Database.PostgreSQL.Typed.SQLToken

Description

Parsing of SQL statements to safely identify placeholders. Supports both dollar-placeholders and question marks for HDBC.

Synopsis

Documentation

A parsed SQL token.

Constructors

SQLToken String	Raw (non-markup) SQL string
SQLParam Int	A "$N" parameter placeholder (this is the only non-string-preserving token: "$012" becomes "$12")
SQLExpr String	A "${expr}" expression placeholder
SQLQMark Bool	A possibly-escaped question-mark: False for "?" or True for "\?"

Instances details

IsString SQLToken Source #
Instance details Defined in Database.PostgreSQL.Typed.SQLToken Methods fromString :: String -> SQLToken #
Show SQLToken Source #	Produces the original SQL string
Instance details Defined in Database.PostgreSQL.Typed.SQLToken Methods showsPrec :: Int -> SQLToken -> ShowS # show :: SQLToken -> String # showList :: [SQLToken] -> ShowS #
Eq SQLToken Source #
Instance details Defined in Database.PostgreSQL.Typed.SQLToken Methods (==) :: SQLToken -> SQLToken -> Bool # (/=) :: SQLToken -> SQLToken -> Bool #

Parse a SQL string into a series of tokens. The showList implementation for SQLToken inverts this sequence back to a SQL string.