protected function getContentLocationIds($contentObjectId) { $query = $this->databaseHandler->createSelectQuery(); $query->select('node_id')->from($this->databaseHandler->quoteTable(self::CONTENTOBJECT_TREE_TABLE))->where($query->expr->eq('contentobject_id', $contentObjectId)); $stmt = $query->prepare(); $stmt->execute(); $nodeIds = $stmt->fetchAll(PDO::FETCH_COLUMN); return is_array($nodeIds) ? array_map('intval', $nodeIds) : []; }