升级MySQL到5.x后

使用：
GRANT ALL ON database.* TO some_user@'%' IDENTIFIED BY 'newpwd';
创建的用户。

使用旧的mysql clinet通过网络连接数据库总是提示：

shell> mysql
Client does not support authentication protocol requested
by server; consider upgrading MySQL client

解决办法：

mysql> SET PASSWORD FOR
    -> 'some_user'@'some_host' = OLD_PASSWORD('newpwd');

or

mysql> UPDATE mysql.user SET Password = OLD_PASSWORD('newpwd')
    -> WHERE Host = 'some_host' AND User = 'some_user';
mysql> FLUSH PRIVILEGES;

这样就OK了