--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