Database.PostgreSQL.Simple.Notification

Support for receiving asynchronous notifications via PostgreSQL's Listen/Notify mechanism. See http://www.postgresql.org/docs/9.1/static/sql-notify.html for more information.

Documentation

data Notification

Constructors

Notification

Fields

notificationPid :: !CPid

notificationChannel :: !ByteString

notificationData :: !ByteString

getNotification :: Connection -> IO Notification

Returns a single notification. If no notifications are available, getNotification blocks until one arrives.

getNotificationNonBlocking :: Connection -> IO (Maybe Notification)

Non-blocking variant of getNotification. Returns a single notification, if available. If no notifications are available, returns Nothing.