CodeFirst

特点：（从实体到数据库）

1：自己写实体，和连接数据库的字符串，

<connectionStrings>    <add name="CodeFirstContext"           providerName="System.Data.SqlClient"           connectionString="Server=.;Database=CodeFirstDB;Trusted_Connection=true;Pwd=123456;"/>      </connectionStrings>

  public class ModelFirstDB:DbContext    {        public ModelFirstDB()            : base("name=CodeFirstContext")        {                        }        //重写方法  判断是否含有，如果有覆盖        protected override void OnModelCreating(DbModelBuilder modelBuilder)        {            modelBuilder.Conventions.Remove<System.Data.Entity.ModelConfiguration.Conventions.PluralizingTableNameConvention>();        }        public DbSet<UserInfo> UserInfo { get; set; }        public DbSet<ScoreInfo> ScoreInfo { get; set; }    }