Hibernate Community • View topic - one-to-one to itself

View unanswered posts | View active topics

Board index » Hibernate & Java Persistence » Hibernate Users

All times are UTC - 5 hours [ DST ]

one-to-one to itself

Page 1 of 1

[ 5 posts ]

Previous topic | Next topic

Author

Message

vfrbiker

Post subject: one-to-one to itself

Posted: Sun Sep 25, 2005 4:56 am

Newbie

Joined: Sat Sep 24, 2005 12:24 pm
Posts: 7

Hi all,

I want to declare a One-To-One association to the same class.
Like
Person -> substiude -> Person

my mapping is:

<class name="Person">

<id name="id">
<generator class="native"/>
</id>
<property name="substituteId" unique="true"/>
<property name="name"/>

<one-to-one name="substitude" class="Person"
cascade="all" foreign-key="substituteId"/>
</class>

But no foreign key is genrated to the substitudeId.
What is my mistake?
Can someone help?

Top

ErikFK

Post subject:

Posted: Sun Sep 25, 2005 10:47 am

Pro

Joined: Fri Sep 02, 2005 4:21 am
Posts: 206
Location: Vienna

I think that, in order to achieve your goal, you should use a mapping like:

Code:

<class name="Person">
  <id name="id">
    <generator class="native"/>
  </id>
  <property name="name"/>
  <many-to-one name="substituteId" class="Person" cascade="all" unique="true"/>
</class> 

Erik

Top

vfrbiker

Post subject: Hi

Posted: Sun Sep 25, 2005 12:21 pm

Newbie

Joined: Sat Sep 24, 2005 12:24 pm
Posts: 7

This helps a little bit. Now the foreign key is created but
when I call

Code:

p2.setSubstituteId(1);

I get an exception

Code:

org.hibernate.PropertyAccessException: IllegalArgumentException occurred calling getter of org.hibernate.test.propertyref.Person.id
   at org.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:119)
   at org.hibernate.tuple.AbstractTuplizer.getIdentifier(AbstractTuplizer.java:103)
   at org.hibernate.persister.entity.BasicEntityPersister.getIdentifier(BasicEntityPersister.java:2944)
   at org.hibernate.persister.entity.BasicEntityPersister.isTransient(BasicEntityPersister.java:2705)
   at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:181)
   at org.hibernate.event.def.AbstractSaveEventListener.getEntityState(AbstractSaveEventListener.java:409)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:82)
   at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:69)
   at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:468)
   at org.hibernate.engine.Cascades$5.cascade(Cascades.java:154)
   at org.hibernate.engine.Cascades.cascadeAssociation(Cascades.java:771)
   at org.hibernate.engine.Cascades.cascade(Cascades.java:720)
   at org.hibernate.engine.Cascades.cascade(Cascades.java:847)
   at org.hibernate.event.def.AbstractFlushingEventListener.cascadeOnFlush(AbstractFlushingEventListener.java:121)
   at org.hibernate.event.def.AbstractFlushingEventListener.prepareEntityFlushes(AbstractFlushingEventListener.java:112)
   at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:59)
   at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
   at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:730)
   at org.hibernate.test.propertyref.PropertyRefTest.testOneToOnePropertyRef(PropertyRefTest.java:40)
   at org.hibernate.test.TestCase.runTest(TestCase.java:129)

[/code]

Top

rajasaur

Post subject:

Posted: Sun Sep 25, 2005 12:52 pm

Senior

Joined: Tue Aug 23, 2005 8:52 am
Posts: 181

I think it should be
p2.substituteId(<Person object with ID=1>) instead of p2.substituteId(1).
Since you are mapping Objects here, the Arguments need to reflect the same.

Top

ErikFK

Post subject:

Posted: Sun Sep 25, 2005 1:01 pm

Pro

Joined: Fri Sep 02, 2005 4:21 am
Posts: 206
Location: Vienna

rajasaur wrote:

I think it should be
p2.substituteId(<Person object with ID=1>) instead of p2.substituteId(1).
Since you are mapping Objects here, the Arguments need to reflect the same.

That's correct (except for substituteId which should read setSubstituteId): this is the way the mapping I proposed is meant to be used.

Erik

Top

Page 1 of 1

[ 5 posts ]

Board index » Hibernate & Java Persistence » Hibernate Users

All times are UTC - 5 hours [ DST ]

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum