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From Kaeto23 <kaet...@yahoo.de>
Subject Re: ejbSelect tutorial?
Date Tue, 24 Oct 2006 06:46:26 GMT
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Hello, Lasantha

sure, no problem. I attach the 2 source files for the 2 CMPs. Keep in
mind that I'm german (see all the descr's) :)

Best regards

Dirk

Lasantha Ranaweera schrieb:
> Hi Dirk,
> 
> Would you mind sharing your code with us?
> 
> Thanks,
> Lasantha Ranaweera
> 
> Kaeto23 wrote:
>> Hello,
>>
>> OK, I tried your way now and at least Geronimo keeps talking to me. The
>> stacktrace now reads as follows:
>>
>> Caused by: org.tranql.ql.QueryException: Select [Select
>> method=[ejbSelectForumPostsNum]; EJB-QL=[select distinct count(p.id)
>> from Post as p where p.thread.forum.id=?1]] does not return a EJB and
>> defines the prefetch group [Default].
>> 	at
>> org.tranql.builder.SQLQueryBuilder.buildSelects(SQLQueryBuilder.java:224)
>> 	at
>> org.openejb.deployment.CMPContainerBuilder.buildIt(CMPContainerBuilder.java:311)
>> 	at
>> org.openejb.deployment.AbstractContainerBuilder.createConfiguration(AbstractContainerBuilder.java:354)
>> 	at
>> org.openejb.deployment.CMPEntityBuilder.createBean(CMPEntityBuilder.java:213)
>> 	... 32 more
>>
>>
>> It seems Geronimo wants a EJB in return. Counting is still a problem ;)
>>
>> I just consider to switch to JOnAS or JBoss ;)
>>
>> Milan: how did you count the EJBs? Do you also use the "Default"
>> prefetch group (only the CMP fields are loaded instead of CMP+CMR)?
>>
>> Best regards
>>
>> Dirk
>>
>>
>> Unger, Milan schrieb:
>>   
>>> Hello, 
>>>
>>> I faced similar problem, the trick to use following EJB QL: 
>>>  
>>> select distinct count(p.key) from Post as p where
>>> p.thread.forum.id=?1
>>>
>>> notice count(p.key) - where key should be a property of CMP bean. 
>>> I'm not sure if such syntax is required by EJB spec or simply a bug in
>>> geronimo/open-ejb.
>>>
>>> Regards, Milan. 
>>>
>>> -----Original Message-----
>>> From: Kaeto23 [mailto:kaeto23@yahoo.de] 
>>> Sent: Thursday, October 19, 2006 6:55 PM
>>> To: Geronimo ML
>>> Subject: ejbSelect tutorial?
>>>
>>> Hello,
>>>
>>> today I started to work on a CMP that also provides a ejbSelect for
>>> counting some contents from a database. Basically, a CMP named Post
>>> which should count how much entries exist in the database.
>>>
>>> Nothing so hard ;)
>>>
>>> Anyway, Geronimo has some trouble to use the EJB so I'd like to know
>>> WHAT is the problem :/
>>>
>>> Here the code snippet that, when not commented out, makes the trouble:
>>>
>>>
>>>
>>>
>>> @XD5EjbSelectMethode(descr = "returns the number of entries", ejbQL =
>>> "select distinct count(p) from Post as p where p.thread.forum.id=?1")
>>> public abstract long ejbSelectForumPostsNum(long forumId) throws
>>> FinderException;
>>>
>>>
>>>
>>> Now XD5 creates the following deployment descriptor entries:
>>>
>>> ejb-jar.xml:
>>> ...
>>> <query>
>>> 	<description>returns the number of entries</description>
>>> 	<query-method>
>>> 		<method-name>ejbSelectForumPostsNum</method-name>
>>> 		<method-params>
>>> 			<method-param>long</method-param>
>>> 		</method-params>
>>> 	</query-method>
>>> 	<ejb-ql>select distinct count(p) from Post as p where
>>> p.thread.forum.id=?1</ejb-ql>
>>> </query>
>>> ...
>>>
>>> openejb-jar.xml
>>> ...
>>> <query>
>>> 	<query-method>
>>> 		<method-name>ejbSelectForumPostsNum</method-name>
>>> 		<method-params>
>>> 			<method-param>long</method-param>
>>> </method-params>
>>> 	</query-method>
>>> 	<group-name>Default</group-name>
>>> </query>
>>> ...
>>>
>>> If these lines are present, Geronimo will crash with this exception:
>>>
>>> Caused by: java.lang.ClassCastException: org.tranql.ql.EntityReference
>>>         at
>>> org.tranql.ejbqlcompiler.PathTransformer$Context.<init>(PathTransformer.
>>> java:401)
>>>         at
>>> org.tranql.ejbqlcompiler.PathTransformer$Context.<init>(PathTransformer.
>>> java:380)
>>>         at
>>> org.tranql.ejbqlcompiler.PathTransformer.visit(PathTransformer.java:73)
>>>         at org.tranql.ql.Query.visit(Query.java:59)
>>>         at
>>> org.tranql.ejbqlcompiler.InterRepresentationTransformer.transform(InterR
>>> epresentationTransformer.java:41)
>>>         at
>>> org.tranql.ejbqlcompiler.DerbyEJBQLCompilerFactory$DerbyEJBQLCompiler.tr
>>> ansform(DerbyEJBQLCompilerFactory.java:69)
>>>         at
>>> org.tranql.sql.EJBQLToPhysicalQuery.expandToSQLQuery(EJBQLToPhysicalQuer
>>> y.java:243)
>>>         at
>>> org.tranql.sql.EJBQLToPhysicalQuery.buildSelect(EJBQLToPhysicalQuery.jav
>>> a:171)
>>>         at
>>> org.tranql.sql.EJBQLToPhysicalQuery.buildSelects(EJBQLToPhysicalQuery.ja
>>> va:109)
>>>         at
>>> org.tranql.builder.SQLQueryBuilder.buildSelects(SQLQueryBuilder.java:204
>>> )
>>>         at
>>> org.openejb.deployment.CMPContainerBuilder.buildIt(CMPContainerBuilder.j
>>> ava:311)
>>>         at
>>> org.openejb.deployment.AbstractContainerBuilder.createConfiguration(Abst
>>> ractContainerBuilder.java:354)
>>>         at
>>> org.openejb.deployment.CMPEntityBuilder.createBean(CMPEntityBuilder.java
>>> :213)
>>>
>>>
>>> So, basically, do you have some examples or tutorials that show the
>>> usage of ejbSelects with Geronimo 1.1.1? Let me know :)
>>>
>>> Best regards
>>>
>>> Dirk
>>>
>>>
>>> 	
>>>
>>> 	
>>> 		
>>> ___________________________________________________________ 
>>> Der frhe Vogel fngt den Wurm. Hier gelangen Sie zum neuen Yahoo! Mail:
>>> http://mail.yahoo.de
>>>
>>>     
>>
>>   
> 

- --
Kaeto23

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