为什么行未定义？

Question

使用 Passport(Local-Signup) 创建用户注册功能，代码如下：

// config/passport.js

// load all the things we need
var LocalStrategy   = require('passport-local').Strategy;

// load up the user model
var mysql = require('mysql');
var bcrypt = require('bcrypt-nodejs');
var dbconfig = require('./database');
var connection = mysql.createConnection(dbconfig.connection);

connection.query('USE ' + dbconfig.database);
// expose this function to our app using module.exports
module.exports = function(passport) {


    passport.serializeUser(function(user, done) {
        done(null, user.id);
    });

    // used to deserialize the user
    passport.deserializeUser(function(id, done) {
        connection.query("SELECT * FROM users WHERE id = ? ",[id], function(err, rows){
            done(err, rows[0]);
        });
    });


    passport.use(
        'local-signup',
        new LocalStrategy({
            // by default, local strategy uses username and password, we will override with email
            usernameField : 'username',
            passwordField : 'password',
            passReqToCallback : true // allows us to pass back the entire request to the callback
        },
        function(req, username, password, done) {
            // find a user whose email is the same as the forms email
            // we are checking to see if the user trying to login already exists
            connection.query("SELECT * FROM users WHERE username = ?",[username], function(err, rows) {
                if (err)
                    return done(err);
                if (rows.length) {
                    return done(null, false, req.flash('signupMessage', 'That username is already taken.'));
                } else {
                    // if there is no user with that username
                    // create the user
                    var newUserMysql = {
                        username: username,
                        password: bcrypt.hashSync(password, null, null)  // use the generateHash function in our user model
                    };

                    var insertQuery = "INSERT INTO users ( username, password ) values (?,?)";

                    connection.query(insertQuery,[newUserMysql.username, newUserMysql.password],function(err, rows) {
                        newUserMysql.id = rows.insertId;

                        return done(null, newUserMysql);
                    });
                }
            });
        })
    );

抛出以下错误：

TypeError：无法读取未定义的属性“id” 在 Query._callback (M:\server\config\passport.js:70:55) 在 Query.Sequence.end (M:\server\node_modules\mysql\lib\protocol\sequences\Sequence.js:88:24) 在 Query.ErrorPacket (M:\server\node_modules\mysql\lib\protocol\sequences\Query.js:90:8) 在 Protocol._parsePacket (M:\server\node_modules\mysql\lib\protocol\Protocol.js:279:23) 在 Parser.write (M:\server\node_modules\mysql\lib\protocol\Parser.js:76:12) 在 Protocol.write (M:\server\node_modules\mysql\lib\protocol\Protocol.js:39:16) 在套接字。 (M:\server\node_modules\mysql\lib\Connection.js:103:28) 在 emitOne (events.js:116:13) 在 Socket.emit (events.js:211:7) 在 addChunk (_stream_readable.js:263:12) 在 readableAddChunk (_stream_readable.js:250:11) 在 Socket.Readable.push (_stream_readable.js:208:10) 在 TCP.onread (net.js:594:20)

使用console.log(rows); 返回undefined。我该如何解决这个问题？

[编辑] 考虑到答案后，产生了以下错误（因为rows.insertId 仍然未定义）：

错误：无法将用户序列化到会话中 通过 (M:\server\node_modules\passport\lib\authenticator.js:281:19) 在序列化 (M:\server\node_modules\passport\lib\authenticator.js:286:7) 在 M:\server\config\passport.js:24:9 通过 (M:\server\node_modules\passport\lib\authenticator.js:294:9) 在 Authenticator.serializeUser (M:\server\node_modules\passport\lib\authenticator.js:299:5) 在 SessionManager.logIn (M:\server\node_modules\passport\lib\sessionmanager.js:14:8) 在 IncomingMessage.req.login.req.logIn (M:\server\node_modules\passport\lib\http\request.js:50:33) 在 Strategy.strategy.success (M:\server\node_modules\passport\lib\middleware\authenticate.js:248:13) 在已验证 (M:\server\node_modules\passport-local\lib\strategy.js:83:10)

Answer 1

据我了解，与MySQL无关

您共享的 JSON 没有 id

var newUserMysql = {用户名：用户名，密码：密码}；

然而，您正在尝试访问 id，这就是原因，您得到了 undefined

newUserMysql.id = rows.insertId;

要解决此问题，您需要将id 添加到您的 JSON 中。

var newUserMysql = {username: "username", password : "password", id:""};

Answer 2

答案一直在我的眼皮底下。我所要做的就是改变这一点：

newUserMysql = rows.insertId;

进入这个：

newUserMysql = rows[0].insertId;

问题已成功解决。