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my $hostmatch;
while( $row = $sth->fetchrow_hashref ) {
...
        $hostmatch = 1;
    }
}

if( param('select') and param('select') !~ /\.\./ )
{
    my $data = ...
    ...
}

my $data;
if( param('select') and param('select') !~ /\.\./ )
...
    $data = ...
    ...
}