/**
* Generate a new value from the specified sequence in the database, and
* return it.
* This is supported only on RDBMS brands that support sequences
* (e.g. Oracle, PostgreSQL, DB2). Other RDBMS brands return null.
*
* @param string $sequenceName
* @return string
*/
public function nextSequenceId($sequenceName)
{
return $this->adapter->nextSequenceId($sequenceName);
}