try{

            //taking input from user about how much balance
            Scanner input = new Scanner(System.in);
            Class.forName("net.ucanaccess.jdbc.UcanaccessDriver");
            String url = "jdbc:ucanaccess://c://Bibek//Atmcard.accdb";
            System.out.print("\nConnecting to database...");
            con = DriverManager.getConnection(url);
            st = con.createStatement();
            System.out.println("\n Enter balance you want to withdraw:\n");


            balance = Double.parseDouble(input.nextLine());
            String sql = "select AccountBalance From Atm";
            result = st.executeQuery(sql);
                while(result.next()){
                    //assigning balanceFromDb to deduct and update in database
                    Double balanceFromDb = result.getDouble("AccountBalance");
                    balanceFromDb=balanceFromDb-balance;
                    result.updateDouble("AccountBalance", balanceFromDb);
                    result.updateRow();
                }



    }catch(Exception ex){
            System.err.println(ex.toString());
    }

输出：连接到数据库…输入要提取的余额：

20

net.ucanaccess.jdbc.UcanaccessSQLException：尝试分配给不可更新的列