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From Tom Mutdosch <>
Subject Re: possible to write a JPA Query to that filters both an Entity and its relationship entities?
Date Fri, 23 Feb 2007 21:57:48 GMT
Hi Patrick,
Thanks for the query suggestion.  I guess what I was initially thinking 
of doing was incorrect in that JPA doesn't really give me a "view" of 
what I want.  That is, I can never get a Department object containing a 
list of filtered Employees.  A JPA object returned from a query is 
always going to be an exact representation of the database.  So your 
Department object is always going to contain all of the Employees in its 

So like you mentioned, I can still get all the information using one 
query, and then just process those results as I want them.  I imagine 
that this would entail some sort of wrapper bean that would house the 
Department and the filtered list of Employees.  Or what if I added a 
regular method to my Department entity called getFilterEmployees() which 
would return a List that I populated with the filtered results from my 
query?  Does that seem like a reasonable thing to do -- if I didn't want 
to deal with a wrapper object but still have all of my desired data 
captured by a single Entity? 


Patrick Linskey wrote:
> It is, but it doesn't buy you much in this situation -- the oldTimers
> collection in your example won't be filtered to just the ones that are
> old. It'll be all the employees in the dept.
> -Patrick

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