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mysql大小写敏感的一个解决方案_MySQL

May 27, 2016 pm 02:12 PM
mysql Case Sensitive

今天,有同事告诉我,我们游戏登陆的时候,账号和密码没有区分大小写,后来又发现创建账号和角色也没有区分大小写。思考登陆流程之后,应该是Mysql没有区分大小写敏感的问题。

在网上查了一下资料,Mysql支持大小写敏感的解决方案。发现了几种方案。

第一、修改数据库的设置,让Mysql支持大小写敏感,这个方案太激进了,数据库数据太多,这样改保不准会出什么问题。

第二、修改表结构和字符集,和第一种方案差不多,但是风险小一点。

第三、修改存储过程或者SQL语句,好处是不动数据库结构,缺点是涉及到的地方都的改。

权衡之后,还是选了第三种方案,只修改登录和创建的2个存储过程。

体方法是,使用mysql的binary关键字。

BINARY不是函数,是类型转换运算符,它用来强制它后面的字符串为一个二进制字符串,可以理解为在字符串比较的时候区分大小写。

测试如下:
   

mysql> select binary 'ABCD'='abcd' ret1, 'ABCD'='abcd' ret2;
     +--------+--------+
     |   ret1  |   ret2 |
     +--------+--------+
     |    0     |     1    |
     +--------+--------+
     1 row in set (0.00 sec)
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