<?php

	class MySQL
	{
		protected $dsn;

		protected $host;

		protected $username;
		protected $password;

		protected $database;

		public $link;

		public function __construct($host = '', $username = '', $password = '', $database = '')
		{
			if ( ! empty($host))
			{
				$this->setHost($host);
			}

			if ( ! empty($username))
			{
				$this->setUsername($username);
			}

			if ( ! empty($password))
			{
				$this->setPassword($password);
			}

			if ( ! empty($database))
			{
				$this->setDatabase($database);
			}
		}

		public function getConnectionString()
		{
			return $this->dsn;
		}

		public function setConnectionString($dsn)
		{
			$this->dsn = $dsn;

			return $this;
		}

		public function getHost()
		{
			return $this->host;
		}

		public function setHost($host)
		{
			$this->host = $host;

			return $this;
		}

		public function getUsername()
		{
			return $this->username;
		}

		public function setUsername($username)
		{
			$this->username = $username;

			return $this;
		}

		public function getPassword()
		{
			return $this->password;
		}

		public function setPassword($password)
		{
			$this->password = $password;

			return $this;
		}

		public function getDatabase()
		{
			return $this->password;
		}

		public function setDatabase($database)
		{
			$this->database = $database;

			return $this;
		}

		public function getAttribute($attribute)
		{
			if ( ! is_null($this->link))
			{
				return $this->link->getAttribute($attribute);
			}

			return false;
		}

		public function setAttribute($attribute, $value)
		{
			if ( ! is_null($this->link))
			{
				$this->link->setAttribute($attribute, $value);

				return $this;
			}

			return false;
		}

		public function connect()
		{
			if ($this->link instanceof PDO)
			{
				return $this;
			}

			if (empty($host) || empty($username) || empty($database))
			{
				return false;
			}

			$this->setConnectionString(sprintf('mysql:host=%s;dbname=%s', $this->getHost(), $this->getDatabase()));

			try
			{
				$this->link = new PDO($this->getConnectionString(), $this->getUsername(), $this->getPassword());

				$this->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
			}
			catch (PDOException $e)
			{
				throw new RuntimeException($e->getMessage());
			}

			return $this;
		}
	}