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-<com:TContent ID="body">

-<h1>Create Business Code</h1>

-<p>We start the design with the database, the entity relationships are shown

-in the diagram below.</p>

-

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

-

-<p>Now we can begin to create and test some business code. Let us begin

-with the <tt>Project</tt> defintions. First, we add some properties or fields.</p>

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

-&lt;?php

-class Project

-{

-	 public $ActualDuration = 0;

-	 public $CreatorUserName = '';

-	 public $CompletionDate = 0;

-	 public $DateCreated = 0;

-	 public $Description = '';

-	 public $EstimateDuration = 0;

-	 public $ID = 0;

-	 public $ManagerUserName = '';

-	 public $Name = '';

-}

-?&gt;

-</com:TTextHighlighter>

-

-<p>All the fields should be self explainatory. The <tt>ManagerUserName</tt>

-is the user name of the project manager. Notice that the fields

-are public, later on, we can change some or all of them to be private and

-provide some accessor and mutators (i.e. getters and setters). If we want

-we can let the <tt>Project</tt> class inherit <tt>TComponent</tt> such

-that the getters and setters can be used like properties, such as those

-found in Prado.</p>

-

-<h2>Business Services, test case first</h2>

-<p>Next we want to add users to the project. For this, we start with some

-unit tests. We are going to design the business logic around the concept of 

-<a href="java">Data Access Objects</a> (DAO).</p> 

-

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

-&lt;?php

-Prado::using('Application.APP_CODE.*');

-class ProjectDaoTestCase extends UnitTestCase

-{

-	function testProjectDaoCanCreateNewProject()

-	{

-		$project = new Project();

-		$project->Name = "Project 1";

-		

-		$dao = new ProjectDao();

-		

-		$this->assertTrue($dao->createNewProject($project));

-		$this->assertEqual($dao->getProjectByID(1), $project);

-	}

-}

-?&gt;

-</com:TTextHighlighter>

-<p>So what are we doing here? First we create a new <tt>Project</tt> named

-"Project 1". Then we create a new <tt>ProjectDao</tt> so we can insert new projects

-and retrieve it. We assert that a project will be create sucessfully using

-<tt>assertTrue($do->createNewProject(...))</tt>. We also assert that

-<tt>getProjectByID(1)</tt> will return an instance of <tt>Project</tt> class

-with same data (the reference may be different).</p>

-

-<p>If we run the above unit test case, nothing is going to pass since we have

-not even defined the <tt>ProjectDao</tt> class. So lets do that first and import

-the class in the tests as well.</p>

-

-<p>We will create a base Dao class as follows, and we save as <tt>BaseDao.php</tt>

-in our <tt>APP_CODE</tt> directory.</p>

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

-&lt;?php

-class BaseDao

-{

-	private $_connection;

-	

-	public function setConnection($connection)

-	{

-		$this->_connection = $connection;

-	}

-	

-	protected function getConnection()

-	{

-		return $this->_connection;

-	}

-}

-?&gt;

-</com:TTextHighlighter>

-<p>And finally our <tt>ProjectDao</tt> class.</p>

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

-&lt;?php

-Prado::using('Application.APP_CODE.BaseDao');

-class ProjectDao extends BaseDao

-{

-}

-?&gt;

-</com:TTextHighlighter>

-<p>If we run the unit test again, we get an error message something like

-"<i>Fatal error: Call to undefined method ProjectDao::createNewProject() in ...</i>".

-So let us, fix this.

-</p>

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

-class ProjectDao extends BaseDao

-{

-	public function createNewProject($project)

-	{		

-	} 

-	

-	public function getProjectByID($projectID)

-	{	

-	}

-}

-</com:TTextHighlighter>

-<p>Run the unit test again, we see a different type of error now. This time

-the unit test runner complians that the test fails.</p>

-<h2>Write Test, Run Test, Repeat</h2>

-<div class="info">

-<b>At this point, you may notice a repetition</b>

-<ol>

-	<li>write some test code,</li>

-	<li>run the test, test gives an error,</li>

-	<li>write some actual code to only remove the previous error,</li>

-	<li>goto step 1 to repeat.</li>

-</ol>

-</div>

-<p>We shall see how we can make this test pass in the next section.</p>

-</com:TContent>
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