how do i convert this php in cc6?

$db =& JFactory::getDBO();
$query = "
  SELECT *
    FROM  `#__chronoforms_data_recommendation`
    WHERE `applicant_exist` = '' AND `year` = '2021'";

$db->setQuery($query);
$recommendations = $db->loadObjectList();


foreach ( $recommendations as $r ) {

  // get matching applications
  $query = "
    SELECT `aid`
      FROM  `#__chronoforms_data_scholarship-application`
      WHERE `applicant_firstname` = '{$r->applicant_firstname}'
        AND `applicant_lastname` = '{$r->applicant_lastname}'
       AND `year` =  '2021'
      LIMIT 1 ;
 ";
  $db->setQuery($query);
  $applicant_aid = $db->loadResult();

 // check if any matches found
  if ( !$applicant_aid ) {
    //echo '<i class="icon-ban-circle red"> <i>No matches found</i></i>';
    continue;
  }
  // Update the recommendation
  $query = "
    UPDATE `#__chronoforms_data_recommendation`
      SET `applicant_exist` = {$applicant_aid}
      WHERE  `aid` = {$r->aid}
  ";
  $db->setQuery($query);
  $db->query();
}
// TODO 
// in applications {view:table} display count of how many recommendations have the same applicant aid).
//count on-the-fly and not write to table.