Database Access - Java - page 731

<property <property name= "hibernate.connection.url"

value= "jdbc:hsqldb:mem:jpademo.db" //>
<property <property name= "hibernate.connection.username" value= "sa" //>

<property

<property name= "hibernate.connection.password" value= "" //>
<property <property name= "hibernate.transaction.factory.class"

value= "org.hibernate.transaction.JTATransactionFactory" //>
<property

<property name= "hibernate.dialect"
value= "org.hibernate.dialect.HSQLDialect" //>

<!-- Properties for other providers -->

</properties>
</persistence-unit>

</properties>

</persistence-unit>

Once all these pieces are in place, the program in Example 18-1 can be run. The data objects
are saved to disk and displayed by the program.

Example 18-2 shows the exact same example, using the exact same annotated entity classes,
using the Hibernate API.

Example 18-2. HibernateSimple
public public class HibernateSimple {

@SuppressWarnings ( "unchecked" )
public

class HibernateSimple

public static static void void main ( String [] args ) {

System . out . println ( "HibernateSimple.main()" );

Configuration cf = new new AnnotationConfiguration ();

cf . configure ();
SessionFactory sf = null null ;

Session session = null

null ;

try try {

sf = cf . buildSessionFactory ();
session = sf . openSession ();

Transaction tx = session . beginTransaction ();

// Create an entity in the database.
Person np = new new Person ( "Tom" , "Boots" );

System . out . println ( np );
session . save ( np );
tx . commit ();

int int id = np . getId ();

System . out . println ( "Created Person with Id " + id );