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Thread: Problem of getting result than SQL to JTable

  1. #1
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    Default Problem of getting result than SQL to JTable

    hi all.
    i have a program , now i add Operator manager to add new operator and get list of operator or delete
    now Add and Delete is work fine but my ResultSet dont work and give me Null pointer Exeption

    ths code in Operatormanager Class

    public ArrayList<Operator> getlist() throws SQLException, ClassNotFoundException, IllegalAccessException, InstantiationException{
     
            operators = null;
            operator= null;
     
            Command_msg = "SELECT * FROM operator";
            dbmanager.getConn();
            Statement st = dbmanager.conn.createStatement();
            ResultSet res = st.executeQuery(Command_msg); 
            while(res.next()){
                    operator.setName(res.getString("Name")); [COLOR=Red]// here is exeption[/COLOR]
                    operator.setUsername(res.getString("Username"));
                    operator.setPassword(res.getString("Password"));
                    operators.add(operator);
            }
            return operators;
        }

    and this code is in Display class

     OPManager.getlist();
                        int i = 0;
                        for (Core.Operator emp : operators) {
                            Table.setValueAt(emp.getName(), i, 0);
                            Table.setValueAt(emp.getUsername(), i, 1);
                            Table.setValueAt(emp.getPassword(), i, 2);
                            i++;
                           }

    i waiting to your Answer.


  2. #2
    Member leandro's Avatar
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    Default Re: problem in get result than SQL to jtable

    It seems you have a problem with res.getString("Name"). But I need more information to help you. Your ResultSet has the Name attribute?