Hi,
I'm trying my first PL/pgSQL code to trap foreign key errors. Before inserting
into the table "Exon", I wish to be sure that a foreign key, 'zhvtID', exists in
the table 'zhvt'. Sounds simple...
This is the code I use:
CREATE FUNCTION exon_foreign_keys() RETURNS opaque AS '
DECLARE zhvt_row zhvt%ROWTYPE;
BEGIN IF NEW.zhvtID ISNULL THEN RAISE EXCEPTION ''zhvtID can not be NULL''; END IF;
SELECT * INTO zhvt_row FROM zhvt WHERE zhvtID=NEW.zhvtID; IF NOT FOUND THEN RAISE EXCEPTION
''zhvtID=% is not in TABLE zhvt'' , NEW.zhvtID; END IF;
END;
' LANGUAGE 'plpgsql';
And this is the trigger I create to call the code upon insert:
CREATE TRIGGER check_exon_FK BEFORE INSERT OR UPDATE ON exonFOR EACH ROW EXECUTE PROCEDURE exon_foreign_keys();
And this is the error I get when I try to insert anything, regardless of whether
the foreign key exists or not:
zhvt=> insert into exon (zhvtID, number, start, stop, iscomplement)
zhvt-> values (1, 1, 1, 100, 't');
ERROR: There is no operator '=$' for types 'int4' and 'int4' You will either have to retype this query using an
explicitcast, or you will have to define the operator using CREATE OPERATOR
If I drop the trigger, the error goes away.
Any ideas?
Mark
--
Mark Dalphin email: mdalphin@amgen.com
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