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POPHP mySQL constructing parent data from child class
 

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    <p>I have a database with 3 tables. <code>person</code>, <code>player</code>, and <code>coach</code>. The <code>person</code> table contains things that the <code>player</code> and <code>coach</code> have in common, such as <code>firstName</code>, <code>lastName</code>, and <code>email</code>. The <code>player</code>, and <code>coach</code> tables then have a link back to the <code>person</code> table with a <code>personId</code> field. Every person who accesses the site has a <code>person</code> entry. Additionally, some users may also have <code>player</code> or <code>coach</code> entries. The database is set up this way to maintain normalization.</p> <p>In my code, I have a <code>person</code>, <code>player</code>, and <code>coach</code> class. The <code>player</code> and <code>coach</code> inherit from <code>person</code>. Below is a truncated version of the <code>person</code> and <code>player</code> classes.</p> <pre><code>class person{ private $firstName; private $lastName; public function __construct($firstName, $lastName){ $this-&gt;firstName = $firstName; $this-&gt;lastName = $lastName; } } class player extends person{ private $position; private $jersey; public function __construct($firstName, $lastName, $position, $jersey){ parent::__construct($firstName, $lastName); $this-&gt;position = $position; $this-&gt;jersey = $jersey; } } </code></pre> <p>As a heads up I'm quite new to OOP so bear with me if there's things I don't know.</p> <p>(side question, what are the above classes considered, Views?)</p> <p>Now in order to populate these I use what I understand to be the Model classes (is that right?).</p> <pre><code>class personModel{ public function getPerson($personId){ $sql = "SELECT * FROM `person` WHERE `personId` = '$personId'"; //skipping some sql stuff in here return new person($sql['firstName'], $sql['lastName']); } } </code></pre> <p>But now the heart of my question, is how do I implement a <code>playerModel</code>?</p> <pre><code>class playerModel{ public function getPlayer($playerId){ //would I do a join SQL here? //or would I call personModel::getPerson() //or do both these options couple the two classes too tightly? } } </code></pre> <p>Would some kind of <code>factory</code> class be another option? If so, how would that be done?</p> <p>I need to be able to construct <code>person</code>, <code>player</code>, and <code>coach</code> objects, because I have users that will fall into all those categories.</p> <p>Any feedback is greatly appreciated, and I'll be checking back often if I need to clarify anything.</p>
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