SQLAlchemy Session.add不起作用？

Question

我有使用Python 3.3.0和0.8.0 SQLAlchemy的一個奇怪的錯誤：

from sqlalchemy import create_engine, Integer, String, Text, Column, Sequence, DateTime, ForeignKey 
from sqlalchemy.orm import sessionmaker, relationship, backref 
from sqlalchemy.ext.declarative import declarative_base 

engine = create_engine("sqlite:///:memory:", echo=True) 
Session = sessionmaker(bind = engine) 
Base = declarative_base() 

class Product(Base): 
    __tablename__ = "products" 

    id = Column(Integer, primary_key=True) 
    name = Column(String(200)) 
    description = Column(Text) 

Base.metadata.create_all(engine) 

session = Session() 
product = Product() 
product.id = 1 
product.name = "Test" 
product.description = "Test" 

session.add(product) 
print(product in session) # Expected true 
session.commit() 
print(session.query(Product).all()) # Expected the previous item 

如代碼註釋我期待的add方法使用INSERT將產品添加到數據庫中。但它並沒有也沒有拋出異常。這是日誌：

2013-04-16 18:03:14,368 INFO sqlalchemy.engine.base.Engine PRAGMA table_info("products") 
2013-04-16 18:03:14,369 INFO sqlalchemy.engine.base.Engine() 
2013-04-16 18:03:14,371 INFO sqlalchemy.engine.base.Engine 
CREATE TABLE products (
    id INTEGER NOT NULL, 
    name VARCHAR(200), 
    description TEXT, 
    PRIMARY KEY (id) 
) 


2013-04-16 18:03:14,371 INFO sqlalchemy.engine.base.Engine() 
2013-04-16 18:03:14,371 INFO sqlalchemy.engine.base.Engine COMMIT 
False 
2013-04-16 18:04:04,706 INFO sqlalchemy.engine.base.Engine BEGIN (implicit) 
2013-04-16 18:04:04,708 INFO sqlalchemy.engine.base.Engine SELECT products.id AS products_id, products.name AS products_name, products.description AS products_description 
FROM products 
2013-04-16 18:04:04,709 INFO sqlalchemy.engine.base.Engine() 
[] 

我已經嘗試幾件事情：

• 改變發動機不能正常工作。我也試過postgresql。
• 我試過調試。當我到達add方法的主體時，沒有什麼可以介入的。

我做錯了什麼或者這是一個錯誤？

Answer 1

此問題似乎是Python版本特定的問題。使用Python 3.3.1解決了這個問題。