在數據庫Asp.Net MVC中插入值

Question

我有一個列的產品表Product_Id(pk), Name, Price, description, CategoryId, SubCategoryId, SubSubCategoryId

以及另一個帶有CategoryId(pk), CategoryName, ParentId列的Category表。

以及另一個具有列ProductAttributeValueId(pk), ProductId(fk), Size, Quantity表ProductAttributesValues

我的類別表中有這些數據：

CategoryId | CategoryName | ParentId
    1      |   Clothing   |   NULL
    2      |   Computing  |   NULL
    3      |     Books    |   NULL
    4      |    Men's     |   1
    5      |    Women's   |   1
    6      |     Kid's    |   1
    7      |    Laptops   |   2
    8      |   Desktops   |   2
    9      |    Shirts    |   4
    10     |     Tops     |   5
    11     |   Macbooks   |   7
    11     |  Ultrabooks  |   7

如您所見，具有NULL值的Category為Parent，其他為子級，依此類推。 像： 類別服裝> 子類別男士> SubSubCategory襯衫

產品.cs

public partial class Product
{
    public int ProductId { get; set; }
    public int CategoryId { get; set; }
    public int SubCategoryId { get; set; }
    public int SubSubCategoryId { get; set; }
    [Required]
    [StringLength(50)]
    public string Name { get; set; }
    [AllowHtml]
    public string Description { get; set; }
    public decimal? Price { get; set; }
}

ProductAttributeValues.cs

public partial class ProductAttributeValues
{
    public int ProductAttributeValueId { get; set; }
    public int ProductId { get; set; }
    public string Size {get; set; }
    public int Quantity { get; set; }
}

視圖模型

public class ProductAttributesViewModel
{
    public int ProductId { get; set; }
    public int? CategoryId { get; set; }
    public int? SubCategoryId { get; set; }
    public int? SubSubCategoryId { get; set; }
    [Required]
    [StringLength(50)]
    public string Name { get; set; }
    [AllowHtml]
    public string Description { get; set; }
    public decimal? Price { get; set; }
    public int? Quantity { get; set; }
    public string Sizes { get; set; }
    public int Stock { get; set; }
    public Product Product { get; set; }
    public Category Category { get; set; }
}

控制者

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult AddProduct(ProductAttributesViewModel newRecord)
    {
      IEnumerable<SelectListItem> categories = db.Categories.Where(w => w.ParentId == null).Select(c => new SelectListItem
        {
            Value = c.CategoryId.ToString(),
            Text = c.Name
        });
        ViewBag.CategoryId = categories;

                   var product = new Product
                    {
                        Name = newRecord.Name,
                        CategoryId = newRecord.CategoryId,
                        SubCategoryId = newRecord.SubCategoryId,
                        SubSubCategoryId = newRecord.SubSubCategoryId,
                        Description = newRecord.Description,
                        Price = newRecord.Price,
                        Quantity = newRecord.Quantity
                    };

                    var productattributevalues = new ProductAttributeValue
                    {
                        ProductId = newRecord.ProductId,
                        Size = newRecord.Size
                        Quantity = newRecord.Stock
                    };
                    db.Products.Add(product);
                    db.ProductAttributeValues.Add(productattributevalues);
                    db.SaveChanges();
                    return RedirectToAction("Index", "Home");
     }

視圖

@model ProjectABC.ViewModels.ProductAttributesViewModel

@using (Html.BeginForm("AddProduct", "Store", FormMethod.Post, new { enctype = "multipart/form-data", @class = "form-horizontal col-md-12", role = "form" }))
{
<div class="form-group">
    @Html.LabelFor(m => m.Name, new { @class = "col-md-2 control-label", data_val_required = "required" })
    <div class="col-md-10">
        @Html.TextBoxFor(m => m.Name, new { @class = "form-control" })
    </div>
</div>
<div class="form-group">
    @Html.LabelFor(m => m.Description, new { @class = "col-md-2 control-label" })
    <div class="col-md-10">
        @Html.TextAreaFor(m => m.Description, new { @class = "form-control" })
    </div>
</div>
<div class="form-group">
    @Html.LabelFor(m => m.CategoryId, new { @class = "col-md-2 control-label" })
    <div class="col-md-10">
        @Html.DropDownList("CategoryId", null, String.Empty, new {onchange="jsFunction(this.value);", @class = "col-xs-8 control-label CssCategory" })
    </div>
</div>
<div class="form-group">
    @Html.LabelFor(m => m.SubCategoryId, new { @class = "col-md-2 control-label" })
    <div class="col-md-10">

