On Jun 11, 2010, at 12:51 PM, Chris Withers wrote:
> Hi All,
>
> We have engines set up like:
>
> engine1 = create_engine('mysql://username:passw...@server/db1')
> engine2 = create_engine('mysql://username:passw...@server/db2')
>
> ..and then have them bound to separate sessions, with separate model classes
> mapped to them.
>
> Now, mysql supports cross database joins, eg:
>
> select t1.colwhatever
> from db1.table1 as t1,db2.table2 as t2
> where t1.something=t2.something
>
> Is it possible to express that in SQLAlchemy, particularly at the ORM layer
> with the multiple session/engine/model setup described above?
> (I suppose the case to test would be, if ModelA is bound to engine1 and
> ModelB is bound to engine2, how would we do:
>
> session.query(ModelA,ModelB,ModelA.something==ModelB.something)
>
> ...or something similar, if the above isn't possible?
its not possible across two distinct database connections, no. Only the
database can do joins, and that requires a single connection session to do so.
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