EF学习记录笔记一

EF中的填加：

 

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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