MVC里自己建立数据库访问，出现数据库错误：
Model compatibility cannot be checked because the database does not contain
model metadata. Model compatibility can only be checked for databases created
using Code First or Code First Migrations.
百度无果，隔日Google英文~~
解决方案：
command in Package Manager Console.
1.PM>Enable-Migrations
或者还可以：
2.PM> add-migration Initial
3.PM> Update-Database
问题搞定，生成数据库，还是国外程序员牛逼！
