Le 24/10/09 06:46, Pavel Stehule a écrit :
2009/10/24 Bruno Baguette <bruno.baguette@xxxxxxxxx>:
Hello !
I'm trying to write a little trigger function with variable arguments
quantity (at least one, but can be 2,3,4 arguments).
Theses arguments are fields name, so only varchar variable.
Since it is a dynamic query, I use the EXECUTE statement as explained on
<http://www.postgresql.org/docs/8.3/interactive/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN>
CREATE OR REPLACE FUNCTION delete_acl_trigger() RETURNS trigger AS
$delete_acl_trigger$
DECLARE
BEGIN
FOR i IN 0 .. TG_NARGS LOOP
EXECUTE 'SELECT delete_acl(OLD.' || TG_ARGV[i] || ');';
END LOOP;
RETURN OLD;
END;
$delete_acl_trigger$ LANGUAGE plpgsql;
But, when the trigger is triggered, I receive this error message :
"Query failed: ERROR: OLD used in query that is not in a rule"
How can I get the value of the OLD.' || TG_ARGV[i] field ?
OLD is variable only in PLpgSQL procedure, - outside doesn't exists.
If you have a 8.4, you can use USING clause
EXPLAIN 'SELECT $1.' || TG_ARGV[i] INTO somevar USING OLD;
http://www.postgresql.org/docs/8.4/static/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN
Hello Pavel,
Thanks for your answer !
Unfortunately, I'm running PostgreSQL 8.3.7 (PostgreSQL 8.3.7 on
i586-mandriva-linux-gnu, compiled by GCC i586-mandriva-linux-gnu-gcc
(GCC) 4.2.3 (4.2.3-6mnb1)).
Since 8.4.1 is not available for Mandriva 2009.1, I can only have this
PostgreSQL version. (I don't have root access on that server).
Is there another way, usable in PostgreSQL 8.3.7, to solve my problem ?
Many thanks in advance !
Kind Regards,
--
Bruno Baguette - bruno.baguette@xxxxxxxxx
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