public PnFacturaCollection FetchByQuery(Query qry)
        {
            PnFacturaCollection coll = new PnFacturaCollection();

            coll.LoadAndCloseReader(qry.ExecuteReader());
            return(coll);
        }
        public PnFacturaCollection FetchAll()
        {
            PnFacturaCollection coll = new PnFacturaCollection();
            Query qry = new Query(PnFactura.Schema);

            coll.LoadAndCloseReader(qry.ExecuteReader());
            return(coll);
        }
        public PnFacturaCollection FetchByID(object IdFactura)
        {
            PnFacturaCollection coll = new PnFacturaCollection().Where("id_factura", IdFactura).Load();

            return(coll);
        }