### 1.15.4.2 `web.wsgi.database` - Database Access

The `web.wsgi.database` module provides one class `Database` which adds the keys `'web.database.connection'` and `'web.database.cursor'` to the `environ` dictionary based on the parameters specified in the class constructor.

`environ['web.database.connection']`
  contains the `connection` object

`environ['web.database.cursor']`
  contains the `cursor` object

Middleware or applications further down the chain can access the database through these objects as follows:

    import web.wsgi.base, web.wsgi.cgi

    class Application(web.wsgi.base.BaseApplication):
        def start(self):
            self.output('<html>')
            self.environ['web.database.cursor'].execute('SELECT * FROM test')
            results = self.environ['web.database.cursor'].fetchall()
            for result in results:
                self.output('<p>%s</p>'%result)
            self.output('</html>')

    application = web.wsgi.database.Database(
        Application(),
        type='MySQLdb',
        database='test',
    )