用python sqlachemy查询数据库

Question

我在本地有postgresql数据库，正在使用以下python代码对其进行查询。

import os

from sqlalchemy import create_engine
from sqlalchemy.orm import scoped_session, sessionmaker

engine = create_engine(os.getenv("DATABASE_URL"))
db = scoped_session(sessionmaker(bind=engine))


def main():
    flights = db.execute("select origin,destination,duration from flight").fetchall()
    for flight in flights:
        print(f"{flight.origin} to {flight.destination}, is {flight.duration} minutes")


if __name__ == "__main__":
    main()

对于我的情况，我该为 DATABASE_URL 的值做什么？

Answer 1

您需要正确设置数据库URL。对于PostgreSQL，它是：

postgresql//user:password@localhost/database_name