1:首先是mysql服务启动着

2：打开DOS如下,win7系统

Microsoft Windows [版本 6.1.7601]
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C:\Users\Administrator>cd C:\Program Files (x86)\MySQL\MySQL Server 7.0\bin  ------进入到数据库安装目录的bin目录下

C:\Program Files (x86)\MySQL\MySQL Server 7.0\bin>mysql -uroot -p  -------------打开mysql
Enter password: ****-------自动提示输入密码
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.1.39-ndb-7.0.9-cluster-gpl MySQL Cluster Server (GPL)

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement. ---------成功登陆

mysql> set password for root@localhost = password(‘test‘);-------修改密码
Query OK, 0 rows affected (0.00 sec)

mysql> exit----退出
Bye

C:\Program Files (x86)\MySQL\MySQL Server 7.0\bin>mysql -uroot -p-----再次登录
Enter password: ****-----输入原密码
ERROR 1045 (28000): Access denied for user ‘root‘@‘localhost‘ (using password: Y----------------原密码报错登不上
ES)

C:\Program Files (x86)\MySQL\MySQL Server 7.0\bin>mysql -uroot -p-------再次尝试登录
Enter password: ****------输入新密码
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.1.39-ndb-7.0.9-cluster-gpl MySQL Cluster Server (GPL)

Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement.

mysql>-------成功登陆，密码被修改了

mysql更改密码