Saving modified existing object vs copy with modified fields

Question

I would like to ask for advice about Spring JPA and hibernate during modifying objects. Maybe it depends on design pattern or something.

There are two possibilities:

1. Copy existing object (create new reference) modify and save copy as object.
2. Modify existing object (without changing reference) and save.

Could you answer and explain why/when use which ?

Answer 1

JPA旨在以您描述为选项1的方式使用：

加载实体，修改它并（隐式地）在提交事务/会话时保存它。