mirror of
https://github.com/hasura/graphql-engine.git
synced 2024-12-17 20:41:49 +03:00
ed26da59a6
These changes also add a new type, PGColumnType, between PGColInfo and PGScalarType, and they process PGRawColumnType values into PGColumnType values during schema cache generation.
779 lines
19 KiB
Haskell
779 lines
19 KiB
Haskell
module Hasura.SQL.DML where
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import Hasura.Prelude
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import Hasura.SQL.Types
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import Data.String (fromString)
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import Language.Haskell.TH.Syntax (Lift)
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import qualified Data.Aeson as J
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import qualified Data.HashMap.Strict as HM
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import qualified Data.Text.Extended as T
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import qualified Text.Builder as TB
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infixr 6 <->
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(<->) :: TB.Builder -> TB.Builder -> TB.Builder
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(<->) l r = l <> TB.char ' ' <> r
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{-# INLINE (<->) #-}
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paren :: TB.Builder -> TB.Builder
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paren t = TB.char '(' <> t <> TB.char ')'
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{-# INLINE paren #-}
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data Select
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= Select
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{ selDistinct :: !(Maybe DistinctExpr)
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, selExtr :: ![Extractor]
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, selFrom :: !(Maybe FromExp)
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, selWhere :: !(Maybe WhereFrag)
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, selGroupBy :: !(Maybe GroupByExp)
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, selHaving :: !(Maybe HavingExp)
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, selOrderBy :: !(Maybe OrderByExp)
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, selLimit :: !(Maybe LimitExp)
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, selOffset :: !(Maybe OffsetExp)
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} deriving (Show, Eq, Data)
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mkSelect :: Select
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mkSelect = Select Nothing [] Nothing
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Nothing Nothing Nothing
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Nothing Nothing Nothing
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newtype LimitExp
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= LimitExp SQLExp
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deriving (Show, Eq, Data)
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instance ToSQL LimitExp where
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toSQL (LimitExp se) =
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"LIMIT" <-> toSQL se
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newtype OffsetExp
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= OffsetExp SQLExp
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deriving (Show, Eq, Data)
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instance ToSQL OffsetExp where
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toSQL (OffsetExp se) =
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"OFFSET" <-> toSQL se
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newtype OrderByExp
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= OrderByExp [OrderByItem]
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deriving (Show, Eq, Data)
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data OrderByItem
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= OrderByItem
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{ oColumn :: !SQLExp
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, oType :: !(Maybe OrderType)
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, oNulls :: !(Maybe NullsOrder)
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} deriving (Show, Eq, Data)
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instance ToSQL OrderByItem where
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toSQL (OrderByItem e ot no) =
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toSQL e <-> toSQL ot <-> toSQL no
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data OrderType = OTAsc
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| OTDesc
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deriving (Show, Eq, Lift, Data)
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instance ToSQL OrderType where
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toSQL OTAsc = "ASC"
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toSQL OTDesc = "DESC"
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data NullsOrder
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= NFirst
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| NLast
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deriving (Show, Eq, Lift, Data)
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instance ToSQL NullsOrder where
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toSQL NFirst = "NULLS FIRST"
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toSQL NLast = "NULLS LAST"
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instance ToSQL OrderByExp where
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toSQL (OrderByExp l) =
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"ORDER BY" <-> (", " <+> l)
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newtype GroupByExp
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= GroupByExp [SQLExp]
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deriving (Show, Eq, Data)
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instance ToSQL GroupByExp where
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toSQL (GroupByExp idens) =
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"GROUP BY" <-> (", " <+> idens)
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newtype FromExp
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= FromExp [FromItem]
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deriving (Show, Eq, Data)
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instance ToSQL FromExp where
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toSQL (FromExp items) =
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"FROM" <-> (", " <+> items)
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mkIdenFromExp :: (IsIden a) => a -> FromExp
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mkIdenFromExp a =
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FromExp [FIIden $ toIden a]
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mkSimpleFromExp :: QualifiedTable -> FromExp
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mkSimpleFromExp qt =
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FromExp [FISimple qt Nothing]
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mkSelFromExp :: Bool -> Select -> TableName -> FromItem
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mkSelFromExp isLateral sel tn =
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FISelect (Lateral isLateral) sel alias
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where
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alias = Alias $ toIden tn
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mkFuncFromItem :: QualifiedFunction -> [SQLExp] -> FromItem
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mkFuncFromItem qf args =
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FIFunc qf args Nothing
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mkRowExp :: [Extractor] -> SQLExp
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mkRowExp extrs = let
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innerSel = mkSelect { selExtr = extrs }
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innerSelName = TableName "e"
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-- SELECT r FROM (SELECT col1, col2, .. ) AS r
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outerSel = mkSelect
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{ selExtr = [Extractor (SERowIden $ toIden innerSelName) Nothing]
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, selFrom = Just $ FromExp
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[mkSelFromExp False innerSel innerSelName]
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}
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in
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SESelect outerSel
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newtype HavingExp
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= HavingExp BoolExp
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deriving (Show, Eq, Data)
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instance ToSQL HavingExp where
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toSQL (HavingExp be) =
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"HAVING" <-> toSQL be
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newtype WhereFrag
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= WhereFrag { getWFBoolExp :: BoolExp }
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deriving (Show, Eq, Data)
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instance ToSQL WhereFrag where
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toSQL (WhereFrag be) =
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"WHERE" <-> paren (toSQL be)
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instance ToSQL Select where
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toSQL sel =
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"SELECT"
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<-> toSQL (selDistinct sel)
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<-> (", " <+> selExtr sel)
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<-> toSQL (selFrom sel)
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<-> toSQL (selWhere sel)
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<-> toSQL (selGroupBy sel)
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<-> toSQL (selHaving sel)
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<-> toSQL (selOrderBy sel)
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<-> toSQL (selLimit sel)
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<-> toSQL (selOffset sel)
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mkSIdenExp :: (IsIden a) => a -> SQLExp
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mkSIdenExp = SEIden . toIden
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mkQIdenExp :: (IsIden a, IsIden b) => a -> b -> SQLExp
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mkQIdenExp q t = SEQIden $ mkQIden q t
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data Qual
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= QualIden !Iden
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| QualTable !QualifiedTable
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| QualVar !T.Text
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deriving (Show, Eq, Data)
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mkQual :: QualifiedTable -> Qual
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mkQual = QualTable
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instance ToSQL Qual where
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toSQL (QualIden i) = toSQL i
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toSQL (QualTable qt) = toSQL qt
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toSQL (QualVar v) = TB.text v
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mkQIden :: (IsIden a, IsIden b) => a -> b -> QIden
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mkQIden q t = QIden (QualIden (toIden q)) (toIden t)
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data QIden
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= QIden !Qual !Iden
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deriving (Show, Eq, Data)
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instance ToSQL QIden where
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toSQL (QIden qual iden) =
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mconcat [toSQL qual, TB.char '.', toSQL iden]
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newtype SQLOp
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= SQLOp {sqlOpTxt :: T.Text}
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deriving (Show, Eq, Data)
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incOp :: SQLOp
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incOp = SQLOp "+"
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mulOp :: SQLOp
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mulOp = SQLOp "*"
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jsonbPathOp :: SQLOp
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jsonbPathOp = SQLOp "#>"
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jsonbConcatOp :: SQLOp
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jsonbConcatOp = SQLOp "||"
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jsonbDeleteOp :: SQLOp
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jsonbDeleteOp = SQLOp "-"
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jsonbDeleteAtPathOp :: SQLOp
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jsonbDeleteAtPathOp = SQLOp "#-"
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newtype TypeAnn
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= TypeAnn {unTypeAnn :: T.Text}
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deriving (Show, Eq, Data)
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mkTypeAnn :: PGType PGScalarType -> TypeAnn
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mkTypeAnn = TypeAnn . toSQLTxt
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intTypeAnn :: TypeAnn
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intTypeAnn = mkTypeAnn $ PGTypeSimple PGInteger
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textTypeAnn :: TypeAnn
