递归删除数据

 

Code

   
     /*
 删除某个产品目录，一并删除其子目录
 @CatalogId：要删除的节点编号
*/
Create Proc DeleteProcuctCatalog
@CatalogId Int
As
--影响的行
Declare @State Int

--改变当前目录的删除状态
Update tProductCatalog Set DeleteFlag = 1 Where ProductCatalogID = @CatalogId And DeleteFlag = 0
Set @State = (Select @@RowCount)

If @State = 0
 return;

--把子节点插入临时表中 
Create Table #tmp
(
 ProductCatalogID int, 
 ParentCatalogID int,
 DeleteFlag tinyint,
 New bit default 1
)
Insert Into #tmp (ProductCatalogID, ParentCatalogID, DeleteFlag) (Select ProductCatalogID, ParentCatalogID, DeleteFlag From dbo.tProductCatalog Where ParentCatalogID = @CatalogId)

--修改所有子节点的删除状态
While @State != 0
Begin

 Update tProductCatalog Set DeleteFlag = 1 Where ProductCatalogID In (Select ProductCatalogID From #tmp Where DeleteFlag = 0)
 
 --保存所有节点的子节点
 Update #tmp Set New = 0
 Insert Into #tmp (ProductCatalogID, ParentCatalogID, DeleteFlag) (Select ProductCatalogID, ParentCatalogID, DeleteFlag From dbo.tProductCatalog Where ParentCatalogID In (Select ProductCatalogID From #tmp Where New = 0))
 Delete #tmp Where New = 0
 Set @State = (Select Count(*) From #tmp)
End

Drop Table #tmp