Fix issue with incorrect localization handling in Extbase (missing support for l10n_mode=exclude, which makes some relations missing). See http://bit.ly/1Djw1CV

Typo3DbQueryParser.php

<?php
namespace DmitryDulepov\Sample\Xclass;

class Typo3DbQueryParser extends \TYPO3\CMS\Extbase\Persistence\Generic\Storage\Typo3DbQueryParser {

	/**
	 * Fixes incorrect localisation handling in Extbase.
	 *
	 * @param string $tableName
	 * @param array $sql
	 * @param \TYPO3\CMS\Extbase\Persistence\Generic\QuerySettingsInterface $querySettings
	 */
	protected function addSysLanguageStatement($tableName, array &$sql, $querySettings) {
		if (is_array($GLOBALS['TCA'][$tableName]['ctrl'])) {
			if (!empty($GLOBALS['TCA'][$tableName]['ctrl']['languageField'])) {
				$sql['additionalWhereClause'][] = $tableName . '.' . $GLOBALS['TCA'][$tableName]['ctrl']['languageField'] . '=0';
			}
		}
	}

}

/*

Do not forget to register Xclass like:

$GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects']['TYPO3\\CMS\\Extbase\\Persistence\\Generic\\Storage\\Typo3DbQueryParser'] = array(
    'className' => 'DmitryDulepov\\Sample\\Xclass\\Typo3DbQueryParser',
);

*/

Link above is dead, here is the archive record: https://web.archive.org/web/20150502175529/http://www.dmitry-dulepov.com:80/2015/01/strange-code-in-extbase-persistance.html

Afaik this patch is not suitable for TYPO3 7.6 or 8.7