Use Hibernate4 native API

Use Hibernate4 native API

In Spring 3.1, a new package named ~.hibernate4 is included( in spring-orm maven dependency). With this new APIs, using Hibernate 4 in Spring projects becomes more easy than before, you are not required to extend the HiberanteDaoSupport class or use HibernateTemplate in your implemnetation class.

1. Register a DataSource bean

2. Declare Spring specific LocalSessionFactoryBean bean.

      
       
    
       
    
       
       
    
       
    
        
         
         
           com.hantsylabs.example.spring.model 
          
         
       
       
    
       
    
        
        
          hibernate.dialect=org.hibernate.dialect.HSQLDialect hibernate.format_sql=true hibernate.show_sql=true hibernate.hbm2ddl.auto=create 
         
       
   
   
      
   
      

   The legacy Spring Hibernate3 integration provides two version of SessionFactoryBean, ~.hibernate3.LocalSessionFactoryBean targets the legacy Hibernate XML mapping configuration, ~.hibernate3.annotation.AnnotationSessionFactoryBean is use for annotation based configuration.

3. Register a transaction manager.

4. Now you can inject SessionFactory in your implementation class freely.

   @Repository
   public class Hibernate4ConferenceDaoImpl implements ConferenceDao {
   private static final Logger log = LoggerFactory
           .getLogger(Hibernate4ConferenceDaoImpl.class);
   
   @Autowired
   SessionFactory sessionFactory;
   
   private Session session() {
       return sessionFactory.getCurrentSession();
   }
   
   @Override
   public Conference findById(Long id) {
       return (Conference) session().load(Conference.class, id);
   
   }
   
   // other methods...
   }

It is very simple and stupid. All the codes are based on Hiberante Session APIs now.

NOTE: Hiberante 3 also can be configured like these, I do not demonstrate the steps here.

For the newest project, you can also use the Spring fluent java configuration API for all Spring configurations instead of the XML configuration.

The following is an example of the Java configuration, it is equivalent to the XML format above.

@Configuration
@ComponentScan(basePackages={"com.hantsylabs.example.spring.dao","com.hantsylabs.example.spring.hibernate4"})
public class HibernateConfig {

    @Bean
    public DataSource dataSource() {
        return new EmbeddedDatabaseBuilder().build();
    }

    @Bean
    public SessionFactory sessionFactory() {
        LocalSessionFactoryBuilder builder = new LocalSessionFactoryBuilder(
                dataSource());
        builder.scanPackages("com.hantsylabs.example.spring.model")
                .addProperties(hibernateProperties());

        return builder.buildSessionFactory();
    }

    private Properties hibernateProperties() {
        Properties extraProperties = new Properties();
        extraProperties.put("hibernate.format_sql", "true");
        extraProperties.put("hibernate.show_sql", "true");
        extraProperties.put("hibernate.hbm2ddl.auto", "create");
        return extraProperties;
    }

    @Bean
    public PlatformTransactionManager transactionManager() {
        return new HibernateTransactionManager(sessionFactory());
    }

}