实体框架（Entity Framework）是微软以ADO.Net为基础开发出来的对象关系映射（ORM）解决方案，它解决了对象持久化问题，将程序员从编写麻烦的SQL语句当中解放出来。

本文档从零开始教你操作数据库-Entity Framework (Entity Framework) is the Microsoft ADO.Net is developed on the basis of object-relational mapping (ORM) solution, it solves the problem of object persistence, the programmer is freed from the preparation of the trouble which SQL statements. This document from scratch teach you to operate the database