SQLAlchemy的使用---外键ForeignKey数据库创建与连接

# 一对多建表操作
from sqlalchemy.ext.declarative import declarative_base
Base = declarative_base()

from sqlalchemy.orm import relationship
from sqlalchemy import Column, Integer, String, ForeignKey

class Student(Base):
    __tablename__ = 'student'
    id = Column(Integer, primary_key=True)
    name = Column(String(32))
    school_id = Column(Integer, ForeignKey('school.id'))

    stu2sch = relationship('School', backref='sch2stu')
    
class School(Base):
    __tablename__ = 'school'
    id = Column(Integer, primary_key=True)
    name = Column(String(32))

from sqlalchemy import create_engine

engine = create_engine('mysql+pymysql://root:root@127.0.0.1:3306/my_sqlalchemy?charset=utf8')
Base.metadata.create_all(engine)