LocalDB数据库的增删改查方法

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Mvc;
using Movies.Models;

namespace Movies.Controllers
{



    //LocalDB的增删改查方法
    public class MoviesController : Controller
    {
        private MovieDBContext db = new MovieDBContext();

        // GET: /Movies/主页面
        public ActionResult Index()
        {
            //查询全部
            return View(db.Movies.ToList());
        }

        // GET: /Movies/Details/5 电影详细
        public ActionResult Details(int? id)
        {
            ////参数不正确，直接抛出对应的HttpStatusCodeResult结果
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            //根据id进行查询，查询出来的结果放在Movie类的Movie对象里
            Movie movie = db.Movies.Find(id);
            //如果一个电影没有找到，返回HttpNotFound()
            if (movie == null)
            {
                return HttpNotFound();
            }
            return View(movie);
        }

        // GET: /Movies/Create添加一条新电影，返回一个视图
        public ActionResult Create()
        {
            return View();
        }

        // POST: /Movies/Create
      
        [HttpPost]
        [ValidateAntiForgeryToken]
        //在添加电影的视图里获取值并添加到数据库，添加成功返回主页面
        public ActionResult Create([Bind(Include="ID,Title,ReleaseDate,Genre,Price")] Movie movie)
        {
            if (ModelState.IsValid)
            {
                db.Movies.Add(movie);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            return View(movie);
        }

        // GET: /Movies/Edit/5 修改电影详细，返回一个修改界面的视图，并把查出数据movie用强类型传达到界面
        public ActionResult Edit(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            Movie movie = db.Movies.Find(id);
            if (movie == null)
            {
                return HttpNotFound();
            }
            return View(movie);
        }

        // POST: /Movies/Edit/5
        // 为了防止“过多发布”攻击，请启用要绑定到的特定属性，有关 
        // 详细信息，请参阅 http://go.microsoft.com/fwlink/?LinkId=317598。
        [HttpPost]
        [ValidateAntiForgeryToken]
        //在修改视图里进行修改，这是修改方法，修改后返回主界面。强类型传数据
        public ActionResult Edit([Bind(Include="ID,Title,ReleaseDate,Genre,Price")] Movie movie)
        {
            if (ModelState.IsValid)
            {
                db.Entry(movie).State = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");
            }
            return View(movie);
        }


        //控制器返回一个删除的视图，并把查出数据movie用强类型传达到界面
        // GET: /Movies/Delete/5 删除电影
        public ActionResult Delete(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            Movie movie = db.Movies.Find(id);
            if (movie == null)
            {
                return HttpNotFound();
            }
            return View(movie);
        }

        // POST: /Movies/Delete/5
        [HttpPost, ActionName("Delete")]
        [ValidateAntiForgeryToken]
        //删除的方法，删除后直接返回主界面
        public ActionResult DeleteConfirmed(int id)
        {
            Movie movie = db.Movies.Find(id);
            db.Movies.Remove(movie);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                db.Dispose();
            }
            base.Dispose(disposing);
        }
    }
}

@*强类型声明，后面是引用的命名空间*@
@model Movies.Models.Movie
@{
    ViewBag.Title = "Details";
}

<h2>Details</h2>

<div>
    <h4>Movie</h4>
    <hr />
    @*<dl>
        标签定义了定义列表（definition list）。
        <dl>
            标签用于结合
            <dt> （定义列表中的项目）和
            <dd>
                （描述列表中的项目）。*@
                <dl class="dl-horizontal">
                    <dt>
                        @*主页里的列名*@
                        @Html.DisplayNameFor(model => model.Title)
                    </dt>

                    <dd>
                        @Html.DisplayFor(model => model.Title)
                    </dd>

                    <dt>
                        @Html.DisplayNameFor(model => model.ReleaseDate)
                    </dt>

                    <dd>
                        @Html.DisplayFor(model => model.ReleaseDate)
                    </dd>

                    <dt>
                        @Html.DisplayNameFor(model => model.Genre)
                    </dt>

                    <dd>
                        @Html.DisplayFor(model => model.Genre)
                    </dd>

                    <dt>
                        @Html.DisplayNameFor(model => model.Price)
                    </dt>

                    <dd>
                        @Html.DisplayFor(model => model.Price)
                    </dd>

                </dl>
</div>
<p>
    @Html.ActionLink("Edit", "Edit", new { id = Model.ID }) |
    @Html.ActionLink("Back to List", "Index")
</p>