#!/usr/bin/python
# -*- coding: UTF-8 -*-
from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()
class Test(Base):
__tablename__ = 'test'
tid = Column(Integer)
engine = create_engine('sqlite:///:memory:', echo=True)
metadata = Base.metadata
metadata.create_all(engine)
==========================================================
When i run it:
Traceback (most recent call last):
File "D:\z_CaiJi_\z6.py", line 10, in <module>
class Test(Base):
File "c:\python25\lib\site-packages\SQLAlchemy-0.5.8-py2.5.egg
\sqlalchemy\ext\declarative.py", line 561, in __init__
_as_declarative(cls, classname, dict_)
File "c:\python25\lib\site-packages\SQLAlchemy-0.5.8-py2.5.egg
\sqlalchemy\ext\declarative.py", line 554, in _as_declarative
cls.__mapper__ = mapper_cls(cls, table, properties=our_stuff,
**mapper_args)
File "c:\python25\lib\site-packages\SQLAlchemy-0.5.8-py2.5.egg
\sqlalchemy\orm\__init__.py", line 751, in mapper
return Mapper(class_, local_table, *args, **params)
File "c:\python25\lib\site-packages\SQLAlchemy-0.5.8-py2.5.egg
\sqlalchemy\orm\mapper.py", line 199, in __init__
self._configure_pks()
File "c:\python25\lib\site-packages\SQLAlchemy-0.5.8-py2.5.egg
\sqlalchemy\orm\mapper.py", line 440, in _configure_pks
"key columns for mapped table '%s'" % (self,
self.mapped_table.description))
sqlalchemy.exc.ArgumentError: Mapper Mapper|Test|test could not
assemble any primary key columns for mapped table 'test'
It seems must make a primary_key for table，but my table need't
primary_key，what can i do？
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