UPDATE语句与ASP.NET MVC4中的FOREIGN KEY约束冲突

Question

我实际上在使用ASP.NET MVC4应用程序,我们使用实体框架和模型 - 视图 - 视图 - 模型方法和7层架构.我们有一个页面需要插入或更新"产品"信息.插入或更新的产品数据将保存在"产品"表中.我的数据库名称是"DbOnix".产品表的基本结构如下:

 Column Name               Data Type      Allow Nulls
ProductID PK                  int           
ProductName                varchar(255)       NO
ProductCategoryID FK          int             
Sequence                      int             YES
ActiveStatus                  int             YES
SlNo                          int             NO

Product表中的ProductCategoryID列与ProductCategory表具有外键关系.ProductCategory表的基本结构:

    Column Name                Data Type          Allow Nulls
 ProductCategoryID PK             int                          
 ProductCategoryName            varchar(150)          NO

每当我尝试在Product表中插入或更新数据时,都会抛出以下异常:

The UPDATE statement conflicted with the FOREIGN KEY constraint   "FK_Product_ProductCategory". The conflict occurred in database "DbOnix", table "dbo.ProductCategory", column 'ProductCategoryID'.The statement has been terminated.

我的控制器代码:

    public HttpStatusCodeResult UpdateProductInformation(int id, ProductDTO ProductDTO)
    {
        _productManager.UpdateProductInformation(id, ProductDTO);
        return new HttpStatusCodeResult(HttpStatusCode.OK);
    }

我的经理班级代码:

    public void UpdateProductInformation(int id, ProductDTO productDTO)
    {
        //if productDTO data is not valid
        if (productDTO == null)
            throw new  ArgumentException(Messages.warning_CannotAddProfileWithNullInformation);

        //Create a new product entity
        var currentProduct = _ProductRepository.Get(id);

        var updatedProduct = new Product();
        updatedProduct.ProductID = id;
        updatedProduct.ProductName = productDTO.ProductName;
        updatedProduct.ProductCategoryID = productDTO.ProductCategoryID;
        updatedProduct.Sequence = productDTO.Sequence;
        updatedProduct.ActiveStatus = productDTO.ActiveStatus;
        updatedProduct.SlNo = productDTO.SlNo;

        //Update Product
        updatedProduct = this.UpdateProduct(currentProduct, updatedProduct);

    }

我的核心(属性)类代码:

public partial class Product : Entity, IValidatableObject
{


    public Product()
    {

    }


    [Key]
    public int ProductID { get; set; }
    public string ProductName { get; set; }
    public int ProductCategoryID { get; set; }
    public int Sequence { get; set; }
    public int ActiveStatus { get; set; }
    public int SlNo { get; set; }
}

和我的DTO课程代码:

public class ProductDTO
{
    public int ProductID { get; set; }
    public string ProductName { get; set; }
    public int ProductCategoryID { get; set; }
    public int Sequence { get; set; }
    public int ActiveStatus { get; set; }
    public int SlNo { get; set; }
}

请注意,我的数据库服务器是MS SQL Server 2008 R2.

编辑1:我忘了包含我的Javascript代码:

$(function () {



var Product = function (Product) {
    var self = this;
    self.ProductID = ko.observable(Product ? Product.ProductID : 0).extend({ required: true });
    self.ProductName = ko.observable(Product ? Product.ProductName : '').extend({ required: true });
    self.ActiveStatus = ko.observable(Product ? Product.ActiveStatus : 0);

};

var ProductCollection = function () {
    var self = this;

    //if ProfileId is 0, It means Create new Profile
    if (ProductID == 0) {
        self.Product = ko.observable(new Product());
    }
    else {
        $.ajax({
            url: urlProduct + '/GetProductById/' + ProductID,
            async: false,
            dataType: 'json',
            success: function (json) {
                self.Product = ko.observable(new Product(json));
            }
        });
    }

    self.ProductErrors = ko.validation.group(self.Product());





    self.saveProduct = function () {
        var isValid = true;

        if (self.ProductErrors().length != 0) {
            self.ProductErrors.showAllMessages();
            isValid = false;
        }



        if (isValid) {

            self.Product().ActiveStatus = document.getElementById("stat").value;

            $.ajax({
                type: (ProductID > 0 ? 'PUT' : 'POST'),
                cache: false,
                dataType: 'json',
                url: urlProduct + (ProductID > 0 ? '/UpdateProductInformation?id=' + ProductID : '/SaveProductInformation'),
                data: JSON.stringify(ko.toJS(self.Product())),
                contentType: 'application/json; charset=utf-8',
                async: false,
                success: function (data) {
                    alert("Product saved successfully.");
                    window.location.href = '/Product';
                },
                error: function (err) {
                    var err = JSON.parse(err.responseText);
                    var errors = "";
                    for (var key in err) {
                        if (err.hasOwnProperty(key)) {
                            errors += key.replace("Product.", "") + " : " + err[key];
                        }
                    }
                    $("<div></div>").html(errors).dialog({ modal: true, title: JSON.parse(err.responseText).Message, buttons: { "Ok": function () { $(this).dialog("close"); } } }).show();
                },
                complete: function () {
                }
            });
        }
    };
};


var ProductsViewModel = function () {
    var self = this;
    var url = "/Product/GetAllProduct";
    var refresh = function () {
        $.getJSON(url, {}, function (data) {
            self.Products(data);
        });
    };

    // Public data properties
    self.Products = ko.observableArray([]);

    // Public operations
    self.createProduct = function () {
        window.location.href = '/Product/ProductCreateEdit/0';
    };

    self.editProduct = function (product) {
        //alert(product.ProductID);
        window.location.href = '/Product/ProductCreateEdit/' + product.ProductID;
    };

};

    ko.applyBindings(new ProductsViewModel(), document.getElementById("productlist"));
    ko.applyBindings(new ProductCollection(), document.getElementById("product_edit"));
});

请注意,我使用了KnockoutJS v2.3.0

Answer 1

在你的代码..

updatedProduct.ProductCategoryID = productDTO.ProductCategoryID;

您可能正在分配ProductCategory表中不存在的值(ProductCategoryID) .因此,请检查您是否从数据库中获取了正确的ProductCategories(检查productDTO).问题可能是您的ProductCategoryID的值为0.这就是它说的原因UPDATE statement conflicted with the FOREIGN KEY constraint