How to update multiple row with XML

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There are two tables one is Product_mst and other is Stock_Master I have one web page for placing order of multiple product im using XML to insert multiple product it is working fine but at the same time i want to update my Stock_master to reduce the stock qty for that i added update block on Order sp i want to update the stock product wise bt now it is updating to all rows Please help me please find my SP below

What I have tried:

ALTER PROCEDURE [dbo].[InsertOrderDtls]
(
@OrderXml XML
)
AS
BEGIN
INSERT INTO order_dtls (OrderId, ProdId, Rate,Qty, Amount)
SELECT p.value('@OrderId','INT'), p.value('@ProdId','INT'),
p.value('@Rate','FLOAT') ,p.value('@Qty','FLOAT'), p.value('@Amount','FLOAT')
--,p.value('@AddedBy','INT')
--,p.value('@AddedOn','SMALLDATETIME')

FROM @OrderXml.nodes('/ROOT/Order')n(p);

--RETURN @@ROWCOUNT;

update product_Mst
set Qty = Qty - q.value('@Qty','FLOAT')
from @OrderXml.nodes('/ROOT/Order')n(q);

--update Stock_Master
--set Qty = Qty - r.value('@Qty','FLOAT')
--from @OrderXml.nodes('/ROOT/Order')n(r)
--where ProductId = r.value('@ProdId','INT');

END

Posted 25-Jan-17 22:54pm

Member 12966735

Updated 26-Jan-17 2:37am

v2

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Richard Deeming · Accepted Answer · 2017-01-26T02:37:00

Try something like this:

SQL

UPDATE
    M
SET
    Qty = Qty - q.value('@Qty','FLOAT') 
FROM
    product_Mst As M
    INNER JOIN @OrderXml.nodes('/ROOT/Order') As n(q)
    ON q.value('@ProdId','INT') = M.ProductId
;

UPDATE 
    M
SET 
    Qty = Qty - q.value('@Qty','FLOAT') 
FROM
    Stock_Master As M
    INNER JOIN @OrderXml.nodes('/ROOT/Order') As n(q)
    ON q.value('@ProdId','INT') = M.ProductId
;