谷歌应用引擎-删除JPQL查询和级联

entityManager.remove(object)

@OneToMany(mappedBy = "persistentUser", cascade = CascadeType.ALL)
private Collection<PersistentLogin> persistentLogins;

...

@Override
@Transactional
public final void removeUserTokens(final String username) {
    final Query query = entityManager.createQuery(
        "DELETE FROM PersistentUser p WHERE username = :username");
    query.setParameter("username", username);
    query.executeUpdate();
}