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/**
* <copyright>
*
* Copyright (c) 2005, 2006 Springsite BV (The Netherlands) and others
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Martin Taal
* </copyright>
*
* $Id: Tutorial1.java,v 1.5 2006/11/13 21:55:11 mtaal Exp $
*/
package jpoxtutorial;
import java.io.IOException;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.Properties;
import javax.jdo.Extent;
import javax.jdo.PersistenceManager;
import javax.jdo.Query;
import javax.jdo.Transaction;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.example.library.Book;
import org.eclipse.example.library.BookCategory;
import org.eclipse.example.library.Library;
import org.eclipse.example.library.LibraryFactory;
import org.eclipse.example.library.LibraryPackage;
import org.eclipse.example.library.Writer;
import org.eclipse.example.library.impl.BookImpl;
import org.eclipse.example.library.impl.LibraryImpl;
import org.eclipse.example.library.impl.WriterImpl;
import org.eclipse.emf.teneo.jpox.JpoxDataStore;
import org.eclipse.emf.teneo.jpox.JpoxHelper;
import org.eclipse.emf.teneo.jpox.resource.JPOXResourceDAO;
import org.jpox.PMFConfiguration;
/**
* Tutorial
*
* @author <a href="mailto:mtaal@elver.org">Martin Taal</a>
* @version $Revision: 1.5 $
*/
public class Tutorial1 {
/**
* @param args
*/
public static void main(String[] args) {
// At this position you can add your own specific types for jpox
// This should be done before creating the persistence manager factory, e.g.
// TypeManager.getTypeManager().addType(MyNiceType.class.getName(), MyNiceTypeMapping.class,
// MyNiceTypeWrapper.class);
// set the database connection info, PMFConfiguration is org.jpox.PMFConfiguration
Properties properties = new Properties();
properties.setProperty(PMFConfiguration.JDO_DATASTORE_DRIVERNAME_PROPERTY, "com.mysql.jdbc.Driver");
properties.setProperty(PMFConfiguration.JDO_DATASTORE_URL_PROPERTY, "jdbc:mysql://127.0.0.1:3306/mylibrary");
properties.setProperty(PMFConfiguration.JDO_DATASTORE_USERNAME_PROPERTY, "root");
properties.setProperty(PMFConfiguration.JDO_DATASTORE_PASSWORD_PROPERTY, "root");
// create/register the JpoxDataStore, set the db props and the epackages to persist, initialize creates
// the database
String pmfName = "MyPMF"; // the name of the JpoxDataStore
JpoxDataStore jpoxDataStore = JpoxHelper.INSTANCE.createRegisterDataStore(pmfName);
jpoxDataStore.setProperties(properties);
jpoxDataStore.setEPackages(new EPackage[] { LibraryPackage.eINSTANCE });
jpoxDataStore.initialize();
// create a persistence manager and a transaction
PersistenceManager pm = jpoxDataStore.getPMF().getPersistenceManager();
Transaction tx = pm.currentTransaction();
// start a transaction, create a library and make it persistent
tx.begin();
Library lib = LibraryFactory.eINSTANCE.createLibrary();
lib.setName("My Library");
pm.makePersistent(lib);
// create a writer
Writer writer = LibraryFactory.eINSTANCE.createWriter();
writer.setName("JRR Tolkien");
// and one of his books
Book book = LibraryFactory.eINSTANCE.createBook();
book.setAuthor(writer);
book.setPages(305);
book.setTitle("The Hobbit");
book.setCategory(BookCategory.SCIENCE_FICTION_LITERAL);
// add the writer/book to the library. The writer and book are automatically
// made persistent because they are added to the library which is already
// made persistent
lib.getWriters().add(writer);
lib.getBooks().add(book);
// at commit the objects will be present in the database
tx.commit();
pm.close(); // empty the cache
// at this point the database contains one library, one book and one writer
// Reopen the transaction and query for the library objects
pm = jpoxDataStore.getPMF().getPersistenceManager();
tx = pm.currentTransaction();
tx.begin();
// NOTE: here you see one drawback of the current JPOX implementation:
// for querying you require the concrete implementation instead of the
// interface!
// retrieve all LibraryImpl classes and subclasses.
