ojb

[Kowalski Pawel <pa...@elca.ch>]

hello

1. The tutorial1 from the ojb site mentions a possibility to
forward-engineer o/r mapping from existing java classes:

[excerpt from the http://db.apache.org/ojb/tutorial1.html tutorial]:

    > Generally speaking there are three approaches in building 
    > an O/R mapping:

    > Forward engineering , Java classes (or UML model) 
    > are given, SQL DDL and mapping have to be generated.
    > We have started to work on a tool that generates a 
    > database from an existing repository.xml file. Call 
    > build[.sh] forward-db to see our forward engineering tool at work.

Running this target I always get a Message that a Class doesn't exist:

    > java.lang.NoClassDefFoundError:
org/apache/ojb/broker/metadata/auto/AutoBuildDb

Has this possibility been abandoned in the current version? (I've downloaded
a current src distribution of the OJB from sourceforge).


2. Is there a possibility to generate SQL DDL from OJB ClassDescriptors? Or
is it posssible to generate torque specific xxx-schema.xml files from the
ClassDescriptors?

thaks for your help
greetz
pawel


 





-- 

Pawel Kowalski
ELCA / www.elca.ch
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Re: ojb

[Thomas Mahler <th...@web.de>]

Hi Pawel,

Kowalski Pawel wrote:
> hello
> 
> 1. The tutorial1 from the ojb site mentions a possibility to
> forward-engineer o/r mapping from existing java classes:
> 
> [excerpt from the http://db.apache.org/ojb/tutorial1.html tutorial]:
> 
>     > Generally speaking there are three approaches in building 
>     > an O/R mapping:
> 
>     > Forward engineering , Java classes (or UML model) 
>     > are given, SQL DDL and mapping have to be generated.
>     > We have started to work on a tool that generates a 
>     > database from an existing repository.xml file. Call 
>     > build[.sh] forward-db to see our forward engineering tool at work.
> 
> Running this target I always get a Message that a Class doesn't exist:
> 
>     > java.lang.NoClassDefFoundError:
> org/apache/ojb/broker/metadata/auto/AutoBuildDb
> 
> Has this possibility been abandoned in the current version? (I've downloaded
> a current src distribution of the OJB from sourceforge).

Yes, this tool has been removed. Unfornutely the rc1 doc still mentions 
it. But this is fixed in CVS HEAD.

> 
> 2. Is there a possibility to generate SQL DDL from OJB ClassDescriptors? Or
> is it posssible to generate torque specific xxx-schema.xml files from the
> ClassDescriptors?

I'd suggest to use some xslt processing for this task. I believe several 
users have done so.
I think there are also some OJB specific feature in Torque, but I don't 
know exactly if they could be helpful for this task.

Maybe a Torque expert could share some knowledge with us mere mortals ?

cheers,
Thomas

> thaks for your help
> greetz
> pawel
> 
> 
>  
> 
> 
> 
> 
>