entitymanager

When using JPA entityManager why do you have to merge before you remove?

For a while now I have been wondering why when using JPA, do I have to write my delete methods like this: @Transactional public void delete(Account account) { if (entityManager.contains(account)) { entityManager.remove(account); } else { entityManager.remove(entityManager.merge(account)); } }...

Injecting Entitymanager via XML and not annnotations

What I am trying to do is inject through XML almost the same way that is done through A @PersistenceContext annotation. I am in need of this because of the fact I have different entity managers I need to inject into the same DAO. The databases mirror one another and I would rather have 1 base class...

Symfony2: how to get all entities of one type which are marked with “EDIT” ACL permission?

Can someone tell me how to get all entities of one type which are marked with "EDIT" ACL permission? I would like to build a query with the Doctrine EntityManager. 来源:https://stackoverflow.com/questions/6201279/symfony2-how-to-get-all-entities-of-one-type-which-are-marked-with-edit-acl-p

Is PersistenceAnnotationBeanPostProcessor of any use at all?

According to its JavaDoc, PersistenceAnnotationBeanPostProcessor seems to be responsible for injecting the EntityManager with the annotation @PersistenceContext. It appears to imply without this bean declared in the Spring application context xml, the @PersistenceContext annotation won't work....