Personally, I'm inclined not to store the actual file contents in
the database, because I feel that it complicates matters. My
preference is to store the path to the file in the database, as well
as any metadata about that file, then just store the file in the
filesystem itself.
When you want to serve a file (I assume you mean over an HTTP
connection), you can just set up a script to grab the filename
from the db, grab the metadata, etc. I'm pretty sure you could
then just issue the correct Content-Type, then open up the
file and spit it out to the browser. Be sure to use binmode
if you're running on a Windows machine (or one that makes a
distinction between text and binary files).
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