<?php
class Repository
{
	private static $link;

	private $map;
	private $updated;

	public static function getInstance()
	{
		self::$link=mysql_connect('localhost','xxxxxx','xxxxxx');
		mysql_select_db('test');

		$result=mysql_query("select data from serialized_data");
		$row=mysql_fetch_row($result);
		$data=$row[0];
		if($data)
			$repository=unserialize($data);
		else
			$repository=new Repository();

		return $repository;
	}

	private function __construct()
	{
		$this->map=array();
		$this->updated=false;
	}

	public function set($key,$val)
	{
		$this->map[$key]=$val;
		$this->updated=true;
	}

	public function get($key)
	{
		return $this->map[$key];
	}

	public function __destruct()
	{
		if($this->updated)
		{
			$this->updated=false;
			mysql_query("update serialized_data set data='".(serialize($this)."'"));
		}
		mysql_close(self::$link);
	}
}
?>