int customerId = selectQueryInt("SELECT id FROM customers ORDER BY id DESC LIMIT 1") + 1;
            int autosaleId = selectQueryInt("SELECT id FROM autosales ORDER BY id DESC LIMIT 1") + 1;
            System.out.println("customer:" + customerId + " autosale:" + autosaleId + " car:" + list.get(5));
            //add customer
            queryString.add("INSERT INTO customers(id,fname,lname,email) VALUES("
                    + customerId + "," + list.get(0) + "," + list.get(1) + "," + list.get(2) + ")");
            //add autosale
            queryString.add("INSERT INTO autosales(id,name,address) VALUES("
                    + autosaleId + "," + list.get(3) + "," + list.get(4) + ")");
            //add order
            queryString.add("INSERT INTO orders(id,customer_id,autosale_id,created_at) VALUES("
                    + orderId + "," + customerId + "," + autosaleId + ",current_date)");
            //add order_cars
            for(int i = 5; i < list.size(); i++){
                queryString.add("INSERT INTO orders_cars(order_id, car_id) VALUES(" + orderId + "," + list.get(i));
            }
executeQuery(queryString, "add");

executeQuery(List<String> queryString, String type) {
.
.
.
            conn.setAutoCommit(false);
            stmt = conn.createStatement();
            for(int i = 0; i < queryString.size(); i++){
                stmt.executeUpdate(queryString.get(i));
                System.out.println("insert: " + i);
            }
            conn.commit();
.
.
.
}