我正在做一个项目，在一个使用flask和sqlalchemy（托管在awsrds上）连接到mysql服务器的网站上工作，我遵循这个教程，但是当我尝试做（/api/bar）时，我得到了这个错误。当我做我的工作的时候localhost:8080 it 显示“你好世界”非常好。
sqlalchemy.exc.operationalerror:（pymysql.err.operationalerror）（2003，“无法连接到'localhost'（[winerror 10061]无法建立连接，因为目标计算机主动拒绝了它）”）（此错误的背景信息：http://sqlalche.me/e/e3q8)
config.py database\u url=“mysql数据库”+pymysql://username:password@localhost：3306/芭比酒鬼“
这是我的初始密码

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))

数据库.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：所以问题似乎不是我的代码问题，而是windows错误。我尝试的一个解决方案是通过防火墙打开所需的端口，但没有效果。