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Re: Triggers and Functions

From: Tom Allison <tom(at)tacocat(dot)net>
To: pgsql-novice(at)postgresql(dot)org
Subject: Re: Triggers and Functions
Date: 2006-11-24 16:42:34
Message-ID: 456720FA.8070300@tacocat.net (view raw or flat)
Thread:
Lists: pgsql-novice
A. Kretschmer wrote:
> am  Fri, dem 24.11.2006, um  7:25:16 -0500 mailte Tom Allison folgendes:
>> I would like to create a function/trigger which will update a timestamp on 
>> table A when an UPDATE is executed against table B
>> CREATE FUNCTION update_token(bigint) RETURNS void AS '
>>   UPDATE tokens SET last_seen = now()
>>   WHERE token_idx = $1 and last_seen < now();
>> ' LANGUAGE SQL
>>
>>
>> CREATE TRIGGER touch_token AFTER UPDATE ON user_token FOR EACH ROW
>> EXECUTE PROCEDURE update_token(token_idx)
>>
>>
>> But it doesn't seem to change the filed 'last_seen' on the tokens table...
> 
> I think, you should better create a RULE like this:
> 
> create rule update_rule as on update to user_token do also update tokens set last_seen = now() where token_idx = NEW.token_idx;
> 
> Andreas


This works perfectly.

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