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I have some excel files stored in a mysql datatbase that I have displayed in a table.
I am not going to respond to that specific question, but let you know that you could do this differently if you are not aware of this yet.
Except on very rare cases, it is not recommended to store any kind of file inside a DB. The best way to do is to let the file get stored outside the somewhere in the server and save the file and path in the DB. File is safe, no corruption and no huge sized DBs.
I would recommend you follow this way.