Re: Newbie: Update trigger

"news.green.ch" <alessandro_at_franchini-net.com> wrote in message news:3dd89ad7$1_4_at_corp.newsgroups.com...
> Hi everyone
> my name is Alessandro and i'm new to this newsgroup.
>
> I have a simple problem. I would like in an update trigger to update a
> timestamp and moduser field to take trace of the changes to a row.
> But i having troubles because Oracle says the table is mutating.
> The trigger is defined like that:
> CREATE OR REPLACE TRIGGER FC_UTRICHIESTA_U_INFOS BEFORE UPDATE ON
> IASTEST.FC_UTRICHIESTA
> FOR EACH ROW
> BEGIN
> UPDATE FC_UTRICHIESTA SET MUTADATA = SYSDATE;
> END;
> /
>
> What i'm doing wrong or how can i solve my problem.
>
> Thanx in advance
>
> Alessandro Franchini
>
>
>
>
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Hi Allesandro,

You are trying to update the whole table (update without a predicate).

Try this:
CREATE OR REPLACE TRIGGER FC_UTRICHIESTA_U_INFOS BEFORE UPDATE ON IASTEST.FC_UTRICHIESTA
FOR EACH ROW
BEGIN
   select sysdate, user into :new.mutadata, :new.mutauser from dual; END;
/

This will operate on the row you are working with.

Regards,
Paul Received on Mon Nov 18 2002 - 14:16:12 CST