MySQL数据库安全之防止撰改的方法
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 BEFOR
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;
