DISPLAY SPATIAL DATA USING JDBC ON A JAVA FRAME

Question

I am trying to set up some spatial data and need help in getting some sample
code for displaying the data on a Java Frame using JDBC.
The shapes I am setting up are simple polygons, lines, circles. I was going
through the samples in the demo directory under $ORACLE_HOME/md/demo/examples, but could not find any JDBC
I would really appreciate if you can point me towards some sample code and any other spatial resources.
Madhukar

Answer 1

Here you go. It uses JDBC to fetch geoms, convert them into Java JGeometry objects, which then create Java2D shapes (these are functions of the public sdoapi.jar library). It then uses some class in the sdovis.jar library (the rendering engine of MapViewer) to setup the necessary viewport transform. If you know how to setup the viewport transform, then you dont even need sdovis. sdovis.jar is found in an deployed MapViewer's WEB-INF/lib directory. Or you can extract it from the mapviewer.ear's web.war file.
import java.awt.*;
import java.awt.geom.*;
import java.awt.event.*;
import java.awt.image.*;
import java.sql.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;
import oracle.jdbc.OracleDriver;
import oracle.sdovis.*;
import oracle.sdovis.style.*;
import oracle.sdovis.util.*;
import oracle.spatial.geometry.JGeometry;
import oracle.sql.STRUCT;
* A very simple program that shows stuff from db in a JFrame
* <p>
public class tilsvgui2 extends JFrame
  final static int mapWidth  = 640;
  final static int mapHeight = 480;
  static JSDOGeometry geom = null;
  public tilsvgui2()
    setSize(mapWidth+40, mapHeight+40);
                setVisible(true);
    this.addWindowListener(new java.awt.event.WindowAdapter() {
      public void windowClosing(WindowEvent e) { System.exit(0); }
        public void paint(Graphics g)
                super.paint(g);
    int w = this.getWidth(), h = this.getHeight();
    Insets inset = this.getInsets();
    double[] mbr = geom.getMBR();
    //from sdovis; it will setup the viewport transform
    XFViewPort xfp = new XFViewPort();
    xfp.setDeviceView(inset.left, inset.top, w-inset.left-inset.right-1, h-inset.top-inset.bottom-1);
    xfp.setDataView(mbr[0], mbr[1], mbr[2], mbr[3]);
    AffineTransform af = xfp.getAffineTransform();    //get the viewport transform
    Shape shp = geom.createShape(af);    //create a proper shape that fits the viewport
    Graphics2D g2 = (Graphics2D) g;
    g2.setColor(Color.red);
    g2.drawRect(inset.left, inset.top, w-inset.left-inset.right-1, h-inset.top-inset.bottom-1);
    //draw the shape itself
    g2.setColor(Color.blue);
    g2.draw(shp);
  public static void getStuff() throws Exception
    System.out.println("Loading geometry...");
    Connection conn = getConnection("mapsrus.us.oracle.com", "1521", "orcl", "scott", "tiger");
    Statement  stmt = conn.createStatement();
    ResultSet  rset = stmt.executeQuery("select geom, totpop from counties where county='Merrimack' and state_abrv='NH'");
    while(rset.next())
      STRUCT st = (STRUCT) rset.getObject(1);
      geom = JSDOGeometry.loadFromDB(st);
      int population = rset.getInt(2);
      break; //displaying only the first geometry
    rset.close();
    stmt.close();
    conn.close();
  private static Connection getConnection(String host,
                                          String port,
                                          String sid,
                                          String username,
                                          String password)
    throws SQLException
    String thinConn = "jdbc:oracle:thin:@"+host+":"+port+":"+sid;
    Driver d = new OracleDriver();
    Connection conn = DriverManager.getConnection(thinConn,username,password);
    conn.setAutoCommit(false);
    return conn;
  public static void main(String[] args)
    try{
      getStuff();
    }catch(Exception e)
      e.printStackTrace(System.err);
    new tilsvgui2();
}