使用字符串“shutdown”来调用 setShutdownDatabase 方法，然后需要调用 getConnection 来执行关闭操作。

The setShutdownDatabase method is called with the string "shutdown", and then a call to getConnection is required to actually perform the shutdown.

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可以使用字符串(实例)方法来操作任何属性值，还可以调用许多系统类的静态方法。

You can use string (instance) methods to operate on any property value, and you can call the static methods of many system classes.

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