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From Ilan Kirsh <ki...@objectdb.com>
Subject Re: The Future of JDO
Date Sat, 07 Oct 2006 16:33:08 GMT
Except the number 15 (I am afraid that these days there are much less active
JDO implementations) I agree with every word. Things have changed. The
success of JPA might be now in our interest (anyway more than it is in the
interest of Hibernate...).

----- Original Message ----- 
From: "David Jordan" <davejrdn@bellsouth.net>
To: "Andy Jefferson" <andy@jpox.org>
Cc: <jdo-dev@db.apache.org>; "JDO Expert Group" <jdo-experts-ext@sun.com>
Sent: Friday, October 06, 2006 11:25 PM
Subject: Re: The Future of JDO

> I think we need several thorough, fair and objective, exhaustive lists:
> What does JDO have beyond JPA?
> What does JDO lack that is in JPA?
> Where are the semantic differences between JDO and JPA and can they  be 
> reconciled?
> This list should be used by JDO supporters to decide what should be  done.
> This list should also get published.
> On Oct 6, 2006, at 11:02 AM, Andy Jefferson wrote:
>>> I always introduce JPA as a subset of JDO, which is true in terms of
>>> concepts
>> A while back we compiled a table of the differences (between JDO2  and 
>> JPA1) to
>> assist users in choosing what they want. You can find it here :-
>> http://www.jpox.org/docs/persistence_technology.html
>> The table is not exhaustive (since we only come to features as we 
>> implement
>> them). For example JPA1 doesn't allow control of specification of
>> foreign-keys, or indexes whereas JDO2 does - will add this.
>> I use this table as a basis for defining JPA1 being a subset of  JDO2, 
>> and as a
>> basis for defining what JDO2 requires to be a true superset.
>> If anyone has items to add to that table we'd be happy to update it.
>> HTH
>> -- 
>> Andy

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