dblink_get_notify
dblink_get_notify
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
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
-
connname -
The name of a named connection to get notifications on.
Return Value
Returns
setof (notify_name text, be_pid int, extra text)
, or an empty set if none.
Examples
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)