You don't need to move anything. Let the MySQL engine deal with the db files.

In tutorials there is the answer to your question.
Check Reading from a database for details.

If you've read Dubois's book, I wonder what you'd need more, but here goes: (untested)

#!/usr/bin/perl -w
use strict;
use DBI;
my $database = 'test';
my $username = 'username';
my $password = 'secret';
my $dbh=DBI->connect("dbi:mysql:$database",
$username,$password,
{RaiseError=>1}) or die "can't\n";

#if you get this far, you're connected
# and you can list the tables in your db

print "$_\n" for $dbh->tables;

$dbh->disconnect();
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Update

Did you set a user and password in MySQL, or are you running as root without a password? (default out-od-the box).

If that's the case, you should authorize a new user with a password:

use mysql;
set password=password('rootpassword');
update user set password=password('rootpassword') 
where user='root';
delete from user where password='';
grant all privileges on testdatabase.* to kiat 
identified by 'yourpassword';
flush privileges;
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Then log in as 'kiat' (mysql -u kiat -p) and you should be able to use that db, and also the script should work.

For more info, see the appropriate docs.