When merging a detached object back into a session, JPA will examine the object and update the data store with any changed values.
将分离对象合并回会话时，JPA将检查该对象，并使用任何更改值来更新数据存储区。
When merging a detached object back into a session, JPA will examine the object and update the data store with any changed values.
将分离对象合并回会话时，JPA将检查该对象，并使用任何更改值来更新数据存储区。
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