You can use Liquibase for example :
http://www.liquibase.org/
Le jeudi 19 mars 2009 12:00:37, glassfish_at_javadesktop.org a écrit :
> Hello All,
>
> I have a application, which using Persistence (EJB 3.0 implementation). on
> Glassfish. If there are any entity changes (hence change in database
> schema), all the existing tables (w.r.t. entitities) are dropped and new
> tables are created. This result in the loss of Data existing in the Tables.
> Please guide me how to handle this scenario, what are the best practices
> for migration which involved Entity Changes. I dont want to loose the data,
> when I build a new version of application with entity changes.
>
> Thanks in advance.
>
> Regards
> Suyog
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>
> http://forums.java.net/jive/thread.jspa?messageID=337904
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