/**
     * geocodes all missing records in a DB table and then stores the values
     * in the DB record
     *
     * only works if your DB table has the necessary fields
     * helpful when calculating a batch of addresses and save the latitude/longitude automatically
     */
    public function calculateCoordinatesForAllRecordsInTable($tableName, $latitudeField = 'latitude', $longitudeField = 'longitude', $streetField = 'street', $zipField = 'zip', $cityField = 'city', $countryField = 'country', $addWhereClause = '')
    {
        // fetch all records without latitude/longitude
        $records = $GLOBALS['TYPO3_DB']->exec_SELECTgetRows('*', $tableName, 'deleted=0 AND
			(' . $latitudeField . ' IS NULL OR ' . $latitudeField . '=0 OR ' . $latitudeField . '=0.00000000000
				OR ' . $longitudeField . ' IS NULL OR ' . $longitudeField . '=0 OR ' . $longitudeField . '=0.00000000000)' . $addWhereClause, '', '', '500');
        if (class_exists('\\t3lib_div')) {
            \t3lib_div::loadTCA($tableName);
        } else {
            TYPO3\CMS\Core\Utility\GeneralUtility::loadTCA();
        }
        if (count($records) > 0) {
            foreach ($records as $record) {
                $country = $record[$countryField];
                // resolve the label for the country
                if ($GLOBALS['TCA'][$tableName]['columns'][$countryField]['config']['type'] == 'select') {
                    foreach ($GLOBALS['TCA'][$tableName]['columns'][$countryField]['config']['items'] as $itm) {
                        if ($itm[1] == $country) {
                            if (is_object($GLOBALS['TSFE'])) {
                                $country = $GLOBALS['TSFE']->sL($itm[0]);
                            } else {
                                $country = $GLOBALS['LANG']->sL($itm[0]);
                            }
                        }
                    }
                }
                // do the geocoding
                $coords = $this->getCoordinatesForAddress($record[$streetField], $record[$zipField], $record[$cityField], $country);
                if ($coords) {
                    // update the record to fill in the latitude and longitude values in the DB
                    $GLOBALS['TYPO3_DB']->exec_UPDATEquery($tableName, 'uid=' . intval($record['uid']), array($latitudeField => $coords['latitude'], $longitudeField => $coords['longitude']));
                }
            }
        }
        return count($records);
    }