Hi all !
I use PostgreSQL 7.0.2 on a HP-UX system.
I would like to create a simple function and a simple trigger (or rule) that
deny a delete from a table if the row is referenced in another table.
I though it should look like this (from my Ingres experience... :) :
create function A_del(int4 i_id)
BEGIN
SELECT id
FROM b
where a_id = :i_id;
if rowcount > 0 then
RAISE EXCEPTION "not allowed !"
end if;
END
create trigger before delete from A for each row execute procedure A_del(old.id)
But it seems to be much more complicated with Postgres (create a C function
using CurrentTriggerData,...). May I have missed something or is it really much
more complicated ?
Thanks for help.
_____________
B. Carrupt
---------------------------(end of broadcast)---------------------------
TIP 1: subscribe and unsubscribe commands go to [EMAIL PROTECTED]
