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Transcript of © 2011 Pearson Education, Inc. Publishing as Prentice Hall 1 Chapter 13 (Online): Object-Oriented...
![Page 1: © 2011 Pearson Education, Inc. Publishing as Prentice Hall 1 Chapter 13 (Online): Object-Oriented Data Modeling Modern Database Management 10 th Edition.](https://reader036.fdocuments.net/reader036/viewer/2022062517/56649f005503460f94c16b55/html5/thumbnails/1.jpg)
© 2011 Pearson Education, Inc. Publishing as Prentice Hall 1
Chapter 13 (Online): Object-Oriented Data
Modeling
Modern Database Management10th Edition
Jeffrey A. Hoffer, V. Ramesh,
Heikki Topi
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 2
Objectives Define terms Describe phases of object-oriented development
life cycle State advantages of object-oriented modeling Compare object-oriented model with E-R and EER
models Model real-world application using UML class
diagram Provide UML snapshot of a system state Recognize when to use generalization,
aggregation, and composition Specify types of business rules in a class diagram
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 3
What Is Object-Oriented Data Modeling?
Centers around objects and classes Involves inheritance Encapsulates both data and behavior Benefits of Object-Oriented Modeling
Ability to tackle challenging problems Improved communication between users,
analysts, designers, and programmers Increased consistency in analysis, design, and
programming Explicit representation of commonality among
system components System robustness Reusability of analysis, design, and programming
results
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 4
Progressive and iterative development process
Figure 13-1 Phases of object-oriented systems development cycle
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 5
OO vs. EER Data Modeling
Object Oriented
EER
Class Entity typeObject Entity
instanceAssociation RelationshipInheritance of
attributesInheritance of
attributes
Inheritance of behavior
No representation of behavior
Object-oriented modeling is typically represented using the Unified Modeling Language (UML)
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 6
Classes and Objects Class: An entity that has a well-defined
role in the application domain, as well as state, behavior, and identity Tangible: person, place or thing Concept or Event: department,
performance, marriage, registration Artifact of the Design Process: user
interface, controller, scheduler
Object: a particular instance of a class
Objects exhibit BEHAVIOR as well as attributes Different from entities
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 7
State, Behavior, Identity
State: attribute types and values Behavior: how an object acts and
reacts Behavior is expressed through
operations that can be performed on it Identity: every object has a unique
identity, even if all of its attribute values are the same
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 8
Class diagram shows the static structure of an object-oriented model: object classes, internal structure, relationships
Figure 13-2 UML class and object diagram
a) Class diagram showing two classes
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 9
Object diagram shows instances that are compatible with a given class diagram
Figure 13-2 UML class and object diagram (cont.)
b) Object diagram with two instances
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 10
Operation A function or service that is provided by all
instances of a class Encapsulation – hiding internal
implementation details Types of operations:
Constructor: creates a new instance of a class Query: accesses the state of an object but does
not alter its state Update: alters the state of an object Class-Scope: operation applying to the class
instead of an instance
Operations implement the object’s behavior
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 11
Associations Association
Named relationship among object classes
Association Role Role of an object in an association The end of an association where it
connects to a class Multiplicity
How many objects participate in an association. Lower-bound...Upper-bound (cardinality)
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 12
Figure 13-3Examples of association relationships of different degrees
Lower-bound – upper-bound
Represented as: 0..1, 0..*, 1..1, 1..*
Similar to minimum/maximum cardinality rules in EER
Unary
Binary
Ternary
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 13
Alternative multiplicity representation: specifying the two possible values in a list
instead of a range
Figure 13-4 Examples of binary association relationshipsa) University example
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 14
Figure 13-4 Examples of binary association relationships (cont.)b) Customer order example
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 15
Figure 13-5Object diagram for customer order example
Object diagram shows associations between specific object instances
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 16
Association Class An association that has attributes or
operations of its own or that participates in relationships with other classes
Like an associative entity in E-R model
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 17
Binary association class with behavior
Unary association with only attributes and no behavior
Figure 13-6 Association class and link object a) Class diagram showing association classes
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 18
Association class instances
Figure 13-6 Association class and link object (cont.)b) Object diagram showing link objects
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 19
Figure 13-7 Ternary relationship with association class
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 20
Figure 13-8 Derived attribute, association, and role
Derived attributes and relationships shown with / in front of the name
Derived relationship (from Registers-for and Scheduled-for)
Constraint expression for derived attribute
Derived attribute
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 21
Generalization/Specialization
Subclass, superclass similar to subtype/supertype in EER
Common attributes, relationships, and operations
Disjoint vs. Overlapping Complete (total specialization) vs. incomplete
(partial specialization) Abstract Class: no direct instances possible, but
subclasses may have direct instances Concrete Class: direct instances possible
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 22
Figure 13-9 Examples of generalization, inheritance, and constraints
a) Employee superclass with three subclasses
Shared attributes and operations
An employee can only be one of these subclasses
An employee may be none of them
Specialized attributes and operations
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 23
Figure 13-9 Examples of generalization, inheritance, and constraints (cont.)
b) Abstract Patient class with two concrete subclasses
Abstract indicated by italics
A patient MUST be EXACTLY one of the subtypes Dynamic means a
patient can change from one subclass to another over time
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 24
Class-Scope Attribute
Specifies a value common to an entire class, rather than a specific value for an instance
Represented by underlining
“=“ is initial, default value
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 25
Polymorphism
Abstract Operation: Defines the form or protocol of the operation, but not its implementation
Method: The implementation of an operation
Polymorphism: The same operation may apply to two or more different classes in different ways
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 26
Figure 13-11 Polymorphism, abstract operation, class-scope attribute, and ordering
Class-scope attributes–only one value common to all instances of these classes (includes default values)
This operation is abstract…it has no method at Student level
Methods are defined at subclass level
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 27
Overriding Inheritance
Overriding: The process of replacing a method inherited from a superclass by a more specific implementation of that method in a subclass For Extension: add code For Restriction: limit the method For Optimization: improve code by
exploiting restrictions imposed by the subclass
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 28
Figure 13-12 Overriding inheritance
Restrict job placement
Subclasses that do not override placeStudent use the default behavior
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 29
Multiple Inheritance
Multiple Classification: An object is an instance of more than one class
Multiple Inheritance: A class inherits features from more than one superclass
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 30
Figure 13-13 Multiple inheritance
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 31
Aggregation Aggregation: A part-of relationship
between a component object and an aggregate object
Composition: A stronger form of aggregation in which a part object belongs to only one whole object and exists only as part of the whole object
Recursive Aggregation: Composition where component object is an instance of the same class as the aggregate object
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 32
Figure 13-14 Example of aggregation
A Personal Computer includes CPU, Hard Disk, Monitor, and Keyboard as parts. But, these parts can exist without being installed into a computer. The open diamond indicates aggregation, but not composition.
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 33
Figure 13-15 Aggregation and Composition
(a) Class diagram
(b) Object diagram
Closed diamond indicates composition. The room cannot exist without the building.
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 34
Figure 13-16 Recursive aggregation
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 35
Business Rules See Chapters 2 and 3 Implicit and explicit constraints on
objects – for example: cardinality constraints on association roles ordering constraints on association roles
Business rules involving two graphical symbols: labeled dashed arrow from one to the other
Business rules involving three or more graphical symbols: note with dashed lines to each symbol
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 36
Figure 13-17 Representing business rules
Three-symbol constraint
Two-symbol constraint
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 37
Figure 13-18 Class diagram for Pine Valley Furniture Company
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Chapter 13-Web © 2011 Pearson Education, Inc. Publishing as Prentice Hall 38
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Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall