Hibernate version:3.2

We are using HibernateTools to reverse engineer our DB. Our application uses detached objects with automatic versioning so we need to identify the versioning column in the hibernate mapping file.

The problem I am running into is that every time I reverse engineer, and a new mapping file is created, it wipes out the <version ... /> tag. Is there some way to use Hibernate Tools so I don't have to add these tags back each time?

Are there any other reverse engineering tools out there that would better handle this situation?

thanks,

Hi Nealc,

I think you will find hibernate tools to be the most complete reverse engineering solution (if not let me know and we will fix that ;)

With respect to version columns then today if you enable optimistic locking detection then columns named VERSION or TIMESTAMP (with the proper types) is automatically marked as <version/> or <timestamp/>

If that does not fit your needs then you can implement a custom ReverseEngineeringStrategy with one of the two methods implemented:

public String getOptimisticLockColumnName(TableIdentifier identifier);

or

public boolean useColumnForOptimisticLock(TableIdentifier identifier, String column);


The first one is to explicit name a column for a certain table and the second one is used when you have optimistic lock autodetection enabled where the reverse engineering will run through all the columns of a table to find it (if any at all).

Thanks.

I agree HibernateTools is the best tool for reverse engineering that I've found.

Am I correct in thinking that in order to implement a custom ReverseEngineeringStrategy I need to use ANT rather than the Eclipse plugin?

Also, we would like to store constants (public static final) in our model files. Values such as MAX_RESULTS or TYPE_LOCAL_USER that relate to a specific column within a specific table. We do not want these values overwritten each time we reverse engineer. Can this be accomplished by implementing a custom ReverseEngineeringStrategy?

Thanks,

Ah yes, one more thing. :)

Where do I get more information regarding the functionality of the DelegatingReverseEngineeringStrategy and ReverseEngineeringStrategy classes. Is there API documentation available?

Thanks,

Nope; the eclipse plugin also supports reverse engineering strategy.



specific additionas to the code is possible in a couple of different ways:

1) use reveng.xml and put in meta tags for extra-code (or revengstrategy directly and implement tableToMetaAttributes)

2) customize the templates for the java code generation.


With respect to api docs then we should probably include that in the online help.

OK.
How do I indicate to the Eclipse pluging that it should use my custom ReverseEngineeringStategy?

Is there any API documentation on the classes ReverseEngineeringStrategy and DelegatingReverseEngineeringStrategy? Without API documentation it's hard to know where to start.

Thanks again, :)

The api docs are in the source; just not any public generation of it (yet).

With respect to where to specify the revengstrategy then see this screenshot from the docs:

http://www.hibernate.org/hib_docs/tools ... le/#d0e259