javascript - 我违背了我的 promise

Question

所以.. 我最难学习如何 promise 。

我正在使用 bluebird ( https://github.com/petkaantonov/bluebird ) 正如向我建议的那样——为了驯服我一直在得到的回调 hell 。示例:

function login(req,res,con,mysql,P) {
var ref = undefined;
    con.getConnection(function(err,connection) {
        if (err) console.log("Get Connection Error.. "+err);
        con.query('SELECT password,id FROM player WHERE name='+mysql.escape(req.body.user),function(err,rows,fields) {
            if (err) throw err;
            if (!rows[0]) {
                res.send({
                    "msg":"Your username and or password was incorrect.",
                    "flag":true,
                    "title":": Login Failed"
                });
            }
            if (rows[0].password !== "undefined") {
                if (hash.verify(req.body.pass,rows[0].password)) {
                    req.session.loggedIn = true;
                    req.session.user = rows[0].id;
                    ref = new P(rows[0].id,con,req);
                    res.send({
                        "msg":"You have logged in!",
                        "flag":false,
                        "title":": Logged In"
                    });
                } else {
                    res.send({
                        "msg":"Your username and or password was incorrect.",
                        "flag":true,
                        "title":": Login Failed"
                    });
                }
            }
        });
        connection.release();
    });
    console.log(ref);
    return ref;
}

很恶心，到处都是回调，函数返回ref在查询回调完成执行之前。

解决方案: promise !

我尝试使用快速启动转换我的函数.. 所以我 promisefyAll我的 mysql创建连接之前的模块:

var mysql = require("mysql");
var Promise = require("bluebird");
Promise.promisifyAll(mysql);

我写的函数如下:

function login(req,res,con,mysql,P) {
    var ref = undefined;
    Promise.promisify(con.getConnection)().then(function(connection) { //updated line returns error no method promisify. Bluebird v. 1.1.1
        con.query('SELECT password,id FROM player WHERE name='+mysql.escape(req.body.user)).then(function(rows,fields) {
            if (hash.verify(req.body.pass,rows[0].password)) {
                req.session.loggedIn = true;
                req.session.user = rows[0].id;
                ref = new P(rows[0].id,con,req);
                res.send({
                    "msg":"You have logged in!",
                    "flag":false,
                    "title":": Logged In"
                });
            } else {
                res.send({
                    "msg":"Your username and or password was incorrect.",
                    "flag":true,
                    "title":": Login Failed"
                });
            }
        });
        return ref;
    });
}

但我不断收到 TypeError: Cannot call method 'then' of undefined at Object.login (/var/www/post/posts.js:36:22)

还有

TypeError: undefined is not a function at Pool.<anonymous> (/var/www/node_modules/mysql/lib/Pool.js:53:14)

错误。有人可以帮我理解如何实现查询我的数据库的 promise (正确)吗？

编辑(接受回答后:):这是我调用登录功能的方式:

app.post("/login",function(req,res) {
    Player = post.login(req,res,con,mysql,p);
    console.log(Player); // logs [Object object]
}); //inside the login function, it logs the object like it should

Answer 1

当你 promise 一个原型(prototype)时， promise 返回的方法将有 *Async 后缀

promisification 的想法是假装图书馆的设计初衷就是要返回 promise。您不应在运行时在应用程序代码中调用 promisify，而应在应用程序引导初始化代码或类似代码中调用。

var mysql = require("mysql");
var Promise = require("bluebird");
//Only need to be called once per application so probably not here
Promise.promisifyAll(require("mysql/lib/Connection").prototype);
Promise.promisifyAll(require("mysql/lib/Pool").prototype);

function login(req,res,con,mysql,P) {
    return con.getConnectionAsync().then(function(connection) {
        return connection.queryAsync('SELECT password,id FROM player WHERE name='+
               mysql.escape(req.body.user)).spread(function(rows, fields) {
            if (hash.verify(req.body.pass,rows[0].password)) {
                req.session.loggedIn = true;
                req.session.user = rows[0].id;
                var ref = new P(rows[0].id,con,req);
                res.send({
                    "msg":"You have logged in!",
                    "flag":false,
                    "title":": Logged In"
                });
                return ref;
            } else {
                res.send({
                    "msg":"Your username and or password was incorrect.",
                    "flag":true,
                    "title":": Login Failed"
                });
            }
        }).finally(function() {
            connection.release();
        });
    });
}

---

future 版本将有更好的资源管理，您将能够做到:

function login(req,res,con,mysql,P) {
    return Promise.using(con.getConnectionAsync(), function(connection) {
        return connection.queryAsync('SELECT password,id FROM player WHERE name='+
               mysql.escape(req.body.user));
    }).spread(function(rows, fields) {
        if (hash.verify(req.body.pass,rows[0].password)) {
            req.session.loggedIn = true;
            req.session.user = rows[0].id;
            var ref = new P(rows[0].id,con,req);
            res.send({
                "msg":"You have logged in!",
                "flag":false,
                "title":": Logged In"
            });
            return ref;
        } else {
            res.send({
                "msg":"Your username and or password was incorrect.",
                "flag":true,
                "title":": Login Failed"
            });
        }
    });
}

---

如何使用结果:

app.post("/login",function(req,res) {
    post.login(req,res,con,mysql,p).then(function(Player) {

    }); 
})