这将是我的方法：
每个数据库都会有一个视图，它将向您的应用程序提供所需的数据。
您的应用程序将有一个层来读取数据并将其重新格式化为（相当标准的）数据结构。
然后，您将有一个层来读取这些标准数据结构并将其写入所请求的文件。
This would be my approach:
Each DB would have a view on it that would present the needed data to your app.
Your app would have a layer that would read the data and reformulate it into a (fairly standard) data structure.
Then you would have a layer that would read those standard data structures and write out to the requested files.
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这将是我的方法：
每个数据库都会有一个视图，它将向您的应用程序提供所需的数据。
您的应用程序将有一个层来读取数据并将其重新格式化为（相当标准的）数据结构。
然后，您将有一个层来读取这些标准数据结构并将其写入所请求的文件。
This would be my approach:
Each DB would have a view on it that would present the needed data to your app.
Your app would have a layer that would read the data and reformulate it into a (fairly standard) data structure.
Then you would have a layer that would read those standard data structures and write out to the requested files.