my $error_sth = $error_db->prepare("SELECT Error_list from error_potra
+it WHERE Date='$date' and Type='$type'");
$error_sth->execute() or die $DBI::errstr;
Don't use dynamic SQL! :) That is, don't stick variables directly in your statements. Use placeholders for security. It's really easy too. Something like:
my $error_sth = $error_db->prepare("SELECT Error_list from error_potra
+it WHERE Date=? and Type=?");
$error_sth->execute($date, $type) or die $DBI::errstr;
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