Can EARNING vodes be implemented with this code?

I was just wandering if users can earn vodes by posting a message on a Fireboard or SMF forum, or using other components. Would this code work with the "+1" in the $sql = "UPDATE #__vode_credits SET credit=credit+1 WHERE userid='$uid'";

<?php
class Vodes {
function Vodes(){}

function getVodes( $uid ){
$database =& JFactory::getDBO();
$sql = "SELECT credit FROM #__vode_credits WHERE userid='$uid'" ;
$database->setQuery( $sql );
$balance = $database->loadResult();
return $balance ? $balance : 0;
}

function updateVodes( $uid ){
$database =& JFactory::getDBO();
echo $uid;
$sql = "UPDATE #__vode_credits SET credit=credit+1 WHERE userid='$uid'";
$database->setQuery( $sql );
if( !$database->query()) return false;
return true;
}
}
?>

Yes, something like that should work.