Sabre\CardDAV\Backend\PDO::__construct PHP Method

    function __construct(\PDO $pdo, $addressBooksTableName = 'addressbooks', $cardsTableName = 'cards', $addressBookChangesTableName = 'addressbookchanges')
    {
        $this->pdo = $pdo;
        $this->addressBooksTableName = $addressBooksTableName;
        $this->cardsTableName = $cardsTableName;
        $this->addressBookChangesTableName = $addressBookChangesTableName;
    }

    public function __construct() {

		$oPdo = self::GetPDO();
		$sDbPrefix = '';

		parent::__construct($oPdo, $sDbPrefix.'oc_contacts_addressbooks', $sDbPrefix.'oc_contacts_cards');
    }