eZ\Publish\Core\Persistence\Database\SelectQuery::orderBy PHP 메소드

    public function orderBy($column, $type = self::ASC);

 /**
  * Helper for {@see listVersions()} and {@see listVersionsForUser()} that filters duplicates
  * that are the result of the cartesian product performed by createVersionInfoFindQuery().
  *
  * @param \eZ\Publish\Core\Persistence\Database\SelectQuery $query
  *
  * @return string[][]
  */
 private function listVersionsHelper(SelectQuery $query)
 {
     $query->orderBy($this->dbHandler->quoteColumn('id', 'ezcontentobject_version'));
     $statement = $query->prepare();
     $statement->execute();
     $results = array();
     $previousId = null;
     foreach ($statement->fetchAll(\PDO::FETCH_ASSOC) as $row) {
         if ($row['ezcontentobject_version_id'] == $previousId) {
             continue;
         }
         $previousId = $row['ezcontentobject_version_id'];
         $results[] = $row;
     }
     return $results;
 }