You seem to be aware that DBI is a way to do that. So, using DBI, create a database handle and make a single query. Now make another query using the same database handle. And another. You've just made multiple queries. If you need more help, post a little code (and output, error messages, etc.) to show what you've tried and what you're having trouble with.

Update: Thank you soooo much for updating your post so that my answer (and the next couple) now seem to make no sense at all. If you have a different question, consider posting a different node, replying to your own node, or adding to your original node. Please don't completely change your original node. Your post gets a "--" from me.