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-<com:TContent ID="body">

-<h1>Database Design</h1>

-<p>The design steps we take in the sample application is a data centric

-approach. That is, we shall consider the application from the view

-point of data structures, data relationships and data integrity.

-Other designs starting from object and class design are also possible but is

-not the approach taken in this guide.

-</p>

-

-<h2>Entity Relationship</h2>

-<p>We start with the following entity relationship diagram. 

-The bold text in each entity indicate required fields. The underline

-text indicates the entity's primary key, also denoted as <tt>PK</tt>.

-Entity relationships are indicated with arrows between entities and

-each relationship field is denoted with <tt>FK</tt>.</p>  

-

-<p>The four entities: <tt>Project</tt>, <tt>Categories</tt>, <tt>TimeEntry</tt> 

-and <tt>ProjectMembers</tt>

-makes up the time tracker application. While the other entities:

-<tt>Users</tt>, <tt>UserRoles</tt>, <tt>RoleTypes</tt> and <tt>Signon</tt> are

-usually found in applications where membership or user management is required.</p> 

-

-<img src=<%~ db.png %> class="figure" />

-</p>

-

-<div class="info"><b>Info:</b>

-See <a href="http://en.wikipedia.org/wiki/Database_normalization">Database Normalization</a>

-for a quick reference regarding database design and normalization, especially the

-3rd normal form (3NF).

-</div>

-

-<h2>MySQL database</h2>

-<p>We shall concentrate on the MySQL database for this sample application.

-Other database engines are also possible and can be quite easily inter-changed.

-The SQL script to initialize the MySQL database is given below. The following

-SQL script was created using MySQL version 4.1.7. 

-</p>

-

-<com:TTextHighlighter Language="sql" CssClass="source">

-<%= file_get_contents('protected/data/time-tracker-mysql.sql') %>

-</com:TTextHighlighter>

-</com:TContent>
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