL

1902−

1903−-- | logical Boolean (true/false)

1904−bool :: TypeExpression schemas (nullity 'PGbool)

1905−bool = UnsafeTypeExpression "bool"

1906−-- | signed two-byte integer

1907−int2, smallint :: TypeExpression schemas (nullity 'PGint2)

1908−int2 = UnsafeTypeExpression "int2"

1909−smallint = UnsafeTypeExpression "smallint"

1910−-- | signed four-byte integer

1911−int4, int, integer :: TypeExpression schemas (nullity 'PGint4)

1912−int4 = UnsafeTypeExpression "int4"

1913−int = UnsafeTypeExpression "int"

1914−integer = UnsafeTypeExpression "integer"

1915−-- | signed eight-byte integer

1916−int8, bigint :: TypeExpression schemas (nullity 'PGint8)

1917−int8 = UnsafeTypeExpression "int8"

1918−bigint = UnsafeTypeExpression "bigint"

1919−-- | arbitrary precision numeric type

1920−numeric :: TypeExpression schemas (nullity 'PGnumeric)

1921−numeric = UnsafeTypeExpression "numeric"

1922−-- | single precision floating-point number (4 bytes)

1923−float4, real :: TypeExpression schemas (nullity 'PGfloat4)

1924−float4 = UnsafeTypeExpression "float4"

1925−real = UnsafeTypeExpression "real"

1926−-- | double precision floating-point number (8 bytes)

1927−float8, doublePrecision :: TypeExpression schemas (nullity 'PGfloat8)

1928−float8 = UnsafeTypeExpression "float8"

1929−doublePrecision = UnsafeTypeExpression "double precision"

1930−-- | currency amount

1931−money :: TypeExpression schema (nullity 'PGmoney)

1932−money = UnsafeTypeExpression "money"

1933−-- | variable-length character string

1934−text :: TypeExpression schemas (nullity 'PGtext)

1935−text = UnsafeTypeExpression "text"

1936−-- | fixed-length character string

1937−char, character

1938− :: forall n schemas nullity. (KnownNat n, 1 <= n)

1939− => TypeExpression schemas (nullity ('PGchar n))

1940−char = UnsafeTypeExpression $ "char(" <> renderNat @n <> ")"

1941−character = UnsafeTypeExpression $ "character(" <> renderNat @n <> ")"

1942−-- | variable-length character string

1943−varchar, characterVarying

1944− :: forall n schemas nullity. (KnownNat n, 1 <= n)

1945− => TypeExpression schemas (nullity ('PGvarchar n))

1946−varchar = UnsafeTypeExpression $ "varchar(" <> renderNat @n <> ")"

1947−characterVarying = UnsafeTypeExpression $

1948− "character varying(" <> renderNat @n <> ")"

1949−-- | binary data ("byte array")

1950−bytea :: TypeExpression schemas (nullity 'PGbytea)

1951−bytea = UnsafeTypeExpression "bytea"

1952−-- | date and time (no time zone)

1953−timestamp :: TypeExpression schemas (nullity 'PGtimestamp)

1954−timestamp = UnsafeTypeExpression "timestamp"

1955−-- | date and time, including time zone

1956−timestampWithTimeZone :: TypeExpression schemas (nullity 'PGtimestamptz)

1957−timestampWithTimeZone = UnsafeTypeExpression "timestamp with time zone"

1958−-- | calendar date (year, month, day)

1959−date :: TypeExpression schemas (nullity 'PGdate)

1960−date = UnsafeTypeExpression "date"

1961−-- | time of day (no time zone)

1962−time :: TypeExpression schemas (nullity 'PGtime)

1963−time = UnsafeTypeExpression "time"

1964−-- | time of day, including time zone

1965−timeWithTimeZone :: TypeExpression schemas (nullity 'PGtimetz)

1966−timeWithTimeZone = UnsafeTypeExpression "time with time zone"

1967−-- | time span

1968−interval :: TypeExpression schemas (nullity 'PGinterval)

1969−interval = UnsafeTypeExpression "interval"

1970−-- | universally unique identifier

1971−uuid :: TypeExpression schemas (nullity 'PGuuid)

1972−uuid = UnsafeTypeExpression "uuid"

1973−-- | IPv4 or IPv6 host address

1974−inet :: TypeExpression schemas (nullity 'PGinet)

1975−inet = UnsafeTypeExpression "inet"

1976−-- | textual JSON data

1977−json :: TypeExpression schemas (nullity 'PGjson)

1978−json = UnsafeTypeExpression "json"

1979−-- | binary JSON data, decomposed

1980−jsonb :: TypeExpression schemas (nullity 'PGjsonb)

1981−jsonb = UnsafeTypeExpression "jsonb"

1982−-- | variable length array

1983−vararray

1984− :: TypeExpression schemas pg

1985− -> TypeExpression schemas (nullity ('PGvararray pg))

1986−vararray ty = UnsafeTypeExpression $ renderSQL ty <> "[]"

1987−-- | fixed length array

1988−--

1989−-- >>> renderSQL (fixarray @'[2] json)

1990−-- "json[2]"

1991−fixarray

1992− :: forall dims schemas nullity pg. SOP.All KnownNat dims

1993− => TypeExpression schemas pg

1994− -> TypeExpression schemas (nullity ('PGfixarray dims pg))

1995−fixarray ty = UnsafeTypeExpression $

1996− renderSQL ty <> renderDims @dims

1997− where

1998− renderDims :: forall ns. SOP.All KnownNat ns => ByteString

1999− renderDims =

2000− ("[" <>)

2001− . (<> "]")

2002− . ByteString.intercalate "]["

2003− . hcollapse

2004− $ hcmap (SOP.Proxy @KnownNat)

2005− (K . fromString . show . natVal)

2006− (hpure SOP.Proxy :: NP SOP.Proxy ns)

2007−

2008−-- | `pgtype` is a demoted version of a `PGType`

2009−class PGTyped schemas (ty :: NullityType) where

2010− pgtype :: TypeExpression schemas ty

2011−instance PGTyped schemas (nullity 'PGbool) where pgtype = bool

2012−instance PGTyped schemas (nullity 'PGint2) where pgtype = int2

2013−instance PGTyped schemas (nullity 'PGint4) where pgtype = int4

2014−instance PGTyped schemas (nullity 'PGint8) where pgtype = int8

2015−instance PGTyped schemas (nullity 'PGnumeric) where pgtype = numeric

2016−instance PGTyped schemas (nullity 'PGfloat4) where pgtype = float4

2017−instance PGTyped schemas (nullity 'PGfloat8) where pgtype = float8

2018−instance PGTyped schemas (nullity 'PGtext) where pgtype = text

2019−instance (KnownNat n, 1 <= n)

2020− => PGTyped schemas (nullity ('PGchar n)) where pgtype = char @n

2021−instance (KnownNat n, 1 <= n)

2022− => PGTyped schemas (nullity ('PGvarchar n)) where pgtype = varchar @n

2023−instance PGTyped schemas (nullity 'PGbytea) where pgtype = bytea

2024−instance PGTyped schemas (nullity 'PGtimestamp) where pgtype = timestamp

2025−instance PGTyped schemas (nullity 'PGtimestamptz) where pgtype = timestampWithTimeZone

2026−instance PGTyped schemas (nullity 'PGdate) where pgtype = date

2027−instance PGTyped schemas (nullity 'PGtime) where pgtype = time

2028−instance PGTyped schemas (nullity 'PGtimetz) where pgtype = timeWithTimeZone

2029−instance PGTyped schemas (nullity 'PGinterval) where pgtype = interval

2030−instance PGTyped schemas (nullity 'PGuuid) where pgtype = uuid

2031−instance PGTyped schemas (nullity 'PGjson) where pgtype = json

2032−instance PGTyped schemas (nullity 'PGjsonb) where pgtype = jsonb

2033−instance PGTyped schemas ty

2034− => PGTyped schemas (nullity ('PGvararray ty)) where

2035− pgtype = vararray (pgtype @schemas @ty)

2036−instance (SOP.All KnownNat dims, PGTyped schemas ty)

2037− => PGTyped schemas (nullity ('PGfixarray dims ty)) where

2038− pgtype = fixarray @dims (pgtype @schemas @ty)

2039−

2040−{-----------------------------------------

2041−Sorting

2042−-----------------------------------------}

2043−

2044−-- | `SortExpression`s are used by `orderBy` to optionally sort the results

2045−-- of a `Squeal.PostgreSQL.Query.Query`. `Asc` or `Desc`

2046−-- set the sort direction of a `NotNull` result

2047−-- column to ascending or descending. Ascending order puts smaller values

2048−-- first, where "smaller" is defined in terms of the `.<` operator. Similarly,

2049−-- descending order is determined with the `.>` operator. `AscNullsFirst`,

2050−-- `AscNullsLast`, `DescNullsFirst` and `DescNullsLast` options are used to

2051−-- determine whether nulls appear before or after non-null values in the sort

2052−-- ordering of a `Null` result column.

2053−data SortExpression outer grp commons schemas params from where

2054− Asc

2055− :: Expression outer grp commons schemas params from ('NotNull ty)

2056− -> SortExpression outer grp commons schemas params from

2057− Desc

2058− :: Expression outer grp commons schemas params from ('NotNull ty)

2059− -> SortExpression outer grp commons schemas params from

2060− AscNullsFirst

2061− :: Expression outer grp commons schemas params from ('Null ty)

2062− -> SortExpression outer grp commons schemas params from

2063− AscNullsLast

2064− :: Expression outer grp commons schemas params from ('Null ty)

2065− -> SortExpression outer grp commons schemas params from

2066− DescNullsFirst

2067− :: Expression outer grp commons schemas params from ('Null ty)

2068− -> SortExpression outer grp commons schemas params from

2069− DescNullsLast

2070− :: Expression outer grp commons schemas params from ('Null ty)

2071− -> SortExpression outer grp commons schemas params from

2072−deriving instance Show (SortExpression outer grp commons schemas params from)

2073−

2074−{- |

2075−The `orderBy` clause causes the result rows of a `Squeal.PostgreSQL.Query.TableExpression`

2076−to be sorted according to the specified `SortExpression`(s).

2077−If two rows are equal according to the leftmost expression,

2078−they are compared according to the next expression and so on.

2079−If they are equal according to all specified expressions,

2080−they are returned in an implementation-dependent order.

2081−

2082−You can also control the order in which rows are processed by window functions

2083−using `orderBy` within `Squeal.PostgreSQL.Query.Over`.

2084−-}

2085−class OrderBy expr where

2086− orderBy

2087− :: [SortExpression outer grp commons schemas params from]

2088− -> expr outer grp commons schemas params from

2089− -> expr outer grp commons schemas params from

2090−

2091−-- | Render a `SortExpression`.

2092−instance RenderSQL (SortExpression outer grp commons schemas params from) where

2093− renderSQL = \case

2094− Asc expression -> renderSQL expression <+> "ASC"

2095− Desc expression -> renderSQL expression <+> "DESC"

2096− AscNullsFirst expression -> renderSQL expression

2097− <+> "ASC NULLS FIRST"

2098− DescNullsFirst expression -> renderSQL expression

2099− <+> "DESC NULLS FIRST"

2100− AscNullsLast expression -> renderSQL expression <+> "ASC NULLS LAST"

2101− DescNullsLast expression -> renderSQL expression <+> "DESC NULLS LAST"

2102−

2103−-- | A `WindowDefinition` is a set of table rows that are somehow related

2104−-- to the current row

2105−data WindowDefinition outer grp commons schemas params from where

2106− WindowDefinition

2107− :: SListI bys

2108− => NP (Expression outer grp commons schemas params from) bys

2109− -> [SortExpression outer grp commons schemas params from]

2110− -> WindowDefinition outer grp commons schemas params from

2111−

2112−instance OrderBy WindowDefinition where

2113− orderBy sortsR (WindowDefinition parts sortsL)

2114− = WindowDefinition parts (sortsL ++ sortsR)

2115−

2116−instance RenderSQL (WindowDefinition outer commons schemas from grp params) where

2117− renderSQL (WindowDefinition part ord) =

2118− renderPartitionByClause part <> renderOrderByClause ord

2119− where

2120− renderPartitionByClause = \case

2121− Nil -> ""

2122− parts -> "PARTITION" <+> "BY" <+> renderCommaSeparated renderExpression parts

2123− renderOrderByClause = \case

2124− [] -> ""

2125− srts -> " ORDER" <+> "BY"

2126− <+> commaSeparated (renderSQL <$> srts)

2127−

2128−{- |

2129−The `partitionBy` clause within `Squeal.PostgreSQL.Query.Over` divides the rows into groups,

2130−or partitions, that share the same values of the `partitionBy` `Expression`(s).

2131−For each row, the window function is computed across the rows that fall into

2132−the same partition as the current row.

2133−-}

2134−partitionBy

2135− :: SListI bys

2136− => NP (Expression outer grp commons schemas params from) bys

2137− -> WindowDefinition outer grp commons schemas params from

2138−partitionBy bys = WindowDefinition bys []

2139−

2140−{- |

2141−A window function performs a calculation across a set of table rows

2142−that are somehow related to the current row. This is comparable to the type

2143−of calculation that can be done with an aggregate function.

2144−However, window functions do not cause rows to become grouped into a single

2145−output row like non-window aggregate calls would.

2146−Instead, the rows retain their separate identities.

2147−Behind the scenes, the window function is able to access more than

2148−just the current row of the query result.

2149−-}

2150−newtype WindowFunction

2151− (outer :: FromType)

2152− (grp :: Grouping)

2153− (commons :: FromType)

2154− (schemas :: SchemasType)

2155− (params :: [NullityType])

2156− (from :: FromType)

2157− (ty :: NullityType)

2158− = UnsafeWindowFunction { renderWindowFunction :: ByteString }

2159− deriving (GHC.Generic,Show,Eq,Ord,NFData)

2160−

2161−instance RenderSQL (WindowFunction outer grp commons schemas params from ty) where

2162− renderSQL = renderWindowFunction

2163−

2164−unsafeWindowFunction1

2165− :: ByteString

2166− -> Expression outer grp commons schemas params from ty0

2167− -> WindowFunction outer grp commons schemas params from ty1

2168−unsafeWindowFunction1 fun x

2169− = UnsafeWindowFunction $ fun <> parenthesized (renderSQL x)

2170−

2171−unsafeWindowFunction2

2172− :: ByteString

2173− -> (Expression outer grp commons schemas params from :*: Expression outer grp commons schemas params from) ty0

2174− -> WindowFunction outer grp commons schemas params from ty1

2175−unsafeWindowFunction2 fun (x :*: x')

2176− = UnsafeWindowFunction $ fun <> parenthesized (renderSQL x <> ", " <> renderSQL x')

2177−

2178−{- | rank of the current row with gaps; same as `rowNumber` of its first peer

2179−>>> printSQL rank

2180−rank()

2181−-}

2182−rank :: WindowFunction outer grp commons schemas params from ('NotNull 'PGint8)

2183−rank = UnsafeWindowFunction "rank()"

2184−

2185−{- | number of the current row within its partition, counting from 1

2186−>>> printSQL rowNumber

2187−row_number()

2188−-}

2189−rowNumber :: WindowFunction outer grp commons schemas params from ('NotNull 'PGint8)

2190−rowNumber = UnsafeWindowFunction "row_number()"

2191−

2192−{- | rank of the current row without gaps; this function counts peer groups

2193−>>> printSQL denseRank

2194−dense_rank()

2195−-}

2196−denseRank :: WindowFunction outer grp commons schemas params from ('NotNull 'PGint8)

2197−denseRank = UnsafeWindowFunction "dense_rank()"

2198−

2199−{- | relative rank of the current row: (rank - 1) / (total partition rows - 1)

2200−>>> printSQL percentRank

2201−percent_rank()

2202−-}

2203−percentRank :: WindowFunction outer grp commons schemas params from ('NotNull 'PGfloat8)

2204−percentRank = UnsafeWindowFunction "percent_rank()"

2205−

2206−{- | cumulative distribution: (number of partition rows

2207−preceding or peer with current row) / total partition rows

2208−>>> printSQL cumeDist

2209−cume_dist()

2210−-}

2211−cumeDist :: WindowFunction outer grp commons schemas params from ('NotNull 'PGfloat8)

2212−cumeDist = UnsafeWindowFunction "cume_dist()"

2213−

2214−{- | integer ranging from 1 to the argument value,

2215−dividing the partition as equally as possible

2216−-}

2217−ntile

2218− :: Expression outer grp commons schemas params from ('NotNull 'PGint4)

2219− -- ^ num buckets

2220− -> WindowFunction outer grp commons schemas params from ('NotNull 'PGint4)

2221−ntile = unsafeWindowFunction1 "ntile"

2222−

2223−{- | returns value evaluated at the row that is offset rows before the current

2224−row within the partition; if there is no such row, instead return default

2225−(which must be of the same type as value). Both offset and default are

2226−evaluated with respect to the current row.

2227−-}

2228−lag

2229− :: Expression outer grp commons schemas params from ty

2230− -- ^ value

2231− -> Expression outer grp commons schemas params from ('NotNull 'PGint4)

2232− -- ^ offset

2233− -> Expression outer grp commons schemas params from ty

2234− -- ^ default

2235− -> WindowFunction outer grp commons schemas params from ty

2236−lag value offset def = UnsafeWindowFunction $ "lag"

2237− <> parenthesized

2238− (commaSeparated ([renderSQL value, renderSQL offset, renderSQL def]))

2239−

2240−{- | returns value evaluated at the row that is offset rows after the current

2241−row within the partition; if there is no such row, instead return default

2242−(which must be of the same type as value). Both offset and default are

2243−evaluated with respect to the current row.

2244−-}

2245−lead

2246− :: Expression outer grp commons schemas params from ty

2247− -- ^ value

2248− -> Expression outer grp commons schemas params from ('NotNull 'PGint4)

2249− -- ^ offset

2250− -> Expression outer grp commons schemas params from ty

2251− -- ^ default

2252− -> WindowFunction outer grp commons schemas params from ty

2253−lead value offset def = UnsafeWindowFunction $ "lag"

2254− <> parenthesized

2255− (commaSeparated ([renderSQL value, renderSQL offset, renderSQL def]))

2256−

2257−{- | returns value evaluated at the row that is the

2258−first row of the window frame

2259−-}

2260−firstValue

2261− :: Expression outer grp commons schemas params from ty

2262− -- ^ value

2263− -> WindowFunction outer grp commons schemas params from ty

2264−firstValue = unsafeWindowFunction1 "first_value"

2265−

2266−{- | returns value evaluated at the row that is the

2267−last row of the window frame

2268−-}

2269−lastValue

2270− :: Expression outer grp commons schemas params from ty

2271− -- ^ value

2272− -> WindowFunction outer grp commons schemas params from ty

2273−lastValue = unsafeWindowFunction1 "last_value"

2274−

2275−{- | returns value evaluated at the row that is the nth

2276−row of the window frame (counting from 1); null if no such row

2277−-}

2278−nthValue

2279− :: Expression outer grp commons schemas params from (nullity ty)

2280− -- ^ value

2281− -> Expression outer grp commons schemas params from ('NotNull 'PGint4)

2282− -- ^ nth

2283− -> WindowFunction outer grp commons schemas params from ('Null ty)

2284−nthValue value nth = UnsafeWindowFunction $ "nth_value"

2285− <> parenthesized (commaSeparated [renderSQL value, renderSQL nth])

squeal-postgresql/src/Squeal/PostgreSQL/Expression/Aggregate.hsnew file+462

@@ -0,0 +1,462 @@

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

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.hsnew file+169

@@ -0,0 +1,169 @@

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

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.hsnew file+206

@@ -0,0 +1,206 @@

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

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.hsnew file+462

@@ -0,0 +1,462 @@

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

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.hsnew file+87

@@ -0,0 +1,87 @@

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

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.hsnew file+105

@@ -0,0 +1,105 @@

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

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.hsnew file+100

@@ -0,0 +1,100 @@

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

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.hsnew file+104

@@ -0,0 +1,104 @@

1+{-|

2+Module: Squeal.PostgreSQL.Expression.Null

3+Description: Null

4+Copyright: (c) Eitan Chatav, 2019

5+Maintainer: eitan@morphism.tech

6+Stability: experimental

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.hsnew file+80

@@ -0,0 +1,80 @@

1+{-|

2+Module: Squeal.PostgreSQL.Expression.Parameter

3+Description: Parameters

4+Copyright: (c) Eitan Chatav, 2019

5+Maintainer: eitan@morphism.tech

6+Stability: experimental

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.hsnew file+230

@@ -0,0 +1,230 @@

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

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.hsnew file+139

@@ -0,0 +1,139 @@

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

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.hsnew file+85

@@ -0,0 +1,85 @@

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

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.hsnew file+120

@@ -0,0 +1,120 @@

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

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.hsnew file+64

@@ -0,0 +1,64 @@

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

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.hsnew file+157

@@ -0,0 +1,157 @@

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

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.hsnew file+192

@@ -0,0 +1,192 @@

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

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.hsnew file+446

@@ -0,0 +1,446 @@

1+{-|

2+Module: Squeal.PostgreSQL.Expression

3+Description: Type expressions

4+Copyright: (c) Eitan Chatav, 2019

5+Maintainer: eitan@morphism.tech

6+Stability: experimental

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.hsnew file+284

@@ -0,0 +1,284 @@

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

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.hsnew file+112

@@ -0,0 +1,112 @@

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

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+170−178

@@ -18,6 +18,7 @@ Squeal data manipulation language.

18 , MultiParamTypeClasses

19 , OverloadedStrings

20 , PatternSynonyms

21+ , QuantifiedConstraints

21 , RankNTypes

22 , RankNTypes

22 , ScopedTypeVariables

23 , ScopedTypeVariables

23 , TypeApplications

24 , TypeApplications

@@ -29,19 +30,9 @@ Squeal data manipulation language.

30module Squeal.PostgreSQL.Manipulation

31module Squeal.PostgreSQL.Manipulation

31 ( -- * Manipulation

32 ( -- * Manipulation

33+ Manipulation_

32− Manipulation (..)

34+ , Manipulation (..)

33− , Manipulation_

34 , queryStatement

35 , queryStatement

35− , QueryClause (..)

36− , pattern Values_

37− , DefaultAliasable (..)

38− , ColumnExpression (..)

39− , ReturningClause (..)

40− , pattern Returning_

41− , ConflictClause (..)

42− , ConflictTarget (..)

43− , ConflictAction (..)

44− , UsingClause (..)

45 -- * Insert

36 -- * Insert

46 , insertInto

37 , insertInto

47 , insertInto_

38 , insertInto_

@@ -51,37 +42,95 @@ module Squeal.PostgreSQL.Manipulation

51 -- * Delete

42 -- * Delete

52 , deleteFrom

43 , deleteFrom

53 , deleteFrom_

44 , deleteFrom_

54− , also

45+ -- * Clauses

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)

62import qualified Generics.SOP as SOP

61import qualified Generics.SOP as SOP

63import qualified GHC.Generics as GHC

62import qualified GHC.Generics as GHC

65−import Squeal.PostgreSQL.Binary

64+import Squeal.PostgreSQL.Alias

66import Squeal.PostgreSQL.Expression

65import Squeal.PostgreSQL.Expression

66+import Squeal.PostgreSQL.Expression.Logic

67+import Squeal.PostgreSQL.List

68+import Squeal.PostgreSQL.PG

67import Squeal.PostgreSQL.Render

69import Squeal.PostgreSQL.Render

68import Squeal.PostgreSQL.Query

70import Squeal.PostgreSQL.Query

69import Squeal.PostgreSQL.Schema

71import Squeal.PostgreSQL.Schema

73+-- $setup

74+-- >>> import Squeal.PostgreSQL

75+-- >>> import Data.Int

76+-- >>> import Data.Time

77+

71{- |

78{- |

72A `Manipulation` is a statement which may modify data in the database,

79A `Manipulation` is a statement which may modify data in the database,

73but does not alter its schemas. Examples are inserts, updates and deletes.

80but does not alter its schemas. Examples are inserts, updates and deletes.

74A `Query` is also considered a `Manipulation` even though it does not modify data.

81A `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+

76simple insert:

125simple insert:

126

78>>> type Columns = '["col1" ::: 'NoDef :=> 'Null 'PGint4, "col2" ::: 'Def :=> 'NotNull 'PGint4]

127>>> type Columns = '["col1" ::: 'NoDef :=> 'Null 'PGint4, "col2" ::: 'Def :=> 'NotNull 'PGint4]

79>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]

128>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]

80>>> :{

129>>> :{

81let

130let

82− manipulation :: Manipulation '[] (Public Schema) '[] '[]

131+ manipulation :: Manipulation_ (Public Schema) () ()

83 manipulation =

132 manipulation =

84− insertInto_ #tab (Values_ (2 `as` #col1 :* defaultAs #col2))

133+ insertInto_ #tab (Values_ (Set 2 `as` #col1 :* Default `as` #col2))

85in printSQL manipulation

134in printSQL manipulation

86:}

135:}

87INSERT INTO "tab" ("col1", "col2") VALUES (2, DEFAULT)

136INSERT INTO "tab" ("col1", "col2") VALUES (2, DEFAULT)

@@ -92,9 +141,9 @@ parameterized insert:

92>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]

141>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]

93>>> :{

142>>> :{

94let

143let

95− manipulation :: Manipulation '[] (Public Schema) '[ 'NotNull 'PGint4, 'NotNull 'PGint4 ] '[]

144+ manipulation :: Manipulation_ (Public Schema) (Int32, Int32) ()

96 manipulation =

145 manipulation =

97− insertInto_ #tab (Values_ (param @1 `as` #col1 :* param @2 `as` #col2))

146+ insertInto_ #tab (Values_ (Set (param @1) `as` #col1 :* Set (param @2) `as` #col2))

98in printSQL manipulation

147in printSQL manipulation

99:}

148:}

100INSERT INTO "tab" ("col1", "col2") VALUES (($1 :: int4), ($2 :: int4))

149INSERT INTO "tab" ("col1", "col2") VALUES (($1 :: int4), ($2 :: int4))

@@ -103,9 +152,9 @@ returning insert:

103

152

104>>> :{

153>>> :{

105let

154let

106− manipulation :: Manipulation '[] (Public Schema) '[] '["fromOnly" ::: 'NotNull 'PGint4]

155+ manipulation :: Manipulation_ (Public Schema) () (Only Int32)

107 manipulation =

156 manipulation =

108− insertInto #tab (Values_ (2 `as` #col1 :* 3 `as` #col2))

157+ insertInto #tab (Values_ (Set 2 `as` #col1 :* Set 3 `as` #col2))

109 OnConflictDoRaise (Returning (#col1 `as` #fromOnly))

158 OnConflictDoRaise (Returning (#col1 `as` #fromOnly))

110in printSQL manipulation

159in printSQL manipulation

111:}

160:}

@@ -118,12 +167,12 @@ upsert:

118>>> type CustomersSchema = '["customers" ::: 'Table (CustomersConstraints :=> CustomersColumns)]

167>>> type CustomersSchema = '["customers" ::: 'Table (CustomersConstraints :=> CustomersColumns)]

119>>> :{

168>>> :{

120let

169let

121− manipulation :: Manipulation '[] (Public CustomersSchema) '[] '[]

170+ manipulation :: Manipulation_ (Public CustomersSchema) () ()

122 manipulation =

171 manipulation =

123 insertInto #customers

172 insertInto #customers

124− (Values_ ("John Smith" `as` #name :* "john@smith.com" `as` #email))

173+ (Values_ (Set "John Smith" `as` #name :* Set "john@smith.com" `as` #email))

125 (OnConflict (OnConstraint #uq)

174 (OnConflict (OnConstraint #uq)

126− (DoUpdate (((#excluded ! #email) <> "; " <> (#customers ! #email)) `as` #email) []))

175+ (DoUpdate (Set (#excluded ! #email <> "; " <> #customers ! #email) `as` #email) []))

127 (Returning_ Nil)

176 (Returning_ Nil)

128in printSQL manipulation

177in printSQL manipulation

129:}

178:}

@@ -133,7 +182,7 @@ query insert:

133

182

134>>> :{

183>>> :{

135let

184let

136− manipulation :: Manipulation '[] (Public Schema) '[] '[]

185+ manipulation :: Manipulation_ (Public Schema) () ()

137 manipulation = insertInto_ #tab (Subquery (select Star (from (table #tab))))

186 manipulation = insertInto_ #tab (Subquery (select Star (from (table #tab))))

138in printSQL manipulation

187in printSQL manipulation

139:}

188:}

@@ -143,8 +192,8 @@ update:

143

192

144>>> :{

193>>> :{

145let

194let

146− manipulation :: Manipulation '[] (Public Schema) '[] '[]

195+ manipulation :: Manipulation_ (Public Schema) () ()

147− manipulation = update_ #tab (2 `as` #col1) (#col1 ./= #col2)

196+ manipulation = update_ #tab (Set 2 `as` #col1) (#col1 ./= #col2)

148in printSQL manipulation

197in printSQL manipulation

149:}

198:}

150UPDATE "tab" SET "col1" = 2 WHERE ("col1" <> "col2")

