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vikas pandey
How to refresh a jTable On adding or deleting record ....
1 Answer(s)      a year and 9 months ago
Posted in : Swing AWT


Hii Sir, I am developing a project in which a jtable is getting populated from database and displayed in panel... Now i have to add records in the database from same panel and i want jtable to be refreshed after every addition of records.... and new record should be showed in the jtable in the panel..

Plz sir give me the code ........ Thank you Sir....


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July 27, 2012 at 5:03 PM


Here is a java swing code that updates the jtable automatically after some interval of time.

import java.sql.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*; 

public class UpdateJTable extends TimerTask {
    private static JTable table = new JTable(); 
    private static Vector columnNames = new Vector();
    private static Vector data = new Vector();
    private static JFrame f = new JFrame();
    private static JScrollPane scrollPane = new JScrollPane();
    public static void main(String[] args) {
        java.util.Timer timer = new java.util.Timer();
        timer.schedule(new UpdateJTable(), 0, 10000);
        } public void run() {
            remove();
            table = draw(); 
            scrollPane.getViewport().add(table, 0); 
            f.getContentPane().add(scrollPane);
            f.setVisible(true);
            f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
            f.pack(); 
            } public static JTable draw() {
                try { Class.forName("com.mysql.jdbc.Driver").newInstance(); 
                Connection con = DriverManager.getConnection( "jdbc:mysql://localhost/test", "root", "root");
                String sql = "Select * from employee"; 
                Statement stmt = con.createStatement(); 
                ResultSet rs = stmt.executeQuery(sql); 
                ResultSetMetaData md = rs.getMetaData(); 
                int columns = md.getColumnCount(); 
                for (int i = 1; i <= columns; i++) {
                    columnNames.addElement(md.getColumnName(i)); }
                    while (rs.next()) {
                        Vector row = new Vector(columns);
                        for (int i = 1; i <= columns; i++) { 
                            row.addElement(rs.getObject(i)); 
                            } data.addElement(row);
                            } rs.close();
                            stmt.close();
                            } 
                            catch (Exception e) {
                                System.out.println(e); 
                                e.printStackTrace(); 
                                } 
                                table.setModel(new DefaultTableModel(data, columnNames));
                                TableColumn col;
                                table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
                                for (int i = 0; i < table.getColumnCount(); i++) {
                                    col = table.getColumnModel().getColumn(i);
                                    col.setMaxWidth(col.getMaxWidth());
                                    } return table;
                                    }
                                    public static void remove() {
                                        columnNames.clear();
                                        if (table.getRowCount() != 0) {
                                            DefaultTableModel dm = (DefaultTableModel) table.getModel();
                                            dm.getDataVector().removeAllElements(); 
                                            }
                                            }
                                            }


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