Database.PostgreSQL.Typed.SQLToken

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

Documentation

data SQLToken

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

Eq SQLToken

Methods

(==) :: SQLToken -> SQLToken -> Bool

(/=) :: SQLToken -> SQLToken -> Bool

Show SQLToken

Produces the original SQL string

Methods

showsPrec :: Int -> SQLToken -> ShowS

show :: SQLToken -> String

showList :: [SQLToken] -> ShowS

IsString SQLToken

Methods

fromString :: String -> SQLToken

sqlTokens :: String -> [SQLToken]

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