MET CS 669 Term Project Iteration 1
Project Introduction
Can you design, implement, and start using your very own database, all in one course term? You can,
even if you have never touched a database in your life! The theoretical concepts and applied skills you
learn throughout the course prepare you well for this task, and have been carefully crafted and
sequenced for rapid learning. Further, the teaching team stands ready to help fill any gaps, so you are
not dependent on the course materials alone. You will undoubtedly put in many hours of hard work on
this project, but you will leave the course with your own database, and more importantly, the skills to
build other ones.
The start‐to‐finish experience you gain from this project will help prepare you for database work in the
industry or academia. If your boss asks you to develop a database, you’ll know how and have the
experience to back up your confidence. If you decide to pursue database research, you’ll have a solid
foundation. Take this project to heart. It will pay off!
The remainder of this document provides you important details on getting started with your project. For
this first iteration, you will decide what kind of data you want to capture in your database and provide
an overview of your project. Read through this document carefully and ask the teaching team if
something is unclear. You will be spending a lot of time designing, implementing, and testing a database
for this project.
What Is A Database Used For?
Before you create your own database, we need to address an obvious question: what is a database used
for? Most are aware that organizations use databases to store data long term, but may not be aware
that databases also provide the critical features of data security and efficient access. Databases ensure
that only authorized people can make use of the data, typically with extensive and customizable data
security configurations. Databases also ensure that just the right data items can be retrieved quickly
(typically in less than a second) from amongst a potentially vast amount of storage. This sets databases
apart from file‐based data storage.
The next important question is, who, or what, accesses the database in an organization? Broadly, a
database is accessed either by I.T. professionals or by applications. I.T. professionals, such as database
administrators, database developers, data analysts, and the like, access the database to program it,
administer it, or to more directly work with the data it contains through use of business intelligence
tools. Such people have more intimate access to the database and usually have a higher level of trust
within the organization. Everyone else gets access to the data indirectly through an application. The
application directly interacts with the database, and the end users use the application. Whether you
realize it or not, you regularly use applications that have a database backend, be they web‐based or
otherwise. For example, if you use Amazon.com, Ebay.com, and Student Link at Boston University, , you
are using a web application that has a database backend. You directly interact with the web application,
and the application interacts with the database.
Why does this matter to you? When you’re designing your database, you need to keep in mind who or
what will use the database and how it will be used. Will it be for personal use? For a club? For your place
of employment? For a mobile application? For an existing real‐world business (such as Amazon or Ebay)?
Only you can answer the who, what, and how for your database. A database is not designed in a
vacuum; rather, it is designed intentionally to support who or what will use it, and to support how it’s
expected to be used.
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What You Will Be Creating
Next, you need an idea of what you will be creating for this project, both in this and later iterations. An
outline is given below. Unless you have worked with relational databases previously, you will likely not
understand all of the terms used at this point. Do not worry. You will learn the terms as you need to
develop the items they relate to. Keep in mind that the iterations build on each other, so as you progress
through the iterations, you will first revise what you developed in prior iterations, then add additional
material. A similar outline is provided in every iteration to help you keep track of what you have
completed and will be completing.
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Current
Iteration Iteration 1
Project Direction Overview – You provide an overview that describes who the
database will be for, what kind of data it will contain, how you envision it will be
used, and most importantly, why you are interested in it.
Use Cases and Fields – You provide use cases that enumerate steps of how the
database will be typically used, also identify significant database fields needed to
support the use case.
Summary and Reflection – You concisely summarize your project and the work you
have completed thus far, and additionally record your questions, concerns, and
observations, so that you and your facilitator or instructor are aware of them and
can communicate about them.
Future
Iterations
Iteration 2
Structural Database Rules – You define structural database rules which formally
specify the entities, relationships, and constraints for your database design.
Conceptual Entity Relationship Diagram (ERD) – You create an initial ERD, the
universally accepted method of modeling and visualizing database designs, to
visualize the entities and relationships defined by the structural database rules.
Iteration 3
Specialization‐Generalization Relationships – You add one or more specialization‐
generalization relationships, which allows one entity to specialize an abstract entity,
to your structural database rules and ERD.
Initial DBMS Physical ERD – You create an initial DBMS physical ERD, which is tied to
a specific relational database vendor and version, with SQL‐based constraints and
datatypes.
Iteration 4
Full DBMS Physical ERD – You define the attributes for your database design and
add them to your DBMS Physical ERD.
Normalization – You normalize your DBMS physical ERD to reduce or eliminate data
redundancy.
Tables and Constraints – You create your tables and constraints in SQL.
Index Placement and Creation – To speed up performance, you identify columns
needing indexes for your database, then create them in SQL.
Iteration 5
Reusable, Transaction‐Oriented Store Procedures – You create and execute reusable
stored procedures that complete the steps of transactions necessary to add data to
your database.
History Table – You create a history table to track changes to values, and develop a
trigger to maintain it.
