mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication解决办法

mysqlnd是个好东西。不仅可以提高与mysql数据库通信的效率,而且也可以方便的设置一些超时。如,连接超时,查询超时。
但是,使用mysqlnd的时候,有个地方需要注意。就是服务端的密码格式不能使用旧的16位的存储格式,而要使用新的41位的存储格式。
如果,服务端的密码格式是16位,那么就会报错。信息如下:
Fatal error: Uncaught exception ‘PDOException’ with message ‘SQLSTATE[HY000] [2000] mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication. Please use an administration tool to reset your password with the command SET PASSWORD = PASSWORD(‘your_existing_password’). This will store a new, and more secure, hash value in mysql.user. If this user is used in other scripts executed by PHP 5.2 or earlier you might need to remove the old-passwords flag from your my.cnf file’ in /home/hailong.xhl/test.php:8

如何查看自己的密码是否符合要求,so easy。

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mysql> select user,length(password) from mysql.user;
+--------------+------------------+
| user         | length(password) |
+--------------+------------------+
| demo         |               16 |
| demo         |               16 |
+--------------+------------------+

上面的密码是旧的16位格式。如果想改成新的41位格式,通过以下命令就可以。

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mysql>UPDATE mysql.user SET Password = PASSWORD( 'demo' ) WHERE user = 'demo' ;
Query OK, 2 rows affected (0.00 sec)
Rows matched: 2  Changed: 2  Warnings: 0
mysql> select user,length(password) from mysql.user;
+--------------+------------------+
| user         | length(password) |
+--------------+------------------+
| demo         |               41 |
| demo         |               41 |
+--------------+------------------+
mysql> flush privileges;
Query OK, 0 rows affected (0.00 sec)

修改完密码后,还需要在配置文件中修改下old_passwords选项。把值设置为0。即,
old_passwords=0
然后重启mysql。


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