Entity Framework (先创建数据库Model类,以及操作数据库的方法。 最后从代码生成数据库和数据库模型)

     The Entity Framework (often referred to as EF) supports a development paradigm called Code First. Code First allows you to create model objects by writing simple classes. (These are also known as POCO classes, from "plain-old CLR objects.") You can then have the database created on the fly from your classes, which enables a very clean and rapid development workflow.