Questions and Queries – You define questions useful to the organization or
application that will use your database, then write queries to address the questions.
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Project Direction Overview
What kind of data should I capture? How should I choose a project direction? Where do I start? You may
have many questions like this, but the answer is simple. Choose something you’re interested in. The
exciting part is, you can create a database about whatever you’d like! You will be working with this data
a lot during the term, and we want you to enjoy it.
Once you’ve selected something of interest, you need to explain your choice so your facilitator or
instructor will know what you’re working toward. Create an overview in your design document which
describes who the database will be for, what kind of data it will contain, and how you envision it will be
used, and most importantly, why you are interested in it.
Since a database is not used in isolation, your project overview will likely have some references to non‐
database‐related areas such as application functionality or organizational processes. Such references are
just fine and expected, as long as they help you and your facilitator or instructor understand your
database. Just keep in mind that you will be focused on designing and implementing the database
component in this course.
To help guide you, I select my own project in an area of my interest, and give you examples in this and
all remaining term project iterations. Mine is only one project, so please do not let my choices limit your
creativity or project direction. My project is a database for a mobile application, but you may find that
your project is something drastically different than mine, which is expected. Further, you may create a
project that is much better than mine. Think of these examples as something that gives you a basic idea
of how to proceed, nothing more. First I provide an overview of my project.
TrackMyBuys Project Direction Overview
I would like to develop a mobile app which tracks all purchases someone makes, named
“TrackMyBuys”. When someone uses this app, they will have their full purchase history at their
disposal across all stores. Typically, when a person purchases something online, they can only see
their purchase history with that same vendor. If they purchase from 20 different stores, they need
to visit 20 different websites to see all of their purchase history. Further, there is no history they
can access for when they purchase in a brick‐and‐mortar store. People like to know what they
purchase and when for many reasons, including returns, buying or recommending a similar
product possibly many years after the original purchase, and even tracking down warranties when
something breaks. TrackMyBuys will store purchases made across all stores, making it the one stop
for any purchase history.
Here is are some brief examples of how someone would use the application. Aria makes many
online purchases. A couple weeks ago, she purchased a throwable camera from Amazon, and a
virtual reality headset from EBay. Using a browser extension, TrackMyBuys automatically recorded
each purchase. Aria also visited a nearby Old Navy store and purchased a sweater, which she then
manually recorded in the app. Today, her friend Brianna told her she really likes the throwable
camera as well as the sweater, and wants to buy them herself. Aria quickly looks up her purchases
in TrackMyBuys on her smartphone, then forwards the information onto Brianna. If Aria ever
needs to lookup her other purchases in the future, TrackMyBuys will be at her disposal, even as
many years pass by.
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While obviously there will be a significant programming component for TrackMyBuys, for this
course I am focusing on the database component. The database will store the names and locations
for the stores purchased from. It will record the details of each purchase such as the date and
price of the purchase. Since TrackMyBuys will be used by many people, the database will need to
associate the purchases with different accounts. Since I plan to charge for premium features, there
will need to be some kind of billing information. I’m sure there are details I’m not thinking of this
week, but these will become apparent in future weeks.
Notice that in the overview, I did not attempt to provide every detail, but rather provided a high‐level
summary. The details will be itemized in other sections of the design document.
Use Cases and Fields
For this component of your design document, you define use cases that enumerate steps of how the
database will be typically used. In software engineering, a use case is a list of steps defining interactions
between a person and the system. Uses cases are commonly used to help formally describe an
application. This effort will help you and your facilitator understand how a person or application
interacts with your database. The focus should be on how your database will be typically used.
For each use case, you also identify significant database fields needed to support the use case. This helps
you determine how the use case affects the database specifically, as opposed to how it affects the
general system or application. Give each field a reasonable name, explain what kind of data it stores,
and why such a field is needed to support the use case. Do not worry about discerning every last field;
this will be detailed in other sections of the design document. Here you are identifying the significant
fields that the database will clearly need to store to support the use cases.
Define at least three use cases for this iteration. Your design document will ultimately end up with more
than three; however, I do not want you to force creating more if three is all you can foresee at this point.
Oftentimes we envision additional use cases as we further define our database with more details, and
more use cases can be added in later iterations.
Here are some use cases and fields for TrackMyBuys.
TrackMyBuys Use Cases and Fields
One important usage of the database is when a person signs up for an account and installs the
application.
Account Signup/Installation Use Case
1. The person visits TrackMyBuys’ website or app store and installs the application.
2. The application asks them to create an account when its first run.
3. The user enters their information and the account is created in the database.
4. The application asks them to install browser plugins so that their purchases can be
automatically tracked when they make them.
From a database perspective, this use case requires storing information about accounts (from
steps #2 and #3). Steps #1 and #4 apply to the user and application but not the database directly.
Significant fields for an account for this application are listed in the table below.
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Field What it Stores Why it’s Needed
AccountName This field stores a summary
name associated with each
account,
In case the same person has more than
one account, they can select the correct
one from a dropdown list.
