Support Forums: Message List - The Busy Java Developer’s Guide to db4o http://www.theserverside.com Most recent forum messages en Jive Forums Silver 5.5.30 (www.jivesoftware.com) Wed, 19 Jun 2013 08:33:07 -0400 Re: Some more info http://www.theserverside.com/discussions/thread.tss?thread_id=44856 ...]]> Sat, 07 Apr 2007 04:01:02 -0400 Sat, 07 Apr 2007 04:01:02 -0400 Sat, 07 Apr 2007 04:01:02 -0400 Apr 7, 2007 tetyana loskutova 0 Re: The Busy Java Developer’s Guide to db4o http://www.theserverside.com/discussions/thread.tss?thread_id=44856 I'm not sure if this addresses my point or not. The problem area I am referring to is data-warehousing. Most of the clients of our data-warehouse are not developers. We don't have time to modify the schema for every report they might want...]]> Fri, 06 Apr 2007 13:18:13 -0400 Fri, 06 Apr 2007 13:18:13 -0400 Fri, 06 Apr 2007 13:18:13 -0400 Apr 6, 2007 Robert Greene 0 Re: The Busy Java Developer’s Guide to db4o http://www.theserverside.com/discussions/thread.tss?thread_id=44856
If you need a database for other purposes that just persisting an application's data, you probably need a relational database. The advantage of a relational database is it allows data to be retrieved in combinations that you did...]]> Fri, 06 Apr 2007 09:37:32 -0400 Fri, 06 Apr 2007 09:37:32 -0400 Fri, 06 Apr 2007 09:37:32 -0400 Apr 6, 2007 James Watson 1 Re: The Busy Java Developer’s Guide to db4o http://www.theserverside.com/discussions/thread.tss?thread_id=44856 what major commercial and open source OODBMS systems are around?
And how do they stack up in terms of stability, robustness, resilience and scalability?...]]> Thu, 05 Apr 2007 17:31:38 -0400 Thu, 05 Apr 2007 17:31:38 -0400 Thu, 05 Apr 2007 17:31:38 -0400 Apr 5, 2007 Robert Greene 0 Re: The Busy Java Developer’s Guide to db4o http://www.theserverside.com/discussions/thread.tss?thread_id=44856 what major commercial and open source OODBMS systems are around?
And how do they stack up in terms of stability, robustness, resilience and scalability?...]]> Thu, 05 Apr 2007 17:30:43 -0400 Thu, 05 Apr 2007 17:30:43 -0400 Thu, 05 Apr 2007 17:30:43 -0400 Apr 5, 2007 Robert Greene 0 Re: The Busy Java Developer’s Guide to db4o http://www.theserverside.com/discussions/thread.tss?thread_id=44856 Is Kieron McCammon still with Versant? He was our consultant on-site in '99.
