1. Home
  2. Programming
  3. Java data objects

Chapter 12. Field Management

JDO provides interfaces that allow you to have some control over the management of the fields in a persistent class, including their access and storage. In addition, you can specify how a field with a null value is handled if the underlying datastore does not support null values. JDO metadata controls many of these field-management capabilities.



    		Chapter 1. An Initial Tour
    		Chapter 2. An Overview of JDO Interfaces
    		Chapter 3. JDO Architectures
    		Chapter 4. Defining Persistent Classes
    		Chapter 5. Datastore Mappings
    		Chapter 6. Class Enhancement
    		Chapter 7. Establishing a JDO Runtime Environment
    		Chapter 8. Instance Management
    		Chapter 9. The JDO Query Language
    		Chapter 10. Identity
    		Chapter 11. Lifecycle States and Transitions
    		Chapter 12. Field Management
    		12.1 Transactional Fields
    		12.2 null Values
    		12.3 Retrieval of Fields
    		12.4 Serialization
    		12.5 Managing Fields During Lifecycle Events
    		12.6 First- and Second-Class Objects
    		Chapter 13. Cache Management
    		Chapter 14. Nontransactional Access
    		Chapter 15. Optimistic Transactions
    		Chapter 16. The Web-Server Environment
    		Chapter 17. J2EE Application Servers
    		Appendix A. Lifecycle States and Transitions
    		Appendix B. JDO Metadata DTD
    		Appendix C. JDO Interfaces and Exception Classes
    		Appendix D. JDO Query Language BNF
    		Appendix E. Source Code for Examples