Safe Haskell	Safe
Language	Haskell2010

DeleteParser

Description

Synopsis

data DeleteExpr = Delete {
- dTname :: ValueExpr
- dWhere :: ValueExpr
}
deleteExpr :: Parser DeleteExpr
makeDelete :: DeleteExpr
evaluateDelete :: Either ParseError DeleteExpr -> Maybe Database -> Maybe Database

Documentation

data DeleteExpr Source #

DeleteExpr is a constructor type for Delete Queries.

Constructors

Delete
Fields dTname :: ValueExpr `iTname` is name of the table dWhere :: ValueExpr `iWhere` contains where clause expression

Instances

Eq DeleteExpr Source #
Instance details Defined in DeleteParser Methods (==) :: DeleteExpr -> DeleteExpr -> Bool # (/=) :: DeleteExpr -> DeleteExpr -> Bool #
Show DeleteExpr Source #
Instance details Defined in DeleteParser Methods showsPrec :: Int -> DeleteExpr -> ShowS # show :: DeleteExpr -> String # showList :: [DeleteExpr] -> ShowS #

deleteExpr :: Parser DeleteExpr Source #

deleteExpr' aggerates all parsers to parse CREATE query

makeDelete :: DeleteExpr Source #

makeDelete creates empty DeleteExpr object

evaluateDelete :: Either ParseError DeleteExpr -> Maybe Database -> Maybe Database Source #

evaluateDelete evaluates parsed DeleteExpr to delete rows in database table First argument is parsed DeleteExpr Second argument is databse instance