Displaying columns in JTable

Hi guys,
i'm using 'setDataVector' method to populate my JTable.
JTable table = new JTable();
DefaultTableModel dtm = (DefaultTableModel)table.getModel();
dtm.setDataVector(RowData [][], columnLabels[]);
But in this way it only shows the row data (i.e. the data in the RowData [][] array) but it does not show column values which i have passed in the columnLabels[] array.
Can anybody help me why its not showing the column values or is there any other method which i need to call.
Regards,
Kamran

Try calling setColumnIdentifiers(Object[] newIdentifiers) on the DefaultTableModel:
dtm.setColumnIdentifiers(columnLabels);
If that doesn't work, try firing a TableModelEvent after calling those methods.
Hope this helps!
Barb

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Updating a JTable by hiding/displaying columns

I have a customizable JTable where I display/hide columns according to a users' selection criteria. My code works fine for hiding/displaying columns if the Jtable is opened for the fist time, but doesnot work if I want to hide columns in already displayed table.How do I do it?? Any clue?? I tried
myTabModel.fireTableDataChanged();
but this only works for updating the table data...it does not hide columns for me... when I hide column I just remove desired column like this:
myTable.removeColumn(myTable.getColumn("Column 3"));

Here is the sample code I tried. It worked without any invalidate or repaint or updateUI(). generated using NetBeans
check for <==== for the line of code doing this
* TableTest.java
* Created on October 9, 2002, 1:42 PM
* @author Anki Reddy Nelaturu
public class TableTest extends javax.swing.JFrame {
    /** Creates new form TableTest */
    public TableTest() {
        initComponents();
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
    private void initComponents() {
        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable();
        jButton1 = new javax.swing.JButton();
        jTextField1 = new javax.swing.JTextField();
        menuBar = new javax.swing.JMenuBar();
        fileMenu = new javax.swing.JMenu();
        openMenuItem = new javax.swing.JMenuItem();
        saveMenuItem = new javax.swing.JMenuItem();
        saveAsMenuItem = new javax.swing.JMenuItem();
        exitMenuItem = new javax.swing.JMenuItem();
        editMenu = new javax.swing.JMenu();
        cutMenuItem = new javax.swing.JMenuItem();
        copyMenuItem = new javax.swing.JMenuItem();
        pasteMenuItem = new javax.swing.JMenuItem();
        deleteMenuItem = new javax.swing.JMenuItem();
        helpMenu = new javax.swing.JMenu();
        contentsMenuItem = new javax.swing.JMenuItem();
        aboutMenuItem = new javax.swing.JMenuItem();
        getContentPane().setLayout(null);
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowClosing(java.awt.event.WindowEvent evt) {
                exitForm(evt);
        jTable1.setModel(new javax.swing.table.DefaultTableModel(
            new Object [][] {
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null},
                {null, null, null, null}
            new String [] {
                "Title 1", "Title 2", "Title 3", "Title 4"
        jScrollPane1.setViewportView(jTable1);
        getContentPane().add(jScrollPane1);
        jScrollPane1.setBounds(80, 30, 230, 120);
        jButton1.setText("jButton1");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
        getContentPane().add(jButton1);
        jButton1.setBounds(170, 180, 81, 26);
        jTextField1.setText("jTextField1");
        getContentPane().add(jTextField1);
        jTextField1.setBounds(60, 190, 63, 20);
        fileMenu.setText("File");
        openMenuItem.setText("Open");
        fileMenu.add(openMenuItem);
        saveMenuItem.setText("Save");
        fileMenu.add(saveMenuItem);
        saveAsMenuItem.setText("Save As ...");
        fileMenu.add(saveAsMenuItem);
        exitMenuItem.setText("Exit");
        exitMenuItem.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                exitMenuItemActionPerformed(evt);
        fileMenu.add(exitMenuItem);
        menuBar.add(fileMenu);
        editMenu.setText("Edit");
        cutMenuItem.setText("Cut");
        editMenu.add(cutMenuItem);
        copyMenuItem.setText("Copy");
        editMenu.add(copyMenuItem);
        pasteMenuItem.setText("Paste");
        editMenu.add(pasteMenuItem);
        deleteMenuItem.setText("Delete");
        editMenu.add(deleteMenuItem);
        menuBar.add(editMenu);
        helpMenu.setText("Help");
        contentsMenuItem.setText("Contents");
        helpMenu.add(contentsMenuItem);
        aboutMenuItem.setText("About");
        helpMenu.add(aboutMenuItem);
        menuBar.add(helpMenu);
        setJMenuBar(menuBar);
        pack();
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        jTable1.removeColumn(jTable1.getColumnModel().getColumn(Integer.parseInt(jTextField1.getText())));        // <========
    private void exitMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
        System.exit(0);
    /** Exit the Application */
    private void exitForm(java.awt.event.WindowEvent evt) {
        System.exit(0);
     * @param args the command line arguments
    public static void main(String args[]) {
        new TableTest().show();
    // Variables declaration - do not modify
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JMenu fileMenu;
    private javax.swing.JMenuItem exitMenuItem;
    private javax.swing.JButton jButton1;
    private javax.swing.JMenuItem saveAsMenuItem;
    private javax.swing.JMenuItem saveMenuItem;
    private javax.swing.JMenuItem copyMenuItem;
    private javax.swing.JMenuItem pasteMenuItem;
    private javax.swing.JMenuItem cutMenuItem;
    private javax.swing.JMenuItem openMenuItem;
    private javax.swing.JMenuBar menuBar;
    private javax.swing.JMenu editMenu;
    private javax.swing.JMenuItem aboutMenuItem;
    private javax.swing.JMenuItem contentsMenuItem;
    private javax.swing.JMenu helpMenu;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JMenuItem deleteMenuItem;
    private javax.swing.JTable jTable1;
    // End of variables declaration
}

