Google App Engine - 删除 JPQL 查询和级联
我注意到，使用下面的 JPQL 查询时，PersistentUser 的子项不会被删除。但是，如果我执行 entityManager.remove(object)，子项将被删除。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();
}
I noticed that the children of PersistentUser are not deleted when using the JPQL query below. However, the children are deleted if I perform an entityManager.remove(object). Is this expected? Why doesn't the JPQL query below also perform a cascaded delete?
@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();
}
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这是预料之中的，JPQL 删除操作不会级联。来自 JPA 1.0 规范：
This is expected, the JPQL delete operation does not cascade. From the JPA 1.0 specification: