AW: [Objectbridge-jdo-dev] jdo extension

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

Hi Travis,

I don't think that its a good idea to replace the repository.xml by a .jdo
file.
The JDO spec does not provide any O/R specifics like foreign-keys or
jdbc-types.
But these information are needed by OJB!

My suggestion: 
The OJB DescriptorRepository (populated from the repository.xml) does
contain *all* OJB meta-data.
We currently use this repository for all OJB runtime metadata operations and
also for generation of DDL, Java code for persistent class and also for
generation of repository.xml files.

If we need a *.jdo file to be JDO compliant we should generate it from the
OJB DescriptorRepository!
This is rather simple, fits to the existiting OJB metadata architecture and
it will allow to write 100% spec conformant *.jdo files (as they won't need
to contain vendor specifics) 

cheers,

Thomas

> 
> 
> Just thinking of how to do table mapping in the jdo files and 
> here's my thoughts from sample app:
> 
> <jdo>
>  <package name="test.ojb.tutorial3a">
>   <class name="Product" identity-type="application">
>   <extension vendor-name="ojb" table-name="Product"/>
>   <field name="id" primary-key="true">
>     <extension vendor-name="ojb" column-name="id"/>
>    </field>
>    <field name="name">
>     <extension vendor-name="ojb" column-name="name"/>
>    </field>
>    <field name="price">
>     <extension vendor-name="ojb" column-name="price"/>
>    </field>
>    <field name="stock">
>     <extension vendor-name="ojb" column-name="stock"/>
>    </field>
>   </class>
>  </package>
> </jdo>
> 
> 
> I don't think we'll need the jdbc datatypes anymore do we?  feedback?
> 
> Travis 
> 
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