Oy...this turned out to be due to my own fiddling with the DB outside of sqlalchemy, where I swapped out the user_snapshot table with a copy that had
id int primary key instead of id integer primary key Apparently sqlite treats these differently: sqlite> create table a (a integer primary key, b integer); sqlite> insert into a (b) values (0); sqlite> select * from a; 1|0 sqlite> create table b (a int primary key, b integer); sqlite> insert into b (b) values (0); sqlite> select * from b; |0 I couldn't find in http://www.sqlite.org/autoinc.html or http://www.sqlite.org/datatype3.html any mention of this peculiar distinguishing behavior. Anyway, that's that. On Fri, Nov 18, 2011 at 4:45 PM, Yang Zhang <yanghates...@gmail.com> wrote: > I'm using sqlalchemy 0.6.6 and sqlite 3.6.22 on Python 2.6. When I do: > > In [1]: for i in ses.query(UserSnapshot): > ...: print i > ...: if i is None: break > ...: > > I see: > > ... > <twopt.UserSnapshot object at 0x86a52f50> > <twopt.UserSnapshot object at 0x86a55050> > <twopt.UserSnapshot object at 0x86a55110> > <twopt.UserSnapshot object at 0x86a551d0> > <twopt.UserSnapshot object at 0x86a55290> > <twopt.UserSnapshot object at 0x86a55350> > None > > My schema: > > class User(Base): > __tablename__ = 'user' > id = Column(Integer, primary_key=True) > blob = Column(LargeBinary, nullable=False) > since = Column(DateTime, nullable=False) > > class UserSnapshot(Base): > __tablename__ = 'user_snapshot' > id = Column(Integer, primary_key=True) > uid = Column(Integer, ForeignKey(User.id), nullable=False) > blob = Column(LargeBinary, nullable=False) > time = Column(DateTime, nullable=False) > > Short of dumping my entire DB, any hints as to what might cause `None` > to be returned? I searched the documentation but couldn't find any > leads. Thanks. > > -- > Yang Zhang > http://yz.mit.edu/ > -- Yang Zhang http://yz.mit.edu/ -- 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.
