Upgrade MySQL

原先使用的是MySQL 4.0.24，现在的最新版本是MySQL 4.1.13。
察看了官方网站的Upgrading MySQL on Windows：

Download the latest Windows distribution of MySQL from http://dev.mysql.com.

Before upgrading MySQL, you must stop the server.

If the server is installed as a service, stop the service with the following command from the command prompt:

C:\> NET STOP MySQL

If you are not running the MySQL server as a service, use the following command to stop the server:

C:\> C:\mysql\bin\mysqladmin -u root shutdown

When upgrading to MySQL 4.1.5 or higher from a previous version, or when upgrading from a version of MySQL installed from a Zip archive to a version of MySQL installed with the MySQL Installation Wizard, you must manually remove the previous installation and MySQL service (if the server is installed as a service).

To remove the MySQL service, use the following command:

C:\> C:\mysql\bin\mysqld --remove

If you do not remove the existing service, the MySQL Installation Wizard may fail to properly install the new MySQL service. （我就是这一步没有做，造成安装失败）后来运行了以下命令，删除了该服务
c：>sc delete mysql