{-# language DuplicateRecordFields #-}
{-# language FlexibleContexts #-}
{-# language GADTs #-}
{-# language LambdaCase #-}
{-# language NamedFieldPuns #-}
{-# language RecordWildCards #-}
{-# language StandaloneKindSignatures #-}
{-# language StrictData #-}
module Rel8.Statement.OnConflict
( OnConflict(..)
, Upsert(..)
, ppOnConflict
)
where
import Data.Foldable ( toList )
import Data.Kind ( Type )
import Prelude
import qualified Opaleye.Internal.HaskellDB.Sql.Print as Opaleye
import Text.PrettyPrint ( Doc, (<+>), ($$), parens, text )
import Rel8.Expr ( Expr )
import Rel8.Schema.Name ( Name, Selects, ppColumn )
import Rel8.Schema.Table ( TableSchema(..) )
import Rel8.Statement.Set ( ppSet )
import Rel8.Statement.Where ( ppWhere )
import Rel8.Table ( Table, toColumns )
import Rel8.Table.Cols ( Cols( Cols ) )
import Rel8.Table.Name ( showNames )
import Rel8.Table.Opaleye ( attributes )
import Rel8.Table.Projection ( Projecting, Projection, apply )
type OnConflict :: Type -> Type
data OnConflict names
= Abort
| DoNothing
| DoUpdate (Upsert names)
type Upsert :: Type -> Type
data Upsert names where
Upsert :: (Selects names exprs, Projecting names index, excluded ~ exprs) =>
{ ()
index :: Projection names index
, ()
set :: excluded -> exprs -> exprs
, ()
updateWhere :: excluded -> exprs -> Expr Bool
}
-> Upsert names
ppOnConflict :: TableSchema names -> OnConflict names -> Doc
ppOnConflict :: TableSchema names -> OnConflict names -> Doc
ppOnConflict TableSchema names
schema = \case
OnConflict names
Abort -> Doc
forall a. Monoid a => a
mempty
OnConflict names
DoNothing -> String -> Doc
text String
"ON CONFLICT DO NOTHING"
DoUpdate Upsert names
upsert -> TableSchema names -> Upsert names -> Doc
forall names. TableSchema names -> Upsert names -> Doc
ppUpsert TableSchema names
schema Upsert names
upsert
ppUpsert :: TableSchema names -> Upsert names -> Doc
ppUpsert :: TableSchema names -> Upsert names -> Doc
ppUpsert schema :: TableSchema names
schema@TableSchema {names
columns :: forall names. TableSchema names -> names
columns :: names
columns} Upsert {excluded -> exprs -> exprs
excluded -> exprs -> Expr Bool
Projection names index
updateWhere :: excluded -> exprs -> Expr Bool
set :: excluded -> exprs -> exprs
index :: Projection names index
$sel:updateWhere:Upsert :: ()
$sel:set:Upsert :: ()
$sel:index:Upsert :: ()
..} =
String -> Doc
text String
"ON CONFLICT" Doc -> Doc -> Doc
<+>
TableSchema names -> Projection names index -> Doc
forall names index.
(Table Name names, Projecting names index) =>
TableSchema names -> Projection names index -> Doc
ppIndex TableSchema names
schema Projection names index
index Doc -> Doc -> Doc
<+>
String -> Doc
text String
"DO UPDATE" Doc -> Doc -> Doc
$$
TableSchema names -> (exprs -> exprs) -> Doc
forall names exprs.
Selects names exprs =>
TableSchema names -> (exprs -> exprs) -> Doc
ppSet TableSchema names
schema (excluded -> exprs -> exprs
set excluded
excluded) Doc -> Doc -> Doc
$$
TableSchema names -> (exprs -> Expr Bool) -> Doc
forall names exprs.
Selects names exprs =>
TableSchema names -> (exprs -> Expr Bool) -> Doc
ppWhere TableSchema names
schema (excluded -> exprs -> Expr Bool
updateWhere excluded
excluded)
where
excluded :: excluded
excluded = TableSchema names -> excluded
forall names exprs.
Selects names exprs =>
TableSchema names -> exprs
attributes TableSchema :: forall names. String -> Maybe String -> names -> TableSchema names
TableSchema
{ schema :: Maybe String
schema = Maybe String
forall a. Maybe a
Nothing
, name :: String
name = String
"excluded"
, names
columns :: names
columns :: names
columns
}
ppIndex :: (Table Name names, Projecting names index)
=> TableSchema names -> Projection names index -> Doc
ppIndex :: TableSchema names -> Projection names index -> Doc
ppIndex TableSchema {names
columns :: names
columns :: forall names. TableSchema names -> names
columns} Projection names index
index =
Doc -> Doc
parens (Doc -> Doc) -> Doc -> Doc
forall a b. (a -> b) -> a -> b
$ (String -> Doc) -> [String] -> Doc
forall a. (a -> Doc) -> [a] -> Doc
Opaleye.commaV String -> Doc
ppColumn ([String] -> Doc) -> [String] -> Doc
forall a b. (a -> b) -> a -> b
$ NonEmpty String -> [String]
forall (t :: * -> *) a. Foldable t => t a -> [a]
toList (NonEmpty String -> [String]) -> NonEmpty String -> [String]
forall a b. (a -> b) -> a -> b
$
Cols Name (Columns index) -> NonEmpty String
forall a. Table Name a => a -> NonEmpty String
showNames (Cols Name (Columns index) -> NonEmpty String)
-> Cols Name (Columns index) -> NonEmpty String
forall a b. (a -> b) -> a -> b
$ Columns index Name -> Cols Name (Columns index)
forall (context :: * -> *) (columns :: HTable).
columns context -> Cols context columns
Cols (Columns index Name -> Cols Name (Columns index))
-> Columns index Name -> Cols Name (Columns index)
forall a b. (a -> b) -> a -> b
$ Projection names index -> Columns names Name -> Columns index Name
forall a b (context :: * -> *).
Projecting a b =>
Projection a b -> Columns a context -> Columns b context
apply Projection names index
index (Columns names Name -> Columns index Name)
-> Columns names Name -> Columns index Name
forall a b. (a -> b) -> a -> b
$ names -> Columns names Name
forall (context :: * -> *) a.
Table context a =>
a -> Columns a context
toColumns names
columns