SQLserver2008使用表达式递归查询

sqlserver2008使用表达式递归查询语句，需要的朋友可以参考下。

代码如下:
–由父项递归下级
with cte(id,parentid,text)
as
(–父项
select id,parentid,text from treeview where parentid = 450
union all
–递归结果集中的下级
select t.id,t.parentid,t.text from treeview as t
inner join cte as c on t.parentid = c.id
)
select id,parentid,text from cte

———————

–由子级递归父项
with cte(id,parentid,text)
as
(–下级父项
select id,parentid,text from treeview where id = 450
union all
–递归结果集中的父项
select t.id,t.parentid,t.text from treeview as t
inner join cte as c on t.id = c.parentid
)
select id,parentid,text from cte