get a field in a object in db4o in java

Question

i have a query method. i use db40 in java

public static void checkQuery(ObjectContainer db, final String nameFish) {
    ObjectSet result = db.query(new Predicate<WaterFish>() {

        @Override
        public boolean match(WaterFish fish) {
            // TODO Auto-generated method stub
            return fish.getGeneral_information().getVietnamese_name()
                    .contains("Ông tiên");
        }
    });
    listResult(result);

}

result contains : fish{nameFish, distribution} and image. how i can get only nameFish field in fish object how i can get a only field in result ? thanks

Answer 1

db4o (at least until Jan/2012) can only load full objects. You can use some tricks like introduce a new class to hold data (fields) that you don't use very often and rely on transparent activation to load this data when required (something like the code below).

class FishData
{
   private Image picture;

   // other fields, getters / setters etc
}

class Fish
{
   private string name;
   private FishData data;

   // other fields, getters / setters etc  
}