Hi to everyone.
I've got some problem with rules.
-- I have 2 tables
CREATE TABLE a (email varchar(20), name varchar(10), num1 smallint, num2 smallint, PRIMARY KEY (email, name));
CREATE TABLE b (id smallint PRIMARY KEY, email_a varchar(20), name_a varchar(10), tot smallint, FOREIGN KEY (email_a, name_a) REFERENCES a(email, name));
/*
My goal is to calculate and insert automatically the value of “tot” when I insert a row into table b.
*/
-- Some samples
INSERT INTO a VALUES ('mail1@email.com','bill',3,5);
INSERT INTO a VALUES ('2mail@email.com','paul',4,7);
-- Then I created a simple function
CREATE OR REPLACE FUNCTION calc(varchar(10), varchar(20)) RETURNS smallint AS $$
DECLARE
rowww a%ROWTYPE;
BEGIN
SELECT * INTO rowww FROM a WHERE email = $1 AND name = $2;
IF FOUND
THEN RETURN rowww.num1 * rowww.num2;
ELSE
RAISE WARNING 'Error: values non found!';
END IF;
END;
$$ LANGUAGE plpgsql;
-- And this easy rule
CREATE RULE rrr_a_b AS ON INSERT TO b
DO INSTEAD
INSERT INTO b VALUES
(NEW.id,
NEW.email_a,
NEW.name_a,
(SELECT calc(NEW.email_a, NEW.name_a))
);
-- Sample for insert into b
INSERT INTO b VALUES (33,'mail1@email.com','bill');
Trying to insert into b (and using the new rule defined by myself, i receive this message:
ERROR: infinite recursion detected in rules for relation "b"
How I could solve this problem?
