JComboBox Help!

Question

Hi All,
can anyone show me some good examples of how to fill up one combo Box with all the table names in a database, and when I select a table display all the column names in the another combo Box.
Thanks
Dave

Answer 1

This is basically what you want, except it updates a table instead of a JComboBox:
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;
public class DatabaseInformation extends JFrame implements ActionListener
    DatabaseMetaData dmd;
    ResultSet rs;
    ResultSetMetaData md;
    int columns;
    JComboBox comboBox;
    JTable table;
    String catalog;
    public DatabaseInformation()
        Vector columnNames = new Vector();
        Vector data = new Vector();
        try
            //  Connect to the Database
            String driver = "sun.jdbc.odbc.JdbcOdbcDriver";
//            String url = "jdbc:odbc:someDSN";  // if using ODBC Data Source name
            String url = "jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};DBQ=c:/somedirectory/somdatabase.mdb";
            String userid = "";
            String password = "";
            Class.forName( driver );
            Connection connection = DriverManager.getConnection( url, userid, password );
            dmd = connection.getMetaData();
            //  Get the first Catalog
            rs = dmd.getCatalogs();
            if (rs.next())
                catalog = rs.getObject(1).toString();
                System.out.println( catalog );
            rs.close();
            //  Get Tables
            comboBox = new JComboBox();
            rs = dmd.getTables(catalog, null, null, new String[] { "TABLE" });
            md = rs.getMetaData();
            columns = md.getColumnCount();
            while (rs.next())
                   comboBox.addItem( rs.getObject(3) );
            rs.close();
        catch(Exception e)
            System.out.println( e );
        comboBox.addActionListener( this );
        getContentPane().add(comboBox, BorderLayout.NORTH);
        //  Create table with database data
        table = new JTable();
        JScrollPane scrollPane = new JScrollPane( table );
        getContentPane().add( scrollPane );
    public void actionPerformed(ActionEvent e)
        String table = (String)comboBox.getSelectedItem();
        displayTableColumns( table );
    private void displayTableColumns(String tableName)
        try
            //  Get Columns
            rs = dmd.getColumns(catalog, null, tableName, null);
            md = rs.getMetaData();
            int columns = md.getColumnCount();
            Vector columnNames = new Vector(columns);
            Vector data = new Vector();
            //  Get column names
            for (int i = 1; i <= columns; i++)
                columnNames.addElement( md.getColumnName(i) );
            //  Get row data
            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();
            //  Reset Table
            DefaultTableModel model = new DefaultTableModel(data, columnNames);
            table.setModel( model );
        catch(Exception e)
            System.out.println( e );
    public static void main(String[] args)
        DatabaseInformation frame = new DatabaseInformation();
        frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
        frame.pack();
        frame.setVisible(true);
}