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;