199UPDATE "tab" SET "col1" = 2 WHERE ("col1" <> "col2")

@@ -153,9 +202,7 @@ delete:

153

202

154>>> :{

203>>> :{

155let

204let

156− manipulation :: Manipulation '[] (Public Schema) '[]

205+ manipulation :: Manipulation_ (Public Schema) () (Row Int32 Int32)

157− '[ "col1" ::: 'NotNull 'PGint4

158− , "col2" ::: 'NotNull 'PGint4 ]

159 manipulation = deleteFrom #tab NoUsing (#col1 .== #col2) (Returning Star)

206 manipulation = deleteFrom #tab NoUsing (#col1 .== #col2) (Returning Star)

160in printSQL manipulation

207in printSQL manipulation

161:}

208:}

@@ -166,13 +213,13 @@ delete and using clause:

166>>> :{

213>>> :{

167type Schema3 =

214type Schema3 =

168 '[ "tab" ::: 'Table ('[] :=> Columns)

215 '[ "tab" ::: 'Table ('[] :=> Columns)

169− , "other_tab" ::: 'Table ('[] :=> Columns)

216+ , "other_tab" ::: 'Table ('[] :=> Columns)

170− , "third_tab" ::: 'Table ('[] :=> Columns) ]

217+ , "third_tab" ::: 'Table ('[] :=> Columns) ]

171:}

218:}

172

219

173>>> :{

220>>> :{

174let

221let

175− manipulation :: Manipulation '[] (Public Schema3) '[] '[]

222+ manipulation :: Manipulation_ (Public Schema3) () ()

176 manipulation =

223 manipulation =

177 deleteFrom #tab (Using (table #other_tab & also (table #third_tab)))

224 deleteFrom #tab (Using (table #other_tab & also (table #third_tab)))

178 ( (#tab ! #col2 .== #other_tab ! #col2)

225 ( (#tab ! #col2 .== #other_tab ! #col2)

@@ -188,7 +235,7 @@ with manipulation:

188>>> type ProductsSchema = '["products" ::: 'Table ('[] :=> ProductsColumns), "products_deleted" ::: 'Table ('[] :=> ProductsColumns)]

235>>> type ProductsSchema = '["products" ::: 'Table ('[] :=> ProductsColumns), "products_deleted" ::: 'Table ('[] :=> ProductsColumns)]

189>>> :{

236>>> :{

190let

237let

191− manipulation :: Manipulation '[] (Public ProductsSchema) '[ 'NotNull 'PGdate] '[]

238+ manipulation :: Manipulation_ (Public ProductsSchema) (Only Day) ()

192 manipulation = with

239 manipulation = with

193 (deleteFrom #products NoUsing (#date .< param @1) (Returning Star) `as` #del)

240 (deleteFrom #products NoUsing (#date .< param @1) (Returning Star) `as` #del)

194 (insertInto_ #products_deleted (Subquery (select Star (from (common #del)))))

241 (insertInto_ #products_deleted (Subquery (select Star (from (common #del)))))

@@ -196,27 +243,13 @@ in printSQL manipulation

196:}

243:}

197WITH "del" AS (DELETE FROM "products" WHERE ("date" < ($1 :: date)) RETURNING *) INSERT INTO "products_deleted" SELECT * FROM "del" AS "del"

244WITH "del" AS (DELETE FROM "products" WHERE ("date" < ($1 :: date)) RETURNING *) INSERT INTO "products_deleted" SELECT * FROM "del" AS "del"

198-}

245-}

199−

200−newtype Manipulation

201− (commons :: FromType)

202− (schemas :: SchemasType)

203− (params :: [NullityType])

204− (columns :: RowType)

205− = UnsafeManipulation { renderManipulation :: ByteString }

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

207−instance RenderSQL (Manipulation commons schemas params columns) where

208− renderSQL = renderManipulation

209−instance With Manipulation where

210− with Done manip = manip

211− with ctes manip = UnsafeManipulation $

212− "WITH" <+> renderSQL ctes <+> renderSQL manip

213−

214type family Manipulation_ (schemas :: SchemasType) (params :: Type) (row :: Type) where

246type family Manipulation_ (schemas :: SchemasType) (params :: Type) (row :: Type) where

215 Manipulation_ schemas params row = Manipulation '[] schemas (TuplePG params) (RowPG row)

247 Manipulation_ schemas params row = Manipulation '[] schemas (TuplePG params) (RowPG row)

216

248

217-- | Convert a `Query` into a `Manipulation`.

249-- | Convert a `Query` into a `Manipulation`.

218queryStatement

250queryStatement

219 :: Query '[] commons schemas params columns

251 :: Query '[] commons schemas params columns

252+ -- ^ `Query` to embed as a `Manipulation`

220 -> Manipulation commons schemas params columns

253 -> Manipulation commons schemas params columns

221queryStatement q = UnsafeManipulation $ renderSQL q

254queryStatement q = UnsafeManipulation $ renderSQL q

222

255

@@ -239,9 +272,13 @@ insertInto

239 , SOP.SListI columns

272 , SOP.SListI columns

240 , SOP.SListI row1 )

273 , SOP.SListI row1 )

241 => QualifiedAlias sch tab

274 => QualifiedAlias sch tab

275+ -- ^ table

242 -> QueryClause commons schemas params columns

276 -> QueryClause commons schemas params columns

277+ -- ^ what to insert

243 -> ConflictClause tab commons schemas params table

278 -> ConflictClause tab commons schemas params table

279+ -- ^ what to do in case of conflict

244 -> ReturningClause commons schemas params '[tab ::: row0] row1

280 -> ReturningClause commons schemas params '[tab ::: row0] row1

281+ -- ^ what to return

245 -> Manipulation commons schemas params row1

282 -> Manipulation commons schemas params row1

246insertInto tab qry conflict ret = UnsafeManipulation $

283insertInto tab qry conflict ret = UnsafeManipulation $

247 "INSERT" <+> "INTO" <+> renderSQL tab

284 "INSERT" <+> "INTO" <+> renderSQL tab

@@ -249,6 +286,7 @@ insertInto tab qry conflict ret = UnsafeManipulation $

249 <> renderSQL conflict

286 <> renderSQL conflict

250 <> renderSQL ret

287 <> renderSQL ret

251

288

289+-- | Like `insertInto` but with `OnConflictDoRaise` and `no` `ReturningClause`.

252insertInto_

290insertInto_

253 :: ( Has sch schemas schema

291 :: ( Has sch schemas schema

254 , Has tab schema ('Table table)

292 , Has tab schema ('Table table)

@@ -256,25 +294,33 @@ insertInto_

256 , row ~ TableToRow table

294 , row ~ TableToRow table

257 , SOP.SListI columns )

295 , SOP.SListI columns )

258 => QualifiedAlias sch tab

296 => QualifiedAlias sch tab

297+ -- ^ table

259 -> QueryClause commons schemas params columns

298 -> QueryClause commons schemas params columns

299+ -- ^ what to insert

260 -> Manipulation commons schemas params '[]

300 -> Manipulation commons schemas params '[]

261insertInto_ tab qry =

301insertInto_ tab qry =

262 insertInto tab qry OnConflictDoRaise (Returning_ Nil)

302 insertInto tab qry OnConflictDoRaise (Returning_ Nil)

263

303

304+-- | A `QueryClause` describes what to `insertInto` a table.

264data QueryClause commons schemas params columns where

305data QueryClause commons schemas params columns where

265 Values

306 Values

266 :: SOP.SListI columns

307 :: SOP.SListI columns

267− => NP (ColumnExpression 'Ungrouped schemas params '[]) columns

308+ => NP (Aliased (Optional (Expression '[] commons 'Ungrouped schemas params '[]))) columns

309+ -- ^ row of values

268− -> [NP (ColumnExpression 'Ungrouped schemas params '[]) columns]

310+ -> [NP (Aliased (Optional (Expression '[] commons 'Ungrouped schemas params '[]))) columns]

311+ -- ^ additional rows of values

269 -> QueryClause commons schemas params columns

312 -> QueryClause commons schemas params columns

270 Select

313 Select

271 :: SOP.SListI columns

314 :: SOP.SListI columns

272− => NP (ColumnExpression grp schemas params from) columns

315+ => NP (Aliased (Optional (Expression '[] commons grp schemas params from))) columns

316+ -- ^ row of values

273− -> TableExpression '[] grp commons schemas params from

317+ -> TableExpression '[] commons grp schemas params from

318+ -- ^ from a table expression

274 -> QueryClause commons schemas params columns

319 -> QueryClause commons schemas params columns

275 Subquery

320 Subquery

276 :: ColumnsToRow columns ~ row

321 :: ColumnsToRow columns ~ row

277 => Query '[] commons schemas params row

322 => Query '[] commons schemas params row

323+ -- ^ subquery to insert

278 -> QueryClause commons schemas params columns

324 -> QueryClause commons schemas params columns

279

325

280instance RenderSQL (QueryClause commons schemas params columns) where

326instance RenderSQL (QueryClause commons schemas params columns) where

@@ -293,109 +339,41 @@ instance RenderSQL (QueryClause commons schemas params columns) where

293 Subquery qry -> renderQuery qry

339 Subquery qry -> renderQuery qry

294 where

340 where

295 renderSQLPartMaybe, renderValuePartMaybe

341 renderSQLPartMaybe, renderValuePartMaybe

296− :: ColumnExpression grp schemas params from column -> Maybe ByteString

342+ :: Aliased (Optional (Expression '[] commons grp schemas params from)) column

343+ -> Maybe ByteString

297 renderSQLPartMaybe = \case

344 renderSQLPartMaybe = \case

298− DefaultAs _ -> Nothing

345+ Default `As` _ -> Nothing

299− Specific (_ `As` name) -> Just $ renderSQL name

346+ Set _ `As` name -> Just $ renderSQL name

300 renderValuePartMaybe = \case

347 renderValuePartMaybe = \case

301− DefaultAs _ -> Nothing

348+ Default `As` _ -> Nothing

302− Specific (value `As` _) -> Just $ renderExpression value

349+ Set value `As` _ -> Just $ renderExpression value

303 renderSQLPart, renderValuePart

350 renderSQLPart, renderValuePart

304− :: ColumnExpression grp schemas params from column -> ByteString

351+ :: Aliased (Optional (Expression '[] commons grp schemas params from)) column

305− renderSQLPart = \case

352+ -> ByteString

306− DefaultAs name -> renderSQL name

307− Specific (_ `As` name) -> renderSQL name

353+ renderSQLPart (_ `As` name) = renderSQL name

308− renderValuePart = \case

354+ renderValuePart (value `As` _) = renderSQL value

309− DefaultAs _ -> "DEFAULT"

310− Specific (value `As` _) -> renderExpression value

311

355

356+-- | `Values_` describes a single `NP` list of `Aliased` `Optional` `Expression`s

357+-- whose `ColumnsType` must match the tables'.

312pattern Values_

358pattern Values_

313 :: SOP.SListI columns

359 :: SOP.SListI columns

314− => NP (ColumnExpression 'Ungrouped schemas params '[]) columns

360+ => NP (Aliased (Optional (Expression '[] commons 'Ungrouped schemas params '[]))) columns

361+ -- ^ row of values

315 -> QueryClause commons schemas params columns

362 -> QueryClause commons schemas params columns

316pattern Values_ vals = Values vals []

363pattern Values_ vals = Values vals []

317

364

318−data ColumnExpression grp schemas params from column where

365+-- | `Optional` is either `Default` or a value, parameterized by an appropriate

319− DefaultAs

366+-- `ColumnConstraint`.

320− :: KnownSymbol col

367+data Optional expr ty where

321− => Alias col

368+ -- | Use the `Default` value for a column.

322− -> ColumnExpression grp schemas params from (col ::: 'Def :=> ty)

369+ Default :: Optional expr ('Def :=> ty)

323− Specific

370+ -- | `Set` a value for a column.

324− :: Aliased (Expression '[] grp '[] schemas params from) (col ::: ty)

371+ Set :: expr ty -> Optional expr (def :=> ty)

325− -> ColumnExpression grp schemas params from (col ::: defness :=> ty)

372+

326−

373+instance (forall x. RenderSQL (expr x)) => RenderSQL (Optional expr ty) where

327−instance (KnownSymbol col, column ~ (col ::: defness :=> ty))

328− => Aliasable col

329− (Expression '[] grp '[] schemas params from ty)

330− (ColumnExpression grp schemas params from column) where

331− expression `as` col = Specific (expression `As` col)

332−instance (KnownSymbol col, columns ~ '[col ::: defness :=> ty])

333− => Aliasable col

334− (Expression '[] grp '[] schemas params from ty)

335− (NP (ColumnExpression grp schemas params from) columns) where

336− expression `as` col = expression `as` col :* Nil

337−instance (KnownSymbol col, column ~ (col ::: 'Def :=> ty))

338− => DefaultAliasable col (ColumnExpression grp schemas params from column) where

339− defaultAs = DefaultAs

340−instance (KnownSymbol col, columns ~ '[col ::: 'Def :=> ty])

341− => DefaultAliasable col (NP (ColumnExpression grp schemas params from) columns) where

342− defaultAs col = defaultAs col :* Nil

343−

344−instance (HasUnique tab from row, Has col row ty, column ~ (col ::: defness :=> ty))

345− => IsLabel col (ColumnExpression 'Ungrouped schemas params from column) where

346− fromLabel = fromLabel @col `as` Alias

347−instance (HasUnique tab from row, Has col row ty, columns ~ '[col ::: defness :=> ty])

348− => IsLabel col

349− (NP (ColumnExpression 'Ungrouped schemas params from) columns) where

350− fromLabel = fromLabel @col `as` Alias

351−

352−instance (Has tab from row, Has col row ty, column ~ (col ::: defness :=> ty))

353− => IsQualified tab col (ColumnExpression 'Ungrouped schemas params from column) where

354− tab ! col = tab ! col `as` col

355−instance (Has tab from row, Has col row ty, columns ~ '[col ::: defness :=> ty])

356− => IsQualified tab col (NP (ColumnExpression 'Ungrouped schemas params from) columns) where

357− tab ! col = tab ! col `as` col

358−

359−instance

360− ( HasUnique tab from row

361− , Has col row ty

362− , GroupedBy tab col bys

363− , column ~ (col ::: defness :=> ty)

364− ) => IsLabel col

365− (ColumnExpression ('Grouped bys) schemas params from column) where

366− fromLabel = fromLabel @col `as` Alias

367−instance

368− ( HasUnique tab from row

369− , Has col row ty

370− , GroupedBy tab col bys

371− , columns ~ '[col ::: defness :=> ty]

372− ) => IsLabel col

373− (NP (ColumnExpression ('Grouped bys) schemas params from) columns) where

374− fromLabel = fromLabel @col `as` Alias

375−

376−instance

377− ( Has tab from row

378− , Has col row ty

379− , GroupedBy tab col bys

380− , column ~ (col ::: defness :=> ty)

381− ) => IsQualified tab col

382− (ColumnExpression ('Grouped bys) schemas params from column) where

383− tab ! col = tab ! col `as` col

384−instance

385− ( Has tab from row

386− , Has col row ty

387− , GroupedBy tab col bys

388− , columns ~ '[col ::: defness :=> ty]

389− ) => IsQualified tab col

390− (NP (ColumnExpression ('Grouped bys) schemas params from) columns) where

391− tab ! col = tab ! col :* Nil

392−

393−instance RenderSQL (ColumnExpression grp schemas params from column) where

394 renderSQL = \case

374 renderSQL = \case

395− DefaultAs col ->

396− renderSQL col <+> "=" <+> "DEFAULT"

375+ Default -> "DEFAULT"

397− Specific (expression `As` col) ->

376+ Set expr -> renderSQL expr

398− renderSQL col <+> "=" <+> renderSQL expression

399

377

400-- | A `ReturningClause` computes and return value(s) based

378-- | A `ReturningClause` computes and return value(s) based

401-- on each row actually inserted, updated or deleted. This is primarily

379-- on each row actually inserted, updated or deleted. This is primarily

@@ -405,19 +383,21 @@ instance RenderSQL (ColumnExpression grp schemas params from column) where

405-- deleted will be returned. For example, if a row was locked

383-- deleted will be returned. For example, if a row was locked

406-- but not updated because an `OnConflict` `DoUpdate` condition was not satisfied,

384-- but not updated because an `OnConflict` `DoUpdate` condition was not satisfied,

407-- the row will not be returned. `Returning` `Star` will return all columns

385-- the row will not be returned. `Returning` `Star` will return all columns

408−-- in the row. Use @Returning Nil@ in the common case where no return

386+-- in the row. Use `Returning` `Nil` in the common case where no return

409-- values are desired.

387-- values are desired.

410newtype ReturningClause commons schemas params from row =

388newtype ReturningClause commons schemas params from row =

411− Returning (Selection '[] 'Ungrouped commons schemas params from row)

389+ Returning (Selection '[] commons 'Ungrouped schemas params from row)

412

390

413instance RenderSQL (ReturningClause commons schemas params from row) where

391instance RenderSQL (ReturningClause commons schemas params from row) where

414 renderSQL = \case

392 renderSQL = \case

415 Returning (List Nil) -> ""

393 Returning (List Nil) -> ""

416 Returning selection -> " RETURNING" <+> renderSQL selection

394 Returning selection -> " RETURNING" <+> renderSQL selection

417

395

396+-- | `Returning` a `List`

418pattern Returning_

397pattern Returning_

419 :: SOP.SListI row

398 :: SOP.SListI row

420− => NP (Aliased (Expression '[] 'Ungrouped commons schemas params from)) row

399+ => NP (Aliased (Expression '[] commons 'Ungrouped schemas params from)) row

400+ -- ^ row of values

421 -> ReturningClause commons schemas params from row

401 -> ReturningClause commons schemas params from row

422pattern Returning_ list = Returning (List list)

402pattern Returning_ list = Returning (List list)

423

403

@@ -430,7 +410,9 @@ data ConflictClause tab commons schemas params table where

430 OnConflictDoRaise :: ConflictClause tab commons schemas params table

410 OnConflictDoRaise :: ConflictClause tab commons schemas params table

431 OnConflict

411 OnConflict

432 :: ConflictTarget constraints

412 :: ConflictTarget constraints

413+ -- ^ conflict target

433 -> ConflictAction tab commons schemas params columns

414 -> ConflictAction tab commons schemas params columns

415+ -- ^ conflict action

434 -> ConflictClause tab commons schemas params (constraints :=> columns)

416 -> ConflictClause tab commons schemas params (constraints :=> columns)

435

417

436-- | Render a `ConflictClause`.

418-- | Render a `ConflictClause`.

@@ -441,6 +423,17 @@ instance SOP.SListI (TableToColumns table)

441 OnConflict target action -> " ON CONFLICT"

423 OnConflict target action -> " ON CONFLICT"

442 <+> renderSQL target <+> renderSQL action

424 <+> renderSQL target <+> renderSQL action

443

425

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+-}

444data ConflictAction tab commons schemas params columns where

437data ConflictAction tab commons schemas params columns where

445 DoNothing :: ConflictAction tab commons schemas params columns

438 DoNothing :: ConflictAction tab commons schemas params columns

446 DoUpdate

439 DoUpdate

@@ -449,8 +442,9 @@ data ConflictAction tab commons schemas params columns where

449 , columns ~ (col0 ': cols)

442 , columns ~ (col0 ': cols)

450 , SOP.All (HasIn columns) subcolumns

443 , SOP.All (HasIn columns) subcolumns

451 , AllUnique subcolumns )

444 , AllUnique subcolumns )

452− => NP (ColumnExpression 'Ungrouped schemas params '[tab ::: row, "excluded" ::: row]) subcolumns

445+ => NP (Aliased (Optional (Expression '[] commons 'Ungrouped schemas params '[tab ::: row, "excluded" ::: row]))) subcolumns

453− -> [Condition '[] 'Ungrouped commons schemas params '[tab ::: row, "excluded" ::: row]]

446+ -> [Condition '[] commons 'Ungrouped schemas params '[tab ::: row, "excluded" ::: row]]

447+ -- ^ WHERE `Condition`s

454 -> ConflictAction tab commons schemas params columns

448 -> ConflictAction tab commons schemas params columns

455

449

456instance RenderSQL (ConflictAction tab commons schemas params columns) where

450instance RenderSQL (ConflictAction tab commons schemas params columns) where

@@ -458,11 +452,17 @@ instance RenderSQL (ConflictAction tab commons schemas params columns) where

458 DoNothing -> "DO NOTHING"

452 DoNothing -> "DO NOTHING"

459 DoUpdate updates whs'

453 DoUpdate updates whs'

460 -> "DO UPDATE SET"

454 -> "DO UPDATE SET"

461− <+> renderCommaSeparated renderSQL updates

455+ <+> renderCommaSeparated renderUpdate updates

462 <> case whs' of

456 <> case whs' of

463 [] -> ""

457 [] -> ""

464 wh:whs -> " WHERE" <+> renderSQL (foldr (.&&) wh whs)

458 wh:whs -> " WHERE" <+> renderSQL (foldr (.&&) wh whs)

465

459

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

467-- `ConflictAction`.

468data ConflictTarget constraints where

@@ -485,7 +485,6 @@ UPDATE statements

485update

486 :: ( SOP.SListI columns

487 , SOP.SListI row1

488− , db ~ (commons :=> schemas)

489 , Has sch schemas schema

488 , Has sch schemas schema

490 , Has tab schema ('Table table)

489 , Has tab schema ('Table table)

491 , row0 ~ TableToRow table

490 , row0 ~ TableToRow table

@@ -493,9 +492,9 @@ update

493 , SOP.All (HasIn columns) subcolumns

492 , SOP.All (HasIn columns) subcolumns

494 , AllUnique subcolumns )

493 , AllUnique subcolumns )

495 => QualifiedAlias sch tab -- ^ table to update

494 => QualifiedAlias sch tab -- ^ table to update

496− -> NP (ColumnExpression 'Ungrouped schemas params '[tab ::: row0]) subcolumns

495+ -> NP (Aliased (Optional (Expression '[] '[] 'Ungrouped schemas params '[tab ::: row0]))) subcolumns

497 -- ^ modified values to replace old values

496 -- ^ modified values to replace old values

498− -> Condition '[] 'Ungrouped commons schemas params '[tab ::: row0]

497+ -> Condition '[] commons 'Ungrouped schemas params '[tab ::: row0]

499 -- ^ condition under which to perform update on a row

498 -- ^ condition under which to perform update on a row

500 -> ReturningClause commons schemas params '[tab ::: row0] row1 -- ^ results to return

499 -> ReturningClause commons schemas params '[tab ::: row0] row1 -- ^ results to return

501 -> Manipulation commons schemas params row1

500 -> Manipulation commons schemas params row1

@@ -503,14 +502,13 @@ update tab columns wh returning = UnsafeManipulation $

503 "UPDATE"

502 "UPDATE"

504 <+> renderSQL tab

503 <+> renderSQL tab

505 <+> "SET"

504 <+> "SET"

506− <+> renderCommaSeparated renderSQL columns

505+ <+> renderCommaSeparated renderUpdate columns

507 <+> "WHERE" <+> renderSQL wh

506 <+> "WHERE" <+> renderSQL wh

508 <> renderSQL returning

507 <> renderSQL returning

509

508

510-- | Update a row returning `Nil`.

509-- | Update a row returning `Nil`.

511update_

510update_

512 :: ( SOP.SListI columns

511 :: ( SOP.SListI columns

513− , db ~ (commons :=> schemas)

514 , Has sch schemas schema

512 , Has sch schemas schema

515 , Has tab schema ('Table table)

513 , Has tab schema ('Table table)

516 , row ~ TableToRow table

514 , row ~ TableToRow table

@@ -518,9 +516,9 @@ update_

518 , SOP.All (HasIn columns) subcolumns

516 , SOP.All (HasIn columns) subcolumns

519 , AllUnique subcolumns )

517 , AllUnique subcolumns )

520 => QualifiedAlias sch tab -- ^ table to update

518 => QualifiedAlias sch tab -- ^ table to update

521− -> NP (ColumnExpression 'Ungrouped schemas params '[tab ::: row]) subcolumns

519+ -> NP (Aliased (Optional (Expression '[] '[] 'Ungrouped schemas params '[tab ::: row]))) subcolumns

522 -- ^ modified values to replace old values

520 -- ^ modified values to replace old values

523− -> Condition '[] 'Ungrouped commons schemas params '[tab ::: row]

521+ -> Condition '[] commons 'Ungrouped schemas params '[tab ::: row]

524 -- ^ condition under which to perform update on a row

522 -- ^ condition under which to perform update on a row

525 -> Manipulation commons schemas params '[]

523 -> Manipulation commons schemas params '[]

526update_ tab columns wh = update tab columns wh (Returning_ Nil)

524update_ tab columns wh = update tab columns wh (Returning_ Nil)

@@ -529,23 +527,32 @@ update_ tab columns wh = update tab columns wh (Returning_ Nil)

529DELETE statements

527DELETE statements

530-----------------------------------------}

528-----------------------------------------}

531

529

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.

532data UsingClause commons schemas params from where

539data UsingClause commons schemas params from where

533 NoUsing :: UsingClause commons schemas params '[]

540 NoUsing :: UsingClause commons schemas params '[]

534 Using

541 Using

535 :: FromClause '[] commons schemas params from

542 :: FromClause '[] commons schemas params from

543+ -- ^ what to use

536 -> UsingClause commons schemas params from

544 -> UsingClause commons schemas params from

537

545

538-- | Delete rows from a table.

546-- | Delete rows from a table.

539deleteFrom

547deleteFrom

540 :: ( SOP.SListI row1

548 :: ( SOP.SListI row1

541− , db ~ (commons :=> schemas)

542 , Has sch schemas schema

549 , Has sch schemas schema

543 , Has tab schema ('Table table)

550 , Has tab schema ('Table table)

544 , row0 ~ TableToRow table

551 , row0 ~ TableToRow table

545 , columns ~ TableToColumns table )

552 , columns ~ TableToColumns table )

546 => QualifiedAlias sch tab -- ^ table to delete from

553 => QualifiedAlias sch tab -- ^ table to delete from

547 -> UsingClause commons schemas params from

554 -> UsingClause commons schemas params from

548− -> Condition '[] 'Ungrouped commons schemas params (tab ::: row0 ': from)

555+ -> Condition '[] commons 'Ungrouped schemas params (tab ::: row0 ': from)

549 -- ^ condition under which to delete a row

556 -- ^ condition under which to delete a row

550 -> ReturningClause commons schemas params '[tab ::: row0] row1 -- ^ results to return

557 -> ReturningClause commons schemas params '[tab ::: row0] row1 -- ^ results to return

551 -> Manipulation commons schemas params row1

558 -> Manipulation commons schemas params row1

@@ -560,27 +567,12 @@ deleteFrom tab using wh returning = UnsafeManipulation $

560

567

561-- | Delete rows returning `Nil`.

568-- | Delete rows returning `Nil`.

562deleteFrom_

569deleteFrom_

563− :: ( db ~ (commons :=> schemas)

564− , Has sch schemas schema

570+ :: ( Has sch schemas schema

565 , Has tab schema ('Table table)

571 , Has tab schema ('Table table)

566 , row ~ TableToRow table

572 , row ~ TableToRow table

567 , columns ~ TableToColumns table )

573 , columns ~ TableToColumns table )

568 => QualifiedAlias sch tab -- ^ table to delete from

574 => QualifiedAlias sch tab -- ^ table to delete from

569− -> Condition '[] 'Ungrouped commons schemas params '[tab ::: row]

575+ -> Condition '[] commons 'Ungrouped schemas params '[tab ::: row]

570 -- ^ condition under which to delete a row

576 -- ^ condition under which to delete a row

571 -> Manipulation commons schemas params '[]

577 -> Manipulation commons schemas params '[]

572deleteFrom_ tab wh = deleteFrom tab NoUsing wh (Returning_ Nil)

578deleteFrom_ tab wh = deleteFrom tab NoUsing wh (Returning_ Nil)

573−

574−-- | This has the behaviour of a cartesian product, taking all

575−-- possible combinations between @left@ and @right@ - exactly like a

576−-- `crossJoin`. Used when no `crossJoin` syntax is required but simply

577−-- a comma separated list of tables. Typical case is the `UsingClause`

578−-- of a `deleteFrom` query.

579−also

580− :: FromClause outer commons schemas params right

581− -- ^ right

582− -> FromClause outer commons schemas params left

583− -- ^ left

584− -> FromClause outer commons schemas params (Join left right)

585−also right left = UnsafeFromClause $

586− renderSQL left <> "," <+> renderSQL right

squeal-postgresql/src/Squeal/PostgreSQL/Migration.hs+337−186

@@ -8,8 +8,13 @@ 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+

11>>> :set -XDataKinds -XOverloadedLabels

13>>> :set -XDataKinds -XOverloadedLabels

12>>> :set -XOverloadedStrings -XFlexibleContexts -XTypeOperators

14>>> :set -XOverloadedStrings -XFlexibleContexts -XTypeOperators

15+

16+Next, let's define our `TableType`s.

