you can pass a StringIO instance instead of the open(filename, 'rb') ....
To avoid the double-pass just create the csv as a StringIO stream and
insert it directly into the table with the db.tablename.field.store() as
the example you posted: web2py will save the file into the uploads/ folder
and no problem with that.
Untested example: assuming in your "generatecsv" function has something
like....
destination = open('path_to_file', 'wb')
writer = csv.writer(destination)
writer.writerow(['a', 'row'])
destination.close()
you can do instead
from cStringIO import StringIO
destination = StringIO()
writer = csv.writer(destination)
writer.writerow(['a', 'row'])
db.reportcsv.insert(csvfile=db.reportcsv.csvfile.store(destination,'path_to_file'),reportname='report_1')
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