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Triggers | rules for column updates

From: Szentpali Janos <ianus(at)easynet(dot)ro>
To: pgsql-novice(at)postgresql(dot)org
Subject: Triggers | rules for column updates
Date: 2008-03-03 13:47:58
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Lists: pgsql-novice

I want to prevent any changes to a tuple if a field of the tuple has a 
certain value. Let's say I have a table with column col_1, col_2, col_3. 
I want to create something that will prevent updating col_2 and col_3 if 
and only if col_1 is say "1".
Can I use a rule to do that. Can I somehow detect in a trigger function 
the name of the columns that are updated? If I could do that, it would 
be easy to create a trigger that would do the job.
I am also opened to other kind of solutions that you might know of.
Any help will be appreciated ;)

Szentpáli János


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Next:From: A. KretschmerDate: 2008-03-03 14:16:26
Subject: Re: Triggers | rules for column updates
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Subject: Function problem after alter table

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