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Posted to ojb-user@db.apache.org by "Bates, Alex" <AB...@teradata-ncr.com> on 2003/05/28 21:54:50 UTC
OJB + commercial JDO ?
Has anyone used OJB with a commercial JDO implementation? (esp. Solar
Metric?) If so, could you give an idea of the work required to integrate
the two?
thanks,
Alex
Re: OJB + commercial JDO ?
Posted by Thomas Mahler <th...@web.de>.
Hi again Alex,
Alex Bates wrote:
> Thomas,
>
> Thanks for the reply. My question actually stemmed from some others working
> on the project, who wanted to make sure our solution could integrate if a
> given client had already purchased a commercial JDO implementation.
I see, so its more a question like "can we replace a commercial JDO
implementation with OJB/JDO without problems?", right?
>
> If we had to do this, I wanted to shield applications sitting on top of OJB
> from the underlying implementation.
That's one of the reasons why we provide standard APIs like JDO and ODMG.
I know of several projects that wrote code against the ODMG API and were
thus able to swap in the ODMG implementation of choice. Either a
commercial one or OJB.
Of course there are alway minor differences between the implementations
(e.g. handling of primary and foreign keys, handling of mapping data).
But in general it should work without major headaches.
In my company we developed a very simple API for object level
transactions + a abstract syntax tree query language (stolen from the
OJB query language ;-)).
The API consists of a handful of simple interfaces and for each
persistence layer we just have to write a few wrapper classes to
implement those interfaces.
Using such a thin interface layer we are able to provide our customer
with their persistence layer of choice, be it TopLink, OJB or JDO
implementations.
> Personally, I like OJB's APIs and mapping files better than those put out by
> the JDO spec. ESPECIALLY your query APIs, I don't want to write any *QL.
> Well, I'm happy to write SQL, but not OQL, JDOQL, or EJBQL.
>
> However, the real need was to be able to integrate with a distributed cache
> like Tangosol. So I was happy to see Jason McKerr's recent email/blog about
> integrating OJB + Tangosol!
One of OJB's strengths is the plugin concept. Most of the crucial
components (e.g. cache, sql generator, connection pool, etc.) can be
replaced by your own implementations.
We are always willing to integrate plugins that could be useful for many
users into the code base. We already have a JCS cache plugin. We are
also willing to integrate a Tangosol plugin if some contributes the code!
cheers,
Thomas
> Alex
>
>
> -----Original Message-----
> From: thma32@web.de [mailto:thma32@web.de]
> Sent: Sunday, June 01, 2003 11:10 AM
> To: OJB Users List
> Subject: Re: OJB + commercial JDO ?
>
>
> Hi Alex,
>
> I have no idea what kind of integration you are looking for.
> If you are using a commercial JDO O/R tool why should you use OJB?
>
> Or are you looking for that kind of integration that we did with the OJB
> JDORI plugin for SUN's JDO RI?
> If so it depends on the layering of the commercial tool. Maybe it's as
> easy as for the OJB JDORI plugin.
> But if there is no clear layering than it will be a lot of work.
>
> cheers,
> Thomas
>
>
> Bates, Alex wrote:
>
>>Has anyone used OJB with a commercial JDO implementation? (esp. Solar
>>Metric?) If so, could you give an idea of the work required to integrate
>>the two?
>>
>>thanks,
>>
>>Alex
>>
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>
>
>
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RE: OJB + commercial JDO ?
Posted by Alex Bates <ab...@san.rr.com>.
Thomas,
Thanks for the reply. My question actually stemmed from some others working
on the project, who wanted to make sure our solution could integrate if a
given client had already purchased a commercial JDO implementation.
If we had to do this, I wanted to shield applications sitting on top of OJB
from the underlying implementation.
Personally, I like OJB's APIs and mapping files better than those put out by
the JDO spec. ESPECIALLY your query APIs, I don't want to write any *QL.
Well, I'm happy to write SQL, but not OQL, JDOQL, or EJBQL.
However, the real need was to be able to integrate with a distributed cache
like Tangosol. So I was happy to see Jason McKerr's recent email/blog about
integrating OJB + Tangosol!
Alex
-----Original Message-----
From: thma32@web.de [mailto:thma32@web.de]
Sent: Sunday, June 01, 2003 11:10 AM
To: OJB Users List
Subject: Re: OJB + commercial JDO ?
Hi Alex,
I have no idea what kind of integration you are looking for.
If you are using a commercial JDO O/R tool why should you use OJB?
Or are you looking for that kind of integration that we did with the OJB
JDORI plugin for SUN's JDO RI?
If so it depends on the layering of the commercial tool. Maybe it's as
easy as for the OJB JDORI plugin.
But if there is no clear layering than it will be a lot of work.
cheers,
Thomas
Bates, Alex wrote:
> Has anyone used OJB with a commercial JDO implementation? (esp. Solar
> Metric?) If so, could you give an idea of the work required to integrate
> the two?
>
> thanks,
>
> Alex
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ojb-user-unsubscribe@db.apache.org
> For additional commands, e-mail: ojb-user-help@db.apache.org
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: ojb-user-unsubscribe@db.apache.org
For additional commands, e-mail: ojb-user-help@db.apache.org
Re: OJB + commercial JDO ?
Posted by Thomas Mahler <th...@web.de>.
Hi Alex,
I have no idea what kind of integration you are looking for.
If you are using a commercial JDO O/R tool why should you use OJB?
Or are you looking for that kind of integration that we did with the OJB
JDORI plugin for SUN's JDO RI?
If so it depends on the layering of the commercial tool. Maybe it's as
easy as for the OJB JDORI plugin.
But if there is no clear layering than it will be a lot of work.
cheers,
Thomas
Bates, Alex wrote:
> Has anyone used OJB with a commercial JDO implementation? (esp. Solar
> Metric?) If so, could you give an idea of the work required to integrate
> the two?
>
> thanks,
>
> Alex
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ojb-user-unsubscribe@db.apache.org
> For additional commands, e-mail: ojb-user-help@db.apache.org
>
>