public function getCard($addressBookId, $cardUri)
    {
        $stmt = $this->pdo->prepare('SELECT id, carddata, uri, lastmodified, etag, size FROM '.$this->cardsTableName.' WHERE addressbookid = ? AND uri = ? LIMIT 1');
        $stmt->execute([$addressBookId, $cardUri]);

        $result = $stmt->fetch(\PDO::FETCH_ASSOC);

        if (!$result) {
            return false;
        }

        $result['etag'] = '"'.$result['etag'].'"';
        $result['lastmodified'] = (int) $result['lastmodified'];

        return $result;
    }