public function save(CustomerModel $customer)
 {
     try {
         $sql = "INSERT INTO {$this->dbTable} (" . self::$SSNColumn . "," . self::$FirstNameColumn . "," . self::$LastNameColumn . "," . self::$emailColumn . ") VALUE (?,?,?,?)";
         $params = array($customer->getSSN(), $customer->getFirstName(), $customer->getLastName(), $customer->getEmail());
         $query = $this->database->prepare($sql);
         $query->execute($params);
     } catch (\PDOException $e) {
         return false;
     }
 }