-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Il 08/11/2012 00:32, Michael Bayer ha scritto: > > On Nov 7, 2012, at 6:18 PM, Manlio Perillo wrote: > >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 > >> Hi. > >> When selecting against joined tables, SQLAlchemy always use the >> "ON join_condition" form. > >> The problem with this is that when the joined columns have the same >> name, they are included 2 times in the result set. > > Only if you select all of those columns. > There's no need to resort to side effects of unusual SQL syntaxes > here, if you're already using the expression language to generate > joins, then you should be specifying those columns you care > about selecting when you call select().
I care about selecting all columns, but without having duplicates. And this is currently not possible, unless I use `use_labels` or manual labels. > Instead of passing "*" to select(), pass the Table object you care > about. The names of the columns should be the least important > thing here - the expression language deals in Table and Column > objects first and foremost. > Maybe I'm missing something: http://paste.org/56806 when executing the output is (SQLAlchemy 0.7.7): 2012-11-08 12:49:29,274 INFO sqlalchemy.engine.base.Engine SELECT foo.id, foo.x, bar.a, bar.id FROM foo JOIN bar ON foo.id = bar.id 2012-11-08 12:49:29,280 INFO sqlalchemy.engine.base.Engine () (u'ID', 777, 0, u'ID') [u'id', u'x', u'a', u'id'] Traceback (most recent call last): File "ambiguous.py", line 41, in <module> print r[0]['ID'] sqlalchemy.exc.InvalidRequestError: Ambiguous column name 'ID' in result set! try 'use_labels' option on select statement. How can I avoid this exception? use_labels is not an option, for me, and manually settings labels in order to avoid ambiguos columns is a bit of nuisance (I'm actually doing this). Thanks Manlio -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAlCbnmQACgkQscQJ24LbaUQcWACfYezfKV3NXDnCFO4VXVBCXvwn Tb4AmwdLa/0XtHxaSWDzl/YamInjKOHF =mLiB -----END PGP SIGNATURE----- -- 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.
