SQLserver2008使用表达式递归查询

<div class="codetitle"><a style="CURSOR: pointer" data="98064" class="copybut" id="copybut98064" onclick="doCopy('code98064')"> 代码如下:<div class="codebody" id="code98064">
--由父项递归下级
with cte(id,parentid,text)
as
(--父项
select id,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,text from cte --------------------- --由子级递归父项
with cte(id,text)
as
(--下级父项
select id,text from treeview where id = 450
union all
--递归结果集中的父项
select t.id,t.text from treeview as t
inner join cte as c on t.id = c.parentid
)
select id,text from cte