> > A couple of questions on the tutorial: > > > 1) Why .all() in 3rd (and some others) "query" code box, but not > > others? > > .all() is essentially equivalent to list(query). Some of the > examples already iterate the query, such as for x in query: print x, > others don't - but the tutorial wants you to see the results. > Ideally none of the examples would use all() since you generally > iterate to get results. >
Ah OK. > > Why or_(), and_(), in_(), but like(). > > (instead of like_() ) > > or/and/in are Python reserved words, it's convention per pep8 to > rename functions/variables with a trailing underscore if they conflict. > I see. > > 4) Common Filter Operators: Is '!= None' the correct way to get a "NOT > > NULL"? (Not mentioned in tutorial) > > that will work yes > > > 5) Common Filter Operators: Using User.name.match raised an > > "(OperationalError) unable to use function MATCH in the requested > > context"... why? (using sqlite:memory is per tutorial) > > MATCH is not supported by every database, SQLite is apparently one of > them. I'm a little surprised that operator found its way into the > tutorial since I've never used it.... Thank you. A very clear explanation. :) I don't know if the docs team reads this, but here are a couple of comments: 1) Perhaps re-emphasize, in a few more places, SA's overloading of the logical operators. I had forgotten that by the time I got to the query filter section. 2) Since there are two alternative paths to take take in the class / table building part (mapper / declarative), it not clear what the prerequisites are for the 2nd path. To fix this, please show resetting the python interpreter after the mapper example, and re-importing all that is actually needed for the declarative version. 3) Mention the "right way" to filter by "NOT NULL". 4) Mention the reservedword_() naming convention in passing. It should be known to Python programmers, but since this is a tutorial, it could be there are new Python users here as well. 5) Since the tutorial actually shows using SQLite, mention that the .match() directive is not supported by SQLite. I hope to finish the tutorial over the next few days, and may have more comments then. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. 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 -~----------~----~----~----~------~----~------~--~---
