from sqlalchemy import create_engine,Column,String,Integer,ForeignKey,Text
from sql_constant import DB_URI
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker,relationship
engine = create_engine(DB_URI)
Base = declarative_base(engine)
session = sessionmaker(engine)()
class User(Base):
__tablename__ = "user"
id = Column(Integer, primary_key=True, autoincrement=True)
uname = Column(String(50), nullable=False)
def __repr__(self):
return "<User(uname:%s)>" % self.uname
class News(Base):
__tablename__ = "news"
id = Column(Integer, primary_key=True, autoincrement=True)
title = Column(String(50), nullable=False)
content = Column(Text, nullable=False)
uid = Column(Integer, ForeignKey("user.id"))
author = relationship("User", backref="newss")
def __repr__(self):
return "<News(title:%s,content:%s)>" % (self.title, self.content)
# Base.metadata.drop_all()
# Base.metadata.create_all()
user = session.query(User).first()
print(user.newss)
运行出现这种错误 该怎么解决？
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