In addition to fokat's remarks on not disconnecting, I see some other problems.

• Don't quote the table and column names. You appear to be using backticks on them.
• Your undef value for the second argument of $dbh->do should instead be an empty hash reference. Replace 'undef' with {}.

Update: Ok, time for some debug-fu. If you are not already doing so, open the DBI connection with the {RaiseError=>1} attribute. That will cause your program to die with an error message whenever MySQL access causes an error. Scatter some print statements inside your conditionals to mark what code is reached.

After Compline,
Zaxo

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