How to using Fat Free framework with Oracle Database

how to connect to oracle (11g express edition) database with Fat Free Framework? Currently I am using this config (config.ini):

db_dns=oci:host=localhost;port=1521;dbname=
db_name=xe
db_user=username
db_pass=password

But it is not working. The error says:

Internal Server Error.
could not find driver

But I already install the driver (oci8)

Solution

How do you build your connection string from that config? try this:

$db=new \DB\SQL('oci:dbname=//localhost:1521/xe','username','password');