[sqlalchemy] Re: table union through ORM
On May 6, 2008, at 7:49 AM, Eric Lemoine wrote: Hello Here's my thing: I have two DB tables, refugees and offices, which are independent tables (no foreign key). I already have two mappers for those tables: mapper(Refugee, refugees_table) mapper(Office, offices_table) In addition to being able to do independent queries on each table, I'd like to do queries in both tables (UNION) and get results in objects of type Location (a Python class of my own). In other words, I'd like to do queries using session.query(Location). I've tried various things (Mapping a Class against Multiple Tables in the doc in particular), but with no luck. Does anyone have suggestions? this would be concrete table inheritance: http://www.sqlalchemy.org/docs/04/mappers.html#advdatamapping_mapper_inheritance_concrete Both Refugee and Office would need to include Location as at least one of their base classes. --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
[sqlalchemy] Re: table union through ORM
On Tue, May 6, 2008 at 4:24 PM, Michael Bayer [EMAIL PROTECTED] wrote: On May 6, 2008, at 7:49 AM, Eric Lemoine wrote: Hello Here's my thing: I have two DB tables, refugees and offices, which are independent tables (no foreign key). I already have two mappers for those tables: mapper(Refugee, refugees_table) mapper(Office, offices_table) In addition to being able to do independent queries on each table, I'd like to do queries in both tables (UNION) and get results in objects of type Location (a Python class of my own). In other words, I'd like to do queries using session.query(Location). I've tried various things (Mapping a Class against Multiple Tables in the doc in particular), but with no luck. Does anyone have suggestions? this would be concrete table inheritance: http://www.sqlalchemy.org/docs/04/mappers.html#advdatamapping_mapper_inheritance_concrete Both Refugee and Office would need to include Location as at least one of their base classes. In the Concrete Table Inheritance example in the doc, there's an employee table. In my case, there's no location table, and that's why I haven't seen Concrete Table Inheritance as my case's solution. So I'm still confused on how I'm going to achieve what I want. Thanks a lot, -- Eric --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
[sqlalchemy] Re: table union through ORM
On May 6, 2008, at 11:13 AM, Eric Lemoine wrote: In the Concrete Table Inheritance example in the doc, there's an employee table. In my case, there's no location table, and that's why I haven't seen Concrete Table Inheritance as my case's solution. So I'm still confused on how I'm going to achieve what I want. you wouldnt have the location table, and the Location mapper would be mapped directly to the polymorphic union , i.e. mapper(Location, pjoin). --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
[sqlalchemy] Re: table union through ORM
Thanks a lot. I'll try that 2008/5/6, Michael Bayer [EMAIL PROTECTED]: On May 6, 2008, at 11:13 AM, Eric Lemoine wrote: In the Concrete Table Inheritance example in the doc, there's an employee table. In my case, there's no location table, and that's why I haven't seen Concrete Table Inheritance as my case's solution. So I'm still confused on how I'm going to achieve what I want. you wouldnt have the location table, and the Location mapper would be mapped directly to the polymorphic union , i.e. mapper(Location, pjoin). --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
[sqlalchemy] Re: table union through ORM
On Tue, May 6, 2008 at 5:36 PM, Eric Lemoine [EMAIL PROTECTED] wrote: Thanks a lot. I'll try that It works great! I would never have found how to do it without support from you Michael. The doc wasn't explicit enough for me to figure it out by myself. But support on the mailing list is awesome as usual. Thanks again, -- Eric --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
