package PerlSvc;
use Win32::Service;
use Win32::TieRegistry(Delimiter=>"/");
use DBI;
use DBD::ODBC;
use Win32::EventLog;
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use strict; is missing.

# the short name by which your service will be known (cannot be 'my')
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Please document *why* something is not possible, instead of just "can't do this".

${$_}{'CurrentState'}
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I think $_->{'CurrentState'} is easier to read. (I'd even leave out the quotes.)

$dsn="driver=\{SQL Server\}\;Server=$srv\;UID\=$uid\;PWD\=$pwd\;";
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It's clearer and much easier to read if you don't escape things that don't need escaping: $dsn = "driver={SQL Server};Server=$src;UID=$uid;PWD=$pwd;";

    $exec=$dbh->prepare("...");
    $exec->execute;
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Do check the return values. In a module, it's better to turn PrintError off and handle errors yourself.

$exec=$dbh->prepare("... values ('$cn', '$sname', $state)");
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Don't interpolate arbitrary values in a query. Use placeholders instead.

    $exec->finish;}else{
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Why does the else not have its own line?

}
}else
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No two closing curlies can be in the same column in proper indented code.

        unless (${$_} eq "1"){
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Are you sure you want a string equality test? Not a numeric one? Or maybe even a boolean test? (unless ($$_) { ... })

            $dsn="driver=\{SQL Server\}\;Server=$srv\;UID\=$uid\;PWD\=
+$pwd\;";
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You're repeating code. It's better to put that string in a more global variable. I personally like having a sub 'db' that returns a dbh: sub db { DBI->connect("dsn here") }

}
sleep(5);
}
}
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Again: this should never happen.

    Win32::Service::GetServices("", \%tmp);
...
            if (Win32::Service::GetStatus("",$_,\%{$_})){
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You sometimes have a space after comma, you sometimes don't. Whatever style you choose, be consistent. (I like having a space after commas)

"$DisplayName"
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Those quotes should not be necessary. Use plain $DisplayName instead.

print "No help available.\n";
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Very helpful :)

In general: learn about indenting, use strict, learn about writing modules, get to know Perl a little better. Good luck and have fun.

Juerd
- http://juerd.nl/
- spamcollector_perlmonks@juerd.nl (do not use).