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textTypeAnn = mkTypeAnn $ PGTypeSimple PGText
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textArrTypeAnn :: TypeAnn
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textArrTypeAnn = mkTypeAnn $ PGTypeArray PGText
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jsonTypeAnn :: TypeAnn
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jsonTypeAnn = mkTypeAnn $ PGTypeSimple PGJSON
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jsonbTypeAnn :: TypeAnn
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jsonbTypeAnn = mkTypeAnn $ PGTypeSimple PGJSONB
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data CountType
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= CTStar
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| CTSimple ![PGCol]
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| CTDistinct ![PGCol]
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deriving(Show, Eq, Data)
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instance ToSQL CountType where
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toSQL CTStar = "*"
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toSQL (CTSimple cols) =
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paren $ ", " <+> cols
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toSQL (CTDistinct cols) =
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"DISTINCT" <-> paren (", " <+> cols)
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newtype TupleExp
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= TupleExp [SQLExp]
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deriving (Show, Eq, Data)
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instance ToSQL TupleExp where
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toSQL (TupleExp exps) =
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paren $ ", " <+> exps
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data SQLExp
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= SEPrep !Int
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| SENull
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| SELit !T.Text
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| SEUnsafe !T.Text
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| SESelect !Select
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| SEStar
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| SEIden !Iden
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-- iden and row identifier are distinguished for easier rewrite rules
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| SERowIden !Iden
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| SEQIden !QIden
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| SEFnApp !T.Text ![SQLExp] !(Maybe OrderByExp)
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| SEOpApp !SQLOp ![SQLExp]
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| SETyAnn !SQLExp !TypeAnn
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| SECond !BoolExp !SQLExp !SQLExp
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| SEBool !BoolExp
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| SEExcluded !T.Text
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| SEArray ![SQLExp]
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| SETuple !TupleExp
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| SECount !CountType
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deriving (Show, Eq, Data)
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withTyAnn :: PGScalarType -> SQLExp -> SQLExp
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withTyAnn colTy v = SETyAnn v . mkTypeAnn $ PGTypeSimple colTy
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instance J.ToJSON SQLExp where
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toJSON = J.toJSON . toSQLTxt
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newtype Alias
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= Alias { getAlias :: Iden }
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deriving (Show, Eq, Hashable, Data)
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instance IsIden Alias where
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toIden (Alias iden) = iden
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instance ToSQL Alias where
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toSQL (Alias iden) = "AS" <-> toSQL iden
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toAlias :: (IsIden a) => a -> Alias
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toAlias = Alias . toIden
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countStar :: SQLExp
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countStar = SECount CTStar
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instance ToSQL SQLExp where
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toSQL (SEPrep argNumber) =
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TB.char '$' <> fromString (show argNumber)
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toSQL SENull =
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TB.text "null"
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toSQL (SELit tv) =
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TB.text $ pgFmtLit tv
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toSQL (SEUnsafe t) =
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TB.text t
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toSQL (SESelect se) =
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paren $ toSQL se
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toSQL SEStar =
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TB.char '*'
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toSQL (SEIden iden) =
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toSQL iden
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toSQL (SERowIden iden) =
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toSQL iden
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toSQL (SEQIden qIden) =
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toSQL qIden
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-- https://www.postgresql.org/docs/10/static/sql-expressions.html#SYNTAX-AGGREGATES
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toSQL (SEFnApp name args mObe) =
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TB.text name <> paren ((", " <+> args) <-> toSQL mObe)
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toSQL (SEOpApp op args) =
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paren (sqlOpTxt op <+> args)
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toSQL (SETyAnn e ty) =
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paren (toSQL e) <> "::" <> TB.text (unTypeAnn ty)
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toSQL (SECond cond te fe) =
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"CASE WHEN" <-> toSQL cond <->
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"THEN" <-> toSQL te <->
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"ELSE" <-> toSQL fe <->
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"END"
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toSQL (SEBool be) = toSQL be
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toSQL (SEExcluded t) = "EXCLUDED."
