conceptual modeling - uow

CSIT115 Data Management and Security

Conceptual ModelingDr Janusz R. Getta

School of Computing and Information Technology -University of Wollongong

Conceptual Modeling file:///Users/jrg/115-2021-SPRING/LECTURES/04conceptualmodeling/04conceptualmodeling.html#2

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Conceptual ModelingOutline

Methodology

Example 1

Example 2

Example 3

Example 4

TOP Created by Janusz R. Getta, CSIT115 Data Management and Security, Spring 2021 2/39


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Methodology

Input: Specification of the requirements (usually a natural languagedescription of a database domain)

Tools: Object Modeling graphical notation

Methods: Systematic transformation of individual components ofspecification of requirements into the components of Object Modelingnotation

Output: Conceptual schema - simplified object class diagram



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Methodology

The transformations of specifications are performed in the followingsequence of steps:

Step 1: Creating classes of objects

Step 2: Creating associations and association classes

Step 3: Creating attributes and link attributes

Step 4: Creating identifiers

Step 5: Creating qualifications

Step 6: Creating generalizations

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Methodology

Example 1

Example 2

Example 3

Example 4



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Example 1

An objective is to create a conceptual schema of a small database thatcontains information about employees and projects

A detailed specification is the following:A group of employees works on the projects

Some of employees supervise other employees

An employee is described by an employee number and their full name

A project is described by a project title, completion date and budget

Employees are identified by their employee numbers and projects are identifiedby the titles

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Example 1


A group of employees works on the projects. Some of employeessupervise other employees. An employee is described by an employeenumber and full name. A project is described by a project title,completion date and budget. Employees are identified by theiremployee numbers and projects are identified by the titles



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Example 1





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Methodology

Example 1

Example 2

Example 3

Example 4



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Example 2

An objective is to create a conceptual schema of a small database thatcontains information about publications such as journals andconference proceedings, published research papers and authors

A detailed specification is the following:A publishing company publishes the journals and conference proceedings

The research papers are included in the journals and proceedings

The company employs the general editors who take responsibility for editingthe research papers

A research paper is written by one or more authors

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Example 2


A publishing company publishes the journals and conferenceproceedings. The research papers are included in the journals andproceedings. The company employs the general editors who takeresponsibility for editing the research papers. A research paper iswritten by one or more authors



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Example 2





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Example 2





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Example 2





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Example 2





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Example 2



Journal, proceedings IS-A publication



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Methodology

Example 1

Example 2

Example 3

Example 4



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Example 3

An objective is to create a conceptual schema of a small database thatcontains information about the construction companies and buildingsbuilt by the companies

A detailed specification is the following:A group of construction companies is involved in the construction of industrialbuildings

A building is located at a different address, it has a unique name andcompletion date

A number of construction stages apply to each building

A construction stage is described by its name, the names of the constructioncompanies involved together with the start date, completion date and the totalcosts

A construction company is usually involved in many construction stages of thesame building

Many construction companies are involved in one construction stage

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Example 3


A group of construction companies is involved in the construction ofindustrial buildings. A building is located at a different address, it has aunique name and completion date. A number of construction stagesapply to each building. A construction stage is described by its name, thenames of the construction companies involved together with the startdate, completion date and the total costs. A construction company isusually involved in many construction stages of the same building. Manyconstruction companies are involved in one construction stage



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Example 3





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Example 3

Step 2 (improved): Creating associations and association classes


If a company is involved in a construction stage that applies to a buildingthen such company is involved in construction of the building



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Example 3

Step 2 (improved): Creating associations and association classes

It means that we do not need an association Involved-in bettwen theclasses COMPANY and BUILDING because such association can bederived from the other two associations



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Example 3





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Example 3



What we know about the reality is that construction companies haveunique names



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Example 3



What we also know about the reality is that a construction stage of abuilding starts once at a given moment in time



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Example 3





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Methodology

Example 1

Example 2

Example 3

Example 4



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Example 4

An objective is to create a conceptual schema for a database domaindescribed by the following poem for kids

"Caterpillar"

by Christina Rossetti

Brown and furry

Caterpillar in a hurry,

Take your walk

To the shady leaf, or stalk,

Or what not,

Which may be the chosen spot.

No toad spy you,

Hovering bird of prey pass by you;

Spin and die,

To live again a butterfly. 32/39


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Example 4


Brown and furry Caterpillar in a hurry Take your walk To the shady leaf,or stalk, Or what not, Which may be the chosen spot. No toad spy you,Hovering bird of prey pass by you; Spin and die, To live again a butterfly.



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Example 4





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References

C. Coronel, S. Morris, A. Basta, M. Zgola, Data Management and Security,Chapters 3 and 4, Cengage Compose eBook, 2018, eBook: DataManagement and Security, 1st Edition

T. Connoly, C. Begg, Database Systems, A Practical Approach to Design,Implementation, and Management, Chapter 16 Methodology -Conceptual Database Design, Pearson Education Ltd, 2015

How to ... ? Cookbook, How to use UMLetlet for conceptual modeling ?Recipe 2.1 How to create very simple conceptual schemas with UMLetlet?

How to ... ? Cookbook, How to use UMLetlet for conceptual modeling ?Recipes 2.2, 2.3, and 2.4 How to do design a conceptual schema withUMLetlet (Design 1, 2, and 3) ?



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conceptual modeling - uow

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