How to solve the problem in Teacher George's code when calling IP list from database?

This article explores how to improve a piece of code so that it can correctly handle the list of IP addresses extracted from the database. The original code has problems with handling IP addresses in different formats in the database.

The original code snippet is as follows:

 ' ... (some code omitted) ...
iplist = array(""&rs("ip")&"")
' ... (rest of the code omitted) ...

This code tries to convert the database field rs("ip") directly into an array, but this fails when the database IP address format is "99.88", "110.52", "43.80.235", "11.9.67.180" or 99.88, 110.52, 43.80.235, 11.9.67.180.

The improved code is as follows:

 ' ... (some code omitted) ...
Dim ipString, ipArray
ipString = rs("ip")
ipArray = Split(ipString, ",") ' Use commas to split IP address string For each ip In ipArray
    ip = Trim(ip) ' Remove the front and back spaces If userIP = ip Then
        found = True
        Exit For
    End If
Next

If found Then
    Response.Write "ok"
    Response.End
End If
%>

The improved code first assigns the database field rs("ip") to the ipString variable. Then, use the Split function to split ipString into an IP address array ipArray with the comma (,) delimiter. Finally, the code traverses each IP address in ipArray , uses Trim function to remove the front and back spaces, and then performs IP address matching. This solves the problem that the original code cannot correctly handle lists of IP addresses in different formats, ensuring the robustness of the code.

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