private function getMainNodeId($contentId)
{
$query = $this->handler->createSelectQuery();
$query->select('node_id')->from($this->handler->quoteTable('ezcontentobject_tree'))->where($query->expr->lAnd($query->expr->eq($this->handler->quoteColumn('contentobject_id'), $query->bindValue($contentId, null, \PDO::PARAM_INT)), $query->expr->eq($this->handler->quoteColumn('node_id'), $this->handler->quoteColumn('main_node_id'))));
$statement = $query->prepare();
$statement->execute();
$result = $statement->fetchAll(\PDO::FETCH_ASSOC);
if (count($result) === 1) {
return (int) $result[0]['node_id'];
} else {
return false;
}
}