|PostgreSQL 8.2.23 Documentation|
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UNLISTEN is used to remove an existing registration for NOTIFY events. UNLISTEN cancels any existing registration of the current PostgreSQL session as a listener on the notification name. The special wildcard * cancels all listener registrations for the current session.
NOTIFY contains a more extensive discussion of the use of LISTEN and NOTIFY.
Name of a notification (any identifier).
All current listen registrations for this session are cleared.
You may unlisten something you were not listening for; no warning or error will appear.
At the end of each session, UNLISTEN * is automatically executed.
To make a registration:
LISTEN virtual; NOTIFY virtual; Asynchronous notification "virtual" received from server process with PID 8448.
Once UNLISTEN has been executed, further NOTIFY commands will be ignored:
UNLISTEN virtual; NOTIFY virtual; -- no NOTIFY event is received