Database class

<?php
/* Database Class */
class database {
	/* Set Private Database info so only this class can connect to it */
	private $hostname;
	private $database;
	private $username;
	private $password;
	/* Other Variables */
	private $pdo;
	/* Auto Load Database */
	function __construct($hostname, $database, $username, $password) {
		/* Set Private Database values */
		$this->hostname = $hostname;
		$this->port     = 3306;
		$this->database = $database;
		$this->username = $username;
		$this->password = $password;
		/* Try to connect else catch the failure */
		try {
			$this->pdo = new PDO("mysql:host={$this->hostname};port={$this->port};dbname={$this->database}", $this->username, $this->password, array(PDO::ATTR_PERSISTENT => true));
		} catch(PDOException $e) {
			print "<b>Error - Connection Failed: </b>" . $e->getMessage() . "<br/>";
			die();
		}
	}
	/* Build Query based on $query variable */
	/* Example of Bind array(":id" => "1", ":soemthing" => "The value") */
	public function query($query, $bind = null) {
		global $pdo;
		$this->pdo->beginTransaction();
		/* Prepare Statment */
		$this->statement = $this->pdo->prepare($query);
		/* Execute Query */
		$this->statement->execute($bind);
		$this->pdo->commit();
		$this->insertid = $this->pdo->lastInsertId();

	}
	/* Return row Count */
	public function count() {
		/* Return Count */
		$result = $this->statement->rowCount();
		return $result;
	}
	/* return last id of paste */
	public function lastid() {
		$result	= $this->pdo->lastInsertId();
		return $result;
	}
}