SQL Server 树形表非循环递归查询

http://www.cnblogs.com/cracker/archive/2012/07/07/2580781.html

 很多人可能想要查询整个树形表关联的内容都会通过循环递归来查...事实上在微软在SQL2005或以上版本就能用别的语法进行查询，下面是示例。

--通过子节点查询父节点
WITH 
TREE AS( 
SELECT * FROM tstructure 
WHERE id = 6  -- 要查询的子 id 
UNION ALL 
SELECT tstructure.* FROM tstructure, TREE 
WHERE TREE.parent = tstructure.id
) 
SELECT * FROM TREE

--通过父节点查询子节点
WITH 
TREE AS( 
SELECT * FROM tstructure 
WHERE parent = 2  -- 要查询的父 id 
UNION ALL 
SELECT tstructure.* FROM tstructure, TREE 
WHERE tstructure.parent = TREE.id
) 
SELECT * FROM TREE

来一个我现实中用到的代码吧

WITH tree
AS
(    
SELECT * FROM [shar].[t_module]  WHERE url='{0}'     
UNION ALL   
SELECT [shar].[t_module].* FROM [shar].[t_module], tree   WHERE TREE.fid = [shar].[t_module].id
) 
SELECT distinct * FROM tree order by code desc