Mapviewer/JDBC/JGeometry

Question

Hi
I have the Mapviewer java api wrapped in a bean. I want the the user to be able to select a geometry from the map and copy that object into a JGeometry object in the applet. I can easily get the system to identify which object I wish to copy, but how can I read the SDO object into the JGeometry. I know I can do it if I register a new data source in java and then read a record set directly from the database into the JGeom etc, but I don't want the added complication of having to define another data source. Can I reuse the existing connection as defined in the MapViewerConfig.xml and used by mapviewer in the bean? Alternatively is there any other method other than making a second connection to the db?
Thanks
Chris

Answer 1

Hi Chris,
at the java API level you do not have access to the database connection object. But the Java API has some doQuery methods that you may be able to retrieve the geometry as a GML string, and then use some Spatial GML util class to generate the JGeometry. For example:
    String [][]query = mapViewer.doQuery("mvdemo",
             "select state, totpop, SDO_UTIL.TO_GMLGEOMETRY(geom) from states where state_abrv = 'FL'");
     int nlin = 0;
     int ncol = 0;
     String name = null;
     double totPop = 0.;
     if(query != null)
       nlin = query.length;
       ncol = query[0].length;
       for(int i=1;i<nlin;i++)
         name = query[0];
try
totPop = Double.parseDouble(query[i][1]);
} catch (Exception ex)
totPop = 0.;
String geom = query[i][2];
System.out.println("[State] " + name + " [Population] " + totPop +
"\n[Geometry]: " + geom);
// here you can try to use the GML class (I think from sdoutl java library) to generate the JGeometry object
Joao