java不可变对象和更新

Question

如果我使用一个名为Name的不可变类来存储人的姓名，并且有人想要更改他们的姓名，那么他们的姓名不应该更新吗（基本上是删除旧条目并插入新条目）？这似乎与不可变的定义（通过注释）相矛盾，因为更新实体将被忽略。如果数据库中存储的不可变类需要更新，该怎么办？即使它是一个不可变的类，也不应该映射为@Immutable吗

Answer 1

参考资料说：

When an entity is read-only:

• Hibernate does not dirty-check the entity's simple properties or single-ended associations;
• Hibernate will not update simple properties or updatable single-ended associations;
• Hibernate will not update the version of the read-only entity if only simple properties or single-ended updatable associations are changed;

它还说：

In some ways, Hibernate treats read-only entities the same as entities that are not read-only:

• Hibernate cascades operations to associations as defined in the entity mapping.
• Hibernate updates the version if the entity has a collection with changes that dirties the entity;
• A read-only entity can be deleted.

因此，我认为必须删除（）实例，然后用新名称再次保存（），因为脏检查不会发生在只读实体上

参考：Read-only entities