17+

13>>> :{

18>>> :{

14type UsersTable =

19type UsersTable =

15 '[ "pk_users" ::: 'PrimaryKey '["id"] ] :=>

20 '[ "pk_users" ::: 'PrimaryKey '["id"] ] :=>

@@ -20,7 +25,7 @@ type UsersTable =

21>>> :{

26>>> :{

22type EmailsTable =

27type EmailsTable =

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

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

24 , "fk_user_id" ::: 'ForeignKey '["user_id"] "users" '["id"]

29 , "fk_user_id" ::: 'ForeignKey '["user_id"] "users" '["id"]

25 ] :=>

30 ] :=>

26 '[ "id" ::: 'Def :=> 'NotNull 'PGint4

31 '[ "id" ::: 'Def :=> 'NotNull 'PGint4

@@ -29,227 +34,293 @@ type EmailsTable =

29 ]

34 ]

30:}

35:}

37+Now we can define some `Migration`s to make our tables.

38+

32>>> :{

39>>> :{

33let

40let

34− makeUsers :: Migration IO (Public '[]) '["public" ::: '["users" ::: 'Table UsersTable]]

41+ makeUsers :: Migration Definition (Public '[]) '["public" ::: '["users" ::: 'Table UsersTable]]

35 makeUsers = Migration

42 makeUsers = Migration

36 { name = "make users table"

43 { name = "make users table"

37− , up = void . define $

38− createTable #users

44+ , up = createTable #users

39 ( serial `as` #id :*

45 ( serial `as` #id :*

40− (text & notNullable) `as` #name )

46+ notNullable text `as` #name )

41 ( primaryKey #id `as` #pk_users )

47 ( primaryKey #id `as` #pk_users )

42− , down = void . define $ dropTable #users

48+ , down = dropTable #users

43 }

49 }

44:}

50:}

46>>> :{

52>>> :{

47let

53let

48− makeEmails :: Migration IO '["public" ::: '["users" ::: 'Table UsersTable]]

54+ makeEmails :: Migration Definition '["public" ::: '["users" ::: 'Table UsersTable]]

49 '["public" ::: '["users" ::: 'Table UsersTable, "emails" ::: 'Table EmailsTable]]

55 '["public" ::: '["users" ::: 'Table UsersTable, "emails" ::: 'Table EmailsTable]]

50 makeEmails = Migration

56 makeEmails = Migration

51 { name = "make emails table"

57 { name = "make emails table"

52− , up = void . define $

53− createTable #emails

58+ , up = createTable #emails

54 ( serial `as` #id :*

59 ( serial `as` #id :*

55− (int & notNullable) `as` #user_id :*

60+ notNullable int `as` #user_id :*

56− (text & nullable) `as` #email )

61+ nullable text `as` #email )

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

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

58 foreignKey #user_id #users #id

63 foreignKey #user_id #users #id

59 OnDeleteCascade OnUpdateCascade `as` #fk_user_id )

64 OnDeleteCascade OnUpdateCascade `as` #fk_user_id )

60− , down = void . define $ dropTable #emails

65+ , down = dropTable #emails

61 }

66 }

62:}

67:}

64−Now that we have a couple migrations we can chain them together.

69+Now that we have a couple migrations we can chain them together into a `Path`.

66>>> let migrations = makeUsers :>> makeEmails :>> Done

71>>> let migrations = makeUsers :>> makeEmails :>> Done

68−>>> :{

73+Now run the migrations.

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

79>>> :{

76>>> :{

80withConnection "host=localhost port=5432 dbname=exampledb" $

77withConnection "host=localhost port=5432 dbname=exampledb" $

81 manipulate (UnsafeManipulation "SET client_min_messages TO WARNING;")

78 manipulate (UnsafeManipulation "SET client_min_messages TO WARNING;")

82 -- suppress notices

79 -- suppress notices

80+ & pqThen (liftIO (putStrLn "Migrate"))

83 & pqThen (migrateUp migrations)

81 & pqThen (migrateUp migrations)

84− & pqThen numMigrations

82+ & pqThen (liftIO (putStrLn "Rollback"))

85 & pqThen (migrateDown migrations)

83 & pqThen (migrateDown migrations)

86− & pqThen numMigrations

87:}

84:}

88−Row 2

85+Migrate

89−Row 0

86+Rollback

87+

88+We can also create a simple executable using `defaultMain`.

89+

90+>>> let main = defaultMain "host=localhost port=5432 dbname=exampledb" migrations

91+

92+>>> withArgs [] main

93+Invalid command: "". Use:

94+migrate to run all available migrations

95+rollback to rollback all available migrations

96+status to display migrations run and migrations left to run

97+

98+>>> withArgs ["status"] main

99+Migrations already run:

100+ None

101+Migrations left to run:

102+ - make users table

103+ - make emails table

104+

105+>>> withArgs ["migrate"] main

106+Migrations already run:

107+ - make users table

108+ - make emails table

109+Migrations left to run:

110+ None

111+

112+>>> withArgs ["rollback"] main

113+Migrations already run:

114+ None

115+Migrations left to run:

116+ - make users table

117+ - make emails table

118+

119+In addition to enabling `Migration`s using pure SQL `Definition`s for

120+the `up` and `down` instructions, you can also perform impure `IO` actions

121+by using a `Migration`s over the `Terminally` `PQ` `IO` category.

90-}

122-}

123

92{-# LANGUAGE

124{-# LANGUAGE

93 DataKinds

125 DataKinds

126+ , DeriveGeneric

127+ , FlexibleContexts

128+ , FlexibleInstances

94 , GADTs

129 , GADTs

95 , LambdaCase

130 , LambdaCase

96− , PolyKinds

97 , OverloadedLabels

131 , OverloadedLabels

132+ , OverloadedStrings

133+ , PolyKinds

134+ , QuantifiedConstraints

135+ , RankNTypes

98 , TypeApplications

136 , TypeApplications

99− , FlexibleContexts

100 , TypeOperators

137 , TypeOperators

101#-}

138#-}

102

139

103module Squeal.PostgreSQL.Migration

140module Squeal.PostgreSQL.Migration

104 ( -- * Migration

141 ( -- * Migration

105 Migration (..)

142 Migration (..)

106− , migrateUp

143+ , Migratory (..)

107− , migrateDown

144+ , Terminally (..)

108− -- * Migration table

145+ , terminally

146+ , pureMigration

109 , MigrationsTable

147 , MigrationsTable

110− , createMigrations

148+ , defaultMain

111− , insertMigration

112− , deleteMigration

113− , selectMigration

114 ) where

149 ) where

115

150

151+import Control.Category

116import Control.Monad

152import Control.Monad

117−import Control.Monad.Base

153+import Data.ByteString (ByteString)

118−import Control.Monad.Trans.Control

154+import Data.Foldable (traverse_)

119−import Generics.SOP (K(..))

120import Data.Function ((&))

155import Data.Function ((&))

156+import Data.List ((\\))

121import Data.Text (Text)

157import Data.Text (Text)

158+import Data.Time (UTCTime)

159+import Prelude hiding ((.), id)

160+import System.Environment

161+import UnliftIO (MonadIO (..))

122

162

123−import Squeal.PostgreSQL

163+import qualified Data.Text.IO as Text (putStrLn)

164+import qualified Generics.SOP as SOP

165+import qualified GHC.Generics as GHC

124

166

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.

125−-- | A `Migration` should contain an inverse pair of

184+-- It should contain an inverse pair of `up` and `down`

126−-- `up` and `down` instructions and a unique `name`.

185+-- instructions and a unique `name`.

127−data Migration io schemas0 schemas1 = Migration

186+data Migration p schemas0 schemas1 = Migration

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

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

129 -- Each `name` in a `Migration` should be unique.

188 -- Each `name` in a `Migration` should be unique.

130− , up :: PQ schemas0 schemas1 io () -- ^ The `up` instruction of a `Migration`.

189+ , up :: p schemas0 schemas1 -- ^ The `up` instruction of a `Migration`.

131− , down :: PQ schemas1 schemas0 io () -- ^ The `down` instruction of a `Migration`.

190+ , down :: p schemas1 schemas0 -- ^ The `down` instruction of a `Migration`.

191+ } deriving (GHC.Generic)

192+

193+{- |

194+A `Migratory` @p@ is a `Category` for which one can execute or rewind

195+a `Path` of `Migration`s over @p@. This includes the category of pure

196+SQL `Definition`s and the category of impure `Terminally` `PQ` `IO` actions.

197+-}

198+class Category p => Migratory p where

199+

200+ {- |

201+ Run a `Path` of `Migration`s.

202+ Create the `MigrationsTable` as @public.schema_migrations@ if it does not already exist.

203+ In one transaction, for each each `Migration` query to see if the `Migration` has been executed;

204+ if not, `up` the `Migration` and insert its `name` in the `MigrationsTable`.

205+ -}

206+ migrateUp

207+ :: Path (Migration p) schemas0 schemas1

208+ -> PQ schemas0 schemas1 IO ()

209+

210+ {- |

211+ Rewind a `Path` of `Migration`s.

212+ Create the `MigrationsTable` as @public.schema_migrations@ if it does not already exist.

213+ In one transaction, for each each `Migration` query to see if the `Migration` has been executed;

214+ if so, `down` the `Migration` and delete its `name` in the `MigrationsTable`.

215+ -}

216+ migrateDown

217+ :: Path (Migration p) schemas0 schemas1

218+ -> PQ schemas1 schemas0 IO ()

219+

220+instance Migratory Definition where

221+ migrateUp = migrateUp . cmap pureMigration

222+ migrateDown = migrateDown . cmap pureMigration

223+

224+{- | `Terminally` turns an indexed monad transformer and the monad it transforms

225+into a category by restricting the return type to @()@ and permuting the type variables.

226+This is similar to how applying a monad to @()@ yields a monoid.

227+Since a `Terminally` action has a trivial return value, the only reason

228+to run one is for the side effects, in particular database and other IO effects.

229+-}

230+newtype Terminally trans monad x0 x1 = Terminally

231+ { runTerminally :: trans x0 x1 monad () }

232+ deriving GHC.Generic

233+

234+instance

235+ ( IndexedMonadTransPQ trans

236+ , Monad monad

237+ , forall x0 x1. x0 ~ x1 => Monad (trans x0 x1 monad) )

238+ => Category (Terminally trans monad) where

239+ id = Terminally (return ())

240+ Terminally g . Terminally f = Terminally $ pqThen g f

241+

242+-- | `terminally` ignores the output of a computation, returning @()@ and

243+-- wrapping it up into a `Terminally`. You can lift an action in the base monad

244+-- by using @terminally . lift@.

245+terminally

246+ :: Functor (trans x0 x1 monad)

247+ => trans x0 x1 monad ignore

248+ -> Terminally trans monad x0 x1

249+terminally = Terminally . void

250+

251+-- | A `pureMigration` turns a `Migration` involving only pure SQL

252+-- `Definition`s into a `Migration` that may be combined with arbitrary `IO`.

253+pureMigration

254+ :: Migration Definition schemas0 schemas1

255+ -> Migration (Terminally PQ IO) schemas0 schemas1

256+pureMigration migration = Migration

257+ { name = name migration

258+ , up = terminally . define $ up migration

259+ , down = terminally . define $ down migration

132 }

260 }

133

261

134−-- | Run `Migration`s by creating the `MigrationsTable`

262+instance Migratory (Terminally PQ IO) where

135−-- if it does not exist and then in a transaction, for each each `Migration`

136−-- query to see if the `Migration` is executed. If not, then

137−-- execute the `Migration` and insert its row in the `MigrationsTable`.

138−migrateUp

139− :: MonadBaseControl IO io

140− => AlignedList (Migration io) schemas0 schemas1 -- ^ migrations to run

141− -> PQ

142− ("migrations" ::: MigrationsSchema ': schemas0)

143− ("migrations" ::: MigrationsSchema ': schemas1)

144− io ()

145−migrateUp migration =

146− define createMigrations

147− & pqBind okResult

148− & pqThen (transactionallySchema_ (upMigrations migration))

149− where

150

263

151− upMigrations

264+ migrateUp migration = unsafePQ . transactionally_ $ do

152− :: MonadBaseControl IO io

265+ define createMigrations

153− => AlignedList (Migration io) schemas0 schemas1

266+ upMigrations migration

154− -> PQ

267+

155− ("migrations" ::: MigrationsSchema ': schemas0)

268+ where

156− ("migrations" ::: MigrationsSchema ': schemas1)

269+

157− io ()

270+ upMigrations

271+ :: Path (Migration (Terminally PQ IO)) schemas0 schemas1

272+ -> PQ MigrationsSchemas MigrationsSchemas IO ()

158− upMigrations = \case

273+ upMigrations = \case

159− Done -> return ()

274+ Done -> return ()

160− step :>> steps -> upMigration step & pqThen (upMigrations steps)

275+ step :>> steps -> upMigration step >> upMigrations steps

161−

276+

162− upMigration

277+ upMigration

163− :: MonadBase IO io

164− => Migration io schemas0 schemas1 -> PQ

278+ :: Migration (Terminally PQ IO) schemas0 schemas1

165− ("migrations" ::: MigrationsSchema ': schemas0)

279+ -> PQ MigrationsSchemas MigrationsSchemas IO ()

166− ("migrations" ::: MigrationsSchema ': schemas1)

167− io ()

168− upMigration step =

280+ upMigration step = do

169− queryExecuted step

281+ executed <- queryExecuted step

170− & pqBind (\ executed ->

282+ unless (executed == 1) $ do

171− if executed == 1 -- up step has already been executed

283+ unsafePQ . runTerminally $ up step

172− then PQ (\ _ -> return (K ())) -- unsafely switch schemas

173− else

174− pqEmbed (up step) -- safely switch schemas

175− & pqThen (manipulateParams insertMigration (Only (name step)))

284+ manipulateParams_ insertMigration (Only (name step))

176− -- insert execution record

285+

177− & pqBind okResult)

178−

179− queryExecuted

286+ queryExecuted

180− :: MonadBase IO io

287+ :: Migration (Terminally PQ IO) schemas0 schemas1

181− => Migration io schemas0 schemas1 -> PQ

288+ -> PQ MigrationsSchemas MigrationsSchemas IO Row

182− ("migrations" ::: MigrationsSchema ': schemas0)

183− ("migrations" ::: MigrationsSchema ': schemas0)

184− io Row

185− queryExecuted step = do

289+ queryExecuted step = do

186− result <- runQueryParams selectMigration (Only (name step))

290+ result <- runQueryParams selectMigration (Only (name step))

187− okResult result

188− ntuples result

291+ 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

206

292

207− downMigrations

293+ migrateDown migrations = unsafePQ . transactionally_ $ do

208− :: MonadBaseControl IO io

294+ define createMigrations

209− => AlignedList (Migration io) schemas0 schemas1 -> PQ

295+ downMigrations migrations

210− ("migrations" ::: MigrationsSchema ': schemas1)

296+

211− ("migrations" ::: MigrationsSchema ': schemas0)

297+ where

212− io ()

298+

299+ downMigrations

300+ :: Path (Migration (Terminally PQ IO)) schemas0 schemas1

301+ -> PQ MigrationsSchemas MigrationsSchemas IO ()

213− downMigrations = \case

302+ downMigrations = \case

214− Done -> return ()

303+ Done -> return ()

215− step :>> steps -> downMigrations steps & pqThen (downMigration step)

304+ step :>> steps -> downMigrations steps >> downMigration step

216−

305+

217− downMigration

306+ downMigration

218− :: MonadBase IO io

307+ :: Migration (Terminally PQ IO) schemas0 schemas1

219− => Migration io schemas0 schemas1 -> PQ

308+ -> PQ MigrationsSchemas MigrationsSchemas IO ()

220− ("migrations" ::: MigrationsSchema ': schemas1)

221− ("migrations" ::: MigrationsSchema ': schemas0)

222− io ()

223− downMigration step =

309+ downMigration step = do

224− queryExecuted step

310+ executed <- queryExecuted step

225− & pqBind (\ executed ->

311+ unless (executed == 0) $ do

226− if executed == 0 -- up step has not been executed

312+ unsafePQ . runTerminally $ down step

227− then PQ (\ _ -> return (K ())) -- unsafely switch schemas

228− else

229− pqEmbed (down step) -- safely switch schemas

230− & pqThen (manipulateParams deleteMigration (Only (name step)))

313+ manipulateParams_ deleteMigration (Only (name step))

231− -- delete execution record

314+

232− & pqBind okResult)

233−

234− queryExecuted

315+ queryExecuted

235− :: MonadBase IO io

316+ :: Migration (Terminally PQ IO) schemas0 schemas1

236− => Migration io schemas0 schemas1 -> PQ

317+ -> PQ MigrationsSchemas MigrationsSchemas IO Row

237− ("migrations" ::: MigrationsSchema ': schemas1)

238− ("migrations" ::: MigrationsSchema ': schemas1)

239− io Row

240− queryExecuted step = do

318+ queryExecuted step = do

241− result <- runQueryParams selectMigration (Only (name step))

319+ result <- runQueryParams selectMigration (Only (name step))

242− okResult result

243− ntuples result

320+ ntuples result

244−

321+

245−okResult :: MonadBase IO io => K Result results -> PQ schema schema io ()

322+unsafePQ :: (Functor m) => PQ db0 db1 m x -> PQ db0' db1' m x

246−okResult result = do

323+unsafePQ (PQ pq) = PQ $ fmap (SOP.K . SOP.unK) . pq . SOP.K . SOP.unK

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)

253

324

254-- | The `TableType` for a Squeal migration.

325-- | The `TableType` for a Squeal migration.

255type MigrationsTable =

326type MigrationsTable =

@@ -258,40 +329,120 @@ type MigrationsTable =

258 , "executed_at" ::: 'Def :=> 'NotNull 'PGtimestamptz

329 , "executed_at" ::: 'Def :=> 'NotNull 'PGtimestamptz

259 ]

330 ]

260

331

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+

261type MigrationsSchema = '["schema_migrations" ::: 'Table MigrationsTable]

340type MigrationsSchema = '["schema_migrations" ::: 'Table MigrationsTable]

341+type MigrationsSchemas = Public MigrationsSchema

262

342

263-- | Creates a `MigrationsTable` if it does not already exist.

343-- | Creates a `MigrationsTable` if it does not already exist.

264−createMigrations

344+createMigrations :: Definition MigrationsSchemas MigrationsSchemas

265− :: Has "migrations" schemas MigrationsSchema

266− => Definition schemas schemas

267createMigrations =

345createMigrations =

268− createSchemaIfNotExists #migrations >>>

269− createTableIfNotExists (#migrations ! #schema_migrations)

346+ createTableIfNotExists #schema_migrations

270 ( (text & notNullable) `as` #name :*

347 ( (text & notNullable) `as` #name :*

271 (timestampWithTimeZone & notNullable & default_ currentTimestamp)

348 (timestampWithTimeZone & notNullable & default_ currentTimestamp)

272 `as` #executed_at )

349 `as` #executed_at )

273 ( unique #name `as` #migrations_unique_name )

350 ( unique #name `as` #migrations_unique_name )

274

351

275−-- | Inserts a `Migration` into the `MigrationsTable`

352+-- | Inserts a `Migration` into the `MigrationsTable`, returning

276−insertMigration

353+-- the time at which it was inserted.

277− :: Has "migrations" schemas MigrationsSchema

354+insertMigration :: Manipulation_ MigrationsSchemas (Only Text) ()

278− => Manipulation '[] schemas '[ 'NotNull 'PGtext] '[]

279−insertMigration = insertInto_ (#migrations ! #schema_migrations) . Values_ $

355+insertMigration = insertInto_ #schema_migrations

280− (param @1) `as` #name :* defaultAs #executed_at

356+ (Values_ (Set (param @1) `as` #name :* Default `as` #executed_at))

281

357

282−-- | Deletes a `Migration` from the `MigrationsTable`

358+-- | Deletes a `Migration` from the `MigrationsTable`, returning

283−deleteMigration

359+-- the time at which it was inserted.

284− :: Has "migrations" schemas MigrationsSchema

360+deleteMigration :: Manipulation_ MigrationsSchemas (Only Text) ()

285− => Manipulation '[] schemas '[ 'NotNull 'PGtext ] '[]

286−deleteMigration = deleteFrom_ (#migrations ! #schema_migrations) (#name .== param @1)

361+deleteMigration = deleteFrom_ #schema_migrations (#name .== param @1)

287

362

288-- | Selects a `Migration` from the `MigrationsTable`, returning

363-- | Selects a `Migration` from the `MigrationsTable`, returning

289−-- the time at which it was executed.

364+-- the time at which it was inserted.

290selectMigration

365selectMigration

291− :: Has "migrations" schemas MigrationsSchema

366+ :: Query_ MigrationsSchemas (Only Text) (Only UTCTime)

292− => Query '[] '[] schemas '[ 'NotNull 'PGtext ]

293− '[ "executed_at" ::: 'NotNull 'PGtimestamptz ]

294−selectMigration = select_

367+selectMigration = select_ (#executed_at `as` #fromOnly)

295− (#executed_at `as` #executed_at)

296− ( from (table ((#migrations ! #schema_migrations) `as` #m))

368+ $ from (table (#schema_migrations))

297− & where_ (#name .== param @1))

369+ & where_ (#name .== param @1)

370+

371+selectMigrations :: Query_ MigrationsSchemas () MigrationRow

372+selectMigrations = select_

373+ (#name `as` #migrationName :* #executed_at `as` #migrationTime)

374+ (from (table #schema_migrations))

375+

376+data MigrateCommand

377+ = MigrateStatus

378+ | MigrateUp

379+ | MigrateDown deriving (GHC.Generic, Show)

380+

381+{- | `defaultMain` creates a simple executable

382+from a connection string and a list of `Migration`s. -}

383+defaultMain

384+ :: Migratory p

385+ => ByteString

386+ -- ^ connection string

387+ -> Path (Migration p) db0 db1

388+ -- ^ migrations

389+ -> IO ()

390+defaultMain connectTo migrations = do

391+ command <- readCommandFromArgs

392+ maybe (pure ()) performCommand command

393+

394+ where

395+

396+ performCommand :: MigrateCommand -> IO ()

397+ performCommand = \case

398+ MigrateStatus -> withConnection connectTo $

399+ suppressNotices >> migrateStatus

400+ MigrateUp -> withConnection connectTo $

401+ suppressNotices & pqThen (migrateUp migrations) & pqThen migrateStatus

402+ MigrateDown -> withConnection connectTo $

403+ suppressNotices & pqThen (migrateDown migrations) & pqThen migrateStatus

404+

405+ migrateStatus :: PQ schema schema IO ()

406+ migrateStatus = unsafePQ $ do

407+ runNames <- getRunMigrationNames

408+ let names = ctoList name migrations

409+ unrunNames = names \\ runNames

410+ liftIO $ displayRunned runNames >> displayUnrunned unrunNames

411+

412+ suppressNotices :: PQ schema schema IO ()

413+ suppressNotices = manipulate_ $

414+ UnsafeManipulation "SET client_min_messages TO WARNING;"

415+

416+ readCommandFromArgs :: IO (Maybe MigrateCommand)

417+ readCommandFromArgs = getArgs >>= \case

418+ ["migrate"] -> pure . Just $ MigrateUp

419+ ["rollback"] -> pure . Just $ MigrateDown

420+ ["status"] -> pure . Just $ MigrateStatus

421+ args -> displayUsage args >> pure Nothing

422+

423+ displayUsage :: [String] -> IO ()

424+ displayUsage args = do

425+ putStrLn $ "Invalid command: \"" <> unwords args <> "\". Use:"

426+ putStrLn "migrate to run all available migrations"

427+ putStrLn "rollback to rollback all available migrations"

428+ putStrLn "status to display migrations run and migrations left to run"

429+

430+ getRunMigrationNames :: (MonadIO m) => PQ db0 db0 m [Text]

431+ getRunMigrationNames =

432+ fmap migrationName <$> (unsafePQ (define createMigrations & pqThen (runQuery selectMigrations)) >>= getRows)

433+

434+ displayListOfNames :: [Text] -> IO ()

435+ displayListOfNames [] = Text.putStrLn " None"

436+ displayListOfNames xs =

437+ let singleName n = Text.putStrLn $ " - " <> n

438+ in traverse_ singleName xs

439+

440+ displayUnrunned :: [Text] -> IO ()

441+ displayUnrunned unrunned =

442+ Text.putStrLn "Migrations left to run:"

443+ >> displayListOfNames unrunned

444+

445+ displayRunned :: [Text] -> IO ()

446+ displayRunned runned =

447+ Text.putStrLn "Migrations already run:"

448+ >> displayListOfNames runned

squeal-postgresql/src/Squeal/PostgreSQL/PG.hsnew file+388

@@ -0,0 +1,388 @@

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

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+138−103

@@ -24,6 +24,7 @@ of executing Squeal commands.

24 , FunctionalDependencies

25 , FlexibleContexts

26 , FlexibleInstances

27+ , InstanceSigs

27 , OverloadedStrings

28 , OverloadedStrings

28 , RankNTypes

29 , RankNTypes

29 , ScopedTypeVariables

30 , ScopedTypeVariables

@@ -48,8 +49,6 @@ module Squeal.PostgreSQL.PQ

48 , evalPQ

49 , evalPQ

49 , IndexedMonadTransPQ (..)

50 , IndexedMonadTransPQ (..)

50 , MonadPQ (..)

51 , MonadPQ (..)

51− , PQRun

52− , pqliftWith

53 -- * Results

52 -- * Results

54 , LibPQ.Result

53 , LibPQ.Result

55 , LibPQ.Row

54 , LibPQ.Row

@@ -65,18 +64,21 @@ module Squeal.PostgreSQL.PQ

65 , resultErrorCode

64 , resultErrorCode

66 -- * Exceptions

65 -- * Exceptions

67 , SquealException (..)

66 , SquealException (..)

67+ , PQState (..)

68+ , okResult

68 , catchSqueal

69 , catchSqueal

69 , handleSqueal

70 , handleSqueal

71+ , trySqueal

70 ) where

72 ) where

72−import Control.Exception.Lifted

74+import Control.Exception (Exception, throw)

73−import Control.Monad.Base

74import Control.Monad.Except

75import Control.Monad.Except

75import Control.Monad.Morph

76import Control.Monad.Morph

76−import Control.Monad.Trans.Control

77+import UnliftIO (MonadUnliftIO (..), bracket, catch, handle, try)

77import Data.ByteString (ByteString)

78import Data.ByteString (ByteString)

78import Data.Foldable

79import Data.Foldable

79import Data.Function ((&))

80import Data.Function ((&))

81+import Data.Functor ((<&>))

80import Data.Kind

82import Data.Kind

81import Data.Text (pack, Text)

83import Data.Text (pack, Text)

82import Data.Traversable

84import Data.Traversable

@@ -85,6 +87,7 @@ import PostgreSQL.Binary.Encoding (encodingBytes)

86import qualified Control.Monad.Fail as Fail

88import qualified Control.Monad.Fail as Fail

87import qualified Database.PostgreSQL.LibPQ as LibPQ

89import qualified Database.PostgreSQL.LibPQ as LibPQ

90+import qualified PostgreSQL.Binary.Encoding as Encoding

89import Squeal.PostgreSQL.Binary

92import Squeal.PostgreSQL.Binary

90import Squeal.PostgreSQL.Definition

93import Squeal.PostgreSQL.Definition

@@ -105,6 +108,9 @@ import qualified Control.Monad.Trans.Writer.Strict as Strict

105import qualified Control.Monad.Trans.RWS.Lazy as Lazy

108import qualified Control.Monad.Trans.RWS.Lazy as Lazy

106import qualified Control.Monad.Trans.RWS.Strict as Strict

109import qualified Control.Monad.Trans.RWS.Strict as Strict

107

110

111+-- $setup

112+-- >>> import Squeal.PostgreSQL

113+

108{- | Makes a new connection to the database server.

114{- | Makes a new connection to the database server.

109

115

110This function opens a new database connection using the parameters taken

116This function opens a new database connection using the parameters taken

@@ -132,19 +138,19 @@ with the wrong schema!

132-}

138-}

133connectdb

139connectdb

134 :: forall schemas io

140 :: forall schemas io

135− . MonadBase IO io

141+ . MonadIO io

136 => ByteString -- ^ conninfo

142 => ByteString -- ^ conninfo

137 -> io (K LibPQ.Connection schemas)

143 -> io (K LibPQ.Connection schemas)

138−connectdb = fmap K . liftBase . LibPQ.connectdb

144+connectdb = fmap K . liftIO . LibPQ.connectdb

139

145

140-- | Closes the connection to the server.

146-- | Closes the connection to the server.

141−finish :: MonadBase IO io => K LibPQ.Connection schemas -> io ()

147+finish :: MonadIO io => K LibPQ.Connection schemas -> io ()

142−finish = liftBase . LibPQ.finish . unK

148+finish = liftIO . LibPQ.finish . unK

143

149

144-- | Do `connectdb` and `finish` before and after a computation.

