Re: Auto-updated fields

On Wednesday 21 January 2009 20:21:41 Bruce Momjian wrote:
> Alvaro Herrera wrote:
> > Robert Treat wrote:
> > > On Thursday 08 May 2008 00:27:10 Tino Wildenhain wrote:
> > > > David Fetter wrote:
> >
> > Ref: http://archives.postgresql.org/pgsql-hackers/2008-05/msg00198.php
> >
> > > > > 1. Create a generic (possibly overloaded) trigger function,
> > > > > bundled with PostgreSQL, which sets a field to some value. For
> > > > > example, a timestamptz version might set the field to now().
> > > >
> > > > Having the pre defined triggers at hand could be useful, especially
> > > > for people not writing triggers so often to get used to it but I'm
> > > > really not happy with the idea of magic preprocessing.
> > >
> > > I have a generic version of this in pagila.
> >
> > Now that we have a specific file in core for generic triggers (right now
> > with a single one), how about adding this one to it?
>
> Any progress on this? TODO?

I think this is a TODO, but not sure who is working on it or what needs to be
done. The generic version in pagila is perhaps not generic enough:

CREATE FUNCTION last_updated() RETURNS trigger
AS $$
BEGIN
NEW.last_update = CURRENT_TIMESTAMP;
RETURN NEW;
END $$
LANGUAGE plpgsql;

It requires you name your column last_update, which is what the naming
convention is in pagila, but might not work for everyone. Can someone work
with that and move forward? Or maybe give a more specific pointer to the
generic trigger stuff (I've not looked at it before)

--
Robert Treat
Conjecture: http://www.xzilla.net
Consulting: http://www.omniti.com