实体框架数据库更新优先多重性冲突答案

【问题标题】：Entity Framework Database Update First Multiplicity conflicts实体框架数据库更新优先多重性冲突
【发布时间】：2014-01-31 12:10:04
【问题描述】：

我在这些多重性冲突中看到的大多数其他问题都是代码优先，而我要先使用 DB。我进行了一些架构更改，当我从数据库刷新模型时出现以下错误：

多重性与关系“FK_MarketSelectionWager_Bet”中角色“Bet”中的引用约束冲突。因为从属角色中的所有属性都不可为空，所以主体角色的多重性必须为“1”。

任何关于我需要做什么来修复 SQL 或我的模型的指针都会很棒。

以下是涉及的 SQL 表：

MarketSelectionWager /* 对象：表 [dbo].[MarketSelectionWager] 脚本日期：31/01/2014 12:08:34 */ 设置 ANSI_NULLS ON 去吧

SET QUOTED_IDENTIFIER ON
GO

SET ANSI_PADDING ON
GO

CREATE TABLE [dbo].[MarketSelectionWager](
    [MarketSelectionWagerIdentifier] [varchar](255) NOT NULL,
    [MarketIdentifier] [varchar](255) NULL,
    [SelectionName] [varchar](255) NULL,
    [SelectionIdentifier] [varchar](255) NULL,
    [WagerIdentifier] [varchar](255) NULL,
    [PriceType] [varchar](5) NULL,
    [PriceFrac] [varchar](50) NULL,
    [WagerStakeWin] [money] NULL,
    [WagerStakePlace] [money] NULL,
    [RunningStakeWin] [money] NULL,
    [RunningStakePlace] [money] NULL,
    [LiabilityWin] [money] NULL,
    [LiabilityPlace] [money] NULL,
    [BetIdentifier] [varchar](255) NULL,
    [BetCombinationIndex] [int] NULL,
    [WagerStatus] [int] NULL,
    [NumberRunningAfter] [int] NULL,
    [NumberRunningSameTime] [int] NULL,
    [TimeToNextRemainingRunner] [int] NULL,
    [HasOtherSelectionsRunningSameTime] [bit] NULL,
    [HasOtherSelectionsRunningAfter] [bit] NULL,
    [BetId] [int] NOT NULL,
 CONSTRAINT [PK_MarketLiabilty] PRIMARY KEY CLUSTERED 
(
    [MarketSelectionWagerIdentifier] ASC,
    [BetId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

SET ANSI_PADDING OFF
GO

ALTER TABLE [dbo].[MarketSelectionWager]  WITH CHECK ADD  CONSTRAINT [FK_MarketSelectionWager_Bet] FOREIGN KEY([BetId])
REFERENCES [dbo].[Bet] ([BetID])
ON DELETE CASCADE
GO

ALTER TABLE [dbo].[MarketSelectionWager] CHECK CONSTRAINT [FK_MarketSelectionWager_Bet]
GO

下注

/****** Object:  Table [dbo].[Bet]    Script Date: 31/01/2014 12:09:19 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[Bet](
    [BetID] [int] IDENTITY(1,1) NOT NULL,
    [BetSlipID] [int] NOT NULL,
    [BetPayout] [money] NULL,
    [BetPotentialReturn] [money] NULL,
    [BetStake] [money] NULL,
    [BetRefund] [money] NULL,
    [DateBetSettled] [datetime] NULL,
    [SettleStatusID] [int] NULL,
    [SportID] [int] NULL,
    [tsTimestamp] [timestamp] NULL,
    [SportMixID] [int] NULL,
    [WagerTypeMixID] [int] NULL,
    [EventMixID] [int] NULL,
    [MarketMixID] [int] NULL,
    [SettleTypeID] [int] NULL,
    [MaxOffDate] [datetime] NULL,
 CONSTRAINT [PK_Bet] PRIMARY KEY CLUSTERED 
(
    [BetID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

