Comments on: Investigating Hibernate Associations – One to One

By: Mr. President

Mr. President — Fri, 20 Mar 2009 04:29:10 +0000

My example may not be appropriate, here's something from hibernate docs which should help.

By: jack

jack — Tue, 17 Mar 2009 17:14:50 +0000

Thanks for your time.
Let me further elaborate on the problem.

All primary key ID as assigned by hibernate are set.

The issue is only when phone.setPersonId(this.id);

The personId in Phone is still zero.

Thanks for your help.

By: Mr. President

Mr. President — Tue, 17 Mar 2009 15:48:25 +0000

From an efficiency point of view an update should not be necessary. If you refer to my post, after the one-to-one tag addition mentioned for Person.hbm.xml, I have recommended addition of the following code:

public void setPhone(Phone phone) {
phone.setPersonId(this.id);
this.phone = phone;

}

This should set the personid in the phone table. In case instead of the assigned generator, you are using a database sequence. Refer to hibernate documentation section 5.1.13 for one-to-one mapping. Within the same, have a look at sub-topic primary key association. That should provide a solution. Hope this helps.

By: jack

jack — Mon, 16 Mar 2009 18:33:03 +0000

Thankyou. I am just trying to do that but it the value gets persisted as 0. from the SQL I can see that it triggers a insert but does not trigger a update.

So the value of personid in Phone has value 0.

From what I understand hibernate is suppsoed to late resolve this value but it does not seem to do so. Any idea would be most helpful.

By: Mr. President

Mr. President — Mon, 16 Mar 2009 15:44:23 +0000

Yes. An int can be used instead of a VARCHAR as personid. Refer hibernate documentation section 4.1.2

By: jack

jack — Mon, 16 Mar 2009 14:14:26 +0000

Thanks good article.

Will the one-to-one relationship work if I have an int instead of VARCHAR as personId ?

By: Mr. President

Mr. President — Mon, 23 Feb 2009 10:36:19 +0000

Sorry Toni, your table structure information did not come thru. However you can map your tables to this blog post example and you should be able to get one-to-one mapping done.

By: Toni

Toni — Mon, 23 Feb 2009 09:52:53 +0000

Dear Sir Can you help me to make hobernate ORM, I have 2 table( pp and gudangbarang) I will join 2 table using one-t-one connection, can help me to join this. This is the table and please help me. thanks

By: The YPI

The YPI — Thu, 05 Feb 2009 05:52:08 +0000

Nice intro to one to one mapping…

Thanks

By: soniya

soniya — Mon, 19 Jan 2009 05:46:10 +0000

one-to-one name=”gender” class=”Gender” property-ref=”genderId”

This is the line I have written in person.hbm.xml along with the property and column tags as you have given in the example. I also have written gender.hbm.xml
Hope you will be able to help me out.
wit this much of the info.

Regards
Soniya