DBClose关闭当前打开的数据库。
现在不需要到同一数据库的两个连接，因此可以使用disconnect；命令关闭当前连接。
You don't need two connections to the same database right now, so you can use the disconnect; command to close the current connection.
到达截至日期时，请确保所有用户都完成了当前工作，然后通过关闭数据库服务或从网络断开数据库来断开对服务器的访问。
When the deadline arrives, make sure that all users are finished, then cut access to the server by either shutting down database services or unplugging the database from the network.
当应用程序关闭时，会关闭数据库连接、保存当前状态，等等。
When the application shuts down, it can close database connections, save the current state, and so on.
当应用程序关闭时，会关闭数据库连接、保存当前状态，等等。
When the application shuts down, it can close database connections, save the current state, and so on.
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