APPENDIX A n MORE ADVANCED FEATURES 241 n (Web host server)
APPENDIX A n MORE ADVANCED FEATURES 241 n MORE ADVANCED FEATURES 241 System.out.println(”Preparing the Session objects”); Session session = sessionFactory.openSession(); Session xmlSession = session.getSession(EntityMode.DOM4J); System.out.println(”Reading the catalog from the database”); session.beginTransaction(); export(xmlSession,root,”from User”); export(xmlSession,root,”from Advert”); export(xmlSession,root,”from Category”); session.getTransaction().commit(); session.close(); System.out.println(”Dumping the catalog to a file”); BufferedWriter writer = new BufferedWriter(new FileWriter(”catalog.xml”)); document.write(writer); writer.flush(); writer.close(); System.out.println(”Done.”); } public static void export(Session xmlSession,Element root,String hql) { Query query = xmlSession.createQuery(hql); List categories = query.list(); Iterator cit = categories.iterator(); while(cit.hasNext()) { Element element = (Element)cit.next(); root.add(element); } } } The code in Listing A-8 generates the catalog.xml file shown in Listing A-9. Note how the node attributes in the mapping file correspond to the positions of the elements and attributes in the exported XML file. Note also how setting the embed-xml attribute to false substitutes the id value for the generated XML in the elements at the catalog/category/advert path. Listing A-9. The XML Exported by Hibernate
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