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<h2>
<em>Step 2: Create and store EMF Objects</em>
</h2>
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<div class="app" id="projecthome">
<ul class="minitoc">
<li>
<a href="#Initialize+runtime+layer">Initialize runtime layer</a>
</li>
<li>
<a href="#Create+a+PersistenceManager+and+Library">Create a PersistenceManager and Library</a>
</li>
<li>
<a href="#Add+a+writer+and+book+to+the+library+and+commit">Add a writer and book to the library and commit</a>
</li>
<li>
<a href="#Next+Step">Next Step</a>
</li>
</ul>
<p>For this tutorial create a <a href="Tutorial1.java">Tutorial1.java</a> class in the
org.eclipse.example.library package.
The class should have a static main method.</p>
<a name="N10015"></a><a name="Initialize+runtime+layer"></a>
<div class="h3">
<h3>Initialize runtime layer</h3>
<p>The runtime OR Mapping layer is initialized with a few statements. Add the following statements to
the main method of the new class. Please note that you have to fill in your own database connection
information:</p>
<pre class="code">
// 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();
</pre>
<p>The call to the JpoxHelper instance creates a JpoxDataStore and registers it, at that point no initialization takes place.
First the db connection info has to be passed and the to-be-persisted EPackages have to be set. The initialize method
will create/update the database schema. After this the PersistenceManagerFactory and a
PersistenceManager can be retrieved from the JpoxDataStore.</p>
<p>For your information: the PersistenceManagerFactory is a JDO 2.0 object which acts like
a kind of connection factory, a PersistenceManager roughly corresponds to a connection.</p>
</div>
<a name="N10029"></a><a name="Create+a+PersistenceManager+and+Library"></a>
<div class="h3">
<h3>Create a PersistenceManager and Library</h3>
<p>Now create a PersistenceManager and a transaction. All persistence related
actions have to be done in the context of a transaction. </p>
<pre class="code">
// Now create a persistence manager and a transaction
PersistenceManager pm = jpoxDataStore.getPersistenceManager();
Transaction tx = pm.currentTransaction();
</pre>
<p>Begin a transaction, create a library and make it persistent</p>
<pre class="code">
// start a transaction, create a library and make it persistent
tx.begin();
Library lib = LibraryFactory.eINSTANCE.createLibrary();
lib.setName("My Library");
pm.makePersistent(lib);
</pre>
</div>
<a name="N1003E"></a><a name="Add+a+writer+and+book+to+the+library+and+commit"></a>
<div class="h3">
<h3>Add a writer and book to the library and commit</h3>
<p>Next a book and writer are created and added to the library. At the commit these are also persisted because
the library refers to the book and writer.</p>
<pre class="code">
// 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
</pre>
</div>
<a name="N1004C"></a><a name="Next+Step"></a>
<div class="h3">
<h3>Next Step</h3>
<p>In the next step of this tutorial the above library is retrieved again from the relational store using a JDOQL query
and a book and writer are added to the library.</p>
<p>Please click <a href="tutorial1_3.html">here</a> to go to the next step.</p>
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