-- Copyright : Daan Leijen (c) 1999, daan@cs.uu.nl -- HWT Group (c) 2003, haskelldb-users@lists.sourceforge.net -- License : BSD-style module Opaleye.Internal.HaskellDB.Sql.Default where import Opaleye.Internal.HaskellDB.PrimQuery import qualified Opaleye.Internal.HaskellDB.PrimQuery as PQ import Opaleye.Internal.HaskellDB.Sql import Opaleye.Internal.HaskellDB.Sql.Generate import qualified Opaleye.Internal.HaskellDB.Sql as Sql import Opaleye.Internal.Tag (tagWith) import Data.ByteString (ByteString) import qualified Data.ByteString.Char8 as BS8 import qualified Data.ByteString.Base16 as Base16 import qualified Data.List.NonEmpty as NEL mkSqlGenerator :: SqlGenerator -> SqlGenerator mkSqlGenerator gen = SqlGenerator { sqlUpdate = defaultSqlUpdate gen, sqlDelete = defaultSqlDelete gen, sqlInsert = defaultSqlInsert gen, sqlExpr = defaultSqlExpr gen, sqlLiteral = defaultSqlLiteral gen, sqlQuote = defaultSqlQuote gen } defaultSqlGenerator :: SqlGenerator defaultSqlGenerator = mkSqlGenerator defaultSqlGenerator toSqlOrder :: SqlGenerator -> OrderExpr -> (SqlExpr,SqlOrder) toSqlOrder gen (OrderExpr o e) = (sqlExpr gen e, Sql.SqlOrder { sqlOrderDirection = o' , sqlOrderNulls = orderNulls' }) where o' = case PQ.orderDirection o of PQ.OpAsc -> Sql.SqlAsc PQ.OpDesc -> Sql.SqlDesc orderNulls' = case PQ.orderNulls o of PQ.NullsFirst -> Sql.SqlNullsFirst PQ.NullsLast -> Sql.SqlNullsLast toSqlColumn :: Attribute -> SqlColumn toSqlColumn attr = SqlColumn attr toSqlAssoc :: SqlGenerator -> Assoc -> [(SqlColumn,SqlExpr)] toSqlAssoc gen = map (\(attr,expr) -> (toSqlColumn attr, sqlExpr gen expr)) defaultSqlUpdate :: SqlGenerator -> SqlTable -- ^ Table to update -> [PrimExpr] -- ^ Conditions which must all be true for a row -- to be updated. -> Assoc -- ^ Update the data with this. -> SqlUpdate defaultSqlUpdate gen tbl criteria assigns = SqlUpdate tbl (toSqlAssoc gen assigns) (map (sqlExpr gen) criteria) defaultSqlInsert :: SqlGenerator -> SqlTable -> [Attribute] -> NEL.NonEmpty [PrimExpr] -> SqlInsert defaultSqlInsert gen tbl attrs exprs = SqlInsert tbl (map toSqlColumn attrs) ((fmap . map) (sqlExpr gen) exprs) defaultSqlDelete :: SqlGenerator -> SqlTable -> [PrimExpr] -- ^ Criteria which must all be true for a row -- to be deleted. -> SqlDelete defaultSqlDelete gen tbl criteria = SqlDelete tbl (map (sqlExpr gen) criteria) defaultSqlExpr :: SqlGenerator -> PrimExpr -> SqlExpr defaultSqlExpr gen expr = case expr of AttrExpr (Symbol a t) -> ColumnSqlExpr (SqlColumn (tagWith t a)) BaseTableAttrExpr a -> ColumnSqlExpr (SqlColumn a) CompositeExpr e x -> CompositeSqlExpr (defaultSqlExpr gen e) x BinExpr op e1 e2 -> let leftE = sqlExpr gen e1 rightE = sqlExpr gen e2 paren = ParensSqlExpr (expL, expR) = case (op, e1, e2) of (OpAnd, BinExpr OpOr _ _, BinExpr OpOr _ _) -> (paren leftE, paren rightE) (OpOr, BinExpr OpAnd _ _, BinExpr OpAnd _ _) -> (paren leftE, paren rightE) (OpAnd, BinExpr OpOr _ _, _) -> (paren leftE, rightE) (OpAnd, _, BinExpr OpOr _ _) -> (leftE, paren rightE) (OpOr, BinExpr OpAnd _ _, _) -> (paren leftE, rightE) (OpOr, _, BinExpr OpAnd _ _) -> (leftE, paren rightE) (_, ConstExpr _, ConstExpr _) -> (leftE, rightE) (_, _, ConstExpr _) -> (paren leftE, rightE) (_, ConstExpr _, _) -> (leftE, paren rightE) _ -> (paren leftE, paren rightE) in BinSqlExpr (showBinOp op) expL expR UnExpr op e -> let (op',t) = sqlUnOp op e' = sqlExpr gen e in case t of UnOpFun -> FunSqlExpr op' [e'] UnOpPrefix -> PrefixSqlExpr op' (ParensSqlExpr