Object Oriented Databases - Home Pages of [email protected]/~ssirpal/presentations/Session 9...
Transcript of Object Oriented Databases - Home Pages of [email protected]/~ssirpal/presentations/Session 9...
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Object Oriented Databases
Database Systems:
Design, Implementation, and Management,
Seema Sirpal
Delhi University Computer Centre
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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
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You will learn: (continued)
� About the advantages and disadvantages of
OODBMSs
� How OO concepts have influenced the
relational model
� How Oracle9i implements object extensions
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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
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Object Orientation Contributions
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Key Benefits of Object Technology
• Easy maintenance of applications
• Saves money on maintenance
• Faster product development
• Gives company a competitive advantage
• Higher quality of code at a lower cost
• Leads to more satisfied customers
• Reusability of code
• Allows multiple programmers to share a code repository, which saves
time and money
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The Evolution of Object Oriented Concepts
� Object oriented programming
– Developed as an alternative to traditional programming methods
– Programmer creates or uses objects:
� Self-contained, reusable modules that contain data as well as the procedures used to operate on such data
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The Evolution of Object Oriented Concepts (continued)
� Object oriented programming languageswere 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
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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
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Object Oriented Concepts
� Have their roots in programming languages
� No knowledge of programming is necessary
to understand these concepts
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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
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Real-World Student Objects
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Object Identity
� Unique to that object
� Assigned by system at moment of object’s creation
� Cannot be changed under any circumstances
� Can be deleted only if the object is deleted
� Can never be reused
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Object Attributes
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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
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Depiction of an Object
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Method Components
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Objects Send Messages to Each Other
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Classes
� Collection of similar objects with shared
structure (attributes) and behavior (methods)
� Class instance or object instance
– Each object in a class
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Class Illustration
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Musical Instruments Class Hierarchy
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Single Inheritance
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Multiple Inheritance
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Motor Vehicle and Bicycle Instance Variables
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Employee Class Hierarchy Method Override
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Employee Class Hierarchy Polymorphism
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Characteristics of an Object Oriented Data Model
� Support the representation of complex objects
� Are extensible:– Capable of defining new data types as well as
the operations to be performed on them
� Support encapsulation:– Data representation and method’s
implementation must be hidden from external entities
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Characteristics of an Object Oriented Data Model (continued)
� Exhibit inheritance:
– Object must be able to inherit properties (data
and methods) of other objects
� Support the notion of object identity (OID)
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Comparing the OO and ER Model Components
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Shared Representation for All Objects of the Class Person
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State of a Person Object Instance
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Defining Three Abstract Data Types
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Object Representation for Instances of the Class Person with ADTs
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Object State for an Instance of the Class Person, Using ADTs
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Referential Object Sharing
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Class Hierarchy
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Employee Object Representation
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Class Hierarchy for the Retail Corporation
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Representing a 1:M Relationship
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Representing 1:1 and 1:M Relationships
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Employee-Dependent Relationship
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Representing the M:N Relationship
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INVENTORY Table with Predetermined (Base) Data Types
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Inventory Class with Early Binding
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OODM Inventory Class with Late Binding
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OODM and Previous Data Models: Similarities and Differences
� OODM object resembles entity and tuple in the ER and relational models but has additional characteristics
� Class
� Hierarchies
� Encapsulation
� Relationships
� OODM produces a schema in which relations form part of the structure of the database
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An Invoice Representation
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Object Oriented Database Management Systems
� Integrate benefits of typical database
systems with the more powerful modeling
and computational (programming)
characteristics of the object oriented data
model
� Used to develop complex systems
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Object Oriented Database Management Systems
� Result of combining OO features, such as– class inheritance– encapsulation, and
– polymorphism,
� With database features such as– data integrity, -- data manipulation,– security, -- system tuning and– persistence, -- recovery– transaction management, – concurrency control, – backup,
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Object Oriented Database Management Systems
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The Thirteen OODBMS Rules
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How Object Orientation Affects Database Design
� Relational and ER models sometimes cannot adequately represent some objects
� Operations are not a part of the database model
� Object oriented design requires the database description to include objects and their data representation, constraints, and operations
� Few computerized OODB design tools exist
� Lack of standards affects object oriented database design
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OODBMS:Advantages and Disadvantages
� OODBMS occupies a strong market
� Vehicle for technological innovation
� Has not been the beneficiary of market share
growth
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How OO Concepts Have Influenced the Relational Model
� RDBMS is beginning to reach its limits in a
business data environment that is changing
with the advent of mixed-media data storage
and retrieval
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How OO Concepts Have Influenced the Relational Model
� Extended relational model (ERM), or object/relational model (O/RM)
– Extensibility of new user-defined (abstract) data types
– Complex objects
– Inheritance
– Procedure calls (rules or triggers)
– System-generated identifiers (OID surrogates)
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The Next Generation of Database Management Systems
� Likely to incorporate features borrowed from object oriented database systems, artificial intelligence
systems, expert systems, distributed databases, and
the Internet
� Enable future DBMSs to handle more complex
problems with both normalized and nonnormalizeddata
� OODBMS will probably continue to occupy a niche within the database market
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Summary
� Object oriented concepts are derived from OO programming languages
� An object is a conceptual representation of a real-world entity
� Similar objects are grouped in classes
� Classes are organized into a class hierarchy
� Abstract data types are implemented through classes
� The OO data model allows the designer to create a
more authentic representation of real-world objects
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Summary (continued)
� OODBMSs combine OO features with database features
� OODBMSs yield several benefits over conventional DBMSs
– more semantic information in the database
– support for complex objects
– better performance in complex applications
– reusability of classes
– extensibility of the data types supported by the database