Hi, your code looks good. Its working fine for me with hyperlink. In DBIx::XHTML_Table module, all the column names are in same case (lower or upper) as of database field name.

Look the code:

use DBIx::XHTML_Table;

# database credentials - fill in the blanks
my ($data_source,$usr,$pass) = ();

my $table = DBIx::XHTML_Table->new('DBI:mysql:project', '', '');

$table->exec_query("select * from test");

$table->modify(table => {
     width  => '100%',
     cellspacing=> '2',
     cellpadding=>'5',
    'border-style' => 'inset',
    'border-width' => 'thin',
  });

$table->modify(th => {
  style => {
    color      => '#FFFAF0',
    background => '#4682B4',
    'text-align' => 'center',
    'text-transform'=> 'uppercase',
  }
},'head');

$table->modify(tr => {
  style => {
    background => ['#B0C4DE','#F0F8FF'],
  }
});


$table->modify(td => {
    style => {
    'text-align' => 'left',
    'white-space' => 'nowrap',
    }
  });
$table->modify(td => {
    style => {
    'text-align' => 'center',
    'white-space' => 'nowrap',
    }
  },['id']);

$table->modify(th => {
   style => 'background: #FFF0F5'
},'id');

$table->map_cell( sub{
            my $datum = shift;
           return qq|<a href="http://sctesrv.india/cgi/project/viewpro
+jectdetail.cgi?projectid=P-$datum">"$datum"</a>|;
           }, ['id']);

print $table->output;
[download]

Output as:
<table width="100%" cellspacing="2" cellpadding="5" border-width="thin
+" border-style="inset">
    <thead>
    <tr style="background: #B0C4DE;">
        <th style="background: #FFF0F5">Id</th>
        <th style="text-align: center; text-transform: uppercase; colo
+r: #FFFAF0; background: #4682B4;">Value</th>
    </tr>
    </thead>
    <tbody>
    <tr style="background: #F0F8FF;">
        <td style="text-align: center; white-space: nowrap;"><a href="
+http://sctesrv.india/cgi/project/viewprojectdetail.cgi?projectid=P-1"
+>"1"</a></td>
        <td style="text-align: left; white-space: nowrap;">hello</td>
    </tr>
    <tr style="background: #B0C4DE;">
        <td style="text-align: center; white-space: nowrap;"><a href="
+http://sctesrv.india/cgi/project/viewprojectdetail.cgi?projectid=P-2"
+>"2"</a></td>
        <td style="text-align: left; white-space: nowrap;">googbye</td
+>
    </tr>
    <tr style="background: #F0F8FF;">
        <td style="text-align: center; white-space: nowrap;"><a href="
+http://sctesrv.india/cgi/project/viewprojectdetail.cgi?projectid=P-3"
+>"3"</a></td>
        <td style="text-align: left; white-space: nowrap;">friend</td>
    </tr>
    </tbody>
</table>
[download]