Обсуждение: Trigger Procedures question

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.


Best regards,

Jean-Francois Leveque


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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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