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UNLISTEN(l) SQL - Language Statements (2002-11-22) UNLISTEN(l)
NAME
UNLISTEN - stop listening for a notification
SYNOPSIS
UNLISTEN { notifyname | * }
INPUTS
notifyname
Name of previously registered notify condition.
* All current listen registrations for this backend are
cleared.
OUTPUTS
UNLISTEN
Acknowledgment that statement has executed.
DESCRIPTION
UNLISTEN is used to remove an existing NOTIFY registration.
UNLISTEN cancels any existing registration of the current
PostgreSQL session as a listener on the notify condition
notifyname. The special condition wildcard * cancels all
listener registrations for the current session.
NOTIFY [notify(l)] contains a more extensive discussion of
the use of LISTEN and NOTIFY.
NOTES
notifyname need not be a valid class name but can be any
string valid as a name up to 64 characters long.
The backend does not complain if you unlisten something you
were not listening for. Each backend will automatically
execute UNLISTEN * when exiting.
USAGE
To subscribe to an existing registration:
LISTEN virtual;
LISTEN
NOTIFY virtual;
NOTIFY
Asynchronous NOTIFY 'virtual' from backend with pid '8448' received
Once UNLISTEN has been executed, further NOTIFY commands
will be ignored:
UNLISTEN virtual;
UNLISTEN
Page 1 (printed 3/24/03)
UNLISTEN(l) SQL - Language Statements (2002-11-22) UNLISTEN(l)
NOTIFY virtual;
NOTIFY
-- notice no NOTIFY event is received
COMPATIBILITY
SQL92
There is no UNLISTEN in SQL92.
Page 2 (printed 3/24/03)
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