在 MVC4 中更新数据库记录答案

【问题标题】：Update record on database in MVC4在 MVC4 中更新数据库记录
【发布时间】：2015-11-14 23:17:30
【问题描述】：

在这里需要一些帮助..

目的：在MVC4中更新数据库记录

我有一个带有两个按钮的 Accordian 视图 #1.Edit #2.save.. 到目前为止所做的是..

使用以下代码，我已经从数据库中获取数据到相应的文本框。

第 1 步：在文本框中填写的数据属性设置为只读，一旦点击编辑按钮，文本框将设置为可编辑。

第 2 步：如果我更改数据并单击应在数据库上更新的保存按钮

问题：

更新数据库中的数据时，更新数据是作为新数据添加到新行中。但我需要更新现有数据

查看：

<body>

    <div id='cssmenu'>
        <ul>
            <li class='active'></li>
            <li class='has-sub'>
                <a href='#'><span>Profile</span></a>
                <ul>
                    <form method="post" >
                    <table>
                        <tr>
                            <td>
                                @Html.DisplayNameFor(model => model.FirstName)
                            </td>
                            <td>
                                @Html.TextBoxFor(m => m.FirstName, new { @readonly = "readonly" })
                            @*@Html.EditorFor(model => model.FirstName)*@
                                @Html.ValidationMessageFor(model => model.FirstName)
                            </td>
                        </tr>
                        <tr>
                            <td>
                                @Html.DisplayNameFor(model => model.LastName)
                            </td>
                            <td>
                                @Html.TextBoxFor(m => m.LastName, new { @readonly = "readonly" })
                                @Html.ValidationMessageFor(model => model.LastName)
                            </td>
                        </tr>
                        <tr>
                            <td>
                                @Html.DisplayNameFor(model => model.EmailID)
                            </td>
                            <td>
                                @Html.TextBoxFor(m => m.EmailID, new { @readonly = "readonly" })
                                @Html.ValidationMessageFor(model => model.EmailID)
                            </td>
                        </tr>
                        <tr>
                            <td>
                                @Html.DisplayNameFor(model => model.MobileNumber)
                            </td>
                            <td>
                                @Html.TextBoxFor(m => m.MobileNumber, new { @readonly = "readonly" })
                                @Html.ValidationMessageFor(model => model.MobileNumber)
                            </td>
                        </tr>
                    </table>
                 <input type="button" id="btn" name="Edit" value="Edit"/>
                        <input type="submit" name="Save" id="Save" />
                        @*<input type="submit" name="Save" value="Save" onclick="location.href='@Url.Action("Save", "CU")'" />*@
               </form>
                </ul>
            </li>


             <li class='has-sub'>
                <a href='#'><span>Change Password</span></a>
                <ul>
                    <li><a href='#'><span>Company</span></a></li>
                    <li class='last'><a href='#'><span>Contact</span></a></li>
                </ul>
            </li>
            <li class='has-sub'>
                <a href='#'><span>Add Customer</span></a>
                <ul>
                    <li><a href='#'><span>Company</span></a></li>
                    <li class='last'><a href='#'><span>Contact</span></a></li>
                </ul>
            </li>
        </ul>
    </div>

</body>

@section scripts
{

    <script type="text/javascript">

        $("#btn").click(function () {
            $("#FirstName").removeAttr("readonly");
            $("#LastName").removeAttr("readonly");
            $("#EmailID").removeAttr("readonly");
            $("#MobileNumber").removeAttr("readonly");

        });

    </script>

    }

控制器

 public ActionResult AccountPanel(int id, string Save, string FirstName)
        {

            var profile = (from s in db.tblUsers
                               where s.UserTypeId == 3 && s.UserID == id
                               select new Profile
                               {
                                   FirstName = s.FirstName,
                                   LastName = s.LastName,
                                   EmailID = s.EmailID,
                                   MobileNumber = s.MobileNumber


                               }).FirstOrDefault();



                if (Save != null)
                {

                    using (var context = new SYTEntities())
                    {
                        var s = context.tblUsers.Where(a => a.UserID == id).FirstOrDefault();
                            s.FirstName = FirstName;
                            s.LastName = profile.LastName;
                            s.EmailID = profile.EmailID;
                            s.MobileNumber = profile.MobileNumber;

                            context.tblUsers.Add(s);

                            context.SaveChanges();


                    }


                }



                return View(profile);
        }

【问题讨论】：

标签： entity-framework asp.net-mvc-4 model-view-controller

【解决方案1】：

要更新数据库中的数据，请更改为以下代码。

if (Save != null)
{

    using (var context = new SYTEntities())
    {
        var s = context.tblUsers.Where(a => a.UserID == id).FirstOrDefault();
        s.FirstName = FirstName;
        s.LastName = profile.LastName;
        s.EmailID = profile.EmailID;
        s.MobileNumber = profile.MobileNumber;

        context.SaveChanges();

    }

}

从您的代码中删除 context.tblUsers.Add(s);

【讨论】：

【解决方案2】：

using (var context = new SYTEntities())
{
    var s = context.tblUsers.Where(a => a.UserID ==     id).FirstOrDefault();
    s.FirstName = FirstName;
    s.LastName = profile.LastName;
    s.EmailID = profile.EmailID;
    s.MobileNumber = profile.MobileNumber;

    // SET STATE TO CHANGED
    db.Entry(tblUsers).State = EntityState.Modified;

    context.SaveChanges();

}

【讨论】：