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<> toSQL (PGCol t)
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toSQL (SEArray exps) = "ARRAY" <> TB.char '['
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<> (", " <+> exps) <> TB.char ']'
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toSQL (SETuple tup) = toSQL tup
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toSQL (SECount ty) = "COUNT" <> paren (toSQL ty)
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intToSQLExp :: Int -> SQLExp
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intToSQLExp =
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SEUnsafe . T.pack . show
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data Extractor = Extractor !SQLExp !(Maybe Alias)
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deriving (Show, Eq, Data)
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mkSQLOpExp
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:: SQLOp
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-> SQLExp -- lhs
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-> SQLExp -- rhs
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-> SQLExp -- result
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mkSQLOpExp op lhs rhs = SEOpApp op [lhs, rhs]
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mkColDefValMap :: [PGCol] -> HM.HashMap PGCol SQLExp
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mkColDefValMap cols =
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HM.fromList $ zip cols (repeat $ SEUnsafe "DEFAULT")
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handleIfNull :: SQLExp -> SQLExp -> SQLExp
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handleIfNull l e = SEFnApp "coalesce" [e, l] Nothing
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applyJsonBuildObj :: [SQLExp] -> SQLExp
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applyJsonBuildObj args =
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SEFnApp "json_build_object" args Nothing
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applyRowToJson :: [Extractor] -> SQLExp
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applyRowToJson extrs =
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SEFnApp "row_to_json" [mkRowExp extrs] Nothing
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getExtrAlias :: Extractor -> Maybe Alias
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getExtrAlias (Extractor _ ma) = ma
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mkAliasedExtr :: (IsIden a, IsIden b) => a -> Maybe b -> Extractor
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mkAliasedExtr t = mkAliasedExtrFromExp (mkSIdenExp t)
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mkAliasedExtrFromExp :: (IsIden a) => SQLExp -> Maybe a -> Extractor
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mkAliasedExtrFromExp sqlExp ma = Extractor sqlExp (aliasF <$> ma)
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where
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aliasF = Alias . toIden
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mkExtr :: (IsIden a) => a -> Extractor
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mkExtr t = Extractor (mkSIdenExp t) Nothing
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instance ToSQL Extractor where
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toSQL (Extractor ce mal) =
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toSQL ce <-> toSQL mal
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data DistinctExpr
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= DistinctSimple
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| DistinctOn ![SQLExp]
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deriving (Show, Eq, Data)
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instance ToSQL DistinctExpr where
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toSQL DistinctSimple = "DISTINCT"
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toSQL (DistinctOn exps) =
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"DISTINCT ON" <-> paren ("," <+> exps)
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data FromItem
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= FISimple !QualifiedTable !(Maybe Alias)
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| FIIden !Iden
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| FIFunc !QualifiedFunction ![SQLExp] !(Maybe Alias)
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| FIUnnest ![SQLExp] !Alias ![SQLExp]
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| FISelect !Lateral !Select !Alias
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| FIValues !ValuesExp !Alias !(Maybe [PGCol])
