Re: [eclipselink-users] Does it possible to sync a bean and a table?

[Tom Ware <tom.ware@xxxxxxxxxx>]

Some of the multi-tenant and extensibility work we have been doing is moving in 
the direction of being to alter tables.  At the moment, it is still in the 
planning phases of that part of the project.

One thing you could do with the current code base is define a table that had 
some generic "holder" columns and then take advantage of our extensibility 
support to map dynamically change your mappings to use those columns.

http://wiki.eclipse.org/EclipseLink/Examples/JPA/Extensibility

-Tom

Laird Nelson wrote:
> In JPA?  No.  In EclipseLink?  Sort of.
>
> People on this list are going to point you to the 
> eclipselink.ddl-generation property 
> (http://wiki.eclipse.org/Using_EclipseLink_JPA_Extensions_%28ELUG%29#Using_EclipseLink_JPA_Extensions_for_Schema_Generation).
>
> But bear in mind this will not alter tables.  It will only create them 
> and/or drop them.
>
> You might look at http://www.liquibase.org/ for a database 
> versioning/migration tool.  It is not what you are asking for, but for 
> production support of databases you'll find that automatic initial DDL 
> generation isn't all that great anyway.
>
> Best,
> Laird
>
> On Fri, Sep 23, 2011 at 1:24 PM, Shai Amar <shai.amar@xxxxxxxxxxxxxx 
> <mailto:shai.amar@xxxxxxxxxxxxxx>> wrote:
>
>     Hi
>
>     I want to know if there is a mechanism in JPA that does the following: 
>
>        1. If I'm creating a bean it generate the table automatically
>        2. If I'm changing one of the bean data members, the table
>           columns changing respectively
>
>     And generally, is there a mechanism that enable a synchronization
>     between the bean and the table? 
>
>     -- 
>     Regards
>
>     Shai Amar
>
>     Technologies manager, Founder
>     Krynnlance
>     www.krynnlance.com <http://www.krynnlance.com/>
>     www.backapps.com <http://www.backapps.com/>
>
>
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