Unusual object relation mapping possible with OJB ?

[Stefan Schlösser <ss...@intermediate.de>]

Hi,

I would like to know how to describe the following relations in the 
repository.xml.

class Address{   //no reference to Person
static long type = 1;
long id;

String streetName;
}

class Link{      //links Persons and address by id and type
long sourcetype;
long sourceid;

long targettype;
long targetid;y
}

class Person{   //no reference to Address
static long type = 2;
long id;

String firstName;
}

I know how to map the individual classes but how do I describe a 
relationship between Addresses and Persons ?
The relationship is defined such that it exists if a link with the 
sourcetype=1, targettype=2 and the ids of the objects exists.

I don't want to retrieve Persons when loading addresses, hence no Person 
or Address field referencing the other class exists - but be able to do 
a query to retrieve all Persons with a specific streetName.

Is that possible with OJB ?

If not, how do I need to change the model to make it work ?

Also I do not wish to carry the type field in each object, is there a 
way to get rid of it and specifiy it in the repository descriptor 
directly (with the value) ?

Is there a solution which avoids putting references of one class into 
the other ?

Thanks for any ideas.

Stefan Schlösser





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