PHP OOP - Mysql

<?php

/**
* @author     Andre Liebich <[email protected]>
* @copyright  2013 Browserforge
* @link       http://www.browserforge.com
*/

class Mysql
{

    private $host;
    private $username;
    private $password;
    private $database;

    /**
    * Create the Variable
    */

    function __construct()
    {
        $this -> host = "localhost"; // The Mysql-Host
        $this -> username = "localhost"; // The Username from Database
        $this -> password = "example"; // The Password from Database
        $this -> database = "test"; // Databasename
        Mysql::dbconnect();
    }

    /**
    * Create connection to Database
    */

    public function dbconnect()
    {
        $connection = mysql_connect($this->host, $this->username, $this->password) or die ("Account not found");
        mysql_select_db($this->database, $connection) or die ("Database not found.");
    }

    /**
    * Return the result of the Query like ("INSERT INTO `example`....")
    */

    public function query($query)
    {
        $query = mysql_query($query) or die (mysql_error());
        return $query;
    }

    /**
    * Return the result of the Query like ("SELECT * FROM `example` WHERE ......")
    */

    public function obj($query)
    {
        $query = mysql_fetch_object(mysql_query($query)) or die (mysql_error());
        return $query;
    }

    /**
    * Return a number of all results.
    */

    public function rows($query)
    {
        $query = mysql_num_rows(mysql_query($query)) or die (mysql_error());
        return $query;
    }

    /**
    * Returns an associative array with the field names as keys back
    */

    public function assoc($query)
    {
        $query = mysql_fetch_assoc(mysql_query($query)) or die (mysql_error());
        return $query;
    }

    /**
    * Return all results in a array
    */

    public function arry($query)
    {
        $query = mysql_fetch_array(mysql_query($query)) or die or die (mysql_error());
        return $query;
    }

    /**
    * Checks if a table exists
    * @param $table The Name of the Table
    */

    function table_exists($table)
    {
        if(mysql_query("SELECT * FROM `$table`")){
            return true;
        }else{
            return false;
        }
    }

}

?>