尝试查询我的 mySQL 数据库，但我不能，因为我得到了TypeError: connection.query is not a function错误。有谁知道为什么吗？我不知道为什么会发生这种情况。
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));
Error
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)
只是你不导出连接database.js.
创建连接后，将其分配给变量，例如const connection并在文件底部键入module.exports = connection.
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