On Nov 20, 2007 10:59 AM, Mag Gam <magawake@gmail.com> wrote:
> I want to write a trigger, for UPDATE/INSERT, do a ltrim and rtrim() of name
> value. I want to remove all the beginning and ending blank spaces.
The PostgreSQL docs are really good:
http://www.postgresql.org/docs/8.2/static/plpgsql-trigger.html
Base on the examples from the docs, you could do:
CREATE TABLE T(
ID INTEGER,
NAME TEXT
);
CREATE OR REPLACE FUNCTION T_F() RETURNS TRIGGER AS $$
BEGIN
IF TG_OP IN ('UPDATE','INSERT') THEN
NEW.NAME = TRIM(NEW.NAME);
END IF;
RETURN NEW;
END;
$$ LANGUAGE PLPGSQL;
CREATE TRIGGER T_T
BEFORE INSERT OR UPDATE ON T
FOR EACH ROW EXECUTE PROCEDURE T_F();
-- TEST
INSERT INTO T VALUES (1, ' A ');
SELECT * FROM T;
Good luck.
