Haven't looked it over thouroghly yet, but the database code raised my eyebrow a bit. I wonder why you chose to build full sql statements with inline params and their associated quoting problems, rather than use DBI's parameters, which take are of those problems rather nicely?

Part of the point of DBI is to stay independent of the underlying database. It would certainly be a plus if your server would run with, say PostgreSQL, or DB2, as well.

In the 'make it pretty' department, I've taking to using q// to make the sql more readable, i.e.

$statement_handle = $database_handle->prepare (q/
    select col1, col2, col
    from table1
    where col6 = ?
    /);
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... or something along those lines.

Keep on playing and learning! Gotta have some fun in life :)