Some things I found...

1. This doesn't compile as you have NOT declared any of your variables.

2. You are using $CONTROL = $data[2] when you do the split but in your $sth statement you try to select where  control = $Control $CONTROL does NOT equal $Control.

3. Your logic seems a little confusing, you are saying in the unless($matches) { that if you get no matches you will then update. That seems backwards what can you update if you get NO match and if you DO get a match you will then insert..?

4. As Enlil says you disconnect before you run the do

Some good node can be found here at the Monastery talking about SQL queries etc here are a few I found interesting

• Problem with code - This one looks similar to yours
• Re: What are placeholders in DBI, and why would I want to use them?
• DBI Placeholders

Added: You also might like to change

if (-e  "v:/tf_out.txt")
{
      }
 else
 {
       die "File does not exist\n";
     }
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unless (-e "v:/tf_out.txt") { die "File does not exist\n"; }
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