Re: triggers and FK cascades

There's a generic trigger that sends a signal to a process whenever
changes are made (via listen/notify mechanism), but when FK cascade
fires it will cause a mass amount of notifies to be send out and I
want to avoid it.


2011/3/18 David Johnston <polobo@yahoo.com>:
> Don't know if this would work but could you check to see if the corresponding PK exists on A?
>
> It may also help to explain why you would want to do such a thing so that someone may be able to provide an
alternativesolution as opposed to simply responding to a generic feature question. 
>
> David J.
>
> -----Original Message-----
> From: pgsql-general-owner@postgresql.org [mailto:pgsql-general-owner@postgresql.org] On Behalf Of Grzegorz Jaskiewicz
> Sent: Thursday, March 17, 2011 6:41 PM
> To: pgsql-general@postgresql.org
> Subject: [GENERAL] triggers and FK cascades
>
> Considering the following example.
> Tables A and B.
> Table A contains some data.
> Table B reefers to table A using FK with 'on delete cascade'. Table B has a trigger on it, after delete per row
>
> Now, is there any way I can tell in the trigger on table B that it has been called from a direct delete on that
table,as oppose to the indirect (FK) delete on table A? 
>
> Trigger is PLpg/SQL or C function.
>
>
> --
> GJ
>
> --
> Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-general
>
>



--
GJ