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How to create and Handle M:N relation with additional link.

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suhaibno

Post subject: How to create and Handle M:N relation with additional link.

Posted: Sun Mar 21, 2010 2:55 am

Newbie

Joined: Sun Mar 21, 2010 2:44 am
Posts: 1

Dear All,

What is the best way to map the below relationship (M:N relation with additional link) in hibernate?

Developer may have more than one skill , and skill can be shared by more than one developer.
I need to hold how many years of experience the developer has in each skill.

Code:

public class Developer{
  private Set skills;
}


public class Skill{

}


public class Knowledge {
   private Developer developer;
   private Skill skill;
   private int experience; // this field holds extra information about both associated entities
}

Thanks & regards
Suhaib

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pb00067

Post subject: Re: How to create and Handle M:N relation with additional link.

Posted: Mon Mar 22, 2010 6:48 am

Expert

Joined: Tue Jun 16, 2009 3:36 am
Posts: 990

The book 'Java Persistence with Hibernate' treats this topic under the section 'adding columns to join tables' , chapter 7.2.3.

There are different 2 approaches to realize this:
1. Mapping the join table to an intermediate entity
2. Mapping the join table to a collection of components

Unfortunately this topic is to complex to report it here (I would have to retype the content of 7 whole pages).

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