PHP: PDO Wrapper

pdo.class.php

<?php
/**
 * PDO Wrapper Class
 *  @author Christopher A. Moore <[email protected]>
 *
 * @refs :
 *   http://net.tutsplus.com/tutorials/php/why-you-should-be-using-phps-pdo-for-database-access/
 *  @test
 */

class PdoWrapper {

	private $dbh;
	public $sql;

	/**
	 * Setup the Object
	 *  I know db creds are hard coded for now
	 */
	function __construct() {
		$this->dbh = new PDO( "mysql:host=localhost;dbname=dbname", 'root', 'root' );
		$this->dbh->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
	}

	/**
	 * Straight Queries / Preparin Staements
	 */
	function call() {
		try {
			$this->sth = $this->dbh->prepare( $this->sql );
			$this->sth = $this->dbh->query( $this->sql );
			$this->sth->setFetchMode( PDO::FETCH_ASSOC );
			while ( $row = $this->sth->fetch() ) {
				$data[] = $row;
			}
			return json_encode( $data[0] );
		}
		catch( PDOException $e ) {
			echo $e->getMessage();
		}
	}

}
$pdo = new PdoWrapper();
//new Orders Today
$pdo->sql = $sql['title'];
$data = $pdo->call();