Question

我正在一个项目上工作，该项目可以在使用flask和sqlAlchemy（托管在AWS RDS上）连接到mysql服务器的网站上工作，我正在遵循此tutorial，但是当我尝试这样做时（/ api /酒吧）我得到这个错误。当我刚执行localhost：8080时，它会很好地显示“ Hello World”。

sqlalchemy.exc.OperationalError：（pymysql.err.OperationalError）（2003，“无法连接到'localhost'上的MySQL服务器（[WinError 10061]无法建立连接，因为目标计算机主动拒绝了它）” ）（此错误的背景位于http://sqlalche.me/e/e3q8）

config.py database_url =“ mysql + pymysql：// username：密码@localhost：3306 / barbeerdrinker”

这是我的 __ init __ .py

from flask import Flask
from flask import jsonify
from flask import make_response
from flask import request
import json

from barbeerdrinker import database

#Flask application
app = Flask(__name__)

@app.route("/")
def hello_world():
    return "Hello World"

@app.route("/api/bar", methods=["GET"])
def get_bars():
    return jsonify(database.get_bars())

@app.route("/api/bar/<name>", methods=["GETS"])
def find_bar(name):
    try:
        if name is None:
            raise ValueError("Bar is not specified")
        bar = database.find_bar(name)
        if bar is None:
            return make_response("No bar found within given name", 404)
        return jsonify(bar)
    except ValueError as e:
        return make_response(str(e), 400)
    except Exception as e:
        return make_response(str(e), 500) 

@app.route("/api/beers_cheaper_than", methods=["POST"])
def find_beers_cheaper_than():
    body = json.loads(request.data)
    max_price = body['maxPrice']
    return jsonify(database.filter_beers(max_price))

database.py

from sqlalchemy import create_engine
from sqlalchemy import sql

from barbeerdrinker import config

engine = create_engine(config.database_url)

def get_bars():
    with engine.connect() as con:
        rs = con.execute("SELECT name, address, city, opening, closing, phoneNum FROM bars")
        return [dict(row) for row in rs]

def find_bar(name):
    with engine.connect() as con:
        query = sql.text("SELECT * FROM bars WHERE name = :name;")
        rs = con.execute(query, name=name)
        result = rs.first()
        if result is None:
            return None
        return dict(result)

def filter_beers(max_price):
    with engine.connect() as con:
        query = sql.text("SELECT * FROM sells WHERE price < : max_price;")
        rs = con.execute(query, max_price=max_price)
        results = [dict(row) for row in rs]
        for r in results:
            r['price'] = float(r['price'])
        return results

**编辑：所以看来问题不是我的代码有问题，而是Windows错误。我尝试做的一种解决方案是通过防火墙打开所需的端口，无济于事。

Answer 1

我刚刚弄清楚了，原来问题不是Windows问题。问题出在我的config.py内：

代替： database_url = "mysql+pymysql://username:password@localhost:3306/barbeerdrinker"

应为： database_url = "mysql+pymysql://username:password@**AWSENDPOINT/HOSTNAME**:3306/barbeerdrinker"

使用sqlAlchemy在我的数据库上执行SQL查询时出现问题

1 个答案: