EF学习记录笔记一

EF中的填加：

T_user user = new T_user();
user.f_username = "jll";
user.f_password = "34";
user.f_passed = 1;
//EF增加
BlogDb.T_user.AddObject(user);
BlogDb.SaveChanges();

//EF修改
 var user1 = (from u in BlogDb.T_user
                         where u.id == 1
                         select u).FirstOrDefault<T_user>();
 user1.f_username = "lyquuu";
BlogDb.SaveChanges();


  //EF修改
            T_user user2 = new T_user() { id = 2, f_username = "mvc123", f_passed = 1, f_password = "123456" };
            BlogDb.T_user.Attach(user2);
            BlogDb.ObjectStateManager.ChangeObjectState(user2, System.Data.EntityState.Modified);
            BlogDb.SaveChanges();


   #region 主从实体增加
            Customer customer = new Customer() { UserName = "jll12344", Address = "广东", Phone = "332", Email = "222" };
            BlogDb.Customer.AddObject(customer);

            Order o1 = new Order();
            o1.ID = Guid.NewGuid();
            o1.Customer = customer;
            o1.OrderContent = "323";
            o1.SubTime = DateTime.Now;

            BlogDb.Order.AddObject(o1);


            BlogDb.SaveChanges();

            #endregion