/**
* @return \MongoDB\Database
*/
private function createDatabaseObject()
{
$options = ['readPreference' => $this->readPreference, 'writeConcern' => $this->writeConcern];
if ($this->db === null) {
$this->db = $this->connection->getClient()->selectDatabase($this->name, $options);
} else {
$this->db = $this->db->withOptions($options);
}
}