Is there a solution to auto-post data to a WP post from a database

I'm looking to add posts to my WP website from a (self managed) database source - could be form or excel/CSV data, either internally (in WP itself) or external, i.e. from an excel sheet in Dropbox. I have a lot of data to upload and doing this in each post is very time consuming. If I could add it to a form or excel sheet and that would push to a WP database/post it would dramatically reduce my production time. Even possibly have a (hidden) WP page with a form in it linking to the WP database.