[sqlalchemy] Re: ForeignKey schema and Table schema
Sorry, I missed an example in my first message. The problem arises when you try to query across two databases: Session.query(MainUser).join((OtherUser, OtherUser.id == MainUser.id)) Would normally products something like: SELECT * FROM MainUser INNER JOIN OtherUser ON OtherUser.id = MainUser.id When you really need the schema for the table that is in the other database: SELECT * FROM MainUser INNER JOIN other.OtherUser ON OtherUser.id = MainUser.id On May 7, 9:46 am, Michael Bayer mike...@zzzcomputing.com wrote: Aculeus wrote: This has a severe problem having to hard set the schema when that value should be part of configuration. Instead the table should assume the schema of the engine that it's metadata is bound to and automatically appear in queries where there is a table from a different schema than the one the query is being ran through. if your engine() connects using a certain schema as the default schema, then no explicit schema argument is necessary for tables that are accessed by that engine within that schema. schema is only used when accessing a non-default schema from a single engine. --~--~-~--~~~---~--~~ 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 sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: ForeignKey schema and Table schema
Aculeus wrote: Sorry, I missed an example in my first message. The problem arises when you try to query across two databases: Session.query(MainUser).join((OtherUser, OtherUser.id == MainUser.id)) Would normally products something like: SELECT * FROM MainUser INNER JOIN OtherUser ON OtherUser.id = MainUser.id When you really need the schema for the table that is in the other database: SELECT * FROM MainUser INNER JOIN other.OtherUser ON OtherUser.id = MainUser.id If i understand correctly, you'd like a single Table object to dynamically change its schema based on which engine its used with. The only way to achieve something like this is to make a copy of the table against a different schema using table.tometadata(someothermetadata, schema='someschema'). Tables do not assume to be associated with any one engine, so your feature request of the Table automatically setting its schema to the default schema of some particular engine is not possible. If you'd like to achieve this yourself, create a Table function of your own: def Table(*args, **kw): kw['schema'] = someschema return sqlalchemy.schema.Table(*args, **kw) --~--~-~--~~~---~--~~ 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 sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
[sqlalchemy] Re: ForeignKey schema and Table schema
Aculeus wrote: This has a severe problem having to hard set the schema when that value should be part of configuration. Instead the table should assume the schema of the engine that it's metadata is bound to and automatically appear in queries where there is a table from a different schema than the one the query is being ran through. if your engine() connects using a certain schema as the default schema, then no explicit schema argument is necessary for tables that are accessed by that engine within that schema. schema is only used when accessing a non-default schema from a single engine. --~--~-~--~~~---~--~~ 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 sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~--~~~~--~~--~--~---
