Transcript Pertemuan 24 Object database design (Lanjutan bagian 3) Matakuliah

Matakuliah
Tahun
Versi
: M0174/OBJECT ORIENTED DATABASE
: 2005
: 1/0
Pertemuan 24
Object database design (Lanjutan
bagian 3)
1
Learning Outcomes
Pada akhir pertemuan ini, diharapkan mahasiswa
akan mampu :
• Mahasiswa dapat Menunjukkan konsep
relational data model (C3)
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Outline Materi
•
•
•
•
•
Identifying relationship
Identifying attributes
Operations
State diagram
Scenario
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Identifying relationship
• The next design task is to determine the
relationships which can exist between the
objects
• There are a few common verbs that can
be good indicators of relationships
between objects:
Is a
Aggregation
has
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Identifying attributes
• The attributes of a class are all the facts or
things that are known about an object that
are not represented by relationships to
other objects
• Identification of attributes may require
more detailed descriptions of individual
object types
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Identifying attributes
Bicycle tyre attributes
Material
Colour
Widht
Diameter
Tread
Manufacturer
Bike
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Operations
• The behavioral semantics of an entity type
refers to the things that can be happen to
its instances during their lifetime.
• This information is represented as a set of
object operations which provide the
interface to the object.
• Analysis of behavioral semantics is done
by analyzing the changes that can occur to
an object during its lifetime
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State diagram
• Example
3 months
Bad debtor
Payment
received
Unpaid
Paid
Create(…)
Payment
received
Archived
End of tax
year
5 years
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Scenario
• The designer may arrive at, or test the
correctness of , a state diagram by running
through a number of scenarios
• A scenario shows the use of the object
database system within a particular
situation
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SUMMARY
• Objects are inferred from nouns and noun
phrases, grouped, and refined
• Analysis of behaviour is represented as
state diagrams, and is analyzed through
scenario, which are represented using
message diagrams and object message
diagrams
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