Script used in RSForms on submission

$skater = $_POST['form']['SkaterName'];
$sessions = $_POST['form']['Sessions'];
$db = JFactory::getDBO();
$query = $db->getQuery(true);

$skater_string = $skater;
$session = $sessions[0];
$session2 = $session;

// uncomment these two lines if you want it to use the current logged in user's name rather than the one entered on the form.
//$user = JFactory::getUser();
//$skater = {$user->name}

if (count($sessions))
{
    for($i=0; $i<count($sessions);$i++)
    {
        if($i>>0)
        {
            $session2 = $session2 . '`, `' . $sessions[$i];
            $skater_string = $skater_string . '\',\' ' . $skater;
        }
       
    }
    $query="INSERT INTO `mintoska_jos151`.`j25_rsform_skater_sessions` (`{$session2}`) VALUES ('{$skater_string}')";
    $db->setQuery($query);
    $db->query();
}