Michael Bayer wrote:
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.
Right, but how can I create an engine such that it can be used to access two databases? Is it as simple as setting the __tablename__ as 'db.tablename' rather than just 'tablename'?
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