通常来说，模型类将包含帮助你对数据库进行增删改查的方法。
Typically your model classes will contain functions that help you retrieve, insert, and update information in your database.
通常来说，模型类将包含帮助你对数据库进行增删改查的方法。
Typically your model classes will contain functions that help you retrieve, insert, and update information in your database.
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