SQL Server存储过程（菜单系统） - 微软SQL Server 2005的

Question

想 - 我已经表结构

 
elementid, parentid, elementtitle,   sortorder 
160 0    Brand New Tutorial  1 
161 160   Brand New Tutorial New Step 1 
168 5   Tutorial Topic 1.1  1 
171 168   Tutorial Topic 1.1.1   1 
172 171   Tutorial Topic 1.1.1.1  1 

我需要能够设置一个存储过程，让我来更新Elementid的下面， Parentid的关系。

这里是我的正常SQL用于产生的树：

WITH menu AS 
(
SELECT parentid, elementid, elementtitle, sortorder FROM dbo.ta_tutorial_elements WHERE (elementid = @eid) 
    UNION ALL 
    SELECT e.parentid, e.elementid, e.elementtitle, e.sortorderFROM dbo.ta_tutorial_elements AS e INNER JOIN menu AS m ON e.parentid = m.elementid 
) 
SELECT * INTO [#tmpA] FROM menu 

我认为可能是可以使用临时表的过度复制表，然后以某种方式使用插入的身份进入我的标准表从elementid和根父母开始...然而，在那之后，我几乎失去了如何递归地处理所有parentid's，elementid与他们的关系......（在SQL Server中是否可能？）。

我看到类似以下内容：

CREATE PROCEDURE [DBO] [sp_ta_copy_tutorial_by_id] @eid BIGINT AS上 SET NOCOUNT BEGIN DECLARE @recid BIGINT

SET @recid  = (SELECT IDENT_CURRENT('ta_tutorial_elements')); 

WITH menu AS 
(
SELECT parentid, elementid, elementtitle, sortorder, userid, createddate FROM dbo.ta_tutorial_elements WHERE (elementid = @eid) 
    UNION ALL 
    SELECT e.parentid, e.elementid, e.elementtitle, e.sortorder, e.userid, e.createddate FROM dbo.ta_tutorial_elements AS e INNER JOIN menu AS m ON e.parentid = m.elementid 
) 
SELECT * INTO [#tmpA] FROM menu 

ALTER TABLE [#tmpA] 
DROP COLUMN elementid 

SELECT * INTO [#tmpB] FROM [#tmpA]; 

UPDATE b SET b.parentid = 
    CASE 
     WHEN b.parentid <> 0 
     THEN @recid 
     ELSE 0 
    END 
FROM [#tmpB] as b 

INSERT INTO [ta_tutorial_elements] SELECT * FROM [#tmpB] 
DROP TABLE [#tmpA] 
DROP TABLE [#tmpB] 

END

Answer 1

 
CREATE PROCEDURE [dbo].[sp_ta_copy_tutorial_by_id] 
    @eid bigint 
AS 
SET nocount on 
BEGIN 
/*************************************** 
*  CREATE A 
***************************************/ 
SELECT   * 
INTO  #tmpA 
FROM  ta_tutorial_elements 
WHERE  elementid IN (SELECT elementid from fn_ta_tutorial_tree_by_element (@EID)) 

/*************************************** 
*  DUPLICATE RECORDS 
***************************************/ 
DECLARE   @CNT INT 
SET    @CNT = (SELECT max(elementid) FROM ta_tutorial_elements) 

INSERT    
INTO  ta_tutorial_elements (elementtitle, parentid) 
      SELECT elementtitle, parentid FROM #tmpA 

/*************************************** 
*  CREATE B 
***************************************/ 
SELECT   * 
INTO  #tmpB 
FROM  ta_tutorial_elements 
WHERE  elementid > @CNT 

SELECT   bpid.elementid as originalelementid, 
        brow.elementid as newparentid 
INTO  #tmpC 
FROM  #tmpB bpid LEFT OUTER JOIN 
        #tmpA aeid ON bpid.parentid = aeid.elementid LEFT OUTER JOIN 
        (
         SELECT   elementid, ROW_NUMBER() OVER (ORDER BY elementid ASC) as rownum 
         FROM  #tmpA 
       ) arow ON arow.elementid = aeid.elementid LEFT OUTER JOIN 
        (
         SELECT   elementid, ROW_NUMBER() OVER (ORDER BY elementid ASC) as rownum 
         FROM  #tmpB 
       ) brow ON brow.rownum = arow.rownum LEFT OUTER JOIN 
        #tmpB beid ON beid.elementid = brow.elementid 

UPDATE   #tmpC 
SET    newparentid = 0 
WHERE  newparentid IS NULL 

UPDATE   t2 
SET    parentid = t1.newparentid 
FROM  #tmpC t1 LEFT OUTER JOIN 
        ta_tutorial_elements t2 ON t1.originalelementid = t2.elementid 

/*************************************** 
*  TEMP DISPLAY 
***************************************/ 
SELECT * FROM ta_tutorial_elements WHERE elementid > @CNT 

DROP TABLE #tmpA 
DROP TABLE #tmpB 
DROP TABLE #tmpC 

END 

Answer 2

结账CTEs (common table expressions)。您可以在存储过程的上下文中使用CTE在某些递归之后生成菜单数据。其实它看起来像你已经有一个CTE;该链接描述了该上下文中的递归。