判断表中的数据是否被其他表中使用过!!

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
/*******************************************************************************/

原文转自：http://www.ltesting.net