SqlServer父节点与子节点查询及递归

来源：互联网发布：淘宝店铺哪里购买编辑：程序博客网时间：2024/04/30 05:52

/*
标题:sql server中递归的实现
作者:axin
时间:2012-3-24
*/
set nocount on
if OBJECT_ID('tb','U') is not null drop table tb
go
create table tb(ID int,PID INT)
insert into tb
select 1,0 union all
select 2,1 union all
select 3,2 union all
select 4,3 union ALL
select 5,4 union ALL
select 6,5 union ALL
select 7,6
--自定义函数方式实现父节点查询子节点
if OBJECT_ID('GetChildID') is not null drop function GetChildID
go
create function GetChildID(@ParentID int)
returns @t table(ID int)
as
begin
insert into @t select ID from tb where PID=@ParentID
while @@rowcount<>0
begin
insert into @t select a.ID from tb as a
inner join @t as b
on a.PID=b.ID
and not exists(select 1 from @t where ID=a.ID)
end
return
end
go
select * from dbo.GetChildID(1)
--自定义函数方式实现子节点查询父节点
if OBJECT_ID('GetParentID') is not null drop function GetParentID
go
create function GetParentID(@ChildID int)
returns @t table(PID int)
as
begin
insert into @t select PID from tb where ID=@ChildID
while @@rowcount<>0
begin
insert into @t select a.PID from tb as a
inner join @t as b
on a.ID=b.PID
and not exists(select 1 from @t where PID=a.PID)
end
return
end
go
select * from dbo.GetParentID(3)
--公用表表达式实现父节点查询子节点(SqlServer2005+)
DECLARE @ParentID int
SET @ParentID=1
with CTEGetChild as
(
select * from tb where PID=@ParentID
UNION ALL
(SELECT a.* from tb as a inner join
CTEGetChild as b on a.PID=b.ID
)
)
SELECT * FROM CTEGetChild
--公用表表达式实现子节点查询父节点(SqlServer2005+)
DECLARE @ChildID int
SET @ChildID=6
DECLARE @CETParentID int
select @CETParentID=PID FROM tb where ID=@ChildID
with CTEGetParent as
(
select * from tb where ID=@CETParentID
UNION ALL
(SELECT a.* from tb as a inner join
CTEGetParent as b on a.ID=b.PID
)
)
SELECT * FROM CTEGetParent