Hi burgiduroy, On Wednesday, 11 July 2012 15:24:59 UTC, burgiduroy wrote: > > Are there any performance difference between the two? > > for row in query_object.all(): > do_something() > > AND > > for row in query_object: > do_something() >
The first fetches and processes all rows in one go before executing the loop body. The second streams them in. How much that really matters depends on the DBAPI (it may fetch all rows in one go anyway), and maybe on how heavy the object mapping is ... and on whether you end up exiting your loop early (and so avoid processing the rest unnecessarily). Regards, Gulli -- You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To view this discussion on the web visit https://groups.google.com/d/msg/sqlalchemy/-/rtdpsUfOa1QJ. To post to this group, send email to sqlalchemy@googlegroups.com. To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en.
