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From Dain Sundstrom <d...@iq80.com>
Subject Re: EJB 2.1 CMR Bi-Directional with Compound Key
Date Wed, 30 May 2007 23:21:40 GMT
I also suggest you skip CMP and move directly to JPA.  Knowing CMP  
isn't going to help you lean JPA at all.

-dain


On May 30, 2007, at 1:17 PM, Jay D. McHugh wrote:

> Mark,
>
> I thought about suggesting that you use JPA, but I wasn't sure if  
> there was a reason 'bigger than you' that was requiring you to use  
> EJB2.
>
> I tried to learn how to use EJB2 entity beans and I was defeated.
>
> I am _very_ glad that OpenJPA is integrated into Geronimo now - It  
> is making my life much easier.
>
> If you have any questions once you start working with it I'd be  
> happy to answer any questions you have (if I can).
>
> (BTW: Thanks to any and every one who had a part in getting JPA  
> working in Geronimo!)
>
> Jay
>
> Mark Aufdencamp wrote:
>> Thanks for the response Gianny.  I've wacked out a small demo that  
>> I'm working on right now with a session facade, the three beans,  
>> and the database tables.  I'll let you all know how it goes:)
>>  I'm planning on hittting EJB 3.0 hard once I understand this.  I  
>> want to comprehend the legacy way first!
>>
>>
>>     -------- Original Message --------
>>     Subject: Re: EJB 2.1 CMR Bi-Directional with Compound Key
>>     From: Gianny Damour <gianny.damour@optusnet.com.au>
>>     Date: Wed, May 30, 2007 7:07 am
>>     To: user@geronimo.apache.org
>>
>>     Hi Mark,
>>
>>     I had a look to the openejb-jar DD and I think you need to  
>> drop the      <foreign-key-column-on-source/> element from the  
>> Committee-     CommitteeMembers relation. This optional element  
>> means that the      foreign key columns declared in the following  
>> <cmr-field-mapping>      elements are defined by the CMP declared  
>> by <relationship-role-source>.
>>
>>     So, this should work:
>>
>>     <ejb-relation>
>>        <ejb-relation-name>Committee-CommitteeMembers</ejb-relation- 
>> name>
>>        <ejb-relationship-role>
>>          <ejb-relationship-role-name>Committee-has-many- 
>> CommitteeMembers</     ejb-relationship-role-name>
>>          <relationship-role-source>
>>            <ejb-name>CommitteeEntity</ejb-name>
>>          </relationship-role-source>
>>          <cmr-field>
>>            <cmr-field-name>committeeMembers</cmr-field-name>
>>          </cmr-field>
>>          <role-mapping>
>>            <cmr-field-mapping>
>>              <key-column>CommitteeId</key-column>
>>              <foreign-key-column>CommitteeId</foreign-key-column>
>>            </cmr-field-mapping>
>>          </role-mapping>
>>        </ejb-relationship-role>
>>     </ejb-relation>
>>
>>     Also, you do not need to declare both sides of a relationship:  
>> the      above is enough to declare the CMR mapping for the  
>> Committee-     CommitteeMembers relation.
>>
>>     BTW, I strongly recommend you to upgrade to OpenEJB3: this  
>> should be      a seamless migration from a CMP perspective as the  
>> OpenEJB guys have      done a fantastic work at writing an  
>> OpenEJB2 schema converter.
>>
>>     Thanks,
>>     Gianny
>>
>>     On 30/05/2007, at 1:07 AM, Mark Aufdencamp wrote:
>>
>>     > I could really use some help on this!  I have a two Entity  
>> beans      > with a bi-directional relationship, committees  
>> and      > committee_members.  Committees has a single field  
>> primary key of      > committeeId.  Committee_members has a  
>> compound primary key of      > CommitteeId+UserId.  A Foreign Key  
>> constraint has been defined for      > the committee_members table  
>> based on the committeeId.  I can't seem      > to get this to  
>> deploy and believe it's my openejb-jar.xml      > deployment  
>> descriptor in the <relationship> section.  I've looked      > at  
>> examples from JBoss and Sun, so I'm fairly certain my ejb-     >  
>> jar.xml is correct.
>>     >
>>     > Does anyone have a working example of a bi-directional  
>> relatioship      > where the many table has a compound key that I  
>> can take a look at?
>>     >
>>     > Where can I find documentation on how OpenEJB and TranQL  
>> interact      > to create the O/R map?
>>     >
>>     > This knowledge are really seems to be lacking documentation  
>> in      > Geronimo.  I'd really like to draw some pretty pictures  
>> of tables      > and beans with the seven different relationship  
>> types defined for      > EJB 2.1.  This would be good preliminary  
>> work for documenting EJB      > 3.0 examples.  Please help me  
>> learn, so I can contribute:)
>>     >
>>     > TIA,
>>     > Mark Aufdencamp
>>     > Mark@Aufdencamp.com <http://email.secureserver.net/ 
>> pcompose.php? 
>> aEmlPart=0&type=reply&folder=INBOX.Apache.Geronimo.Users&uid=108#Comp

>> ose>
>>
>>


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