[Twisted-web] database best practices

Drew Perttula drewp at bigasterisk.com
Sat Nov 29 17:00:23 EST 2008

Martin Bright wrote:
> What is the best way to implement synchronous DB access in a twisted 
> application?  I've read about defer.deferredGenerator, and various 
> threads about how it's a stupid idea to even attempt this. Do I have 
> restructure my code such that everything that depends on results from 
> a database query is in a callback to a deferred object?
I'm using deferredGenerator (and the yummier inlineCallbacks) all over 
with my database calls. My database is an RDF database that I talk to 
over HTTP (with my http://projects.bigasterisk.com/sparqlhttp/). The 
inlineCallbacks API is so great, you won't miss synchronous code at all.

My setup doesn't have transactions, which is one issue with twisted db 
access. I try to arrange my updates so only the last atomic piece 
matters. If something goes wrong, my worst case should be some orphaned 
data. Ebay might work like this too: 

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