On 12/08/10 18.59, Edoardo Panfili wrote:
hi,
I am in some trouble with my tables defined using inheritance, This is a
semplified test case:
-----------------------
create table sub1( name1 text) inherits(father);
create table sub2( name2 text) inherits(father);
create table other (description text, id integer);
-- I know, the contraints is not checked in sub1 and sub2
ALTER TABLE father ADD UNIQUE(id);
ALTER TABLE other ADD FOREIGN KEY (id) REFERENCES father(id);
insert into sub1 (id,name1) VALUES(1,'row1 in sub1');
insert into sub2 (id,name2) VALUES(2,'row1 in sub2');
select * from father;
id
----
1
2
------------------------
I can't insert data in "other" table:
-----------------------------
test=# insert into other(id,description) VALUES(1,'test');
ERROR: insert or update on table "other" violates foreign key constraint
"other_id_fkey"
DETAIL: Key (id)=(1) is not present in table "father".
-----------------------------
Is there a way to do this thing? Or I must remove the foreign key
constraint?
trigger solution, it seems ok but I am still searching for a declarative
one.
CREATE OR REPLACE FUNCTION insert_veto() RETURNS trigger AS
$BODY$
DECLARE
present boolean;
BEGIN
present := exists (select * from father where id=NEW.id) ;
IF present THEN
return NULL;
ELSE
RETURN NEW;
END IF;
END
$BODY$ LANGUAGE 'plpgsql'
CREATE TRIGGER veto BEFORE INSERT OR UPDATE ON other FOR EACH ROW
EXECUTE PROCEDURE insert_veto();
Edoardo
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