Question

我正在解决最近在我们的sql server数据库中看到的问题。

表1有一个基于用户定义函数的计算位列，它检查另一个表中是否存在记录，如果不存在则计算结果为0.

表2是由表1的函数搜索的表。表2还使用函数检查约束，以查看表1中的位字段是否设置为1.

这似乎是一种循环依赖。问题是当将一批记录插入表2时，约束失败。逐个插入这些相同的记录允许所有插入通过。我不能为我的生活找出为什么批量插入会导致它失败。任何帮助表示赞赏。

CREATE TABLE [dbo].[tPecosPriceCheckStoreSubcategory](
    [PecosPriceCheckID] [int] NOT NULL,
    [StoreID] [int] NOT NULL,
    [SubcategoryID] [int] NOT NULL,
    [UndirectedExpectedScans] [int] NULL,
    [PriceMin] [decimal](8, 2) NULL,
    [PriceMax] [decimal](8, 2) NULL,
    [PastPriceVariancePercent] [decimal](5, 2) NULL,
    [ChangeDate] [datetime] NOT NULL,
    [IsUndirected] [bit] NOT NULL,
    [IsDirected]  AS ([dbo].[fnPecosPriceCheckStoreSubcategoryIsDirected]([PecosPriceCheckID],[SubcategoryID])),
 CONSTRAINT [PK_tPecosPriceCheckStoreSubcategory] PRIMARY KEY CLUSTERED 
(
    [PecosPriceCheckID] ASC,
    [StoreID] ASC,
    [SubcategoryID] ASC
)
ALTER TABLE [dbo].[tPecosPriceCheckStoreSubcategory] ADD  CONSTRAINT [DF_IsUndirected]  DEFAULT ((0)) FOR [IsUndirected]
GO

CREATE FUNCTION [dbo].[fnPecosPriceCheckStoreSubcategoryIsDirected]
(
   @PecosPriceCheckID int,   
   @SubcategoryID int
)
RETURNS bit
AS
BEGIN

   declare @isDirected bit
   set @isDirected = 0
   if (exists (select 1 from tPecosDirectedPriceCheckItem  where PecosPriceCheckID = @PecosPriceCheckID and SubcategoryID = @SubcategoryID ))
   begin
        set @isDirected = 1
   end
   return @isDirected  

END



CREATE TABLE [dbo].[tPecosDirectedPriceCheckItem](
    [ID] [int] IDENTITY(1,1) NOT NULL,
    [PecosPriceCheckID] [int] NOT NULL,
    [PecosItemID] [int] NOT NULL,
    [ItemSortOrder] [int] NOT NULL,
    [SubcategoryID] [int] NOT NULL,
    [ChangeDate] [datetime] NULL,
 CONSTRAINT [PK_tPecosDirectedPriceCheckItem] PRIMARY KEY CLUSTERED 
(
    [ID] ASC
)
ALTER TABLE [dbo].[tPecosDirectedPriceCheckItem]  WITH NOCHECK ADD  CONSTRAINT [CK_tPecosDirectedPriceCheckItem_CheckPriceCheckSubcategoryDirected] CHECK  (([dbo].[fnCheckDirectedItemPriceCheckSubcategory]([PecosPriceCheckID],[SubcategoryID])=(0)))
GO

ALTER TABLE [dbo].[tPecosDirectedPriceCheckItem] CHECK CONSTRAINT [CK_tPecosDirectedPriceCheckItem_CheckPriceCheckSubcategoryDirected]
GO

CREATE FUNCTION [dbo].[fnCheckDirectedItemPriceCheckSubcategory]
(
   @PriceCheckID INT,
   @SubcategoryID INT
)
RETURNS BIT
AS
BEGIN

   DECLARE @isViolation BIT

   SET @isViolation = 
   CASE WHEN EXISTS (SELECT * FROM tPecosPriceCheckStoreSubcategory WHERE SubcategoryID = @SubcategoryID AND PecosPriceCheckID = @PriceCheckID AND IsDirected = 1)
   THEN
      0
   ELSE
      1
   END   

   RETURN @isViolation

END

SQL检查约束与用户定义的函数

0 个答案: