rootsmith wrote: > > Just a quick update ... Mac OS X is case preserving but case > insensitive so a query directly within mysql for table "USER" using > "user" will result correctly. So this just deepens the mystery more - > on UNIX either MySQLdb or SQLAlchemy is preserving the case of the > table name as "USER" but on Mac OS X it is not preserving it, which > should work, but whatever routine that underlies the search for the > foreign key in the example I have given is not working.
Not much mystery here; MySQL's casing behavior is platform dependent. Here's some background at: http://dev.mysql.com/doc/refman/5.0/en/identifier-case-sensitivity.html by far the easiest way to deal with this kind of issue is to use all case insensitive identifiers throughout your database. In SQLAlchemy, specifying a name as all lower case (i.e. "users") indicates case insensitive treatment, where no quoting will be applied. > > On Oct 1, 10:27 pm, rootsmith <ke...@rootsmith.ca> wrote: >> Previously I was doing development of a project on an Ubuntu 9.04 >> machine with MySQL 5.0 and just recently switched to doing development >> on a MacBook Pro. I installed identical versions of MySQL on the >> MacBook. I used the exact same source files and installed the same >> versions of all libraries for the project, however, when I try to >> initialize the model on the MacBook I get the following stack trace: >> >> File "/Users/kevin/mydevenv/lib/python2.6/site-packages/ >> SQLAlchemy-0.5.6-py2.6.egg/sqlalchemy/orm/__init__.py", line 751, in >> mapper >> return Mapper(class_, local_table, *args, **params) >> File "/Users/kevin/mydevenv/lib/python2.6/site-packages/ >> SQLAlchemy-0.5.6-py2.6.egg/sqlalchemy/orm/mapper.py", line 194, in >> __init__ >> self._configure_inheritance() >> File "/Users/kevin/mydevenv/lib/python2.6/site-packages/ >> SQLAlchemy-0.5.6-py2.6.egg/sqlalchemy/orm/mapper.py", line 239, in >> _configure_inheritance >> self.inherit_condition = sqlutil.join_condition >> (self.inherits.local_table, self.local_table) >> File "/Users/kevin/mydevenv/lib/python2.6/site-packages/ >> SQLAlchemy-0.5.6-py2.6.egg/sqlalchemy/sql/util.py", line 135, in >> join_condition >> "between '%s' and '%s'" % (a.description, b.description)) >> sqlalchemy.exc.ArgumentError: Can't find any foreign key relationships >> between 'USER' and 'MANAGER' >> >> This is despite the fact that there is a foreign relation between the >> two as follows on the MANAGER table: >> >> CONSTRAINT FK_MANAGER_USER FOREIGN KEY (user_id) >> REFERENCES `USER`(user_id) >> >> I have traced the problem so far to the fact that on Ubuntu, the >> ForeignKey in SQLAlchemy is built as ForeignKey(u'USER.user_id') and >> on the Mac it is ForeignKey(u'user.user_id'). This has been confirmed >> by tracing the code into sql.util.join_condition where the call >> fk.get_referant() is being made. >> >> Note again, this is the EXACT SAME code running on both machines. I >> don't know if it is a MySQL setting (unlikely), MySQLdb, or SQLAlchemy >> that is causing the incorrect case issue on the table name. Does >> anyone know off hand what might be going on here? >> >> Just to confirm, the table in the database is called "USER" and >> therefore any search for "user" will not yield any results. > > > --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
