To be fair, the most popular option right now is SQLAlchemy, an ORM. DAL appears to be a minority approach. So, ORM must be good at something right?
To get web2py out of the PR's ditch, I think it's best to refrain from commenting on perceived weaknesses of Django and other technologies. On Jan 26, 11:08 am, blackthorne <francisco....@gmail.com> wrote: > few people mention this, don't know why but it is huge. > ORM's are a computational vietnam. > > it troubles my mind, how come so many good programmers don't have this > notion and ORM's are actually very well seen. > the relational model has its own way of working, its mindset, its > optimizations. the object model works in a different way, its > implementations have an higher sofistication for each data unit that > knows all about itself and considers less fast searches as you can do > with relational databases and its simpler way of storing things > allows. > > the result of using an ORM is having a complex translation process > from objects to SQL, then you get a second major loss because the > generated is very bad, very generic, not specific. then, you a third > major loss when you have to translate the resulset from SQL to objects > again. > > many times, reality is much worse. if you make things like > dog.getName() == cat.getName() the ORM will make > select * from dog > select * from cat > put everything in memory and then make the search in memory. having an > extremely optimizes relational database is probably worst than having > simple files with pickles, really.. > > bottom line, you want to store objects and make queries over them, use > object oriented databases. they exist, not by chance.. you have db4o > in Java, ZODB in python. > else if you want relational databases, use their language SQL or the > smallest abstraction possible. > > On Jan 26, 3:50 pm, Martín Mulone <mulone.mar...@gmail.com> wrote: > > > 2011/1/26 Massimo Di Pierro <massimo.dipie...@gmail.com> > > > The DAL tries to be as close as possible to SQL. The ORM > > > > tries to stay as close possible to an Object model. To me that is > > > trying to put a circle into a square. When it fits great, some times > > > it does not fit. > > > > Massimo > > > Quote of the day!. > > > -- > > Pablo Martín Mulone (mar...@tecnodoc.com.ar)http://www.tecnodoc.com.ar/ > > Paraná, Entre Ríos, Argentina (CP 3100). > > > My blog:http://martin.tecnodoc.com.ar > > Expert4Solution > > Profile:http://www.experts4solutions.com/e4s/default/expert/6 > >
