From: | Craig Ringer <craig(at)postnewspapers(dot)com(dot)au> |
---|---|
To: | Medi Montaseri <montaseri(at)gmail(dot)com> |
Cc: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: Update and trigger |
Date: | 2008-06-11 05:35:32 |
Message-ID: | 484F6424.5040202@postnewspapers.com.au |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-sql |
Medi Montaseri wrote:
> Hi,
>
> I need to increament a counter such as myTable.Counter of type integer
> everytime myTable.status a boolean column is updated. Can you help me
> complete this...
>
> create trigger counter_trigger after update on myTable.counter
> execute procedure 'BEGIN statement; statement; statement END'
>
> Q1- how do I narrow the event to "update on a column not a row"
Use a row-level trigger and test to see if the column of interest has
been altered. Eg:
IF new.fieldname IS DISTINCT FROM old.fieldname THEN
-- Do the work
END IF;
> Q2- can I just provide an inline procedure for the execute
No, at present you must create a function that returns TRIGGER and then
use that as the target to execute. At least as far as I know.
--
Craig Ringer
From | Date | Subject | |
---|---|---|---|
Next Message | Medi Montaseri | 2008-06-11 07:54:55 | Re: Update and trigger |
Previous Message | A. Kretschmer | 2008-06-11 05:21:07 | Re: Update and trigger |