[Twisted-Python] db connections

[Pet]

On Tue, Mar 24, 2009 at 5:04 PM, Rob Hoadley <hoadley at gmail.com> wrote:
> You'd want to use a connection pool to manage the db interaction.
> Your server is pretty unusable after a db connection failure.  I've
> used the connection pool before with a cp_min of 1 and a cp_max of 2.

Honestly speaking, I don't understand, what does it mean.
I'm already using connection pool with default cp_min an max, don't I?
Could you explain me, as for a newbie, please

>
> http://twistedmatrix.com/documents/8.2.0/api/twisted.enterprise.adbapi.ConnectionPool.html
>
>
> On Tue, Mar 24, 2009 at 6:45 AM, Alvin Delagon <adelagon at gmail.com> wrote:
>> Put self.dbcon in the MyFactory class. MyProtocol instances can access it
>> via self.factory.
>>
>>
>> On Tue, Mar 24, 2009 at 6:10 PM, Pet <petshmidt at googlemail.com> wrote:
>>>
>>> Hi,
>>>
>>> I've wrote an daemon which does some queries to db and sends response
>>> back to client. Do I need to make for every request from client (new
>>> instance of  MyProtocol) a new connection to DB? Or can I somehow
>>> prepare connection, so I could save some time? Maybe make connection
>>> in Factory and pass it to Protocol? But what happens if too much
>>> clients are connected to server? What is the way to control it?
>>>
>>> Regards, Pet
>>>
>>>
>>> class MyProtocol(basic.LineReceiver):
>>>
>>>    def __init__(self):
>>>        print "new connection"
>>>        self.dbcon = adbapi.ConnectionPool("pyPgSQL.PgSQL",
>>> database="data", user='pet', host='local', password='some')
>>>
>>>
>>> class MyFactory(protocol.ServerFactory):
>>>    protocol = MyProtocol
>>>
>>> class MyService(internet.TCPServer):
>>>    def __init__(self):
>>>        internet.TCPServer.__init__(self,PORT,MyFactory())
>>>
>>> def main():
>>>    reactor.listenTCP(PORT, MyFactory())
>>>    reactor.run()
>>>
>>>
>>> if __name__ == '__main__':
>>>    main()
>>>
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>>
>>
>>
>> --
>> http://www.alvinatorsplayground.blogspot.com/
>>
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