dblink_get_notify

Name

dblink_get_notify -- retrieve async notifications on a connection

Synopsis

dblink_get_notify() returns setof (notify_name text, be_pid int, extra text)
dblink_get_notify(text connname) returns setof (notify_name text, be_pid int, extra text)

Description

Note: XCONLY: The following description applies only to Postgres-XC.

dblink module has not been tested with Postges-XC yet. Although there're no reason that dblink does not run in Postgres-XC, the development team leaves the test and the use of this module entirely to users.

This section is identical to the corresponding PostgreSQL reference manual.

Note: The following description applies only to PostgreSQL

dblink_get_notify retrieves notifications on either the unnamed connection, or on a named connection if specified. To receive notifications via dblink, LISTEN must first be issued, using dblink_exec. For details see LISTEN and NOTIFY.

Arguments

Note: The following description applies only to PostgreSQL

conname

The name of a named connection to get notifications on.

Return Value

Note: The following description applies only to PostgreSQL

Returns setof (notify_name text, be_pid int, extra text), or an empty set if none.

Examples

Note: The following description applies only to PostgreSQL

SELECT dblink_exec('LISTEN virtual');
 dblink_exec 
-------------
 LISTEN
(1 row)

SELECT * FROM dblink_get_notify();
 notify_name | be_pid | extra
-------------+--------+-------
(0 rows)

NOTIFY virtual;
NOTIFY

SELECT * FROM dblink_get_notify();
 notify_name | be_pid | extra
-------------+--------+-------
 virtual     |   1229 |
(1 row)