Hql how to cast number to varchar2

Hello.
How to cast number to varchar2(to string)? I'm using hql toplink implementation and (don't know why) functions like cast(... as ...), to_char(...) and str(...) don't work. Please help me.
Kuba :).
Edited by: 854998 on 2011-04-27 03:12

Hello Chris.
First of all I'd like to thank you for answer. :)
1)I can't use native query.
2)What do you mean?
3)I can't upgrade.
I have something like this(it's only simple example, I have more complex query):
getManager().createQuery("SELECT obj FROM " + EntityClass.class.getSimpleName() + " obj "
+ " WHERE '14' = obj.number").getResultList();
r.number is Number in Oracle and Long in entity class.
I want to cast obj.number to String.
Here: http://docs.jboss.org/hibernate/core/3.3/reference/en/html/queryhql.html#queryhql-expressions expressions like cast is valid.
So, where's the problem? My toplink version is too old?
Thanks a lot
Kuba.

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