简单的mysql操作类

<?php
final class MySQL {
    private $connection;
    
    public function __construct($hostname, $username, $password, $database) {
        if (!$this->connection = mysql_connect($hostname, $username, $password)) {
      exit('Error: Could not make a database connection using ' . $username . '@' . $hostname);
    }
 
    if (!mysql_select_db($database, $this->connection)) {
      exit('Error: Could not connect to database ' . $database);
    }
        
        mysql_query("SET NAMES 'utf8'", $this->connection);
        mysql_query("SET CHARACTER SET utf8", $this->connection);
        mysql_query("SET CHARACTER_SET_CONNECTION=utf8", $this->connection);
        mysql_query("SET SQL_MODE = ''", $this->connection);
  }
        
  public function query($sql) {
        $resource = mysql_query($sql, $this->connection);
 
        if ($resource) {
            if (is_resource($resource)) {
                
                $i = 0; $data = array();    
                while ($result = mysql_fetch_assoc($resource)) {
                    $data[$i] = $result;     
                    $i++;
                }
                
                mysql_free_result($resource);
                
                $query = new stdClass();
                $query->row = isset($data[0]) ? $data[0] : array();
                $query->rows = $data;
                $query->num_rows = $i;
                
                unset($data);
                return $query;    
                
        } else {
                return TRUE;
            }
        } else {
      exit('Error: ' . mysql_error($this->connection) . '<br />Error No: ' . mysql_errno($this->connection) . '<br />' . $sql);
    }
  }
    
    public function escape($value) {
        return mysql_real_escape_string($value, $this->connection);
    }
    
    public function countAffected() {
        return mysql_affected_rows($this->connection);
    }
 
    public function getLastId() {
        return mysql_insert_id($this->connection);
    }    
    
    public function __destruct() {
        mysql_close($this->connection);
    }
}
?>