Perhaps the best documentation for how to program in Perl to the MySQL database comes with the perl module itself. I perfer using the Mysql.pm package. The documentation for the package contains a full set of examples showing how to use each function. This package and its dependants are usually available with your distribution. If not, visit http://search.cpan.org to find the latest versions.
Another good reference is the O'REILLY book MySQL and mSQL. This book discussion database access from many different languages including Perl. The sample chapter from the book, avaialble on the O'REILLY site, is the chapter on Perl. You can also read the entire book online if you are a Safari Bookshelf member.
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