命令行进入mysql:
　　首先确认环境变量里面有如下配置:C:Program FilesMySQLMySQL Server 5.5in
　　才能在进入黑窗口直接适用mysql命令，否则需要在黑窗口进入mysql的bin目录在执行mysql命令.
　　使用 root 和123456登陆:
C:Documents and SettingsAdministrator>mysql -u root -p
Enter password: ******
Welcome to the MySQL monitor.  Commands end with ; or g.
Your MySQL connection id is 25
Server version: 5.5.19 MySQL Community Server (GPL)
Copyright (c) 2000， 2011， Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
mysql>
===========================================================
mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| dmp                |
| hdmp               |
| hms                |
| mysql              |
| ods_produce        |
| performance_schema |
| test               |
| wms                |
+--------------------+
9 rows in set (0.02 sec)
mysql> use mysql;
Database changed
mysql> update user set password=PASSWORD("123456") WHERE user='root'
mysql> FLUSH PRIVILEGES;
mysql> QUIT
======================================================
mysql数据库文件默认存放路径:C:Documents and SettingsAll UsersApplication DataMySQLMySQL Server 5.5data