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From "C N Davies" <>
Subject RE: Query confusion
Date Sat, 20 Feb 2010 11:49:11 GMT
Thanks for the info Catalina,


I would like to switch to OpenJPA 2.0 Beta but I hit one of the open issues
regarding the class loader. So I'm stuck!







From: catalina wei [] 
Sent: Saturday, 20 February 2010 10:33 PM
Subject: Re: Query confusion


sum(dl.bwCount) * dl.bwRate is a scalar expression.
In Java Persistence 1.0 spec, scalar expression is not allowed to appear as
a select item.  That is why you are getting a syntax error.
JPQL in Java Persistence 2.0 spec has updated the syntax and the scalar
expression can be a select item. This support is available in OpenJPA 2.0.x
Could you try any OpenJPA 2.0.x releases ?


On Sat, Feb 20, 2010 at 12:03 AM, C N Davies <> wrote:

Thanks Daryl,

Pretty obvious, why couldn't I see it!

Now I see my next issue, here is my query truncated down  to the specific

Select sum(dl.bwCount) * dl.bwRate from DLine as dl;

<openjpa-1.2.1-r752877:753278 nonfatal user error>
org.apache.openjpa.persistence.ArgumentException: Encountered "*" at
character 111, but expected: [",", "FROM"].


What is wrong with my "*" symbol? It is documented as supported.

I tried like this:

(sum(dl.bwCount) * dl.bwRate)

Same issue L



From: Daryl Stultz []
Sent: Saturday, 20 February 2010 12:56 AM
Subject: Re: Query confusion

On Fri, Feb 19, 2010 at 8:46 AM, C N Davies <> wrote:


Select Name, Age, EmailAddress, Weight from com.mypackage.User were Age > 25
Using OpenJPA I only know I can query like this:
Select u from User where Age > 25

You can do this in JPA QL:

select, u.age, u.emailAddress, u.weight from User as u

But getResultList()  will return a list if User entities, but  I only want
specific fields as would be returned by my standard SQL above.

My above example will return an Object[]. Not especially easy to use, a Map
would be nice. But there it is.

Daryl Stultz
6 Degrees Software and Consulting, Inc.

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