mysql修改密码

在MySQL中修改一个用户（比如叫"username"）的密码.
一.方法1

mysql＞ UPDATE user SET password=PASSWORD("new password") WHERE user='username'; 
mysql＞ FLUSH PRIVILEGES; 
 

 mysql> REPLACE INTO mysql.user (Host,User,Password) VALUES('%','username',PASSWORD('password')); 
mysql＞ FLUSH PRIVILEGES;  

二.方法2

mysql＞ SET PASSWORD FOR username=PASSWORD('new password'); 

mysql＞ SET PASSWORD FOR username@"%" = PASSWORD('password'); 

三.方法3

使用命令mysqladmin 

mysqladmin -u root -p password mypasswd 

四.方法4
使用phpmyadmin，这是最简单的了，修改mysql库的user表,必须使用PASSWORD函数

五.增加用户

mysql> GRANT USAGE ON *.* TO username@"%" IDENTIFIED BY 'password'; 

mysql> GRANT RELOAD,PROCESS ON *.* TO username@localhost;

mysql>GRANT ALL PRIVILEGES ON *.* TO username@"%" IDENTIFIED BY 'something' WITH GRANT OPTION; 

mysql>GRANT ALL PRIVILEGES ON *.* TO username@localhost IDENTIFIED BY 'something' WITH GRANT OPTION;