[Twisted-Python] using defers with requests

charles brandt twisted at st.imul.us
Sat Nov 15 21:57:38 EST 2003

I am trying to select some data from a database in hopes of eventually using
it to populate a dynamic page.  Before I dive into woven, I was trying to
get the following to print selected data directly to a html resource using
the following code snippet (or various versions of it).   I've only been
able to get an empty page though ( <html><body></body></html> ).  I'm
wondering if maybe the request is getting returned before the callback makes
it to the defer?  Any ideas? Thanks in advance,


from twisted.web import resource, server
from twisted.enterprise import adbapi

dbpool = adbapi.ConnectionPool(<connection stuff>)

def getData(data):
    return dbpool.runQuery("SELECT * FROM some_table WHERE some_column =
%s", data)

def printResult(data, request):

class myResource(resource.Resource):
    def render(self, request):
        d = getData("some string")
        d.addCallback(printResult, request)
        return server.NOT_DONE_YET

resource = myResource()

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