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Chapter 17Object-Oriented
Database Processing
David M. Kroenke
Database Processing
© 2000 Prentice Hall
Chapter 17
© 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
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Chapter 17
© 2000 Prentice Hall
OOP Terminology
• Encapsulated complete in itself• Encapsulated structure an OOP
object that has both attributes (properties) and methods
• Interface external appearance of an object
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© 2000 Prentice Hall
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”
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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”
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Sample Objects, Methods, and Attributes
Page 486Figure 17-2 © 2000 Prentice Hall
Sample Object Data Structures
Page 489Figure 17-4 © 2000 Prentice Hall
Chapter 17
© 2000 Prentice Hall
Swizzling
“The process of transforming permanent identifiers into in-memory addresses”
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Tasks for Object Persistence
Page 489Figure 17-5 © 2000 Prentice Hall
Application Development Work for Object Persistence
Page 492Figure 17-8 © 2000 Prentice Hall
ODBMS Advantages and Disadvantages
Page 493Figure 17-9 © 2000 Prentice Hall
Chapter 17
© 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”
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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”
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Key Elements of the ODMG Object Model
Page 501Figure 17-15 © 2000 Prentice Hall
ODMG Relationship Operations
Page 502Figure 17-16 © 2000 Prentice Hall
