1、 //创建EF映射对象数据集
static Models.db_JiaoYouEntities DbDeleteData = new Models.db_JiaoYouEntities();
2、 #region 得到数据集合+Query()
/// <summary>
/// 得到数据集合
/// </summary>
/// <returns></returns>
public List<Models.tb_Msg> Query()
{
Models.db_JiaoYouEntities DbQueryData = new Models.db_JiaoYouEntities();
List<Models.tb_Msg> MsgList = DbQueryData.tb_Msg.Where(c => c.Sender == "b").ToList();
return MsgList;
}
#endregion
3、 #region Mvc +EF 的 add()增加操作
// 1、声明EF
// 2、完成对应数据表对象的数据添加
// 3、调用声明的ef的对应表的添加操作
// 4、ef的SaveChange()操作
public static string add() {
Models.db_JiaoYouEntities DbData = new Models.db_JiaoYouEntities();
Models.tb_Msg Msg = new Models.tb_Msg();
Msg.ID = 123;
Msg.Accepter = "a";
Msg.CheckRead = true;
Msg.Msg = "info";
Msg.MsgDate = DateTime.Now;
Msg.Sender = "b";
DbData.tb_Msg.Add(Msg);
DbData.SaveChanges();
return "测试成功！";
}
#endregion
4、 #region EF编辑操作
/// <summary>
/// EF编辑操作
/// </summary>
/// <returns></returns>
public static string Edit()
{
Models.db_JiaoYouEntities DbUpdateData = new Models.db_JiaoYouEntities();
Models.tb_Msg UpdateMsg = DbUpdateData.tb_Msg.Where(c => c.Sender == "b" && c.Accepter == "a").FirstOrDefault();
UpdateMsg.Accepter = "c";
DbUpdateData.SaveChanges();
return "ce";
}
#endregion
5、 #region EF删除操作
public static string Delete()
{
//删除要使用主键做标识
Models.tb_Msg MsgRemove = new Models.tb_Msg() { ID = 32 };
DbDeleteData.tb_Msg.Attach(MsgRemove);
DbDeleteData.tb_Msg.Remove(MsgRemove);
DbDeleteData.SaveChanges();
return "";
}
#endregion
6、 #region EF查询操作
/// <summary>
/// EF查询操作
/// </summary>
/// <returns></returns>
public ActionResult Index()
{
// Edit();
// Delete();
// ViewBag.Result = add();
//调用查询方法,将数据采用ViewBag接收数据传递给视图
//ViewBag.List = Query();
return View();
}
#endregion