Safe Haskell	None
Language	Haskell2010

Database.PostgreSQL.PQTypes.FromSQL

Synopsis

class (PQFormat t, Storable (PQBase t)) => FromSQL t where
- type PQBase t :: *
- fromSQL :: Maybe (PQBase t) -> IO t

Documentation

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

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

Associated Types

type PQBase t :: * Source #

Base type (used by libpqtypes).

Methods

fromSQL Source #

Arguments

:: Maybe (PQBase t)	base value (Nothing if NULL was delivered)
-> IO t

Convert value of base type to target one.

Instances

FromSQL Bool Source #
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase Bool :: Type Source # Methods fromSQL :: Maybe (PQBase Bool) -> IO Bool Source #
FromSQL Char Source #
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase Char :: Type Source # Methods fromSQL :: Maybe (PQBase Char) -> IO Char Source #
FromSQL Double Source #
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase Double :: Type Source # Methods fromSQL :: Maybe (PQBase Double) -> IO Double Source #
FromSQL Float Source #
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase Float :: Type Source # Methods fromSQL :: Maybe (PQBase Float) -> IO Float Source #
FromSQL Int16 Source #
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase Int16 :: Type Source # Methods fromSQL :: Maybe (PQBase Int16) -> IO Int16 Source #
FromSQL Int32 Source #
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase Int32 :: Type Source # Methods fromSQL :: Maybe (PQBase Int32) -> IO Int32 Source #
FromSQL Int64 Source #
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase Int64 :: Type Source # Methods fromSQL :: Maybe (PQBase Int64) -> IO Int64 Source #
FromSQL Word8 Source #
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase Word8 :: Type Source # Methods fromSQL :: Maybe (PQBase Word8) -> IO Word8 Source #
FromSQL ByteString Source #
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase ByteString :: Type Source # Methods fromSQL :: Maybe (PQBase ByteString) -> IO ByteString Source #
FromSQL ByteString Source #
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase ByteString :: Type Source # Methods fromSQL :: Maybe (PQBase ByteString) -> IO ByteString Source #
FromSQL Text Source #	Assumes that source C string is UTF-8, so if you are working with a different encoding, you should not rely on this instance.
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase Text :: Type Source # Methods fromSQL :: Maybe (PQBase Text) -> IO Text Source #
FromSQL UTCTime Source #	`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.
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase UTCTime :: Type Source # Methods fromSQL :: Maybe (PQBase UTCTime) -> IO UTCTime Source #
FromSQL Text Source #	Assumes that source C string is UTF-8, so if you are working with a different encoding, you should not rely on this instance
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase Text :: Type Source # Methods fromSQL :: Maybe (PQBase Text) -> IO Text Source #
FromSQL String Source #	Assumes that source C string is UTF-8, so if you are working with a different encoding, you should not rely on this instance.
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase String :: Type Source # Methods fromSQL :: Maybe (PQBase String) -> IO String Source #
FromSQL LocalTime Source #
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase LocalTime :: Type Source # Methods fromSQL :: Maybe (PQBase LocalTime) -> IO LocalTime Source #
FromSQL TimeOfDay Source #
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase TimeOfDay :: Type Source # Methods fromSQL :: Maybe (PQBase TimeOfDay) -> IO TimeOfDay Source #
FromSQL Day Source #
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase Day :: Type Source # Methods fromSQL :: Maybe (PQBase Day) -> IO Day Source #
FromSQL Interval Source #
Instance details Defined in Database.PostgreSQL.PQTypes.Interval Associated Types type PQBase Interval :: Type Source # Methods fromSQL :: Maybe (PQBase Interval) -> IO Interval Source #
FromSQL XML Source #
Instance details Defined in Database.PostgreSQL.PQTypes.XML Associated Types type PQBase XML :: Type Source # Methods fromSQL :: Maybe (PQBase XML) -> IO XML Source #
FromSQL t => FromSQL (Maybe t) Source #
Instance details Defined in Database.PostgreSQL.PQTypes.FromSQL Associated Types type PQBase (Maybe t) :: Type Source # Methods fromSQL :: Maybe (PQBase (Maybe t)) -> IO (Maybe t) Source #
FromSQL (JSONB ByteString) Source #
Instance details Defined in Database.PostgreSQL.PQTypes.JSON Associated Types type PQBase (JSONB ByteString) :: Type Source # Methods fromSQL :: Maybe (PQBase (JSONB ByteString)) -> IO (JSONB ByteString) Source #
FromSQL (JSONB ByteString) Source #
Instance details Defined in Database.PostgreSQL.PQTypes.JSON Associated Types type PQBase (JSONB ByteString) :: Type Source # Methods fromSQL :: Maybe (PQBase (JSONB ByteString)) -> IO (JSONB ByteString) Source #
FromSQL (JSONB Value) Source #
Instance details Defined in Database.PostgreSQL.PQTypes.JSON Associated Types type PQBase (JSONB Value) :: Type Source # Methods fromSQL :: Maybe (PQBase (JSONB Value)) -> IO (JSONB Value) Source #
FromSQL (JSON ByteString) Source #
Instance details Defined in Database.PostgreSQL.PQTypes.JSON Associated Types type PQBase (JSON ByteString) :: Type Source # Methods fromSQL :: Maybe (PQBase (JSON ByteString)) -> IO (JSON ByteString) Source #
FromSQL (JSON ByteString) Source #
Instance details Defined in Database.PostgreSQL.PQTypes.JSON Associated Types type PQBase (JSON ByteString) :: Type Source # Methods fromSQL :: Maybe (PQBase (JSON ByteString)) -> IO (JSON ByteString) Source #
FromSQL (JSON Value) Source #
Instance details Defined in Database.PostgreSQL.PQTypes.JSON Associated Types type PQBase (JSON Value) :: Type Source # Methods fromSQL :: Maybe (PQBase (JSON Value)) -> IO (JSON Value) Source #
CompositeFromSQL t => FromSQL (Composite t) Source #
Instance details Defined in Database.PostgreSQL.PQTypes.Composite Associated Types type PQBase (Composite t) :: Type Source # Methods fromSQL :: Maybe (PQBase (Composite t)) -> IO (Composite t) Source #
CompositeFromSQL t => FromSQL (CompositeArray2 t) Source #
Instance details Defined in Database.PostgreSQL.PQTypes.Array Associated Types type PQBase (CompositeArray2 t) :: Type Source # Methods fromSQL :: Maybe (PQBase (CompositeArray2 t)) -> IO (CompositeArray2 t) Source #
FromSQL t => FromSQL (Array2 t) Source #
Instance details Defined in Database.PostgreSQL.PQTypes.Array Associated Types type PQBase (Array2 t) :: Type Source # Methods fromSQL :: Maybe (PQBase (Array2 t)) -> IO (Array2 t) Source #
CompositeFromSQL t => FromSQL (CompositeArray1 t) Source #
Instance details Defined in Database.PostgreSQL.PQTypes.Array Associated Types type PQBase (CompositeArray1 t) :: Type Source # Methods fromSQL :: Maybe (PQBase (CompositeArray1 t)) -> IO (CompositeArray1 t) Source #
FromSQL t => FromSQL (Array1 t) Source #
Instance details Defined in Database.PostgreSQL.PQTypes.Array Associated Types type PQBase (Array1 t) :: Type Source # Methods fromSQL :: Maybe (PQBase (Array1 t)) -> IO (Array1 t) Source #