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>