Ulf,
Correct. But you may be able to attach this to the home interface where it
makes more sense. Sorry, I'm not sure how to do this, although it should
be easy.
Ciao,
Jonathan O'Connor
"Ulf Tidstrand" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
31.10.2003 11:03
Please respond to jboss-user
To: <[EMAIL PROTECTED]>
cc:
Subject: RE: [JBoss-user] Returning single field as
Collection with EJB QL
Thanks, that made it much clearer!
But then I have a follow-up question: As I've understood, the ejbSelect
methods are only available locally from within the EJB itself. So if I
would like to make a general getAllLastNames() method returning all
LastNames in a table (not associated to a special entity), I should do
the following:
1. Implement an abstract ejbSelectLastNames() method in the bean with a
corresponding EJB QL statement
2. Implement a getLastNames() as an interface method in the EJB which in
turn calls the ejbSelectLastNames() method
3. When I want to invoke the getLastNames() method from a client, I
first have to find an arbitrary entity bean and then invoke the method
from that bean.
Is that right?
Regards,
Ulf
-----Original Message-----
From: Jonathan.O'[EMAIL PROTECTED] [mailto:Jonathan.O'[EMAIL PROTECTED]
Sent: den 31 oktober 2003 11:31
To: [EMAIL PROTECTED]
Subject: Re: [JBoss-user] Returning single field as Collection with EJB
QL
Ulf,
You need an ejb.select instead. Finders are defined to return the Entity
Bean interface (local or remote). Select() lets you find non entity bean
stuff.
to be more specific, in an Entity Bean, FooBean, finders always return
FooRemote or FooLocal objects. Use ejb.Select to return other stuff such
as your last names.
Ciao,
Jonathan O'Connor
XCOM Dublin
"Ulf Tidstrand" <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED]
31.10.2003 07:47
Please respond to jboss-user
To: <[EMAIL PROTECTED]>
cc:
Subject: [JBoss-user] Returning single field as
Collection
with EJB QL
Hi everyone,
I have declared a simple EJB QL statement in xdoclet:
* @ejb.finder
* signature="java.util.Collection findAllLastNames()"
* query="SELECT DISTINCT u.lastName FROM user AS u"
The lastName field is of type String, so I thought that this statement
would return all uniqe last names in the table as a Collection of
String.
However it seems to return a Collection of local interfaces instead.
That?s fine, but the problem is that the primary key fields are not set
in
those local interfaces so whenever I try to fetch the ?lastName? field
with getLastName() from the local interface, Jboss throws a couple of
exceptions telling me that the primary key is null.
If I invoke the toString() method of the local interfaces I get the JNDI
name of the EJB followed by the content of the lastName field, so the
information is obviously there, but I can?t get it out in a clean way.
What am I doing wrong?
I?m using JBoss 3.2.2 (final production version).
Regards,
Ulf
Ulf Tidstrand
Software Engineer
IMI - Industrial Environmental Informatics
Chalmers University of Technology
Voice +46 31 772 4914
Fax +46 31 772 4915
E-mail [EMAIL PROTECTED]
Web www.imi.chalmers.se
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