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Implement dblink_get_notify().

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Adds the ability to retrieve async notifications using dblink,
via the addition of the function dblink_get_notify(). Original patch
by Marcus Kempe, suggestions by Tom Lane and Alvaro Herrera, patch
review and adjustments by Joe Conway.
This commit is contained in:
Joe Conway
2009-08-05 16:11:07 +00:00
parent 16f3cf8c0c
commit f4095b4c4b
7 changed files with 253 additions and 5 deletions
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51
contrib/dblink/expected/dblink.out
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@ -827,3 +827,54 @@ DROP USER dblink_regression_test;
DROP USER MAPPING FOR public SERVER fdtest;
DROP SERVER fdtest;
DROP FOREIGN DATA WRAPPER postgresql;
-- test asynchronous notifications
SELECT dblink_connect('dbname=contrib_regression');
dblink_connect
----------------
OK
(1 row)
--should return listen
SELECT dblink_exec('LISTEN regression');
dblink_exec
-------------
LISTEN
(1 row)
--should return listen
SELECT dblink_exec('LISTEN foobar');
dblink_exec
-------------
LISTEN
(1 row)
SELECT dblink_exec('NOTIFY regression');
dblink_exec
-------------
NOTIFY
(1 row)
SELECT dblink_exec('NOTIFY foobar');
dblink_exec
-------------
NOTIFY
(1 row)
SELECT notify_name, be_pid = (select t.be_pid from dblink('select pg_backend_pid()') as t(be_pid int)) AS is_self_notify, extra from dblink_get_notify();
notify_name | is_self_notify | extra
-------------+----------------+-------
regression | t |
foobar | t |
(2 rows)
SELECT * from dblink_get_notify();
notify_name | be_pid | extra
-------------+--------+-------
(0 rows)
SELECT dblink_disconnect();
dblink_disconnect
-------------------
OK
(1 row)