Re: Preventing Deletions with triggers

O kyrios Jeff Post egrapse stis May 19, 2004 :

> I would like to have a trigger that fires whenever a delete is attempted.
> The trigger should update the status field of the tupple (to remove the
> tupple form the active set of tupples).
>

A rule would be more appropriate for this task.

>
> Here is what I got:
>
> CREATE or replace FUNCTION person_fake_delete() RETURNS TRIGGER AS '
> BEGIN
> OLD.status := 1; -- This does the fake deletion
> RETURN NULL; -- I thought this would prevent the delete from
> actually happening.
> END;
> ' LANGUAGE 'plpgsql';
>
> create trigger person_fake_delete
> before delete on person
> for each row EXECUTE PROCEDURE
> person_fake_delete();
>
> This however does not work. the tupple is still deleted from the
> table. Any Ideas?
>
> Thanks,
> Jeff Post
>
>
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--
-Achilleus