无法连接到主机上的 MySQL 服务器

Question

我使用 pYMYSQL 连接数据库并使用 buildozer 部署在 android 设备上。 无法连接到“freedb.tech”上的 MySQL 服务器 错误

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05-14 17:15:20.090 4020 4058 org.test.myapp 我 python 出了问题 错误：（2003，“无法连接到‘freedb.tech’上的 MySQL 服务器（[Errno 7] 没有与主机名关联的地址)")

python 文件

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.animation import Animation
from hoverable import HoverBehavior
from kivy.uix.image import Image
from kivy.uix.behaviors import ButtonBehavior
import json, glob
from datetime import datetime
from pathlib import Path
import random
import pymysql.cursors

db_string = "postgresql://[user]:[password]@ec2-54-197-100-79.compute-1.amazonaws.com:5432/d4bsdrtg9i2j5d"
Builder.load_file('design.kv')


class LoginScreen(Screen):
    def sign_up(self):
        self.manager.current = "sign_up_screen"

    def login(self, uname, pword):
        with open("users.json") as file:
            users = json.load(file)
        if uname in users and users[uname]['password'] == pword:
            self.manager.current = 'login_screeen_success'
        else:
            anim = Animation(color=(0.6, 0.7, 0.1, 1))
            anim.start(self.ids.login_wrong)
            self.ids.login_wrong.text = "Wrong username or password!"


class RootWidget(ScreenManager):
    pass


class SignUpScreen(Screen):
    def add_user(self, uname, pword):
        with open("users.json") as file:
            users = json.load(file)

        users[uname] = {'username': uname, 'password': pword,
                        'created': datetime.now().strftime("%Y-%m-%d %H-%M-%S")}

        with open("users.json", 'w') as file:
            json.dump(users, file)

        self.manager.current = "sign_up_screen_success"


class SignUpScreenSuccess(Screen):
    def go_to_login(self):
        self.manager.transition.direction = 'right'
        self.manager.current = "login_screen"


class LoginScreenSuccess(Screen):
    def log_out(self):
        self.manager.transition.direction = "right"
        self.manager.current = "login_screen"

    def get_quote(self, feel):
        feel = feel.lower()
        available_feelings = glob.glob("quotes/*txt")

        available_feelings = [Path(filename).stem for filename in
                              available_feelings]

        if feel in available_feelings:
            with open(f"quotes/{feel}.txt", encoding='utf8') as file:
                quotes = file.readlines()
            self.ids.quote.text = random.choice(quotes)
        else:
            self.ids.quote.text = "Try another feeling"

    def feed_back(self):
        self.manager.current = "feedback_screen"


class ImageButton(ButtonBehavior, HoverBehavior, Image):
    pass


class FeedbackScreen(Screen):
    def send_feed(self, feed):
        print(feed)
        # connection = psycopg2.connect(user="[user]",
        #                               password="[password]",
        #                               host="ec2-54-197-100-79.compute-1.amazonaws.com",
        #                               port="5432",
        #                               database="d4bsdrtg9i2j5d")
        # db = create_engine(db_string)
        #
        # postgres_insert_query = """INSERT INTO feed(feed_info) VALUES (%s)"""
        #
        # db.execute(postgres_insert_query, feed)
        # print("Record inserted successfully into feed table")
        try:

            mydb = pymysql.connect(
                host="freedb.tech",
                user="freedbtech_reds",
                password="Raskol@786",
                database="freedbtech_redsdb"
            )

            mycursor = mydb.cursor()

            sql = "INSERT INTO feed (feed_info) VALUES (%s)"
            val = (feed,)
            mycursor.execute(sql, val)
            mydb.commit()
            print(mycursor.rowcount, "Record inserted successfully into feed table")

            self.manager.current = 'login_screen'
        except pymysql.Error as err:
            print("Something went wrong: {}".format(err))


class MainApp(App):
    def build(self):
        return RootWidget()


if __name__ == "__main__":
    MainApp().run()


---------------------------------
buildozer spec
--------------------------------
requirements = python3,kivy,PyMySQL

Answer 1

您说这些凭据是正确的，但您仍然无法连接到数据库 这是一个简单的问题 注意：-

如果您无法访问互联网，也会出现此错误

所以要访问互联网你必须在你的 buildozer.spec 文件中添加android.permissions = INTERNET

快乐编码 (^_^)