You need to quote non-numeric values when using SQL that way. Better would be to use placeholders:

my $sth =
$dbh->prepare("insert into t_table (id, folder, webpage) values (?,?,?
+)");
$sth->execute($id, $folder, $webpage);
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Update:Oops. /me notices you are using Win32::ODBC. Ignore the above code then, unless you switch to DBI. You still need to put quotes around any non-numeric values though...