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 Regards Pavel Stehule > > Many thanks in advance ! > > Kind regards, > > -- > Bruno Baguette - bruno.baguette@xxxxxxxxx > > -- > Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-general > -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
