Object-Oriented Database Processing Chapter 17 Object-Oriented Database Processing David M. Kroenke © 2000 Prentice Hall

Object-Oriented Programming OOP; a way of designing and coding programs which views programs as sets of data structures that have both data elements and program instructions Page 483

OOP Terminology Encapsulated complete in itself Encapsulated structure an OOP object that has both attributes (properties) and methods Interface external appearance of an object Page 484

OOP Terminology Implementation “the encapsulated internals of an object” Inheritance “automatically assuming the attributes and methods of another object at a higher class” Polymorphism “situation in which one name can be used to invoke different functions” Page 484

OOP Terminology Object Class “the logical structure of an object (name, attributes, methods)” Object Class Library “a group of object classes” Objects “instances of objects” Transient vs. Persistent “volatile vs. permanent” Page 485

Sample Objects, Methods, and Attributes Page 486 Figure 17-2 © 2000 Prentice Hall

Sample Object Data Structures Page 489 Figure 17-4 © 2000 Prentice Hall

Swizzling “The process of transforming permanent identifiers into in-memory addresses” Page 489

Tasks for Object Persistence Page 489 Figure 17-5 © 2000 Prentice Hall

Application Development Work for Object Persistence Page 492 Figure 17-8 © 2000 Prentice Hall

ODBMS Advantages and Disadvantages Page 493 Figure 17-9 © 2000 Prentice Hall

ODBMS Standards SQL3 “an extension to SQL92 that includes support for OODBMS” Abstract data type “ADT; user-defined structure that is equivalent to an OOP object” Page 495

ODMG-93 “Object Data Management Group; a consortium of object database vendors and experts that developed a definition of interfaces for object data management products in 1993” Page 500

Key Elements of the ODMG Object Model Page 501 Figure 17-15 © 2000 Prentice Hall

ODMG Relationship Operations Page 502 Figure 17-16 © 2000 Prentice Hall