Wsrtjtyk

I need to display the details of students in a particular stream of a schoolclass in Jtable from a database containing all the names of students in the school. I have two jComboboxes, on to select which class and the other to select the stream. I am asking for a way to define these two conditions in order to display all the students in a particular stream in a jtable. I apologize in advance if my code is messy.

public Classes() {

    initComponents();

    show_student();

}    



public Connection getConnection() {

    Connection con = null;



    try {

        con = DriverManager.getConnection("jdbc:mysql://localhost:3306/sms", "root", "");

    } catch(Exception e) {

        JOptionPane.showMessageDialog(null, e.getMessage());

    }

    return con;

}



public ArrayList<Individualclass> studentList(String ValToSearch) {

    ArrayList<Individualclass> list = new 

    ArrayList<Individualclass>();



    Statement st;

    ResultSet rs;



    try {

        Connection con=getConnection();

        st = con.createStatement();

        String searchQuery = "SELECT * FROM `students` WHERE CONCAT(`firstName`, `surname`, `otherNames`, `regNo`) LIKE '%"+ValToSearch+"%'";

        rs = st.executeQuery("searchQuery ");



        Individualclass ic;



        while(rs.next()) {

            ic = new Individualclass(

                    rs.getString("firstName"),

                    rs.getString("surname"),

                    rs.getString("otherNames"),

                    rs.getInt("regNo")        



            );

            list.add(ic);

        }

    } catch(Exception ex){

        JOptionPane.showMessageDialog(null, ex.getMessage());

    }

    return list;

}



public void findStudents() {



}   



private void sClassActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_sClassActionPerformed

    try {

        Connection con = getConnection();

        String fetch_row = "SELECT * FROM students where sClass=?";

        PreparedStatement pst = con.prepareStatement(fetch_row);

        pst.setString(1, (String) sClass.getSelectedItem());

        ResultSet rs = pst.executeQuery();



        while(rs.next()) {

            Individualclass ic = new Individualclass(rs.getString("firstName"),rs.getString("surname"),rs.getString("otherNames"),rs.getInt("regNo"));

        }

    } catch(Exception ex) {

        JOptionPane.showMessageDialog(null, ex.getMessage());

    }

}//GEN-LAST:event_sClassActionPerformed



private void streamActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_streamActionPerformed

    try {

        Connection con = getConnection();

        String fetch_row = "SELECT * FROM students where stream=?";

        PreparedStatement pst = con.prepareStatement(fetch_row);

        pst.setString(1, (String)stream.getSelectedItem());

        ResultSet rs = pst.executeQuery();



        while(rs.next()) {

            Individualclass ic = new Individualclass(rs.getString("firstName"),rs.getString("surname"),rs.getString("otherNames"),rs.getInt("regNo"));

        }

    } catch(Exception ex) {

        JOptionPane.showMessageDialog(null, ex.getMessage());

    }

}//GEN-LAST:event_streamActionPerformed



public void show_student() {

    ArrayList<Individualclass> list = new ArrayList<Individualclass>();

    DefaultTableModel model =  (DefaultTableModel)jTable_Display_Student.getModel();

    Object  row = new Object[13];

    for(int i = 0; i < list.size(); i++) {

        row[0] = list.get(i).getFirstName();

        row[1] = list.get(i).getsurname();

        row[2] = list.get(i).getOtherNames();

        row[3] = list.get(i).getregNo();



        model.addRow(row);

    }

}