Question

在为我的两个表（字符）和（派系）创建FOREIGN KEY时遇到问题。

让我解释一下情况：

一个角色通常有一个派系但有些可以有2个，所以（角色）表格有两列[Faction1]和[Faction2]都必须与（Factions）表相关。所以我制作了一个FOREIGN KEY（FK_Charachters（1）_Factions）在删除时设置为空级联更新

当我尝试制作FOREIGN KEY（FK_Charachters（2）_Factions），它将使用[Faction2]列而不是[Faction1]作为前一个键，并且在删除时设置为空级联更新

我收到错误消息：

“无法创建关系'FK_Characters（2）_Factions'。
在表'字符'上引入FOREIGN KEY约束'FK_Characters（2）_Factions'可能会导致循环或多个级联路径。指定ON DELETE NO ACTION或ON UPDATE NO ACTION，或修改其他FOREIGN KEY约束。“

当然，当我设置ON DELETE NO ACTION并且ON UPDATE NO ACTION一切正常但这将阻止派系的任何更新。

我可以做些什么来强制执行这2个FOREIGN KEY？

〜TIA〜（人物）表

    USE [HDA]
    GO

    /****** Object:  Table [dbo].[Characters]    Script Date: 05/15/2014 02:38:19 ******/
    SET ANSI_NULLS ON
    GO

    SET QUOTED_IDENTIFIER ON
    GO

    CREATE TABLE [dbo].[Characters](
        [ID] [smallint] IDENTITY(1,1) NOT NULL,
        [CODE] [nvarchar](5) NULL,
        [Name] [nvarchar](50) NULL,
        [NameID] [smallint] NULL,
        [Tier] [tinyint] NULL,
        [Grp1] [tinyint] NULL,
        [Grp2] [tinyint] NULL,
        [Rarity] [tinyint] NULL,
        [Fac1] [tinyint] NULL,
        [Fac2] [tinyint] NULL,
        [Speciality] [tinyint] NULL,
        [MaxLevel] [smallint] NULL,
        [Power] [smallint] NULL,
        [HP] [smallint] NULL,
        [Speed] [tinyint] NULL,
        [Attack] [nvarchar](20) NULL,
        [AttackDesc] [nvarchar](10) NULL,
        [PowerPerLevel] [tinyint] NULL,
        [HPPerLevel] [tinyint] NULL,
        [TS] [timestamp] NULL,
        [CreationDate] [datetime2](7) NOT NULL,
     CONSTRAINT [PK_Characters] PRIMARY KEY CLUSTERED 
    (
        [ID] 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].[Characters]  WITH CHECK ADD  CONSTRAINT [FK_Characters_AttackDescription] FOREIGN KEY([AttackDesc])
    REFERENCES [dbo].[AttackDescription] ([ID])
    GO

    ALTER TABLE [dbo].[Characters] CHECK CONSTRAINT [FK_Characters_AttackDescription]
    GO

    ALTER TABLE [dbo].[Characters]  WITH CHECK ADD  CONSTRAINT [FK_Characters_CharactersName] FOREIGN KEY([NameID])
    REFERENCES [dbo].[CharactersName] ([ID])
    ON UPDATE CASCADE
    ON DELETE SET NULL
    GO

    ALTER TABLE [dbo].[Characters] CHECK CONSTRAINT [FK_Characters_CharactersName]
    GO

    ALTER TABLE [dbo].[Characters]  WITH CHECK ADD  CONSTRAINT [FK_Characters_Rarity] FOREIGN KEY([Rarity])
    REFERENCES [dbo].[Rarity] ([ID])
    ON UPDATE CASCADE
    ON DELETE SET NULL
    GO

    ALTER TABLE [dbo].[Characters] CHECK CONSTRAINT [FK_Characters_Rarity]
    GO

    ALTER TABLE [dbo].[Characters] ADD  CONSTRAINT [DF__Character__Creat__395884C4]  DEFAULT (sysdatetime()) FOR [CreationDate]
    GO

（派系）表

        USE [HDA]
    GO

    /****** Object:  Table [dbo].[Factions]    Script Date: 05/15/2014 02:42:16 ******/
    SET ANSI_NULLS ON
    GO

    SET QUOTED_IDENTIFIER ON
    GO

    CREATE TABLE [dbo].[Factions](
        [ID] [tinyint] NOT NULL,
        [Color] [nvarchar](5) NOT NULL,
        [Description] [ntext] NULL,
        [TS] [timestamp] NULL,
        [CreationDate] [datetime2](7) NOT NULL,
     CONSTRAINT [PK_Factions] PRIMARY KEY CLUSTERED 
    (
        [ID] ASC
    )WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
    ) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

    GO

    ALTER TABLE [dbo].[Factions] ADD  CONSTRAINT [DF__Factions__Creati__4D5F7D71]  DEFAULT (sysdatetime()) FOR [CreationDate]
    GO

2 FOREIGN KEYS到同一个PRIMARY KEY

0 个答案: