Question

I have a table with the following columns:

id, target (string), audience_group_id, rating (Integer), job_id

target column is a string representation of one of the following values:
predicted, actual, updated

I thought to add method in Job class:

Map<AudienceGroup, Integer( this it the rating)> getAudienceRatingPerPredictedPrograms().

I am stuck with the annotation. How can I tell it to return map that the value in target is “predicted”?

Answer 1

I am stuck with the annotation. How can I tell it to return map that the value in target is “predicted”?

If this is doable (I have some doubts about the table design, this will require some testing), I think you’ll have to use the Map annotations (@org.hibernate.annotations.MapKey/MapKeyManyToMany) in conjunction with Hibernate’s filtering capabilities to filter the association.

I would first try to map the Map as wanted (probably using MapKeyManyToMany in your case). Once done with the Map, apply the filter.

I’ve never tested this.

References

• Hibernate Annotations 3.4 Reference Guide
  • 2.2.5.3. Collections
  • 2.4.6.2.2. Map
  • 2.4.9. Filters