Project Galaxy EW - DATABASE

<?php

class Database
{
    protected $_database = null;
    private static $_instance = null;
    const DEFAULT_SQL_HOSTNAME = "localhost";
    const DEFAULT_SQL_DBNAME = "expedition-wars";
    const DEFAULT_SQL_USERNAME = "root";
    const DEFAULT_SQL_PASSWORD = "";

    public function __construct()
    {
        try
        {
            $this->_database = new PDO("mysql:host=".self::DEFAULT_SQL_HOSTNAME.";dbname=".self::DEFAULT_SQL_DBNAME, self::DEFAULT_SQL_USERNAME, self::DEFAULT_SQL_PASSWORD);
            $this->_database->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        }
        catch(Exception $error)
        {
            throw new Exception($error->getMessage());
        }
    }

    public static function GetInstance()
    {
        if(is_null(self::$_instance))
        {
            self::$_instance = new Database();
        }
        return self::$_instance;
    }
}

?>