150-- | Do `connectdb` and `finish` before and after a computation.

145withConnection

151withConnection

146 :: forall schemas0 schemas1 io x

152 :: forall schemas0 schemas1 io x

147− . MonadBaseControl IO io

153+ . MonadUnliftIO io

148 => ByteString

154 => ByteString

149 -> PQ schemas0 schemas1 io x

155 -> PQ schemas0 schemas1 io x

150 -> io x

156 -> io x

@@ -202,8 +208,7 @@ evalPQ (PQ pq) conn = unK <$> pq conn

202-- [enriched category](https://ncatlab.org/nlab/show/enriched+category).

208-- [enriched category](https://ncatlab.org/nlab/show/enriched+category).

203-- An indexed monad transformer transforms a `Monad` into an indexed monad.

209-- An indexed monad transformer transforms a `Monad` into an indexed monad.

204-- And, `IndexedMonadTransPQ` is a class for indexed monad transformers that

210-- And, `IndexedMonadTransPQ` is a class for indexed monad transformers that

205−-- support running `Definition`s using `define` and embedding a computation

211+-- support running `Definition`s using `define`.

206−-- in a larger schema using `pqEmbed`.

207class IndexedMonadTransPQ pq where

212class IndexedMonadTransPQ pq where

208

213

209 -- | indexed analog of `<*>`

214 -- | indexed analog of `<*>`

@@ -243,19 +248,16 @@ class IndexedMonadTransPQ pq where

243 -> x -> pq schemas0 schemas2 m z

248 -> x -> pq schemas0 schemas2 m z

244 pqAndThen g f x = pqBind g (f x)

249 pqAndThen g f x = pqBind g (f x)

245

250

246− -- | Safely embed a computation in a larger schema.

247− pqEmbed

248− :: Monad m

249− => pq schemas0 schemas1 m x

250− -> pq (schema ': schemas0) (schema : schemas1) m x

251−

252− -- | Run a `Definition` with `LibPQ.exec`, we expect that libpq obeys the law

251+ -- | Run a `Definition` with `LibPQ.exec`.

252+ --

253+ -- It should be functorial in effect.

253 --

254 --

255+ -- @define id = return ()@

254− -- @define statement1 & pqThen (define statement2) = define (statement1 >>> statement2)@

256+ -- @define (statement1 >>> statement2) = define statement1 & pqThen (define statement2)@

255 define

257 define

256− :: MonadBase IO io

258+ :: MonadIO io

257 => Definition schemas0 schemas1

259 => Definition schemas0 schemas1

258− -> pq schemas0 schemas1 io (K LibPQ.Result '[])

260+ -> pq schemas0 schemas1 io ()

259

261

260instance IndexedMonadTransPQ PQ where

262instance IndexedMonadTransPQ PQ where

261

263

@@ -268,16 +270,12 @@ instance IndexedMonadTransPQ PQ where

268 K x' <- x conn

270 K x' <- x conn

269 unPQ (f x') (K (unK conn))

271 unPQ (f x') (K (unK conn))

270

272

271− pqEmbed (PQ pq) = PQ $ \ (K conn) -> do

272− K x <- pq (K conn)

273− return $ K x

274−

275 define (UnsafeDefinition q) = PQ $ \ (K conn) -> do

273 define (UnsafeDefinition q) = PQ $ \ (K conn) -> do

276− resultMaybe <- liftBase $ LibPQ.exec conn q

274+ resultMaybe <- liftIO $ LibPQ.exec conn q

277 case resultMaybe of

275 case resultMaybe of

278 Nothing -> throw $ ResultException

276 Nothing -> throw $ ResultException

279 "define: LibPQ.exec returned no results"

277 "define: LibPQ.exec returned no results"

280− Just result -> return $ K (K result)

278+ Just result -> K <$> okResult_ result

281

279

282{- | `MonadPQ` is an @mtl@ style constraint, similar to

280{- | `MonadPQ` is an @mtl@ style constraint, similar to

283`Control.Monad.State.Class.MonadState`, for using `Database.PostgreSQL.LibPQ` to

281`Control.Monad.State.Class.MonadState`, for using `Database.PostgreSQL.LibPQ` to

@@ -286,8 +284,12 @@ instance IndexedMonadTransPQ PQ where

286 with a `ToParams` constraint. It calls `LibPQ.execParams` and

284 with a `ToParams` constraint. It calls `LibPQ.execParams` and

287 doesn't afraid of anything.

285 doesn't afraid of anything.

288

286

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+

291* `runQueryParams` is like `manipulateParams` for query statements.

293* `runQueryParams` is like `manipulateParams` for query statements.

292

294

293* `runQuery` is like `runQueryParams` for a parameter-free statement.

295* `runQuery` is like `runQueryParams` for a parameter-free statement.

@@ -301,7 +303,7 @@ instance IndexedMonadTransPQ PQ where

301* `forPrepared` is a flipped `traversePrepared`

303* `forPrepared` is a flipped `traversePrepared`

302

304

303* `traversePrepared_` is like `traversePrepared` but works on `Foldable`

305* `traversePrepared_` is like `traversePrepared` but works on `Foldable`

304− containers and returns unit.

306+ containers for a returning-free statement.

305

307

306* `forPrepared_` is a flipped `traversePrepared_`.

308* `forPrepared_` is a flipped `traversePrepared_`.

307

309

@@ -315,24 +317,34 @@ a default instance.

315-}

317-}

316class Monad pq => MonadPQ schemas pq | pq -> schemas where

318class Monad pq => MonadPQ schemas pq | pq -> schemas where

317 manipulateParams

319 manipulateParams

318− :: ToParams x params

320+ :: (ToParams x params, All OidOfParam params)

319 => Manipulation '[] schemas params ys

321 => Manipulation '[] schemas params ys

320 -- ^ `insertInto`, `update` or `deleteFrom`

322 -- ^ `insertInto`, `update` or `deleteFrom`

321 -> x -> pq (K LibPQ.Result ys)

323 -> x -> pq (K LibPQ.Result ys)

322 default manipulateParams

324 default manipulateParams

323 :: (MonadTrans t, MonadPQ schemas pq1, pq ~ t pq1)

325 :: (MonadTrans t, MonadPQ schemas pq1, pq ~ t pq1)

324− => ToParams x params

326+ => (ToParams x params, All OidOfParam params)

325 => Manipulation '[] schemas params ys

327 => Manipulation '[] schemas params ys

326 -- ^ `insertInto`, `update` or `deleteFrom`

328 -- ^ `insertInto`, `update` or `deleteFrom`

327 -> x -> pq (K LibPQ.Result ys)

329 -> x -> pq (K LibPQ.Result ys)

328 manipulateParams manipulation params = lift $

330 manipulateParams manipulation params = lift $

329 manipulateParams manipulation params

331 manipulateParams manipulation params

330

332

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+

331 manipulate :: Manipulation '[] schemas '[] ys -> pq (K LibPQ.Result ys)

340 manipulate :: Manipulation '[] schemas '[] ys -> pq (K LibPQ.Result ys)

332 manipulate statement = manipulateParams statement ()

341 manipulate statement = manipulateParams statement ()

333

342

343+ manipulate_ :: Manipulation '[] schemas '[] '[] -> pq ()

344+ manipulate_ = void . manipulate

345+

334 runQueryParams

346 runQueryParams

335− :: ToParams x params

347+ :: (ToParams x params, All OidOfParam params)

336 => Query '[] '[] schemas params ys

348 => Query '[] '[] schemas params ys

337 -- ^ `select` and friends

349 -- ^ `select` and friends

338 -> x -> pq (K LibPQ.Result ys)

350 -> x -> pq (K LibPQ.Result ys)

@@ -345,19 +357,19 @@ class Monad pq => MonadPQ schemas pq | pq -> schemas where

345 runQuery q = runQueryParams q ()

357 runQuery q = runQueryParams q ()

346

358

347 traversePrepared

359 traversePrepared

348− :: (ToParams x params, Traversable list)

360+ :: (ToParams x params, Traversable list, All OidOfParam params)

349 => Manipulation '[] schemas params ys

361 => Manipulation '[] schemas params ys

350 -- ^ `insertInto`, `update`, or `deleteFrom`, and friends

362 -- ^ `insertInto`, `update`, or `deleteFrom`, and friends

351 -> list x -> pq (list (K LibPQ.Result ys))

363 -> list x -> pq (list (K LibPQ.Result ys))

352 default traversePrepared

364 default traversePrepared

353 :: (MonadTrans t, MonadPQ schemas pq1, pq ~ t pq1)

365 :: (MonadTrans t, MonadPQ schemas pq1, pq ~ t pq1)

354− => (ToParams x params, Traversable list)

366+ => (ToParams x params, Traversable list, All OidOfParam params)

355 => Manipulation '[] schemas params ys -> list x -> pq (list (K LibPQ.Result ys))

367 => Manipulation '[] schemas params ys -> list x -> pq (list (K LibPQ.Result ys))

356 traversePrepared manipulation params = lift $

368 traversePrepared manipulation params = lift $

357 traversePrepared manipulation params

369 traversePrepared manipulation params

358

370

359 forPrepared

371 forPrepared

360− :: (ToParams x params, Traversable list)

372+ :: (ToParams x params, Traversable list, All OidOfParam params)

361 => list x

373 => list x

362 -> Manipulation '[] schemas params ys

374 -> Manipulation '[] schemas params ys

363 -- ^ `insertInto`, `update` or `deleteFrom`

375 -- ^ `insertInto`, `update` or `deleteFrom`

@@ -365,13 +377,13 @@ class Monad pq => MonadPQ schemas pq | pq -> schemas where

365 forPrepared = flip traversePrepared

377 forPrepared = flip traversePrepared

366

378

367 traversePrepared_

379 traversePrepared_

368− :: (ToParams x params, Foldable list)

380+ :: (ToParams x params, Foldable list, All OidOfParam params)

369 => Manipulation '[] schemas params '[]

381 => Manipulation '[] schemas params '[]

370 -- ^ `insertInto`, `update` or `deleteFrom`

382 -- ^ `insertInto`, `update` or `deleteFrom`

371 -> list x -> pq ()

383 -> list x -> pq ()

372 default traversePrepared_

384 default traversePrepared_

373 :: (MonadTrans t, MonadPQ schemas pq1, pq ~ t pq1)

385 :: (MonadTrans t, MonadPQ schemas pq1, pq ~ t pq1)

374− => (ToParams x params, Foldable list)

386+ => (ToParams x params, Foldable list, All OidOfParam params)

375 => Manipulation '[] schemas params '[]

387 => Manipulation '[] schemas params '[]

376 -- ^ `insertInto`, `update` or `deleteFrom`

388 -- ^ `insertInto`, `update` or `deleteFrom`

377 -> list x -> pq ()

389 -> list x -> pq ()

@@ -379,7 +391,7 @@ class Monad pq => MonadPQ schemas pq | pq -> schemas where

379 traversePrepared_ manipulation params

391 traversePrepared_ manipulation params

380

392

381 forPrepared_

393 forPrepared_

382− :: (ToParams x params, Foldable list)

394+ :: (ToParams x params, Foldable list, All OidOfParam params)

383 => list x

395 => list x

384 -> Manipulation '[] schemas params '[]

396 -> Manipulation '[] schemas params '[]

385 -- ^ `insertInto`, `update` or `deleteFrom`

397 -- ^ `insertInto`, `update` or `deleteFrom`

@@ -392,61 +404,83 @@ class Monad pq => MonadPQ schemas pq | pq -> schemas where

392 => (LibPQ.Connection -> IO a) -> pq a

404 => (LibPQ.Connection -> IO a) -> pq a

393 liftPQ = lift . liftPQ

405 liftPQ = lift . liftPQ

394

406

395−instance (MonadBase IO io, schemas0 ~ schemas, schemas1 ~ schemas)

407+instance (MonadIO io, schemas0 ~ schemas, schemas1 ~ schemas)

396 => MonadPQ schemas (PQ schemas0 schemas1 io) where

408 => MonadPQ schemas (PQ schemas0 schemas1 io) where

397

409

398 manipulateParams

410 manipulateParams

399 (UnsafeManipulation q :: Manipulation '[] schemas ps ys) (params :: x) =

411 (UnsafeManipulation q :: Manipulation '[] schemas ps ys) (params :: x) =

400 PQ $ \ (K conn) -> do

412 PQ $ \ (K conn) -> do

401 let

413 let

402− toParam' encoding =

414+ paramSet

415+ :: forall param. OidOfParam param

416+ => K (Maybe Encoding.Encoding) param

417+ -> K (Maybe (LibPQ.Oid, ByteString, LibPQ.Format)) param

418+ paramSet (K maybeEncoding) = K $

419+ maybeEncoding <&> \encoding ->

403− (LibPQ.invalidOid, encodingBytes encoding, LibPQ.Binary)

420+ (oidOfParam @param, encodingBytes encoding, LibPQ.Binary)

421+ params'

422+ = hcollapse

423+ . hcmap (Proxy @OidOfParam) paramSet

404− params' = fmap (fmap toParam') (hcollapse (toParams @x @ps params))

424+ $ toParams @x @ps params

405 q' = q <> ";"

425 q' = q <> ";"

406− resultMaybe <- liftBase $ LibPQ.execParams conn q' params' LibPQ.Binary

426+ resultMaybe <- liftIO $ LibPQ.execParams conn q' params' LibPQ.Binary

407 case resultMaybe of

427 case resultMaybe of

408 Nothing -> throw $ ResultException

428 Nothing -> throw $ ResultException

409 "manipulateParams: LibPQ.execParams returned no results"

429 "manipulateParams: LibPQ.execParams returned no results"

410 Just result -> do

430 Just result -> do

411− tryResult result

431+ okResult_ result

412 return $ K (K result)

432 return $ K (K result)

413

433

414 traversePrepared

434 traversePrepared

415 (UnsafeManipulation q :: Manipulation '[] schemas xs ys) (list :: list x) =

435 (UnsafeManipulation q :: Manipulation '[] schemas xs ys) (list :: list x) =

416− PQ $ \ (K conn) -> liftBase $ do

436+ PQ $ \ (K conn) -> liftIO $ do

437+ let

417− let temp = "temporary_statement"

438+ temp = "temporary_statement"

439+ paramOid :: forall p. OidOfParam p => K LibPQ.Oid p

440+ paramOid = K (oidOfParam @p)

441+ paramOids :: NP (K LibPQ.Oid) xs

442+ paramOids = hcpure (Proxy @OidOfParam) paramOid

443+ paramOids' :: [LibPQ.Oid]

444+ paramOids' = hcollapse paramOids

418− prepResultMaybe <- LibPQ.prepare conn temp q Nothing

445+ prepResultMaybe <- LibPQ.prepare conn temp q (Just paramOids')

419 case prepResultMaybe of

446 case prepResultMaybe of

420 Nothing -> throw $ ResultException

447 Nothing -> throw $ ResultException

421 "traversePrepared: LibPQ.prepare returned no results"

448 "traversePrepared: LibPQ.prepare returned no results"

422− Just prepResult -> tryResult prepResult

449+ Just prepResult -> okResult_ prepResult

423 results <- for list $ \ params -> do

450 results <- for list $ \ params -> do

424 let

451 let

425− toParam' encoding = (encodingBytes encoding,LibPQ.Binary)

452+ toParam' encoding = (encodingBytes encoding, LibPQ.Binary)

426 params' = fmap (fmap toParam') (hcollapse (toParams @x @xs params))

453 params' = fmap (fmap toParam') (hcollapse (toParams @x @xs params))

427 resultMaybe <- LibPQ.execPrepared conn temp params' LibPQ.Binary

454 resultMaybe <- LibPQ.execPrepared conn temp params' LibPQ.Binary

428 case resultMaybe of

455 case resultMaybe of

429 Nothing -> throw $ ResultException

456 Nothing -> throw $ ResultException

430 "traversePrepared: LibPQ.execParams returned no results"

457 "traversePrepared: LibPQ.execParams returned no results"

431 Just result -> do

458 Just result -> do

432− tryResult result

459+ okResult_ result

433 return $ K result

460 return $ K result

434 deallocResultMaybe <- LibPQ.exec conn ("DEALLOCATE " <> temp <> ";")

461 deallocResultMaybe <- LibPQ.exec conn ("DEALLOCATE " <> temp <> ";")

435 case deallocResultMaybe of

462 case deallocResultMaybe of

436 Nothing -> throw $ ResultException

463 Nothing -> throw $ ResultException

437 "traversePrepared: LibPQ.exec DEALLOCATE returned no results"

464 "traversePrepared: LibPQ.exec DEALLOCATE returned no results"

438− Just deallocResult -> tryResult deallocResult

465+ Just deallocResult -> okResult_ deallocResult

439 return (K results)

466 return (K results)

440

467

441 traversePrepared_

468 traversePrepared_

442 (UnsafeManipulation q :: Manipulation '[] schemas xs '[]) (list :: list x) =

469 (UnsafeManipulation q :: Manipulation '[] schemas xs '[]) (list :: list x) =

443− PQ $ \ (K conn) -> liftBase $ do

470+ PQ $ \ (K conn) -> liftIO $ do

471+ let

444− let temp = "temporary_statement"

472+ temp = "temporary_statement"

473+ paramOid :: forall p. OidOfParam p => K LibPQ.Oid p

474+ paramOid = K (oidOfParam @p)

475+ paramOids :: NP (K LibPQ.Oid) xs

476+ paramOids = hcpure (Proxy @OidOfParam) paramOid

477+ paramOids' :: [LibPQ.Oid]

478+ paramOids' = hcollapse paramOids

445− prepResultMaybe <- LibPQ.prepare conn temp q Nothing

479+ prepResultMaybe <- LibPQ.prepare conn temp q (Just paramOids')

446 case prepResultMaybe of

480 case prepResultMaybe of

447 Nothing -> throw $ ResultException

481 Nothing -> throw $ ResultException

448 "traversePrepared_: LibPQ.prepare returned no results"

482 "traversePrepared_: LibPQ.prepare returned no results"

449− Just prepResult -> tryResult prepResult

483+ Just prepResult -> okResult_ prepResult

450 for_ list $ \ params -> do

484 for_ list $ \ params -> do

451 let

485 let

452 toParam' encoding = (encodingBytes encoding, LibPQ.Binary)

486 toParam' encoding = (encodingBytes encoding, LibPQ.Binary)

@@ -455,16 +489,16 @@ instance (MonadBase IO io, schemas0 ~ schemas, schemas1 ~ schemas)

455 case resultMaybe of

489 case resultMaybe of

456 Nothing -> throw $ ResultException

490 Nothing -> throw $ ResultException

457 "traversePrepared_: LibPQ.execParams returned no results"

491 "traversePrepared_: LibPQ.execParams returned no results"

458− Just result -> tryResult result

492+ Just result -> okResult_ result

459 deallocResultMaybe <- LibPQ.exec conn ("DEALLOCATE " <> temp <> ";")

493 deallocResultMaybe <- LibPQ.exec conn ("DEALLOCATE " <> temp <> ";")

460 case deallocResultMaybe of

494 case deallocResultMaybe of

461 Nothing -> throw $ ResultException

495 Nothing -> throw $ ResultException

462 "traversePrepared: LibPQ.exec DEALLOCATE returned no results"

496 "traversePrepared: LibPQ.exec DEALLOCATE returned no results"

463− Just deallocResult -> tryResult deallocResult

497+ Just deallocResult -> okResult_ deallocResult

464 return (K ())

498 return (K ())

465

499

466 liftPQ pq = PQ $ \ (K conn) -> do

500 liftPQ pq = PQ $ \ (K conn) -> do

467− y <- liftBase $ pq conn

501+ y <- liftIO $ pq conn

468 return (K y)

502 return (K y)

469

503

470instance MonadPQ schemas m => MonadPQ schemas (IdentityT m)

504instance MonadPQ schemas m => MonadPQ schemas (IdentityT m)

@@ -505,40 +539,29 @@ instance schemas0 ~ schemas1 => MMonad (PQ schemas0 schemas1) where

505 embed f (PQ pq) = PQ $ \ conn -> do

539 embed f (PQ pq) = PQ $ \ conn -> do

506 evalPQ (f (pq conn)) conn

540 evalPQ (f (pq conn)) conn

507

541

508−instance (MonadBase b m, schemas0 ~ schemas1)

509− => MonadBase b (PQ schemas0 schemas1 m) where

510− liftBase = lift . liftBase

511−

512instance (MonadIO m, schema0 ~ schema1)

542instance (MonadIO m, schema0 ~ schema1)

513 => MonadIO (PQ schema0 schema1 m) where

543 => MonadIO (PQ schema0 schema1 m) where

514 liftIO = lift . liftIO

544 liftIO = lift . liftIO

515

545

516−-- | A snapshot of the state of a `PQ` computation.

517−type PQRun schemas =

518− forall m x. Monad m => PQ schemas schemas m x -> m (K x schemas)

519−

520−-- | Helper function in defining `MonadBaseControl` instance for `PQ`.

521−pqliftWith :: Functor m => (PQRun schemas -> m a) -> PQ schemas schemas m a

522−pqliftWith f = PQ $ \ conn ->

523− fmap K (f $ \ pq -> unPQ pq conn)

524−

525−instance (MonadBaseControl b m, schemas0 ~ schemas1)

546+instance (MonadUnliftIO m, schemas0 ~ schemas1)

526− => MonadBaseControl b (PQ schemas0 schemas1 m) where

547+ => MonadUnliftIO (PQ schemas0 schemas1 m) where

527− type StM (PQ schemas0 schemas1 m) x = StM m (K x schemas0)

548+ withRunInIO

528− liftBaseWith f =

549+ :: ((forall a . PQ schemas0 schema1 m a -> IO a) -> IO b)

529− pqliftWith $ \ run -> liftBaseWith $ \ runInBase -> f $ runInBase . run

550+ -> PQ schemas0 schema1 m b

530− restoreM = PQ . const . restoreM

551+ withRunInIO inner = PQ $ \conn ->

552+ withRunInIO $ \(run :: (forall x . m x -> IO x)) ->

553+ K <$> inner (\pq -> run $ unK <$> unPQ pq conn)

531

554

532-- | Get a row corresponding to a given row number from a `LibPQ.Result`,

555-- | Get a row corresponding to a given row number from a `LibPQ.Result`,

533-- throwing an exception if the row number is out of bounds.

556-- throwing an exception if the row number is out of bounds.

534getRow

557getRow

535− :: (FromRow columns y, MonadBase IO io)

558+ :: (FromRow columns y, MonadIO io)

536 => LibPQ.Row

559 => LibPQ.Row

537 -- ^ row number

560 -- ^ row number

538 -> K LibPQ.Result columns

561 -> K LibPQ.Result columns

539 -- ^ result

562 -- ^ result

540 -> io y

563 -> io y

541−getRow r (K result :: K LibPQ.Result columns) = liftBase $ do

564+getRow r (K result :: K LibPQ.Result columns) = liftIO $ do

542 numRows <- LibPQ.ntuples result

565 numRows <- LibPQ.ntuples result

543 when (numRows < r) $ throw $ ResultException $

566 when (numRows < r) $ throw $ ResultException $

544 "getRow: expected at least " <> pack (show r) <> "rows but only saw "

567 "getRow: expected at least " <> pack (show r) <> "rows but only saw "

@@ -556,13 +579,13 @@ getRow r (K result :: K LibPQ.Result columns) = liftBase $ do

556-- and a `LibPQ.Result` and given a row number if it's too large returns `Nothing`,

579-- and a `LibPQ.Result` and given a row number if it's too large returns `Nothing`,

557-- otherwise returning the row along with the next row number.

580-- otherwise returning the row along with the next row number.

558nextRow

581nextRow

559− :: (FromRow columns y, MonadBase IO io)

582+ :: (FromRow columns y, MonadIO io)

560 => LibPQ.Row -- ^ total number of rows

583 => LibPQ.Row -- ^ total number of rows

561 -> K LibPQ.Result columns -- ^ result

584 -> K LibPQ.Result columns -- ^ result

562 -> LibPQ.Row -- ^ row number

585 -> LibPQ.Row -- ^ row number

563 -> io (Maybe (LibPQ.Row,y))

586 -> io (Maybe (LibPQ.Row,y))

564nextRow total (K result :: K LibPQ.Result columns) r

587nextRow total (K result :: K LibPQ.Result columns) r

565− = liftBase $ if r >= total then return Nothing else do

588+ = liftIO $ if r >= total then return Nothing else do

566 let len = fromIntegral (lengthSList (Proxy @columns))

589 let len = fromIntegral (lengthSList (Proxy @columns))

567 row' <- traverse (LibPQ.getvalue result r) [0 .. len - 1]

590 row' <- traverse (LibPQ.getvalue result r) [0 .. len - 1]

568 case fromList row' of

591 case fromList row' of

@@ -573,10 +596,10 @@ nextRow total (K result :: K LibPQ.Result columns) r

573

596

574-- | Get all rows from a `LibPQ.Result`.

597-- | Get all rows from a `LibPQ.Result`.

575getRows

598getRows

576− :: (FromRow columns y, MonadBase IO io)

599+ :: (FromRow columns y, MonadIO io)

577 => K LibPQ.Result columns -- ^ result

600 => K LibPQ.Result columns -- ^ result

578 -> io [y]

601 -> io [y]

579−getRows (K result :: K LibPQ.Result columns) = liftBase $ do

602+getRows (K result :: K LibPQ.Result columns) = liftIO $ do

580 let len = fromIntegral (lengthSList (Proxy @columns))

603 let len = fromIntegral (lengthSList (Proxy @columns))

581 numRows <- LibPQ.ntuples result

604 numRows <- LibPQ.ntuples result

582 for [0 .. numRows - 1] $ \ r -> do

605 for [0 .. numRows - 1] $ \ r -> do

@@ -589,10 +612,10 @@ getRows (K result :: K LibPQ.Result columns) = liftBase $ do

589

612

590-- | Get the first row if possible from a `LibPQ.Result`.

613-- | Get the first row if possible from a `LibPQ.Result`.

591firstRow

614firstRow

592− :: (FromRow columns y, MonadBase IO io)

615+ :: (FromRow columns y, MonadIO io)

593 => K LibPQ.Result columns -- ^ result

616 => K LibPQ.Result columns -- ^ result

594 -> io (Maybe y)

617 -> io (Maybe y)

595−firstRow (K result :: K LibPQ.Result columns) = liftBase $ do

618+firstRow (K result :: K LibPQ.Result columns) = liftIO $ do

596 numRows <- LibPQ.ntuples result

619 numRows <- LibPQ.ntuples result

597 if numRows <= 0 then return Nothing else do

620 if numRows <= 0 then return Nothing else do

598 let len = fromIntegral (lengthSList (Proxy @columns))

621 let len = fromIntegral (lengthSList (Proxy @columns))

@@ -605,23 +628,23 @@ firstRow (K result :: K LibPQ.Result columns) = liftBase $ do

605

628

606-- | Lifts actions on results from @LibPQ@.

629-- | Lifts actions on results from @LibPQ@.

607liftResult

630liftResult

608− :: MonadBase IO io

631+ :: MonadIO io

609 => (LibPQ.Result -> IO x)

632 => (LibPQ.Result -> IO x)

610 -> K LibPQ.Result results -> io x

633 -> K LibPQ.Result results -> io x

611−liftResult f (K result) = liftBase $ f result

634+liftResult f (K result) = liftIO $ f result

612

635

613-- | Returns the number of rows (tuples) in the query result.

636-- | Returns the number of rows (tuples) in the query result.

614−ntuples :: MonadBase IO io => K LibPQ.Result columns -> io LibPQ.Row

637+ntuples :: MonadIO io => K LibPQ.Result columns -> io LibPQ.Row

615ntuples = liftResult LibPQ.ntuples

638ntuples = liftResult LibPQ.ntuples

616

639

617-- | Returns the result status of the command.

640-- | Returns the result status of the command.

618−resultStatus :: MonadBase IO io => K LibPQ.Result results -> io LibPQ.ExecStatus

641+resultStatus :: MonadIO io => K LibPQ.Result results -> io LibPQ.ExecStatus

619resultStatus = liftResult LibPQ.resultStatus

642resultStatus = liftResult LibPQ.resultStatus

620

643

621-- | Returns the error message most recently generated by an operation

644-- | Returns the error message most recently generated by an operation

622-- on the connection.

645-- on the connection.

623resultErrorMessage

646resultErrorMessage

624− :: MonadBase IO io => K LibPQ.Result results -> io (Maybe ByteString)

647+ :: MonadIO io => K LibPQ.Result results -> io (Maybe ByteString)

625resultErrorMessage = liftResult LibPQ.resultErrorMessage

648resultErrorMessage = liftResult LibPQ.resultErrorMessage

626

649

627-- | Returns the error code most recently generated by an operation

650-- | Returns the error code most recently generated by an operation

@@ -629,29 +652,29 @@ resultErrorMessage = liftResult LibPQ.resultErrorMessage

629--

652--

630-- https://www.postgresql.org/docs/current/static/errcodes-appendix.html

653-- https://www.postgresql.org/docs/current/static/errcodes-appendix.html

631resultErrorCode

654resultErrorCode

632− :: MonadBase IO io

655+ :: MonadIO io

633 => K LibPQ.Result results

656 => K LibPQ.Result results

634 -> io (Maybe ByteString)

657 -> io (Maybe ByteString)

635resultErrorCode = liftResult (flip LibPQ.resultErrorField LibPQ.DiagSqlstate)

658resultErrorCode = liftResult (flip LibPQ.resultErrorField LibPQ.DiagSqlstate)

636

659

637−-- | `Exception`s that can be thrown by Squeal.

