Client does not support authentication protocol

   前面忘记说了,运行过程中还出现过上面那个title的错误....

 

官方的说法是

MySQL 4.1 and up uses an authentication protocol based on a password hashing algorithm that is incompatible with that used by older clients.

 

  解决办法是：

UPDATE mysql.user SET Password = OLD_PASSWORD('newpwd')
   WHERE  User = 'usrname';
 

update后还有重启下mysql服务,在运行程序就可以了