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Extending JavaServer Faces
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public List getEventlistForUser(String userId); public List getAllEvents(); }
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In this manner, the same data access methods can be used by the JSF user-interface portion of the application The Hibernate implementation (TrainingEventRegistryHibernate) of the TrainingEventRegistry interface is as follows:
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package comjsfcompreftrainer; // other imports omitted import orghibernateQuery; import orghibernateSession; import comjsfcompreftrainerutilHibernateUtil; public class TrainingEventRegistryHibernate implements TrainingEventRegistry { public TrainingEventRegistry() { } public Integer addTrainingEvent(TrainingEvent newTE) { Session session = HibernateUtilgetSessionFactory()getCurrentSession(); sessionbeginTransaction(); Integer id = (Integer) sessionsave(newTE); sessiongetTransaction()commit(); return (id); } public void deleteTrainingEvent(TrainingEvent deletedTe) { Session session = HibernateUtilgetSessionFactory()getCurrentSession(); sessionbeginTransaction(); sessiondelete(deletedTe); sessiongetTransaction()commit(); } public void updateTrainingEvent(TrainingEvent updatedTe) { Session session = HibernateUtilgetSessionFactory()getCurrentSession(); sessionbeginTransaction(); sessionmerge(updatedTe); sessiongetTransaction()commit(); } public List getEventlistForUser(String userid){ List userlist = null; Query q = null; Session session = HibernateUtilgetSessionFactory()getCurrentSession(); sessionbeginTransaction(); q = sessioncreateQuery( "from TrainingEvent te where teuserid = :teid"); qsetParameter("teid", userid);
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A p p l y i n g J S F : I n t r o d u c i n g t h e Vi r t u a l Tr a i n e r A p p l i c a t i o n
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return qlist(); } public List getAllEvents() { List elist = new ArrayList(); Session session = HibernateUtilgetSessionFactory()getCurrentSession(); sessionbeginTransaction(); elist = sessioncreateCriteria(TrainingEventclass)list(); return elist; }
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// An extra data access method, even though not used in the application yet public TrainingEvent getTrainingEventById(int id) { TrainingEvent te = null; Session session = HibernateUtilgetSessionFactory()getCurrentSession(); sessionbeginTransaction(); te = (TrainingEvent)sessionget(TrainingEventclass, new Long(id)); return te; } }
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Parsing through every line of code and describing exactly how Hibernate provides data access is beyond the scope this book, but with a quick read through the code you can see how to use Hibernate to access/edit mapped data You ll notice that these methods use a utility class, HibernateUtil, that streamlines the data access operations The code for this class is
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package comjsfcompreftrainerutil; import orghibernate*; import orghibernatecfg*; public class HibernateUtil { private static final SessionFactory sessionFactory; static { try { // Create the SessionFactory from hibernatecfgxml sessionFactory = new Configuration()configure()buildSessionFactory(); } catch (Throwable ex) { // Make sure you log the exception, as it might be swallowed Systemerrprintln( "Initial SessionFactory creation failed" + ex); throw new ExceptionInInitializerError(ex); } } public static SessionFactory getSessionFactory() { return sessionFactory; } }
Part II:
Extending JavaServer Faces
This class was actually provided by a very useful Hibernate tutorial and is highly recommended for those getting started with Hibernate It is located at http://www hibernateorg/hib_docs/v3/reference/en/html/
Some Final Details Before Running a Hibernate Application
In addition to the object entity beans (TrainingEvent and TrainingSession) and their respective mapping files and Data Access Object (TrainingEventRegistryHibernate), to use Hibernate you also need a configuration file that stores the database-specific connection information and configures Hibernate s runtime settings The following is an example of a Hibernate configuration file for connecting to an Oracle database:
< xml version='10' encoding='utf-8' > <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 30//EN" "http://hibernatesourceforgenet/hibernate-configuration-30dtd"> <hibernate-configuration> <session-factory> <!-- Database connection settings --> <property name="connectiondriver_class"> oraclejdbcdriverOracleDriver</property> <property name="connectionurl"> jdbc:oracle:thin:@localhost:1521:orcl</property> <property name="connectionusername">hbtrainer</property> <property name="connectionpassword">hbtrainer</property> <!-- JDBC connection pool (use the built-in) --> <property name="connectionpool_size">1</property> <!-- SQL dialect --> <property name="dialect">orghibernatedialectOracleDialect</property> <!-- Enable Hibernate's automatic session context management --> <property name="current_session_context_class">thread</property> <!-- Disable the second-level cache --> <property name="cacheprovider_class"> orghibernatecacheNoCacheProvider</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <!-- Drop and re-create the database schema on startup --> <property name="hbm2ddlauto">create</property> <mapping resource="com/jsfcompref/trainer/TrainingSessionhbmxml"/> <mapping resource="com/jsfcompref/trainer/TrainingEventhbmxml"/> </session-factory> </hibernate-configuration>
First off, in a real application deployment scenario, the database connection information would not be hard-coded into this file Instead, a JNDI datasource would be used Also, the connection pool used here is purely for prototyping Another important setting is the hbm2ddlauto setting This is a property that when specified with the create value will completely refresh the database by dropping and re-creating the objects during each run This option should only be set during initial runs or when a schema change occurs Finally, at the end of the file you can see the entries for the two mapping files reviewed earlier This concludes the review of using Hibernate for building a persistence layer; for more information on Hibernate, please refer to the http://wwwhibernateorg/ Web site
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