分级行处理法贪心方法 Greedy method with graded row action method
用来创建元素的方法与文档关联并成为一个整体，所以我需要在所有者文档中检索当前我正在处理的元素（第 17 行）。
The method used to create an element is associated with the document as a whole, so I need to retrieve the owner document for the element I'm currently processing (line 17).
第一行（和它上面的方法）处理设置数据库基础结构的低层细节。
The first (and the methods above it) deals with the low-level details of setting up database infrastructure.
最后一行表示方法结果的常规处理，前面的五行是日志代码的输出结果。
The last line represents the normal processing of the method result. The five previous lines are output from the logging code.
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