Trigger.. AFTER and BEFORE with specific column changed
*I'm trying to follow this :*
CREATE TRIGGER check_update
*BEFORE* UPDATE ON accounts
FOR EACH ROW
WHEN (OLD.balance IS DISTINCT FROM NEW.balance)
EXECUTE PROCEDURE check_account_update();
*but with AFTER instead of BEFORE. and I'm keep getting error on or near
WHEN.
does that because i have to use BEFORE ? what if i need to execute the
procedure after updating column and it has really changed.*
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On 04/01/2012 11:45 AM, Albert wrote:
*I'm trying to follow this :*
CREATE TRIGGER check_update
*BEFORE* UPDATE ON accounts
FOR EACH ROW
WHEN (OLD.balance IS DISTINCT FROM NEW.balance)
EXECUTE PROCEDURE check_account_update();*but with AFTER instead of BEFORE. and I'm keep getting error on or near
WHEN.
What is the error message?
does that because i have to use BEFORE ? what if i need to execute the
procedure after updating column and it has really changed.*
Depends what the procedure is doing. For more detail on what the WHEN
does in BEFORE and AFTER triggers see here:
http://www.postgresql.org/docs/9.0/interactive/sql-createtrigger.html
Look for the Notes section.
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Adrian Klaver
adrian.klaver@gmail.com
*i get:*
Syntax error at or near 'WHEN'
LINE 1: ... check_update AFTER UPDATE ON accounts FOR EACH ROW WHEN
(OLD.balance IS DISTINCT FROM NEW.balance) ....
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On 04/01/2012 10:10 PM, Albert wrote:
*i get:*
Syntax error at or near 'WHEN'
LINE 1: ... check_update AFTER UPDATE ON accounts FOR EACH ROW WHEN
(OLD.balance IS DISTINCT FROM NEW.balance) ....
Hmmm. So two questions:
What happens if you copy the example in the docs exactly and use NEW.*
and OLD.*?
What is the table definition for accounts?
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Adrian Klaver
adrian.klaver@gmail.com
Albert <oo_O2_oo@hotmail.com> writes:
*i get:*
Syntax error at or near 'WHEN'
LINE 1: ... check_update AFTER UPDATE ON accounts FOR EACH ROW WHEN
(OLD.balance IS DISTINCT FROM NEW.balance) ....
Does the BEFORE case work for you either? I'm suspicious that you
are using a PG version that predates WHEN-clause support in triggers.
regards, tom lane