Retrieving BLOBs from database

Hi guys,
Any help here would be most appreciated. I have a table, one field of which is type BLOB. I wish to extract this data using a Coldfusion page and have the user be able to save it (similar to an attachment). I have my reasons for not placing the data elsewhere and linking it. I would appreciate it if someone could help me out with a little code here. The BLOBs are already inserted, so that isn't really an issue. Just retrieving it. For example:

A .zip file is saved in the BLOB. There is a field, fileName, which holds the original filename of the BLOB. I want to get the user to be able to retrieve this by inserting a value (Primary Key), which will do a query, and retrieve the appropriate file, allowing them to "save as", similar to attachments. Any help would be most appreciated. Thanks again!
Sincerely,
JL