Database.PostgreSQL.PQTypes.Notification

Documentation

newtype Channel

Representation of notification channel.

Constructors

Channel (RawSQL ())

Instances

Eq Channel

Methods

(==) :: Channel -> Channel -> Bool

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

Ord Channel

Methods

compare :: Channel -> Channel -> Ordering

(<) :: Channel -> Channel -> Bool

(<=) :: Channel -> Channel -> Bool

(>) :: Channel -> Channel -> Bool

(>=) :: Channel -> Channel -> Bool

max :: Channel -> Channel -> Channel

min :: Channel -> Channel -> Channel

Show Channel

Methods

showsPrec :: Int -> Channel -> ShowS

show :: Channel -> String

showList :: [Channel] -> ShowS

IsString Channel

Methods

fromString :: String -> Channel

data Notification

Representation of a notification sent by PostgreSQL.

Constructors

Notification

Fields

• ntPID :: !CPid

  Process ID of notifying server.

• ntChannel :: !Channel

  Notification channel name.

• ntPayload :: !Text

  Notification payload string.

Instances

Eq Notification

Methods

(==) :: Notification -> Notification -> Bool

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

Ord Notification

Methods

compare :: Notification -> Notification -> Ordering

(<) :: Notification -> Notification -> Bool

(<=) :: Notification -> Notification -> Bool

(>) :: Notification -> Notification -> Bool

(>=) :: Notification -> Notification -> Bool

max :: Notification -> Notification -> Notification

min :: Notification -> Notification -> Notification

Show Notification

Methods

showsPrec :: Int -> Notification -> ShowS

show :: Notification -> String

showList :: [Notification] -> ShowS

Storable Notification

Methods

sizeOf :: Notification -> Int

alignment :: Notification -> Int

peekElemOff :: Ptr Notification -> Int -> IO Notification

pokeElemOff :: Ptr Notification -> Int -> Notification -> IO ()

peekByteOff :: Ptr b -> Int -> IO Notification

pokeByteOff :: Ptr b -> Int -> Notification -> IO ()

peek :: Ptr Notification -> IO Notification

poke :: Ptr Notification -> Notification -> IO ()

listen :: MonadDB m => Channel -> m ()

Start listening for notifications on a given channel.

unlisten :: MonadDB m => Channel -> m ()

Stop listening for notifications on a given channel.

unlistenAll :: MonadDB m => m ()

Cancel all listener registrations for the current session.

notify :: MonadDB m => Channel -> Text -> m ()

Generate a notification on a given channel.