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| FIJoin !JoinExpr
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deriving (Show, Eq, Data)
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mkSelFromItem :: Select -> Alias -> FromItem
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mkSelFromItem = FISelect (Lateral False)
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mkLateralFromItem :: Select -> Alias -> FromItem
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mkLateralFromItem = FISelect (Lateral True)
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toColTupExp :: [PGCol] -> SQLExp
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toColTupExp =
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SETuple . TupleExp . map (SEIden . Iden . getPGColTxt)
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instance ToSQL FromItem where
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toSQL (FISimple qt mal) =
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toSQL qt <-> toSQL mal
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toSQL (FIIden iden) =
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toSQL iden
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toSQL (FIFunc qf args mal) =
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toSQL qf <> paren (", " <+> args) <-> toSQL mal
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-- unnest(expressions) alias(columns)
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toSQL (FIUnnest args als cols) =
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"UNNEST" <> paren (", " <+> args) <-> toSQL als <> paren (", " <+> cols)
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toSQL (FISelect mla sel al) =
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toSQL mla <-> paren (toSQL sel) <-> toSQL al
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toSQL (FIValues valsExp al mCols) =
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paren (toSQL valsExp) <-> toSQL al
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<-> toSQL (toColTupExp <$> mCols)
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toSQL (FIJoin je) =
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toSQL je
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newtype Lateral = Lateral Bool
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deriving (Show, Eq, Data)
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instance ToSQL Lateral where
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toSQL (Lateral True) = "LATERAL"
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toSQL (Lateral False) = mempty
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data JoinExpr
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= JoinExpr
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{ tjeLeft :: !FromItem
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, tjeType :: !JoinType
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, tjeRight :: !FromItem
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, tjeJC :: !JoinCond
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} deriving (Show, Eq, Data)
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instance ToSQL JoinExpr where
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toSQL je =
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toSQL (tjeLeft je)
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<-> toSQL (tjeType je)
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<-> toSQL (tjeRight je)
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<-> toSQL (tjeJC je)
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data JoinType
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= Inner
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| LeftOuter
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| RightOuter
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| FullOuter
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deriving (Eq, Show, Data)
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instance ToSQL JoinType where
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toSQL Inner = "INNER JOIN"
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toSQL LeftOuter = "LEFT OUTER JOIN"
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toSQL RightOuter = "RIGHT OUTER JOIN"
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toSQL FullOuter = "FULL OUTER JOIN"
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data JoinCond
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= JoinOn !BoolExp
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| JoinUsing ![PGCol]
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deriving (Show, Eq, Data)
