Hibernate 学习笔记 - Lifecycle 1

最新推荐文章于 2022-11-23 18:38:47 发布

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最新推荐文章于 2022-11-23 18:38:47 发布

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分类专栏： hibernate 文章标签： hibernate java database

本文链接：https://blog.youkuaiyun.com/mythabc1987it/article/details/23740625

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本文总结了Hibernate中的三个生命周期状态：Transient、Persistent和Detached。理解这些状态有助于深入掌握Hibernate的工作原理。Transient状态下，对象与数据库无关联；Persistent状态时，Session管理对象与数据库的同步；Detached状态下，对象虽在数据库中有记录，但修改不会同步到数据库。

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这篇文章是关于Hibernate的三个Life cycle state的总结。了解清楚会对hibernate的工作原理有很好的认识。

any instance of object only can be three states:

Transient
persistent
detached

Transient :

Hibernate not manage transient object.

In transient state, POJO is communication with the client code only, no any connection with database

Persistent

in Persistent state, a Session object created to manage the persistence of the Java object and database,

change of both side will keep up-to-date.

Detached

In Detached state, POJO still has a presentation in the database but the change of POJO will not make database updated, and vice versa.

it's created by session.close() or session.evict()

detached state can be back to persistence state by connecting to a new session. it happens when callingload(), refresh(), merge(), update(), orsave() methods on the new session with a reference to the detached object.