#-*-coding:utf-8-*-
#__author__ = "logan.xu"


import sqlalchemy
from sqlalchemy import create_engine,func
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column,Integer,String,DATE
from sqlalchemy.orm import sessionmaker

engine=create_engine("mysql+pymysql://root:12345678@localhost/news
 
",encoding=‘utf-8‘,echo=True)
Base=declarative_base()

class User(Base):
    __tablename__=‘user‘
    id=Column(Integer,primary_key=True)
    name=Column(String(32))
    password=Column(String(64))

class Student(Base):
    __tablename__=‘student‘
    id=Column(Integer,primary_key=True)
    name=Column(String(32),nullable=False)
    register_date
 
=Column(DATE,nullable=False)
    gender=Column(String(32),nullable=False)

    def __repr__(self):
        return "<%s name:%s>" %(self.id,self.name)

Base.metadata.create_all(engine) #創建表結構

Session_class=sessionmaker(bind=engine)
#創建與數據庫的會話session class，註意，這裏返回給session的是這個class，不是實例
Session=Session_class() #
 
生成session實例


#s1=Student(name="s2",register_date="2019-01-08",gender="F")
s2=Student(name="s1",register_date="2019-01-09",gender="M")
Session.add(s2)



#聯表查詢兩張表join-不帶外鍵關系
print(Session.query(User,Student).filter(User.id==Student.id).all())
Session.commit() #現在才統一提交，創新數據

Python3-sqlalchemy-orm 聯表查詢-無外鍵關系