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I want to display the sum of two columns of Jtable in a text box, just as we use to do in Forms developer.
How is this possible in Jclient.
I would be glad if someone can give a detail info about it.

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Does anyone know how to display Columns from a WBS and an Activity together so that they can be output to Excel?
I need WBS Code, Actual Start, Actual Finish and Performance % Complete from the WBS and Activity Codes from Activities.
I can produce them in a report but this gives me all the activities in a heirarchical format which then necessitates deleting the activity lines in Excel
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Edited by: user9088233 on Feb 3, 2010 11:50 PM

user9088233,
Your request interested me so I gave it the old college try. There are several ways to go about this task but here's one that is fairly quick and easy.
I carefully read your description of what you need from P6. I've built a test layout using the fields that you outlined. Here's what I came up with. This should bypass the issue of having to create a P6 export. My solution is to build a customized layout in P6 and copy that info and paste it into an Excel spreadsheet.+
Open P6
Open neccessary projects & open a new layout containing these columns:
....Project, WBS,Activity ID, Activity Name, Perf. %, & (any codes or user defined codes)
Group & Sort by: Project, WBS
....*Display Options* = "Show Group Totals" & "Show Summaries Only", Choose "OK"
....*Edit*, Select, All, Copy
Open Excel
....Paste Highlighted data into your new worksheet.
Hope this helps but it's usually hard to understand exactly what you need unless I can view your data,
Good Luck & let me know how it turns out,
p3_scheduler
Edited by: p3_scheduler on Feb 8, 2010 2:40 PM

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Tia,
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dayanandabv wrote:
[http://search.sun.com/search/onesearch/index.jsp?qt=hide+column%2B+JTable&rfsubcat=&col=developer-forums]
My thought exactly.
db

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EXPORTING
    IT_FIELDCATALOG           = Y_I_FCAT
IMPORTING
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IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
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ENDIF.
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For ex.
Col1 Col2 Col3 Col4
A       A       A      A
A       A       A      B
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please refer this thread for similar kind of discussion...
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Please refer to the first reply of [this thread|http://forums.sun.com/thread.jspa?forumID=57&threadID=571445] for the answer. If you have a specific problem implementing it, post you code with a specific question.