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instance ToSQL JoinCond where
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toSQL (JoinOn be) =
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"ON" <-> paren (toSQL be)
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toSQL (JoinUsing cols) =
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"USING" <-> paren ("," <+> cols)
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data BoolExp
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= BELit !Bool
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| BEBin !BinOp !BoolExp !BoolExp
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| BENot !BoolExp
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| BECompare !CompareOp !SQLExp !SQLExp
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-- this is because l = (ANY (e)) is not valid
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-- i.e, (ANY(e)) is not same as ANY(e)
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| BECompareAny !CompareOp !SQLExp !SQLExp
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| BENull !SQLExp
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| BENotNull !SQLExp
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| BEExists !Select
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| BEIN !SQLExp ![SQLExp]
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| BEExp !SQLExp
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deriving (Show, Eq, Data)
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-- removes extraneous 'AND true's
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simplifyBoolExp :: BoolExp -> BoolExp
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simplifyBoolExp be = case be of
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BEBin AndOp e1 e2 ->
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let e1s = simplifyBoolExp e1
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e2s = simplifyBoolExp e2
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in if
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| e1s == BELit True -> e2s
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| e2s == BELit True -> e1s
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| otherwise -> BEBin AndOp e1s e2s
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BEBin OrOp e1 e2 ->
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let e1s = simplifyBoolExp e1
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e2s = simplifyBoolExp e2
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in if
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| e1s == BELit False -> e2s
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| e2s == BELit False -> e1s
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| otherwise -> BEBin OrOp e1s e2s
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e -> e
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mkExists :: FromItem -> BoolExp -> BoolExp
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mkExists fromItem whereFrag =
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BEExists mkSelect
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{ selExtr = [Extractor (SEUnsafe "1") Nothing]
|
|
, selFrom = Just $ FromExp $ pure fromItem
|
|
, selWhere = Just $ WhereFrag whereFrag
|
|
}
|
|
|
|
instance ToSQL BoolExp where
|
|
toSQL (BELit True) = TB.text $ T.squote "true"
|
|
toSQL (BELit False) = TB.text $ T.squote "false"
|
|
toSQL (BEBin bo bel ber) =
|
|
paren (toSQL bel) <-> toSQL bo <-> paren (toSQL ber)
|
|
toSQL (BENot be) =
|
|
"NOT" <-> paren (toSQL be)
|
|
toSQL (BECompare co vl vr) =
|
|
paren (toSQL vl) <-> toSQL co <-> paren (toSQL vr)
|
|
toSQL (BECompareAny co vl vr) =
|
|
paren (toSQL vl) <-> toSQL co <-> "ANY" <> paren (toSQL vr)
|
|
toSQL (BENull v) =
|
|
paren (toSQL v) <-> "IS NULL"
|
|
toSQL (BENotNull v) =
|
|
paren (toSQL v) <-> "IS NOT NULL"
|
|
toSQL (BEExists sel) =
|
|
"EXISTS " <-> paren (toSQL sel)
|
|
-- special case to handle lhs IN (exp1, exp2)
|
|
toSQL (BEIN vl exps) =
|
|
paren (toSQL vl) <-> toSQL SIN <-> paren (", " <+> exps)
|
|
-- Any SQL expression which evaluates to bool value
|
|
toSQL (BEExp e) = paren $ toSQL e
|
|
|
|
data BinOp = AndOp
|
|
| OrOp
|
|
deriving (Show, Eq, Data)
|
|
|
|
instance ToSQL BinOp where
|
|
toSQL AndOp = "AND"
|
|
toSQL OrOp = "OR"
|
|
|
|
data CompareOp
|
|
= SEQ
|
|
| SGT
|
|
| SLT
|
|
| SIN
|
|
| SNE
|
|
| SLIKE
|
|
| SNLIKE
|
|
| SILIKE
|
|
| SNILIKE
|
|
| SSIMILAR
|
|
| SNSIMILAR
|
|
| SGTE
|
|
| SLTE
|
|
| SNIN
|
|
| SContains
|
|
| SContainedIn
|
|
| SHasKey
|
|
| SHasKeysAny
|
|
| SHasKeysAll
|
|
deriving (Eq, Data)
|
|
|
|
instance Show CompareOp where
