JavaGoogleAppEngine删除JPQL查询和级联

Question

我注意到，在使用下面的JPQL查询时，PersistentUser的子级没有被删除。但是，如果执行entityManager.remove(object)，则会删除子级。这是预期的吗？为什么下面的JPQL查询不执行级联删除

@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();
}

Answer 1

这是预期的，JPQL删除操作不会级联。根据JPA 1.0规范：

4.10 Bulk Update and Delete Operations

(...)

A delete operation only applies to entities of the specified class and its subclasses. It does not cascade to related entities.