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 Post subject: Hibernate using hilo instead of seqhilo strategy
PostPosted: Tue Apr 24, 2007 2:05 am 
Newbie

Joined: Sun Apr 22, 2007 10:33 pm
Posts: 11
Hi *,
We are using Hibernate version 3.2.0.ga with Hibernate Annotations 3.2.1.ga with
The database I'm using is Oracle9i.

All the tables in the database have ID of long type. We also have corresponding HIbernate Domain objects that are based on the database schema.

Now, we are trying to use Oracle Sequences to retieve and assign the sequence Ids to the tables (primary key).

For some reason, eventhough hibernate is retieving Oracle Sequence Id (database native), it is using Hibernate generated sequence id. We badly want to use the Oracle (native) sequence Id rather than HIbernate Generated Sequence Ids.

As you can see this is happening despite using "strategy = GenerationType.SEQUENCE" in annotations.

The annotations we are using are as follows

= = = = = = = = = = = = DB TABLE NAME is EMPLOYEE = = = = = = = = = = = = = = = = =
:
@Entity
@Table(name = "EMPLOYEE")
@javax.persistence.SequenceGenerator(name = "EMPLOYEE_STORE", sequenceName = "EMPLOYEE_SEQ")


:
:

@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "EMPLOYEE_STORE")
public Long getId() {
return this.id;
}
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

Any clues on why hibernate is using wrong "Identifier generation strategy" (use hilo strategy instead of seqhilo strategy).

Any help is much appreciate.

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 Post subject:
PostPosted: Tue Apr 24, 2007 5:46 am 
Senior
Senior

Joined: Tue Jul 25, 2006 9:05 am
Posts: 163
Location: Stuttgart/Karlsruhe, Germany
Hi,

In the SequenceGenerator annotation, try adding the following:

Code:
allocationSize = 1, initialValue= 1

In my opinion the allocationSize is the important one.

Cheers,

Andy

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 Post subject:
PostPosted: Thu Apr 26, 2007 3:09 am 
Newbie

Joined: Sun Apr 22, 2007 10:33 pm
Posts: 11
Thanks Andy. That worked like a charm.

However, I'm unsure if this is a bug or 'use-it-the-right-way' thing :-). Any case, it solved my problem. Are there any pointers that are worth reading on this area?

I came across this, that looks similar to my problem...
http://jira.jboss.com/jira/browse/EJBTHREE-597

Theit solution is to use "org.hibernate.annotations" rather than "javax.persistence."
That is use:
-------------------------------- WORK-AROUND??? --------------------------------
@org.hibernate.annotations.GenericGenerator(name="Question_id_sequence", strategy = "sequence",
parameters = { @Parameter(name="sequence", value="S_QUESTION") } )
-------------------------------- FOR --------------------------------
@javax.persistence.SequenceGenerator(name = "Question_id_sequence", sequenceName = "S_QUESTION")

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 Post subject:
PostPosted: Tue May 01, 2007 3:18 pm 
Hibernate Team
Hibernate Team

Joined: Sun Sep 14, 2003 3:54 am
Posts: 7179
Location: Atlanta, USA
this is how it is supposed to work, I agree allocationSize should have a better default...

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