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From Donald Woods <dwo...@apache.org>
Subject Re: Question about JUnit Bi-directional and OneToOne tests
Date Wed, 11 Feb 2009 14:47:24 GMT
Thanks.  I was trying to map the NullRelations testcase from David 
Blevins to an existing junit testcase, but realized after I sent the 
email that David's testcase is using 3 entities and 2 of them are using 
join-columns.


-Donald


Kevin Sutter wrote:
> Don,
> Good question.  A bidirectional one-to-one relationship requires a mappedBy
> element, but only on one side of the relationship.  Not both.  In this
> particular case, the mappedBy element indicates that the BidiChild is the
> owning entity for this relationship (based on the oneToOneParent
> attribute).  A general rule is that the mappedBy element is never on both
> sides of a relationship.
> 
> Kevin
> 
> On Wed, Feb 11, 2009 at 8:19 AM, Donald Woods <dwoods@apache.org> wrote:
> 
>> I would expect the BidiParent/BidiChild entities under -
>>
>> openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/persistence/relations/
>> to have a bi-directional mappedBy annotation for the OneToOne relations,
>> but the child doesn't -
>>
>> BidiParent -
>>    @OneToOne(fetch=FetchType.LAZY, mappedBy="oneToOneParent")
>>    private BidiChild oneToOneChild;
>>
>> BidiChild -
>>    @OneToOne(fetch=FetchType.LAZY)
>>    private BidiParent oneToOneParent;
>>
>>
>> Is this correct?
>>
>>
>> -Donald
>>
> 

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