public function getDefaultCategoryString($oArticle)
    {
        $sLang = \OxidEsales\Eshop\Core\Registry::getLang()->getBaseLanguage();
        $oDB = \OxidEsales\Eshop\Core\DatabaseProvider::getDb();

        $sCatView = getViewName('oxcategories', $sLang);
        $sO2CView = getViewName('oxobject2category', $sLang);

        //selecting category
        $sQ = "select $sCatView.oxtitle from $sO2CView as oxobject2category left join $sCatView on $sCatView.oxid = oxobject2category.oxcatnid ";
        $sQ .= "where oxobject2category.oxobjectid=" . $oDB->quote($oArticle->getId()) . " and $sCatView.oxactive = 1 order by oxobject2category.oxtime ";

        return $oDB->getOne($sQ);
    }