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From: Jeff Williams <[email protected]>
To: Tom Lane <[email protected]>
Cc: [email protected]
Subject: Re: Update timestamp on update
Date: Thu, 13 Oct 2005 10:42:06 +0800
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>

Tom Lane wrote:

>Jeff Williams <[email protected]> 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

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