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POTrying to define a model class on top of PDO and failing big time
 

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  1. POTrying to define a model class on top of PDO and failing big time
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    <p>I'm trying to build a small, seemingly simple app in pure php (can't use any framework or fancy tools such as orms).</p> <p>I got started by defining object representing my models. My idea is to have a <code>Model</code> base class, which would hold a static pdo instance to access the database, and two "concrete" model classes inheriting from it and implementing the custom method they'll need.</p> <p>Well, boy am i rusty in PHP. It's also the first time i'm doing actual oop with it (i've done enough of it in other languages (C# and python, mainly) to understand how it's supposed to work, but some subtleties might very well elude me.</p> <p>If anyone cares to help, here's what i have so far:</p> <pre><code>&lt;?php /** * Base model class, handling basic db connection */ Class Model { protected static $db; public static function initDb() { self::$db = new PDO(DB_CONNECTION_STRING, DB_USER, DB_PSWD); } protected function _prepare_request($sqlstmnt) { return self::$db-&gt;prepare($sqlstmnt); } } Model::initDb(); /** * Model class for Category objects **/ Class Categorie extends Model { private $request_getSingle = NULL; public function __contruct() { $this-&gt;request_getSingle = $this-&gt;_prepare_request( "SELECT * FROM categorie WHERE cat_id = :id;" ); } public function getById($id) { $poop = $this-&gt;request_getSingle-&gt;execute(array(':id' =&gt; $id)); $res = $poop-&gt;fecthAll(); print_r($res); } } // Debug tests: $c = new Categorie(); var_dump($c); $c-&gt;getById('1'); print_r($c); echo 'done'; ?&gt; </code></pre> <p>Seems like my query objects are not initialized properly - Here's what i get when i run that silly debug code:</p> <pre><code>object(Categorie)#3 (1) { ["request_getSingle":"Categorie":private]=&gt; NULL } Fatal error: Call to a member function execute() on a non-object in /home/raphi/dev/naoned-test/models/categories.php on line 18 Call Stack: 0.0003 648192 1. {main}() /home/raphi/dev/naoned-test/models/categories.php:0 0.0011 661784 2. Categorie-&gt;getById() /home/raphi/dev/naoned-test/models/categories.php:27 </code></pre> <p>I have NO idea what exactly is going wrong. I might be using static variables wrong, or miss something about how PDO works.</p> <p>Hope that's clear enough, and thank to anyone willing to help (there might be somme silly errors here and there caused by helpless hacking around).</p> <p><strong>EDIT:</strong> After hacking around, turns out that if i call the PDO prepare, execute, etc... methods within <code>getById</code>, everything works fine. But why can't i keep the prepared SQL statement as an instance variable ? Having to call <code>prepare</code> each time i want to access it seems to defeat its purpose...</p> <p><strong>EDIT:</strong> Well... This seems fixed, but i still don't understand. I've replaced my <code>request_getSingle</code> variable by an array, which contains several prepared statements (which is what i planned to do eventually anyway...) and everything works fine.</p> <p>I don't get it. If i store them in an array, they can be accessed from the class's other methods, but if i store them as regular attributes, they can't ?</p> <p>If anyone has some idea of what's going on, i'm still interested... </p>
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