ObjectDB for Java/JDO Demo package directory.step1

Step 1 demonstrates using JDO to create a new database and to store an initial object graph.

directory/step1/eMain.java

// ObjectDB for Java Demo - JDO Directory - A Brief JDO Tutorial // Copyright (C) 2001-2003, ObjectDB Software. All rights reserved. package directory.step1; /** * A main class for Step 1 of the Directory Demo. * * This class ensures that all the persistence capable classes will be enhanced * at runtime just before they are being loaded into the JVM. * To make it work - NO PERSISTENCE CAPABLE CLASS IS MENTIONED IN THIS CLASS! * (otherwise non enhanced versions of the classes might be loaded into JVM). */ public class eMain { public static void main(String[] args) { // Enhance the persistence capable classes when necessary: com.objectdb.Enhancer.enhance("directory.pc.*"); // Now run the example: new InitDB().run(); } }

directory/step1/InitDB.java

// ObjectDB for Java Demo - JDO Directory - A Brief JDO Tutorial // Copyright (C) 2001-2003, ObjectDB Software. All rights reserved. package directory.step1; import javax.jdo.*; import directory.pc.*; /** * The InitDB class shows how to create a new database and how to store * an object graph into the database. */ public class InitDB { /** * Runs the example. */ public void run() { // Obtain a PersistenceManager instance: PersistenceManager pm = directory.Utilities.getPersistenceManager(true); // Store an object graph into the database: try { insertObjects(pm); System.out.println("Database is ready now..."); } catch (RuntimeException x) { System.out.println("Error: " + x.getMessage()); } // Close the PersistenceManager instance: finally { if (pm.currentTransaction().isActive()) pm.currentTransaction().rollback(); if (!pm.isClosed()) pm.close(); } } /** * Stores an object graph into the database. */ public static void insertObjects(PersistenceManager pm) { // Construct the "Consulting & Training" category and items: Category consulting = new Category("Consulting & Training"); consulting.add(new Item("Barry and Associates", "http://www.service-architecture.com")); consulting.add(new Item("C2B2 Consulting", "http://www.c2b2-consulting.co.uk/jdo.php")); consulting.add(new Item("Object Identity", "http://www.objectidentity.com")); consulting.add(new Item("Ogilvie Partners", "http://www.ogilviepartners.com/JdoEvents.html")); consulting.add(new Item("Smart Soft", "http://www.smart-soft.com")); // Construct the "Books" category and items: Category books = new Category("Books"); books.add(new Book("Java Data Objects", 264, "http://www.ogilviepartners.com/JdoBook.html", "Robin Roos", "0321123808", "Addison-Wesley", 2002, 8)); books.add(new Book("Java Data Objects", 384, "http://www.oreilly.com/catalog/jvadtaobj", "David Jordan and Craig Russell", "0596002769", "O'Reilly & Associates, Inc.", 2003, 4)); books.add(new Book("Using and Understanding Java Data Objects", 312, "http://www.apress.com/book/bookDisplay.html?bID=106", "David Ezzio", "1590590430", "Apress", 2003, 4)); books.add(new Book("Core JDO Book", 256, "http://www.theserverside.com/resources/coreJDOreview.jsp?news49", "K. McCammon, H. Bobzin, S. Tyagi and M. Vorburger", "0131407317", "Sun Press and Prentice Hall", 2003, 5)); // Construct the root category: Category root = new Category("JDO Directory"); root.add(consulting); root.add(books); // Store the object graph into the database: pm.currentTransaction().begin(); pm.makePersistent(root); // store the entire object graph pm.currentTransaction().commit(); } }