public function getFieldValues(string $field_name)
    {
        try {
            $field = [];
            $result = $this->stmt->fetchAll(\PDO::FETCH_ASSOC);
            if (array_key_exists($field_name, $result[0])) {
                foreach ($result as $row) {
                    $field[] = $row[$field_name];
                }
            } else {
                throw new \Exception("Field '$field_name' is not present in the current result set.\n");
            }
            return $field;
        } catch (\PDOException $e) {
            die('Error: ' . $e->getMessage());
        } catch (\Exception $e) {
            die("Error: " . $e->getMessage());
        }
    }