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From "Patrick Linskey" <>
Subject RE: Using @GeneratedValue for IDs on already existing tables
Date Tue, 13 Feb 2007 05:51:31 GMT
How do you currently generate your values? If you use some sort of
database-side logic (sequence, auto-assigned columns, hi-lo table), it
should be trivial for Kodo to interoperate. If you're using some sort of
fancy in-process algorithm, it may be more difficult, but is certainly


Patrick Linskey
BEA Systems, Inc. 

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> -----Original Message-----
> From: Hans J. Prueller [] 
> Sent: Saturday, February 10, 2007 9:24 AM
> To:
> Subject: Using @GeneratedValue for IDs on already existing tables
> As some of you may remember, I am using OpenJPA within an 
> "old" Java2EE
> 1.4/EJB2.1 container to perform
> a step-by-step or bean-by-bean migration from our EJB2.1 CMP 
> entity beans to
> new EJB3 Beans with JPA.
> For the IDs of the Entity Beans we have been using a
> Container-Generated-Value and I plan to continue doing
> so by using the JPA's @GeneratedValue stuff.
> Are there any special issues to consider when using the new 
> openJPA based
> entities with generated values
> on already existing data? In special I mean conflicts of 
> between openJPA
> generated IDs with existing IDs in 
> the underlying table? 
> Hans

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