protected function countContentRelations($fromId = null, $toId = null)
{
$query = $this->getDatabaseHandler()->createSelectQuery();
$query->select('count(*)')->from('ezcontentobject_link');
if ($fromId !== null) {
$query->where('from_contentobject_id=' . $fromId);
}
if ($toId !== null) {
$query->where('to_contentobject_id=' . $toId);
}
$statement = $query->prepare();
$statement->execute();
return (int) $statement->fetchColumn();
}