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MySQLi - num_rows - ->query usage
class sql extends mysqli {
    public function __construct($data = array()) {
        parent::__construct($dbhost, $dbuser, $dbpass, $dbname);
        $this->set_charset("utf8");
    }
   function get($sql) {
        $res = self::query($sql)
                or trigger_error("Prepared Select Statement Error: " . $this->error . "n");

        return $res;
    }
}

$sql = new sql();
$result = $sql->get('select * from `session` LIMIT 1');
$num = $result->num_rows;
if($num === 1)
    // update statement
else
   //  insert new row.

while($array = $result->fetch_assoc())
{
    // parse data
}