Question

我需要创建一个存储过程：

接受表名作为参数
查找其依赖项（FK）
删除它们
截断表格

到目前为止，我基于http://www.mssqltips.com/sqlservertip/1376/disable-enable-drop-and-recreate-sql-server-foreign-keys/创建了以下内容。我的问题是以下脚本成功执行1和2并生成查询以更改表但实际上并不执行它们。换句话说，如何执行生成的“Alter Table ...”查询以实际删除FK？

CREATE PROCEDURE DropDependencies(@TableName VARCHAR(50))
AS
BEGIN
SELECT 'ALTER TABLE ' + OBJECT_SCHEMA_NAME(parent_object_id) + '.[' + OBJECT_NAME(parent_object_id) + '] DROP CONSTRAINT ' + name
FROM sys.foreign_keys WHERE referenced_object_id=object_id(@TableName)
END



EXEC DropDependencies 'TableName'

任何想法都表示赞赏！

更新：我将光标添加到SP但我仍然得到并且错误： “消息203，级别16，状态2，过程DropRestoreDependencies，第75行名称'ALTER TABLE [dbo]。[ChildTable] DROP CONSTRAINT [FK__ChileTable__ParentTable__745C7C5D]'不是有效的标识符。“

这是更新后的SP： CREATE PROCEDURE DropRestoreDependencies（@schemaName sysname，@ tableName sysname）如开始设置NOCOUNT

DECLARE @operation VARCHAR(10)  


SET @operation = 'DROP' --ENABLE, DISABLE, DROP  


DECLARE @cmd NVARCHAR(1000) 

DECLARE   
   @FK_NAME sysname,  
   @FK_OBJECTID INT,  
   @FK_DISABLED INT,  
   @FK_NOT_FOR_REPLICATION INT,  
   @DELETE_RULE    smallint,     
   @UPDATE_RULE    smallint,     
   @FKTABLE_NAME sysname,  
   @FKTABLE_OWNER sysname,  
   @PKTABLE_NAME sysname,  
   @PKTABLE_OWNER sysname,  
   @FKCOLUMN_NAME sysname,  
   @PKCOLUMN_NAME sysname,  
   @CONSTRAINT_COLID INT  


DECLARE cursor_fkeys CURSOR FOR   
   SELECT  Fk.name,  
           Fk.OBJECT_ID,   
           Fk.is_disabled,   
           Fk.is_not_for_replication,   
           Fk.delete_referential_action,   
           Fk.update_referential_action,   
           OBJECT_NAME(Fk.parent_object_id) AS Fk_table_name,   
           schema_name(Fk.schema_id) AS Fk_table_schema,   
           TbR.name AS Pk_table_name,   
           schema_name(TbR.schema_id) Pk_table_schema  
   FROM    sys.foreign_keys Fk LEFT OUTER JOIN   
           sys.tables TbR ON TbR.OBJECT_ID = Fk.referenced_object_id --inner join   
   WHERE   TbR.name = @tableName  
           AND schema_name(TbR.schema_id) = @schemaName  

OPEN cursor_fkeys  

FETCH NEXT FROM   cursor_fkeys   
   INTO @FK_NAME,@FK_OBJECTID,  
       @FK_DISABLED,  
       @FK_NOT_FOR_REPLICATION,  
       @DELETE_RULE,     
       @UPDATE_RULE,     
       @FKTABLE_NAME,  
       @FKTABLE_OWNER,  
       @PKTABLE_NAME,  
       @PKTABLE_OWNER  

WHILE @@FETCH_STATUS = 0   
BEGIN   

   -- create statement for dropping FK and also for recreating FK  
   IF @operation = 'DROP'  
   BEGIN  

       -- drop statement  
       SET @cmd = 'ALTER TABLE [' + @FKTABLE_OWNER + '].[' + @FKTABLE_NAME   
       + ']  DROP CONSTRAINT [' + @FK_NAME + ']'     

      EXEC @cmd  

       -- create process  
       DECLARE @FKCOLUMNS VARCHAR(1000), @PKCOLUMNS VARCHAR(1000), @COUNTER INT  

       -- create cursor to get FK columns  
       DECLARE cursor_fkeyCols CURSOR FOR   
       SELECT  COL_NAME(Fk.parent_object_id, Fk_Cl.parent_column_id) AS Fk_col_name,   
               COL_NAME(Fk.referenced_object_id, Fk_Cl.referenced_column_id) AS Pk_col_name  
       FROM    sys.foreign_keys Fk LEFT OUTER JOIN   
               sys.tables TbR ON TbR.OBJECT_ID = Fk.referenced_object_id INNER JOIN   
               sys.foreign_key_columns Fk_Cl ON Fk_Cl.constraint_object_id = Fk.OBJECT_ID   
       WHERE   TbR.name = @tableName  
               AND schema_name(TbR.schema_id) = @schemaName  
               AND Fk_Cl.constraint_object_id = @FK_OBJECTID -- added 6/12/2008  
       ORDER BY Fk_Cl.constraint_column_id  

       OPEN cursor_fkeyCols  

       FETCH NEXT FROM    cursor_fkeyCols INTO @FKCOLUMN_NAME,@PKCOLUMN_NAME  

       SET @COUNTER = 1  
       SET @FKCOLUMNS = ''  
       SET @PKCOLUMNS = ''  

       WHILE @@FETCH_STATUS = 0   
       BEGIN   

           IF @COUNTER > 1   
           BEGIN  
               SET @FKCOLUMNS = @FKCOLUMNS + ','  
               SET @PKCOLUMNS = @PKCOLUMNS + ','  
           END  

           SET @FKCOLUMNS = @FKCOLUMNS + '[' + @FKCOLUMN_NAME + ']'  
           SET @PKCOLUMNS = @PKCOLUMNS + '[' + @PKCOLUMN_NAME + ']'  

           SET @COUNTER = @COUNTER + 1  

           FETCH NEXT FROM    cursor_fkeyCols INTO @FKCOLUMN_NAME,@PKCOLUMN_NAME  
       END  

       CLOSE cursor_fkeyCols   
       DEALLOCATE cursor_fkeyCols   



   END  

   FETCH NEXT FROM    cursor_fkeys   
      INTO @FK_NAME,@FK_OBJECTID,  
           @FK_DISABLED,  
           @FK_NOT_FOR_REPLICATION,  
           @DELETE_RULE,     
           @UPDATE_RULE,     
           @FKTABLE_NAME,  
           @FKTABLE_OWNER,  
           @PKTABLE_NAME,  
           @PKTABLE_OWNER  
END  

CLOSE cursor_fkeys   
DEALLOCATE cursor_fkeys 
END

用于跑步使用：

EXEC DropRestoreDependencies dbo, ParentTable

Answer 1

问题是你只准备SQL语句而不是执行它（我认为）

CREATE PROCEDURE DropDependencies(@TableName VARCHAR(50))
AS
BEGIN
DECLARE @SQL nvarchar(max)
SELECT @SQL = 'ALTER TABLE ' + OBJECT_SCHEMA_NAME(parent_object_id) + '.[' + OBJECT_NAME(parent_object_id) + '] DROP CONSTRAINT ' + name
FROM sys.foreign_keys WHERE referenced_object_id=object_id(@TableName)
EXEC @SQL
END


EXEC DropDependencies 'TableName'

每当从构造的字符串中使用EXEC时，请确保您不会受到SQL注入攻击的攻击。</ p>

Answer 2

使用游标浏览SELECT结果，使用单列填充变量，并使用EXEC（@YourVariable）执行该查询。一定要在变量周围使用parens！

Answer 3

试用SP_ExecuteSQL或Exec。我看到你正在使用Exec。也许SP_ExecuteSQL可行吗？

删除给定表的FK的存储过程

3 个答案: