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View File Name : psycogreen_green.py

import uwsgi
import psycopg2


def ugreen_wait_callback(conn, timeout=-1):
	"""A wait callback useful to allow uWSGI/uGreen to work with Psycopg."""
	while True:
		state = conn.poll()
		if state == psycopg2.extensions.POLL_OK:
			break
		elif state == psycopg2.extensions.POLL_READ:
			uwsgi.green_wait_fdread(conn.fileno())
		elif state == psycopg2.extensions.POLL_WRITE:
			uwsgi.green_wait_fdwrite(conn.fileno())
		else:
			raise Exception("Unexpected result from poll: %r", state)

			

# set the wait callback
psycopg2.extensions.set_wait_callback(ugreen_wait_callback)


def application(env, start_response):

	start_response('200 Ok', [('Content-type', 'text/html')])

	# connect
	conn = psycopg2.connect("dbname=prova user=postgres")
	# get cursor
	curs = conn.cursor()

	yield "<table>"

	# run query
	curs.execute("SELECT * FROM tests")

	while True:
		row = curs.fetchone()
		if not row: break
		yield "<tr><td>%s</td></tr>" % str(row)

	yield "</table>"

	conn.close()