Sqlalchemy automap Demo

发表于 | 分类于 | 
1
2
3
from sqlalchemy import create_engine, Table, Column, Integer, String, MetaData, ForeignKey
from sqlalchemy.orm import Session
from sqlalchemy.ext.automap import automap_base
1
2
3
4
5
6
if __name__ == '__main__':
    engine_str = "mysql+pymysql://user:password@host:port/employees?charset=utf8mb4"
    engine = create_engine(engine_str, echo=True)
    session = Session(engine)
    Base = automap_base()
    Base.prepare(engine, reflect=True)
1
2
3
4
# 查询测试
result = session.query(Base.classes.user).all()
for i in result:
    print(i.id)
1
2
3
4
5
6
7
8
9
10
11
12
# orm 映射
User = Base.classes.user
Customers = Base.classes.Customers
Orders = Base.classes.Orders
 
result = session.query(Customers, Orders).filter_by(cust_id=1000000001).first()
# print(result)
for i in result:
    if isinstance(i, Customers):
        print(i.cust_name)
    if isinstance(i, Orders):
        print(i.order_date)