PYTHON開源專案及示例程式碼
阿新 • • 發佈：2019-01-10
# 通過物件的方式建立兩張依賴關係的表
from sqlalchemy import *
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import relation, sessionmaker
Base = declarative_base()
class Movie(Base) :
__tablename__ = 'movies'
id = Column(Integer, primary_key=True)
title = Column(String(255), nullable=False)
year = Column(Integer)
directed_by = Column(Integer, ForeignKey('directors.id'))
director = relation('Director', backref='movies', lazy=False)
def __init__(self, title=None, year=None) :
self.title = title
self.year = year
def __repr__(self) :
return 'Movie(%r, %r, %r)' % (self.title, self.year, self.director)
class Director(Base) :
__tablename__ = 'directors'
id = Column(Integer, primary_key=True)
name = Column(String(50), nullable=False, unique=True)
def __init__(self, name=None) :
self.name = name
def __repr__(self) :
return 'Director(%r)' % (self.name)
Base.metadata.create_all(create_engine('dbms://user: