opaleye-0.10.2.1: src/Opaleye/Internal/Manipulation.hs
{-# LANGUAGE GADTs #-}
module Opaleye.Internal.Manipulation where
import qualified Control.Applicative as A
import Opaleye.Internal.Column (Field_(Column), Field)
import qualified Opaleye.Internal.HaskellDB.Sql as HSql
import qualified Opaleye.Internal.HaskellDB.Sql.Default as SD
import qualified Opaleye.Internal.HaskellDB.Sql.Generate as SG
import qualified Opaleye.Internal.HaskellDB.Sql.Print as HPrint
import Opaleye.Internal.Helpers ((.:), (.:.), (.::.), (.::))
import qualified Opaleye.Internal.PrimQuery as PQ
import qualified Opaleye.Internal.Print as Print
import qualified Opaleye.Internal.RunQuery as IRQ
import qualified Opaleye.RunSelect as RS
import qualified Opaleye.Internal.Sql as Sql
import qualified Opaleye.Internal.Table as TI
import qualified Opaleye.Internal.Unpackspec as U
import qualified Opaleye.Table as T
import Opaleye.SqlTypes (SqlBool)
import Data.Int (Int64)
import qualified Data.List.NonEmpty as NEL
import Data.Profunctor (Profunctor, dimap)
import qualified Data.Profunctor.Product as PP
import qualified Data.Profunctor.Product.Default as D
import Data.String (fromString)
import qualified Database.PostgreSQL.Simple as PGS
-- | Represents a @RETURNING@ statement for a manipulation query.
data Returning fields haskells where
Count
:: Returning a Int64
ReturningExplicit
:: RS.FromFields b c -> (a -> b) -> Returning a [c]
arrangeInsertMany :: T.Table columns a
-> NEL.NonEmpty columns
-> Maybe HSql.OnConflict
-> HSql.SqlInsert
arrangeInsertMany table columns onConflict = insert
where writer = TI.tableColumnsWriter (TI.tableColumns table)
(columnExprs, columnNames) = TI.runWriter' writer columns
insert = SG.sqlInsert SD.defaultSqlGenerator
(PQ.tiToSqlTable (TI.tableIdentifier table))
columnNames columnExprs
onConflict
arrangeInsertManyReturning :: U.Unpackspec columnsReturned ignored
-> T.Table columnsW columnsR
-> NEL.NonEmpty columnsW
-> (columnsR -> columnsReturned)
-> Maybe HSql.OnConflict
-> Sql.Returning HSql.SqlInsert
arrangeInsertManyReturning unpackspec table columns returningf onConflict =
Sql.Returning insert returningSEs
where insert = arrangeInsertMany table columns onConflict
TI.View columnsR = TI.tableColumnsView (TI.tableColumns table)
returningPEs = U.collectPEs unpackspec (returningf columnsR)
returningSEs = Sql.ensureColumnsGen id (map Sql.sqlExpr returningPEs)
arrangeInsertManyReturningSql :: U.Unpackspec columnsReturned ignored
-> T.Table columnsW columnsR
-> NEL.NonEmpty columnsW
-> (columnsR -> columnsReturned)
-> Maybe HSql.OnConflict
-> String
arrangeInsertManyReturningSql =
show . Print.ppInsertReturning .::. arrangeInsertManyReturning
arrangeInsertManySql :: T.Table columnsW columnsR
-> NEL.NonEmpty columnsW
-> Maybe HSql.OnConflict
-> String
arrangeInsertManySql =
show . HPrint.ppInsert .:. arrangeInsertMany
runInsertManyReturningExplicit
:: RS.FromFields columnsReturned haskells
-> PGS.Connection
-> T.Table columnsW columnsR
-> [columnsW]
-> (columnsR -> columnsReturned)
-> Maybe HSql.OnConflict
-> IO [haskells]
runInsertManyReturningExplicit
qr conn t columns r onConflict =
case NEL.nonEmpty columns of
Nothing -> return []
Just columns' -> PGS.queryWith_ parser conn
(fromString
(arrangeInsertManyReturningSql u t columns' r
onConflict))
where IRQ.FromFields u _ _ = qr
parser = IRQ.prepareRowParser qr (r v)
TI.View v = TI.tableColumnsView (TI.tableColumns t)
-- This method of getting hold of the return type feels a bit
-- suspect. I haven't checked it for validity.
