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<h2>
<em>Step 4: Example Queries</em>
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<ul class="minitoc">
<li>
<a href="#Query+all+books">Query all books</a>
</li>
<li>
<a href="#Parameterized+query">Parameterized query</a>
</li>
<li>
<a href="#Count+query">Count query</a>
</li>
<li>
<a href="#Next+Step">Next Step</a>
</li>
</ul>
<p>In this part we show Hibernate HSQL queries to retrieve information from the database back-end.</p>
<p>(HQL is Hibernate's query language. It uses concepts similar to SQL.)</p>
<a name="N10014"></a><a name="Query+all+books"></a>
<div class="h3">
<h3>Query all books</h3>
<pre class="code">
final Session session = sessionFactory.openSession();
session.beginTransaction();
// Retrieve all Books and display their titles.
Query query = session.createQuery("FROM Book");
List books = query.list();
for (Iterator it = books.iterator(); it.hasNext();) {
Book book = (Book) it.next();
System.out.println(book.getTitle());
}</pre>
</div>
<a name="N1001F"></a><a name="Parameterized+query"></a>
<div class="h3">
<h3>Parameterized query</h3>
<pre class="code">
// Retrieve George Orwell's book.
query = session.createQuery("SELECT book FROM Book book, Writer writ WHERE "
+ " book.title='1984' AND book.author=writ AND writ.name='G. Orwell'");
books = query.list();
// Show some results
System.out.println("There are " + books.size() + " in the Library."); // should be 1
System.out.println(books.get(0).getClass().getName());
Book book = (Book) books.get(0);
System.out.println(book.getTitle()); // should be 1984
System.out.println(book.getAuthor().getName()); // should be G. Orwell</pre>
</div>
<a name="N1002A"></a><a name="Count+query"></a>
<div class="h3">
<h3>Count query</h3>
<pre class="code">
// Count the number of books in the library
query = session.createQuery("SELECT count(allbooks) FROM Library lib LEFT JOIN lib.books AS allbooks "
+ " WHERE lib.name='My Library'");
int count = ((Number) query.uniqueResult()).intValue();
// there should be 2 books
System.out.println("There are " + count + " books in the library");</pre>
</div>
<a name="N10035"></a><a name="Next+Step"></a>
<div class="h3">
<h3>Next Step</h3>
<p>The final step of this tutorial discusses the use of the EMF Resource concept.</p>
<p>
<a href="tutorial1_5.html">Click here</a> to go to the next step.</p>
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