Re: [eclipselink-users] Overwrite session manager settings

[Jaka Jančar <jaka@xxxxxxxxx>]

Tom,

is it possible to specify the database server on an EntityManager basis?

In other words, what can you do if you want to connect to loads of  
different hosts, but don't want to recreate EntityManagerFactory for  
each one (since that takes ages).

Jaka

On 19. Mar 2009, at 19:23, Tom Ware wrote:

> Hi Phil,
>
>  In EclipseLink, EntityManagerFactory holds the object that controls  
> database connections.  As a result you need to provide the database  
> properties to the EntityManagerFactory at creation time.  (In the  
> bootstrap API, a Map can be provided to the  
> Persistence.createEntityManagerFactory(String, Map) method.)
>
>  If you need to regulate these things on an EntityManager basis,  
> there is some EclipseLink specific API that can be used to do that,  
> but for most people, the general API is sufficient.
>
> -Tom
>
> Philipp Kursawe wrote:
> > Is it possible to overwrite the settings made in the  
> > persistence.xml when creating the EntityManager using an  
> > EntityManagerFactory.create(Map)?
> > It seems like that the properties I am handing in are not valued.
> > Is it in any other way possible to set certain persistence.xml  
> > values from within the program? I mean I cannot seriously be asked  
> > to put login credentials inside a JAR?
> > I would like the user to configure those values and feed them to  
> > EclipseLink programmatically not from the persistence.xml.
> > Thanks for your help!
> > Phil
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