Summary - Using and Understanding Java Data Objects

Summary

The application programmer defines application data classes that become persistence capable through enhancement. The member fields of the application data classes can be managed or unmanaged. JDO allows a wide variety of Java types for managed fields, while unmanaged fields can be any type. Enhancement changes a class considerably, but for the most part, the application can go on using these classes as before except that the application data objects can now be persistent. They can be found in, inserted into, and deleted from the vast, transactional, and persistent datastore that JDO provides access to.

This chapter and the preceding chapters describe all the important features of JDO's persistence service for objects. But how does an application get started with JDO? The application must first obtain an object that implements the PersistenceManagerFactory interface. The next chapter describes this important housekeeping detail.