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 thenRAISE 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