JDO

[punna Kumar]

Hi,
I have three more questions!!!
1)Sun gives a JDO API.
There are also several other (product)implementations of private vendors.
Is it better to opt for SUN's JDO API or go for other vendor specific implementation of JDO(If yes, which vendor?).

2)What advantage does those vendor specific implementations have to score over Hibernate?

3)Does Sun's JDO API gives all the necessary features which Hibernate offers?

[Lasse Koskela]

Originally posted by punna Kumar:
1)Sun gives a JDO API.
There are also several other (product)implementations of private vendors.
Is it better to opt for SUN's JDO API or go for other vendor specific implementation of JDO(If yes, which vendor?).

If you want to use the JDO API, you don't really have other options than to use a vendor implementation. The reference implementation of JDO provided by Sun is not of production quality.

Originally posted by punna Kumar:
3)Does Sun's JDO API gives all the necessary features which Hibernate offers?

Well, I guess that depends on what you consider being necessary features. The JDO 1.0 specification is far less feature-rich compared to Hibernate. In that sense, the answer to your question might very well be "no".

[Pj Murray]

Hello,

You might find it useful to read this blog entery "Data Persistence Technology Comparison"


http://www.codefutures.com/weblog/corporate/archives/2005/02/data_persistenc.html

You'll find comments on the relative merits of all of the main data persistence technologies - including JDO and Hibernate.


PJ Murray
CodeFutures Software

[Thomas Whitmore]

Hi Punna,

JDO is good. You want to check out the new JDO 2 releases, as these add features like Fetch control and advanced Querying which were previously non-standard.

Sun's JDO-RI is not a real usable JDO implementation, it does not support RDBMS or multi-user requirements. It's more an example and resource for JDO vendors to work from.

JDO 2 is fully comparable with Hibernate, and may have some advantages -- better handling of == operator, standardization, clean separation of model from storage, etc.

Hope this helps.

Cheers,
Thomas
www.powermapjdo.com

[kundan varma]

HI Punna
THere are many good vendors for JDO. And no doubt JDO2 gives you a very rich feature to work with your problems. If you are looking for open source vendors then JPOX is one of the very good vendor and they have a very good supportive forum also, forum.jpox.org.
THe site is www.jpox.org .
Since you have more vendors so more competition and a better product as you know competition is always healthy(atleast in 90% cases). I have personally implemented one site in JDO using JPOX and believe me i didnt had much problem as far as technical features are concerned.
Thanks
kundan