[CentralOH] Context Manager for Database Connection

[jep200404 at columbus.rr.com]

How would you improve the following context manager for 
a database connection? 

import mysql.connector

...

class DBOpen:
    def __init__(self, config):
        self.config = config.copy()
    def __enter__(self):
        self.cnx = mysql.connector.Connect(**self.config)
        return self.cnx
    def __exit__(self, exc_type, exc_value, exc_tb):
        self.cnx.close()

...

    with DBOpen(connection_config) as cnx:
        do_something(student_id)

The full code is attached in a tarball. 
Sample output using an actual database[1] follows.

(env)test at test:~/mysql$ python foo.py 3
6
(3, 1, 20)
(3, 2, 13)
(3, 3, 69)
(3, 4, 17)
(3, 5, 11)
(3, 6, 94)
(env)test at test:~/mysql$ 

If that's not a good question, feel free to correct it. 
Also feel free to correct how other things are done in the code. 

[1] for 2nd edition of Paul DuBois's "MySQL"
    http://www.kitebird.com/mysql-book/sampdb-2ed/sampdb.tar.gz

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