Question

I have a database and a Java Program. I am trying to write a code, so that if in a textfield a MockID is entered, and the submit button is pressed, the details according to that entered Mock ID should be retrieved from the database and displayed in a textarea. below is the code that i have written. The code now works after amendments i have made. However, in the textarea, its not actually displaying the relevant information from that record for the given Mock Id, but just text.
Could someone please advise ?

    JButton button = new JButton("Submit");
    button.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent arg0) {


        String mockId = textField.getText();    

        try {

            String sql = "SELECT MockID, Subject, Year, Date FROM mockexam WHERE MockID =?";    

            PreparedStatement prest = con.prepareStatement(sql);
            prest.setString(1, mockId);

            prest.executeQuery();
            textArea.append("MockID, Subject, Year, Date");
            JOptionPane.showMessageDialog(frmFindMock, "Record has been updated.");


        }

        catch (SQLException e) {
        //System.out.println("Record couldn't be added!");
        e.printStackTrace();
        JOptionPane.showMessageDialog(frmFindMock, "Record couldn't be updated. Please try again.");
        }
        }

        });

    button.setBounds(303, 60, 75, 23);
    panel_1.add(button);

Answer 1

The ? is the bind variable placeholder. you only have 1. so why are you trying to bind 4 things?