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I've signed up into Oracle Application Express for my school education purposes (I need free Oracle db hosting). I am developing web application which I would like to be connected to db which Oracle given me with App Express. My problem is that I don't know where to get connection string for this db or if it is even possible to get.
Thank you very much :)
If I understand your question, you're trying to use the database provided at apex.oracle.com as just a standard Oracle db and build your own independent web app using that as the backend db? If so, you can't. The apex.oracle.com setup is designed purely for learning and experimenting with apex.
This is confirmed here
If I understood your question!
I'm not aware of any free Oracle hosting other than downloading free versions from Oracle and hosting on your own computer.