[storm] 【Storm】How does Storm do to works very well connecting to several databases ?

[James Henstridge]

2008/8/26 刘建敏 <szu_ljm at 163.com>:
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>
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>  Hi everybody :
>     I don't understand "Storm works very well connecting to several
> databases and using the same Python types (or different ones) with all of
> them. "     How does Storm do ? Can you give me a example ?

Lets say you have two databases that share the same schema but have
different data.  You can define a single class (lets say Foo) that
represents one of the tables in the schema, and use it to represent
rows from either database.  Something like:

    class Foo(object):
        __storm_table__ = "foo"
        id = Int(primary=True)
        ....

    store1 = Store(create_database("postgres:database1"))
    store2 = Store(create_database("postgres:database2"))

    foo1 = store1.get(Foo, 42)
    foo2 = store2.get(Foo, 42)

The point here is that the class "Foo" is not bound to a particular
database connection.  Instead, instances of "Foo" are bound to
database connections.  So "foo1" and "foo2" are distinct objects.


>     If now , I want use memcache , does it work ? how can i use it ?

We don't have any direct support for memcached.  You'd probably have
to implement support for it on top of Storm somewhere in your app.

James.