ขอสอบถามปัญหา php กับ while ใน ฐานข้อมูลหน่อยครับ

echo $sql1 = "select * from check_login where userid = '177'";
		$query = mysql_query($sql1);
		$j = 0;
		while($rs = mysql_fetch_array($query))
		{
			echo $DBip = $rs["ip_login"];
			echo $DBtime = $rs['time_login'];
		
		$j++;
}

echo $sql1 = "select * from check_login where userid = '$DBid'";
		$query = mysql_query($sql1);
		$num_rows = 0;
		if($num_rows < 1)
	{
		$j = 0;
		while($j<$num_rows)
		{
			$rs = mysql_fetch_array($query)
			echo $DBip = $rs["ip_login"];
			echo $DBtime = $rs['time_login'];
		
		$j++;
		}
	}