Re: Query prefetching non-decomposed M:N relationships is unimplemented?

[Jakob Braeuchi]

hi andy,

please try adding the following method to CollectionDescriptor

public FieldDescriptor[] getForeignKeyFieldDescriptors(ClassDescriptor aCld)
{
        if (isMtoNRelation())
        {
            // BRJ: answer pkFields of referenced Class
            return aCld.getPkFields();
        }
        else
        {
            return super.getForeignKeyFieldDescriptors(aCld);
        }
}
jakob

Andy Malakov wrote:

As far as I can see from CVS, CollectionPrefetcher.buildPrefetchQuery(...)  only checks among 1:N references:

    protected Query buildPrefetchQuery(Collection ids)
    {
        CollectionDescriptor cds = getCollectionDescriptor();
        QueryByCriteria query = buildPrefetchQuery(ids, 
cds.getForeignKeyFieldDescriptors(getItemClassDescriptor()));
        ...
where cds.getForeignKeyFieldDescriptors(getItemClassDescriptor()) will return 
empty array because class CollectionDescriptor does
not override method getForeignKeyFieldDescriptors() implemented in base class 
ObjectReferenceDescriptor (which only knows about
'decomposed' FKs).
All the Best,
Andy
----- Original Message ----- 
From: "Andy Malakov" <[EMAIL PROTECTED]>
To: "OJB Users List" <[EMAIL PROTECTED]>
Sent: Tuesday, December 02, 2003 12:06 PM
Subject: Query prefetching non-decomposed M:N relationships is unimplemented?

Hello All,

Can you please confirm that association prefetching mechanism in OJB queries currently (CVS) does not support M:N associations?

Thank you,
Andy


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