Question

下表在SQL中工作，我的意思是我可以添加行，如果有重复，它会提示我无法插入。尝试在Entity Framework中插入时，数据确实会添加到本地存储中，命令为：

 tblOrderDetail ord = new tblOrderDetail();
                        ord.FK_ServiceID = cboService.ToSelectedIntValue();
                        ord.FK_QuoteID = primKey;
                        ord.Quantity = txtServiceQuant.ToInt();
                        ord.LineTotal = txtServiceQuant.ToInt() * txtServiceUnit.ToDecimal();                      
contx.tblOrderDetails.Add(ord);

如果我尝试保存更改，如下所示，如果它是一个独特的行，一切都很完美。此外，如果我尝试保存已存在的行，我会得到预期的唯一约束错误。

在此之后，如果我尝试插入另一个唯一的订单详细信息行，我会得到一个未提交给DB的PREVIOUS行的唯一约束错误。

这是因为本地商店还有副本吗？或者我错过了什么？

contx.SaveChanges();

保存更改时发生以下错误：

CREATE TABLE [dbo].[tblOrderDetail](
    [PK_OrderDetailID] [int] IDENTITY(1,1) Primary Key NOT NULL,
    [FK_ServiceID] [int] NULL,
    [FK_ProductID] [int] NULL,
    [FK_QuoteID] [int] NULL,
    [FK_InvoiceID] [int] NULL,
    [Quantity] [money] NOT NULL,
    [LineTotal] [money] NOT NULL,
    [Deleted] [bit] NULL,
 CONSTRAINT [uc_InvoiceQuoteProductService] UNIQUE NONCLUSTERED 
(
    [FK_InvoiceID] ASC,
    [FK_QuoteID] ASC,
    [FK_ServiceID] ASC,
    [FK_ProductID] ASC
))
GO
    Go

ALTER TABLE [dbo].[tblOrderDetail] ADD  CONSTRAINT [DF_tblOrderDetail_Deleted]  DEFAULT ((0)) FOR [Deleted]
GO

ALTER TABLE [dbo].[tblOrderDetail]  WITH CHECK ADD FOREIGN KEY([FK_InvoiceID])
REFERENCES [dbo].[tblInvoice] ([PK_InvoiceID])
GO

ALTER TABLE [dbo].[tblOrderDetail]  WITH CHECK ADD FOREIGN KEY([FK_QuoteID])
REFERENCES [dbo].[tblQuote] ([PK_QuoteID])
GO

ALTER TABLE [dbo].[tblOrderDetail]  WITH CHECK ADD FOREIGN KEY([FK_ServiceID])
REFERENCES [dbo].[tblService] ([PK_ServiceID])
GO


SET IDENTITY_INSERT [dbo].[tblOrderDetail] ON 
INSERT [dbo].[tblOrderDetail] ([PK_OrderDetailID], [FK_ServiceID], [FK_ProductID], [FK_QuoteID], [FK_InvoiceID], [Quantity], [LineTotal], [Deleted]) VALUES (1,1, NULL, 1, NULL, 12.0000, 3000.0000, NULL)
INSERT [dbo].[tblOrderDetail] ([PK_OrderDetailID], [FK_ServiceID], [FK_ProductID], [FK_QuoteID], [FK_InvoiceID], [Quantity], [LineTotal], [Deleted]) VALUES (2,2, NULL, 2, NULL, 1.0000, 300.0000, NULL)
INSERT [dbo].[tblOrderDetail] ([PK_OrderDetailID], [FK_ServiceID], [FK_ProductID], [FK_QuoteID], [FK_InvoiceID], [Quantity], [LineTotal], [Deleted]) VALUES (3,3, NULL, 5, NULL, 4.0000, 600.0000, NULL)
INSERT [dbo].[tblOrderDetail] ([PK_OrderDetailID], [FK_ServiceID], [FK_ProductID], [FK_QuoteID], [FK_InvoiceID], [Quantity], [LineTotal], [Deleted]) VALUES (4,4, NULL, 5, NULL, 8.0000, 4000.0000, NULL)
INSERT [dbo].[tblOrderDetail] ([PK_OrderDetailID], [FK_ServiceID], [FK_ProductID], [FK_QuoteID], [FK_InvoiceID], [Quantity], [LineTotal], [Deleted]) VALUES (5,5, NULL, 5, NULL, 6.0000, 2700.0000, NULL)
SET IDENTITY_INSERT [dbo].[tblOrderDetail] OFF

内在消息如下：

{“违反UNIQUE KEY约束'uc_InvoiceQuoteProductService'。无法在对象'dbo.tblOrderDetail'中插入重复键。重复键值为（，4,2，）。\ r \ n语句已终止。”}

堆栈跟踪：

   at System.Data.Entity.Internal.InternalContext.SaveChanges()
   at System.Data.Entity.Internal.LazyInternalContext.SaveChanges()
   at System.Data.Entity.DbContext.SaveChanges()
   at WWITIQ.PresentationLayer.Windows.pgeQuotes.btnAddServices_Click_1(Object sender, RoutedEventArgs e) in c:\Users\...

Answer 1

如果您仍然在＆＃34;同一＆＃34;上下文，在尝试再次保存之前，您必须首先将有问题的实体从上下文中分离出来。

如果您没有，它仍将附加到上下文中，SaveChanges将应用于所有附加实体。

所以尝试做类似的事情：

contx.Entry(<theEntityWhichBreaksUnicityConstraint>).State = EntityState.Detached;

不评估Entity.Add的唯一约束

1 个答案: