On Sep 26, 2008, at 9:23 AM, Doug Farrell wrote: > I'm trying to represent a many-to-many relationship between the > press_table and the press_routing table using the linking table, > press_routing_press. I think I've got the table structure and > mapping set up, but now I need some help to build a query using > SqlAlchemy that does the same thing as this MySQL query: > > select p.id, p.code > from press p > inner join press_routing_press prp > on p.id=prp.press_id > inner join press_routing pr > on pr.id=prp._press_routing_id > where pr.code='A' > >
Hi Doug - this kind of join is described at http://www.sqlalchemy.org/docs/05/ormtutorial.html#datamapping_joins , the fourth example (albeit its for a one-to-many, the approach is the same with a "secondary" table). The approach here is: sess .query(Press).join(Press.routes).filter(PressRouting.code=='A').all() --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