660+-- | the state of LibPQ

638−data SquealException

661+data PQState = PQState

639− = PQException

640 { sqlExecStatus :: LibPQ.ExecStatus

662 { sqlExecStatus :: LibPQ.ExecStatus

641 , sqlStateCode :: Maybe ByteString

663 , sqlStateCode :: Maybe ByteString

642 -- ^ https://www.postgresql.org/docs/current/static/errcodes-appendix.html

664 -- ^ https://www.postgresql.org/docs/current/static/errcodes-appendix.html

643 , sqlErrorMessage :: Maybe ByteString

665 , sqlErrorMessage :: Maybe ByteString

644− }

666+ } deriving (Eq, Show)

667+

668+-- | `Exception`s that can be thrown by Squeal.

669+data SquealException

670+ = PQException PQState

645 | ResultException Text

671 | ResultException Text

646 | ParseException Text

672 | ParseException Text

647 deriving (Eq, Show)

673 deriving (Eq, Show)

648instance Exception SquealException

674instance Exception SquealException

649

675

650−tryResult

651− :: MonadBase IO io

652− => LibPQ.Result

676+okResult_ :: MonadIO io => LibPQ.Result -> io ()

653− -> io ()

677+okResult_ result = liftIO $ do

654−tryResult result = liftBase $ do

655 status <- LibPQ.resultStatus result

678 status <- LibPQ.resultStatus result

656 case status of

679 case status of

657 LibPQ.CommandOk -> return ()

680 LibPQ.CommandOk -> return ()

@@ -659,11 +682,16 @@ tryResult result = liftBase $ do

659 _ -> do

682 _ -> do

660 stateCode <- LibPQ.resultErrorField result LibPQ.DiagSqlstate

683 stateCode <- LibPQ.resultErrorField result LibPQ.DiagSqlstate

661 msg <- LibPQ.resultErrorMessage result

684 msg <- LibPQ.resultErrorMessage result

662− throw $ PQException status stateCode msg

685+ throw . PQException $ PQState status stateCode msg

686+

687+-- | Check if a `LibPQ.Result`'s status is either `LibPQ.CommandOk`

688+-- or `LibPQ.TuplesOk` otherwise `throw` a `PQException`.

689+okResult :: MonadIO io => K LibPQ.Result row -> io ()

690+okResult = okResult_ . unK

663

691

664-- | Catch `SquealException`s.

692-- | Catch `SquealException`s.

665catchSqueal

693catchSqueal

666− :: MonadBaseControl IO io

694+ :: MonadUnliftIO io

667 => io a

695 => io a

668 -> (SquealException -> io a) -- ^ handler

696 -> (SquealException -> io a) -- ^ handler

669 -> io a

697 -> io a

@@ -671,7 +699,14 @@ catchSqueal = catch

671

699

672-- | Handle `SquealException`s.

700-- | Handle `SquealException`s.

673handleSqueal

701handleSqueal

674− :: MonadBaseControl IO io

702+ :: MonadUnliftIO io

675 => (SquealException -> io a) -- ^ handler

703 => (SquealException -> io a) -- ^ handler

676 -> io a -> io a

704 -> io a -> io a

677handleSqueal = handle

705handleSqueal = 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+72−109

@@ -1,17 +1,40 @@

1{-|

2−Module: Squeal.PostgreSQL.Definition

2+Module: Squeal.PostgreSQL.Pool

3−Description: Pooled connections

3+Description: Connection pools

4Copyright: (c) Eitan Chatav, 2017

5Maintainer: eitan@morphism.tech

6Stability: experimental

8−A `MonadPQ` for pooled connections.

8+Connection pools.

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

9-}

31-}

11{-# LANGUAGE

33{-# LANGUAGE

12 DeriveFunctor

34 DeriveFunctor

13 , FlexibleContexts

35 , FlexibleContexts

14 , FlexibleInstances

36 , FlexibleInstances

37+ , InstanceSigs

15 , MultiParamTypeClasses

38 , MultiParamTypeClasses

16 , RankNTypes

39 , RankNTypes

17 , ScopedTypeVariables

40 , ScopedTypeVariables

@@ -22,57 +45,24 @@ A `MonadPQ` for pooled connections.

23module Squeal.PostgreSQL.Pool

46module Squeal.PostgreSQL.Pool

24 ( -- * Pools

47 ( -- * Pools

25− PoolPQ (..)

48+ Pool

26 , createConnectionPool

49 , createConnectionPool

27− , Pool

50+ , usingConnectionPool

28− , destroyAllResources

51+ , destroyConnectionPool

29− , PoolPQRun

30− , poolpqliftWith

31 ) where

52 ) where

33−import Control.Monad.Base

34−import Control.Monad.Trans

35−import Control.Monad.Trans.Control

36import Data.ByteString

54import Data.ByteString

37−import Data.Pool

38import Data.Time

55import Data.Time

39−import Generics.SOP (K(..))

56+import Generics.SOP (K(..), unK)

40−

57+import UnliftIO (MonadUnliftIO (..))

41−import qualified Control.Monad.Fail as Fail

58+import UnliftIO.Pool (Pool, createPool, destroyAllResources, withResource)

43import Squeal.PostgreSQL.PQ

60import 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

72-- | Create a striped pool of connections.

62-- | Create a striped pool of connections.

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.

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.

74createConnectionPool

64createConnectionPool

75− :: MonadBase IO io

65+ :: MonadUnliftIO io

76 => ByteString

66 => ByteString

77 -- ^ The passed string can be empty to use all default parameters, or it can

67 -- ^ The passed string can be empty to use all default parameters, or it can

78 -- contain one or more parameter settings separated by whitespace.

68 -- contain one or more parameter settings separated by whitespace.

@@ -89,71 +79,44 @@ createConnectionPool

89 -- ^ Maximum number of connections to keep open per stripe. The smallest acceptable value is 1.

79 -- ^ Maximum number of connections to keep open per stripe. The smallest acceptable value is 1.

90 -- Requests for connections will block if this limit is reached on a single stripe, even if other stripes have idle connections available.

80 -- Requests for connections will block if this limit is reached on a single stripe, even if other stripes have idle connections available.

91 -> io (Pool (K Connection schemas))

81 -> io (Pool (K Connection schemas))

92−createConnectionPool conninfo stripes idle maxResrc = liftBase $

82+createConnectionPool conninfo stripes idle maxResrc =

93 createPool (connectdb conninfo) finish stripes idle maxResrc

83 createPool (connectdb conninfo) finish stripes idle maxResrc

95−-- | `Applicative` instance for `PoolPQ`.

85+{-|

96−instance Monad m => Applicative (PoolPQ schemas m) where

86+Temporarily take a connection from a `Pool`, perform an action with it,

97− pure x = PoolPQ $ \ _ -> pure x

87+and return it to the pool afterwards.

98− PoolPQ f <*> PoolPQ x = PoolPQ $ \ pool -> do

88+

99− f' <- f pool

89+If the pool has an idle connection available, it is used immediately.

100− x' <- x pool

90+Otherwise, if the maximum number of connections has not yet been reached,

101− return $ f' x'

91+a new connection is created and used.

102−

92+If the maximum number of connections has been reached, this function blocks

103−-- | `Monad` instance for `PoolPQ`.

93+until a connection becomes available.

104−instance Monad m => Monad (PoolPQ schemas m) where

94+-}

105− return = pure

95+usingConnectionPool

106− PoolPQ x >>= f = PoolPQ $ \ pool -> do

96+ :: MonadUnliftIO io

107− x' <- x pool

97+ => Pool (K Connection schemas) -- ^ pool

108− runPoolPQ (f x') pool

98+ -> PQ schemas schemas io x -- ^ session

109−

99+ -> io x

110−-- | `Fail.MonadFail` instance for `PoolPQ`.

100+usingConnectionPool pool (PQ session) = unK <$> withResource pool session

111−instance Monad m => Fail.MonadFail (PoolPQ schemas m) where

101+

112− fail = Fail.fail

102+{- |

113−

103+Destroy all connections in all stripes in the pool.

114−-- | `MonadTrans` instance for `PoolPQ`.

104+Note that this will ignore any exceptions in the destroy function.

115−instance MonadTrans (PoolPQ schemas) where

105+

116− lift m = PoolPQ $ \ _pool -> m

106+This function is useful when you detect that all connections

117−

107+in the pool are broken. For example after a database has been

118−-- | `MonadBase` instance for `PoolPQ`.

108+restarted all connections opened before the restart will be broken.

119−instance MonadBase b m => MonadBase b (PoolPQ schemas m) where

109+In that case it's better to close those connections so that

120− liftBase = lift . liftBase

110+`usingConnectionPool` won't take a broken connection from the pool

121−

111+but will open a new connection instead.

122−-- | `MonadPQ` instance for `PoolPQ`.

112+

123−instance MonadBaseControl IO io => MonadPQ schemas (PoolPQ schemas io) where

113+Another use-case for this function is that when you know you are done

124− manipulateParams manipulation params = PoolPQ $ \ pool -> do

114+with the pool you can destroy all idle connections immediately

125− withResource pool $ \ conn -> do

115+instead of waiting on the garbage collector to destroy them,

126− (K result :: K (K Result ys) schemas) <- flip unPQ conn $

116+thus freeing up those connections sooner.

127− manipulateParams manipulation params

117+-}

128− return result

118+destroyConnectionPool

129− traversePrepared manipulation params = PoolPQ $ \ pool ->

119+ :: MonadUnliftIO io

130− withResource pool $ \ conn -> do

120+ => Pool (K Connection schemas) -- ^ pool

131− (K result :: K (list (K Result ys)) schemas) <- flip unPQ conn $

121+ -> io ()

132− traversePrepared manipulation params

122+destroyConnectionPool = destroyAllResources

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+311−414

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

1{-|

2Module: Squeal.PostgreSQL.Query

3Description: Squeal queries

4−Copyright: (c) Eitan Chatav, 2017

4+Copyright: (c) Eitan Chatav, 2019

5Maintainer: eitan@morphism.tech

6Stability: experimental

@@ -17,6 +17,7 @@ Squeal queries.

17 , GeneralizedNewtypeDeriving

18 , LambdaCase

19 , MultiParamTypeClasses

20+ , OverloadedLabels

20 , OverloadedStrings

21 , OverloadedStrings

21 , QuantifiedConstraints

22 , QuantifiedConstraints

22 , ScopedTypeVariables

23 , ScopedTypeVariables

@@ -31,13 +32,15 @@ Squeal queries.

32module Squeal.PostgreSQL.Query

33module Squeal.PostgreSQL.Query

33 ( -- * Queries

34 ( -- * Queries

35+ Query_

34− Query (..)

36+ , Query (..)

35− , Query_

36 -- ** Select

37 -- ** Select

37 , select

38 , select

38 , select_

39 , select_

39 , selectDistinct

40 , selectDistinct

40 , selectDistinct_

41 , selectDistinct_

42+ , selectDistinctOn

43+ , selectDistinctOn_

41 , Selection (..)

44 , Selection (..)

42 -- ** Values

45 -- ** Values

43 , values

46 , values

@@ -52,23 +55,7 @@ module Squeal.PostgreSQL.Query

52 -- ** With

55 -- ** With

53 , With (..)

56 , With (..)

54 , CommonTableExpression (..)

57 , CommonTableExpression (..)

55− -- ** Unnest

58+ , withRecursive

56− , unnest

57− -- ** Json

58− , jsonEach

59− , jsonbEach

60− , jsonEachAsText

61− , jsonbEachAsText

62− , jsonObjectKeys

63− , jsonbObjectKeys

64− , jsonPopulateRecord

65− , jsonbPopulateRecord

66− , jsonPopulateRecordSet

67− , jsonbPopulateRecordSet

68− , jsonToRecord

69− , jsonbToRecord

70− , jsonToRecordSet

71− , jsonbToRecordSet

72 -- * Table Expressions

59 -- * Table Expressions

73 , TableExpression (..)

60 , TableExpression (..)

74 , from

61 , from

@@ -92,13 +79,6 @@ module Squeal.PostgreSQL.Query

92 , By (..)

79 , By (..)

93 , GroupByClause (..)

80 , GroupByClause (..)

94 , HavingClause (..)

81 , HavingClause (..)

95− -- * Subquery Expressions

96− , exists

97− , in_

98− , notIn

99− , Operator

100− , subAll

101− , subAny

102 ) where

82 ) where

103

104import Control.DeepSeq

84import Control.DeepSeq

@@ -111,14 +91,67 @@ import GHC.TypeLits

111

112import qualified GHC.Generics as GHC

92import qualified GHC.Generics as GHC

113

114−import Squeal.PostgreSQL.Binary

94+import Squeal.PostgreSQL.Alias

115import Squeal.PostgreSQL.Expression

95import 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

116import Squeal.PostgreSQL.Render

101import Squeal.PostgreSQL.Render

117import Squeal.PostgreSQL.Schema

102import Squeal.PostgreSQL.Schema

118

103

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+

119{- |

133{- |

120−The process of retrieving or the command to retrieve data from a database

134+The top level `Query_` type is parameterized by a @schemas@ `SchemasType`,

135+against which the query is type-checked, an input @parameters@ Haskell `Type`,

136+and an ouput row Haskell `Type`.

137+

138+A top-level query can be run

139+using `Squeal.PostgreSQL.PQ.runQueryParams`, or if @parameters = ()@

140+using `Squeal.PostgreSQL.PQ.runQuery`.

141+

142+Generally, @parameters@ will be a Haskell tuple or record whose entries

143+may be referenced using positional

144+`Squeal.PostgreSQL.Expression.Parameter.parameter`s and @row@ will be a

145+Haskell record, whose entries will be targeted using overloaded labels.

146+

121−is called a `Query`. Let's see some examples of queries.

147+Let's see some examples of queries.

148+

149+>>> :set -XDeriveAnyClass -XDerivingStrategies

150+>>> :{

151+data Row a b = Row { col1 :: a, col2 :: b }

152+ deriving stock (GHC.Generic)

153+ deriving anyclass (SOP.Generic, SOP.HasDatatypeInfo)

154+:}

122

155

123simple query:

156simple query:

124

157

@@ -126,7 +159,7 @@ simple query:

126>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]

159>>> type Schema = '["tab" ::: 'Table ('[] :=> Columns)]

127>>> :{

160>>> :{

128let

161let

129− query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

162+ query :: Query_ (Public Schema) () (Row Int32 Int32)

130 query = select Star (from (table #tab))

163 query = select Star (from (table #tab))

131in printSQL query

164in printSQL query

132:}

165:}

@@ -136,21 +169,21 @@ restricted query:

136

169

137>>> :{

170>>> :{

138let

171let

139− query :: Query '[] '[] (Public Schema) '[] '["sum" ::: 'NotNull 'PGint4, "col1" ::: 'NotNull 'PGint4]

172+ query :: Query_ (Public Schema) () (Row Int32 Int32)

140 query =

173 query =

141− select_ ((#col1 + #col2) `as` #sum :* #col1)

174+ select_ ((#col1 + #col2) `as` #col1 :* #col1 `as` #col2)

142 ( from (table #tab)

175 ( from (table #tab)

143 & where_ (#col1 .> #col2)

176 & where_ (#col1 .> #col2)

144 & where_ (#col2 .> 0) )

177 & where_ (#col2 .> 0) )

145in printSQL query

178in printSQL query

146:}

179:}

147−SELECT ("col1" + "col2") AS "sum", "col1" AS "col1" FROM "tab" AS "tab" WHERE (("col1" > "col2") AND ("col2" > 0))

180+SELECT ("col1" + "col2") AS "col1", "col1" AS "col2" FROM "tab" AS "tab" WHERE (("col1" > "col2") AND ("col2" > 0))

148

181

149subquery:

182subquery:

150

183

151>>> :{

184>>> :{

152let

185let

153− query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

186+ query :: Query_ (Public Schema) () (Row Int32 Int32)

154 query = select Star (from (subquery (select Star (from (table #tab)) `as` #sub)))

187 query = select Star (from (subquery (select Star (from (table #tab)) `as` #sub)))

155in printSQL query

188in printSQL query

156:}

189:}

@@ -160,7 +193,7 @@ limits and offsets:

160

193

161>>> :{

194>>> :{

162let

195let

163− query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

196+ query :: Query_ (Public Schema) () (Row Int32 Int32)

164 query = select Star (from (table #tab) & limit 100 & offset 2 & limit 50 & offset 2)

197 query = select Star (from (table #tab) & limit 100 & offset 2 & limit 50 & offset 2)

165in printSQL query

198in printSQL query

166:}

199:}

@@ -170,7 +203,7 @@ parameterized query:

170

203

171>>> :{

204>>> :{

172let

205let

173− query :: Query '[] '[] (Public Schema) '[ 'NotNull 'PGint4] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

206+ query :: Query_ (Public Schema) (Only Int32) (Row Int32 Int32)

174 query = select Star (from (table #tab) & where_ (#col1 .> param @1))

207 query = select Star (from (table #tab) & where_ (#col1 .> param @1))

175in printSQL query

208in printSQL query

176:}

209:}

@@ -180,21 +213,21 @@ aggregation query:

180

213

181>>> :{

214>>> :{

182let

215let

183− query :: Query '[] '[] (Public Schema) '[] '["sum" ::: 'NotNull 'PGint4, "col1" ::: 'NotNull 'PGint4 ]

216+ query :: Query_ (Public Schema) () (Row Int64 Int32)

184 query =

217 query =

185− select_ (sum_ (All #col2) `as` #sum :* #col1)

218+ select_ ((fromNull 0 (sum_ (All #col2))) `as` #col1 :* #col1 `as` #col2)

186 ( from (table (#tab `as` #table1))

219 ( from (table (#tab `as` #table1))

187 & groupBy #col1

220 & groupBy #col1

188− & having (#col1 + sum_ (Distinct #col2) .> 1) )

221+ & having (sum_ (Distinct #col2) .> 1) )

189in printSQL query

222in printSQL query

190:}

223:}

191−SELECT sum(ALL "col2") AS "sum", "col1" AS "col1" FROM "tab" AS "table1" GROUP BY "col1" HAVING (("col1" + sum(DISTINCT "col2")) > 1)

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

225

193sorted query:

226sorted query:

194

227

195>>> :{

228>>> :{

196let

229let

197− query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

230+ query :: Query_ (Public Schema) () (Row Int32 Int32)

198 query = select Star (from (table #tab) & orderBy [#col1 & Asc])

231 query = select Star (from (table #tab) & orderBy [#col1 & Asc])

199in printSQL query

232in printSQL query

200:}

233:}

@@ -202,14 +235,12 @@ SELECT * FROM "tab" AS "tab" ORDER BY "col1" ASC

202

235

203joins:

236joins:

204

237

205−>>> :set -XFlexibleContexts

206>>> :{

238>>> :{

207type OrdersColumns =

239type OrdersColumns =

208 '[ "id" ::: 'NoDef :=> 'NotNull 'PGint4

240 '[ "id" ::: 'NoDef :=> 'NotNull 'PGint4

209− , "price" ::: 'NoDef :=> 'NotNull 'PGfloat4

241+ , "price" ::: 'NoDef :=> 'NotNull 'PGfloat4

210− , "customer_id" ::: 'NoDef :=> 'NotNull 'PGint4

242+ , "customer_id" ::: 'NoDef :=> 'NotNull 'PGint4

211− , "shipper_id" ::: 'NoDef :=> 'NotNull 'PGint4

243+ , "shipper_id" ::: 'NoDef :=> 'NotNull 'PGint4 ]

212− ]

213:}

244:}

214

245

215>>> :{

246>>> :{

@@ -225,22 +256,27 @@ type OrdersConstraints =

225>>> :{

256>>> :{

226type OrdersSchema =

257type OrdersSchema =

227 '[ "orders" ::: 'Table (OrdersConstraints :=> OrdersColumns)

258 '[ "orders" ::: 'Table (OrdersConstraints :=> OrdersColumns)

228− , "customers" ::: 'Table (CustomersConstraints :=> NamesColumns)

259+ , "customers" ::: 'Table (CustomersConstraints :=> NamesColumns)

229− , "shippers" ::: 'Table (ShippersConstraints :=> NamesColumns) ]

260+ , "shippers" ::: 'Table (ShippersConstraints :=> NamesColumns) ]

261+:}

262+

263+>>> :{

264+data Order = Order

265+ { price :: Float

266+ , customerName :: Text

267+ , shipperName :: Text

268+ } deriving GHC.Generic

269+instance SOP.Generic Order

270+instance SOP.HasDatatypeInfo Order

230:}

271:}

231

272

232>>> :{

273>>> :{

233let

274let

234− query :: Query '[] '[] (Public OrdersSchema)

275+ query :: Query_ (Public OrdersSchema) () Order

235− '[]

236− '[ "order_price" ::: 'NotNull 'PGfloat4

237− , "customer_name" ::: 'NotNull 'PGtext

238− , "shipper_name" ::: 'NotNull 'PGtext

239− ]

240 query = select_

276 query = select_

241− ( #o ! #price `as` #order_price :*

277+ ( #o ! #price `as` #price :*

242− #c ! #name `as` #customer_name :*

278+ #c ! #name `as` #customerName :*

243− #s ! #name `as` #shipper_name )

279+ #s ! #name `as` #shipperName )

244 ( from (table (#orders `as` #o)

280 ( from (table (#orders `as` #o)

245 & innerJoin (table (#customers `as` #c))

281 & innerJoin (table (#customers `as` #c))

246 (#o ! #customer_id .== #c ! #id)

282 (#o ! #customer_id .== #c ! #id)

@@ -248,14 +284,16 @@ let

248 (#o ! #shipper_id .== #s ! #id)) )

284 (#o ! #shipper_id .== #s ! #id)) )

249in printSQL query

285in printSQL query

250:}

286:}

251−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")

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

288

253self-join:

289self-join:

254

290

255>>> :{

291>>> :{

256let

292let

257− query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

293+ query :: Query_ (Public Schema) () (Row Int32 Int32)

294+ query = select

295+ (#t1 & DotStar)

258− query = select (#t1 & DotStar) (from (table (#tab `as` #t1) & crossJoin (table (#tab `as` #t2))))

296+ (from (table (#tab `as` #t1) & crossJoin (table (#tab `as` #t2))))

259in printSQL query

297in printSQL query

260:}

298:}

261SELECT "t1".* FROM "tab" AS "t1" CROSS JOIN "tab" AS "t2"

299SELECT "t1".* FROM "tab" AS "t1" CROSS JOIN "tab" AS "t2"

@@ -264,17 +302,19 @@ value queries:

264

302

265>>> :{

303>>> :{

266let

304let

267− query :: Query '[] commons schemas '[] '["foo" ::: 'NotNull 'PGint2, "bar" ::: 'NotNull 'PGbool]

305+ query :: Query_ schemas () (Row String Bool)

268− query = values (1 `as` #foo :* true `as` #bar) [2 `as` #foo :* false `as` #bar]

306+ query = values

307+ ("true" `as` #col1 :* true `as` #col2)

308+ ["false" `as` #col1 :* false `as` #col2]

269in printSQL query

309in printSQL query

270:}

310:}

271−SELECT * FROM (VALUES (1, TRUE), (2, FALSE)) AS t ("foo", "bar")

311+SELECT * FROM (VALUES (E'true', TRUE), (E'false', FALSE)) AS t ("col1", "col2")

272

312

273set operations:

313set operations:

274

314

275>>> :{

315>>> :{

276let

316let

277− query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

317+ query :: Query_ (Public Schema) () (Row Int32 Int32)

278 query = select Star (from (table #tab)) `unionAll` select Star (from (table #tab))

318 query = select Star (from (table #tab)) `unionAll` select Star (from (table #tab))

279in printSQL query

319in printSQL query

280:}

320:}

@@ -284,7 +324,7 @@ with queries:

284

324

285>>> :{

325>>> :{

286let

326let

287− query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4, "col2" ::: 'NotNull 'PGint4]

327+ query :: Query_ (Public Schema) () (Row Int32 Int32)

288 query = with (

328 query = with (

289 select Star (from (table #tab)) `as` #cte1 :>>

329 select Star (from (table #tab)) `as` #cte1 :>>

290 select Star (from (common #cte1)) `as` #cte2

330 select Star (from (common #cte1)) `as` #cte2

@@ -297,40 +337,35 @@ window function queries

297

337

298>>> :{

338>>> :{

299let

339let

300− query :: Query '[] '[] (Public Schema) '[] ["col1" ::: 'NotNull 'PGint4, "rank" ::: 'NotNull 'PGint8]

340+ query :: Query_ (Public Schema) () (Row Int32 Int64)

301 query = select

341 query = select

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

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

303 (from (table #tab))

343 (from (table #tab))

304in printSQL query

344in printSQL query

305:}

345:}

306−SELECT "col1" AS "col1", rank() OVER (PARTITION BY "col1" ORDER BY "col2" ASC) AS "rank" FROM "tab" AS "tab"

346+SELECT "col1" AS "col1", rank() OVER (PARTITION BY "col1" ORDER BY "col2" ASC) AS "col2" FROM "tab" AS "tab"

307

347

308correlated subqueries

348correlated subqueries

309

349

310>>> :{

350>>> :{

311let

351let

312− query :: Query '[] '[] (Public Schema) '[] '["col1" ::: 'NotNull 'PGint4]

352+ query :: Query_ (Public Schema) () (Only Int32)

313 query =

353 query =

314− select #col1 (from (table (#tab `as` #t1))

354+ select (#col1 `as` #fromOnly) (from (table (#tab `as` #t1))

315 & where_ (exists (

355 & where_ (exists (

316 select Star (from (table (#tab `as` #t2))

356 select Star (from (table (#tab `as` #t2))

317 & where_ (#t2 ! #col2 .== #t1 ! #col1)))))

357 & where_ (#t2 ! #col2 .== #t1 ! #col1)))))

318in printSQL query

358in printSQL query

319:}

359:}

320−SELECT "col1" AS "col1" FROM "tab" AS "t1" WHERE EXISTS (SELECT * FROM "tab" AS "t2" WHERE ("t2"."col2" = "t1"."col1"))

360+SELECT "col1" AS "fromOnly" FROM "tab" AS "t1" WHERE EXISTS (SELECT * FROM "tab" AS "t2" WHERE ("t2"."col2" = "t1"."col1"))

361+

321-}

362-}

322−newtype Query

363+type family Query_

323− (outer :: FromType)

324− (commons :: FromType)

325 (schemas :: SchemasType)

364 (schemas :: SchemasType)

326− (params :: [NullityType])

365+ (parameters :: Type)

327− (row :: RowType)

366+ (row :: Type) where

328− = UnsafeQuery { renderQuery :: ByteString }

367+ Query_ schemas params row =

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

330−instance RenderSQL (Query outer commons schemas params row) where renderSQL = renderQuery

331−

332−type family Query_ (schemas :: SchemasType) (params :: Type) (row :: Type) where

333− Query_ schemas params row = Query '[] '[] schemas (TuplePG params) (RowPG row)

368+ Query '[] '[] schemas (TuplePG params) (RowPG row)

334

369

335-- | The results of two queries can be combined using the set operation

370-- | The results of two queries can be combined using the set operation

336-- `union`. Duplicate rows are eliminated.

371-- `union`. Duplicate rows are eliminated.

@@ -402,35 +437,48 @@ q1 `exceptAll` q2 = UnsafeQuery $

402SELECT queries

437SELECT queries

403-----------------------------------------}

438-----------------------------------------}

404

439

440+{- | The simplest kinds of `Selection` are `Star` and `DotStar` which

441+emits all columns that a `TableExpression` produces. A select `List`

442+is a list of `Expression`s. A `Selection` could be a list of

443+`WindowFunction`s `Over` `WindowDefinition`. `Additional` `Selection`s can

444+be selected with `Also`.

445+-}

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

446+data Selection outer commons grp schemas params from row where

406− List

407− :: SListI row

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

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

410 Star

447 Star

411 :: HasUnique tab from row

448 :: HasUnique tab from row

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

449+ => Selection outer commons 'Ungrouped schemas params from row

450+ -- ^ `HasUnique` table in the `FromClause`

413 DotStar

451 DotStar

414 :: Has tab from row

452 :: Has tab from row

415 => Alias tab

453 => Alias tab

454+ -- ^ `Has` table with `Alias`

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

455+ -> Selection outer commons 'Ungrouped schemas params from row

417− Also

456+ List

457+ :: SListI row

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

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

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

459+ -- ^ `NP` list of `Aliased` `Expression`s

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

460+ -> Selection outer commons grp schemas params from row

421 Over

461 Over

422 :: SListI row

462 :: SListI row

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

463+ => NP (Aliased (WindowFunction outer commons grp schemas params from)) row

464+ -- ^ `NP` list of `Aliased` `WindowFunction`s

465+ -> WindowDefinition outer commons grp schemas params from

466+ -> Selection outer commons grp schemas params from row

467+ Also

468+ :: Selection outer commons grp schemas params from right

469+ -- ^ `Additional` `Selection`

424− -> WindowDefinition outer grp commons schemas params from

470+ -> Selection outer commons grp schemas params from left

471+ -> Selection outer commons grp schemas params from (Join left right)

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

472+instance Additional (Selection outer commons grp schemas params from) where

473+ also = Also

426instance (KnownSymbol col, row ~ '[col ::: ty])

474instance (KnownSymbol col, row ~ '[col ::: ty])

427 => Aliasable col

475 => Aliasable col

428− (Expression outer grp commons schemas params from ty)

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

429− (Selection outer grp commons schemas params from row) where

477+ (Selection outer commons grp schemas params from row) where

430 expr `as` col = List (expr `as` col)

478 expr `as` col = List (expr `as` col)

431instance (Has tab (Join outer from) row0, Has col row0 ty, row1 ~ '[col ::: ty])

479instance (Has tab (Join outer from) row0, Has col row0 ty, row1 ~ '[col ::: ty])

432 => IsQualified tab col

480 => IsQualified tab col

433− (Selection outer 'Ungrouped commons schemas params from row1) where

481+ (Selection outer commons 'Ungrouped schemas params from row1) where

434 tab ! col = tab ! col `as` col

482 tab ! col = tab ! col `as` col

435instance

483instance

436 ( Has tab (Join outer from) row0

484 ( Has tab (Join outer from) row0

@@ -438,11 +486,11 @@ instance

438 , row1 ~ '[col ::: ty]

486 , row1 ~ '[col ::: ty]

439 , GroupedBy tab col bys )

487 , GroupedBy tab col bys )

440 => IsQualified tab col

488 => IsQualified tab col

441− (Selection outer ('Grouped bys) commons schemas params from row1) where

489+ (Selection outer commons ('Grouped bys) schemas params from row1) where

442 tab ! col = tab ! col `as` col

490 tab ! col = tab ! col `as` col

443instance (HasUnique tab (Join outer from) row0, Has col row0 ty, row1 ~ '[col ::: ty])

491instance (HasUnique tab (Join outer from) row0, Has col row0 ty, row1 ~ '[col ::: ty])

444 => IsLabel col

492 => IsLabel col

445− (Selection outer 'Ungrouped commons schemas params from row1) where

493+ (Selection outer commons 'Ungrouped schemas params from row1) where

446 fromLabel = fromLabel @col `as` Alias

494 fromLabel = fromLabel @col `as` Alias

447instance

495instance

448 ( HasUnique tab (Join outer from) row0

496 ( HasUnique tab (Join outer from) row0

@@ -450,10 +498,10 @@ instance

450 , row1 ~ '[col ::: ty]

498 , row1 ~ '[col ::: ty]

451 , GroupedBy tab col bys )

499 , GroupedBy tab col bys )

452 => IsLabel col

500 => IsLabel col

453− (Selection outer ('Grouped bys) commons schemas params from row1) where

501+ (Selection outer commons ('Grouped bys) schemas params from row1) where

454 fromLabel = fromLabel @col `as` Alias

502 fromLabel = fromLabel @col `as` Alias

455

503

456−instance RenderSQL (Selection outer grp commons schemas params from row) where

504+instance RenderSQL (Selection outer commons grp schemas params from row) where

457 renderSQL = \case

505 renderSQL = \case

458 List list -> renderCommaSeparated (renderAliased renderSQL) list

506 List list -> renderCommaSeparated (renderAliased renderSQL) list

459 Star -> "*"

507 Star -> "*"

@@ -462,7 +510,7 @@ instance RenderSQL (Selection outer grp commons schemas params from row) where

462 Over winFns winDef ->

510 Over winFns winDef ->

463 let

511 let

464 renderOver

512 renderOver

465− :: Aliased (WindowFunction outer grp commons schemas params from) field

513+ :: Aliased (WindowFunction outer commons grp schemas params from) field

466 -> ByteString

514 -> ByteString

467 renderOver (winFn `As` col) = renderSQL winFn

515 renderOver (winFn `As` col) = renderSQL winFn

468 <+> "OVER" <+> parenthesized (renderSQL winDef)

516 <+> "OVER" <+> parenthesized (renderSQL winDef)

@@ -471,7 +519,7 @@ instance RenderSQL (Selection outer grp commons schemas params from row) where

471 renderCommaSeparated renderOver winFns

519 renderCommaSeparated renderOver winFns

472

520

473instance IsString

521instance IsString

474− (Selection outer grp commons schemas params from '["fromOnly" ::: 'NotNull 'PGtext]) where

522+ (Selection outer commons grp schemas params from '["fromOnly" ::: 'NotNull 'PGtext]) where

475 fromString str = fromString str `as` Alias

523 fromString str = fromString str `as` Alias

476

524

477-- | the `TableExpression` in the `select` command constructs an intermediate

525-- | the `TableExpression` in the `select` command constructs an intermediate

@@ -481,9 +529,9 @@ instance IsString

481-- the intermediate table are actually output.

529-- the intermediate table are actually output.

482select

530select

483 :: (SListI row, row ~ (x ': xs))

531 :: (SListI row, row ~ (x ': xs))

484− => Selection outer grp commons schemas params from row

532+ => Selection outer commons grp schemas params from row

485− -- ^ select list

533+ -- ^ selection

486− -> TableExpression outer grp commons schemas params from

534+ -> TableExpression outer commons grp schemas params from

487 -- ^ intermediate virtual table

535 -- ^ intermediate virtual table

488 -> Query outer commons schemas params row

536 -> Query outer commons schemas params row

489select selection tabexpr = UnsafeQuery $

537select selection tabexpr = UnsafeQuery $

@@ -491,20 +539,24 @@ select selection tabexpr = UnsafeQuery $

491 <+> renderSQL selection

539 <+> renderSQL selection

492 <+> renderSQL tabexpr

540 <+> renderSQL tabexpr

493

541

542+-- | Like `select` but takes an `NP` list of `Expression`s instead

543+-- of a general `Selection`.

494select_

544select_

495 :: (SListI row, row ~ (x ': xs))

545 :: (SListI row, row ~ (x ': xs))

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

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

547+ -- ^ select list

497− -> TableExpression outer grp commons schemas params from

548+ -> TableExpression outer commons grp schemas params from

549+ -- ^ intermediate virtual table

498 -> Query outer commons schemas params row

550 -> Query outer commons schemas params row

499−select_ list = select (List list)

551+select_ = select . List

500

552

501-- | After the select list has been processed, the result table can

553-- | After the select list has been processed, the result table can

502-- be subject to the elimination of duplicate rows using `selectDistinct`.

554-- be subject to the elimination of duplicate rows using `selectDistinct`.

503selectDistinct

555selectDistinct

504 :: (SListI columns, columns ~ (col ': cols))

556 :: (SListI columns, columns ~ (col ': cols))

505− => Selection outer 'Ungrouped commons schemas params from columns

557+ => Selection outer commons grp schemas params from columns

506− -- ^ select list

558+ -- ^ selection

507− -> TableExpression outer 'Ungrouped commons schemas params from

559+ -> TableExpression outer commons grp schemas params from

508 -- ^ intermediate virtual table

560 -- ^ intermediate virtual table

509 -> Query outer commons schemas params columns

561 -> Query outer commons schemas params columns

510selectDistinct selection tabexpr = UnsafeQuery $

562selectDistinct selection tabexpr = UnsafeQuery $

@@ -512,14 +564,65 @@ selectDistinct selection tabexpr = UnsafeQuery $

512 <+> renderSQL selection

564 <+> renderSQL selection

513 <+> renderSQL tabexpr

565 <+> renderSQL tabexpr

514

566

567+-- | Like `selectDistinct` but takes an `NP` list of `Expression`s instead

568+-- of a general `Selection`.

515selectDistinct_

569selectDistinct_

516 :: (SListI columns, columns ~ (col ': cols))

570 :: (SListI columns, columns ~ (col ': cols))

517− => NP (Aliased (Expression outer 'Ungrouped commons schemas params from)) columns

571+ => NP (Aliased (Expression outer commons grp schemas params from)) columns

518 -- ^ select list

572 -- ^ select list

519− -> TableExpression outer 'Ungrouped commons schemas params from

573+ -> TableExpression outer commons grp schemas params from

574+ -- ^ intermediate virtual table

575+ -> Query outer commons schemas params columns

576+selectDistinct_ = selectDistinct . List

577+

578+{-|

579+`selectDistinctOn` keeps only the first row of each set of rows where

580+the given expressions evaluate to equal. The DISTINCT ON expressions are

581+interpreted using the same rules as for ORDER BY. ORDER BY is used to

582+ensure that the desired row appears first.

583+

584+The DISTINCT ON expression(s) must match the leftmost ORDER BY expression(s).

585+The ORDER BY clause will normally contain additional expression(s) that

586+determine the desired precedence of rows within each DISTINCT ON group.

587+

588+In order to guarantee they match and reduce redundancy, this function

589+will prepend the The DISTINCT ON expressions to the ORDER BY clause.

590+-}

591+selectDistinctOn

592+ :: (SListI columns, columns ~ (col ': cols))

593+ => [SortExpression outer commons grp schemas params from]

594+ -- ^ DISTINCT ON expression(s) and prepended to ORDER BY clause

595+ -> Selection outer commons grp schemas params from columns

596+ -- ^ selection

597+ -> TableExpression outer commons grp schemas params from

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

520 -- ^ intermediate virtual table

623 -- ^ intermediate virtual table

521 -> Query outer commons schemas params columns

624 -> Query outer commons schemas params columns

522−selectDistinct_ list = select (List list)

625+selectDistinctOn_ distincts = selectDistinctOn distincts . List

523

626

524-- | `values` computes a row value or set of row values

627-- | `values` computes a row value or set of row values

525-- specified by value expressions. It is most commonly used

628-- specified by value expressions. It is most commonly used

@@ -532,8 +635,8 @@ selectDistinct_ list = select (List list)

532-- SELECT * FROM (VALUES (1, E'one')) AS t ("a", "b")

635-- SELECT * FROM (VALUES (1, E'one')) AS t ("a", "b")

533values

636values

534 :: SListI cols

637 :: SListI cols

535− => NP (Aliased (Expression outer 'Ungrouped commons schemas params '[] )) 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 -- ^ When more than one row is specified, all the rows must

640 -- ^ When more than one row is specified, all the rows must

538 -- must have the same number of elements

641 -- must have the same number of elements

539 -> Query outer commons schemas params cols

642 -> Query outer commons schemas params cols

@@ -547,7 +650,7 @@ values rw rws = UnsafeQuery $ "SELECT * FROM"

547 <+> parenthesized (renderCommaSeparated renderAliasPart rw)

650 <+> parenthesized (renderCommaSeparated renderAliasPart rw)

548 where

651 where

549 renderAliasPart, renderValuePart

652 renderAliasPart, renderValuePart

550− :: Aliased (Expression outer 'Ungrouped commons schemas params '[] ) ty -> ByteString

653+ :: Aliased (Expression outer commons 'Ungrouped schemas params '[] ) ty -> ByteString

551 renderAliasPart (_ `As` name) = renderSQL name

654 renderAliasPart (_ `As` name) = renderSQL name

552 renderValuePart (value `As` _) = renderSQL value

655 renderValuePart (value `As` _) = renderSQL value

553

656

@@ -555,7 +658,7 @@ values rw rws = UnsafeQuery $ "SELECT * FROM"

555-- specified by value expressions.

658-- specified by value expressions.

556values_

659values_

557 :: SListI cols

660 :: SListI cols

558− => NP (Aliased (Expression outer 'Ungrouped commons schemas params '[] )) cols

661+ => NP (Aliased (Expression outer commons 'Ungrouped schemas params '[] )) cols

559 -- ^ one row of values

662 -- ^ one row of values

560 -> Query outer commons schemas params cols

663 -> Query outer commons schemas params cols

561values_ rw = values rw []

664values_ rw = values rw []

@@ -572,8 +675,8 @@ Table Expressions

572-- can be used to modify or combine base tables in various ways.

675-- can be used to modify or combine base tables in various ways.

573data TableExpression

676data TableExpression

574 (outer :: FromType)

677 (outer :: FromType)

575− (grp :: Grouping)

576 (commons :: FromType)

678 (commons :: FromType)

679+ (grp :: Grouping)

577 (schemas :: SchemasType)

680 (schemas :: SchemasType)

578 (params :: [NullityType])

681 (params :: [NullityType])

579 (from :: FromType)

682 (from :: FromType)

@@ -581,7 +684,7 @@ data TableExpression

581 { fromClause :: FromClause outer commons schemas params from

684 { fromClause :: FromClause outer commons schemas params from

582 -- ^ A table reference that can be a table name, or a derived table such

685 -- ^ A table reference that can be a table name, or a derived table such

583 -- as a subquery, a @JOIN@ construct, or complex combinations of these.

686 -- as a subquery, a @JOIN@ construct, or complex combinations of these.

584− , whereClause :: [Condition outer 'Ungrouped commons schemas params from]

687+ , whereClause :: [Condition outer commons 'Ungrouped schemas params from]

585 -- ^ optional search coditions, combined with `.&&`. After the processing

688 -- ^ optional search coditions, combined with `.&&`. After the processing

586 -- of the `fromClause` is done, each row of the derived virtual table

689 -- of the `fromClause` is done, each row of the derived virtual table

587 -- is checked against the search condition. If the result of the

690 -- is checked against the search condition. If the result of the

@@ -597,13 +700,13 @@ data TableExpression

597 -- set of rows having common values into one group row that represents all

700 -- set of rows having common values into one group row that represents all

598 -- rows in the group. This is done to eliminate redundancy in the output

701 -- rows in the group. This is done to eliminate redundancy in the output

599 -- and/or compute aggregates that apply to these groups.

702 -- and/or compute aggregates that apply to these groups.

600− , havingClause :: HavingClause outer grp commons schemas params from

703+ , havingClause :: HavingClause outer commons grp schemas params from

601 -- ^ If a table has been grouped using `groupBy`, but only certain groups

704 -- ^ If a table has been grouped using `groupBy`, but only certain groups

602 -- are of interest, the `havingClause` can be used, much like a

705 -- are of interest, the `havingClause` can be used, much like a

603 -- `whereClause`, to eliminate groups from the result. Expressions in the

706 -- `whereClause`, to eliminate groups from the result. Expressions in the

604 -- `havingClause` can refer both to grouped expressions and to ungrouped

707 -- `havingClause` can refer both to grouped expressions and to ungrouped

605 -- expressions (which necessarily involve an aggregate function).

708 -- expressions (which necessarily involve an aggregate function).

606− , orderByClause :: [SortExpression outer grp commons schemas params from]

709+ , orderByClause :: [SortExpression outer commons grp schemas params from]

607 -- ^ The `orderByClause` is for optional sorting. When more than one

710 -- ^ The `orderByClause` is for optional sorting. When more than one

608 -- `SortExpression` is specified, the later (right) values are used to sort

711 -- `SortExpression` is specified, the later (right) values are used to sort

609 -- rows that are equal according to the earlier (left) values.

712 -- rows that are equal according to the earlier (left) values.

@@ -620,7 +723,7 @@ data TableExpression

620 } deriving (GHC.Generic)

723 } deriving (GHC.Generic)

621

724

622-- | Render a `TableExpression`

725-- | Render a `TableExpression`

623−instance RenderSQL (TableExpression outer grp commons schemas params from) where

726+instance RenderSQL (TableExpression outer commons grp schemas params from) where

624 renderSQL

727 renderSQL

625 (TableExpression frm' whs' grps' hvs' srts' lims' offs') = mconcat

728 (TableExpression frm' whs' grps' hvs' srts' lims' offs') = mconcat

626 [ "FROM ", renderSQL frm'

729 [ "FROM ", renderSQL frm'

@@ -653,29 +756,29 @@ instance RenderSQL (TableExpression outer grp commons schemas params from) where

653-- to match the left-to-right sequencing of their placement in SQL.

756-- to match the left-to-right sequencing of their placement in SQL.

654from

757from

655 :: FromClause outer commons schemas params from -- ^ table reference

758 :: FromClause outer commons schemas params from -- ^ table reference

656− -> TableExpression outer 'Ungrouped commons schemas params from

759+ -> TableExpression outer commons 'Ungrouped schemas params from

657−from tab = TableExpression tab [] NoGroups NoHaving [] [] []

760+from tab = TableExpression tab [] noGroups NoHaving [] [] []

658

761

659-- | A `where_` is an endomorphism of `TableExpression`s which adds a

762-- | A `where_` is an endomorphism of `TableExpression`s which adds a

660-- search condition to the `whereClause`.

763-- search condition to the `whereClause`.

661where_

764where_

662− :: Condition outer 'Ungrouped commons schemas params from -- ^ filtering condition

765+ :: Condition outer commons 'Ungrouped schemas params from -- ^ filtering condition

663− -> TableExpression outer grp commons schemas params from

766+ -> TableExpression outer commons grp schemas params from

664− -> TableExpression outer grp commons schemas params from

767+ -> TableExpression outer commons grp schemas params from

665where_ wh rels = rels {whereClause = wh : whereClause rels}

768where_ wh rels = rels {whereClause = wh : whereClause rels}

666

769

667-- | A `groupBy` is a transformation of `TableExpression`s which switches

770-- | A `groupBy` is a transformation of `TableExpression`s which switches

668−-- its `Grouping` from `Ungrouped` to `Grouped`. Use @group Nil@ to perform

771+-- its `Grouping` from `Ungrouped` to `Grouped`. Use @groupBy Nil@ to perform

669-- a "grand total" aggregation query.

772-- a "grand total" aggregation query.

670groupBy

773groupBy

671 :: SListI bys

774 :: SListI bys

672 => NP (By from) bys -- ^ grouped columns

775 => NP (By from) bys -- ^ grouped columns

673− -> TableExpression outer 'Ungrouped commons schemas params from

776+ -> TableExpression outer commons 'Ungrouped schemas params from

674− -> TableExpression outer ('Grouped bys) commons schemas params from

777+ -> TableExpression outer commons ('Grouped bys) schemas params from

675groupBy bys rels = TableExpression

778groupBy bys rels = TableExpression

676 { fromClause = fromClause rels

779 { fromClause = fromClause rels

677 , whereClause = whereClause rels

780 , whereClause = whereClause rels

678− , groupByClause = Group bys

781+ , groupByClause = group bys

679 , havingClause = Having []

782 , havingClause = Having []

680 , orderByClause = []

783 , orderByClause = []

681 , limitClause = limitClause rels

784 , limitClause = limitClause rels

@@ -685,9 +788,9 @@ groupBy bys rels = TableExpression

685-- | A `having` is an endomorphism of `TableExpression`s which adds a

788-- | A `having` is an endomorphism of `TableExpression`s which adds a

686-- search condition to the `havingClause`.

789-- search condition to the `havingClause`.

687having

790having

688− :: Condition outer ('Grouped bys) commons schemas params from -- ^ having condition

791+ :: Condition outer commons ('Grouped bys) schemas params from -- ^ having condition

689− -> TableExpression outer ('Grouped bys) commons schemas params from

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

691having hv rels = rels

794having hv rels = rels

692 { havingClause = case havingClause rels of Having hvs -> Having (hv:hvs) }

795 { havingClause = case havingClause rels of Having hvs -> Having (hv:hvs) }

693

796

@@ -698,165 +801,18 @@ instance OrderBy TableExpression where

698-- `limitClause`.

801-- `limitClause`.

699limit

802limit

700 :: Word64 -- ^ limit parameter

803 :: Word64 -- ^ limit parameter

701− -> TableExpression outer grp commons schemas params from

804+ -> TableExpression outer commons grp schemas params from

702− -> TableExpression outer grp commons schemas params from

805+ -> TableExpression outer commons grp schemas params from

703limit lim rels = rels {limitClause = lim : limitClause rels}

806limit lim rels = rels {limitClause = lim : limitClause rels}

704

807

705-- | An `offset` is an endomorphism of `TableExpression`s which adds to the

808-- | An `offset` is an endomorphism of `TableExpression`s which adds to the

706-- `offsetClause`.

809-- `offsetClause`.

707offset

810offset

708 :: Word64 -- ^ offset parameter

811 :: Word64 -- ^ offset parameter

709− -> TableExpression outer grp commons schemas params from

812+ -> TableExpression outer commons grp schemas params from

710− -> TableExpression outer grp commons schemas params from

813+ -> TableExpression outer commons grp schemas params from

711offset off rels = rels {offsetClause = off : offsetClause rels}

814offset off rels = rels {offsetClause = off : offsetClause rels}

712

815

713−{-----------------------------------------

714−JSON stuff

715−-----------------------------------------}

716−

717−unsafeSetOfFunction

718− :: ByteString

719− -> Expression outer 'Ungrouped commons schemas params '[] ty

720− -> Query outer commons schemas params row

721−unsafeSetOfFunction fun expr = UnsafeQuery $

722− "SELECT * FROM " <> fun <> "(" <> renderSQL expr <> ")"

723−

724−-- | Expand an array to a set of rows

725−unnest

726− :: Expression outer 'Ungrouped commons schemas params '[] (nullity ('PGvararray ty))

727− -> Query outer commons schemas params '[ "unnest" ::: ty ]

728−unnest = unsafeSetOfFunction "unnest"

729−

730−-- | Expands the outermost JSON object into a set of key/value pairs.

731−jsonEach

732− :: Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjson) -- ^ json object

733− -> Query outer commons schemas params

734− '["key" ::: 'NotNull 'PGtext, "value" ::: 'NotNull 'PGjson]

735−jsonEach = unsafeSetOfFunction "json_each"

736−

737−-- | Expands the outermost binary JSON object into a set of key/value pairs.

738−jsonbEach

739− :: Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjsonb) -- ^ jsonb object

740− -> Query outer commons schemas params

741− '["key" ::: 'NotNull 'PGtext, "value" ::: 'NotNull 'PGjsonb]

742−jsonbEach = unsafeSetOfFunction "jsonb_each"

743−

744−-- | Expands the outermost JSON object into a set of key/value pairs.

745−jsonEachAsText

746− :: Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjson) -- ^ json object

747− -> Query outer commons schemas params

748− '["key" ::: 'NotNull 'PGtext, "value" ::: 'NotNull 'PGtext]

749−jsonEachAsText = unsafeSetOfFunction "json_each_text"

750−

751−-- | Expands the outermost binary JSON object into a set of key/value pairs.

752−jsonbEachAsText

753− :: Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjsonb) -- ^ jsonb object

754− -> Query outer commons schemas params

755− '["key" ::: 'NotNull 'PGtext, "value" ::: 'NotNull 'PGtext]

756−jsonbEachAsText = unsafeSetOfFunction "jsonb_each_text"

757−

758−-- | Returns set of keys in the outermost JSON object.

759−jsonObjectKeys

760− :: Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjson) -- ^ json object

761− -> Query outer commons schemas params '["json_object_keys" ::: 'NotNull 'PGtext]

762−jsonObjectKeys = unsafeSetOfFunction "json_object_keys"

763−

764−-- | Returns set of keys in the outermost JSON object.

765−jsonbObjectKeys

766− :: Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjsonb) -- ^ jsonb object

767− -> Query outer commons schemas params '["jsonb_object_keys" ::: 'NotNull 'PGtext]

768−jsonbObjectKeys = unsafeSetOfFunction "jsonb_object_keys"

769−

770−unsafePopulateFunction

771− :: ByteString

772− -> TypeExpression schemas (nullity ('PGcomposite row))

773− -> Expression outer 'Ungrouped commons schemas params '[] ty

774− -> Query outer commons schemas params row

775−unsafePopulateFunction fun ty expr = UnsafeQuery $

776− "SELECT * FROM " <> fun <> "("

777− <> "null::" <> renderSQL ty <> ", "

778− <> renderSQL expr <> ")"

779−

780−-- | Expands the JSON expression to a row whose columns match the record

781−-- type defined by the given table.

782−jsonPopulateRecord

783− :: TypeExpression schemas (nullity ('PGcomposite row)) -- ^ row type

784− -> Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjson) -- ^ json object

785− -> Query outer commons schemas params row

786−jsonPopulateRecord = unsafePopulateFunction "json_populate_record"

787−

788−-- | Expands the binary JSON expression to a row whose columns match the record

789−-- type defined by the given table.

790−jsonbPopulateRecord

791− :: TypeExpression schemas (nullity ('PGcomposite row)) -- ^ row type

792− -> Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjsonb) -- ^ jsonb object

793− -> Query outer commons schemas params row

794−jsonbPopulateRecord = unsafePopulateFunction "jsonb_populate_record"

795−

796−-- | Expands the outermost array of objects in the given JSON expression to a

797−-- set of rows whose columns match the record type defined by the given table.

798−jsonPopulateRecordSet

799− :: TypeExpression schemas (nullity ('PGcomposite row)) -- ^ row type

800− -> Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjson) -- ^ json array

801− -> Query outer commons schemas params row

802−jsonPopulateRecordSet = unsafePopulateFunction "json_populate_record_set"

803−

804−-- | Expands the outermost array of objects in the given binary JSON expression

805−-- to a set of rows whose columns match the record type defined by the given

806−-- table.

807−jsonbPopulateRecordSet

808− :: TypeExpression schemas (nullity ('PGcomposite row)) -- ^ row type

809− -> Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjsonb) -- ^ jsonb array

810− -> Query outer commons schemas params row

811−jsonbPopulateRecordSet = unsafePopulateFunction "jsonb_populate_record_set"

812−

813−unsafeRecordFunction

814− :: (SListI record, json `In` PGJsonType)

815− => ByteString

816− -> Expression outer 'Ungrouped commons schemas params '[] (nullity json)

817− -> NP (Aliased (TypeExpression schemas)) record

818− -> Query outer commons schemas params record

819−unsafeRecordFunction fun expr types = UnsafeQuery $

820− "SELECT * FROM " <> fun <> "("

821− <> renderSQL expr <> ")"

822− <+> "AS" <+> "x" <> parenthesized (renderCommaSeparated renderTy types)

823− where

824− renderTy :: Aliased (TypeExpression schemas) ty -> ByteString

825− renderTy (ty `As` alias) =

826− renderSQL alias <+> renderSQL ty

827−

828−-- | Builds an arbitrary record from a JSON object.

829−jsonToRecord

830− :: SListI record

831− => Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjson) -- ^ json object

832− -> NP (Aliased (TypeExpression schemas)) record -- ^ record types

833− -> Query outer commons schemas params record

834−jsonToRecord = unsafeRecordFunction "json_to_record"

835−

836−-- | Builds an arbitrary record from a binary JSON object.

837−jsonbToRecord

838− :: SListI record

839− => Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjsonb) -- ^ jsonb object

840− -> NP (Aliased (TypeExpression schemas)) record -- ^ record types

841− -> Query outer commons schemas params record

842−jsonbToRecord = unsafeRecordFunction "jsonb_to_record"

843−

844−-- | Builds an arbitrary set of records from a JSON array of objects.

845−jsonToRecordSet

846− :: SListI record

847− => Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjson) -- ^ json array

848− -> NP (Aliased (TypeExpression schemas)) record -- ^ record types

849− -> Query outer commons schemas params record

850−jsonToRecordSet = unsafeRecordFunction "json_to_record_set"

851−

852−-- | Builds an arbitrary set of records from a binary JSON array of objects.

853−jsonbToRecordSet

854− :: SListI record

855− => Expression outer 'Ungrouped commons schemas params '[] (nullity 'PGjsonb) -- ^ jsonb array

856− -> NP (Aliased (TypeExpression schemas)) record -- ^ record types

857− -> Query outer commons schemas params record

858−jsonbToRecordSet = unsafeRecordFunction "jsonb_to_record_set"

859−

860{-----------------------------------------

816{-----------------------------------------

861FROM clauses

817FROM clauses

862-----------------------------------------}

818-----------------------------------------}

@@ -883,7 +839,7 @@ table (tab `As` alias) = UnsafeFromClause $

883subquery

839subquery

884 :: Aliased (Query outer commons schemas params) query

840 :: Aliased (Query outer commons schemas params) query

885 -> FromClause outer commons schemas params '[query]

841 -> FromClause outer commons schemas params '[query]

886−subquery = UnsafeFromClause . renderAliased (parenthesized . renderQuery)

842+subquery = UnsafeFromClause . renderAliased (parenthesized . renderSQL)

887

843

888-- | `view` derives a table from a `View`.

844-- | `view` derives a table from a `View`.

