Question

If I have an entity called Foo that looks a little like this:

@Entity
public final class Foo {
    private int id;
    private String name;
    ...
}

I want to retrieve the names of the Foo objects that have an id greater than 10. If I already have a collection of Foo objects, I could do something like this:

List<Foo> foos = ...
Query filter = session.createFilter(foos, "where id > :id");
filter.setInteger("id", 10);
List filteredFoos = filter.list();

Is there a way to create the above filter such that I would retrieve a list of Strings (i.e. the Foo names) instead of the list of Foos which I would have to manually filter out like so:

for (Foo foo : filteredFoos) {
    String name = foo.getName();
    ...
}

Answer 1

List filteredFoos = session.createFilter(foos, "where id > :id")
                           .setInteger("id", 10).list();
List filteredFooNames = session.createFilter(filteredFoos, "select name").list();

Or try this. I am not sure if this would work, but the former will work definitely.

List filteredFooNames = session.createFilter(foos, "select name where id > :id")
                           .setInteger("id", 10).list();