javascript - 将行添加到 ASP.NET MVC 表时更新连接的数据库表

Question

以下代码构成了我当前正在开发的 ASP.NET MVC 应用程序的一部分。该索引创建一个表，用户可以通过在弹出模式中输入标签、服务器和频率的值来添加行(通过点击“添加”按钮激活，模式 HTML 代码未显示)。该表的初始值当前是通过从链接的 SQL 数据库表(使用 Entity Framework 创建)迁移生成的。

我正在尝试修改此代码，以便通过“添加”按钮添加的任何行都将自动添加到链接的数据库表中(最好使用 Entity Framework )。任何帮助将不胜感激。

Controller

namespace ExampleWebAppilcationTest.Controllers
{
public class HomeController : Controller
{
    ExampleDB _db = new ExampleDB();

    public ActionResult Index()
    {
        var model = _db.TData.ToList();
        return View(model);
    }

    protected override void Dispose(bool disposing)
    {
        if (_db != null)
        {
            _db.Dispose();
        }
        base.Dispose(disposing);
    }
}
}

类(class)

namespace ExampleWebAppilcationTest
{
public class ExampleDB : DbContext
{
    public DbSet<TableData> TData { get; set; }
}
}



namespace ExampleWebAppilcationTest
{
public class TableData
{
    [Key]
    public String Tag { get; set; }
    public String Server { get; set; }
    public double Frequency { get; set; }
}
}

索引

@model IEnumerable<ExampleWebAppilcationTest.TableData>

@{
ViewBag.Title = "Home Page";
}

@{
ViewBag.Title = "Index";
}

<h2>Table Data</h2>

<table class="table table-bordered" id="mainTable">
<thead>
    <tr>
        <th></th>
        <th class="thTag" scope="col">
            @Html.DisplayNameFor(model => model.Tag)
        </th>
        <th class="thServer" scope="col">
            @Html.DisplayNameFor(model => model.Server)
        </th>
        <th class="thFreq" scope="col">
            @Html.DisplayNameFor(model => model.Frequency)
        </th>
    </tr>
</thead>
        <tbody>
            <tr>
                <td colspan="5">

                        @foreach (var item in Model)
                        {
            <tr>
                <td><input type="checkbox"/></td>
                <td>
                    @Html.DisplayFor(modelItem => item.Tag)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Server)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Frequency)
                </td>
            </tr>
</tbody>
</table>

        <button type="button" id="addBtn" class="btn btn-success">Add</button>

            <!-- The Modals -->

            <script>

                var table = document.getElementById('mainTable');
                // Get the modal
                var addmodal = document.getElementById('addModal');

                // When the user clicks the button, open the modal
                btn.onclick = function () {
                    addmodal.style.display = "block";
                }

               var sbtn = document.getElementById("subBtn");
                sbtn.onclick = function () {
                    var table = document.getElementById("mainTable");
                    var tag = document.getElementById("tag").value;
                    var server = document.getElementById("server").value;
                    var frequency = document.getElementById("frequency").value;
                    var objInputCheckBox = document.createElement("input");
                    objInputCheckBox.type = "checkbox";
                    var row = table.insertRow(-1);
                    var cell1 = row.insertCell(0);
                    var cell2 = row.insertCell(1);
                    var cell3 = row.insertCell(2);
                    var cell4 = row.insertCell(3);
                    cell1.appendChild(objInputCheckBox);
                    cell2.innerHTML = tag;
                    cell3.innerHTML = server;
                    cell4.innerHTML = frequency;
                    addmodal.style.display = "none";

                }

Answer 1

尽管您的项目应该有一个分层架构，其中包含单独的业务层和数据访问层，并且 Controller 应该只是传入请求的网关 https://learn.microsoft.com/en-us/dotnet/standard/microservices-architecture/microservice-ddd-cqrs-patterns/infrastructure-persistence-layer-design )

这是您可以对当前调整执行的操作:

Controller :

namespace ExampleWebAppilcationTest.Controllers
{
    public class HomeController : Controller
    {
        [HttpGet]
        public ActionResult Index()
        {
            using (var dbContext = new ExampleDB())
            {
                var model = dbContext.TData.ToList();
                return View(model);
            }
        }

        [HttpPost]
        public ActionResult Index(TableData data)
        {
            using (var dbContext = new ExampleDB())
            {
                dbContext.TData.Add(data);
                dbContext.SaveChanges();
            }

            return RedirectToAction("Index");
        }
    }
}

数据访问

namespace ExampleWebAppilcationTest
{
public class ExampleDB : DbContext
{
    public ExampleDB() : base(nameOrConnectionString: "Your Database Connection String") { }
    public DbSet<TableData> TData { get; set; }
}
}



namespace ExampleWebAppilcationTest
{
public class TableData
{
    [Key]
    public String Tag { get; set; }
    public String Server { get; set; }
    public double Frequency { get; set; }
}
}

查看

sbtn.onclick = function () {
            var table = document.getElementById("mainTable");
            var tag = document.getElementById("tag").value;
            var server = document.getElementById("server").value;
            var frequency = document.getElementById("frequency").value;

            //Here fetch all data in a class
            var data = { Tag: tag, Server: server, Frequency: frequency };

            //make ajax call to add data
            $.ajax({
                type: "POST",
                url: '@Url.Action("Index", "Home")',     //your action
                data: data,
                dataType: 'json',
                success: function (result) {
                    //to close the popup
                },
                error: function (result) {
                    //to show error message
                }
            });
                }