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import psycopg2 def pg_wait(conn, env, timeout=0): while 1: state = conn.poll() if state == psycopg2.extensions.POLL_OK: raise StopIteration elif state == psycopg2.extensions.POLL_WRITE: yield env['x-wsgiorg.fdevent.writable'](conn.fileno(), timeout) elif state == psycopg2.extensions.POLL_READ: yield env['x-wsgiorg.fdevent.readable'](conn.fileno(), timeout) else: raise psycopg2.OperationalError("poll() returned %s" % state) def application(env, start_response): start_response('200 OK', [('Content-Type', 'text/html')]) connection = psycopg2.connect(database='uwsgi',user='uwsgi',password='uwsgi',host='192.168.173.100', async=1) for i in pg_wait(connection, env, 3): yield i print("connected") cursor = connection.cursor() cursor.execute("SELECT * FROM foo") for i in pg_wait(cursor.connection, env, 3): yield i print("query result available") for record in cursor: yield str(record) connection.close()