Re: Business Objects vs Data Objects [was Re:JXTemplates -what's in a name?]

[Derek Hohls <DH...@csir.co.za>]

Antonio

1. What books are good?
2. What is the best(?) OS implementation of JDO that 
you know of?

Thanks
Derek

>>> agallardo@agssa.net 2004/05/07 11:59:57 AM >>>
Derek Hohls dijo:
> I just found an interesting quote from a paper on JDO:
> http://www.jdocentral.com/pdf/eigner_jdo.pdf 
>
> "With the availability of JDO, it makes you wonder when
> and if you would ever need an EJB container at all within your
> application architecture if you use it only as a front-end
> to your database. All the model-oriented business logic can be
>  coded in the classes persisted by JDO, sparing us from using
> patterns such as 'data object' or 'value object'.
> After using JDO we contend that most web-based applications
> could be developed more easily with a web container and a set
> of JDO enhanced classes to encapsulate the model
> of the application. "
>
> This sounds very attractive to me from a learning POV for
> a standard DB application:
> * use flow for the controller; interactiing with forms and
> * enhanced JDO for the model/data access
> * views by generator of your choice...

Yep. This is the idea I bought last year. ;-)
BTW, there are some interesting books about JDO. And I am waiting for
JDO
2.0 that promise to be even easier than 1.0 I cannot wait for it!

Best Regards,

Antonio Gallardo


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Re: Business Objects vs Data Objects [was Re:JXTemplates-what's in a name?]

[Joerg Heinicke <jo...@gmx.de>]

On 07.05.2004 13:35, Antonio Gallardo wrote:

>>2. What is the best(?) OS implementation of JDO that you know of?
> 
> Another hard question. You can try the RI from Sun used in OJB.
> Personally, I am waiting for the Apache OJB own implementation (Brian
> McCallister - currently working on it, thank Brian!). You can find some
> hints about some OS JDO implementation here:

There are some issues with the reference implementation. I found this 
one: 
http://marc.theaimsgroup.com/?l=xml-cocoon-users&m=108367741627573&w=4, 
but not the one I remember: When querying 20 objects out of a table with 
5000 entries, for Sun' RI of JDO all 5000 objects are instantiated and 
the 20 are selected afterwards. That's an extreme performance killer and 
I switched to OJB's OTM instead of JDO. I heard much good news about the 
already mentioned TJDO: http://tjdo.sourceforge.net/.

Joerg

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Re: Business Objects vs Data Objects [was Re:JXTemplates-what's in a name?]

[Antonio Gallardo <ag...@agssa.net>]

Derek Hohls dijo:
> Antonio
>
> 1. What books are good?
Hehe.
As I told you before I am not a guru here :-D.
I just bought 1 book of JDO:

Core Java Data Objects:
http://www.amazon.com/exec/obidos/tg/detail/-/0131407317/

It was enought to me. But there are other books:

http://www.jdocentral.com/JDO_Books.html

> 2. What is the best(?) OS implementation of JDO that you know of?
Another hard question. You can try the RI from Sun used in OJB.
Personally, I am waiting for the Apache OJB own implementation (Brian
McCallister - currently working on it, thank Brian!). You can find some
hints about some OS JDO implementation here:

http://marc.theaimsgroup.com/?t=107754678600002&r=1&w=2

I hope Brian is reading this mail (Brian, r u there? Heloo? ;-)) and he
can give you much more help than me.

Best Regards,

Antonio Gallardo

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