ASP.NET MVC与Sql Server交互, 插入数据

在"ASP.NET MVC与Sql Server建立连接"中，与Sql Server建立了连接。本篇实践向Sql Server中插入数据。在数据库帮助类中增加插入数据的方法。

public class SqlDB

{

protected SqlConnection conn;

//打开连接

public bool OpenConnection()

    {

conn = new SqlConnection(ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString);

try

        {

bool result = true;

if (conn.State.ToString() != "Open")

            {

conn.Open();

}

return result;

}

catch (SqlException ex)

        {

return false;

}

}

//关闭连接

public bool CloseConnection()

    {

try

        {

conn.Close();

return true;

}

catch (Exception ex)

        {

return false;

}

}

//插入数据

public int InsertData(string sql)

    {

int lastId = 0;

//string query = sql + ";SELECT @@Identity;";

try

        {

if(conn.State.ToString()=="Open")

            {

SqlCommand cmd = new SqlCommand(sql, conn);

//cmd.ExecuteNonQuery();

lastId = ToInt(cmd.ExecuteScalar());//返回第一行的第一列

}

return ToInt(lastId);

}

catch (Exception ex)

        {

return 0;

}

}

//转换成整型

private int ToInt(object o)

    {

try

        {

return int.Parse(o.ToString());

}

catch (Exception ex)

        {

return 0;

}

}

}

创建一个对应数据库Product的视图模型。

public class ProductVm

{

[Required(ErrorMessage="必填")]

[StringLength(16)]

public string Name { get; set; }

[Required(ErrorMessage = "必填")]

[StringLength(16)]

public string Quantity { get; set; }

[Required(ErrorMessage = "必填")]

[StringLength(16)]

public string Price { get; set; }

}

在TestController中增加一个处理添加数据的2个Action。

public class TestController : Controller

{

private SqlDB _db = new SqlDB();

//

// GET: /Test/

public ActionResult Index()

    {

bool r = _db.OpenConnection();

if (r)

        {

return Content("连接成功");

}

else

        {

return Content("连接失败");

}

}

public ActionResult AddProduct()

    {

return View();

}

[HttpPost]

[ValidateAntiForgeryToken]

public ActionResult AddProduct(ProductVm productVm)

    {

if(ModelState.IsValid)

        {

_db.OpenConnection();

int result = _db.InsertData("insert into Product(Name,quantity,Price) values('"+productVm.Name+"','"+productVm.Quantity+"','"+productVm.Price+"')");

if(result > 0)

            {

ModelState.AddModelError("success", "创建成功");

}

    else

            {

ModelState.AddModelError("error", "创建失败");

}

_db.CloseConnection();

    return View();

}

else

        {

return View(productVm);

}

}

}

在对应的Test/AddProduct视图中：

@model Portal.Models.ProductVm

@{

ViewBag.Title = "AddProduct";

Layout = "~/Views/Shared/_Layout.cshtml";

}

<h2>创建产品</h2>

@using (Html.BeginForm("AddProduct", "Test", new { @id = "addForm" }, FormMethod.Post))

{

@Html.AntiForgeryToken()

    <div class="form-horizontal">

        @Html.ValidationSummary(true)

        <div class="form-group">

            @Html.LabelFor(model => model.Name, new { @class = "control-label col-md-2" })

            <div class="col-md-10">

                @Html.EditorFor(model => model.Name)

                @Html.ValidationMessageFor(model => model.Name)

            </div>

        </div>

        <div class="form-group">

            @Html.LabelFor(model => model.Quantity, new { @class = "control-label col-md-2" })

            <div class="col-md-10">

                @Html.EditorFor(model => model.Quantity)

                @Html.ValidationMessageFor(model => model.Quantity)

            </div>

        </div>

        <div class="form-group">

            @Html.LabelFor(model => model.Price, new { @class = "control-label col-md-2" })

            <div class="col-md-10">

                @Html.EditorFor(model => model.Price)

                @Html.ValidationMessageFor(model => model.Price)

            </div>

        </div>

        <div class="form-group">

            <div class="col-md-offset-2 col-md-10">

                <input type="submit" value="创建" class="btn btn-default" />

            </div>

        </div>

    </div>

}

<div>

    @Html.ActionLink("Back to List", "Index")

</div>