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tornado_demo.py
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tornado_demo.py
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import tornado.web
import tornado.httpserver
import tornado.ioloop
import database
class BaseHandler(tornado.web.RequestHandler):
@property
def db(self):
return self.application.db
#
# Creates a new user, when you hit the url
# http://localhost:8080/user/new?id=100&name=jane
#
class NewUserHandler(BaseHandler):
def get(self):
idstr = self.get_argument("id", 10)
id = int(idstr)
name = self.get_argument("name", "john")
sqlstr = 'insert into users (id,name) values (%d, "%s");' % (id,name)
self.db.execute(sqlstr)
#
# Get all users if you go to
# http://localhost:8080/ or
# http://localhost:8080/user
#
# Get a specific user (e.g. id=100) if you go to
# http://localhost:8080/user?id=2
#
#
class GetUserHandler(BaseHandler):
def get(self):
idstr = self.get_argument("id", "0")
id = int(idstr)
# if no id, get all users. Else get the specific id
if id == 0:
userList = self.db.query("select * from users")
if userList is None: userList = []
else:
sqlstr = 'select * from users where id = %d' % (id)
user = self.db.get(sqlstr)
userList = [user]
outp = ""
for user in userList:
outp = outp + "<br> user (%d) => %s" % (user.id, user.name)
self.write("<html><body>" + outp + "</body></html>")
class Application(tornado.web.Application):
def __init__(self):
handlers = [ (r"/", GetUserHandler), (r"/user/new", NewUserHandler), (r"/user", GetUserHandler) ]
settings = {}
tornado.web.Application.__init__(self, handlers, **settings)
self.db = database.Connection()
self.db.execute('create table users (id integer, name char(20));')
self.db.execute('insert into users (id, name) values (1,"jack");')
self.db.execute('insert into users (id, name) values (2,"jill");')
def main():
settings = { }
http_server = tornado.httpserver.HTTPServer(Application())
http_server.listen(8080)
tornado.ioloop.IOLoop.instance().start()
if __name__ == "__main__":
main()