MySQL数据库可以通过触发器，使之无法修改某些字段的数据，同时又不会影响修改其他字段。
| DROP TRIGGER IF EXISTS `members`;SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='';DELIMITER //CREATE TRIGGER `members` BEFORE UPDATE ON `members` FOR EACH ROW BEGIN set new.name = old.name; set new.cellphone = old.cellphone; set new.email = old.email; set new.password = old.password;END//DELIMITER ;SET SQL_MODE=@OLD_SQL_MODE; |
再举一个例子：
| CREATE TABLE `account` ( `id` INT(10) UNSIGNED NOT NULL AUTO_INCREMENT, `user` VARCHAR(50) NOT NULL DEFAULT '0', `cash` FLOAT NOT NULL DEFAULT '0', PRIMARY KEY (`id`))COLLATE='utf8_general_ci'ENGINE=InnoDB; |
每一次数据变化新增一条数据
| INSERT INTO `test`.`account` (`user`, `cash`) VALUES ('neo', -10);INSERT INTO `test`.`account` (`user`, `cash`) VALUES ('neo', -5);INSERT INTO `test`.`account` (`user`, `cash`) VALUES ('neo', 30);INSERT INTO `test`.`account` (`user`, `cash`) VALUES ('neo', -20); |
保护用户的余额不被修改
| DROP TRIGGER IF EXISTS `account`;SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='';DELIMITER //CREATE TRIGGER `account` BEFORE UPDATE ON `account` FOR EACH ROW BEGIN set new.cash = old.cash;END//DELIMITER ;SET SQL_MODE=@OLD_SQL_MODE; |
新闻热点
疑难解答