ALTER TABLE [dbo].[Bet] ADD  CONSTRAINT [DF_BS_Bet_BetPayout]  DEFAULT ((0)) FOR [BetPayout]
GO

ALTER TABLE [dbo].[Bet] ADD  CONSTRAINT [DF_BS_Bet_BetPotentialReturn]  DEFAULT ((0)) FOR [BetPotentialReturn]
GO

ALTER TABLE [dbo].[Bet] ADD  CONSTRAINT [DF_BS_Bet_BetStake]  DEFAULT ((0)) FOR [BetStake]
GO

ALTER TABLE [dbo].[Bet] ADD  CONSTRAINT [DF_BS_Bet_BetRefund]  DEFAULT ((0)) FOR [BetRefund]
GO

ALTER TABLE [dbo].[Bet]  WITH CHECK ADD  CONSTRAINT [FK_Bet_BetSlip] FOREIGN KEY([BetSlipID])
REFERENCES [dbo].[BetSlip] ([BetSlipId])
ON DELETE CASCADE
GO

ALTER TABLE [dbo].[Bet] CHECK CONSTRAINT [FK_Bet_BetSlip]
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnHidden', @value=0 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetID'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnOrder', @value=1 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetID'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnWidth', @value=-1 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetID'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnHidden', @value=0 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetSlipID'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnOrder', @value=0 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetSlipID'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnWidth', @value=-1 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetSlipID'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnHidden', @value=0 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetPayout'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnOrder', @value=0 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetPayout'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnWidth', @value=-1 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetPayout'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnHidden', @value=0 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetPotentialReturn'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnOrder', @value=0 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetPotentialReturn'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnWidth', @value=2250 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetPotentialReturn'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnHidden', @value=0 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetStake'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnOrder', @value=0 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetStake'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnWidth', @value=-1 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetStake'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnHidden', @value=0 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetRefund'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnOrder', @value=0 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetRefund'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnWidth', @value=-1 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'BetRefund'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnHidden', @value=0 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'DateBetSettled'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnOrder', @value=0 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'DateBetSettled'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_ColumnWidth', @value=-1 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet', @level2type=N'COLUMN',@level2name=N'DateBetSettled'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_DefaultView', @value=0x02 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Filter', @value=NULL , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_LinkChildFields', @value=N'BetID' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_LinkMasterFields', @value=N'BetID' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_OrderBy', @value=NULL , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_OrderByOn', @value=0 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_Orientation', @value=0x00 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_SubdatasheetName', @value=N'dbo.BS_Selection' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet'
GO

EXEC sys.sp_addextendedproperty @name=N'MS_TableMaxRecords', @value=10000 , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Bet'
GO

【问题讨论】：

我打赌你改了[BetId] [int] NOT NULL（不为空）？
@GertArnold 但我不希望在marketselectionwager 表上允许有空值（EF 模型不能处理）原因是它是复合主键的一部分吗？
你在 sql 中没有任何需要修复的东西，问题出在你的 edmx 或 fluent 映射中，视情况而定。
@Mathew，我只是在使用向导来刷新我的 edmx 模型。它似乎无法应付，你知道我会在那里解决什么吗？
当然，我只问这是否是您的更改之一，因为我自己注意到 EF 在收集此类更新时不会更改其概念模型（类模型）中的多重性。您可以在关联的属性中手动更改多重性。

标签： c# sql entity-framework

【解决方案1】：

当实体框架从数据库更新模型时，它会做和不做的事情。它添加了新的对象、字段和关联等等（我认为只有 EF 团队才能提供详尽的列表）。我体验过它不会更新概念模型中的多重性约束。

因此，当您将NOT NULL 约束添加到数据库中的列（在您的情况下为BetId）时，存储模型将被更新，但概念模型 em>（类模型）将保留初始可为空的关联（0..1 - n）。你会注意到模型不再通过验证，看起来很可怕（毕竟，你只是更新了），但修复很简单：在 edmx 设计器中，手动更改“1”侧的多重性关联，所以它变成1-n。

【讨论】：