在使用联合时，所有传入路径必须在流程继续之前运行。
When using a join, all of the incoming paths must be run before the process continues on.
知道数据库路径后，则可以轻松打开一个应用程序并执行传入的代码。
After you know the database path, it is easy to open the application to execute the code passed in.
如果要使用它，你必须将其实例化，并传入用于创建索引的路径。
To use it you must instantiate it with a path that it can write the index into.
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