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Help me please!
A try to remove column from JTable. It's removed, but when I try to add column in table, then I get all old (removed early) columns + new column....
I completely confused with it.....
Here is my code for remove column:
class DelC implements ActionListener
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My brain is boiled, I've try a lot of variants of code, but did't get right result :((
It's code represent problem, which I've describe above. If you'll try remove column and then add it again, it will be ma-a-a-any colunms...
I understand, that my code just hide columns, not delete from table model....
But now I have not any decision of my problem...
Thanks a lot for any help. :)
import javax.swing.*;
import java.awt.*;
import javax.swing.table.*;
import java.awt.event.*;
import javax.swing.table.DefaultTableModel;
class JTableF extends JFrame
     Object [] [] data = new Object [0] [2];
     JTable table;
     DefaultTableModel model;
     String [] columnNames = {"1", "2"};
     TableColumnModel cm;
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          JMenuItem [] menu1 = {new JMenuItem("Add row"), new JMenuItem("Delete row", 'D'), new JMenuItem("Add column"), new JMenuItem("Delete column")};
          menu1 [ 0 ].addActionListener(new AddL());
          menu1 [ 1 ].addActionListener(new DelL());
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          for (int i=0; i<menus.length; i++)
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          table = new JTable (model);
          cm = table.getColumnModel();
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          JButton b = new JButton ("Add row button");
          b.addActionListener(new AddL());
          panel.add (b);
          setJMenuBar (MBar);
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               model.addRow ( Row );
     class DelL implements ActionListener
          public void actionPerformed (ActionEvent e)
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               if (HowManyRowsDelete.length !=0)
                    for (int k = HowManyRowsDelete.length-1; k>-1; k--)
                         model.removeRow (HowManyRowsDelete[k]);
               else
                    JOptionPane.showMessageDialog(JOptionPane.getRootFrame(), "Row is not selected!");
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I want to get Key board access for a column in JTable.
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Hi,
In addition to setting DO_SUM = 'X' you need to specify function in H_FTYPE field. It should be set to 'AVG' in your case.
ls_fielcat-do_sum = 'X'.
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Display column value as column name

Hi,
I have a requirement to display column names as column values and vice versa. Pls suggest how to do this.
Test data
create table oratest as select 'saurabh' "name",23 "age" from dual;
SQL> select * from oratest;
name           age
saurabh         23Expected output
saurabh         23
name           age

