Jerry and Dain,
You might want to try our workaround.
We have 2 entities A and B. A's primary key is also a foreign key to B. There is a 1-1 or 1- zero or one relationship between A and B.
I implemented an ejbSelectB() method in A, and then called this from A.getB(). Because the foreign key is also the primary key, the relationship between A and B, once set up can't be changed, i.e. it is a read-only relationship.
The nice thing about this workaround is that it is very easy to program, and it leaves client code of A the same.
Hope this helps,
Jonathan O'Connor
Ph: +353 1 872 3305
Mob: +353 86 824 9736
Fax: +353 1 873 3612
| Dain Sundstrom <[EMAIL PROTECTED]>
Sent by: [EMAIL PROTECTED] 25.06.2002 17:34
|
To: [EMAIL PROTECTED] cc: Subject: Re: [JBoss-user] CMR bug fixed? |
This has never been supported. Some people have described hacks around
this, but I do not recommend them, as you can end up with an
inconsistent database state. Support for this is on the todo list.
-dain
Jerry Smith wrote:
> I've been trying to follow what got fixed for CMR in Branch_3_0 and seem to
> have gotten lost ;-) Is the fix for allowing a column to be part of a
> primary key, be a foreign key, and have a CMR use that column? What I'm
> seeing in the Branch_3_0 is that I'm getting 2 columns with the same name,
> one nullable the other not. Or is there something wrong with my config
> files?
>
> Thanks, and sorry if I'm beating a dead horse!
>
> -Jerry
>
> -----Original Message-----
> From: Dain Sundstrom [mailto:[EMAIL PROTECTED]]
> Sent: Monday, June 24, 2002 6:58 PM
> To: [EMAIL PROTECTED]
> Subject: Re: [JBoss-user] CMR bug fixed?
>
>
> It looks like you have an out of date standardjbossmcmp-jdbc.xml file or
> you have written your own type mapping in your jbosscmp-jdbc.xml file.
> The true-mapping element contains the string to which true values in
> EJB-QL are mapped; there related element false-mapping for false values.
>
> Branch_3_0 builds for me. Maybe you got a half committed version again.
> Update the entire tree again, "./build.sh clean", and "./build.sh".
>
> -dain
>
> Douglas Su wrote:
>
>>Dain and Stephen,
>>
>> First of all, thank you very much guys. Okay, I checked out the
>>"jboss-all" source from both "HEAD" and "Branch_3_0." The one from
>>"Branch_3_0" can not be successfully build. It gives 6 errors and 3
>>warnings. The one from "HEAD" had no problem when I build it. However
>>it gives me problem when I try to deploy a single simple entity bean
>>(with no relations). The delpoyment errors was:
>>
>>16:34:03,011 ERROR [EjbModule] Starting failed
>>org.jboss.deployment.DeploymentException: expected one true-mapping tag
>> at org.jboss.metadata.MetaData.getUniqueChild(MetaData.java:95)
>> at
>>org.jboss.metadata.MetaData.getUniqueChildContent(MetaData.java:198)
>> at
>>org.jboss.ejb.plugins.cmp.jdbc.metadata.JDBCTypeMappingMetaData.<init
>>
>>
>>>(JDBCTypeMappingMetaData.java:130)
>>
>> at
>>org.jboss.ejb.plugins.cmp.jdbc.metadata.JDBCApplicationMetaData.<init
>>
>>
>>>(JDBCApplicationMetaData.java:202)
>>
>>
>>....
>>
>>Any suggestion? Comment?
>>
>>Thank you very much,
>>
>>Douglas
>>
>>
>>>From: Dain Sundstrom <[EMAIL PROTECTED]>
>>>Reply-To: [EMAIL PROTECTED]
>>>To: [EMAIL PROTECTED]
>>>Subject: Re: [JBoss-user] CMR bug fixed?
>>>Date: Mon, 24 Jun 2002 11:54:56 -0500
>>>
>>>Yes that is HEAD, but I agree with Stephen Coy in that you should only
>>>use this version if you are interested in developing JBoss. As for
>>>the problems you have, I suggest you update the code again and
>>>recompile. You may have checked out the code in the middle of another
>>>developer's commit.
>>>
>>>-dain
>>>
>>>Douglas Su wrote:
>>>
>>>
>>>>Dain,
>>>> I've checked out JBoss-all module and I compiled a jboss3.1.0alpha
>>>>version. Is this the correct version? Is the CMR bug fixed for this
>>>>version? Is this the "Branch_3_0 and Head" you are talking about?
>>>>This version seems to give me some error on ejb-management.jar and
>>>>jmx-ejb-adaptor.jar when I starts the server. Any Suggestion?
>>>>
>>>>Thank you very much,
>>>>Douglas
>>>>
>>>>
>>>>
>>>>>From: Dain Sundstrom <[EMAIL PROTECTED]>
>>>>>Reply-To: [EMAIL PROTECTED]
>>>>>To: [EMAIL PROTECTED]
>>>>>Subject: Re: [JBoss-user] CMR bug fixed?
>>>>>Date: Thu, 20 Jun 2002 11:50:27 -0500
>>>>>
>>>>>Yep, if you execute a finder before the field is set the database is
>>>>>not updated. This has been fixed in cvs Branch_3_0 and HEAD. cvs
>>>>>is covered in the Quick Start guide.
>>>>>
>>>>>-dain
>>>>>
>>>>>Douglas Su wrote:
>>>>>
>>>>>
>>>>>>Hi All,
>>>>>>
>>>>>> Is there a bug with the CMR field? Is the bug fixed? I am having
>>>>>>trouble creating 1:N relationship. JBoss creates Null field and I
>>>>>>can't make a foreign key be apart of a primary key. Any Suggestions?
>>>>>>
>>>>>>Thanks,
>>>>>>Douglas
>>>>>>
>>>>>>
>>>>>>_________________________________________________________________
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>>>>>
>>>>>
>>>>>
>>>>>
>>>>>--
>>>>>xxxxxxxxxxxxxxxxxxxxxxxx
>>>>>Dain Sundstrom
>>>>>Chief Architect JBossCMP
>>>>>JBoss Group, LLC
>>>>>xxxxxxxxxxxxxxxxxxxxxxxx
>>>>>
>>>>>
>>>>>
>>>>>-------------------------------------------------------
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>>>>> >>> http://thinkgeek.com/sf <<<
>>>>>
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>>>>
>>>>
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>>>>
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--
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Dain Sundstrom
Chief Architect JBossCMP
JBoss Group, LLC
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