[Qgis-developer] QGIS database functionality

[Mark.Gibbons at csiro.au]

Hello,
I'm looking to develop an application that will act like a loosely-coupled server. It will store geospatial data of various formats in the database, and will serve requests from other applications to get / put data in the database.
Is QGIS suitable for this?
Can data from the data store be retrieved via the server and rendered separately?
Is QGIS efficient for continuous updating of data and continuous retrieval of data, for example so that a moving object can be easily rendered?
Does QGIS support using Oracle / Oracle Spatial as the dbms?
Does the QGIS API let you access the database easily?

I had a look at pyQGIS and it looks like you connect to the database with the dataSourceURI, from then on everything with the database is automated? When you create a new vector it automatically saves it in the database?

Thanks in advance!