FirstName This is the first name of the
account holder.
This is necessary for displaying the
person’s name on screens and addressing
them when sending them emails or other
communications.
LastName This is the last name of the
account holder.
This is necessary for displaying the
person’s name on screens and addressing
them when sending them emails or other
communications.
CustomerSince This is the date the account
what was created.
This is useful for determining the age of
an account, which is useful for a variety of
reasons, such as giving discounts to long‐
term customers, customer retention, etc
…
AccountBalance This is the balance owed by
the customer.
This is useful to keep track of customers
that owe money to use the application.
Another important usage of the database is when an online purchase is made and automatically
recorded in TrackMyBuys via browser extensions.
Automatic Purchase Tracking Use Case
1. The person visits an online retailer and makes a purchase.
2. The TrackMyBuys browser plugin detects that the purchase is made, and records the relevant
information in the database such as the purchase date, price, product, store, etc.
Step #2 highlights that the database will store relevant information about an online purchase.
Significant fields are detailed below.
Field What it Stores Why it’s Needed
PurchaseDate This is the date of the
online purchase.
This is useful so that the person knows on
what day they made the purchase, and so
that they can search for purchases by
date.
PurchasePrice This is the total cost of the
purchase.
This is useful so that the person knows
how much money they spent on a
purchase, so they can search for
purchases by price.
Product This is the name of the
product that was
purchased.
This is necessary for so the person knows
what product they bought.
Store This is the name of the
store where the purchase
This is necessary so the person knows at
what store they made the purchase.
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took place.
URL This is the URL where the
purchase took place online.
This is useful so the person could go back
to the same online store and know what
website they were visiting when they
made the purchase.
Another important usage is when a person decides to lookup past purchases.
Purchase Lookup Use Case
1. The person signs into TrackMyBuys.
2. The person selects the option to lookup past purchases.
3. TrackMyBuys pulls a short list of recent purchases from the database, and also gives the user
the option to search.
4. The user searches based upon a date range, which causes a database search.
5. The application pulls all purchases matching the criteria from the database.
6. The user selects the purchase they are interested in.
7. TrackMyBuys displays all recorded information about the purchase.
8. At that point, the user can close out of the purchase, or share the purchase by selecting the
Share option.
The database would make use of the fields already highlighted for the second use case, Automatic
Purchase Tracking Use Case. This use case helps us understand more of how the user and
application would interact with the database, but does not appear to introduce additional
database fields beyond the second use case.
Notice that after reading through the use cases for TrackMyBuys, you have a better idea of how the
database will be used, how the application will interact with the database, and what data the database
will store.
Summary and Reflection
At this point, you and your facilitator or instructor have an idea of what kind of database you are
creating, which is great! To tie things together, concisely summarize your project and the work you have
completed in your design document. Your summary need not be long. Express briefly the main purpose
of your project and a few significant details, to tie together the ideas you have for your project.
Additionally, you may have some questions, concerns, and other observations. Take some time to write
these down in your design document, so that you and your facilitator or instructor are aware of them
and can communicate about them.
Here are is a summary of my TrackMyBuys project with some reflections.
TrackMyBuys Summary and Reflection
My database is for a mobile app named TrackMyBuys which records purchases made across all
stores, making it the one stop for any purchase history. Typically, when a person purchases
something, they can only see their purchase history with that same vendor, and TrackMyBuys
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seeks to provide a single interface for all purchases. The database must support a person entering,
searching, and even analyzing their purchases across all stores.
As I think about the use cases and fields defined in other sections of the design document, I
realized that TrackMyBuys may need to store all kinds of different data I did not originally
envision. For example, when I start down the path of billing people for using the application, there
might be a lot of information to store such as addresses to send bills to, payment and credit card
information, balances, payment history, and the like. I am a little daunted by the possible size and
complexity of the database, and may need some help focusing on the areas I can complete during
the course term.
This concern notwithstanding, I am excited to continue developing this project and hope to turn
TrackMyBuys application into a real, working mobile application. Any feedback on making this
better is appreciated.
Items to Submit
In summary, for this iteration, you create a database design document which contains the following
items.
Component Description
Project Direction Overview Provide an overview that describes who the database will be for,
what kind of data it will contain, how you envision it will be used,
and most importantly, why you are interested in it.
Use Cases and Fields Provide use cases that enumerate steps of how the database will
be typically used, also identify significant database fields needed
to support the use case.
Summary and Reflection Create a concise summary of your project and the work you have
completed thus far, and additionally record your questions,
concerns, and observations, so that you and your facilitator or
instructor are aware of them and can communicate about them.
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Evaluation
Your iteration will be reviewed by your facilitator or instructor with the following criteria and grade
breakdown.
Use the Ask the Facilitators Discussion Forum if you have any questions
regarding how to approach this iteration. Make sure to include your name in the
filename and submit it in the Assignments section of the course.
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