SQL Simple analysis of MRP resources

Wrote a simple MRP based on the data passed in, the judgment of the subordinate, the parent table, the child table

Idea:

3 variables table, the first to save the incoming product, this side of the table do a loop is the finished product is the same as in, take the first row of the finished table, the data as the parent table and the Child Table Association, take out the related items, save to the second variable table.

Make a loop again, associate the second variable table with the parent table, if there is data stored in the third variable table, delete the same data from the second variable table according to the third variable table, then associate the third variable table with the parent table sub-table, reverse the data back to the second variable table, and empty the third variable table. Loop to no condition to be established, can.

Here's My method:

　　

----------------Begin----------------------------
Declare @wltemp table (ID int,code varchar (50))
Insert into @wltemp (Id,code)
Select ' 1 ', ' par-471j0-60 '
--union
--select ' 2 ', ' par-102j0-60 '

Declare @temp table (FID Int,mainid int,num int,whscode int)
Declare @temp1 table (FID Int,mainid int,num Int,whscode int)
DECLARE @i int
Declare @maxvalue int
Select @maxvalue =count (1) from @wltemp
Select @i=1
while (@i& Lt [email protected])
Begin
If exists (select top 1 1 from dchild1727 a inner joins dfather1727 B on A.fid=b.id
Inner joins DITM C on B. Mainid=c.id INNER JOIN @wltemp D on C.fathercode=d.code where [email protected])
begin
INSERT INTO @temp (FID, Mainid,num,whscode)
Select A.fid,a.mainid,a.c_num,a.whscode from dchild1727 a inner joins dfather1727 B on a.fid=b.id Br>inner join DITM C on b.mainid=c.id inner join @wltemp D on C.fathercode=d.code where [email protected]
End
S ET @[email protected]+1

The upper part of the-------------------------is--------------------the next part of the finished name is Loop-------------------------------
While exists (select top 1 1 from dfather1727 a inner joins @temp B on A.mainid=b.mainid)
Begin
Insert into @temp1 (Fid,mainid,num,whscode)
Select B.fid,b.mainid,b.num,b.whscode from dfather1727 a inner joins @temp B on A.mainid=b.mainid

Delete from @temp where Mainid in (select Mainid from @temp1 a where A.mainid=mainid and A.fid=fid)

Insert into @temp (Fid,mainid,num,whscode)
Select A.fid,a.mainid,a.c_num,a.whscode
From dchild1727 a inner joins dfather1727 B on a.fid=b.id inner joins @temp1 C on B.mainid=c.mainid
Delete from @temp1
End
End

SELECT B.fathercode Item code, b.itemname item name, A.whscode Warehouse, a.num quantity from @temp a inner join DITM B on a.mainid=b.id
---------------End-------------

SQL Simple analysis of MRP resources