|
|
show = \case
|
|
SEQ -> "="
|
|
SGT -> ">"
|
|
SLT -> "<"
|
|
SIN -> "IN"
|
|
SNE -> "<>"
|
|
SGTE -> ">="
|
|
SLTE -> "<="
|
|
SNIN -> "NOT IN"
|
|
SLIKE -> "LIKE"
|
|
SNLIKE -> "NOT LIKE"
|
|
SILIKE -> "ILIKE"
|
|
SNILIKE -> "NOT ILIKE"
|
|
SSIMILAR -> "SIMILAR TO"
|
|
SNSIMILAR -> "NOT SIMILAR TO"
|
|
SContains -> "@>"
|
|
SContainedIn -> "<@"
|
|
SHasKey -> "?"
|
|
SHasKeysAny -> "?|"
|
|
SHasKeysAll -> "?&"
|
|
|
|
instance ToSQL CompareOp where
|
|
toSQL = fromString . show
|
|
|
|
buildInsVal :: PGCol -> Int -> (PGCol, SQLExp)
|
|
buildInsVal colName argNumber =
|
|
(colName, SEPrep argNumber)
|
|
|
|
data SQLDelete
|
|
= SQLDelete
|
|
{ delTable :: !QualifiedTable
|
|
, delUsing :: !(Maybe UsingExp)
|
|
, delWhere :: !(Maybe WhereFrag)
|
|
, delRet :: !(Maybe RetExp)
|
|
} deriving (Show, Eq)
|
|
|
|
data SQLUpdate
|
|
= SQLUpdate
|
|
{ upTable :: !QualifiedTable
|
|
, upSet :: !SetExp
|
|
, upFrom :: !(Maybe FromExp)
|
|
, upWhere :: !(Maybe WhereFrag)
|
|
, upRet :: !(Maybe RetExp)
|
|
} deriving (Show, Eq)
|
|
|
|
newtype SetExp = SetExp [SetExpItem]
|
|
deriving (Show, Eq)
|
|
|
|
newtype SetExpItem = SetExpItem (PGCol, SQLExp)
|
|
deriving (Show, Eq)
|
|
|
|
buildSEI :: PGCol -> Int -> SetExpItem
|
|
buildSEI colName argNumber =
|
|
SetExpItem (colName, SEPrep argNumber)
|
|
|
|
buildUpsertSetExp
|
|
:: [PGCol]
|
|
-> HM.HashMap PGCol SQLExp
|
|
-> SetExp
|
|
buildUpsertSetExp cols preSet =
|
|
SetExp $ map SetExpItem $ HM.toList setExps
|
|
where
|
|
setExps = HM.union preSet $ HM.fromList $
|
|
flip map cols $ \col ->
|
|
(col, SEExcluded $ getPGColTxt col)
|
|
|
|
|
|
newtype UsingExp = UsingExp [TableName]
|
|
deriving (Show, Eq)
|
|
|
|
instance ToSQL UsingExp where
|
|
toSQL (UsingExp tables)
|
|
= "USING" <-> "," <+> tables
|
|
|
|
newtype RetExp = RetExp [Extractor]
|
|
deriving (Show, Eq)
|
|
|
|
selectStar :: Extractor
|
|
selectStar = Extractor SEStar Nothing
|
|
|
|
returningStar :: RetExp
|
|
returningStar = RetExp [selectStar]
|
|
|
|
instance ToSQL RetExp where
|
|
toSQL (RetExp [])
|
|
= mempty
|
|
toSQL (RetExp exps)
|
|
= "RETURNING" <-> (", " <+> exps)
|
|
|
|
instance ToSQL SQLDelete where
|
|
toSQL sd = "DELETE FROM"
|
|
<-> toSQL (delTable sd)
|
|
<-> toSQL (delUsing sd)
|
|
<-> toSQL (delWhere sd)
|
|
<-> toSQL (delRet sd)
|
|
|
|
instance ToSQL SQLUpdate where
|
|
toSQL a = "UPDATE"
|
|
<-> toSQL (upTable a)
|
|
<-> toSQL (upSet a)
|
|
<-> toSQL (upFrom a)
|
|
<-> toSQL (upWhere a)
|
|
<-> toSQL (upRet a)
|
|
|
|
instance ToSQL SetExp where
|
|
toSQL (SetExp cvs) =
|
|
"SET" <-> ("," <+> cvs)
|
|
|
|
instance ToSQL SetExpItem where
|
|
toSQL (SetExpItem (col, val)) =
|
|
toSQL col <-> "=" <-> toSQL val
|
|
|
|
|
|
data SQLConflictTarget
|
|
= SQLColumn ![PGCol]
|
|
| SQLConstraint !ConstraintName
|
|
deriving (Show, Eq)
|
|
|
|
instance ToSQL SQLConflictTarget where
|
|
toSQL (SQLColumn cols) = "("
|
|
<-> ("," <+> cols)
|
|
<-> ")"
|
|
|
|
toSQL (SQLConstraint cons) = "ON CONSTRAINT" <-> toSQL cons
|
|
|
|
data SQLConflict
|
|
= DoNothing !(Maybe SQLConflictTarget)
|
|
| Update !SQLConflictTarget !SetExp !(Maybe WhereFrag)
|
|
deriving (Show, Eq)
|
|
|
|
instance ToSQL SQLConflict where
|
|
toSQL (DoNothing Nothing) = "ON CONFLICT DO NOTHING"
|
|
toSQL (DoNothing (Just ct)) = "ON CONFLICT"
|
|
<-> toSQL ct
|
|
<-> "DO NOTHING"
|
|
toSQL (Update ct set whr) = "ON CONFLICT"
|
|
<-> toSQL ct <-> "DO UPDATE"
|
|
<-> toSQL set <-> toSQL whr
|
|
|
|
newtype ValuesExp
|
|
= ValuesExp [TupleExp]
|
|
deriving (Show, Eq, Data)
|
|
|
|
instance ToSQL ValuesExp where
|
|
toSQL (ValuesExp tuples) =
|
|
"VALUES" <-> (", " <+> tuples)
|
|
|
|
data SQLInsert = SQLInsert
|
|
{ siTable :: !QualifiedTable
|
|
, siCols :: ![PGCol]
|
|
, siValues :: !ValuesExp
|
|
, siConflict :: !(Maybe SQLConflict)
|
|
, siRet :: !(Maybe RetExp)
|
|
} deriving (Show, Eq)
|
|
|
|
instance ToSQL SQLInsert where
|
|
toSQL si =
|
|
let insConflict = maybe "" toSQL
|
|
in "INSERT INTO"
|
|
<-> toSQL (siTable si)
|
|
<-> "("
|
|
<-> (", " <+> siCols si)
|
|
<-> ")"
|
|
<-> toSQL (siValues si)
|
|
<-> insConflict (siConflict si)
|
|
<-> toSQL (siRet si)
|
|
|
|
data CTE
|
|
= CTESelect !Select
|
|
| CTEInsert !SQLInsert
|
|
| CTEUpdate !SQLUpdate
|
|
| CTEDelete !SQLDelete
|
|
deriving (Show, Eq)
|
|
|
|
instance ToSQL CTE where
|
|
toSQL = \case
|
|
CTESelect q -> toSQL q
|
|
CTEInsert q -> toSQL q
|
|
CTEUpdate q -> toSQL q
|
|
CTEDelete q -> toSQL q
|
|
|
|
data SelectWith
|
|
= SelectWith
|
|
{ swCTEs :: [(Alias, CTE)]
|
|
, swSelect :: !Select
|
|
} deriving (Show, Eq)
|
|
|
|
instance ToSQL SelectWith where
|
|
toSQL (SelectWith ctes sel) =
|
|
"WITH " <> (", " <+> map f ctes) <-> toSQL sel
|
|
where
|
|
f (Alias al, q) = toSQL al <-> "AS" <-> paren (toSQL q)
|