Extent e = pm.getExtent(LibraryImpl.class, true);
Query q = pm.newQuery(e);
// there is only one library
Collection c = (Collection) q.execute();
lib = (Library) c.iterator().next();
// read the writer and book
writer = (Writer) lib.getWriters().get(0);
System.out.println(writer.getName());
book = (Book) lib.getBooks().get(0);
System.out.println(book.getTitle());
// show that the container is set
System.out.println(book.eContainer() == lib);
System.out.println(writer.getBooks().get(0) == book);
// Now add a new writer and book
Writer george = LibraryFactory.eINSTANCE.createWriter();
george.setName("G. Orwell");
// create a new book and set the writer and library
Book georgesBook = LibraryFactory.eINSTANCE.createBook();
georgesBook.setPages(250);
georgesBook.setTitle("1984");
georgesBook.setCategory(BookCategory.SCIENCE_FICTION_LITERAL);
georgesBook.setAuthor(george);
lib.getBooks().add(georgesBook);
lib.getWriters().add(george);
// and close of
tx.commit();
pm.close();
// reopen the pm/transaction
pm = jpoxDataStore.getPMF().getPersistenceManager();
tx = pm.currentTransaction();
tx.begin();
// retrieve all books
Query qry = pm.newQuery("SELECT FROM " + BookImpl.class.getName());
Collection coll = (Collection) qry.execute();
System.out.println(((Book) coll.iterator().next()).getTitle()); // show a title
System.out.println(((Book) coll.iterator().next()).getTitle()); // show a title
// retrieve a book which has a writer with the name of G. Orwell
qry = pm.newQuery("SELECT FROM " + BookImpl.class.getName() + " WHERE "
+ " title==\"1984\" && author == writ && writ.name == \"G. Orwell\" " + "VARIABLES "
+ WriterImpl.class.getName() + " writ");
coll = (Collection) qry.execute();
System.out.println(coll.size()); // should be 1
Book bk = (Book) coll.iterator().next();
System.out.println(bk.getTitle()); // should be 1984
System.out.println(bk.getAuthor().getName()); // should be G. Orwell
// read the library with a name ending on Library
qry = pm.newQuery("SELECT FROM " + LibraryImpl.class.getName() + " WHERE name.endsWith(\"Library\")");
coll = (Collection) qry.execute();
lib = (Library) coll.iterator().next();
qry = pm.newQuery("SELECT FROM " + JpoxHelper.INSTANCE.getInstanceClass(Book.class).getName() + " WHERE "
+ " title==\"1984\" && author == writ && writ.name == \"G. Orwell\" " + "VARIABLES "
+ WriterImpl.class.getName() + " writ");
System.err.println(((Collection) qry.execute()).size());
// retrieving all books
qry = pm.newQuery("SELECT FROM " + JpoxHelper.INSTANCE.getInstanceClass(Book.class).getName());
System.err.println(((Collection) qry.execute()).size());
// retrieving all libraries with a name ending on library
qry = pm.newQuery("SELECT FROM " + JpoxHelper.INSTANCE.getInstanceClass(Library.class).getName()
+ " WHERE name.endsWith(\"Library\")");
System.err.println(((Collection) qry.execute()).size());
// and really close of
tx.commit();
pm.close();
try {
String uriStr = "jpox://?" + JPOXResourceDAO.DS_NAME_PARAM + "=MyPMF";
final URI uri = URI.createURI(uriStr);
ResourceSet resourceSet = new ResourceSetImpl();
final Resource res = resourceSet.createResource(uri);
res.load(Collections.EMPTY_MAP);
Iterator it = res.getContents().iterator();
Library libTest;
while (it.hasNext()) {
libTest = (Library) it.next();
System.out.println(libTest.getName());
}
Library libNew = LibraryFactory.eINSTANCE.createLibrary();
libNew.setName("My Second Library");
// create a writer
Writer writerNew = LibraryFactory.eINSTANCE.createWriter();
writerNew.setName("I. Asimov");
// and one of his books
Book bookNew = LibraryFactory.eINSTANCE.createBook();
bookNew.setAuthor(writerNew);
bookNew.setPages(305);
bookNew.setTitle("Foundation and Empire");
bookNew.setCategory(BookCategory.SCIENCE_FICTION_LITERAL);
// add the writer/book to the library.
libNew.getWriters().add(writerNew);
libNew.getBooks().add(bookNew);
// Add the top-level object to the resource
res.getContents().add(libNew);
// and save them all
res.save(Collections.EMPTY_MAP);
} catch (IOException i) {
throw new RuntimeException("IOException " + i.getMessage(), i);
}
jpoxDataStore.close();
}
}
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