Added DB-API tutorials.

Author: mahmoudhossam

docs/scenarios/db.rst

@@ -9,7 +9,9 @@ database access modules. It's documented in `PEP 249 <http://www.python.org/dev/
 Nearly all Python database modules such as `sqlite3`, `psycopg` and
 `mysql-python` conform to this interface.
 
-
+Tutorials that explain how to work with modules that conform to this interface can be found
+`here <http://halfcooked.com/presentations/osdc2006/python_databases.html>`_ and
+`here <http://www.amk.ca/python/writing/DB-API.html>`_.
 
 SQLAlchemy
 ----------