MySQL 触发器的定义

-- Insert
DELIMITER $$
 
USE `testdatabase`$$
 
DROP TRIGGER /*!50032 IF EXISTS */ `Trigger_XXX_INSERT`$$
 
CREATE
    /*!50017 DEFINER = 'root'@'%' */
    TRIGGER `Trigger_XXX_INSERT` AFTER INSERT ON `TB_XXX`
    FOR EACH ROW BEGIN
    DECLARE newStatus INT;
    SET newStatus = NEW.`Status`;
        -- 省略do something
    END;
$$
 
DELIMITER ;
 
-- Update
DELIMITER $$
 
USE `testdatabase`$$
 
DROP TRIGGER /*!50032 IF EXISTS */ `Trigger_XXX_UPDATE`$$
 
CREATE
    /*!50017 DEFINER = 'root'@'%' */
    TRIGGER `Trigger_XXX_UPDATE` BEFORE UPDATE ON `TB_XXX`
    FOR EACH ROW BEGIN
    DECLARE oldStatus INT;
    DECLARE newStatus INT;
    SET oldStatus = OLD.`ConsultationStatus`;
    SET newStatus = NEW.`ConsultationStatus`;
 
    IF (newStatus <> oldStatus)
    THEN
        -- continue do something
    END IF;
    END;
$$
 
DELIMITER ;