Java Doc for ODMGSessionBean.java in  » Database-ORM » db-ojb » org » apache » ojb » ejb » odmg » Java Source Code / Java DocumentationJava Source Code and Java Documentation

How to use ODMG
To keep this example as simple as possible, we lookup a static OJB ODMG implementation instance on each bean instance. But it's recommended to bind an instance of the Implementation class in JNDI (at appServer start), open the database and lookup this instances via JNDI in ejbCreate(). To use the odmg-api within your bean, you can do:

1. Obtain the current Database from the Implementation instance - Attend
   that there must be already a Database opened before.
   db = odmg.getDatabase(null);
   // ... do something
   
2. Obtain the current odmg-Transaction from the Implementation instance
   to lock objects - Attend that there must be already a Database opened before.
   Transaction tx = odmg.currentTransaction();
   tx.lock(aObject, mode);