C:Program FilesMySQLMySQL Server 5.5in>mysqlWelcome to the MySQL monitor. Commands end with ; or g.Your MySQL connection id is 1Server version: 5.5.36 MySQL Community Server (GPL)Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type "help;" or "h" for help. Type "c" to clear the current input statement.mysql> show databases;+--------------------+| Database |+--------------------+| information_schema || mysql || performance_schema || test |+--------------------+4 rows in set (0.00 sec)mysql> use mysql;Database changedmysql> update user set password=PASSWORD("oracle") where user="root";Query OK, 2 rows affected (0.00 sec)Rows matched: 2 Changed: 2 Warnings: 0mysql> flush privileges;Query OK, 0 rows affected (0.01 sec)mysql> quitBye看看那任务管理器中是否有mysqld.exe进程,如有,kill .

C:Program FilesMySQLMySQL Server 5.5in>net start mysql
MySQL 服务正在启动 .
MySQL 服务已经启动成功。
C:Program FilesMySQLMySQL Server 5.5in>mysql -uroot -poracleWelcome to the MySQL monitor. Commands end with ; or g.Your MySQL connection id is 1Server version: 5.5.36 MySQL Community Server (GPL)Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type "help;" or "h" for help. Type "c" to clear the current input statement.mysql>方法二:
mysql>use mysql mysql>update user set password=PASSWORD("new_password") where user="root"; mysql>flush privileges; mysql>quit5. 看看那任务管理器中是否有mysqld.exe进程,如有,kill them all.
e:mysql5.5in>net start mysql e:mysql5.5in>mysql -u root -pnew_password that"s all .