1 #!/usr/bin/env python
2 import sqlalchemy
3 from sqlalchemy import create_engine
4 from sqlalchemy.ext.declarative import declarative_base
5 from sqlalchemy import Column, Integer, String,ForeignKey
6 from sqlalchemy.orm import sessionmaker,relationship
7 print(sqlalchemy.__version__)
8
9 engine = create_engine('mysql+pymysql://root:taochen123@127.0.0.1:3306/a1',echo = True)
10
11 Base = declarative_base(engine)
12
13 class Father(Base):
14 __tablename__ = "father"
15
16 id = Column(Integer,autoincrement=True,primary_key=True)
17 name = Column(String(20))
18 son = relationship('Father')
19 def __repr__(self):
20 return self.name
21
22 class Son(Base):
23 __tablename__ = 'son'
24 id = Column(Integer,autoincrement=True,primary_key=True)
25 name = Column(String(20))
26 email = Column(String(20))
27 father_id = Column(Integer,ForeignKey('father.id'))
28 Base.metadata.create_all(engine)
29
30 Session = sessionmaker(bind=engine)
31 session = Session()
32 # f1 = Father(name = "fafafa")
33 # session.add(f1)
34 # s1 = Son(name = 'sq',email = '@qq.com',father_id = 1)
35 # s2 = Son(name = 'sw', email= 'q@qq.com',father_id= 1)
36 # session.add_all([s1,s2])
37
38
39 ret = session.query(Father.name,Son.name).join(Son).first()
40 print("ret=",ret)
41 session.commit()
