how to increase or decrease the quantity in a field in my sql when we enter the new quantity

Posted by madhu on Stack Overflow See other posts from Stack Overflow or by madhu
Published on 2012-11-07T04:58:19Z Indexed on 2012/11/07 5:00 UTC
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mysql

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jsp

I'm doing a project I'm encountering a problem in my project.........

the problem is i would like to increase or decrease the quantity in my sql quantity field when i pass the issued or delivered quantity i.e.... initially the quantity in the quantity filed is 1 when i intake the product of a quantity 10 then automatically it should update the quantity as 10+1=11 so it must update as 11, if i remove a 1 quantity it should update as 0........

how to write a code in jsp..........

pls do help

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