我有触发器
DELIMITER $$
DROP TRIGGER IF EXISTS before_insert_on_emp $$
CREATE TRIGGER before_insert_on_emp
BEFORE insert ON empefforts
FOR EACH ROW BEGIN
DECLARE MSG VARCHAR(100);
IF (NEW.TIMING) > 60
THEN
SET MSG='Error: TIMING must be <=60.';
END IF;
END$$
DELIMITER ;
当条件为真时,我想在控制台上显示 MSG VARIABLE 值。我怎样才能显示这个值。我正在使用mysql 5.0.18版本...