內容來自機械工業出版的倉庫管理系統設計一書
表結構{WareHouserID , ParentWarehouseID }
查詢指定節點跟其子節點的信息
ALTER? FUNCTION dbo.GetWareSubtreeInfo(@WareHouseID int)
RETURNS @treeinfo table
(
[WareHouseID] [int] NOT NULL,
[ParentWarehouseID] [int] NOT NULL,
[Level] [int] NOT NULL
) AS
BEGIN
?--返回所有倉庫，不按層次
?IF @WareHouseID=0
?BEGIN
??INSERT INTO @treeinfo
??SELECT WareHouseID,0,0? From? [WareHouses]
??RETURN
?END
?
?DECLARE @level AS int
?SELECT @level = 0
?
?INSERT INTO @treeinfo
?SELECT WareHouseID, ParentWarehouseID, @level
?From [WareHouses]
?WHERE [WareHouseID] = @WareHouseID

----每次循環是@level會加1,這樣做Join 連接時會不斷的將子類,以及子來的子類逐步添加到臨時表 里
?WHILE @@ROWCOUNT > 0
?BEGIN
?
??SET @level = @level + 1
??
??INSERT INTO @treeinfo
??
??SELECT D.WareHouseID, D.ParentWarehouseID, @level
??From [WareHouses] As D
??JOIN @treeinfo AS T
??ON D.[ParentWarehouseID] = T.[WareHouseID] AND T.[Level] = @level - 1
?
?END
?RETURN
END

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