Hi,
I want to do a check on a column if other columns meet certain
conditions. The program I'm working with allows to create additional
columns on every 'object' - called extra data, but I have no control
over the program. I want to enforce the values on this one extra data
to be of type date.
My idea was to do a Trigger function and cast to a date and if there's
an exception, raise an error. Below is what I've tried, but it just
keeps on Raising Exception.
Could someone please help me? The date I enter is: 2012-10-10 which
works fine if I do a:
select '2012-10-10'::date
Thanks
--Postgres 9.0
CREATE OR REPLACE FUNCTION fnc_check_PO_extra_date() RETURNS trigger AS
$BODY$
DECLARE tmp_date date;
BEGIN IF (TG_OP = 'INSERT' OR TG_OP = 'UPDATE') THEN IF (NEW.data_value IS NOT NULL or new.data_value = '') and
NEW.extra_id = (select extra_id from extra_data where data_type = 9 and (data_name = 'ETA' or
data_name= 'Adjusted ETA')) THEN tmp_date := new.data_value::date; END IF; END IF; EXCEPTION WHEN
othersTHEN RAISE EXCEPTION 'Invalid date on Extra Data!';
return NEW;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
CREATE TRIGGER trg_check_PO_extra_date BEFORE INSERT OR UPDATE ON extra_values FOR EACH ROW EXECUTE PROCEDURE
fnc_check_PO_extra_date();