循环删除外键约束

SQL删除，有外键约束常常不能删除，需要先删除外键

--/***********PowerBy：rovedog ***************/
--/第1步**********删除所有表的外键约束*************************/

DECLARE c1 CURSOR  FOR
SELECT  ‘alter table [‘+ object_name(parent_obj) + ‘] drop constraint [‘+name+‘]; ‘
FROM  sysobjects
WHERE  xtype = ‘F‘
OPEN  c1
DECLARE  @c1 varchar(8000)
FETCH  NEXT  FROM  c1 INTO  @c1
WHILE (@@fetch_status=0)
BEGIN
EXEC (@c1)
FETCH  NEXT  FROM  c1 INTO  @c1
END
CLOSE  c1
DEALLOCATE  c1

--/第2步**********删除所有表*************************/

DECLARE  @sql varchar(8000)
WHILE  (select count(*) FROM  sysobjects WHERE  type=‘U‘)>0
BEGIN
SELECT @sql=‘drop table [‘ + name+‘]‘
FROM sysobjects
WHERE (type = ‘U‘)
ORDER BY ‘drop table [‘ + name+‘]‘
EXEC (@sql)
END 

常常在PD中设置如下

原文地址：https://www.cnblogs.com/rovedog/p/12388278.html