newtype Updater a b = Updater (a -> b)
-- { Boilerplate instances
instance Functor (Updater a) where
fmap f (Updater g) = Updater (fmap f g)
instance A.Applicative (Updater a) where
pure = Updater . A.pure
Updater f <*> Updater x = Updater (f A.<*> x)
instance Profunctor Updater where
dimap f g (Updater h) = Updater (dimap f g h)
instance PP.ProductProfunctor Updater where
purePP = pure
(****) = (<*>)
--
instance D.Default Updater (Field_ n a) (Field_ n a) where
def = Updater id
instance D.Default Updater (Field_ n a) (Maybe (Field_ n a)) where
def = Updater Just
arrangeDeleteReturning :: U.Unpackspec columnsReturned ignored
-> T.Table columnsW columnsR
-> (columnsR -> Field SqlBool)
-> (columnsR -> columnsReturned)
-> Sql.Returning HSql.SqlDelete
-- this implementation was copied, it does not make sense yet
arrangeDeleteReturning unpackspec t cond returningf =
Sql.Returning delete returningSEs
where delete = arrangeDelete t cond
TI.View columnsR = TI.tableColumnsView (TI.tableColumns t)
returningPEs = U.collectPEs unpackspec (returningf columnsR)
returningSEs = Sql.ensureColumnsGen id (map Sql.sqlExpr returningPEs)
arrangeDeleteReturningSql :: U.Unpackspec columnsReturned ignored
-> T.Table columnsW columnsR
-> (columnsR -> Field SqlBool)
-> (columnsR -> columnsReturned)
-> String
arrangeDeleteReturningSql =
show . Print.ppDeleteReturning .:: arrangeDeleteReturning
runDeleteReturning :: (D.Default RS.FromFields columnsReturned haskells)
=> PGS.Connection
-- ^
-> T.Table a columnsR
-- ^ Table to delete rows from
-> (columnsR -> Field SqlBool)
-- ^ Predicate function @f@ to choose which rows to delete.
-- 'runDeleteReturning' will delete rows for which @f@ returns @TRUE@
-- and leave unchanged rows for
-- which @f@ returns @FALSE@.
-> (columnsR -> columnsReturned)
-> IO [haskells]
-- ^ Returned rows which have been deleted
runDeleteReturning = runDeleteReturningExplicit D.def
runDeleteReturningExplicit :: RS.FromFields columnsReturned haskells
-> PGS.Connection
-> T.Table a columnsR
-> (columnsR -> Field SqlBool)
-> (columnsR -> columnsReturned)
-> IO [haskells]
runDeleteReturningExplicit qr conn t cond r =
PGS.queryWith_ parser conn
(fromString (arrangeDeleteReturningSql u t cond r))
where IRQ.FromFields u _ _ = qr
parser = IRQ.prepareRowParser qr (r v)
TI.View v = TI.tableColumnsView (TI.tableColumns t)
arrangeDelete :: T.Table a columnsR -> (columnsR -> Field SqlBool) -> HSql.SqlDelete
arrangeDelete t cond =
SG.sqlDelete SD.defaultSqlGenerator (PQ.tiToSqlTable (TI.tableIdentifier t)) [condExpr]
where Column condExpr = cond tableCols
TI.View tableCols = TI.tableColumnsView (TI.tableColumns t)
arrangeUpdate :: T.Table columnsW columnsR
-> (columnsR -> columnsW) -> (columnsR -> Field SqlBool)
-> HSql.SqlUpdate
arrangeUpdate t update cond =
SG.sqlUpdate SD.defaultSqlGenerator
(PQ.tiToSqlTable (TI.tableIdentifier t))
[condExpr] (update' tableCols)
where TI.TableFields writer (TI.View tableCols) = TI.tableColumns t
update' = map (\(x, y) -> (y, x)) . TI.runWriter writer . update
Column condExpr = cond tableCols
arrangeUpdateSql :: T.Table columnsW columnsR
-> (columnsR -> columnsW) -> (columnsR -> Field SqlBool)
-> String
arrangeUpdateSql = show . HPrint.ppUpdate .:. arrangeUpdate
arrangeDeleteSql :: T.Table a columnsR -> (columnsR -> Field SqlBool) -> String
arrangeDeleteSql = show . HPrint.ppDelete .: arrangeDelete
arrangeUpdateReturning :: U.Unpackspec columnsReturned ignored
-> T.Table columnsW columnsR
-> (columnsR -> columnsW)
-> (columnsR -> Field SqlBool)
-> (columnsR -> columnsReturned)
-> Sql.Returning HSql.SqlUpdate
arrangeUpdateReturning unpackspec t updatef cond returningf =
Sql.Returning update returningSEs
where update = arrangeUpdate t updatef cond
TI.View columnsR = TI.tableColumnsView (TI.tableColumns t)
returningPEs = U.collectPEs unpackspec (returningf columnsR)
returningSEs = Sql.ensureColumnsGen id (map Sql.sqlExpr returningPEs)
arrangeUpdateReturningSql :: U.Unpackspec columnsReturned ignored
-> T.Table columnsW columnsR
-> (columnsR -> columnsW)
-> (columnsR -> Field SqlBool)
-> (columnsR -> columnsReturned)
-> String
arrangeUpdateReturningSql =
show . Print.ppUpdateReturning .::. arrangeUpdateReturning