Question

我有下表

PNLTable([PnlId], 
          [Line], 
          [TotalisationId], 
          [Designation], 
          [Totalisation],
          ParentId).

我使用以下查询来获取每个pnlid所有子项

;WITH CTE 
AS
(
    SELECT PNLId ,concat('/',cast(PNLId as nvarchar(MAX)) )as tree, PNLParentId
    FROM [dbo].[DimPNL]
    WHERE PNLParentId IS NULL 
    UNION ALL
    SELECT T1.PNLId,concat( CTE.tree ,'/',cast(t1.PNLId as nvarchar(MAX))), T1.PNLParentId
    FROM [dbo].[DimPNL] AS T1
    INNER JOIN CTE
    ON T1.PNLParentId = CTE.PNLId
)
SELECT *
FROM CTE

我使用了存储过程spGetResult，它通过一些约束来更新Totalisation。

如何在spGetResultstarting和上面的查询之间进行组合，以便从最低级别的子级（根级）递归地开始更新？

Answer 1

您只需将已排序的结果插入到#temp表中，然后使用cursor迭代结果，如下所示：

;WITH CTE 
AS
(
    SELECT PNLId ,concat('/',cast(PNLId as nvarchar(MAX)) )as tree, PNLParentId
    FROM [dbo].[DimPNL]
    WHERE PNLParentId IS NULL 
    UNION ALL
    SELECT T1.PNLId,concat( CTE.tree ,'/',cast(t1.PNLId as nvarchar(MAX))), T1.PNLParentId
    FROM [dbo].[DimPNL] AS T1
    INNER JOIN CTE
    ON T1.PNLParentId = CTE.PNLId
)
-- order the results into a #temp table
SELECT *
INTO #temp
FROM CTE
ORDER BY PNLId, PNLParentId DESC -- set this accordingly

DECLARE @pnlId int   
DECLARE @pnlParentId int   

DECLARE db_cursor CURSOR FOR  
SELECT PNLId, PNLParentId 
FROM #temp 

OPEN db_cursor   
FETCH NEXT FROM db_cursor INTO @pnlId, @pnlParentId    

WHILE @@FETCH_STATUS = 0   
BEGIN   
       -- call ytour stored proc with required params here
       Exec [spGetResultstarting] @pnlId, @pnlParentId

       FETCH NEXT FROM db_cursor INTO @pnlId, @pnlParentId   
END   

CLOSE db_cursor   
DEALLOCATE db_cursor

将存储过程调用到递归cte中

1 个答案: