[mysql]MySQL修改root密码的多种方法

方法0：使用GRANT语句 
       mysql>grant all on *.* to 'root'@'localhost' IDENTIFIED BY 'newpassword' with grant option ;
       mysql>grant all on *.* to 'root'@'%' IDENTIFIED BY 'newpassword' with grant option ;
       mysql>grant all on *.* to 'root'@'192.168.1.%' IDENTIFIED BY 'newpassword' with grant option ;
       mysql>flush privileges;

方法1：
用SET PASSWORD命令
　　mysql -u root
　　mysql> SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpassword');

方法2：用mysqladmin
　　mysqladmin -u root password "newpassword"
　　如果root已经设置过密码，采用如下方法
　　mysqladmin -u root password oldpass "newpassword"

方法3：
用UPDATE直接编辑user表
　　mysql -u root
　　mysql> use mysql;
　　mysql> UPDATE user SET Password = PASSWORD('newpassword') WHERE user = 'root';
　　mysql> FLUSH PRIVILEGES;

方法4：在丢失root密码的时候，可以这样
　　mysqld_safe --skip-grant-tables&
　　mysql -u root mysql
　　mysql> UPDATE user SET password=PASSWORD("newpassword") WHERE user='root';
　　mysql> FLUSH PRIVILEGES;