Finally, update the MStudent model with a function to delete the record.
最后，用一个函数更新MStudent模型来删除此记录。
The MStudent model is responsible for interacting with the student table in the database.
MStudent模型负责与数据库内的student表进行交互。
The MStudent model is responsible for interacting with the student table in the database.
MStudent模型负责与数据库内的student表进行交互。
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