I am designing a GUI for a QGIS plugin I am developing, which is intended to plot information from a MySQL database. In the GUI, I would like to have a combo box of all the database connections saved in QGIS.

These can be viewed by printing `allKeys()` for `QSettings()` in `PyQt4.QtCore`. When this is done, the keys I am interested in are:

    ...
    MySQL/connections/adsb/database
    MySQL/connections/adsb/host
    MySQL/connections/adsb/password
    MySQL/connections/adsb/port
    MySQL/connections/adsb/save
    MySQL/connections/adsb/username
    MySQL/connections/database
    MySQL/connections/host
    MySQL/connections/password
    MySQL/connections/port
    MySQL/connections/save
    MySQL/connections/selected
    MySQL/connections/strath_adsb/database
    MySQL/connections/strath_adsb/host
    MySQL/connections/strath_adsb/password
    MySQL/connections/strath_adsb/port
    MySQL/connections/strath_adsb/save
    MySQL/connections/strath_adsb/username
    ...

Where 'adsb' and 'strath_adsb' are databases. How would it be possible to read the names of all connected databases and store them in an array, so that they could then be displayed as options in the combo box?