db_mysql::error PHP Method

    public function error($errno = 0, $errstr = '')
    {
        $this->errno = $errno ? $errno : ($this->link ? mysql_errno($this->link) : mysql_errno());
        $this->errstr = $errstr ? $errstr : ($this->link ? mysql_error($this->link) : mysql_error());
        DEBUG and trigger_error('Database Error:' . $this->errstr);
    }