[英]is there a way to update an entity after any update of other entities?
I got a project in spring and I want to set a flag on a entity meaning that any other entities are modified.我在春天有一个项目,我想在一个实体上设置一个标志,这意味着任何其他实体都被修改了。 So on any update on these entities i have to do another update on my entity.
因此,在对这些实体进行任何更新时,我必须对我的实体进行另一次更新。 Do you know a correct way to do this?
你知道这样做的正确方法吗?
You can do it like this, credit to this answer你可以这样做,归功于这个答案
@Component
public class MyEventListener implements PreInsertEventListener {
private static final long serialVersionUID = 1L;
@Autowired
private EntityManagerFactory entityManagerFactory;
@Autowired
private AuditRepository auditRepository;
@PostConstruct
private void init() {
SessionFactoryImpl sessionFactory = entityManagerFactory.unwrap(SessionFactoryImpl.class);
EventListenerRegistry registry = sessionFactory.getServiceRegistry().getService(EventListenerRegistry.class);
registry.getEventListenerGroup(EventType.PRE_INSERT).appendListener(this);
}
@Override
public boolean onPreInsert(PreInsertEvent preInsertEvent) {
Object entity = preInsertEvent.getEntity();
if (Customer.class.isInstance(entity)) {
auditRepository.save(new Audit("inserted " + entity));
}
return false;
}
}
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