Hibernate Community • View topic - How to map a table without primary key

View unanswered posts | View active topics

Board index » Hibernate & Java Persistence » Hibernate Users

All times are UTC - 5 hours [ DST ]

How to map a table without primary key

Page 1 of 1

[ 4 posts ]

Previous topic | Next topic

Author

Message

xinxin

Post subject: How to map a table without primary key

Posted: Mon Mar 15, 2004 11:04 am

Beginner

Joined: Tue Sep 09, 2003 5:28 pm
Posts: 33
Location: Cincinnati, OH

Hi there,

I have two tables, and I just want to use read only cache on them. However, these two tables do not have primary keys, anyone know how to solve this problem?

I am using the Hibernate 2.1

Thanks so much!

Top

anthony

Post subject:

Posted: Mon Mar 15, 2004 11:07 am

Hibernate Team

Joined: Thu Dec 18, 2003 9:55 am
Posts: 1977
Location: France

Maybe use coposite key on all attributes ????

can you have the same row twice?

Top

xinxin

Post subject:

Posted: Mon Mar 15, 2004 12:30 pm

Beginner

Joined: Tue Sep 09, 2003 5:28 pm
Posts: 33
Location: Cincinnati, OH

Thank you delpouve for the reply.

We'll never have the same row twice, so I am able to use composite id.

Thanks a lot!

Top

anthony

Post subject:

Posted: Mon Mar 15, 2004 12:47 pm

Hibernate Team

Joined: Thu Dec 18, 2003 9:55 am
Posts: 1977
Location: France

i think you'll have overhead using such a composite id, but try it.
Don't forget equals/hashcode, note that you musn't use all the composites id attributes to write these method, only use "business" identity

Anthony

Top

Page 1 of 1

[ 4 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