889view

845view

@@ -901,11 +857,16 @@ common

901common (cte `As` alias) = UnsafeFromClause $

857common (cte `As` alias) = UnsafeFromClause $

902 renderSQL cte <+> "AS" <+> renderSQL alias

858 renderSQL cte <+> "AS" <+> renderSQL alias

903

859

860+instance Additional (FromClause outer commons schemas params) where

861+ also right left = UnsafeFromClause $

862+ renderSQL left <> ", " <> renderSQL right

863+

864+{- |

904−{- | @left & crossJoin right@. For every possible combination of rows from

865+@left & crossJoin right@. For every possible combination of rows from

905− @left@ and @right@ (i.e., a Cartesian product), the joined table will contain

866+@left@ and @right@ (i.e., a Cartesian product), the joined table will contain

906− a row consisting of all columns in @left@ followed by all columns in @right@.

867+a row consisting of all columns in @left@ followed by all columns in @right@.

907− If the tables have @n@ and @m@ rows respectively, the joined table will

868+If the tables have @n@ and @m@ rows respectively, the joined table will

908− have @n * m@ rows.

869+have @n * m@ rows.

909-}

870-}

910crossJoin

871crossJoin

911 :: FromClause outer commons schemas params right

872 :: FromClause outer commons schemas params right

@@ -922,7 +883,7 @@ the @on@ condition.

922innerJoin

883innerJoin

923 :: FromClause outer commons schemas params right

884 :: FromClause outer commons schemas params right

924 -- ^ right

885 -- ^ right

925− -> Condition outer 'Ungrouped commons schemas params (Join left right)

886+ -> Condition outer commons 'Ungrouped schemas params (Join left right)

926 -- ^ @on@ condition

887 -- ^ @on@ condition

927 -> FromClause outer commons schemas params left

888 -> FromClause outer commons schemas params left

928 -- ^ left

889 -- ^ left

@@ -939,7 +900,7 @@ innerJoin right on left = UnsafeFromClause $

939leftOuterJoin

900leftOuterJoin

940 :: FromClause outer commons schemas params right

901 :: FromClause outer commons schemas params right

941 -- ^ right

902 -- ^ right

942− -> Condition outer 'Ungrouped commons schemas params (Join left right)

903+ -> Condition outer commons 'Ungrouped schemas params (Join left right)

943 -- ^ @on@ condition

904 -- ^ @on@ condition

944 -> FromClause outer commons schemas params left

905 -> FromClause outer commons schemas params left

945 -- ^ left

906 -- ^ left

@@ -957,7 +918,7 @@ leftOuterJoin right on left = UnsafeFromClause $

957rightOuterJoin

918rightOuterJoin

958 :: FromClause outer commons schemas params right

919 :: FromClause outer commons schemas params right

959 -- ^ right

920 -- ^ right

960− -> Condition outer 'Ungrouped commons schemas params (Join left right)

921+ -> Condition outer commons 'Ungrouped schemas params (Join left right)

961 -- ^ @on@ condition

922 -- ^ @on@ condition

962 -> FromClause outer commons schemas params left

923 -> FromClause outer commons schemas params left

963 -- ^ left

924 -- ^ left

@@ -976,7 +937,7 @@ rightOuterJoin right on left = UnsafeFromClause $

976fullOuterJoin

937fullOuterJoin

977 :: FromClause outer commons schemas params right

938 :: FromClause outer commons schemas params right

978 -- ^ right

939 -- ^ right

979− -> Condition outer 'Ungrouped commons schemas params (Join left right)

940+ -> Condition outer commons 'Ungrouped schemas params (Join left right)

980 -- ^ @on@ condition

941 -- ^ @on@ condition

981 -> FromClause outer commons schemas params left

942 -> FromClause outer commons schemas params left

982 -- ^ left

943 -- ^ left

@@ -1031,131 +992,42 @@ instance (Has rel rels cols, Has col cols ty, bys ~ '[ '(rel, col)])

1031-- done on @NoGroups@ while all output `Expression`s must be aggregated

992-- done on @NoGroups@ while all output `Expression`s must be aggregated

1032-- in @Group Nil@. In general, all output `Expression`s in the

993-- in @Group Nil@. In general, all output `Expression`s in the

1033-- complement of @bys@ must be aggregated in @Group bys@.

994-- complement of @bys@ must be aggregated in @Group bys@.

1034−data GroupByClause grp from where

995+newtype GroupByClause grp from = UnsafeGroupByClause

1035− NoGroups :: GroupByClause 'Ungrouped from

996+ { renderGroupByClause :: ByteString }

1036− Group

997+ deriving (GHC.Generic,Show,Eq,Ord,NFData)

1037− :: SListI bys

1038− => NP (By from) bys

1039− -> GroupByClause ('Grouped bys) from

1040−

1041−-- | Renders a `GroupByClause`.

1042instance RenderSQL (GroupByClause grp from) where

998instance RenderSQL (GroupByClause grp from) where

1043− renderSQL = \case

999+ renderSQL = renderGroupByClause

1044− NoGroups -> ""

1000+noGroups :: GroupByClause 'Ungrouped from

1001+noGroups = UnsafeGroupByClause ""

1002+group

1003+ :: SListI bys

1004+ => NP (By from) bys

1005+ -> GroupByClause ('Grouped bys) from

1006+group bys = UnsafeGroupByClause $ case bys of

1045− Group Nil -> ""

1007+ Nil -> ""

1046− Group bys -> " GROUP BY" <+> renderCommaSeparated renderSQL bys

1008+ bys' -> " GROUP BY" <+> renderCommaSeparated renderSQL bys'

1047

1009

1048-- | A `HavingClause` is used to eliminate groups that are not of interest.

1010-- | A `HavingClause` is used to eliminate groups that are not of interest.

1049-- An `Ungrouped` `TableExpression` may only use `NoHaving` while a `Grouped`

1011-- An `Ungrouped` `TableExpression` may only use `NoHaving` while a `Grouped`

1050-- `TableExpression` must use `Having` whose conditions are combined with

1012-- `TableExpression` must use `Having` whose conditions are combined with

1051-- `.&&`.

1013-- `.&&`.

1052−data HavingClause outer grp commons schemas params from where

1014+data HavingClause outer commons grp schemas params from where

1053− NoHaving :: HavingClause outer 'Ungrouped commons schemas params from

1015+ NoHaving :: HavingClause outer commons 'Ungrouped schemas params from

1054 Having

1016 Having

1055− :: [Condition outer ('Grouped bys) commons schemas params from]

1017+ :: [Condition outer commons ('Grouped bys) schemas params from]

1056− -> HavingClause outer ('Grouped bys) commons schemas params from

1018+ -> HavingClause outer commons ('Grouped bys) schemas params from

1057−deriving instance Show (HavingClause outer grp commons schemas params from)

1019+deriving instance Show (HavingClause outer commons grp schemas params from)

1058−deriving instance Eq (HavingClause outer grp commons schemas params from)

1020+deriving instance Eq (HavingClause outer commons grp schemas params from)

1059−deriving instance Ord (HavingClause outer grp commons schemas params from)

1021+deriving instance Ord (HavingClause outer commons grp schemas params from)

1060

1022

1061-- | Render a `HavingClause`.

1023-- | Render a `HavingClause`.

1062−instance RenderSQL (HavingClause outer grp commons schemas params from) where

1024+instance RenderSQL (HavingClause outer commons grp schemas params from) where

1063 renderSQL = \case

1025 renderSQL = \case

1064 NoHaving -> ""

1026 NoHaving -> ""

1065 Having [] -> ""

1027 Having [] -> ""

1066 Having conditions ->

1028 Having conditions ->

1067 " HAVING" <+> commaSeparated (renderSQL <$> conditions)

1029 " HAVING" <+> commaSeparated (renderSQL <$> conditions)

1068

1030

1069−{- |

1070−The argument of `exists` is an arbitrary subquery. The subquery is evaluated

1071−to determine whether it returns any rows. If it returns at least one row,

1072−the result of `exists` is `true`; if the subquery returns no rows,

1073−the result of `exists` is `false`.

1074−

1075−The subquery can refer to variables from the surrounding query,

1076−which will act as constants during any one evaluation of the subquery.

1077−

1078−The subquery will generally only be executed long enough to determine whether

1079−at least one row is returned, not all the way to completion.

1080−-}

1081−exists

1082− :: Query (Join outer from) commons schemas params row

1083− -> Condition outer grp commons schemas params from

1084−exists query = UnsafeExpression $ "EXISTS" <+> parenthesized (renderSQL query)

1085−

1086−type Operator ty1 ty2 ty3

1087− = forall outer grp commons schemas params from

1088− . Expression outer grp commons schemas params from ty1

1089− -> Expression outer grp commons schemas params from ty2

1090− -> Expression outer grp commons schemas params from ty3

1091−

1092−{- |

1093−The right-hand side is a parenthesized subquery, which must return

1094−exactly one column. The left-hand expression is evaluated and compared to each

1095−row of the subquery result using the given `Operator`,

1096−which must yield a Boolean result. The result of `subAll` is `true`

1097−if all rows yield true (including the case where the subquery returns no rows).

1098−The result is `false` if any `false` result is found.

1099−The result is `null_` if no comparison with a subquery row returns `false`,

1100−and at least one comparison returns `null_`.

1101−

1102−>>> printSQL $ subAll true (.==) (values_ (true `as` #foo))

1103−(TRUE = ALL (SELECT * FROM (VALUES (TRUE)) AS t ("foo")))

1104−-}

1105−subAll

1106− :: Expression outer grp commons schemas params from ty1 -- ^ expression

1107− -> Operator ty1 ty2 ('Null 'PGbool) -- ^ operator

1108− -> Query (Join outer from) commons schemas params '[col ::: ty2] -- ^ subquery

1109− -> Condition outer grp commons schemas params from

1110−subAll expr (?) qry = expr ?

1111− (UnsafeExpression $ "ALL" <+> parenthesized (renderSQL qry))

1112−

1113−{- |

1114−The right-hand side is a parenthesized subquery, which must return exactly one column.

1115−The left-hand expression is evaluated and compared to each row of the subquery result

1116−using the given `Operator`, which must yield a Boolean result. The result of `subAny` is `true`

1117−if any `true` result is obtained. The result is `false` if no true result is found

1118−(including the case where the subquery returns no rows).

1119−

1120−>>> printSQL $ subAll "foo" like (values_ ("foobar" `as` #foo))

1121−(E'foo' LIKE ALL (SELECT * FROM (VALUES (E'foobar')) AS t ("foo")))

1122−-}

1123−subAny

1124− :: Expression outer grp commons schemas params from ty1 -- ^ expression

1125− -> Operator ty1 ty2 ('Null 'PGbool) -- ^ operator

1126− -> Query (Join outer from) commons schemas params '[col ::: ty2] -- ^ subquery

1127− -> Condition outer grp commons schemas params from

1128−subAny expr (?) qry = expr ?

1129− (UnsafeExpression $ "ANY" <+> parenthesized (renderSQL qry))

1130−

1131−{- |

1132−The result is `true` if the left-hand expression's result is equal

1133−to any of the right-hand expressions.

1134−

1135−>>> printSQL $ true `in_` [true, false, null_]

1136−TRUE IN (TRUE, FALSE, NULL)

1137−-}

1138−in_

1139− :: Expression outer grp commons schemas params from ty -- ^ expression

1140− -> [Expression outer grp commons schemas params from ty]

1141− -> Condition outer grp commons schemas params from

1142−expr `in_` exprs = UnsafeExpression $ renderSQL expr <+> "IN"

1143− <+> parenthesized (commaSeparated (renderSQL <$> exprs))

1144−

1145−{- |

1146−The result is `true` if the left-hand expression's result is not equal

1147−to any of the right-hand expressions.

1148−

1149−>>> printSQL $ true `notIn` [false, null_]

1150−TRUE NOT IN (FALSE, NULL)

1151−-}

1152−notIn

1153− :: Expression outer grp commons schemas params from ty -- ^ expression

1154− -> [Expression outer grp commons schemas params from ty]

1155− -> Condition outer grp commons schemas params from

1156−expr `notIn` exprs = UnsafeExpression $ renderSQL expr <+> "NOT IN"

1157− <+> parenthesized (commaSeparated (renderSQL <$> exprs))

1158−

1159-- | A `CommonTableExpression` is an auxiliary statement in a `with` clause.

1031-- | A `CommonTableExpression` is an auxiliary statement in a `with` clause.

1160data CommonTableExpression statement

1032data CommonTableExpression statement

1161 (schemas :: SchemasType)

1033 (schemas :: SchemasType)

@@ -1177,8 +1049,8 @@ instance

1177 , commons1 ~ (cte ::: common ': commons)

1049 , commons1 ~ (cte ::: common ': commons)

1178 ) => Aliasable cte

1050 ) => Aliasable cte

1179 (statement commons schemas params common)

1051 (statement commons schemas params common)

1180− (AlignedList (CommonTableExpression statement schemas params) commons commons1) where

1052+ (Path (CommonTableExpression statement schemas params) commons commons1) where

1181− statement `as` cte = single (statement `as` cte)

1053+ statement `as` cte = csingleton (statement `as` cte)

1182

1054

1183instance (forall c s p r. RenderSQL (statement c s p r)) => RenderSQL

1055instance (forall c s p r. RenderSQL (statement c s p r)) => RenderSQL

1184 (CommonTableExpression statement schemas params commons0 commons1) where

1056 (CommonTableExpression statement schemas params commons0 commons1) where

@@ -1190,7 +1062,7 @@ instance (forall c s p r. RenderSQL (statement c s p r)) => RenderSQL

1190-- defining temporary tables that exist just for one query.

1062-- defining temporary tables that exist just for one query.

1191class With statement where

1063class With statement where

1192 with

1064 with

1193− :: AlignedList (CommonTableExpression statement schemas params) commons0 commons1

1065+ :: Path (CommonTableExpression statement schemas params) commons0 commons1

1194 -- ^ common table expressions

1066 -- ^ common table expressions

1195 -> statement commons1 schemas params row

1067 -> statement commons1 schemas params row

1196 -- ^ larger query

1068 -- ^ larger query

@@ -1198,4 +1070,29 @@ class With statement where

1198instance With (Query outer) where

1070instance With (Query outer) where

1199 with Done query = query

1071 with Done query = query

1200 with ctes query = UnsafeQuery $

1072 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)

1201− "WITH" <+> renderSQL ctes <+> renderSQL query

1098+ <+> renderSQL query

squeal-postgresql/src/Squeal/PostgreSQL/Render.hs+39−6

@@ -10,31 +10,37 @@ Rendering helper functions.

11{-# LANGUAGE

12 AllowAmbiguousTypes

13+ , ConstraintKinds

13 , FlexibleContexts

14 , FlexibleContexts

15+ , LambdaCase

14 , MagicHash

16 , MagicHash

15 , OverloadedStrings

17 , OverloadedStrings

16 , PolyKinds

18 , PolyKinds

17 , RankNTypes

19 , RankNTypes

18 , ScopedTypeVariables

20 , ScopedTypeVariables

21+ , TypeApplications

19#-}

22#-}

21module Squeal.PostgreSQL.Render

24module Squeal.PostgreSQL.Render

22 ( -- * Render

25 ( -- * Render

26+ RenderSQL (..)

27+ , printSQL

28+ , escape

23− parenthesized

29+ , parenthesized

30+ , bracketed

24 , (<+>)

31 , (<+>)

25 , commaSeparated

32 , commaSeparated

26 , doubleQuoted

33 , doubleQuoted

27 , singleQuotedText

34 , singleQuotedText

28 , singleQuotedUtf8

35 , singleQuotedUtf8

29 , renderCommaSeparated

36 , renderCommaSeparated

37+ , renderCommaSeparatedConstraint

30 , renderCommaSeparatedMaybe

38 , renderCommaSeparatedMaybe

31 , renderNat

39 , renderNat

32 , renderSymbol

40 , renderSymbol

33− , RenderSQL (..)

34− , printSQL

35 ) where

41 ) where

37−import Control.Monad.Base

43+import Control.Monad.IO.Class (MonadIO (..))

38import Data.ByteString (ByteString)

44import Data.ByteString (ByteString)

39import Data.Maybe (catMaybes)

45import Data.Maybe (catMaybes)

40import Data.Monoid ((<>))

46import Data.Monoid ((<>))

@@ -52,6 +58,10 @@ import qualified Data.ByteString.Char8 as Char8

52parenthesized :: ByteString -> ByteString

58parenthesized :: ByteString -> ByteString

53parenthesized str = "(" <> str <> ")"

59parenthesized str = "(" <> str <> ")"

61+-- | Square bracket a `ByteString`

62+bracketed :: ByteString -> ByteString

63+bracketed str = "[" <> str <> "]"

64+

55-- | Concatenate two `ByteString`s with a space between.

65-- | Concatenate two `ByteString`s with a space between.

56(<+>) :: ByteString -> ByteString -> ByteString

66(<+>) :: ByteString -> ByteString -> ByteString

57infixr 7 <+>

67infixr 7 <+>

@@ -84,6 +94,16 @@ renderCommaSeparated render

84 . hcollapse

94 . hcollapse

85 . hmap (K . render)

95 . 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+

87-- | Comma separate the `Maybe` renderings of a heterogeneous list, dropping

107-- | Comma separate the `Maybe` renderings of a heterogeneous list, dropping

88-- `Nothing`s.

108-- `Nothing`s.

89renderCommaSeparatedMaybe

109renderCommaSeparatedMaybe

@@ -108,5 +128,18 @@ renderSymbol = fromString (symbolVal' (proxy# :: Proxy# s))

108class RenderSQL sql where renderSQL :: sql -> ByteString

128class RenderSQL sql where renderSQL :: sql -> ByteString

109

129

110-- | Print SQL.

130-- | Print SQL.

111−printSQL :: (RenderSQL sql, MonadBase IO io) => sql -> io ()

131+printSQL :: (RenderSQL sql, MonadIO io) => sql -> io ()

112−printSQL = liftBase . Char8.putStrLn . renderSQL

132+printSQL = liftIO . Char8.putStrLn . renderSQL

133+

134+-- | `escape` a character to prevent injection

135+escape :: Char -> String

136+escape = \case

137+ '\NUL' -> "\\0"

138+ '\'' -> "''"

139+ '"' -> "\\\""

140+ '\b' -> "\\b"

141+ '\n' -> "\\n"

142+ '\r' -> "\\r"

143+ '\t' -> "\\t"

144+ '\\' -> "\\\\"

145+ c -> [c]

squeal-postgresql/src/Squeal/PostgreSQL/Schema.hs+181−371

@@ -1,16 +1,15 @@

1{-|

2Module: Squeal.PostgreSQL.Schema

3Description: Embedding of PostgreSQL type and alias system

4−Copyright: (c) Eitan Chatav, 2017

4+Copyright: (c) Eitan Chatav, 2019

5Maintainer: eitan@morphism.tech

6Stability: experimental

8−This module provides a type-level DSL for kinds of Postgres types,

8+`Squeal.PostgreSQL.Schema` 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 #-}

14{-# LANGUAGE

13{-# LANGUAGE

15 AllowAmbiguousTypes

14 AllowAmbiguousTypes

16 , ConstraintKinds

15 , ConstraintKinds

@@ -45,6 +44,10 @@ module Squeal.PostgreSQL.Schema

45 , ColumnsType

44 , ColumnsType

46 , TableType

45 , TableType

47 , SchemumType (..)

46 , SchemumType (..)

47+ , IndexType (..)

48+ , FunctionType

49+ , OperatorType (..)

50+ , ReturnsType (..)

48 , SchemaType

51 , SchemaType

49 , SchemasType

52 , SchemasType

50 , Public

53 , Public

@@ -54,52 +57,30 @@ module Squeal.PostgreSQL.Schema

54 , TableConstraint (..)

57 , TableConstraint (..)

55 , TableConstraints

58 , TableConstraints

56 , Uniquely

59 , 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 (..)

73 -- * Enumerated Labels

60 -- * Enumerated Labels

74 , IsPGlabel (..)

61 , IsPGlabel (..)

75 , PGlabel (..)

62 , PGlabel (..)

76− -- * Grouping

77− , Grouping (..)

78− , GroupedBy

79− -- * Aligned lists

80− , AlignedList (..)

81− , single

82 -- * Data Definitions

63 -- * Data Definitions

83 , Create

64 , Create

65+ , CreateIfNotExists

66+ , CreateOrReplace

84 , Drop

67 , Drop

68+ , DropSchemum

69+ , DropIfExists

70+ , DropSchemumIfExists

85 , Alter

71 , Alter

72+ , AlterIfExists

86 , Rename

73 , Rename

74+ , RenameIfExists

75+ , ConstraintInvolves

87 , DropIfConstraintsInvolve

76 , DropIfConstraintsInvolve

88− -- * Lists

77+ , IsNotElem

89− , Join

78+ , AllUnique

90− , disjoin

91− , Elem

92− , In

93− , Length

94 -- * Type Classifications

79 -- * Type Classifications

95− , HasOid (..)

96 , PGNum

80 , PGNum

97 , PGIntegral

81 , PGIntegral

98 , PGFloating

82 , PGFloating

99 , PGTypeOf

83 , PGTypeOf

100− , PGArrayOf

101− , PGArray

102− , PGTextArray

103 , PGJsonType

84 , PGJsonType

104 , PGJsonKey

85 , PGJsonKey

105 , SamePGType

86 , SamePGType

@@ -116,25 +97,22 @@ module Squeal.PostgreSQL.Schema

116 ) where

97 ) where

117

118import Control.Category

99import Control.Category

119−import Control.DeepSeq

120−import Data.ByteString (ByteString)

121import Data.Kind

100import Data.Kind

122import Data.Monoid hiding (All)

101import Data.Monoid hiding (All)

123−import Data.String

124import Data.Type.Bool

102import Data.Type.Bool

125−import Data.Word (Word32)

126import Generics.SOP

103import Generics.SOP

127−import GHC.OverloadedLabels

128import GHC.TypeLits

104import GHC.TypeLits

129import Prelude hiding (id, (.))

105import Prelude hiding (id, (.))

130

106

131−import qualified GHC.Generics as GHC

107+import Squeal.PostgreSQL.Alias

132−

108+import Squeal.PostgreSQL.List

133import Squeal.PostgreSQL.Render

109import Squeal.PostgreSQL.Render

134

110

111+-- $setup

112+-- >>> import Squeal.PostgreSQL

113+

135-- | `PGType` is the promoted datakind of PostgreSQL types.

114-- | `PGType` is the promoted datakind of PostgreSQL types.

136--

115--

137−-- >>> import Squeal.PostgreSQL.Schema

138-- >>> :kind 'PGbool

116-- >>> :kind 'PGbool

139-- 'PGbool :: PGType

117-- 'PGbool :: PGType

140data PGType

118data PGType

@@ -164,36 +142,12 @@ data PGType

164 | PGfixarray [Nat] NullityType -- ^ fixed length array

142 | PGfixarray [Nat] NullityType -- ^ fixed length array

165 | PGenum [Symbol] -- ^ enumerated (enum) types are data types that comprise a static, ordered set of values.

143 | PGenum [Symbol] -- ^ enumerated (enum) types are data types that comprise a static, ordered set of values.

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.

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.

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.

146+ | PGtsquery -- ^ A tsquery value stores lexemes that are to be searched for.

147+ | PGoid -- Object identifiers (OIDs) are used internally by PostgreSQL as primary keys for various system tables.

148+ | PGrange PGType -- ^ Range types are data types representing a range of values of some element type (called the range's subtype).

167 | UnsafePGType Symbol -- ^ an escape hatch for unsupported PostgreSQL types

149 | UnsafePGType Symbol -- ^ an escape hatch for unsupported PostgreSQL types

168

150

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

170−--

171−-- >>> :set -XTypeApplications

172−-- >>> oid @'PGbool

173−-- 16

174−class HasOid (ty :: PGType) where oid :: Word32

175−instance HasOid 'PGbool where oid = 16

176−instance HasOid 'PGint2 where oid = 21

177−instance HasOid 'PGint4 where oid = 23

178−instance HasOid 'PGint8 where oid = 20

179−instance HasOid 'PGnumeric where oid = 1700

180−instance HasOid 'PGfloat4 where oid = 700

181−instance HasOid 'PGfloat8 where oid = 701

182−instance HasOid ('PGchar n) where oid = 18

183−instance HasOid ('PGvarchar n) where oid = 1043

184−instance HasOid 'PGtext where oid = 25

185−instance HasOid 'PGbytea where oid = 17

186−instance HasOid 'PGtimestamp where oid = 1114

187−instance HasOid 'PGtimestamptz where oid = 1184

188−instance HasOid 'PGdate where oid = 1082

189−instance HasOid 'PGtime where oid = 1083

190−instance HasOid 'PGtimetz where oid = 1266

191−instance HasOid 'PGinterval where oid = 1186

192−instance HasOid 'PGuuid where oid = 2950

193−instance HasOid 'PGinet where oid = 869

194−instance HasOid 'PGjson where oid = 114

195−instance HasOid 'PGjsonb where oid = 3802

196−

197-- | `NullityType` encodes the potential presence or definite absence of a

151-- | `NullityType` encodes the potential presence or definite absence of a

198-- @NULL@ allowing operations which are sensitive to such to be well typed.

152-- @NULL@ allowing operations which are sensitive to such to be well typed.

199--

153--

@@ -212,11 +166,6 @@ data NullityType

212type (:=>) constraint ty = '(constraint,ty)

166type (:=>) constraint ty = '(constraint,ty)

213infixr 7 :=>

167infixr 7 :=>

214

168

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

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

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

218−infixr 6 :::

219−

220-- | `ColumnConstraint` encodes the availability of @DEFAULT@ for inserts and updates.

169-- | `ColumnConstraint` encodes the availability of @DEFAULT@ for inserts and updates.

221-- A column can be assigned a default value.

170-- A column can be assigned a default value.

222-- A data `Squeal.PostgreSQL.Manipulations.Manipulation` command can also

171-- A data `Squeal.PostgreSQL.Manipulations.Manipulation` command can also

@@ -311,9 +260,19 @@ type FromType = [(Symbol,RowType)]

311

260

312-- | `ColumnsToRow` removes column constraints.

261-- | `ColumnsToRow` removes column constraints.

313type family ColumnsToRow (columns :: ColumnsType) :: RowType where

262type family ColumnsToRow (columns :: ColumnsType) :: RowType where

314− ColumnsToRow '[] = '[]

263+ ColumnsToRow (column ::: _ :=> ty ': column1 ::: _ :=> ty1 ': column2 ::: _ :=> ty2 ': column3 ::: _ :=> ty3 ': column4 ::: _ :=> ty4 ': column5 ::: _ :=> ty5 ': columns) =

315− ColumnsToRow (column ::: constraint :=> ty ': 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) =

316 column ::: ty ': ColumnsToRow columns

274 column ::: ty ': ColumnsToRow columns

275+ ColumnsToRow '[] = '[]

317

276

318-- | `TableToColumns` removes table constraints.

277-- | `TableToColumns` removes table constraints.

319type family TableToColumns (table :: TableType) :: ColumnsType where

278type family TableToColumns (table :: TableType) :: ColumnsType where

@@ -323,212 +282,6 @@ type family TableToColumns (table :: TableType) :: ColumnsType where

323type family TableToRow (table :: TableType) :: RowType where

282type family TableToRow (table :: TableType) :: RowType where

324 TableToRow tab = ColumnsToRow (TableToColumns tab)

283 TableToRow tab = ColumnsToRow (TableToColumns tab)

325

284

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

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

328−-- for typesafe aggregation

329−data Grouping

330− = Ungrouped -- ^ no aggregation permitted

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

332−

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

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

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

336−-}

337−class (KnownSymbol table, KnownSymbol column)

338− => GroupedBy table column bys where

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

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

341−instance {-# OVERLAPPABLE #-}

342− ( KnownSymbol table

343− , KnownSymbol column

344− , GroupedBy table column bys

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

346−

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

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

349−--

350−-- >>> :set -XOverloadedLabels

351−-- >>> #foobar :: Alias "foobar"

352−-- Alias

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

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

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

356− fromLabel = Alias

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

358− fromLabel = fromLabel :* Nil

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

360−-- "jimbob"

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

362− renderSQL = doubleQuoted . fromString . symbolVal

363−

364−-- | >>> import Generics.SOP (NP(..))

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

366−-- "jimbob", "kandi"

367−instance All KnownSymbol aliases => RenderSQL (NP Alias aliases) where

368− renderSQL

369− = commaSeparated

370− . hcollapse

371− . hcmap (Proxy @KnownSymbol) (K . renderSQL)

372−

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

374−-- version of `:::`.

375−--

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

377−-- As (Just "hello") Alias

378−data Aliased expression aliased where

379− As

380− :: KnownSymbol alias

381− => expression ty

382− -> Alias alias

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

384−deriving instance Show (expression ty)

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

386−deriving instance Eq (expression ty)

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

388−deriving instance Ord (expression ty)

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

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

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

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

393−

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

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

396−class KnownSymbol alias => Aliasable alias expression aliased

397− | aliased -> expression

398− , aliased -> alias

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

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

401− (expression ty)

402− (Aliased expression aliased)

403− where

404− as = As

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

406− (expression ty)

407− (NP (Aliased expression) tys)

408− where

409− expression `as` alias = expression `As` alias :* Nil

410−

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

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

413−-- "Just AS \"an_int\""

414−renderAliased

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

416− -> Aliased expression aliased

417− -> ByteString

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

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

420−

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

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

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

424−

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

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

427−-- from @alias@ and @fields@.

428−class KnownSymbol alias =>

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

430− | alias fields -> field where

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

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

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

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

435−

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

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

438−choose which subfields to update.

439−-}

440−class HasIn fields field where

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

442−

443−-- | Utility class for `AllUnique` to provide nicer error messages.

444−class IsNotElem x isElem where

445−instance IsNotElem x 'False where

446−instance (TypeError ( 'Text "Cannot assign to "

447− ':<>: 'ShowType alias

448− ':<>: 'Text " more than once"))

449− => IsNotElem '(alias, a) 'True where

450−

451−-- | No elem of @xs@ appears more than once, in the context of assignment.

452−class AllUnique (xs :: [(Symbol, a)]) where

453−instance AllUnique '[] where

454−instance (IsNotElem x (Elem x xs), AllUnique xs) => AllUnique (x ': xs) where

455−

456−{- |

457−The `DefaultAliasable` class is intended to help with Scrap your Nils

458−for default inserts and updates.

459−-}

460−class KnownSymbol alias

461− => DefaultAliasable alias aliased | aliased -> alias where

462− defaultAs :: Alias alias -> aliased

463−

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

465−-- a list of @subfields@.

466−class

467− ( All KnownSymbol aliases

468− ) => HasAll

469− (aliases :: [Symbol])

470− (fields :: [(Symbol,kind)])

471− (subfields :: [(Symbol,kind)])

472− | aliases fields -> subfields where

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

474−instance {-# OVERLAPPABLE #-}

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

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

477−

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

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

480−-- by a table alias.

481−class IsQualified table column expression where

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

483− infixl 9 !

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

485−

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

487−to a `Table`, `Typedef` or `View` to be qualified by their schemas. By default,

488−a qualifier of @public@ is provided.

489−

490−>>> :{

491−let

492− alias1 :: QualifiedAlias "sch" "tab"

493− alias1 = #sch ! #tab

494− alias2 :: QualifiedAlias "public" "vw"

495− alias2 = #vw

496−in printSQL alias1 >> printSQL alias2

497−:}

498−"sch"."tab"

499−"vw"

500−-}

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

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

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

504− _!_ = QualifiedAlias

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

506− fromLabel = QualifiedAlias

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

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

509− _!_ = QualifiedAlias `As` Alias

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

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

512− fromLabel = QualifiedAlias `As` Alias

513−

514−instance (KnownSymbol q, KnownSymbol a)

515− => RenderSQL (QualifiedAlias q a) where

516− renderSQL _ =

517− let

518− qualifier = renderSQL (Alias @q)

519− alias = renderSQL (Alias @a)

520− in

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

522−

523−-- | @Elem@ is a promoted `Data.List.elem`.

524−type family Elem x xs where

525− Elem x '[] = 'False

526− Elem x (x ': xs) = 'True

527− Elem x (_ ': xs) = Elem x xs

528−

529−-- | @In x xs@ is a constraint that proves that @x@ is in @xs@.

530−type family In x xs :: Constraint where In x xs = Elem x xs ~ 'True

531−

532-- | Numeric Postgres types.

285-- | Numeric Postgres types.

533type PGNum =

286type PGNum =

534 '[ 'PGint2, 'PGint4, 'PGint8, 'PGnumeric, 'PGfloat4, 'PGfloat8]

287 '[ 'PGint2, 'PGint4, 'PGint8, 'PGnumeric, 'PGfloat4, 'PGfloat8]

@@ -539,37 +292,6 @@ type PGFloating = '[ 'PGfloat4, 'PGfloat8, 'PGnumeric]

539-- | Integral Postgres types.

292-- | Integral Postgres types.

540type PGIntegral = '[ 'PGint2, 'PGint4, 'PGint8]

293type PGIntegral = '[ 'PGint2, 'PGint4, 'PGint8]

541

294

542−-- | Error message helper for displaying unavailable\/unknown\/placeholder type

543−-- variables whose kind is known.

544−type Placeholder k = 'Text "(_::" :<>: 'ShowType k :<>: 'Text ")"

545−

546−type ErrArrayOf arr ty = arr :<>: 'Text " " :<>: ty

547−type ErrPGfixarrayOf t = ErrArrayOf ('ShowType 'PGfixarray :<>: 'Text " " :<>: Placeholder Nat) t

548−type ErrPGvararrayOf t = ErrArrayOf ('ShowType 'PGvararray) t

549−

550−-- | Ensure a type is a valid array type.

551−type family PGArray name arr :: Constraint where

552− PGArray name ('PGvararray x) = ()

553− PGArray name ('PGfixarray n x) = ()

554− PGArray name val = TypeError

555− ('Text name :<>: 'Text ": Unsatisfied PGArray constraint. Expected either: "

556− :$$: 'Text " • " :<>: ErrPGvararrayOf (Placeholder PGType)

557− :$$: 'Text " • " :<>: ErrPGfixarrayOf (Placeholder PGType)

558− :$$: 'Text "But got: " :<>: 'ShowType val)

559−

560−-- | Ensure a type is a valid array type with a specific element type.

561−type family PGArrayOf name arr ty :: Constraint where

562− PGArrayOf name ('PGvararray x) ty = x ~ ty

563− PGArrayOf name ('PGfixarray n x) ty = x ~ ty

564− PGArrayOf name val ty = TypeError

565− ( 'Text name :<>: 'Text "Unsatisfied PGArrayOf constraint. Expected either: "

566− :$$: 'Text " • " :<>: ErrPGvararrayOf ( 'ShowType ty )

567− :$$: 'Text " • " :<>: ErrPGfixarrayOf ( 'ShowType ty )

568− :$$: 'Text "But got: " :<>: 'ShowType val)

569−

570−-- | Ensure a type is a valid array type whose elements are text.

571−type PGTextArray name arr = PGArrayOf name arr ('NotNull 'PGtext)

572−

573-- | `PGTypeOf` forgets about @NULL@ and any column constraints.

295-- | `PGTypeOf` forgets about @NULL@ and any column constraints.

574type family PGTypeOf (ty :: NullityType) :: PGType where

296type family PGTypeOf (ty :: NullityType) :: PGType where

575 PGTypeOf (nullity pg) = pg

297 PGTypeOf (nullity pg) = pg

@@ -583,14 +305,24 @@ instance ty0 ~ ty1 => SamePGType

583

305

584-- | `AllNotNull` is a constraint that proves a `ColumnsType` has no @NULL@s.

306-- | `AllNotNull` is a constraint that proves a `ColumnsType` has no @NULL@s.

585type family AllNotNull (columns :: ColumnsType) :: Constraint where

307type 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

586 AllNotNull '[] = ()

314 AllNotNull '[] = ()

587− AllNotNull (column ::: def :=> 'NotNull ty ': columns) = AllNotNull columns

588

315

589-- | `NotAllNull` is a constraint that proves a `ColumnsType` has some

316-- | `NotAllNull` is a constraint that proves a `ColumnsType` has some

590-- @NOT NULL@.

317-- @NOT NULL@.

591type family NotAllNull (columns :: ColumnsType) :: Constraint where

318type family NotAllNull (columns :: ColumnsType) :: Constraint where

592− NotAllNull (column ::: def :=> 'NotNull ty ': columns) = ()

319+ NotAllNull (_ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> 'NotNull _ ': _) = ()

320+ NotAllNull (_ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> 'NotNull _ ': _) = ()

321+ NotAllNull (_ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> 'NotNull _ ': _) = ()

322+ NotAllNull (_ ::: _ :=> _ _ ': _ ::: _ :=> _ _ ': _ ::: _ :=> 'NotNull _ ': _) = ()

323+ NotAllNull (_ ::: _ :=> _ _ ': _ ::: _ :=> 'NotNull _ ': _) = ()

324+ NotAllNull (_ ::: _ :=> 'NotNull _ ': _) = ()

593− NotAllNull (column ::: def :=> 'Null ty ': columns) = NotAllNull columns

325+ NotAllNull (_ ::: _ :=> 'Null _ ': columns) = NotAllNull columns

594

326

595-- | `NullifyType` is an idempotent that nullifies a `NullityType`.

327-- | `NullifyType` is an idempotent that nullifies a `NullityType`.

596type family NullifyType (ty :: NullityType) :: NullityType where

328type family NullifyType (ty :: NullityType) :: NullityType where

@@ -599,33 +331,37 @@ type family NullifyType (ty :: NullityType) :: NullityType where

599

331

600-- | `NullifyRow` is an idempotent that nullifies a `RowType`.

332-- | `NullifyRow` is an idempotent that nullifies a `RowType`.

601type family NullifyRow (columns :: RowType) :: RowType where

333type family NullifyRow (columns :: RowType) :: RowType where

602− NullifyRow '[] = '[]

334+ NullifyRow (column ::: ty ': column1 ::: ty1 ': column2 ::: ty2 ': column3 ::: ty3 ': column4 ::: ty4 ': column5 ::: ty5 ': columns) =

335+ column ::: NullifyType ty ': column1 ::: NullifyType ty1 ': column2 ::: NullifyType ty2 ': column3 ::: NullifyType ty3 ': column4 ::: NullifyType ty4 ': column5 ::: NullifyType ty5 ': NullifyRow columns

336+ NullifyRow (column ::: ty ': column1 ::: ty1 ': column2 ::: ty2 ': column3 ::: ty3 ': column4 ::: ty4 ': columns) =

337+ column ::: NullifyType ty ': column1 ::: NullifyType ty1 ': column2 ::: NullifyType ty2 ': column3 ::: NullifyType ty3 ': column4 ::: NullifyType ty4 ': NullifyRow columns

338+ NullifyRow (column ::: ty ': column1 ::: ty1 ': column2 ::: ty2 ': column3 ::: ty3 ': columns) =

339+ column ::: NullifyType ty ': column1 ::: NullifyType ty1 ': column2 ::: NullifyType ty2 ': column3 ::: NullifyType ty3 ': NullifyRow columns

340+ NullifyRow (column ::: ty ': column1 ::: ty1 ': column2 ::: ty2 ': columns) =

341+ column ::: NullifyType ty ': column1 ::: NullifyType ty1 ': column2 ::: NullifyType ty2 ': NullifyRow columns

342+ NullifyRow (column ::: ty ': column1 ::: ty1 ': columns) =

343+ column ::: NullifyType ty ': column1 ::: NullifyType ty1 ': NullifyRow columns

603 NullifyRow (column ::: ty ': columns) =

344 NullifyRow (column ::: ty ': columns) =

604 column ::: NullifyType ty ': NullifyRow columns

345 column ::: NullifyType ty ': NullifyRow columns

346+ NullifyRow '[] = '[]

605

347

606-- | `NullifyFrom` is an idempotent that nullifies a `FromType`

348-- | `NullifyFrom` is an idempotent that nullifies a `FromType`

607-- used to nullify the left or right hand side of an outer join

349-- used to nullify the left or right hand side of an outer join

608-- in a `Squeal.PostgreSQL.Query.FromClause`.

350-- in a `Squeal.PostgreSQL.Query.FromClause`.

609type family NullifyFrom (tables :: FromType) :: FromType where

351type family NullifyFrom (tables :: FromType) :: FromType where

610− NullifyFrom '[] = '[]

352+ NullifyFrom (table ::: columns ': table1 ::: columns1 ': table2 ::: columns2 ': table3 ::: columns3 ': table4 ::: columns4 ': table5 ::: columns5 ': tables) =

353+ table ::: NullifyRow columns ': table1 ::: NullifyRow columns1 ': table2 ::: NullifyRow columns2 ': table3 ::: NullifyRow columns3 ': table4 ::: NullifyRow columns5 ': table5 ::: NullifyRow columns4 ': NullifyFrom tables

354+ NullifyFrom (table ::: columns ': table1 ::: columns1 ': table2 ::: columns2 ': table3 ::: columns3 ': table4 ::: columns4 ': tables) =

355+ table ::: NullifyRow columns ': table1 ::: NullifyRow columns1 ': table2 ::: NullifyRow columns2 ': table3 ::: NullifyRow columns3 ': table4 ::: NullifyRow columns4 ': NullifyFrom tables

356+ NullifyFrom (table ::: columns ': table1 ::: columns1 ': table2 ::: columns2 ': table3 ::: columns3 ': tables) =

357+ table ::: NullifyRow columns ': table1 ::: NullifyRow columns1 ': table2 ::: NullifyRow columns2 ': table3 ::: NullifyRow columns3 ': NullifyFrom tables

358+ NullifyFrom (table ::: columns ': table1 ::: columns1 ': table2 ::: columns2 ': tables) =

359+ table ::: NullifyRow columns ': table1 ::: NullifyRow columns1 ': table2 ::: NullifyRow columns2 ': NullifyFrom tables

360+ NullifyFrom (table ::: columns ': table1 ::: columns1 ': tables) =

361+ table ::: NullifyRow columns ': table1 ::: NullifyRow columns1 ': NullifyFrom tables

611 NullifyFrom (table ::: columns ': tables) =

362 NullifyFrom (table ::: columns ': tables) =

612 table ::: NullifyRow columns ': NullifyFrom tables

363 table ::: NullifyRow columns ': NullifyFrom tables

613−

364+ NullifyFrom '[] = '[]

614−-- | `Join` is simply promoted `++` and is used in @JOIN@s in

615−-- `Squeal.PostgreSQL.Query.FromClause`s.

616−type family Join xs ys where

617− Join '[] ys = ys

618− Join (x ': xs) ys = x ': Join xs ys

619−

620−-- | `disjoin` is a utility function for splitting an `NP` list into pieces.

621−disjoin

622− :: forall xs ys expr. SListI xs

623− => NP expr (Join xs ys)

624− -> (NP expr xs, NP expr ys)

625−disjoin = case sList @xs of

626− SNil -> \ys -> (Nil, ys)

627− SCons -> \(x :* xsys) ->

628− case disjoin xsys of (xs,ys) -> (x :* xs, ys)

629

365

630-- | @Create alias x xs@ adds @alias ::: x@ to the end of @xs@ and is used in

366-- | @Create alias x xs@ adds @alias ::: x@ to the end of @xs@ and is used in

631-- `Squeal.PostgreSQL.Definition.createTable` statements and in @ALTER TABLE@

367-- `Squeal.PostgreSQL.Definition.createTable` statements and in @ALTER TABLE@

@@ -635,30 +371,101 @@ type family Create alias x xs where

635 Create alias x (alias ::: y ': xs) = TypeError

371 Create alias x (alias ::: y ': xs) = TypeError

636 ('Text "Create: alias "

372 ('Text "Create: alias "

637 ':<>: 'ShowType alias

373 ':<>: 'ShowType alias

638− ':<>: 'Text "already in use")

374+ ':<>: 'Text "already exists")

639 Create alias y (x ': xs) = x ': Create alias y xs

375 Create alias y (x ': xs) = x ': Create alias y xs

640

376

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+

641-- | @Drop alias xs@ removes the type associated with @alias@ in @xs@

394-- | @Drop alias xs@ removes the type associated with @alias@ in @xs@

642-- and is used in `Squeal.PostgreSQL.Definition.dropTable` statements

395-- and is used in `Squeal.PostgreSQL.Definition.dropTable` statements

643-- and in @ALTER TABLE@ `Squeal.PostgreSQL.Definition.dropColumn` statements.

396-- and in @ALTER TABLE@ `Squeal.PostgreSQL.Definition.dropColumn` statements.

644type family Drop alias xs where

397type family Drop alias xs where

398+ Drop alias '[] = TypeError

399+ ('Text "Drop: alias "

400+ ':<>: 'ShowType alias

401+ ':<>: 'Text " does not exist" )

645− Drop alias ((alias ::: x) ': xs) = xs

402+ Drop alias (alias ::: x ': xs) = xs

646 Drop alias (x ': xs) = x ': Drop alias xs

403 Drop alias (x ': xs) = x ': Drop alias xs

647

404

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+

648-- | @Alter alias x xs@ replaces the type associated with an @alias@ in @xs@

437-- | @Alter alias x xs@ replaces the type associated with an @alias@ in @xs@

649-- with the type @x@ and is used in `Squeal.PostgreSQL.Definition.alterTable`

438-- with the type @x@ and is used in `Squeal.PostgreSQL.Definition.alterTable`

650-- and `Squeal.PostgreSQL.Definition.alterColumn`.

439-- and `Squeal.PostgreSQL.Definition.alterColumn`.

651type family Alter alias x xs where

440type family Alter alias x xs where

441+ Alter alias x '[] = TypeError

442+ ('Text "Alter: alias "

443+ ':<>: 'ShowType alias

444+ ':<>: 'Text " does not exist" )

652 Alter alias x1 (alias ::: x0 ': xs) = alias ::: x1 ': xs

445 Alter alias x1 (alias ::: x0 ': xs) = alias ::: x1 ': xs

653 Alter alias x1 (x0 ': xs) = x0 ': Alter alias x1 xs

446 Alter alias x1 (x0 ': xs) = x0 ': Alter alias x1 xs

654

447

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+

655-- | @Rename alias0 alias1 xs@ replaces the alias @alias0@ by @alias1@ in @xs@

453-- | @Rename alias0 alias1 xs@ replaces the alias @alias0@ by @alias1@ in @xs@

656-- and is used in `Squeal.PostgreSQL.Definition.alterTableRename` and

454-- and is used in `Squeal.PostgreSQL.Definition.alterTableRename` and

657-- `Squeal.PostgreSQL.Definition.renameColumn`.

455-- `Squeal.PostgreSQL.Definition.renameColumn`.

658type family Rename alias0 alias1 xs where

456type family Rename alias0 alias1 xs where

457+ Rename alias0 alias1 '[] = TypeError

458+ ('Text "Rename: alias "

459+ ':<>: 'ShowType alias0

460+ ':<>: 'Text " does not exist" )

659 Rename alias0 alias1 ((alias0 ::: x0) ': xs) = (alias1 ::: x0) ': xs

461 Rename alias0 alias1 ((alias0 ::: x0) ': xs) = (alias1 ::: x0) ': xs

660 Rename alias0 alias1 (x ': xs) = x ': Rename alias0 alias1 xs

462 Rename alias0 alias1 (x ': xs) = x ': Rename alias0 alias1 xs

661

463

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+

662-- | Check if a `TableConstraint` involves a column

469-- | Check if a `TableConstraint` involves a column

663type family ConstraintInvolves column constraint where

470type family ConstraintInvolves column constraint where

664 ConstraintInvolves column ('Check columns) = column `Elem` columns

471 ConstraintInvolves column ('Check columns) = column `Elem` columns

@@ -675,22 +482,35 @@ type family DropIfConstraintsInvolve column constraints where

675 (DropIfConstraintsInvolve column constraints)

482 (DropIfConstraintsInvolve column constraints)

676 (alias ::: constraint ': DropIfConstraintsInvolve column constraints)

483 (alias ::: constraint ': DropIfConstraintsInvolve column constraints)

677

484

678−{- | Calculate the `Length` of a type level list

679−

680−>>> :kind! Length '[Char,String,Bool,Double]

681−Length '[Char,String,Bool,Double] :: Nat

682−= 4

683−-}

684−type family Length (xs :: [k]) :: Nat where

685− Length (x : xs) = 1 + Length xs

686− Length '[] = 0

687−

688-- | A `SchemumType` is a user-defined type, either a `Table`,

485-- | A `SchemumType` is a user-defined type, either a `Table`,

689-- `View` or `Typedef`.

486-- `View` or `Typedef`.

690data SchemumType

487data SchemumType

691 = Table TableType

488 = Table TableType

692 | View RowType

489 | View RowType

693 | Typedef PGType

490 | 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

694

514

695{- | The schema of a database consists of a list of aliased,

515{- | The schema of a database consists of a list of aliased,

696user-defined `SchemumType`s.

516user-defined `SchemumType`s.

@@ -733,9 +553,7 @@ There are several reasons why one might want to use schemas:

733-}

553-}

734type SchemasType = [(Symbol,SchemaType)]

554type SchemasType = [(Symbol,SchemaType)]

735

555

736−{-|

556+-- | A type family to use for a single schema database.

737−

738−-}

739type family Public (schema :: SchemaType) :: SchemasType

557type family Public (schema :: SchemaType) :: SchemasType

740 where Public schema = '["public" ::: schema]

558 where Public schema = '["public" ::: schema]

741

559

@@ -764,23 +582,15 @@ type PGJsonKey = '[ 'PGint2, 'PGint4, 'PGtext ]

764-- | Is a type a valid JSON type?

582-- | Is a type a valid JSON type?

765type PGJsonType = '[ 'PGjson, 'PGjsonb ]

583type PGJsonType = '[ 'PGjson, 'PGjsonb ]

766

584

767−-- | An `AlignedList` is a type-aligned list or free category.

585+-- | Utility class for `AllUnique` to provide nicer error messages.

768−data AlignedList p x0 x1 where

586+class IsNotElem x isElem where

769− Done :: AlignedList p x x

587+instance IsNotElem x 'False where

770− (:>>) :: p x0 x1 -> AlignedList p x1 x2 -> AlignedList p x0 x2

588+instance (TypeError ( 'Text "Cannot assign to "

771−infixr 7 :>>

589+ ':<>: 'ShowType alias

772−instance Category (AlignedList p) where

590+ ':<>: 'Text " more than once"))

773− id = Done

591+ => IsNotElem '(alias, a) 'True where

774− (.) list = \case

592+

775− Done -> list

593+-- | No elem of @xs@ appears more than once, in the context of assignment.

776− step :>> steps -> step :>> (steps >>> list)

594+class AllUnique (xs :: [(Symbol, a)]) where

777−instance (forall t0 t1. RenderSQL (p t0 t1))

595+instance AllUnique '[] where

778− => RenderSQL (AlignedList p x0 x1) where

596+instance (IsNotElem x (Elem x xs), AllUnique xs) => AllUnique (x ': xs) where

779− renderSQL = \case

780− Done -> ""

781− step :>> Done -> renderSQL step

782− step :>> steps -> renderSQL step <> ", " <> renderSQL steps

783−

784−-- | A `single` step.

785−single :: p x0 x1 -> AlignedList p x0 x1

786−single step = step :>> Done

squeal-postgresql/src/Squeal/PostgreSQL/Transaction.hs+78−48

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

1{-|

2Module: Squeal.PostgreSQL.Transaction

3Description: Squeal transaction control language

4−Copyright: (c) Eitan Chatav, 2017

4+Copyright: (c) Eitan Chatav, 2019

5Maintainer: eitan@morphism.tech

6Stability: experimental

@@ -20,11 +20,12 @@ module Squeal.PostgreSQL.Transaction

20 ( -- * Transaction

21 transactionally

22 , transactionally_

23+ , transactionallyRetry

24+ , ephemerally

25+ , ephemerally_

23 , begin

26 , begin

24 , commit

27 , commit

25 , rollback

28 , rollback

26− , transactionallySchema

27− , transactionallySchema_

28 -- * Transaction Mode

29 -- * Transaction Mode

29 , TransactionMode (..)

30 , TransactionMode (..)

30 , defaultMode

31 , defaultMode

@@ -34,70 +35,99 @@ module Squeal.PostgreSQL.Transaction

34 , DeferrableMode (..)

35 , DeferrableMode (..)

35 ) where

36 ) where

37−import Control.Exception.Lifted

38+import UnliftIO

38−import Control.Monad.Base

39−import Control.Monad.Trans.Control

40−import Generics.SOP

41−

42−import qualified Database.PostgreSQL.LibPQ as LibPQ

44import Squeal.PostgreSQL.Manipulation

40import Squeal.PostgreSQL.Manipulation

45import Squeal.PostgreSQL.Render

41import Squeal.PostgreSQL.Render

46import Squeal.PostgreSQL.PQ

42import Squeal.PostgreSQL.PQ

47−import Squeal.PostgreSQL.Schema

49−-- | Run a schema invariant computation `transactionally`.

44+{- | Run a computation `transactionally`;

45+first `begin`,

46+then run the computation,

47+`onException` `rollback` and rethrow the exception,

48+otherwise `commit` and `return` the result.

49+-}

50transactionally

51− :: (MonadBaseControl IO tx, MonadPQ schemas tx)

51+ :: (MonadUnliftIO tx, MonadPQ schemas tx)

52 => TransactionMode

53 -> tx x -- ^ run inside a transaction

54 -> tx x

55transactionally mode tx = mask $ \restore -> do

56− _ <- begin mode

56+ manipulate_ $ begin mode

57− result <- restore tx `onException` rollback

57+ result <- restore tx `onException` (manipulate_ rollback)

58− _ <- commit

58+ manipulate_ commit

59 return result

61−-- | Run a schema invariant computation `transactionally_` in `defaultMode`.

61+-- | Run a computation `transactionally_`, in `defaultMode`.

62transactionally_

63− :: (MonadBaseControl IO tx, MonadPQ schemas tx)

63+ :: (MonadUnliftIO tx, MonadPQ schemas tx)

64 => tx x -- ^ run inside a transaction

65 -> tx x

66transactionally_ = transactionally defaultMode

68−-- | @BEGIN@ a transaction.

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)

69−begin :: MonadPQ schemas tx => TransactionMode -> tx (K Result ('[] :: RowType))

79+ => TransactionMode

70−begin mode = manipulate . UnsafeManipulation $

80+ -> tx x -- ^ run inside a transaction

71− "BEGIN" <+> renderSQL mode <> ";"

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

73−-- | @COMMIT@ a schema invariant transaction.

113+{- | Run a computation `ephemerally` in `defaultMode`. -}

114+ephemerally_

74−commit :: MonadPQ schemas tx => tx (K Result ('[] :: RowType))

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.

121+begin :: TransactionMode -> Manipulation_ schemas () ()

75−commit = manipulate $ UnsafeManipulation "COMMIT;"

122+begin mode = UnsafeManipulation $ "BEGIN" <+> renderSQL mode

123

77−-- | @ROLLBACK@ a schema invariant transaction.

124+-- | @COMMIT@ a transaction.

78−rollback :: MonadPQ schemas tx => tx (K Result ('[] :: RowType))

125+commit :: Manipulation_ schemas () ()

79−rollback = manipulate $ UnsafeManipulation "ROLLBACK;"

126+commit = UnsafeManipulation "COMMIT"

127

81−-- | Run a schema changing computation `transactionallySchema`.

128+-- | @ROLLBACK@ a transaction.

82−transactionallySchema

129+rollback :: Manipulation_ schemas () ()

83− :: MonadBaseControl IO io

130+rollback = UnsafeManipulation "ROLLBACK"

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

101

131

102-- | The available transaction characteristics are the transaction `IsolationLevel`,

132-- | The available transaction characteristics are the transaction `IsolationLevel`,

103-- the transaction `AccessMode` (`ReadWrite` or `ReadOnly`), and the `DeferrableMode`.

133-- the transaction `AccessMode` (`ReadWrite` or `ReadOnly`), and the `DeferrableMode`.

@@ -110,7 +140,7 @@ data TransactionMode = TransactionMode

110-- | `TransactionMode` with a `Serializable` `IsolationLevel`,

140-- | `TransactionMode` with a `Serializable` `IsolationLevel`,

111-- `ReadWrite` `AccessMode` and `NotDeferrable` `DeferrableMode`.

141-- `ReadWrite` `AccessMode` and `NotDeferrable` `DeferrableMode`.

112defaultMode :: TransactionMode

142defaultMode :: TransactionMode

113−defaultMode = TransactionMode Serializable ReadWrite NotDeferrable

143+defaultMode = TransactionMode ReadCommitted ReadWrite NotDeferrable

114

144

115-- | `TransactionMode` with a `Serializable` `IsolationLevel`,

145-- | `TransactionMode` with a `Serializable` `IsolationLevel`,

116-- `ReadOnly` `AccessMode` and `Deferrable` `DeferrableMode`.

146-- `ReadOnly` `AccessMode` and `Deferrable` `DeferrableMode`.

squeal-postgresql/test/Doc.hsnew file+6

@@ -0,0 +1,6 @@

1+module Main (main) where

3+import Test.DocTest

5+main :: IO ()

6+main = doctest [ "-isrc", "src" ]

squeal-postgresql/test/DocTest.hsdeleted−18

@@ -1,18 +0,0 @@

1−module Main (main) where

2−

3−import Test.DocTest

4−

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.hsnew file+166

@@ -0,0 +1,166 @@

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.hsnew file+136

@@ -0,0 +1,136 @@

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.hsdeleted−126

@@ -1,126 +0,0 @@

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.hsdeleted−7

@@ -1,7 +0,0 @@

1−module Specs where

2−

3−import Test.Hspec

4−import qualified ExceptionHandling

5−

6−main :: IO ()

7−main = hspec ExceptionHandling.specs

stack.yaml+6−1

@@ -1,3 +1,8 @@

1−resolver: lts-13.8

1+resolver: nightly-2019-07-14

2packages:

3- squeal-postgresql

5+extra-deps:

6+- unliftio-pool-0.2.1.0

7+- github: morphismtech/free-categories

8+ commit: c0e555fbefb5c21619e532264c4dfeac556d0630