As advised in your recent posts, you need to read the documentation. In this instance DBIx::Class and DBIx::Class::ResultSet. You were given this advice most recently a couple of hours ago Re^3: Database mySQL and some days ago Re: Database MySQL Perl. Continuing to ignore advice when asking for help isn't a wise strategy.

You have posted several questions relating to DBIx::Class, but the post titles you give aren't great, and you don't mention DBIx::Class at all. How do I compose an effective node title? and How do I post a question effectively? have good advice on this. When asking for help it's best to make it as easy as possible for people to provide help. I suggest you take the time to read and understand the following:

• PerlMonks for the Absolute Beginner
• perlintro
• Perl FAQ
• http://learn.perl.org
• http://perldoc.perl.org
• Browse the Tutorials section of this site.