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Programmatic discovery of entity EJBs.

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Animal

Post subject: Programmatic discovery of entity EJBs.

Posted: Wed Feb 01, 2006 11:44 am

Regular

Joined: Fri Jan 20, 2006 9:38 am
Posts: 61
Location: Notts, UK

I'm using Hibernate under JBoss/ejb3.

I'd like to be able to discover all the entity EJBs that Hibernate has found in my .par files. Is there a way of asking Hibernate for this info? Or do I have to search for .par files, and use the zip classes to examine them?

What I'm thinking about, is writing some kind of very basic data maintenance tool. It would offer create/update/delete for all known entities.

It would introspect them to find properties that are linked to database columns, see what types they are, and offer basic data manipulation.

How the user would select the rows... that I'm still thinking about. I could write some custom annotation classes to add to @column properties that are to be "keys", and these could be offered to find matches.

Anyway, any ideas?

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Animal

Post subject:

Posted: Wed Feb 01, 2006 12:16 pm

Regular

Joined: Fri Jan 20, 2006 9:38 am
Posts: 61
Location: Notts, UK

Well, it's something to do with getting a

javax.persistence.spi.PersistenceUnitInfo

And calling

getManagedClassNames

List<String> getManagedClassNames()

Returns:
The list of the names of the classes that the persistence provider must
add it to its set of managed classes. Each name corresponds to a
named element in the persistence.xml file.

I imagine that includes managed classes discovered through looking for annotations because we don't name our entities in persistence.xml.

But how does one get a javax.persistence.spi.PersistenceUnitInfo?

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javierpaniza

Post subject:

Posted: Thu Jun 22, 2006 1:39 pm

Beginner

Joined: Fri Jan 14, 2005 7:47 am
Posts: 37
Location: Spain

The next code work for your goal:

Code:

   private static Collection<String> getManagedClassNames() {
      if (managedClassNames == null) {
         // The next code is Hibernate dependent.
         // This code has to be modified in order to work with Glassfish, OpenJPA, etc.
         EntityManager manager = XPersistence.createManager();
         org.hibernate.impl.SessionImpl impl = (org.hibernate.impl.SessionImpl) manager.getDelegate();
         managedClassNames = impl.getSessionFactory().getAllClassMetadata().keySet();
         manager.close();                  
      }
      return managedClassNames;
   }

But it's hibernate dependent. Sorry!

Maybe there is a better way

Cheers
Javier Paniza

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