Can't put IP-address in database

I'm trying to put an ip-address in my database. If I do an echo like this:

echo $_SERVER['REMOTE_ADDR'];

But if I'm trying to put it in a variable or in the database it gives nothing, so in my database it says: NULL The commands I used for that:

$ip = $_SERVER['REMOTE_ADDR'];
mysql_qu开发者_如何学Goery("UPDATE users SET last_ip='".$ip."' WHERE id=".$row['id']) or die(mysql_error());

I don't know what I'm doing wrong. Can someone help me with this please?

Thanks!

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You will want to make your last_ip column an int(10) unsigned and then change your UPDATE to be:

$SQL = "UPDATE users 
        SET last_ip = INET_ATON('$ip')
        WHERE id='{$row['id']}'";

Then when selecting you would use:

$SQL = "SELECT INET_NTOA(last_ip) AS last_ip 
        FROM users";

This converts the IP address into an integer for efficient storage. For more information please see the MySQL manual pages for INET_ATON() and INET_NTOA().

Otherwise if you want it to be stored as text rather than in the most efficient way you can set your last_ip column to be char(16) and continue to use the UPDATE query you posted in your question.

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Your code is correct and should work. Unless as commented by @wallyk, the data type of the ip field is unsupported one.

However, just to make sure wrap the WHERE condition in ' (Single Quote) and try.