Re: Auto-updated fields - Mailing list pgsql-hackers

From Robert Treat
Subject Re: Auto-updated fields
Date
Msg-id 200805081120.08329.xzilla@users.sourceforge.net
Whole thread Raw
In response to Re: Auto-updated fields  (Tino Wildenhain <tino@wildenhain.de>)
Responses Re: Auto-updated fields
List pgsql-hackers
On Thursday 08 May 2008 00:27:10 Tino Wildenhain wrote:
> David Fetter wrote:
> > Folks,
> >
> > A co-worker pointed out to me that MySQL has a feature that, properly
> > implemented and maybe extended, could be handy, namely what MySQL
> > calls a "timestamp" field, so here's a proposal:
> >
> > 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().
> >
> > 2.  Have some kind of pre-processing of CREATE and ALTER statements on
> > tables which would attach the above function to the field at hand,
> > something like:
> >
> > CREATE TABLE foo(
> >     last_updated TIMESTAMPTZ_UPDATED(),
> >     ...
> > );
> >
> > which would turn last_updated into a TIMESTAMPTZ with the expected
> > behavior on UPDATEs.
> >
> > What do folks think of this idea?
>
> 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 guess this is commonly used with timestamp fields so why not
> include a receipe to the docs under examples for timestamp which
> shows how to create and use a trigger?
>

I have a generic version of this in pagila. 

-- 
Robert Treat
Build A Brighter LAMP :: Linux Apache {middleware} PostgreSQL


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