PostgreSQL 9.3.4 文档
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UNLISTEN

Name

UNLISTEN -- stop listening for a notification

Synopsis

UNLISTEN { channel | * }

描述

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 channel named channel. The special wildcard * cancels all listener registrations for the current session.

NOTIFY contains a more extensive discussion of the use of LISTEN and NOTIFY.

参数

channel

Name of a notification channel (any identifier).

*

All current listen registrations for this session are cleared.

注解

You can unlisten something you were not listening for; no warning or error will appear.

At the end of each session, UNLISTEN * is automatically executed.

A transaction that has executed UNLISTEN cannot be prepared for two-phase commit.

例子

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 messages will be ignored: 

UNLISTEN virtual;
NOTIFY virtual;
-- no NOTIFY event is received

兼容性

There is no UNLISTEN command in the SQL standard.

参见

LISTEN, NOTIFY
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