PERSISTENCE

• SEVERAL APPROACHES:
  
  
  • UNIVERSAL: ALL INSTANCES ARE PERSISTENT

  • ORTHOGONAL: ALL CLASSES CAN HAVE PERSISTENT INSTANCES
    • EXPLICIT ACTION MUST BE TAKEN TO MAKE A SPECIFIC INSTANCE PERSISTENT

  • PERSISTENT CLASSES: PERSISTENCY BECOME A CLASS PROPERTY
    • MAPPING BETWEEN PERSISTENT & NON PERSISTENT TYPES REQUIRED

  • PERSISTENCE ISSUES LINKS
  
  

---

Previous: Page 15 Next: Page 16a Up A Level: TOC

Ugo O. Gagliardi
GSD-6306 Spring 2003-2004