unidirectional « Association « JPA Q&A





1. Hibernate unidirectional one to many association - why is a join table better?    stackoverflow.com

In this document (scroll down to the Unidirectional section): http://docs.jboss.org/hibernate/stable/annotations/reference/en/html_single/#entity-mapping-association-collections it says that a unidirectional one-to-many association with a join table is much preferred to just using a foreign key column ...

2. Hibernate: unidirectional, one-to-many associations    coderanch.com

This post is about the hoops I jumped through in order to get Hibernate to set up a unidirectional, one-to-many association mapping to a java.util.List, something I thought would be common, and thus well-supported. In Hibernate in Action, on page 232 I read: Good uses for unidirectional one-to-many associations are uncommon in practice Whoah! Here's my typical example of a one-to-many ...

3. Merge not deleting a unidirectional one-to-one association    forum.hibernate.org

... ...

4. Question Regarding Accessing UniDirectional Associations.    forum.hibernate.org

Need help with Hibernate? Read this first: http://www.hibernate.org/ForumMailingli ... AskForHelp Hibernate version:3.0.5 My question is a more general question. I have a class A linked through a unidirectional 1-* association to class B. At the DB level, i have a foreign key in the class B which is the primary key of class A. Staying at Class B i want to ...

5. Unidirectional one-to-many association    forum.hibernate.org

Thanks for the answer. I'm not sure the FK is so "polluting" in our case. What about performance issues? Isn't a join table less efficient for performance than just a FK? I think it would be useful if the reference documentation could explain the pros and cons of each of the options, instead of just saying it is "not recommended". Amlie ...

6. unidirectional association with table per concrete class    forum.hibernate.org

I have abstract class A and its 2 concrete subclasses ASub1 and ASub2. There is another class B associated with A. If the association is bidirectional, then we can use or tag in B.hbm.xml But what will be the mapping if the association is unidirectional from A to B??? Please help me with this. It's urgent. Thanks in advance. ...

7. help with unidirectional one-to-many association    forum.hibernate.org

Hello, I've got an unidirectional one-to-many association on a join table like the example of the documentation. Hibernate version: 3.0.5 Mapping documents: Code: These are the tables: Code: create table Person ( ...

8. Need help with one to one unidirectional association    forum.hibernate.org

Hibernate version:3.1 Mapping documents: person Hey all Can anyone help me out with the above mapping? I have omitted some other associations in the Person.hbm.xml file ...

9. Unidirectional many-to-one association    forum.hibernate.org

Author Message j4y Post subject: Unidirectional many-to-one association Posted: Thu Jan 25, 2007 9:52 pm Newbie Joined: Thu Jan 25, 2007 9:24 pm Posts: 2 Hey everyone, I'm having a problem creating a simple unidirectional many-to-one association in Hibernate. If there is an example of hibernate mappings and code that I can reference, I would gladly check out those ...





10. unidirectional one-to-many association    forum.hibernate.org

11. multiplicity of unidirectional association    forum.hibernate.org

Hi, Someone please explain me this - From chapter 1 page 17.. It isnt possible to determine the multiplicity of a unidirectional association by looking only at the Java classes. Then the author says .... Java associations can have many-to-many multiplicity. For example, the classes could look like this: public class User { private Set billingDetails; ... } public class BillingDetails ...

12. unidirectional many-to-one association on a join table    forum.hibernate.org

Hibernate version: 3.2.4.sp1 Name and version of the database you are using: MySQL 5.0.27 Hi, I'm trying to model a unidirectional many-to-one association on a join table (as per chapter 7.3.2 of the documentation): Code: ...

13. Unidirectional one-to-many association, again!    forum.hibernate.org

These are examples that I tried: 1) Based on 7.2.3. example from documentation: Code: ...