I don't understand how can remote client application have the same
mapper setup in situation where there is no direct connection to
database to reflect the tables and map to the classes.
In addition at the server side the classes are declared only like
class XYZ(object):pass and the internal structure of the class is
created from reflected (autoload) tables.
Maybe I missed something, but I think, that I need the engine
connected to database and then metadata to map the classes and get
their internal structure (from reflected (autoload) tables) - but the
client side cannot connect to database.
I don't know what means "declarative" extension. This is the part of
the mapping code at server side:
class KLASS(object):pass
class SUBKLASS(object):pass
class SUBSUBKLASS(object):pass
table_T = Table('table', metadata,autoload = True)
subtable_T = Table('subtable', metadata,autoload = True)
subsubtable_T = Table('subsubtable', metadata, autoload = True)
mapper(KLASS,table_T,properties={'atr':relation(SUBKLASS,lazy=False)})
mapper(SUBKLASS,subtable_T,properties={'subatr':relation(SUBSUBKLASS,lazy=False)})
mapper(SUBSUBKLASS,subsubtable_T)
So, I don't understand how to repeat this definitions at client side
if there is no database connection (no metadata etc.)
Thank you very much, btw SQLAlchemy is great, although I'm not
programmer so I have never seen any ORM before :-)
Peter
On Fri, Jun 27, 2008 at 3:56 PM, Michael Bayer <[EMAIL PROTECTED]> wrote:
>
>
> On Jun 27, 2008, at 3:25 AM, Nabla wrote:
>
>>
>> Is there some easy solution of this problem?
>
> yes, the receiving application needs to have the same mapper() setup
> as the sender. If you use the "declarative" extension to setup your
> classes, this task is made easier.
>
>>
>> And additional question - is there some "simple" way how to
>> "convert" (marshal, serialize) reflected sqlalchemy class to "human-
>> readable" XML?
>
> we dont have an XML serializer but there might be something on Pypi
> for that.
>
> >
>
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