[英]MVC ADO.NET Expects Parameter Error while inserting values
問題消息:消息“參數化查詢 '(@ProductName nvarchar(3),@SupplierID nvarchar(4000),@CategoryID' 需要參數 '@SupplierID',但未提供。”字符串
我一直在嘗試使用 MVC 操作將多個值插入到經典北風表的產品表中。 列出表格時沒有任何問題,但是當我嘗試使用腳手架創建頁面(自動生成)插入值時,它給了我上面的錯誤。
這是我的 ProductController 和 AddProduct cshtml
控制器
public class ProductController : Controller
{
public string connectionString = @"Data Source = DESKTOP-O5J7OII\SQLEXPRESS01; Initial Catalog = NORTHWND; Integrated Security = True";
//NORTHWNDEntities Kod = new NORTHWNDEntities();
//Product x = new Product();
public ActionResult Index(Product t = null)
{
DataTable tableProduct = new DataTable();
using (SqlConnection sqlCon = new SqlConnection(connectionString))
{
sqlCon.Open();
SqlDataAdapter sqlDA = new SqlDataAdapter("use NORTHWND SELECT * FROM Products Order By ProductID ASC", sqlCon);
sqlDA.Fill(tableProduct);
}
return View(tableProduct);
//var result = Kod.Products.Where(x => x.ProductID > 0).OrderBy(x => x.ProductID).ToList();
//return View(result.ToList());
}
public ActionResult AddProduct()
{
return View(new WebApplication1.Product());
}
[HttpPost]
public ActionResult AddProduct(Product productModel)
{
using (SqlConnection sqlCon = new SqlConnection(connectionString))
{
sqlCon.Open();
string query = @"INSERT INTO Products VALUES(@ProductName,@SupplierID,@CategoryID,@QuantityPerUnit,@UnitPrice,@UnitsInStock,@UnitsOnOrder,@ReorderLevel)";
SqlCommand sqlCmd = new SqlCommand(query, sqlCon);
sqlCmd.Parameters.AddWithValue("@ProductName", productModel.ProductName);
sqlCmd.Parameters.AddWithValue("@SupplierID", productModel.SupplierID);
sqlCmd.Parameters.AddWithValue("@CategoryID", productModel.CategoryID);
sqlCmd.Parameters.AddWithValue("@QuantityPerUnit", productModel.QuantityPerUnit);
sqlCmd.Parameters.AddWithValue("@UnitPrice", productModel.UnitPrice);
sqlCmd.Parameters.AddWithValue("@UnitsInStock", productModel.UnitsInStock);
sqlCmd.Parameters.AddWithValue("@UnitsOnOrder", productModel.UnitsOnOrder);
sqlCmd.Parameters.AddWithValue("@ReorderLevel", productModel.ReorderLevel);
sqlCmd.Parameters.AddWithValue("@Discontinued", productModel.Discontinued);
sqlCmd.ExecuteNonQuery();
}
return RedirectToAction("Index");
}
和 .cshtml
@model WebApplication1.Product
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>Product</h4>
<hr />
@Html.ValidationSummary(true, "", new { @class = "text-danger" })
<div class="form-group">
@Html.LabelFor(model => model.ProductName, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.ProductName, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.ProductName, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.QuantityPerUnit, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.QuantityPerUnit, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.QuantityPerUnit, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.UnitPrice, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.EditorFor(model => model.UnitPrice, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.UnitPrice, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Discontinued, htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
<div class="checkbox">
@Html.EditorFor(model => model.Discontinued)
@Html.ValidationMessageFor(model => model.Discontinued, "", new { @class = "text-danger" })
</div>
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</div>
</div>
}
<div>
@Html.ActionLink("Back to List", "Index")
</div>
謝謝你試圖幫助和回復! :)
第一個問題是您提供的參數(9)比您的查詢需要(8)更多。 @Discontinued
不是必需的。
錯誤表示未提供@SupplierID
。 這意味着它具有null
值。 檢查數據庫是否該列支持null
值。 然后將該行更改如下:
sqlCmd.Parameters.AddWithValue("@SupplierID", productModel.SupplierID ?? DBNull.Value);
?? 是空合並運算符。 建議使用存儲過程:
CREATE PROC AddProduct
@ProductName nvarchar(100),
@SupplierID int=null, /*This line inserts a DBNull, if parameter is null*/
@CategoryID int,
@QuantityPerUnit int,
@UnitPrice money,
@UnitsInStock int,
@UnitsOnOrder int,
@ReorderLevel int
BEGIN
INSERT INTO Products VALUES(@ProductName,@SupplierID,@CategoryID,@QuantityPerUnit,@UnitPrice,@UnitsInStock,@UnitsOnOrder,@ReorderLevel)
END
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