hy all;
如果我有4个表A，B和C，D其中：
我有4个本地接口用于ongly table
我有4个用于保存和更新的类实现接口......
现在我喜欢在A中保存新记录，但我必须保存在B中，因为它与A和C和D中的新记录有关系。
public class GestioneAnagraficaBean {
@EJB
private InterfaceA classA
@EJB
private InterfaceB classB
@EJB
private InterfaceC classC
@EJB
private InterfaceD classD
public void save(){
try{
classB.create(b);
classA.create(a);
classC.create(C);
classD.create(d);
}catch(Exception e){
...
}
}
}
我的问题是，如果我在创建C中例外，我必须roolback创建B和A.
如果你帮助我，或者对新课程或界面的另一个想法，我很高兴
代码ClassA：
@TransactionManagement(TransactionManagementType.BEAN)
@Stateless
public class ClassA extends AbstractFacade<A> implements InterfaceA {
@PersistenceContext
private EntityManager em;
@Resource
private EJBContext context;
/**
* @see it.bway.lavoraconnoi.facade.AbstractFacade#getEJBContext()
*
* @author Bway s.r.l. - asghaier <br>
*
* Created on 18/giu/2014
*/
@Override
public EJBContext getEJBContext() {
return this.context;
}
/**
* <br>
* <br>
*
* @author Bway s.r.l. - asghaier <br>
*
* Created on 16/mag/2014 <br>
*
* @param entityClass
*
*/
public AdresseFacade() {
super(ClassA.class);
}
@Override
public void setEntityManager(EntityManager em) {
this.em = em;
}
/**
* @see it.bway.lavoraconnoi.entities.model.AbstractFacade#getEntityManager()
*
* @author Bway s.r.l. - asghaier <br>
*
* Created on 16/mag/2014
*/
@Override
public EntityManager getEntityManager() {
this.em.getEntityManagerFactory().getCache().evictAll();
return this.em;
}
}
Code AbstractFacade：
public abstract class AbstractFacade<T> {
/**
* Classa in oggetto.
*/
private final Class<T> entityClass;
/**
* Torna {@link EntityManager} <br>
* <br>
*
* @author Bway s.r.l. - asghaier
*
* Created on 16/mag/2014
*
* @return {@link EntityManager}
*
*/
public abstract EntityManager getEntityManager();
/**
* Torna {@link EJBContext} <br>
* <br>
*
* @author Bway s.r.l. - asghaier <br>
*
* Created on 18/giu/2014 <br>
*
* @return {@link EJBContext}
*
*/
public abstract EJBContext getEJBContext();
/**
* Constructore <br>
* <br>
*
* @author Bway s.r.l. - asghaier <br>
*
* Created on 16/mag/2014
*
* @param entityClass classa in oggetto
*
*/
public AbstractFacade(Class<T> entityClass) {
this.entityClass = entityClass;
}
/**
* Salvataggio di un oggetto di {@link AbstractFacade#entityClass} <br>
* <br>
*
* @author Bway s.r.l. - asghaier<br>
*
* Created on 16/mag/2014
*
* @param entity oggetto di {@link AbstractFacade#entityClass}
* @throws LavoraConNoiException in caso di errori
*
*/
public void create(T entity) throws LavoraConNoiException {
UserTransaction utx = getEJBContext().getUserTransaction();
try {
utx.begin();
getEntityManager().persist(entity);
utx.commit();
}
catch (Throwable t) {
try {
utx.rollback();
}
catch (Throwable e) {
throw new LavoraConNoiException(e);
}
throw new LavoraConNoiException(t);
}
}
/**
* Merge di un oggetto di {@link AbstractFacade#entityClass} <br>
* <br>
*
* @author Bway s.r.l. - asghaier <br>
*
* Created on 16/mag/2014
*
* @param entity {@link AbstractFacade#entityClass}
* @throws LavoraConNoiException in caso di errori
*
*/
public T merge(T entity) throws LavoraConNoiException {
UserTransaction utx = getEJBContext().getUserTransaction();
try {
utx.begin();
T entitymerge = getEntityManager().merge(entity);
utx.commit();
return entitymerge;
}
catch (Throwable t) {
try {
utx.rollback();
}
catch (Throwable e) {
throw new LavoraConNoiException(e);
}
throw new LavoraConNoiException(t);
}
}
/**
* Rimuovere di un oggetto di {@link AbstractFacade#entityClass} <br>
* <br>
*
* @author Bway s.r.l. - asghaier
*
* Created on 16/mag/2014
*
* @param id id del oggetto da rimuovere
* @throws LavoraConNoiException in caso di errore
*
*/
public void remove(Integer id) throws LavoraConNoiException {
UserTransaction utx = null;
try {
if (id != null) {
T toRemove = find(id);
if (toRemove != null) {
utx = getEJBContext().getUserTransaction();
utx.begin();
getEntityManager().remove(toRemove);
utx.commit();
}
}
}
catch (Throwable t) {
if (utx != null) {
try {
utx.rollback();
}
catch (Throwable e) {
throw new LavoraConNoiException(e);
}
}
throw new LavoraConNoiException(t);
}
}
/**
* Ricerca di oggetto di {@link AbstractFacade#entityClass} con id passato in parametro <br>
* <br>
*
* @author Bway s.r.l. - asghaier <br>
*
* Created on 16/mag/2014 <br>
*
* @param id id del oggetto da ricercare
* @return Entitie di {@link AbstractFacade#entityClass} o null se non è trovato
* @throws LavoraConNoiException in caso d'errore
*
*/
public T find(Object id) throws LavoraConNoiException {
try {
return getEntityManager().find(entityClass, id);
}
catch (Throwable t) {
throw new LavoraConNoiException(t);
}
}
/**
* Ricerca di tutti i oggetti di {@link AbstractFacade#entityClass} <br>
* <br>
*
* @author Bway s.r.l. - asghaier <br>
*
* Created on 16/mag/2014 <br>
*
* @return Lista del risultato della ricerca
* @throws LavoraConNoiException in caso d'errore
*
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public List<T> findAll() throws LavoraConNoiException {
try {
CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
cq.select(cq.from(entityClass));
return getEntityManager().createQuery(cq).getResultList();
}
catch (Throwable t) {
throw new LavoraConNoiException(t);
}
}
/**
* Ritorna numero dei oggetti di {@link AbstractFacade#entityClass} <br>
* <br>
*
* @author Bway s.r.l. - asghaier <br>
*
* Created on 16/mag/2014 <br>
*
* @return numero dei oggetti
* @throws LavoraConNoiException in caso d'errore
*
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public int count() throws LavoraConNoiException {
try {
CriteriaQuery cq = getEntityManager().getCriteriaBuilder().createQuery();
Root<T> rt = cq.from(entityClass);
cq.select(getEntityManager().getCriteriaBuilder().count(rt));
Query q = getEntityManager().createQuery(cq);
return ((Long) q.getSingleResult()).intValue();
}
catch (Throwable t) {
throw new LavoraConNoiException(t);
}
}
}
InterfaceA代码：
@Local
public interface InterfaceA{
public void create(A entity) throws LavoraConNoiException;
public A merge(A entity) throws LavoraConNoiException;
public void remove(Integer id) throws LavoraConNoiException;
public A find(Object id) throws LavoraConNoiException;
public List<A> findAll() throws LavoraConNoiException;
public int count() throws LavoraConNoiException;
public EntityManager getEntityManager();
public void setEntityManager(EntityManager em);
}