Starting OOP, DB Class Feedback

[Vbabiy]

Hey guys i started to write DB class and though i could maybe get some feedback on it so far.

Remember its still in the works...

<?php
//DB Classes
abstract class DB 
{
	protected abstract function connect();
	public abstract function query($query);
	public abstract function close();
	public abstract function selectDB();
}

class Mysql_DB extends DB 
{
	private $host;
	private $user;
	private $pass;
	private $db;

private $dbcx;

private $error = array();

public function __construct($host,$user,$pass,$db)
{
	$this->host = $host;
	$this->user = $user;
	$this->pass = $pass;
	$this->db = $db;

	$this->connect();
}
	protected function connect()
{
	$connect = @mysql_connect($this->host,$this->user,$this->pass);
	if (!$connect) 
	{
		$this->error['Connection'] = 'Connection could not be made at host: '.$this->host.' --- MYSQL ERROR: '.mysql_error($this->dbcx);
		return false;
	} else {
		$this->dbcx = $connect;
		if ($this->selectDB())
		{
			return true;
		}
	}
}
public function selectDB()
{
	$select = @mysql_select_db($this->db,$this->dbcx);
	if (!$select) 
	{
		$this->error['Database'] = 'Database '.$this->db.' doesnt exist --- MYSQL ERROR: '.mysql_error($this->dbcx);
		return false;
	} else {
		return true;
	}
}	
public function query($query)
{
	if (!$result = @mysql_query($query,$this->dbcx)) 
	{
		$this->error['Query'] = 'Error with Query:\''.$query.'\' --- MYSQL ERROR: '.mysql_error($this->dbcx);
		return false;
	} else {
		return $result;				
	}		
}	
public function affectedRows()
{
	return mysql_affected_rows($this->dbcx);
}	
public function characterSet()
{
	return mysql_client_encoding($this->dbcx);
}	

public function dataSeek($row)
{
	if (@mysql_data_seek($this->dbcx,$row)) 
	{
		return true;
	} else {
		$this->error['DataSeek'] = 'Failure moving pointer to row '.$row.' --- MYSQL ERROR: '.mysql_error($this->dbcx);
		return false;
	}
}
public function setResultType($type)
{
	$this->Result_Type = $type;
}
public function fetchArray($results,$result_type = 'ASSOC')
{
	switch ($result_type)
	{
		case 'ASSOC':
			$result_type = MYSQL_ASSOC;
			break;
		case 'NUM':
			$result_type = MYSQL_NUM;
			break;
		case 'BOTH':
			$result_type = MYSQL_BOTH;
			break;
		default:
			$result_type = MYSQL_ASSOC;
			break;
	}

	$returnArray =@mysql_fetch_array($results,$result_type);
	if ($returnArray) 
	{
		return $returnArray;
	} else {
		$this->error['FetchArray'] = 'Unable to fetch array --- MYSQL ERROR: '.mysql_error($this->dbcx);
		return false;
	}
}
public function close()
{
	if (@mysql_close($this->dbcx)) 
	{
		return true;
	} else {
		$this->error['Close DB'] = $this->host.'Failed to close --- MYSQL ERROR:'.mysql_error($this->dbcx);
		return false;
	}
}
public function isError()
{
	if (empty($this->error)) 
	{
		return false;
	} else {
		return true;
	}
}
public function getError()
{
	$errors ='';
	foreach ($this->error as $cause => $error) 
	{
		$errors .= $cause.' ~~ '.$error.'<br />';
	}
	return $errors;
}
public function __destruct()
{
	$this->close();
}
}
?>