Nodejs 表达并承诺不会做我期望的事情

问题描述

我正在尝试使用 NodeJS 构建登录 API，但我的代码没有按照我的预期运行.我对 js、promise 和所有内容都很陌生，因此请尽可能简化任何答案.

I am trying to build a login API using NodeJS, but my code is not doing what I expect it to. I am very new to js, promises and all so please simplify any answer if possible.

从我在代码输出中看到的，第一个 promise 部分不会等到函数 findUsers(...) 完成.

From what I can see in the output of my code, the first promise part does not wait until the function findUsers(...) is finished.

我有一个路由文件，我想在其中按顺序运行一些函数:

I have a routes file where I want to run a few functions sequentially:

1. 查找数据库中是否存在用户
2. if(1 is true) 对输入的密码进行哈希和加盐
3. ...等

路由文件现在包含:

var loginM = require('../models/login');
var loginC = require('../controllers/login');
var Promise = require('promise');

module.exports = function(app) {

    app.post('/login/', function(req, res, next) {

        var promise = new Promise(function (resolve, reject) {
            var rows = loginM.findUser(req.body, res);

            if (rows.length > 0) {
                console.log("Success");
                resolve(rows);
            } else {
                console.log("Failed");
                reject(reason);
            }
        });

        promise.then(function(data) {
            return new Promise(function (resolve, reject) {
                loginC.doSomething(data);

                if (success) {
                    console.log("Success 2");
                    resolve(data);
                } else {
                    console.log("Failed 2");
                    reject(reason);
                }
            });
        }, function (reason) {
            console.log("error handler second");
        });
    });
}

findUser 函数包含池化和查询，并位于模型文件中:

And the findUser function contains pooling and a query and is in a models file:

var connection = require('../dbConnection');
var loginC = require('../controllers/login');

function Login() {
    var me = this;
    var pool = connection.getPool();

    me.findUser = function(params, res) {
        var username = params.username;

        pool.getConnection(function (err, connection) {
            console.log("Connection ");

            if (err) {
                console.log("ERROR 1 ");
                res.send({"code": 100, "status": "Error in connection database"});
                return;
            }

            connection.query('select Id, Name, Password from Users ' +
                'where Users.Name = ?', [username], function (err, rows) {
                connection.release();
                if (!err) {
                    return rows;
                } else {
                    return false;
                }
            });

            //connection.on('error', function (err) {
            //    res.send({"code": 100, "status": "Error in connection database"});
            //    return;
            /