判断表中的数据是否被其他表中使用过!!

发布: 2007-7-02 11:08 | 作者: admin | 来源: | 查看: 8次 | 进入软件测试论坛讨论

CREATE PROCEDURE dbo.SystemFuntion_HasBeUsed
@PTableName Varchar(100), --要检查数据是否被使用的主键表名称
@PKValue INT,    --主键字段的值
@IsUsed INT OUTPUT
AS

DECLARE @TableName VARCHAR(100) --外键表的名称
DECLARE @FKName VARCHAR(100) --外键字段名称
DECLARE @FKey INT

DECLARE @SQL VARCHAR(8000)

SET @sql = @#SELECT 0 as colCount into #tempTableCol UNION @#

DECLARE cursorFKTable CURSOR FOR
  SELECT b.[name] AS TableName , a.fkey
  FROM sysforeignkeys a INNER JOIN sysobjects b on a.fkeyid=b.[id] INNER JOIN sysobjects c on a.rkeyid=c.[id]
  WHERE c.[name]=@PTableName

  OPEN cursorFKTable
  FETCH NEXT FROM cursorFKTable INTO @TableName,@FKey

  WHILE @@FETCH_STATUS = 0
  BEGIN

  SELECT @FKName = a.[name] FROM syscolumns a INNER join sysobjects b ON a.[id]=b.[id] WHERE b.[name]=@TableName and @FKey=a.colid

  SET @sql = @sql + @#SELECT CASE WHEN COUNT(*)=0 THEN 0 ELSE 1 END FROM @# + @TableName +@# WHERE @# + @FKName + @#=@# + CAST(@PKValue AS VARCHAR(100))
  SET @sql = @sql + @# UNION @#

    FETCH NEXT FROM cursorFKTable INTO @TableName,@FKey
END
    CLOSE cursorFKTable
    DEALLOCATE cursorFKTable

SELECT @sql = left(@sql,len(@sql)-6)
exec(@sql)
SELECT @IsUsed = @@ROWCOUNT-1
GO

使用方法：

/***********获取当前主键值是否被其他表使用过(@HasPKValueBeUsed as HasPKValueBeUsed)*************/
DECLARE @HasPKValueBeUsed INT
EXECUTE SystemFuntion_HasBeUsed @#TLSubjectPlan@#,@SubjectPlanID,@IsUsed=@HasPKValueBeUsed OUTPUT
/*******************************************************************************/