How do i extract files from multiple layer of zip folders?

I am extracting zip files in memory and loading them in database that's where it threw me off as I am still learning. I don't really have knowledge on stream. This is what I am thinking right now. Extract and load files if not zip files. If zip moves to different location and comeback once all files get loaded. Do you think it's good approach or I can do it in better way.. There 800kplus files more than 80gbs