I was wondering how a big company make a barcode system? Are there any barcode databases off the web that I could just download as a whole? And once I had one where would I go to update the already existing database?
closed as not a real question by Ƭᴇcʜιᴇ007, Traveling Tech Guy, Keltari, Brad Patton, Tog May 3 '13 at 6:37
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Yes there are, take a look at question asked on StackOverflow: Database of commercial barcodes
It is all about ready-made databases. However, every company must decide how they do it, there's many paths to the goal and methods often depends on predefined requirements.
It seems that http://gepir.gs1.org has comprehensive database but I dont know if it is open for anyone. See another link for more of them.
They might "load" data from list of received goods :) Usually there's someone doing inquiries and orders, that guy already works on product database and therefore may as well enter new, update existing and remove obsolote data to/from database.
There is no just one correct path to achieve so broad goal. Maybe you could provide some more information by edinting your question and explaining better what are you trying to accomplish.