Re: [ojb-users] Odmg vs persistence broker

[Thomas M. <tho...@ho...>]

Hi Christoph,

Christoph Sturm wrote:
> Hi ojb team!
> 
> I am converting a project to use ojb, and i wonder if i'd better use the
> persistence broker or odmg. Reading the faq i came to the conclusion
> that odmg is always better because it supports more features.

Here is a rule of thumb:
if you build little demo applications PB is very nice to use.
Using PB is also very useful in batch programming (mass operations)
if you want to build "real" (multi-user, multi-transaction)-apps the 
ODMG layer is much better.

> But then i
> read a posting on theserverside.com which says that the persistence
> broker performance is (much?) better than the odmg api. 

If you look a mass-operation performance using the PB is much faster.
If you want to build typical web-apps with many users but short 
transaction, ODMG is OK!

> Some neat features like querybyexample seem to be available only in the
> PB. Or is there a way to access the broker from the odmg side of ojb?
> 

You can safely mix PB and ODMG API! So it's pretty OK to load Objects 
with a ojb.broker.query.Query  and use them within an ODMG transaction.

Have a look at ojb.odmg.oql.OqlQueryImpl.execute() how this is done!

hope you'll enjoy OJB,

Thomas

> Tia
>  chris
> 
> 
> 
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