SQL Server 樹形表非循環遞歸查詢

   很多人可能想要查詢整個樹形表關聯的內容都會通過循環遞歸來查...事實上在微軟在SQL2005或以上版本就能用別的語法進行查詢，下面是示例。

--通過子節點查詢父節點
WITH 
TREE AS( 
    SELECT * FROM tstructure 
    WHERE id = 6  -- 要查詢的子 id 
    UNION ALL 
    SELECT tstructure.* FROM tstructure, TREE 
    WHERE TREE.parent = tstructure.id
) 
SELECT * FROM TREE

--通過父節點查詢子節點
WITH 
TREE AS( 
    SELECT * FROM tstructure 
    WHERE parent = 2  -- 要查詢的父 id 
    UNION ALL 
    SELECT tstructure.* FROM tstructure, TREE 
    WHERE tstructure.parent = TREE.id
) 
SELECT * FROM TREE

來一個我現實中用到的代碼吧

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