Database.PostgreSQL.PQTypes.FromSQL

Documentation

class (PQFormat t, Storable (PQBase t)) => FromSQL t where

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

Minimal complete definition

fromSQL

Associated Types

type PQBase t :: *

Base type (used by libpqtypes).

Methods

fromSQL :: Maybe (PQBase t) -> IO t

Convert value of base type to target one.

Instances

FromSQL Bool

Associated Types

type PQBase Bool :: *

Methods

fromSQL :: Maybe (PQBase Bool) -> IO Bool

FromSQL Char

Associated Types

type PQBase Char :: *

Methods

fromSQL :: Maybe (PQBase Char) -> IO Char

FromSQL Double

Associated Types

type PQBase Double :: *

Methods

fromSQL :: Maybe (PQBase Double) -> IO Double

FromSQL Float

Associated Types

type PQBase Float :: *

Methods

fromSQL :: Maybe (PQBase Float) -> IO Float

FromSQL Int16

Associated Types

type PQBase Int16 :: *

Methods

fromSQL :: Maybe (PQBase Int16) -> IO Int16

FromSQL Int32

Associated Types

type PQBase Int32 :: *

Methods

fromSQL :: Maybe (PQBase Int32) -> IO Int32

FromSQL Int64

Associated Types

type PQBase Int64 :: *

Methods

fromSQL :: Maybe (PQBase Int64) -> IO Int64

FromSQL Word8

Associated Types

type PQBase Word8 :: *

Methods

fromSQL :: Maybe (PQBase Word8) -> IO Word8

FromSQL ByteString

Associated Types

type PQBase ByteString :: *

Methods

fromSQL :: Maybe (PQBase ByteString) -> IO ByteString

FromSQL ByteString

Associated Types

type PQBase ByteString :: *

Methods

fromSQL :: Maybe (PQBase ByteString) -> IO ByteString

FromSQL String

Assumes that source C string is UTF-8, so if you are working with a different encoding, you should not rely on this instance.

Associated Types

type PQBase String :: *

Methods

fromSQL :: Maybe (PQBase String) -> IO String

FromSQL Text

Assumes that source C string is UTF-8, so if you are working with a different encoding, you should not rely on this instance.

Associated Types

type PQBase Text :: *

Methods

fromSQL :: Maybe (PQBase Text) -> IO Text

FromSQL UTCTime

FromSQL instance for ZonedTime doesn't exist because PostgreSQL doesn't provide zone offset information when returning timestamps with time zone in a binary format.

Associated Types

type PQBase UTCTime :: *

Methods

fromSQL :: Maybe (PQBase UTCTime) -> IO UTCTime

FromSQL Text

Assumes that source C string is UTF-8, so if you are working with a different encoding, you should not rely on this instance

Associated Types

type PQBase Text :: *

Methods

fromSQL :: Maybe (PQBase Text) -> IO Text

FromSQL LocalTime

Associated Types

type PQBase LocalTime :: *

Methods

fromSQL :: Maybe (PQBase LocalTime) -> IO LocalTime

FromSQL TimeOfDay

Associated Types

type PQBase TimeOfDay :: *

Methods

fromSQL :: Maybe (PQBase TimeOfDay) -> IO TimeOfDay

FromSQL Day

Associated Types

type PQBase Day :: *

Methods

fromSQL :: Maybe (PQBase Day) -> IO Day

FromSQL Interval

Associated Types

type PQBase Interval :: *

Methods

fromSQL :: Maybe (PQBase Interval) -> IO Interval

FromSQL XML

Associated Types

type PQBase XML :: *

Methods

fromSQL :: Maybe (PQBase XML) -> IO XML

FromSQL t => FromSQL (Maybe t)

Associated Types

type PQBase (Maybe t) :: *

Methods

fromSQL :: Maybe (PQBase (Maybe t)) -> IO (Maybe t)

FromSQL (JSONB ByteString)

Associated Types

type PQBase (JSONB ByteString) :: *

Methods

fromSQL :: Maybe (PQBase (JSONB ByteString)) -> IO (JSONB ByteString)

FromSQL (JSONB ByteString)

Associated Types

type PQBase (JSONB ByteString) :: *

Methods

fromSQL :: Maybe (PQBase (JSONB ByteString)) -> IO (JSONB ByteString)

FromSQL (JSONB Value)

Associated Types

type PQBase (JSONB Value) :: *

Methods

fromSQL :: Maybe (PQBase (JSONB Value)) -> IO (JSONB Value)

FromSQL (JSON ByteString)

Associated Types

type PQBase (JSON ByteString) :: *

Methods

fromSQL :: Maybe (PQBase (JSON ByteString)) -> IO (JSON ByteString)

FromSQL (JSON ByteString)

Associated Types

type PQBase (JSON ByteString) :: *

Methods

fromSQL :: Maybe (PQBase (JSON ByteString)) -> IO (JSON ByteString)

FromSQL (JSON Value)

Associated Types

type PQBase (JSON Value) :: *

Methods

fromSQL :: Maybe (PQBase (JSON Value)) -> IO (JSON Value)

CompositeFromSQL t => FromSQL (Composite t)

Associated Types

type PQBase (Composite t) :: *

Methods

fromSQL :: Maybe (PQBase (Composite t)) -> IO (Composite t)

CompositeFromSQL t => FromSQL (CompositeArray2 t)

Associated Types

type PQBase (CompositeArray2 t) :: *

Methods

fromSQL :: Maybe (PQBase (CompositeArray2 t)) -> IO (CompositeArray2 t)

FromSQL t => FromSQL (Array2 t)

Associated Types

type PQBase (Array2 t) :: *

Methods

fromSQL :: Maybe (PQBase (Array2 t)) -> IO (Array2 t)

CompositeFromSQL t => FromSQL (CompositeArray1 t)

Associated Types

type PQBase (CompositeArray1 t) :: *

Methods

fromSQL :: Maybe (PQBase (CompositeArray1 t)) -> IO (CompositeArray1 t)

FromSQL t => FromSQL (Array1 t)

Associated Types

type PQBase (Array1 t) :: *

Methods

fromSQL :: Maybe (PQBase (Array1 t)) -> IO (Array1 t)