Hi,
because EJB is implemented via Hibernate in the Background you can try this:
| public abstract class GenericDAOImpl<T, ID extends Serializable> implements
| GenericDAO<T, ID> {
|
| private static final Log _log = LogFactory.getLog(GenericDAOImpl.class);
|
| @PersistenceContext(type = PersistenceContextType.EXTENDED, unitName =
"portalEM")
| protected EntityManager em;
|
| private Class persistentClass;
|
| public GenericDAOImpl(Class persistentClass) {
| this.persistentClass = persistentClass;
| }
|
| public Class getPersistentClass() {
| return persistentClass;
| }
|
| @SuppressWarnings("unchecked")
| @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)
| public T findByPrimaryKey(ID id) {
| try {
| return (T) em.find(getPersistentClass(), id);
| } catch (RuntimeException e) {
| _log.error("Exception while findByPrimaryKey", e);
| throw e;
| }
| }
|
| @SuppressWarnings("unchecked")
| @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)
| public List<T> findAll() {
| try {
| return em.createQuery("from " + getPersistentClass())
| .getResultList();
| } catch (RuntimeException e) {
| _log.error("Exception while findAll", e);
| throw e;
| }
| }
|
| @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)
| public T makePersistent(T entity) {
| try {
| return em.merge(entity);
| } catch (RuntimeException e) {
| _log.error("Exception while makeTransient", e);
| throw e;
| }
| }
|
| @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)
| public void makeTransient(T entity) {
| try {
| em.remove(entity);
| } catch (RuntimeException e) {
| _log.error("Exception while makeTransient", e);
| throw e;
| }
| }
|
| @SuppressWarnings("unchecked")
| @TransactionAttribute(TransactionAttributeType.NOT_SUPPORTED)
| public List<T> findByCriteria(
| org.hibernate.criterion.Criterion... criterion) {
|
| try {
|
| org.hibernate.Session session =
((org.jboss.ejb3.entity.HibernateSession) em)
| .getHibernateSession();
| org.hibernate.Criteria crit = session
| .createCriteria(getPersistentClass());
|
| for (org.hibernate.criterion.Criterion c : criterion) {
| crit.add(c);
| }
|
| return crit.list();
|
| } catch (RuntimeException e) {
| _log.error("Exception while findByCriteria", e);
| throw e;
| }
| }
|
| @Remove
| public void remove() {
| }
|
| }
|
Because this is not defined in EJB-Spec. don't try on other App-Server.
EJB Spec. doesn't define something like a Criteria-API
Regards
Peter
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