First you need to identify what makes a file unique. Is it the contents of a row? a set of rows? a row ID? Second, you need to write code to query your existing database to see if your uploaded file has already been added (run a SELECT to see if the rows you are about to add have already been added).
Adding rows to a database from an uploaded CSV file is not a typical CakePHP project. It can be done. Actually it's on my someday/maybe ToDo list.
-- Adding rows to a database from an uploaded CSV file is not a typical CakePHP project. It can be done. Actually it's on my someday/maybe ToDo list.
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