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javascript - nodeJS中查询和表达的问题

问题描述

我正在为带有nodeJS的服务器使用express开发一个网页。我在注册页面上，并且正在尝试验证用户插入的数据，但是当我进行查询时出现错误。

auth.js

const express = require('express');
const router = express.Router();
const { bd } = require('../database');
const help_functions = require('../lib/common');

router.post('/signup', async (req,res) => {
    const fullname = req.body['fullname'];
    const email = req.body['email'];
    const username = req.body['username'];
    const password = req.body['password'];
    const password_repeat = req.body['password_repeat'];
    var validation_msg = help_functions.validateSignUp(fullname, email, username, password, password_repeat);
    validation_msg = await help_functions.checkRepeatedUserEmail(email);
});

数据库.js

const mysql = require('mysql');
const { promisify } = require('util');

const database =  { // Database credentials }
const bd = mysql.createPool(database);
bd.getConnection((err,connection) => {
    if (err) {
        if (err.code === 'PROTOCOL_CONNECTION_LOST') {
            console.error('Database connection failed !');
        }
        if (err.code === 'ER_CON_COUNT_ERROR') {
            console.error('Database has too many connections !');
        }
        if (err.code === 'ECONNREFUSED') {
            console.error('Database connection was refused !');
        }
    }
    if (connection) {
        connection.release();
        console.log('Database is connected !');
        return;
    }
});
bd.query = promisify(bd.query);
module.exports = bd;

common.js

const { bd } = require('../database');
const helper_functions = {}

helper_functions.validateSignUp = (fullname, email, username, password, password_repeat) => {
    if (fullname === '' || email === '' || username === '' || password === '' || password_repeat === '') {
        return 'All the fields had to be completed!';
    }
    if (!(password.length >= 8 && (/\d/g.test(password) && (/[A-Z]/.test(password)))) ) {
        return 'The password needs to contain at least one capital letter, a number and 8 digits!';
    }
    if(password != password_repeat) {
        return 'Both passwords had to be the same!';
    }
    return 'Validated!';
}
helper_functions.checkRepeatedUserEmail = async (email) => {
    const user = await bd.query('SELECT * FROM users WHERE email = ?', [email]);
    if (user.length) {
        return 'This email is used, please change it!';
    } else {
        return 'Validated!';
    }
}
module.exports = helper_functions;

错误显示下一个文本：

（节点：14616）UnhandledPromiseRejectionWarning：TypeError：无法读取 Object.helper_functions.checkRepeatedUserEmail 中未定义的属性“查询”（proyect_path/src/lib/common.js:19:27）...... ……

（节点：14616）UnhandledPromiseRejectionWarning：未处理的承诺拒绝。此错误源于在没有 catch 块的情况下抛出异步函数内部，或拒绝未使用 .catch() 处理的承诺。要在未处理的 Promise 拒绝时终止节点进程，请使用 CLI 标志--unhandled-rejections=strict （请参阅https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode）。（拒绝 ID：2）（节点：14616）[DEP0018] DeprecationWarning：不推荐使用未处理的承诺拒绝。将来，未处理的 Promise 拒绝将使用非零退出代码终止 Node.js 进程。

有谁知道发生了什么？？谢谢阅读！

标签： javascriptmysqlnode.jsnode-promisify

解决方案

您将数据库公开为默认导出database.js：

module.exports = bd;

但是您正在导入它，就好像它是用名称导出的一样db：

const { bd } = require('../database');

将导出更改database.js为：

module.exports = {
    bd: bd
};

或将其导入common.js文件中：

const bd = require('../database');

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