>>I check the file name and see if it already exists in the database.
If it does, then I return the error. If it doesn't exist, then go and
perform the <cffile> action.

This is the way you see it, but not the best and easiest way to do it.
This is the way I do it:
- upload the file and rename it on the server with a unique local name, 
ie: CreateUUID()
- store in the database both the local name and the original name.

This way, you can have several files with the same original name.
When a user retrieves a file, you can read it using the local name,
and send it under the original name, users will never see the local name.

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