ASP.NET MVC与Sql Server交互,把字典数据插入数据库

在"ASP.NET MVC与Sql Server交互, 插入数据"中，在Controller中拼接sql语句。比如：

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

在某些场景中需要把数据放在字典集合中，再插入到数据库。类似如下：

_db.InsertDataByDic("表名", 字典集合);

这样有更好的可读性。字典集合的键是表的字段们。

于是，可以把相对复杂的sql语句拼接放在了帮助类中。在帮助类中增加一个InsertDataByDic方法，该方法遍历字典集合拼接sql语句。

     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;

            }

        }


        //插入字典数据

        public int InsertDataByDic(string tableName, Dictionary<string,string> dics)

        {

            int lastId = 0;

            string keyStr = string.Empty;//拼接键

            string valStr = string.Empty;//拼接变量

            int index = 0;//索引

            try

            {

                foreach (KeyValuePair<string, string> item in dics)

                {

                    index++;

                    //第一次拼接前面逗号

                    keyStr += (index != 1 ? "," : "") + "[" + item.Key + "]";

                    valStr += (index != 1 ? "," : "") + "@" + item.Key;

                }


                //拼接sql语句

                string query = "insert into " + tableName + "(" + keyStr + ") values (" + valStr + ");SELECT @@Identity;";

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

                {

                    SqlCommand cmd = new SqlCommand(query, conn);

                    foreach (KeyValuePair<string, string> item in dics)

                    {

                        cmd.Parameters.AddWithValue("@" + item.Key, item.Value);

                    }

                    lastId = ToInt(cmd.ExecuteScalar());

                }

                return ToInt(lastId);

            }

            catch (Exception ex)

            {

                return 0;

            }

        }

    }

在TestController中增加2个名称为AddProductByDic的Action方法，把从前端获取到的视图模型中的数据赋值给字典集合。

  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");

            }

        }


        //通过sql语句插入数据

        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 RedirectToAction("Index");

            }

            else

            {

                return View(productVm);

            }

        }


        //通过字典集合插入数据

        public ActionResult AddProductByDic()

        {

            return View();

        }


        [HttpPost]

        [ValidateAntiForgeryToken]

        public ActionResult AddProductByDic(ProductVm productVm)

        {

            int i = 0;

            if (ModelState.IsValid)

            {

                _db.OpenConnection();

                Dictionary<string, string> data = new Dictionary<string, string>();

                data["Name"] = productVm.Name;

                data["quantity"] = productVm.Quantity;

                data["Price"] = productVm.Price;

                i = _db.InsertDataByDic("Product", data);

                _db.CloseConnection();


                if(i>0)

                {

                    return RedirectToAction("Index");

                }

                else

                {

                    return View(productVm);

                }

            }

            else

            {

                return View(productVm);

            }

        }

    }

AddProductByDic.cshtml是一个强类型视图。

@model Portal.Models.ProductVm


@{

    ViewBag.Title = "AddProductByDic";

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

}


<h2>AddProductByDic</h2>


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

{

    @Html.AntiForgeryToken()


    <div class="form-horizontal">

        <h4>ProductVm</h4>

        <hr />

        @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>