CREATE TABLE Item(ID int,Name varchar(10),Wast decimal(2,2))
INSERT Item SELECT 1,N'A产品',0.01
UNION ALL SELECT 2,N'B产品',0.02
UNION ALL SELECT 3,N'C产品',0.10
UNION ALL SELECT 4,N'D配件',0.15
UNION ALL SELECT 5,N'E物料',0.03
UNION ALL SELECT 6,N'F物料',0.01
UNION ALL SELECT 7,N'G配件',0.02
CREATE TABLE Bom(ItemID int,ChildId int)
INSERT Bom SELECT 1,4
UNION ALL SELECT 1,7 --A产品由D配件和G配件组成
UNION ALL SELECT 2,1
UNION ALL SELECT 2,6
UNION ALL SELECT 2,7 --B产品由F物料及G配件组成
UNION ALL SELECT 4,5
UNION ALL SELECT 4,6 --D配件由F物料组成
UNION ALL SELECT 3,2
UNION ALL SELECT 3,1 --C产品由A产品和B产品组成
GO
CREATE FUNCTION f_Bom(
@ItemIDs varchar(1000), --要查询物料清单及生产量的产品编号列表(逗号分隔)
@Num int --要生产的数量
)RETURNS @t TABLE(ItemID int,ChildId int,Nums int,Level int)
AS
BEGIN
DECLARE @Level int
SET @Level=1
INSERT @t SELECT a.ItemID,a.ChildId,ROUND(@Num/(1-b.Wast),0),@Level
FROM Bom a,Item b
WHERE a.ChildId=b.ID
AND CHARINDEX(','+RTRIM(a.ItemID)+',',','+@ItemIDs+',')>0
WHILE @@ROWCOUNT>0 and @Level<140
BEGIN
SET @Level=@Level+1
INSERT @t SELECT a.ItemID,b.ChildId,ROUND(a.Nums/(1-c.Wast),0),@Level
FROM @t a,Bom b,Item c
WHERE a.ChildId=b.ItemID
AND b.ChildId=c.ID
AND
a.Level=@Level-1
END
RETURN
END
GO
--调用函数展开产品1、2、3的结构及计算生产10个产品时,各需要多少个配件
SELECT a.ItemID,ItemName=b.Name,
a.ChildId,ChildName=c.Name,
a.Nums,a.Level
FROM f_Bom('1,2,3',10) a,Item b,Item c
WHERE a.ItemID=b.ID
AND a.ChildId=c.ID
ORDER BY a.ItemID,a.Level,a.ChildId