SQL2008使用表达式递归查询  

--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