...]]> Thu, 05 Apr 2007 16:51:49 -0400 Thu, 05 Apr 2007 16:51:49 -0400 Thu, 05 Apr 2007 16:51:49 -0400 Apr 5, 2007 Robert Greene 0 Re: The Busy Java Developer’s Guide to db4o http://www.theserverside.com/discussions/thread.tss?thread_id=44856 If you need a database for other purposes that just persisting an application's data, you probably need a relational database. The advantage of a relational database is it allows data to be retrieved in combinations that you did not consider...]]> Thu, 05 Apr 2007 09:21:20 -0400 Thu, 05 Apr 2007 09:21:20 -0400 Thu, 05 Apr 2007 09:21:20 -0400 Apr 5, 2007 Chris Herron 2 Re: Lazy loading: db4o+JPOX http://www.theserverside.com/discussions/thread.tss?thread_id=44856 I could not bring myself to give up lazy loading - which at that time db4o did not support ... I'm not sure if lazy loading is natively supported now by db4o (I doubt it is)...]]> Thu, 05 Apr 2007 09:12:21 -0400 Thu, 05 Apr 2007 09:12:21 -0400 Thu, 05 Apr 2007 09:12:21 -0400 Apr 5, 2007 Chris Herron 0 Re: The Busy Java Developer’s Guide to db4o http://www.theserverside.com/discussions/thread.tss?thread_id=44856 Unique indexes don't seem to be supported either....]]> Thu, 05 Apr 2007 08:58:43 -0400 Thu, 05 Apr 2007 08:58:43 -0400 Thu, 05 Apr 2007 08:58:43 -0400 Apr 5, 2007 Chris Herron 0 Re: The Busy Java Developer’s Guide to db4o http://www.theserverside.com/discussions/thread.tss?thread_id=44856 Regarding moving to "hollow", that can be left to the impl to decide if it wants to null out fields when the txn ends (normally uses "retainValues" property), but db4o also allows you to "deactivate" objects (currently JPOX leaves the values...]]> Thu, 05 Apr 2007 03:39:39 -0400 Thu, 05 Apr 2007 03:39:39 -0400 Thu, 05 Apr 2007 03:39:39 -0400 Apr 5, 2007 Andy Jefferson 0 Re: The Busy Java Developer’s Guide to db4o http://www.theserverside.com/discussions/thread.tss?thread_id=44856 I'm surprised that it took so little time. In the version of db4o I used (early last year) it had no persistence by reachability, and no correct optimistic locking on transactions. I can't remember the exact issue but the lack of...]]> Thu, 05 Apr 2007 01:23:44 -0400 Thu, 05 Apr 2007 01:23:44 -0400 Thu, 05 Apr 2007 01:23:44 -0400 Apr 5, 2007 Andy Jefferson 1 Re: The Busy Java Developer’s Guide to db4o http://www.theserverside.com/discussions/thread.tss?thread_id=44856
The implementation as far as it is currently taken (all persistence operations, getObjectById, getExtent, metadata/annotations, persistence-by-reachability, cascade-delete etc) was straightforward, taking 1-2 weeks effort. The...]]> Wed, 04 Apr 2007 16:15:22 -0400 Wed, 04 Apr 2007 16:15:22 -0400 Wed, 04 Apr 2007 16:15:22 -0400 Apr 4, 2007 Andrew McVeigh 0 Re: The Busy Java Developer’s Guide to db4o http://www.theserverside.com/discussions/thread.tss?thread_id=44856 The implementation as far as it is currently taken (all persistence operations, getObjectById, getExtent, metadata/annotations, persistence-by-reachability, cascade-delete etc) was straightforward, taking 1-2 weeks effort. The remaining...]]> Wed, 04 Apr 2007 16:03:33 -0400 Wed, 04 Apr 2007 16:03:33 -0400 Wed, 04 Apr 2007 16:03:33 -0400 Apr 4, 2007 Andrew McVeigh 3 Re: The Busy Java Developer’s Guide to db4o http://www.theserverside.com/discussions/thread.tss?thread_id=44856 Did JPOX used to be the reference implementation in another life or am I thinking of something else.
JPOX 1.1 was the RI for JDO 2.0. JPOX 1.2 will be the RI for JDO 2.1...]]> Wed, 04 Apr 2007 15:52:44 -0400 Wed, 04 Apr 2007 15:52:44 -0400 Wed, 04 Apr 2007 15:52:44 -0400 Apr 4, 2007 Andy Jefferson 4 Re: The Busy Java Developer’s Guide to db4o http://www.theserverside.com/discussions/thread.tss?thread_id=44856
I prefer the JDO interface, certainly compared to db4o's interface

... so you could use JPOX 1.2 and have a JDO2 (or JPA1) interface and use DB4O underneath ;-)

-Andy
JPOX -...]]> Wed, 04 Apr 2007 15:41:06 -0400 Wed, 04 Apr 2007 15:41:06 -0400 Wed, 04 Apr 2007 15:41:06 -0400 Apr 4, 2007 Andrew McVeigh 5