Ok, I've only got 10g here at the minute, so this is what I'd do...
SQL> ed
Wrote file afiedt.buf
1 DECLARE
2    v_v_val     VARCHAR2(4000);
3    v_n_val     NUMBER;
4    v_d_val     DATE;
5    v_ret       NUMBER;
6    c           NUMBER;
7    d           NUMBER;
8    col_cnt     INTEGER;
9    f           BOOLEAN;
10    rec_tab     DBMS_SQL.DESC_TAB;
11    col_num     NUMBER;
12    v_rowcount NUMBER := 0;
13    v_name      VARCHAR2(20);
14    v_age       NUMBER;
15    v_sql       VARCHAR2(4000);
16    v_str       VARCHAR2(250);
17    v_und       VARCHAR2(250);
18 BEGIN
19    select "name", "age"
20    into   v_name, v_age
21    from   oratest;
22    v_sql := 'SELECT ''name'' as "'||v_name||'", ''age'' as "'||v_age||'" from dual';
23    c := DBMS_SQL.OPEN_CURSOR;
24    DBMS_SQL.PARSE(c, v_sql, DBMS_SQL.NATIVE);
25    d := DBMS_SQL.EXECUTE(c);
26    DBMS_SQL.DESCRIBE_COLUMNS(c, col_cnt, rec_tab);
27    --
28    -- Bind local return variables to the various columns based on their types
29    FOR j in 1..col_cnt
30    LOOP
31      CASE rec_tab(j).col_type
32        WHEN 1 THEN DBMS_SQL.DEFINE_COLUMN(c,j,v_v_val,2000); -- Varchar2
33        WHEN 2 THEN DBMS_SQL.DEFINE_COLUMN(c,j,v_n_val);      -- Number
34        WHEN 12 THEN DBMS_SQL.DEFINE_COLUMN(c,j,v_d_val);     -- Date
35      ELSE
36        DBMS_SQL.DEFINE_COLUMN(c,j,v_v_val,2000); -- Any other type return as varchar2
37      END CASE;
38    END LOOP;
39    -- Display the header
40    FOR j in 1..col_cnt
41    LOOP
42      v_str := v_str || rpad(rec_tab(j).col_name,30,' ')||' ';
43      v_und := v_und || rpad('-',30,'-')||' ';
44    END LOOP;
45    v_str := rtrim(v_str);
46    v_und := rtrim(v_und);
47    DBMS_OUTPUT.PUT_LINE(v_str);
48    DBMS_OUTPUT.PUT_LINE(v_und);
49    --
50    -- This part outputs the DATA
51    v_str := '';
52    LOOP
53      v_ret := DBMS_SQL.FETCH_ROWS(c);
54      EXIT WHEN v_ret = 0;
55      v_rowcount := v_rowcount + 1;
56      FOR j in 1..col_cnt
57      LOOP
58        CASE rec_tab(j).col_type
59          WHEN 1 THEN DBMS_SQL.COLUMN_VALUE(c,j,v_v_val);
60                       v_str := v_str||rpad(v_v_val,30,' ')||' ';
61          WHEN 2 THEN DBMS_SQL.COLUMN_VALUE(c,j,v_n_val);
62                       v_str := v_str||lpad(to_char(v_n_val,'fm999999999999'),30,' ')||' ';
63          WHEN 12 THEN DBMS_SQL.COLUMN_VALUE(c,j,v_d_val);
64                       v_str := v_str||rpad(to_char(v_d_val,'DD/MM/YYYY HH24:MI:SS'),30,' ')||' ';
65        ELSE
66          DBMS_SQL.COLUMN_VALUE(c,j,v_v_val);
67          v_str := v_str||rpad(v_v_val,30,' ')||' ';
68        END CASE;
69      END LOOP;
70      v_str := rtrim(v_str);
71      dbms_output.put_line(v_str);
72    END LOOP;
73    DBMS_SQL.CLOSE_CURSOR(c);
74* END;
SQL> /
saurabh                        23
name                           age
PL/SQL procedure successfully completed.
SQL>Now, with 11g you can actuall create the DBMS_SQL cursor from the top part of the code...
18 BEGIN
19    select "name", "age"
20    into   v_name, v_age
21    from   oratest;
22    v_sql := 'SELECT ''name'' as "'||v_name||'", ''age'' as "'||v_age||'" from dual';
23    c := DBMS_SQL.OPEN_CURSOR;
24    DBMS_SQL.PARSE(c, v_sql, DBMS_SQL.NATIVE);And using the new function in 11g's DBMS_SQL package called dbms_sql.to_refcursor and convert the DBMS_SQL cursor to a REF CURSOR which you can then use in your applications (if that's the way you need to go)...
http://www.oracle.com/technology/oramag/oracle/07-nov/o67asktom.html
Whatever route you take though, you won't do this simply in SQL as the column names of a query are required to be known before any data is retrieved when a query (cursor) executes. You can see that when you use the DBMS_SQL package, where the query has to be parsed and the column names and descriptions are determined before any fetching of data.

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import java.awt.event.*;
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          catch (Exception e){}
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This might be dumb question. But why do get this error with a IR report? and what is the solution for this. Please help me with this.
Error
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Oh.. And also i have a blob column.. if the format is not given, then the table is fine.. but happen to get this error only when the blob download format is given.
Thanks and regards
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Edited by: JB on Mar 30, 2012 11:08 AM

Hi,
i have set up a small test case on apex.oracle.com and I receive the same error if I use download format.
I have a table
test_blob (id number, name varchar2(10), blobcont blob)
If I create IR like
select
    id,
    name,
    blobcont
from test_bloband then I define download format I hit the error.
If you want this to work you have to change your query to
select
    id,
    name,
    dbms_lob.getlength(blobcont) blobcont
from test_blobAnd then again define download format for blob on blobcont column.
Regards,
Aljaz

Displaying columns in JTable

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