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Understanding Object-Oriented Systems: Concepts, Evolution, and Databases, Slides of Introduction to Database Management Systems

The fundamental concepts of object-oriented (oo) systems, their relationship with traditional relational and er models, and the features of object-oriented database management systems (oodbms). It covers the evolution of oo concepts, the characteristics of objects, and the impact of oo concepts on data modeling and design.

Typology: Slides

2012/2013

Uploaded on 04/27/2013

sonu
sonu 🇮🇳

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Object Oriented Databases
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Download Understanding Object-Oriented Systems: Concepts, Evolution, and Databases and more Slides Introduction to Database Management Systems in PDF only on Docsity!

Object Oriented Databases

In this chapter, you will learn:

  • What basic concepts govern OO systems
  • How OO features are related to the more traditional relational and ER models
  • What the basic features of an OO database management system (OODBMS) are
  • What effect OO concepts are likely to have on data modeling and design

Object Orientation and Its Benefits

  • A set of design and development principles based on conceptually autonomous computer structures known as objects
  • Each object represents a real-world entity with the ability to act upon itself and interact with other objects
  • Modularity is therefore almost inevitable

Object Orientation

Contributions

The Evolution of Object Oriented

Concepts (continued)

  • Object oriented programming languages were developed to: - Provide an easy-to-use software development environment - Provide a powerful software modeling tool for application development - Decrease development time by reducing the amount of code - Improve programmer productivity by making that code reusable

The Evolution of Object Oriented

Concepts (continued)

  • Object oriented environment has several important attributes: - Data set is no longer passive - Data and procedures are bound together, creating an object - Object has an innate ability to act on itself

Objects: Components and

Characteristics

  • Object:
    • Abstract representation of a real-world entity
    • Has:
      • Unique identity
      • Embedded properties
      • Ability to interact with other objects and act upon itself
    • Defining characteristic is its unique identity

Real-World Student

Objects

Attributes (Instance Variables)

  • Attributes:
    • Known as instance variables in OO environment
  • Domain:
    • Logically groups and describes the set of all possible values that an attribute can have

Object Attributes

Messages and Methods

  • Method:
    • Code that performs a specific operation on object’s data
    • Protects data from direct and unauthorized access by other objects
    • Used to change the object’s attribute values or to return the value of selected object attributes
    • Represent real-world actions Docsity.com

Depiction of an Object

Objects Send Messages

to Each Other

Classes

  • Collection of similar objects with shared structure (attributes) and behavior (methods)
  • Class instance or object instance
    • Each object in a class