@WebMethod(operationName = "ReadProduct")
    public ArrayList<Product> ReadProduct(@WebParam(name = "prod_id") String prod_id) {
            Product prod  = new Product();
            ArrayList<Product> prods = new ArrayList<Product>();
            ArrayList<QueryCriteria> qc = new ArrayList<QueryCriteria>();
            if(!prod_id.equals("-1")){
                qc.add(new QueryCriteria("prod_id", prod_id, Operand.EQUALS));
            }
            ArrayList<String> fields = new ArrayList<String>();
            ArrayList<QueryOrder> order = new ArrayList<QueryOrder>();
        try {
           prods = prod.Read(qc, fields, order);
        } catch (SQLException ex) {
            Logger.getLogger(JAX_WS.class.getName()).log(Level.SEVERE, null, ex);
        }
            if(prods.isEmpty()){
                return null;
            }
        return prods;
    }