public function get_all()
 {
     $program_list = array();
     $this->db->connect();
     $sql = "SELECT * from tbl_program";
     $result = $this->db->fetchQuery($sql);
     if ($result->num_rows > 0) {
         while ($row = $result->fetch_assoc()) {
             $program = new Program();
             $program->set_id($row['id']);
             $program->set_name($row['name']);
             $program->set_no_of_subjects($row['no_of_subjects']);
             $program->set_department_id($row['department_id']);
             array_push($program_list, $program);
         }
     }
     $this->db->close();
     return $program_list;
 }