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Thread: jTable trouble...

  1. #1
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    Default jTable trouble...

    If I have a jTable that is populated with data when the program begins, and people can "Add" button, "Delete" button, and there is a "Refresh" button (part of the issue, this is used to re-populate the jTable). How do I completely erase all data in the jTable and get the focus to be at row 0 and col 0 again?


    I've tried going through the thing and doing a .setValueAt("", row, col); but cant figure out how to reset the "cursor" to be at that 0,0 spot?


  2. #2
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    Default Re: jTable trouble...

    Perhaps post some code (preferably SSCCE form), which might help demonstrate how you are using the JTable. If you just wish to reset the selection, alter the selectionmodel
    table.getSelectionModel().setSeletionInterval(0,0);

  3. #3
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    Default Re: jTable trouble...

    (I was currently looking into possibly using the DefaultTableModel better so I could just repaint() the damn thing easy but it is extremely hard to complete using NetBeans and there is a lack of documentation on exactly how to do it with NetBeans.)

    Anywho... this is my Refresh button -
        private void btnRefreshActionPerformed(java.awt.event.ActionEvent evt) {                                           
     
     
            doDelete();
        }                                          
     
    public void doDelete(){
        int i = 0;
        int r = 0;
     
        while (i < 600) {
            jTable1.remove(r);
     
            r++;i++;
        }
            doRefresh();
        }
     
     public void doRefresh(){
     
                try {
                String url = "jdbc:odbc:dts";
                String user = "";
                String password = "";
                Connection con = DriverManager.getConnection(url, user, password);
     
                String getCust = "SELECT *  FROM Customer";
                PreparedStatement ps = con.prepareStatement(getCust);
                ResultSet rs = ps.executeQuery();
     
                while (rs.next()){
                    String s = rs.getString(1);
                    jTable1.setValueAt(s, R, 0);
                    s = rs.getString(2);
                    jTable1.setValueAt(s, R, 1);
                    s = rs.getString(3);
                    jTable1.setValueAt(s, R, 2);
                    s = rs.getString(4);
                    jTable1.setValueAt(s, R, 3);
                    s = rs.getString(5);
                    jTable1.setValueAt(s, R, 4);
                    s = rs.getString(6);
                    jTable1.setValueAt(s, R, 5);
                    s = rs.getString(7);
                    jTable1.setValueAt(s, R, 6);
                    s = rs.getString(8);
                    jTable1.setValueAt(s, R, 7);
                    R++;
     
     
               }
     
            } catch (Exception e) {
                lblConnect.setText("Error in doRefresh()");
            }
    }
    This is my Delete button -
       private void btnDeleteActionPerformed(java.awt.event.ActionEvent evt) {                                          
     
            int row = jTable1.getSelectedRow();
     
            String value = (String)jTable1.getValueAt(row, 0);
            try{
                String url = "jdbc:odbc:dts";
                String user = "";
                String password = "";
                Connection con = DriverManager.getConnection(url, user, password);
            if ( row >= 0 ){
     
            String delCust = "DELETE FROM Customer WHERE FirstName = ?";
            PreparedStatement ps = con.prepareStatement(delCust);
            ps.setString(1, value);
            ps.executeUpdate();
                }
     
           }// end try
            catch(Exception e){
                lblConnect.setText("Failed to delete entry");
            }
     
        }

    The main issue:

    If I have two entries in the Database (displayed in the jTable) and I click one, and press Delete, it deletes it from the database without making any visual impact into the jTable, then you click Refresh, and it simply appends (to the bottom of the two other entries) the one that wasn't deleted(because it is now the only entry in the DB)


    I just can't figure out how to simply completely erase all data in the jTable and reset it to start putting in data starting at row 0 col 0.

    I tried your code you said to try and it gave me and error with the ".setSeletionInterval(0,0);" portion of it saying it couldn't find the Symbol: method setSelectionInterval(int, int);



    :EDIT: in the event of me messing with some coding, it currently doesn't do any refreshing at all right now and changes arent made until the program restarts
    Last edited by _lithium_; March 6th, 2011 at 11:51 AM.

  4. #4
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    Default Re: jTable trouble...

    Ok, I've decided to switch how I store the data for the jTable, but no im running into a shit ton of issues. When I call my getData() it says "Overridable method call in constructor" then when I try to run the program, it says an error with "init" which i see is from the initComponents()... here is the code im messing with, please i need help before I die from overworking on this lol:
    public class DeedsTechView extends FrameView{
    int R = 0;
          String header[] = new String[]{
                "First Name", "Last Name","Address", "City","State","Zip","Phone", "Email"
            };
     
    private Vector<Vector<String>> data; //used for data from database
     
     
        public DeedsTechView(SingleFrameApplication app) {
     
            super(app);
            initComponents();
            try{
               String url = "jdbc:odbc:dts";
                String user = "";
                String password = "";
                Connection con = DriverManager.getConnection(url, user, password);
                String getCust = "SELECT *  FROM Customer";
                PreparedStatement ps = con.prepareStatement(getCust);
                ResultSet rs = ps.executeQuery();
                data = getData(con, rs);
     
            }
            catch(Exception e){
                System.out.println("Still crasssshinnngg!");
            }
     
     
     
        }
     
     
     
     
        @Action
        public Vector getData(Connection con, ResultSet rs){
            Vector<Vector<String>> customerData = new Vector<Vector<String>>();
               try{
                while (rs.next()){
                    Vector<String> customer = new Vector<String>();
                    customer.add(rs.getString(1));
                    customer.add(rs.getString(2));
                    customer.add(rs.getString(3));
                    customer.add(rs.getString(4));
                    customer.add(rs.getString(5));
                   customer.add(rs.getString(6));
                    customer.add(rs.getString(7));
                    customer.add(rs.getString(8));
                    customerData.add(customer);
                }
                return customerData;
            }
               catch (Exception e){
                   System.out.print("ERROR IN getData()");
                   return null;
               }
     
            }

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