MVC 中使用EF

EF

1）简单查询

后台代码

 using MvcApplication18.Models;
 using System;
 using System.Collections.Generic;
 using System.Data.SqlClient;
 using System.Linq;
 using System.Web;
 using System.Web.Mvc;

 namespace MvcApplication18.Controllers
 {
     public class HomeController : Controller
     {
         //
         // GET: /Home/
         appDBEntities db = new appDBEntities();
         public ActionResult Index()
         {
             SqlParameter[] parameter = { };
             List<SecondHand_info> list = db.Database.SqlQuery<SecondHand_info>("select * from SecondHand_info where SecondHand_keyID >88", parameter).ToList();
           ViewData["list"] = list;
             return View();
         }

     }
 }

前台代码

 @model MvcApplication18.Models.SecondHand_info
 @using MvcApplication18.Models
 @{
     ViewBag.Title = "Index";
 }

 @foreach (SecondHand_info item in ViewData["list"] as List<SecondHand_info>)
 {
   <p>@item.SecondHand_keyID </p>
      <p>@item.SecondHand_mobile </p>
      <p>@item.SecondHand_title </p>
      <p>@item.SecondHand_context </p> 

 }

2)带参数查询

后台代码

 using MvcApplication18.Models;
 using System;
 using System.Collections.Generic;
 using System.Data.SqlClient;
 using System.Linq;
 using System.Web;
 using System.Web.Mvc;

 namespace MvcApplication18.Controllers
 {
     public class HomeController : Controller
     {
         //
         // GET: /Home/
         appDBEntities db = new appDBEntities();
         public ActionResult Index()
         {
             var id = "";
             var mobile = "";
             var sql = "select * from SecondHand_info where SecondHand_keyID =@id and SecondHand_mobile=@mobile";
          List<SecondHand_info> list=   db.Database.SqlQuery<SecondHand_info>(
                 sql,
                 new SqlParameter("@id",id),
                 new SqlParameter("@mobile",mobile)

                 ).ToList();
          db.SaveChanges();
           ViewData["list"] = list;
             return View();
         }

     }
 }

前台代码

 @model MvcApplication18.Models.SecondHand_info
 @using MvcApplication18.Models
 @{
     ViewBag.Title = "Index";
 }

 @foreach (SecondHand_info item in ViewData["list"] as List<SecondHand_info>)
 {
   <p>@item.SecondHand_keyID </p>
      <p>@item.SecondHand_mobile </p>
      <p>@item.SecondHand_title </p>
      <p>@item.SecondHand_context </p> 

 }
 <h2>Index</h2>

3)修改

后台代码

using MvcApplication18.Models;
using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcApplication18.Controllers
{
    public class HomeController : Controller
    {
        //
        // GET: /Home/
        appDBEntities db = new appDBEntities();
        public ActionResult Index()
        {

            //修改
            List<SecondHand_info> list = db.Set<SecondHand_info>().SqlQuery("select * from SecondHand_info where SecondHand_keyID =88").ToList();
            list.Last().SecondHand_mobile = "";//把SecondHand_keyID =88 的手机号改为18017848011
            db.SaveChanges();
          ViewData["list"] = list;
            return View();
        }

    }
}

前台代码

 @model MvcApplication18.Models.SecondHand_info
 @using MvcApplication18.Models
 @{
     ViewBag.Title = "Index";
 }

 @foreach (SecondHand_info item in ViewData["list"] as List<SecondHand_info>)
 {
   <p>@item.SecondHand_keyID </p>
      <p>@item.SecondHand_mobile </p>
      <p>@item.SecondHand_title </p>
      <p>@item.SecondHand_context </p> 

 }

4)带参数的存储过程（所以字段都要列出不然会出现问题）

 create proc P_QuerybyId_secondhand
 @SecondHand_keyID int
 as
 begin
 select SecondHand_keyID, SecondHand_mobile, SecondHand_title, SecondHand_new, SecondHand_type, SecondHand_money, SecondHand_context, SecondHand_pic1, SecondHand_pic2, SecondHand_pic3, SecondHand_pic4, SecondHand_pic5, SecondHand_pic, SecondHand_time, Memo FROM SecondHand_info where SecondHand_keyID=@SecondHand_keyID
 end

 using MvcApplication18.Models;
 using System;
 using System.Collections.Generic;
 using System.Data.SqlClient;
 using System.Linq;
 using System.Web;
 using System.Web.Mvc;

 namespace MvcApplication18.Controllers
 {
     public class HomeController : Controller
     {
         //
         // GET: /Home/
         appDBEntities db = new appDBEntities();
         public ActionResult Index()
         {

             var param = new SqlParameter("SecondHand_keyID", );
             List<SecondHand_info> list = db.Database.SqlQuery<SecondHand_info>("P_QuerybyId_secondhand @SecondHand_keyID", param).ToList();
          db.SaveChanges();
           ViewData["list"] = list;
             return View();
         }

     }
 }

 @model MvcApplication18.Models.SecondHand_info
 @using MvcApplication18.Models
 @{
     ViewBag.Title = "Index";
 }

 @foreach (SecondHand_info item in ViewData["list"] as List<SecondHand_info>)
 {
   <p>@item.SecondHand_keyID </p>
      <p>@item.SecondHand_mobile </p>
      <p>@item.SecondHand_title </p>
      <p>@item.SecondHand_context </p> 

 }
 <h2>Index</h2>

5)带输出参数的存储过程

 CREATE PROCEDURE [dbo].[Myproc]
     @Name NVARCHAR(max),
     @PageIndex int,
     @PageSize INT,
     @TotalCount int OUTPUT
 as 

     declare @startRow int
     declare @endRow    int

     set @startRow = (@PageIndex - 1) * @PageSize + 1
     set @endRow = @startRow + @PageSize - 1

     select *
     FROM
     (
         select top (@endRow)
            ID,
             Age,
             Name,
             row_number() over(order by [ID] desc) as [RowIndex]
         from dbo.Student
     ) as T
     where [RowIndex] >= @startRow AND T.Name = @Name

     SET @TotalCount=(select count(1) as N
     FROM dbo.Student WHERE Name = @Name) 

 var name = new SqlParameter { ParameterName = "Name", Value = Name };
             var currentpage = new SqlParameter { ParameterName = "PageIndex", Value = currentPage };
             var pagesize = new SqlParameter { ParameterName = "PageSize", Value = pageSize };
             var totalcount = new SqlParameter { ParameterName = "TotalCount", Value = , Direction = ParameterDirection.Output };

             var list = ctx.Database.SqlQuery<Student>("Myproc @Name, @PageIndex, @PageSize, @TotalCount output",
         name, currentpage, pagesize, totalcount);

             totalCount = (int)totalcount.Value;  /*获得要输出参数totalcount的值*/