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From Craig L Russell <Craig.Russ...@Sun.COM>
Subject Re: Todo/issues. to handle before release..
Date Wed, 21 Dec 2005 00:10:49 GMT
Hi Thom,

On Dec 20, 2005, at 4:04 PM, Thomas Dudziak wrote:

> On 12/21/05, Craig L Russell <Craig.Russell@sun.com> wrote:
>> Java Persistence and JDO have a huge synergy with DdlUtils. If you  
>> use
>> DdlUtils as the repository of database schema, you can read the  
>> schema from
>> a database and generate JDO or JP metadata and persistent classes  
>> from the
>> DDU.
>> In the reverse direction, you can generate DDU from the JDO or JP  
>> classes
>> and then create the schema from the DDU. The JDO project earlier  
>> looked at
>> how to integrate DDU into the existing persistence model and  
>> concluded that
>> it's some work but definitely no showstoppers.
> Sounds good ! Does a XSLT suffice for JDO2 database metadata, or
> should DdlUtils (after 1.0) perhaps be able to read/write JDO2
> database metadata ?

Today there is no JDO2 database metadata, only Java and persistence  
metadata. So there is no compatibility issue, we're talking about a  
greenfield project.

Once we are into the part of the project when we can look at this,  
there are a number of components that need to be implemented. We  
would probably want to build an interface and a memory model to read  
and write DDU; and then other components that will use the memory  
model to map to persistence and vice versa.


> Tom

Craig Russell
Architect, Sun Java Enterprise System http://java.sun.com/products/jdo
408 276-5638 mailto:Craig.Russell@sun.com
P.S. A good JDO? O, Gasp!

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