Thank you for you answer,but I'm sorry,I don't quite follow you.
My confusion is that with the "s.query(User).all()",SA issues SQL stmt the
same as "user_table.select().execute()",but why the latter stmt can return
the row what I expected whereas the former couldn't?
besides,the table in DB change nothing after reflection,just like original
one(no PK there) :
user_table = Table('user', metadata,
Column('id', Integer),
Column('name', Unicode)
)
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