Information Technology Reference
In-Depth Information
Relation Section
SS#
* Course
Section#
Lecture_hour
415223641
CS101
1
30
613557642
CS101
2
30
Relation Graduate Student
Student#
Degree_to_be
012888
M.Sc.
120008
Ph.D.
Relation Student
Student#
Student_name
Sex
012888
Paul Chitson
M
120008
Irene Kwan
F
117402
John Lee
M
Relation Enroll
* Student
* Course
SS#
Section#
Year
Grade
012888
CS101
415223614
1
1995
A
120008
CS101
613557642
2
1996
B
Its semantic model can be represented by the following extended entity relationship
model in Fig. 4.11 .
By using the methodology in Chap. 3, we can convert these relations into class
objects as follows:
Step 1—Translate relational schema to object-oriented schema.
The result of translating the relational schema into the object-oriented model are
shown in an UML diagram in Fig. 4.12 .
 
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