code: @Override
     protected ResultSet findLastOrderNumberByParentIdentifier(String parentIdentifier) throws SQLException
     {
        if (findLastOrderNumberByParentId == null)
        {
           findLastOrderNumberByParentId = dbConnection.prepareStatement(FIND_LAST_ORDER_NUMBER_BY_PARENTID);
        }
        else
        {
           findLastOrderNumberByParentId.clearParameters();
        }
  
        findLastOrderNumberByParentId.setString(1, parentIdentifier);
        return findLastOrderNumberByParentId.executeQuery();
     }
docs: {@inheritDoc}