如果尚未读过第一篇文章，则应该考虑读一读；其中的基本知识将不会在此处复述。
If you have not read the first article you should consider doing so now; those basics will not be covered here.
我在此处假设读操作(作为api层的入口点)不会对数据库调用写操作。
I am making the assumption here that the read operation (as an entry point to the API layer) is not in turn invoking write operations on the database.
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