Question

I have been trying to fetch values from database using IN. I realized that I need to write JPA query like

o.country IN (’UK’, ’US’, ’France’)  

so I tried to write query

List result = Playlist.find("id in ?", values).fetch();  

where values=set of integers

but it fails to compile on runtime

java.lang.ClassCastException: java.util.HashSet cannot be cast to java.lang.Integer   

How do I fix this?

Fixed

I also posted this on google groups and got the answer that seems to work

List<Integer> countries = (list of integers for ’UK’, ’US’, ’France’) 
List result = Playlist.find("id in (:countries)").bind("countries", 
countries).fetch(); 

Answer 1

I’m not alltogether sure about some aspects of your question:

• I don’t know anything about the Playlist class and it’s methods.
• What do you mean by “but it fails to compile on runtime”? Does it fail to compile or does it fail to run?

Anyway here’s an (modified and thus unchecked) example from my codebase:

In an JPA Entity class:
@NamedQuery(name = "findFoo", query = "select f from Foo f where f.state in :stateInList")

There query is used like so:

final Query query = this.entityManager.createNamedQuery("findFoo");
final Set<FooState> states = new HashSet<FooState>(Arrays.asList(FooState.STARTED, FooState.FAILED));
query.setParameter("stateInList", states);
final List<Foo> retval = query.getResultList();
return retval;

HTH