Message-ID: <20030613135010.71562.qmail@web20805.mail.yahoo.com>
Date: Fri, 13 Jun 2003 06:50:10 -0700 (PDT)
From: Jeff Eckermann <jeff_eckermann@yahoo.com>
Subject: Re: trigger : emulate "instead of" with before ?
To: Albrecht Berger <berger1517@gmx.ch>,
	pgsql <pgsql-sql@postgresql.org>
In-Reply-To: <046801c331a2$0c483e70$a07ba8c0@wxp>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii

I believe that if you return NULL from the trigger
function, the delete will not actually be done.  You
could set the value of the delete flag by reference to
OLD.fieldname.

I have not actually done this myself, so caveat
emptor.

--- Albrecht Berger <berger1517@gmx.ch> wrote:
> Hello,
> I need a trigger which is updating a delete flag of
> a row instead of
> deleting it physically.
> 
> How do I implement a trigger which doesn't execute a
> delete without raising
> an exception
> in plsql ?
> 
> CREATE TRIGGER trigger1 BEFORE DELETE ON table1
> FOR EACH ROW EXECUTE PROCEDURE setDeleteFlag ();
> 
> If I use
> RAISE EXCEPTION "..."
> the delete statement isn't executed, but I think the
> transaction is rolled
> back too, am I right ?
> 
> So what is the best way to implement something
> (Oracle like) like that :
> CREATE TRIGGER trigger1 INSTEAD OF DELETE ON table1
> FOR EACH ROW EXECUTE PROCEDURE setDeleteFlag ();
> 
> thx
> 
> 
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