Hi Thomas, indeed if I repetead the lookup(using different ids) 100 times or even 1000 times the difference is decreasing, proportionally speaking.
iterations Hibernate OJB 1 .122s .867s 100 1.50s 3.09s 1000 12.90s 25.54s I agree with you this is a basic performance test, but I was surprised seeing that for a simple load the difference is that big. Regards, florin -----Original Message----- From: Mahler Thomas [mailto:[EMAIL PROTECTED] Sent: Tuesday, November 04, 2003 4:21 PM To: 'OJB Users List' Subject: RE: Loading an object Hi Florin, IMO it makes not much sense to compare the performance of two persistence engines based on such a simplified test. You must test things like working with real world object models, with high loads over a longer period of time, multi user access scenarios, etc. I don't know about Hibernate, but OJB at least has a "warming up" phase. So for this simple test hings will look differenet if you perform it in a loop with say 10 000 iterations! cu, Thomas > -----Original Message----- > From: Florin Pop [mailto:[EMAIL PROTECTED] > Sent: Tuesday, November 04, 2003 3:09 PM > To: '[EMAIL PROTECTED]' > Subject: RE: Loading an object > > > Hi bellow are the 2 methods > > public void testLoadPersonUsingOJB() throws Exception { > long time = System.currentTimeMillis(); > final long PERSON_ID = 112327; > Person person = new Person(); > Identity id = new Identity(Person.class, > Person.class, new Long[] > {new Long(PERSON_ID)}); > person = (Person) broker.getObjectByIdentity(id); > assertTrue(person != null); > assertTrue(null != person.getBirthday()); > assertTrue(null != person.getCitizenship()); > assertTrue(null != person.getCity()); > assertTrue(null != person.getFirstName()); > assertTrue(null != person.getName()); > assertTrue(null != person.getStreet()); > time = System.currentTimeMillis() - time; > System.out.println(time); > } > > public void testLoadPersonUsingHibernate() throws Exception { > long time = System.currentTimeMillis(); > final long PERSON_ID = 112327; > Person person = (Person) session.load(Person.class, new > Long(PERSON_ID)); > assertTrue(person != null); > assertTrue(null != person.getBirthday()); > assertTrue(null != person.getCitizenship()); > assertTrue(null != person.getCity()); > assertTrue(null != person.getFirstName()); > assertTrue(null != person.getName()); > assertTrue(null != person.getStreet()); > assertTrue(null != person.getFullName()); > time = System.currentTimeMillis() - time; > System.out.println(time); > } > > the session(4 hibernate) and the broker (4 OJB) are initialized in the > constructors. > > > Regards, > > florin > > -----Original Message----- > From: Armin Waibel [mailto:[EMAIL PROTECTED] > Sent: Tuesday, November 04, 2003 3:40 PM > To: OJB Users List > Subject: Re: Loading an object > > > Hi, > > Florin Pop wrote: > > > Hi again, > > > > I have tried your suggested approach but curiously the same result. > > > > The tests that I run consist just in loading an Person > object from the > data > > source. Both with Hibernate and with OJB I use no cache and > this load > > operation is the first and only one opperation that I execute in one > > session. So there is no object cached anywhere. > > > > For me is also very surprizing the result. > > > For me too! > > How does your test looks like? > > long time = System.currentTimeMillis(); > Person person = (Person) broker.getObjectByQuery(query); > time = System.currentTimeMillis() - time; > > Can you post source of both test? > > regards, > Armin > > > > Regards, > > Florin > > > > PS: I have another question: is it possible in OJB to map > an object field > to > > a calculated value. For example I have a birthday column in > PERSON table > and > > I want to have in the Person class a field age containing > the age of the > > person( > > age = currentDate - birthday, or something like this) > > > > > > -----Original Message----- > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > > Sent: Tuesday, November 04, 2003 2:22 PM > > To: [EMAIL PROTECTED] > > Subject: RE: Loading an object > > > > > > Hello, > > > > > >>-----Original Message----- > >>From: Florin Pop [mailto:[EMAIL PROTECTED] > > > > > >> I tried: > >> > >> Criteria crit = new Criteria(); > >> crit.addEqualTo("id", new Long(PERSON_ID)); > >> Query query = new QueryByCriteria(Person.class, crit); > >> Person person = (Person) broker.getObjectByQuery(query); > >> > >>but it works very slow, 6-8 times slower than in Hibernate: > > > > > > I do not believe that. > > > > [..] > > > > > >>Is there another way for doing this in OJB? > > > > > > try: > > > > Identity id = new Identity(Person.class, Person.class, > > new Long[] {new Long(PERSON_ID)}); > > PersistenceBroker.getObjectByIdentity(id); > > > > > > Olli > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
