Transitions between the three tenses of hibernate

Criteria for judging status

OID and Session Correlation

public class Hibernateutils {private static sessionfactory sessionfactory=null;static{//get config  Load Config file configuration configure = new configuration (). Configure (); sessionfactory = Configure.buildsessionfactory ();} Get sessionpublic static Session getsession () {Session session = Sessionfactory.opensession (); return session;}}

Instantaneous state

Transient state------Persistent State

Save and Saveorupdata operations

@Test//transient state converted to persistent public void test02 () {//Get connection Session session = Hibernateutils.getsession ();//open transaction Transaction TS = Session.begintransaction ();//In Free State  no OID has  nothing to do with session user User=new user ("zhangsan111", "123456789", " Zhangfei "," [email protected] "," 15029021367 ", New Date ()," M ", 1," 0 "), Session.save (user),//in persistent state  related  to session There is an OID   (transient state into a persistent state) ts.commit (); Session.close ();}

Transient state------Free State requires only one OID (the primary key generation policy is qualified so that we can only convert by persistent state)

@Test//transient state converted to Free State public void test02 () {//Get connection Session session = Hibernateutils.getsession ();//open transaction Transaction TS = Session.begintransaction ();//In Free State  no OID has  nothing to do with session user User=new user ("zhangsan111", "123456789", " Zhangfei "," [email protected] "," 15029021367 ", New Date ()," M ", 1," 0 "), Session.save (user),//in persistent state  related  to session There are OID   (transient state into persistent state) ts.commit (); Session.close (); System.out.println (User.getuid ());//In a Free State  with OID  session closed}

Persistent state

Persistent state----Transient delete operation

　　

@Test//persistent state converted to instantaneous public void test03 () {//Get connection Session session = Hibernateutils.getsession ();//open transaction Transaction TS = Session.begintransaction (); User U=session.get (User.class, "402898a45fcec558015fcec55d5c0000");//In persistent state associated with the  session  has OID   ( Transient state into persistent state) System.out.println (U); session.delete (U); Ts.commit (); Session.close ();}

Persistent----Free State close (session closed) clear clears primary cache (session) evict purge and cache (specified cache)

@Test//persistent state converted to Free State public void test03 () {//Get connection Session session = Hibernateutils.getsession ();//open transaction Transaction TS = Session.begintransaction (); User U=session.get (User.class, "987E21997C134DC4B6538010D101BCEF");//In persistent state associated with the  session  has OID   ( Transient state into a persistent state) ts.commit (); Session.close (); SYSTEM.OUT.PRINTLN (U);//At this time the Free State  has OID  session closed}

Free State

Free State----Persistent state

@Test//Free State converted to persistent public void test04 () {//Get connection Session session = Hibernateutils.getsession ();//open transaction Transaction TS = Session.begintransaction (); User U=session.get (User.class, "12");//In the persistent state associated with the  session  has an OID   (transient state into a persistent state) ts.commit (); Session.close (); U.setusername ("123456");//Free State session Session1 = Hibernateutils.getsession ();//Open transaction Transaction TS1 = Session1.begintransaction (); session1.update (U);//Persistent state ts1.commit (); Session1.close ();}

Instantaneous state of Free State----

@Test//Free State converted to instantaneous public void test04 () {//Get connection Session session = Hibernateutils.getsession ();//open transaction Transaction TS = Session.begintransaction (); User U=session.get (User.class, "12");//In the persistent state associated with the  session  has an OID   (transient state into a persistent state) ts.commit (); Session.close (); U.setusername ("123456");//Free State session Session1 = Hibernateutils.getsession ();//Open transaction Transaction TS1 = Session1.begintransaction (); Session1.delete (U);//Transient state ts1.commit (); Session1.close ();}

　　

Transitions between the three tenses of hibernate