Jean-Francois Leveque wrote:
>
> I want to check something before
> a delete is made.
>
> I made a before delete trigger that
> calls a procedure.
>
> The procedure raises an exception
> when I don't want the delete to be
> made (I could also have returned NULL,
> but wouldn't have get much information
> from it).
>
>
> The question is :
> What do I return when I want the delete to be made ?
>
> If I return OLD (known when deleting), maybe that
> cancels the delete too.
>
> I don't have NEW (known only on insert/update).
>
> I couldn't find the answer in the docs.
Returning OLD from a BEFORE ROW trigger let's the delete happen - no "maybe" here. On AFTER ROW triggers it
doesn't matter what you return, the delete happened already (well, RAISE EXCEPTION will rollback of course).
Jan
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