The primary MySQL web site is http://www.mysql.com/.
Additional DBI and CGI.pm documentation is available from the command line:
% perldoc DBI % perldoc DBI::FAQ % perldoc DBD::mysql % perldoc CGI.pm
Or online:
Programming Perl
Larry Wall, Tom Christiansen, and Jon Orwant. O'Reilly Media: 2000. ISBN: 0-596-00027-8
Perl Cookbook
Tom Christiansen, and Nathan Torkington. O'Reilly Media: 2003. ISBN: 0-596-00313-7
Programming the Perl DBI
Alligator Descartes, and Tim Bunce. O'Reilly Media: 2000. ISBN: 1-565-92699-4
Book-length coverage of DBI; one of the authors (Bunce) is its primary architect.
Official Guide to Programming with CGI.pm
Lincoln Stein. Wiley Computer Publishing: 1998. ISBN: 0-471-24744-8
Lincoln Stein is the author of CGI.pm; his book is the standard reference work on the module.
MySQL and Perl for the Web
Paul DuBois. New Riders: 2001. ISBN: 0-735-71054-6
This book uses CGI.pm extensively in combination with the DBI module to show how to integrate MySQL into web-based applications.