如果忘記密碼--skip-grant-tables

1、alter user

alter user test@'localhost' identified by 'xxxx!';

2、grant

show grants for test@'localhost';
GRANT USAGE ON *.* TO 'test'@'localhost' IDENTIFIED BY PASSWORD   '*xxxxxxxxxxxxx';

GRANT USAGE ON *.* TO 'test'@'localhost' IDENTIFIED BY    'xxxxxxxxxxxxx';

3、set password

set password for test@'localhost'=password('xxx')

4、update mysql.user

mysql> UPDATE mysql.user SET Password = PASSWORD('newpass') WHERE user = 'test' and host='localhost';
mysql> FLUSH PRIVILEGES;

5、mysqladmin

    mysqladmin -u test password "newpass" #第一次設置
    mysqladmin -u test password oldpass "newpass"   #如果root已經設置過密碼，采用如下方法

MySQL 用戶和權限管理