e') UnOpPostfix -> PostfixSqlExpr op' e' -- TODO: The current arrangement whereby the delimeter parameter -- of string_agg is in the AggrStringAggr constructor, but the -- parameter being aggregated is not, seems unsatisfactory -- because it leads to a non-uniformity of treatment, as seen -- below. Perhaps we should have just `AggrExpr AggrOp` and -- always put the `PrimExpr` in the `AggrOp`. AggrExpr op e -> let op' = showAggrOp op e' = sqlExpr gen e moreAggrFunParams = case op of AggrStringAggr primE -> [sqlExpr gen primE] _ -> [] in AggrFunSqlExpr op' (e' : moreAggrFunParams) ConstExpr l -> ConstSqlExpr (sqlLiteral gen l) CaseExpr cs e -> let cs' = [(sqlExpr gen c, sqlExpr gen x)| (c,x) <- cs] e' = sqlExpr gen e in CaseSqlExpr cs' e' ListExpr es -> ListSqlExpr (map (sqlExpr gen) es) ParamExpr n _ -> ParamSqlExpr n PlaceHolderSqlExpr FunExpr n exprs -> FunSqlExpr n (map (sqlExpr gen) exprs) CastExpr typ e1 -> CastSqlExpr typ (sqlExpr gen e1) DefaultInsertExpr -> DefaultSqlExpr showBinOp :: BinOp -> String showBinOp OpEq = "=" showBinOp OpLt = "<" showBinOp OpLtEq = "<=" showBinOp OpGt = ">" showBinOp OpGtEq = ">=" showBinOp OpNotEq = "<>" showBinOp OpAnd = "AND" showBinOp OpOr = "OR" showBinOp OpLike = "LIKE" showBinOp OpIn = "IN" showBinOp (OpOther s) = s showBinOp OpCat = "||" showBinOp OpPlus = "+" showBinOp OpMinus = "-" showBinOp OpMul = "*" showBinOp OpDiv = "/" showBinOp OpMod = "MOD" showBinOp OpBitNot = "~" showBinOp OpBitAnd = "&" showBinOp OpBitOr = "|" showBinOp OpBitXor = "^" showBinOp OpAsg = "=" data UnOpType = UnOpFun | UnOpPrefix | UnOpPostfix sqlUnOp :: UnOp -> (String,UnOpType) sqlUnOp OpNot = ("NOT", UnOpPrefix) sqlUnOp OpIsNull = ("IS NULL", UnOpPostfix) sqlUnOp OpIsNotNull = ("IS NOT NULL", UnOpPostfix) sqlUnOp OpLength = ("LENGTH", UnOpFun) sqlUnOp OpAbs = ("@", UnOpFun) sqlUnOp OpNegate = ("-", UnOpFun) sqlUnOp OpLower = ("LOWER", UnOpFun) sqlUnOp OpUpper = ("UPPER", UnOpFun) sqlUnOp (UnOpOther s) = (s, UnOpFun) showAggrOp :: AggrOp -> String showAggrOp AggrCount = "COUNT" showAggrOp AggrSum = "SUM" showAggrOp AggrAvg = "AVG" showAggrOp AggrMin = "MIN" showAggrOp AggrMax = "MAX" showAggrOp AggrStdDev = "StdDev" showAggrOp AggrStdDevP = "StdDevP" showAggrOp AggrVar = "Var" showAggrOp AggrVarP = "VarP" showAggrOp AggrBoolAnd = "BOOL_AND" showAggrOp AggrBoolOr = "BOOL_OR" showAggrOp AggrArr = "ARRAY_AGG" showAggrOp (AggrStringAggr _) = "STRING_AGG" showAggrOp (AggrOther s) = s defaultSqlLiteral :: SqlGenerator -> Literal -> String defaultSqlLiteral _ l = case l of NullLit -> "NULL" DefaultLit -> "DEFAULT" BoolLit True -> "TRUE" BoolLit False -> "FALSE" ByteStringLit s -> binQuote s StringLit s -> quote s IntegerLit i -> show i DoubleLit d -> show d OtherLit o -> o defaultSqlQuote :: SqlGenerator -> String -> String defaultSqlQuote _ s = quote s -- | Quote a string and escape characters that need escaping -- We use Postgres "escape strings", i.e. strings prefixed -- with E, to ensure that escaping with backslash is valid. quote :: String -> String quote s = "E'" ++ concatMap escape s ++ "'" -- | Escape characters that need escaping escape :: Char -> String escape '\NUL' = "\\0" escape '\'' = "''" escape '"' = "\\\"" escape '\b' = "\\b" escape '\n' = "\\n" escape '\r' = "\\r" escape '\t' = "\\t" escape '\\' = "\\\\" escape c = [c] -- | Quote binary literals using Postgresql's hex format. binQuote :: ByteString -> String binQuote s = "E'\\\\x" ++ BS8.unpack (Base16.encode s) ++ "'"