Postgresql 触发器

触发器函数：
CREATE FUNCTION order_status () RETURNS TRIGGER AS $status$ 
      BEGIN
	IF ( NEW.status = 3 ) THEN
			NEW.status := 3;
	ELSE
			NEW.status := 2;
	END IF;
	RETURN NEW;
END $status$ LANGUAGE plpgsql;


创建触发器：
CREATE TRIGGER order_status BEFORE UPDATE OF status ON public.hd_order FOR EACH ROW EXECUTE PROCEDURE public.order_status();


删除函数：DROOP function order_status ();