kmatle you say me : Now you must protect the script against SQL injection.
But what is the main idea of this,i check about Prepared Statements, but I do not understand the main idea, could you tell me, thanks.
I tell you to make a small security for my application ... basically take the serial of the device and compare it with serials previously added to the database .. in this case, as would be the general idea of Prepared Statements, if you have a basic example , thank you very much for your help, now my application came back to work a bit unstable ... but I'm trying to see what happens. Thank you