Re: [OJB-ODMG] foreign key constraint

[Armin Waibel]

Hi Jean-Yves,
> I always have a violation of foreign key constraint, because  OJB seem's
> to try to persists instance of this class before the instance of
> Location linked with it.
>
> Is that normal ? Do I have to persists the Location object first, or is
> OJB supposed to be able to deal with that ?
Which version of OJB do you use?
When using 1:1 references OJB "normally" persists the referenced object 
before the main object, so

DocumentBaseContent dbc = new ...
Location loc = new...
dbc.setLocation(loc)
tx.begin()
database.makePersistent(dbc)
tx.commit()
should work (no need to specify the Location object, it will be detected 
by OJB).
Except when using circular- or bidirectional 1:1 references, in this 
case you have to take care of order (hope we can fix this till next 
release). A workaround is shown in the bug report in jira
http://issues.apache.org/jira/browse/OJB-18

DocumentBaseContent dbc = new ...
Location loc = new...
dbc.setLocation(loc)
tx.begin()
database.makePersistent(loc)
database.makePersistent(dbc)
tx.commit()
or
DocumentBaseContent dbc = new ...
Location loc = new...
tx.begin()
database.makePersistent(dbc)
tx.flush()
dbc.setLocation(loc)
tx.commit()
regards,
Armin
jys wrote:
Hello,
I have a problem (probably simple) trying to persist a Class looking 
like this :

.....
* @ojb.class proxy="dynamic"
*
* @ojb.field name="locationId" jdbc-type="VARCHAR" nullable="false"
*
* @author jys
*/
public class DocumentBaseContent implements IDocumentBaseContent {
.....
   /**
    * location
    *
    * @ojb.reference foreignkey="locationId" auto-update="none" 
auto-delete="none"
    */
   private Location locationsRoot = null;

.....
}
I always have a violation of foreign key constraint, because  OJB seem's 
to try to persists instance of this class before the instance of 
Location linked with it.

Is that normal ? Do I have to persists the Location object first, or is 
OJB supposed to be able to deal with that ?

Thanks for your help.
Jean-Yves
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