diagrama de dispersión en jfreechart de la base de datos

Este ejemplo completo crea una tabla de base de datos adecuada en la memoria, la consulta en un JDBCXYDataset y muestra el conjunto de datos en un diagrama de dispersión. Observe cómo la primera columna se convierte en el dominio, mientras que las columnas sucesivas se convierten en series individuales.

import java.awt.EventQueue;
import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Calendar;
import java.util.Random;
import javax.swing.JFrame;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.axis.DateAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.jdbc.JDBCXYDataset;

/**
 * @see http://stackoverflow.com/a/24592754/230513
 */
public class JDBCTest {

    private static final int N = 30;
    private static final Random r = new Random();

    private void display() {
        JFrame f = new JFrame("JDBCTest");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JDBCXYDataset jds = createDataset();
        JFreeChart chart = ChartFactory.createScatterPlot("Inventory",
            "Date", "Count", jds, PlotOrientation.VERTICAL, true, true, false);
        XYPlot plot = chart.getXYPlot();
        plot.setDomainAxis(new DateAxis("Date"));
        f.add(new ChartPanel(chart));
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
        for (int i = 0; i < jds.getItemCount(); i++) {
            System.out.println(new Date(jds.getX(0, i).longValue()));
        }
    }

    private JDBCXYDataset createDataset() {
        try {
            Connection conn = DriverManager.getConnection(
                "jdbc:h2:mem:test", "", "");
            Statement st = conn.createStatement();
            st.execute("create table inventory(when date, n1 integer, n2 integer)");
            PreparedStatement ps = conn.prepareStatement(
                "insert into inventory values (?, ?, ?)");
            Calendar c = Calendar.getInstance();
            for (int i = 0; i < N; i++) {
                ps.setDate(1, new Date(c.getTimeInMillis()));
                ps.setInt(2, N / 3 + r.nextInt(N / 3));
                ps.setInt(3, N / 2 + r.nextInt(N / 3));
                ps.execute();
                c.add(Calendar.MONTH, 1);
            }
            JDBCXYDataset jds = new JDBCXYDataset(conn);
            jds.executeQuery("select when, n1, n2 from inventory");
            return jds;
        } catch (SQLException ex) {
            ex.printStackTrace(System.err);
        }
        return null;
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new JDBCTest().display();
            }
        });
    }
}