> On Fri, 22 Aug 2003, Stuart wrote:
>
> > Folks,
> >
> > I was wandering if there was a feasible way to automatically update a field
> > in a table, say 'revision_date' in a record whenever any other field in the
> > record is changed. My attempts to use a trigger caused repeating loops and
> > bombed with error. I would like to be able to update such a field
> > automatically anytime a record was updated. Any help would be appreciated.
Unless I'm misunderstanding you, this is really easy. Here's what
I use in nearly every database I build:
create or replace function timestamp_fn() returns opaque as ' begin NEW.moddate = now(); return NEW;
end
' language 'plpgsql';
create table blah (
... createdate timestamp default now(), moddate timestamp,
create trigger blah_timestamp_tr before insert or update on blah for each row execute procedure timestamp_fn();
Make the obvious changes for only doing this on updates.
Or am I misunderstanding your goal?
-j
--
Jamie Lawrence jal@jal.org
"One of the great things about books is that sometimes there
are some fantastic pictures." - George H. W. Bush
