Question

Stored Procedure

CREATE DEFINER=`root`@`localhost` PROCEDURE `Sample`(IN itemId INT, IN itemQnty 
DOUBLE, IN invID INT)

BEGIN

DECLARE crntQnty DOUBLE;
DECLARE nwQnty DOUBLE;

SET crntQnty=(SELECT `QuantityOnHand` FROM `item` WHERE id=itemId);
SET nwQnty=itemQnty+crntQnty;
UPDATE `item` SET `QuantityOnHand`=nwQnty WHERE `Id`=itemId;

UPDATE `inventoryentry` SET `Status` = 1 WHERE `InventoryID`=invID AND 
`ItemID`=itemId;


END$$

In this stored procedure I have two update statements. IF first update execute successfully then second execute. what changes required to be made?

Answer 1

After the first UPDATE you can check the number of rows that were affected by ROW_COUNT().

If the ROW_COUNT() returns the desired number of updates you want (maybe > 0) then only fire second UPDATE.

Yo can surround the second UPDATE by an IF - END IF checking for the number of rows that were affected.