Transaction state

Persist

• Hibernate Persist will save within transaction. 

• Will not generate the Id immediately. And the return type of the method is void

• Data persistence will happen when it’s needed.

• Only transaction commit is enough to save both parent and child

• Object is associated with any unique session then it’s in persistent state.

• Persistent instance may turn back to transient by calling delete method.

• Any instance returned by get or load method is persistent state

• persist() method guarantees that it will not execute an INSERT statement if it is called outside of transaction boundaries.

Transient

• When an object is never persisted or associated with the session it’s in Transient state.

• Transient instance may be called persistent when its save , persist or saveOrUpdate method.

Detached

• Object is persistent and not associated with any session then it’s in detached state

• Detached instances may be made persistent by calling update (), saveOrUpdate (), lock () or replicate().

• The state of a transient or detached instance may also be made persistent as a new persistent instance by calling merge ().