Support Forums: Message List - JPOX 1.1.0 (JDO2 Reference Implementation) released

Support Forums: Message List - JPOX 1.1.0 (JDO2 Reference Implementation) released http://www.theserverside.com Most recent forum messages en Jive Forums Silver 5.5.30 (www.jivesoftware.com) Thu, 23 May 2013 13:18:20 -0400 Class discriminators: unique IDs or fully qualified class names? http://www.theserverside.com/discussions/thread.tss?thread_id=40266

Hibernate does not require any particular visibility of fields, nor getter or setter methods.

Cool, the remaining 'extras' weren't just Hibernate specific 'extras' but stuff that both engines benefit...]]> Tue, 09 May 2006 19:35:02 -0400 Tue, 09 May 2006 19:35:02 -0400 Tue, 09 May 2006 19:35:02 -0400 May 9, 2006 Chris Golfman 0 In proxy based ORMs you can't test for null if it's 0-1 lazy http://www.theserverside.com/discussions/thread.tss?thread_id=40266

So which case would cause the problem with null semantics as discussed and is solved by Hibernate implicitly turning off lazy loading?

The case I've described twice now, Ok so you're confirming that there...]]> Tue, 09 May 2006 18:50:41 -0400 Tue, 09 May 2006 18:50:41 -0400 Tue, 09 May 2006 18:50:41 -0400 May 9, 2006 Chris Golfman 0 In proxy based ORMs you can't test for null if it's 0-1 lazy http://www.theserverside.com/discussions/thread.tss?thread_id=40266 So which case would cause the problem with null semantics as discussed and is solved by Hibernate implicitly turning off lazy loading? I just want to avoid it or possibly get the tool to perform a design critique and suggest to the user that...]]> Tue, 09 May 2006 12:30:30 -0400 Tue, 09 May 2006 12:30:30 -0400 Tue, 09 May 2006 12:30:30 -0400 May 9, 2006 Christian Bauer 2 In proxy based ORMs you can't test for null if it's 0-1 lazy http://www.theserverside.com/discussions/thread.tss?thread_id=40266

I think what you're saying is that "lazy 0-1 associations don't work in Hibernate unless you turn on byte code enhancement".

That is incorrect and clearly not what I said. There is no other solution for...]]> Tue, 09 May 2006 11:51:09 -0400 Tue, 09 May 2006 11:51:09 -0400 Tue, 09 May 2006 11:51:09 -0400 May 9, 2006 Chris Golfman 3 In proxy based ORMs you can't test for null if it's 0-1 lazy http://www.theserverside.com/discussions/thread.tss?thread_id=40266 I think what you're saying is that "lazy 0-1 associations don't work in Hibernate unless you turn on byte code enhancement".
That is incorrect and clearly not what I said.

There is no other solution for...]]> Tue, 09 May 2006 10:32:13 -0400 Tue, 09 May 2006 10:32:13 -0400 Tue, 09 May 2006 10:32:13 -0400 May 9, 2006 Christian Bauer 4 Why not SQL? http://www.theserverside.com/discussions/thread.tss?thread_id=40266 It is possible to transform SQL or JDOQL query string to the same "native" SQL query string. There are many free SQL parser, driver adapter implementations and there are no technical problems to transform query strings, but it looks...]]> Tue, 09 May 2006 10:31:33 -0400 Tue, 09 May 2006 10:31:33 -0400 Tue, 09 May 2006 10:31:33 -0400 May 9, 2006 Steve Zara 0 In proxy based ORMs you can't test for null if it's 0-1 lazy http://www.theserverside.com/discussions/thread.tss?thread_id=40266 Of course proxies work for zero-to-one associations. What Emmanuel wanted to say is that ... [techno bable deleted]For me, a feature either works without issues and workarounds or it doesn't. The negative airplay that many...]]> Tue, 09 May 2006 09:23:41 -0400 Tue, 09 May 2006 09:23:41 -0400 Tue, 09 May 2006 09:23:41 -0400 May 9, 2006 Chris Golfman 5 Why not SQL? http://www.theserverside.com/discussions/thread.tss?thread_id=40266 Tue, 09 May 2006 08:59:28 -0400 Tue, 09 May 2006 08:59:28 -0400 Tue, 09 May 2006 08:59:28 -0400 May 9, 2006 Juozas Baliuka 1 In proxy based ORMs you can't test for null if it's 0-1 lazy http://www.theserverside.com/discussions/thread.tss?thread_id=40266 Tue, 09 May 2006 02:32:46 -0400 Tue, 09 May 2006 02:32:46 -0400 Tue, 09 May 2006 02:32:46 -0400 May 9, 2006 Christian Bauer 6 Some thoughts http://www.theserverside.com/discussions/thread.tss?thread_id=40266 1/ As for performance, the remark on Hibernate being slow is justified (cf http://www.jpox.org/docs/performance.html - would be interesting to see how JPOX final...]]> Tue, 09 May 2006 02:06:34 -0400 Tue, 09 May 2006 02:06:34 -0400 Tue, 09 May 2006 02:06:34 -0400 May 9, 2006 Christian Bauer 0 In proxy based ORMs you can't test for null if it's 0-1 lazy http://www.theserverside.com/discussions/thread.tss?thread_id=40266 So let's me rephrase the whole thing when you have a lazy 0-1 association: - on a proxy based solution a 0-1 association will be eagerly loaded when the first object is rendered (we disable the lazy loading in this...]]> Mon, 08 May 2006 23:39:01 -0400 Mon, 08 May 2006 23:39:01 -0400 Mon, 08 May 2006 23:39:01 -0400 May 8, 2006 Chris Golfman 7 You can test for null if it's not lazy. http://www.theserverside.com/discussions/thread.tss?thread_id=40266 "You can test for null if it's not lazy." was what someone on the Hibernate team, called Emmanuel (same name might just be a coincidence), said in the Hibernate forum.
I am this Emmanuel and I must admit this...]]> Mon, 08 May 2006 19:47:09 -0400 Mon, 08 May 2006 19:47:09 -0400 Mon, 08 May 2006 19:47:09 -0400 May 8, 2006 Emmanuel Bernard 8 You can test for null if it's not lazy. http://www.theserverside.com/discussions/thread.tss?thread_id=40266 Given that 99% of the time when I test for the existence of an object that can optionally hang off another object I'm about to do something with that very object (if it exists) so I need it loaded anyway - where's the...]]> Mon, 08 May 2006 19:08:37 -0400 Mon, 08 May 2006 19:08:37 -0400 Mon, 08 May 2006 19:08:37 -0400 May 8, 2006 Steve Zara 0 You can test for null if it's not lazy. http://www.theserverside.com/discussions/thread.tss?thread_id=40266 Dude, do not half cut you message. I stand on my position, you're wrong:

In a popular ORM that uses proxy based lazy loading mechanism see what happens when you create a to 0..1 relationship (ie., an optional reference: a reference...]]> Mon, 08 May 2006 18:24:24 -0400 Mon, 08 May 2006 18:24:24 -0400 Mon, 08 May 2006 18:24:24 -0400 May 8, 2006 Chris Golfman 10 JPA http://www.theserverside.com/discussions/thread.tss?thread_id=40266 If it embraces the cool features of all persistence FWs, and learns from the mistakes of EJBs (that includes v3 I'm afraid) it'll live.

If not, I'm afraid it'll continue to...]]> Mon, 08 May 2006 09:11:41 -0400 Mon, 08 May 2006 09:11:41 -0400 Mon, 08 May 2006 09:11:41 -0400 May 8, 2006 Wolf Benz 0