Tomas,
I mean i am using web.py + sqlalchemy :)
2013/4/20 Alexander Kozlovsky <alexander.kozlov...@gmail.com>
> Hi, Pony ORM developer here. We just get first public attention today, so
> I don't think there are many
> experienced Pony ORM users exist at this moment (April 2013) ;-)
>
> I think that currently Pony ORM is suitable for experiments, but probably
> not for immediate in-production usage.
> Currently Pony ORM is a great toy, and during the next few months we must
> implement several tasks in order
> to get complete product. For example, we must add support of Psycopg2
> PostgreSQL driver (currently we work
> with PostgreSQL via PyGreSQL which is not as popular as Psycopg2). This is
> not hard, but just takes some time.
> Also, we must add migration support (and its implementation will be really
> cool, we plan to get migrations
> automatically from diagram changes in visual diagram editor).
>
> I expect Pony ORM will be fully production-ready a few months later.
>
> Regarding to benefits of using Pony ORM, I think its mainly in higher
> level of abstraction. With Pony, you can
> write query to database as if you write simple python generator to iterate
> over ordinary python list of objects.
> So, you can do something like this
>
> orders = select(o for o in Order if o.date_shipped.year == 2012)
>
> And you get optimized SQL query which return list of order objects. You
> can pass this objects between
> several layers of you application, and when some of this objects are
> updated, Pony ORM accumulates
> these updates and then send changes to database on commit() execution.
>
> The main architectural difference between Pony ORM and SQLAlchemy is this:
> SQLAlchemy based
> on relational data model, and can write queries to relational databases
> only, whereas Pony ORM
> internally based on "entity-relationship" model which is independent of
> SQL. So, in the future, Pony ORM
> could be used with NoSQL databases such as MongoDB. But currently only SQL
> databases are supported.
>
> So, at the current time the main difference between Pony ORM and
> SALAlchemy is that SQLAlchemy
> queries are more verbose. For example, this is Pony ORM query:
>
> select(o for o in Order if o.date_shipped.year == 2012)
>
> And this is equivalent SQLAlchemy query (did't test it):
>
> session.query(Order).filter(extract("year", Order.date_shipped) ==
> 2012)
>
> This is really the matter of taste and personal preferences, so no
> critique here.
> SQLAlchemy is great ORM, but I just forget correct query syntax every time
> :)
> I hear from many people that they cannot handle SQLAlchemy "complexity",
> so maybe Pony ORM will be good choice for them.
>
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Aydın Şen
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