mysql 修改用户密码

方法1：用SET PASSWORD命令

MySQL -u root
mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpass');

方法2：用mysqladmin

mysqladmin -u root password "newpass"
如果root已经设置过密码，采用如下方法
mysqladmin -u root password oldpass "newpass"

方法3：用UPDATE直接编辑user表

  mysql -u root
　mysql> use mysql;
　mysql> UPDATE user SET Password = PASSWORD('newpass') WHERE user = 'root';
　mysql> FLUSH PRIVILEGES;