API for mobile application on qt?

Question

PostgreSQL

Please tell me how to organize?
Now I use QTcpSocket, direct queries to the database with an offset of +/-1 characters.
1. Exchange JSon arrays.
2. Collect the request to the heap and send it when it arrives.
3. The ability to assemble several requests at once (from different devices with different tyrnets).
I would like to take it already ready :) Maybe not on Qt you can use a python.