Three states of the hibernate--object transient,persistent,detached

Transient: The object just new

Persistent:sava or post-update status

After Detached:close or clear

Test function:

@Testpublic void Testsavewith3state () {Teacher t = new Teacher (); T.setname ("T1"); T.settitle ("Middle"); T.setbirthdate ( New Date ());  At this time t is the transient state session session = Sessionfactory.getcurrentsession (); Session.begintransaction (); Session.save (t); System.out.println (T.getid ());  This is the persistent state session.gettransaction (). commit (); System.out.println (T.getid ());  This is the detached state}

3 kinds of states of distinction:

1. Is there an ID?

2. Is the ID in the database?

3. ID in memory?

Transient: An object in memory, no ID, no cache.

Persistent: In memory, slow to exist, database has, ID

Detached: Inside, cache No, database has, ID

Three states of the hibernate--object transient,persistent,detached