Re: JDO vs JPA

[James Perkins <jrperkinsjr@xxxxxxxxx>]

Since you have your database question answered (DB2) I'll give my opinion on
JDO or JPA.

I'm not sure if you're using an application server, a servlet container or
running in SE. Either way I would lean towards using JPA. Any Java EE 5 or
above application server has JPA integrated. I know WebSphere Application
Server uses OpenJPA for the JPA implementation.

Both JDO and JPA are just API's. I'm not as familiar with JDO so I don't
know what implementations are out there. I tend to favour JPA as I'm more
familiar with it and it seems to have plenty of implementations. To me JPA
is probably a little more portable since it generates the SQL out of JPQL.

All that said, it really depends on what you are doing. If you're working
with a denormalized database, sometimes JPA is a bit of a pain and standard
JDBC with custom SQL is much better.

--
James R. Perkins


On Fri, Aug 19, 2011 at 02:34, MANUEL FIDALGO SICILIA <
manuel.fidalgo@xxxxxxxxxxxxxxxxxx> wrote:

> Dear all,
>
> Foremost, I would like to say that I'm new to the AS/400 world so sorry
> if I ask stupid things...
>
> At work we are using v6r1m0 and we would to write some Java programs
> using the AS/400 as database.
>
> The problem comes when deciding what persistence engine to use: I can't
> see clearly if the AS/400 is relational or non-relational and I would
> like to know which should be better JPA or JDO. I know some people use
> JPA but I'm wondering if it is not better to use JDO which has support
> for both relational and non-relational and if JPA will have performance
> problems because it is made for relational.
>
> So what do you think? JDO or JPA? Or maybe just jdbc!
>
> Thanks in advance!
>
>
>
> Jose Manuel
>
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