Message-ID: <434DC97E.7000603@globaldial.com>
Date: Thu, 13 Oct 2005 10:42:06 +0800
From: Jeff Williams <jeffw@globaldial.com>
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To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-sql@postgresql.org
Subject: Re: Update timestamp on update
References: <434DB482.1000205@globaldial.com> <16305.1129167889@sss.pgh.pa.us>
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Tom Lane wrote:

>Jeff Williams <jeffw@globaldial.com> writes:
>  
>
>>    last_status_change timestamp DEFAULT now()
>>    
>>
>
>  
>
>>What I would like is that whenever the status is changed the
>>last_status_change timestamp is updated to the current time.
>>    
>>
>
>For this you use an ON UPDATE trigger; rules are not a good way to solve
>it.  See the documentation about triggers.  The first example on this
>page does it along with a few other things:
>http://developer.postgresql.org/docs/postgres/plpgsql-trigger.html
>  
>
Thanks. Triggers was my first thought, but chapter 35 on Triggers didn't
really indicate a way I could do this easily and scared me with a lot of
c code. Maybe it is a good idea to present some of the more common
things you would want to do with triggers in the triggers chapter?

Jeff