class Salesman {
    public function Salesman(DataFieldFetcher fetcher)
    {
        this.setId(fieldFetcher.getId());
        this.setFirstName(fieldFetcher.getFirstName()); 
        this.setLastName(fieldFetcher.getLastName()); 
        this.setDateEntered(fieldFetcher.getDateEntered());
    }
}

class Controller{

    function loadSalesData(){

        //use DB library to execute the following query return as IDataReader rdr 
        
        $query = 
          "SELECT 
          s.id AS saleId, 
          s.dateEntered AS saleDateEntered, 
          u.id AS salemanId, 
          u.firstName, 
          u.lastName, 
          u.dateEntered AS salesmanDateEntered 
          FROM salesmen u INNER JOIN sales s ON u.id = s.salesmanId WHERE s.id = ?"
        ;
        
        /* ...

        ...*/
        
        DataSet ds=databaseDoohickey.GetDataSet(sql);

        DataSetFieldFetcher salesManFieldFetcher = new SalesmanFieldFetcher(ds);

        salesman = new Salesman(); 
        salesman.load(salesManFieldFetcher); 
        
        // ...
    } 
}