AW: [OJB-developers] Documentation

[Mahler T. <tho...@it...>]

Hi Joachim,

> 
> Hy,
> 
> we're currently looking for a good persistance layer for our 
> project. The
> only two real candidates left are ObJectBridge and Kodo JDO. 
> ObJectBridge
> seems to have a great design and to be powerfull enough (we 
> implemented a
> prototype using Castor, but were quite disapointed by it's 
> abbilities (no
> real polymorphism for example)). Our main problem with OJB at 
> the moment is
> the pretty steep learning curve. 

Leraning with respect to API? Mapping? 

I tried the tests with MySQL 
> and it took
> quite some work to get the tests to run (and still 2 do fail, 
> but that is
> caused by MySQLs way to handle CLOBs (it strips spaces from 
> the end)). I
> understand that MySQL is not a prime target, but I think many 
> developers
> are turned away because of this. Our product should work with 
> all kinds of
> DBs, but we use MySQL for testing (along with PostgreSQL and 
> MS SQL Server
> (maybe Oracle later on)). I intend to write a walkthrough 
> from downloading
> to the first persisted class (maybe a bit more, it's intended 
> primarily for
> internal use, but I will happily contribute it if you want), because
> although the tutorials are nice, they hide a lot of work needed in
> build.xml and I think that the understanding of OBJ would be 
> greater if a
> step-by-step walkthrough would be provided.
> 

That's a great idea. OJB relies on such user contribution. We try to provide
a framework that allows to work with virtually any Rdbms.
But we can't support all datadases ourselves. (personally I'm working with
HSQLDB, DB2 and Oracle). I just don't have any MySQL Know-how.

Did you have a look at the document "how to setup OJB with a specific RDBMS"
(http://objectbridge.sourceforge.net/rdbms-support.html). This document
explains all steps necessary to run OJB with a given DB.

> One last question: it seems that supporting other Databases is just a
> matter of modifing the DDL-scripts that set up the test database and
> implementing an PlatformXXXImpl (to avoid spurious warings), is this
> correct?

Yes. (please refer again to
http://objectbridge.sourceforge.net/rdbms-support.html.
The Platform interface is currently not very useful but it will allow to get
along with all kind of RDBMS specific behaviour.

thanks for your efforts,

Thomas

> 
> regards
> Joachim Sauer
> 
> 
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