collection « ID « JPA Q&A

1. Hibernate - Return collection of entities by ID knowing only the class    stackoverflow.com

How do I load a collection of entities of a given class, with only a single trip to the database, e.g.:

 public Collection<Object> getEntities(Class<?> entityClass,Collection<Serializable> listOfIDs);

2. Get IDs out of Uninitialized Persistent Collection    stackoverflow.com

I have a situation that I have not found an answer to when looking through the Hibernate API documentation or on SO. We have a disconnected setup, and we send entities and ...

3. add ids to collection    forum.hibernate.org

Suppose there are two classes, A and B, 1-N related. I've loaded A object and want to add some B objects to collections. Data for these objects is in database, i know ids of these objects. is there any way to add them to the collection without loading all of them from DB?

4. retrieving a collection from database by ID of FK    forum.hibernate.org

I've been trying different ways to do this, but just can't seem to figure it out. I have two different objects, represented in this way ... Parent - FoodGrpLst Child - FoodSubGrpLst The mapping files for these classes is as follows.. for FoodGrpLst... for ...

5. Populate a collection by only setting element IDs    forum.hibernate.org

My object A has a Set of object B. All my Bs are created first, and as I create each object A, I populate the set with the appropriate Bs (there's usually only one). I already know the ID of the B object I want to add to the set, so is there anyway to avoid loading the B from the ...