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protected void updateEntity(Object entity) { getHibernateTemplate().update(entity); } protected void deleteEntity(Object entity) { getHibernateTemplate().delete(entity); } protected void deleteEntityById(Class clazz, Serializable id) { Object entity = getEntityById(clazz, id); if (entity != null) { deleteEntity(entity); } } protected List findAll(Class clazz) { return getHibernateTemplate().loadAll(clazz); } protected List findAll(Class clazz, String orderBy) { return getHibernateTemplate().findByCriteria( DetachedCriteria.forClass(clazz).addOrder(Order.asc(orderBy))); } protected List findFiltered(Class clazz, String property, Object filter) { return getHibernateTemplate().findByCriteria( DetachedCriteria.forClass(clazz).add( Expression.eq(property, filter))); } protected List findFiltered(Class clazz, String property, Object filter, String orderBy) { return getHibernateTemplate().findByCriteria( DetachedCriteria.forClass(clazz).add( Expression.eq(property, filter)).addOrder( Order.asc(orderBy))); } protected Object findUniqueFiltered(Class clazz, String property, Object filter) { return DataAccessUtils.requiredUniqueResult(getHibernateTemplate() .findByCriteria( DetachedCriteria.forClass(clazz).add( Expression.eq(property, filter)))); } protected Object findUniqueFiltered(Class clazz, String property, Object filter, String orderBy) {
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return DataAccessUtils.requiredUniqueResult(getHibernateTemplate() .findByCriteria( DetachedCriteria.forClass(clazz).add( Expression.eq(property, filter)).addOrder( Order.asc(orderBy)))); } } Finally, implementing a concrete DAO becomes almost trivial. For example, in Listing 6-16 we have the DAO interface related to the Conference domain object. Listing 6-16. The ConferenceDAO Interface public interface ConferenceDAO { Conference getConference(int conferenceId); Conference getConferenceByName(String name); List<Conference> getActiveConferences(Date beginDate, Date endDate); List<Conference> getActiveConferences(Date date); List<Conference> getAllConferences(); List<Room> getRooms(int venueId); void void void void } Using the BaseAbstractDAO, our concrete DAO implementation becomes fairly simple to understand and maintain, as shown in Listing 6-17. Listing 6-17. The ConferenceDAO Spring-Hibernate Implementation package com.integrallis.techconf.spring.dao; ... public class ConferenceDAOImpl extends BaseAbstractDAO implements ConferenceDAO { public ConferenceDAOImpl() {} public Conference getConference(int conferenceId) { return (Conference) getEntityById(Conference.class, conferenceId); } public Conference getConferenceByName(String name) { return (Conference) findUniqueFiltered(Conference.class, Conference.PROP_NAME, name); } save(Conference conference); update(Conference conference); delete(Conference conference); delete(int conferenceId);
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@SuppressWarnings("unchecked") public List<Conference> getActiveConferences(Date beginDate, Date endDate) { return getHibernateTemplate().findByCriteria( DetachedCriteria.forClass(Conference.class).add( Restrictions.between(Conference.PROP_START_DATE, beginDate, endDate)).add( Restrictions.between(Conference.PROP_END_DATE, beginDate, endDate))); } @SuppressWarnings("unchecked") public List<Conference> getActiveConferences(Date date) { return getHibernateTemplate().findByCriteria( DetachedCriteria.forClass(Conference.class) .add( Restrictions.le(Conference.PROP_START_DATE, date)) .add( Restrictions.ge(Conference.PROP_END_DATE, date))); } public void save(Conference conference) { saveEntity(conference); } public void update(Conference conference) { updateEntity(conference); } public void delete(Conference conference) { deleteEntity(conference); } public void delete(int conferenceId) { deleteEntityById(Conference.class, conferenceId); } @SuppressWarnings("unchecked") public List<Conference> getAllConferences() { return findAll(Conference.class); } @SuppressWarnings("unchecked") public List<Room> getRooms(int venueId) { return findFiltered(Room.class, "Venue.Id", venueId); } }
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Finally, in the Spring application context we need to declare the DAO bean and inject the hibernateTemplate previously defined as shown in Listing 6-18. Listing 6-18. Wiring the conferenceDAO Bean <bean id="conferenceDAO" class="com.integrallis.techconf.spring.dao.ConferenceDAOImpl"> <property name="hibernateTemplate"> <ref bean="hibernateTemplate"/> </property> </bean>
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Tip For those applications making use of Hibernate in the view of a Web application via Spring-Hibernate
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DAOs, Spring provides a solution to the possible problem of accessing a persistent object that has only been partially loaded the dreaded lazy loading and closed session exceptions that can baffle developers new to Hibernate and Spring. This is not a concern for the TechConf application since we are using completely detached DTOs between the Web and service tiers. For those choosing to expose domain objects with lazy loading of associations in the view, Spring provides an implementation of the Open Session In View strategy proposed by the Hibernate Team which basically enables a session to be opened to retrieved associated objects lazily. This strategy is based on servlet filters and AOP interception. Spring provides a servlet filter in the class OpenSessionInViewFilter, which is of course configured in the Web deployment descriptor and the OpenSessionInViewInterceptor, which can be configured from within a Spring application context. Both serve the same function, as they open a Hibernate Session during the request, binding the Session to the current thread.
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With the DAO layer completed, now we can move to wire the rest of the collaborators required by the TechConf services. Hibernate provides a powerful ORM framework, and Spring adds value by reducing and simplifying the amount of plumbing code required to use Hibernate.
Implementing DTO Pattern with DynaDTO
Implementing the DTO pattern using DynaDTO is fairly easy since DynaDTO provides a convenient class for Spring integration in the LocalBuilderFactoryBean. The LocalBuilderFactoryBean is configured in a similar fashion to the Hibernate LocalSessionFactoryBean class seen in the previous section. Listing 6-19 shows the Spring configuration for DynaDTO assuming that the DTO mappings (.dto.xml files) are located in the WEB-INF/dynadto directory of the Web application WAR.
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