On Jan 3, 12:19 pm, mdipierro <mdipie...@cs.depaul.edu> wrote: > I agree. I think there should be a web2py type that merges the > functionalities of ListProperty on GAE and IS_IN_SET(multiple=True)
This is one instance of what I imagined has to happen when (some time ago) I mentioned that potentially there would be a separate DAL for non-RDB stores e.g. MongoDB [C++ - http://www.mongodb.org], couchDB [Erlang - http://couchdb.apache.org/], Amazon SimpleDB [http:// aws.amazon.com/simpledb/ - compare w/ http://aws.amazon.com/s3] are listed as document-oreinted on Wikipedia; GAE - if you follow WIkipedia correlations - is of a class with Hypertable, Cassandra [Facebook:Java - http://incubator.apache.org/cassandra/], and Project Voldemort [Linkedin:Java - http://project-voldemort.com/], and Hadoop [Yahoo search:Java - http://hadoop.apache.org/ ]). Some things are beginning to become clear about all these cloud computing vs. storage technology strategies & evolutions - while some may favor one, they are loosely coupled, so I expect that what serves the application will take precedence over how that can get implemented on the cloud (GAE / Big Tables seems to be the cloud image of shared hosting: you get to run what they provide - java & python in this case - and use the "db" they have installed - big tables in this case; Amazon services seem generally closer to a virtualized hosting, with simpleDB being a nod to a "db" kind of storage app, pre-canned). I don't think this realization (cloud analogies) should affect much about DAL evolution: GAE etc. should still be mined for conceptual similarities, and over time decisions should emerge about what is worth making portable - e.g. depending on backend, letting backend facility be accessed, or do / abstract something similar in framework. DAL will thus help equalize / cross-polinate; this should be only with the _really_ useful or needed concepts. </end random thoughts> - Yarko > > On Jan 3, 11:52 am, Yarko Tymciurak <resultsinsoftw...@gmail.com> > wrote: > > > > > This is directly obvious, but I will state it anyway: > > > On Dec 30 2009, 1:17 am, mdipierro <mdipie...@cs.depaul.edu> wrote: > > > > I changed this. It was UGLY. > > > > Now you can do: > > > > from gluon.contrib.gql import gae > > > db.define_table('person',Field('names',gae.StringListProperty())) > > > for a DAL (abstraction layer), this is tied to _one_ persistence store > > (the string method was not). > > > The good part of this (from a programmer's perspective) is that it is > > explicit - you know "StingListProperty" is intended to be a gae thing; > > > The bad part: it erodes the concept of portability, the prime goal of > > DAL ... > > > It may be useful for the moment, but there is a design tension which > > is begging for a more comfortable resolution ... > > > > and you can do: > > > > db.person.insert(names=['Massimo','Max']) > > > db(db.person.names=='Massimo').select() > > > > So you can use any native google type AND you can make your own. > > > Perhaps you can say a little more on "... and you can make your > > own."? > > > Thanks, > > - Yarko > > > > Massimo > > > > On Dec 30, 12:50 am, mdipierro <mdipie...@cs.depaul.edu> wrote: > > > > > There are many GAE types that one may want to use. Today I needed > > > > StringListProperty so I extended the web2py GAE apy so that you can > > > > have a field of type > > > > > db.define_table('person',Field('names','.StringListProperty()')) > > > > > and you can do > > > > > db.person.insert(names=['Massimo','Max']) > > > > db(db.person.names=='Massimo').select() > > > > > Basically you can put any native type as a web2py type just put it in > > > > a string and start it with a '.'. You can also pass arguments this > > > > way. > > > > > It is ugly but works. It is ugly because I'd rather pass an object > > > > than a string. It works because a type has to be a string. It is > > > > experimental because when the new DAL comes this should be replaced by > > > > a better API. This will not stay backward compatible. > > > > > Massimo- Hide quoted text - > > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "web2py-users" group. To post to this group, send email to web...@googlegroups.com. To unsubscribe from this group, send email to web2py+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/web2py?hl=en.
