persistence.xml create tables only when needed

[Yan Zhou]

Hi,

with persistence.xml specifying table creation strategy, I can have the tables automatically created when deployed.

However, I noticed that when I redeploy the app., it still tries to recreate the table because of the table creation strategy is "create". Should not it be smart enough to know that the tables already exist?

I sure can set the strategy to "None" to avoid creation, but that means I have to change the descriptor file after initial deployment, is there a better solution?


Thanks,
Yan

[Edvins Reisons]

This behavior is controlled by Persistence Provider-specific properties.

For example, for Hibernate you can specify a property

      <property name="hibernate.hbm2ddl.auto"
                value="update"/>

[ December 21, 2006: Message edited by: Edvins Reisons ]