Re: triggers and NOTIFY

Steven Bradley <sbradley(at)llnl(dot)gov> writes:
> When the trigger simply
> issues the NOTIFY, the front-end process recieves the notification just
> fine. However, when I also try to INSERT a record into table B from within
> the trigger (either before or after issuing the NOTIFY), the record gets
> inserted into table B, but the front-end application does not recieve a
> notification.

What version are you using? The test case you gave causes a repeatable
core dump in 6.5 for me, so it was pretty easy to find the cause.
I have committed a fix for 6.5.1, but if you are in a hurry:

*** pl/plpgsql/src/pl_exec.c.orig Tue May 25 12:15:17 1999
--- pl/plpgsql/src/pl_exec.c Sat Jul 3 21:03:01 1999
***************
*** 2486,2491 ****
--- 2486,2494 ----
* 2. It must be a RESULT plan --> no scan's required
* ----------
*/
+ if (plan == NULL) /* utility statement produces this */
+ return;
+
if (nodeTag(plan) != T_Result)
return;

This might be the same problem that someone (Vince, maybe?) was
complaining about a couple months ago --- I didn't look into it
at the time.

regards, tom lane