        @Html.DropDownList("CategoryId", null, String.Empty, new { @class = "col-xs-8 control-label" })
    </div>
</div>

<div class="form-group">
    @Html.LabelFor(m => m.SubSubCategoryId, new { @class = "col-md-2 control-label" })
    <div class="col-md-10">
        @Html.DropDownList("CategoryId", null, String.Empty, new { @class = "col-xs-8 control-label CssSubSubCategory" })
    </div>
</div>
<div class="form-group">
            @Html.LabelFor(m => m.Price, new { @class = "col-md-2 control-label" })
            <div class="col-md-10">
                @Html.TextBoxFor(x => x.Price, new { @class = "form-control" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(m => m.Quantity, new { @class = "col-md-2 control-label" })
            <div class="col-md-10">
                @Html.TextBoxFor(x => x.Quantity, new { @class = "form-control" })
            </div>
        </div>
<div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" class="btn btn-default" value="Create Product" />
            </div>
        </div>
   }

問題

來自字段的所有值都成功插入到Product和ProductAttributesValues表中，但是在product表中只有SubCategoryId和SubSubCategoryId為NULL。 我已經在“產品”表中創建了這些子類別和子類別列，因此可以執行“搜索”。

我已經為類別，子類別和子子類別填充了3個下拉列表，當我選擇任何類別時，使用此類別會彈出CategoryId

<script type="text/javascript">
function jsFunction(value) {
    alert(value);
}

但不在產品表中存儲subcategoryId和subsubcategoryId值。 除這兩個字段外，所有剩余字段均被存儲。

Answer 1

這是因為您對它們兩個都使用了相同的SELECT HTML標記元素。

問題在於@Html.DropDownList("CategoryId"對於他們兩個應該是不同的。

<div class="form-group">
    @Html.LabelFor(m => m.SubCategoryId, new { @class = "col-md-2 control-label" })
    <div class="col-md-10">

        @Html.DropDownList("CategoryId", null, String.Empty, new { @class = "col-xs-8 control-label" })
    </div>
</div>

<div class="form-group">
    @Html.LabelFor(m => m.SubSubCategoryId, new { @class = "col-md-2 control-label" })
    <div class="col-md-10">
        @Html.DropDownList("CategoryId", null, String.Empty, new { @class = "col-xs-8 control-label CssSubSubCategory" })
    </div>
</div>

應該：

<div class="form-group">
    @Html.LabelFor(m => m.SubCategoryId, new { @class = "col-md-2 control-label" })
    <div class="col-md-10">    
        @Html.DropDownList("SubCategoryId", null, String.Empty, new { @class = "col-xs-8 control-label" })
    </div>
</div>

<div class="form-group">
    @Html.LabelFor(m => m.SubSubCategoryId, new { @class = "col-md-2 control-label" })
    <div class="col-md-10">
        @Html.DropDownList("SubSubCategoryId", null, String.Empty, new { @class = "col-xs-8 control-label CssSubSubCategory" })
    </div>
</div>

Answer 2

首先從控制器生成子類別和子子類別的選擇列表：

ViewBag.SubCategoryId= db.Categories.Where(w => w.ParentId == null).Select(c => new SelectListItem { Value = c.SubCategoryId.ToString(), Text = c.Name }); ViewBag.SubSubCategoryId= db.Categories.Where(w => w.ParentId == null).Select(c => new SelectListItem { Value = c.SubSubCategoryId.ToString(), Text = c.Name });

然后按照@Orel Eraki的回答。