Hibernate 面接の質問と回答
Question: How does Hibernate distinguish between transient (i.e. newly instantiated) and detached objects?Answer: " Hibernate uses the version property, if there is one." If not uses the identifier value. No identifier value means a new object. This does work only for Hibernate managed surrogate keys. Does not work for natural keys and assigned (i.e. not managed by Hibernate) surrogate keys. " Write your own strategy with Interceptor.isUnsaved(). |
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