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javascript - JS 无法查询 MySQL 数据库。错误：connection.query 不是函数

问题描述

试图查询我的 mySQL 数据库，但我不能，因为我得到一个TypeError: connection.query is not a function错误。有谁知道为什么？我不知道为什么会这样。

数据库.js

const fs = require('fs'); // node.js file system module
require('dotenv').config(); // stores tokens, keys, passwords and other info
const Discord = require('discord.js'); // links discord.js api to file
const database = require('./database.js');

const client = new Discord.Client(); // creates bot user

let connection;
(async () => {
    connection = await require('./database.js');
    await client.login(process.env.TOKEN); // bot goes from offline to online
})();

client.once('ready', () => console.info(`[${date.toLocaleString()}] INFO | Ready, logged in as ${client.user.tag} (${client.user.id})\n------------------------`));

client.on('guildCreate', async guild => {
    try {
        await connection.query(`INSERT INTO guildInfo VALUES('${guild.id}', '${guild.ownerID}')`);
        await connection.query(`INSERT INTO guildConfig (guildID) VALUES('${guild.id}')`);
    } catch(err) {
        console.error(err);
    }
});

数据库.js

require('dotenv').config();
const mysql = require('mysql2/promise');

date = new Date();
mysql.createConnection({
    user: process.env.USER,
    password: process.env.PASSWORD,
    database: process.env.DATABASE
}).then(connection => console.info(`[${date.toLocaleString()}] INFO | Waiting for input/changes to code\n------------------------`)).catch(err => console.error(err));

错误

TypeError: connection.query is not a function
    at Client.<anonymous> (C:\Users\Patrick Lawrence\Desktop\Synth\index.js:43:20)
    at Client.emit (events.js:315:20)
    at Object.module.exports [as GUILD_CREATE] (C:\Users\Patrick Lawrence\Desktop\Synth\node_modules\discord.js\src\client\websocket\handlers\GUILD_CREATE.js:33:14)
    at WebSocketManager.handlePacket (C:\Users\Patrick Lawrence\Desktop\Synth\node_modules\discord.js\src\client\websocket\WebSocketManager.js:384:31)
    at WebSocketShard.onPacket (C:\Users\Patrick Lawrence\Desktop\Synth\node_modules\discord.js\src\client\websocket\WebSocketShard.js:444:22)
    at WebSocketShard.onMessage (C:\Users\Patrick Lawrence\Desktop\Synth\node_modules\discord.js\src\client\websocket\WebSocketShard.js:301:10)
    at WebSocket.onMessage (C:\Users\Patrick Lawrence\Desktop\Synth\node_modules\ws\lib\event-target.js:125:16)
    at WebSocket.emit (events.js:315:20)
    at Receiver.receiverOnMessage (C:\Users\Patrick Lawrence\Desktop\Synth\node_modules\ws\lib\websocket.js:797:20)
    at Receiver.emit (events.js:315:20)

标签： javascriptmysqlnode.jsdiscord.js

解决方案

只需您不将连接导出到database.js.

创建连接后，将其分配给一个变量，例如const connection并在文件底部键入module.exports = connection。

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