Problem in Mapping Composite Primary Key with Hibernate

[Reema Patel]

Hi Ranchers,
I'm facing difficulty in mapping a composite key to my domain model, where one key is "assigned" (i-e assigned from the application code) and the other I want to designate as "increment" (the DB should auto assign).

For example, Pls. consider the following code snippet:

  
<composite-id class="CompositeKey" mapped="true">    
<key-property name="project_id" column="project_id" type="int" />
<key-property name="change_seq_num" column="change_seq_num" type="int" >  
</composite-id>  

I've tried embedding the <generator class="increment"> tag inside the <key-property> tag, but, unfortunately it's not supported by Hibernate.

Any help shall be highly appreciated.

Regards,
Reema

[Edvins Reisons]

See here.

[Reema Patel]

Thanks!

[Alejandro Perez]

I have the same problem, and the link you provide is not working, please where I can get the information.

pd: sorry for my english, I'm cuban.

[subodh joshi]

can you plese answer this question i am getting same issue which alredy defined ?and the Link which you posted have no any information
thanksStock market

[Christian Dillinger]

I think thats still true: https://coderanch.com/t/219048/Object-Relational-Mapping/java/composite-id-Hibernate

[subodh joshi]

Thanks Christine for your reply So from the link you provide what i undersatnd we can not use <generator class="increment" /> in the composite key .Is am i right? If yes do you know how can i overcome this issue.
Thanks in advance

[Christian Dillinger]

Taken from chapter 8.4, current Hibernate Reference Doc:
"You cannot use an IdentifierGenerator to generate composite keys. Instead the application must assign its own identifiers."

If the schema definition of <composite-id> does not accept a <generator>-element, there is no way to archive this.

[subodh joshi]

thanks Christian Dillinger for your quick reply.
i m very thankful of you...