Is there any Python implementation for transaction?
2011/2/16 Gaurav Sharma <gaurav.gs.sha...@gmail.com>: > Enterprise applications is a very broad topic. There's no one answer for > every type. > > You specifically mention a transactional scenario. For that, I can recommend > you look at Cages (http://code.google.com/p/cages) if you haven't already. > > On Feb 15, 2011, at 19:45, Ritesh Tijoriwala <tijoriwala.rit...@gmail.com> > wrote: > >> Hi, >> I have general questions on writing enterprise applications on cassandra. I >> come from a background which involves writing enterprise applications using >> DBMS. >> >> What are the general patterns people follow in Cassandra world when >> migrating a code that is within transaction boundaries in a traditional DBMS >> application? for e.g. transfer $5 from account A to account B. The code >> would normally look like: >> >> beginXT >> try { >> A = A - $5; >> B = B + $5; >> commitXT; >> } catch (....) { >> rollbackXT; >> } >> >> The effect of this is that either both statements execute, or none. The sum >> of account balances remain constant. How does one deal with this type of >> code when writing on top of Cassandra? I understand that consistency will be >> eventual and its fine that eventually, sum of both account balances remain >> constant but how to detect that a transaction failed and only step "A = A - >> $5" has executed and the later step has not been executed? >> >> Are there any sample applications out there where I can browse code and see >> how it is written? For e.g. customer purchase order application, etc. which >> atleast involves some concept of transaction and has code to keep things >> consistent. >> >> Thanks, >> Ritesh >
