py2

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

MYSQL_URI = 'mysql+mysqldb://root:111111@127.0.0.1:3306/blog?charset=utf8'

Base = declarative_base()     #table的基类

class User(Base):     #创建表的orm框架
    __tablename__ = 'user'
    id = Column(String(20), primary_key=True)
    name = Column(String(20))
Base.metadata.create_all(engine)    #生成表

#CRUD
engine = create_engine(MYSQL_URI)    #连接数据库
DBSession = sessionmaker(bind=engine)    #创建会话
user = session.query(User).filter_by(name="user1").first()