A. There is a choice :-

a. SybPerl (Note that SybPerl is designed for Sybase really so you may have the same compatibility problems as with CT-Lib). http://www.mbay.net/~mpeppler
b. A SQL Server port of the above. http://www.algonet.se/~sommar/mssqlperl/index.html
c. ODBC using the ODBC extension http://www.roth.net/odbc/
d. If the version of Perl has COM extensions then you can use ADO
e. Search www.perl.com for any other code available on the standard CPAN sites. (e.g. DBD::ODBC). For more info on DBI/DBD see http://www.symbolstone.org/technology/perl/DBI/index.html