public static function getAllApplications()
 {
     $db = Connection::getInstance();
     $mysqli = $db->getConnection();
     $query = "select * from application;";
     $result = $mysqli->query($query);
     $application_set = array();
     if ($result->num_rows > 0) {
         while ($row = $result->fetch_assoc()) {
             $application = new Application();
             $application->setSchool_id($row["schoolId"]);
             $application->setApplication_id($row["application_id"]);
             $application->setApplicant_id($row["applicantId"]);
             $application->setType($row["typeOfApplication"]);
             $application->setMedium($row["medium"]);
             $application->setOrderOfPreference($row["orderOfPreference"]);
             $application->setDistance($row["distanceToSchool"]);
             $application->setIsverified($row["isverified"]);
             $application_set[] = $application;
         }
     }
     return $application_set;
 }