Database.PostgreSQL.PQTypes.ToSQL

Documentation

type ParamAllocator = forall r. (Ptr PGparam -> IO r) -> IO r

alloca-like producer of PGparam objects.

class PQFormat t => ToSQL t where

Class which represents "from Haskell type to SQL (libpqtypes) type" transformation.

Associated Types

type PQDest t :: *

Destination type (used by libpqtypes).

Methods

toSQL

Arguments

:: t

Value to be put.

-> ParamAllocator

PGparam allocator.

-> (Ptr (PQDest t) -> IO r)

Continuation that puts converted value into inner PGparam.

-> IO r

Put supplied value into inner PGparam.

Instances

ToSQL Bool

ToSQL Char

ToSQL Double

ToSQL Float

ToSQL Int16

ToSQL Int32

ToSQL Int64

ToSQL Word8

ToSQL String

Encodes underlying C string as UTF-8, so if you are working with a different encoding, you should not rely on this instance.

ToSQL ByteString

ToSQL Text

Encodes underlying C string as UTF-8, so if you are working with a different encoding, you should not rely on this instance.

ToSQL LocalTime

ToSQL ZonedTime

ToSQL TimeOfDay

ToSQL UTCTime

ToSQL Day

ToSQL Interval

ToSQL XML

ToSQL t => ToSQL (Maybe t)

CompositeToSQL t => ToSQL (Composite t)

ToSQL (Binary ByteString)

CompositeToSQL t => ToSQL (CompositeArray2 t)

ToSQL t => ToSQL (Array2 t)

CompositeToSQL t => ToSQL (CompositeArray1 t)

ToSQL t => ToSQL (Array1 t)

put :: Storable t => t -> (Ptr t -> IO r) -> IO r

Function that abstracts away common elements of most ToSQL instance definitions to make them easier to write and less verbose.