记unit of work与事务提交
https://docs.microsoft.com/en-us/aspnet/mvc/overview/older-versions/getting-started-with-ef-5-using-mvc-4/implementing-the-repository-and-unit-of-work-patterns-in-an-asp-net-mvc-application
https://docs.microsoft.com/en-us/ef/core/saving/transactions
http://www.cnblogs.com/1zhk/p/5309043.html
http://www.cnblogs.com/xishuai/p/3750154.html
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