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POPHP Class Database interaction (using PDO)
 

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    <p>Hey guys, so I'm completely new to Object Oriented PHP -- I've read some tutorials, but I can't find anything that really goes into working with a database with PHP classes.</p> <p>I'm trying to make something simple -- a quick news post class. You get the post from the database, etc. However, I'm getting an error whenever I try to interact with the database.</p> <p>I read that PDO is the way to go with OO PHP; to that end, I've developed a database class, as detailed in this post: <a href="https://stackoverflow.com/questions/2047264/use-of-pdo-in-classes">Use of PDO in classes</a></p> <pre><code>class Database { public $db; // handle of the db connexion private static $dsn = "mysql:host=localhost;dbname=test"; private static $user = "admin"; private static $pass = "root"; private static $instance; public function __construct () { $this-&gt;db = new PDO(self::$dsn,self::$user,self::$pass); } public static function getInstance() { if(!isset(self::$instance)) { $object= __CLASS__; self::$instance=new $object; } return self::$instance; } // others global functions } </code></pre> <p>I then attempt to use it in my PHP class, in order to retrieve data on a news post:</p> <pre><code>&lt;?php require_once "database.php"; class news extends Database { private $title; private $author; private $date; private $content; private $category; function __construct($id) { $db = Database::getInstance(); $query = $this-&gt;db-&gt;prepare("SELECT title, author, date, content, category FROM news WHERE id = :id LIMIT 1"); $query-&gt;bindParam(":id", $this-&gt;id, PDO::PARAM_INT); if ($query-&gt;execute()) { $result = $query-&gt;fetch(PDO::FETCH_OBJ); $this-&gt;set_title($result-&gt;title); $this-&gt;set_author($result-&gt;author); $this-&gt;set_date($result-&gt;date); $this-&gt;set_content($result-&gt;content); $this-&gt;set_category($result-&gt;category); } } &lt;...&gt; ?&gt; </code></pre> <p>Every time I try to run this script though, I get the following error:</p> <p>Fatal error: Call to a member function prepare() on a non-object in /news.class.php on line 16</p> <p>Any ideas?</p>
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    1. COSide note: if you want to implement the Database class as a singleton (i.e. xx::getInstance()), leave __construct() blank or even make it private so that getInstance() is the only way to access it. Otherwise it's just a regular class with funny instantiation.
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