无法在 NodeJs 中保存快速会话

Question

我正在尝试在Express会话中保存用户的用户名。它将变量保存在会话中，但它将下一个请求的undefined返回到路由。但是，问题仅在邮局中。

有了获取请求，我可以保存会话变量，并且不会在进一步的请求中被破坏。我想我一定做错了。我尝试了save()的邮政方法，但仍然只节省了第一次，下次它消失了。

这是代码：

app.use(session({
  secret: 'some secret',
  resave: true,
  saveUninitialized: true,
  cookie: {
    maxAge: 36000000,
    httpOnly: false
  },
}));

以下获取路线可行。

app.get("/test", function(req, res, next){
    if(!req.session.name){
        req.session.name = "vikas kumar";
    } else {
        console.log(req.session.name);
    }
    res.end();
});
app.use(function (req, res, next) {
  var userName = req.session.userName;
  // console.log(req.session.userName);
  if(userName && userName != 'undefined'){
    res.send({status: "success", value: userName});
  } else {
    if(req.path == '/checkIfLoggedIn'){
        res.send({status: "error", message: "Session ended."});
    } else {
        next('route');
    }
  }
});

以下路由仅保存一次会话。

app.post('/getProfile', function (req, res, next) {
    console.log("Session", req.session.userName, req.session.name);
    if(typeof req.session.userName != 'undefined'){
        var userName = req.session.userName;
    } else {
        var userName = req.body.userName;
    }
   connectionPool.getConnection(function (err, connection) {
        if (err) {
            res.send({status: "error", message: err});
        } else {
        connection.query("SELECT * FROM cs_chat.users WHERE username=?", [userName], function (err, rows, fields) {
            if(rows.length==1){
                // console.log(">>>", req.session.userName);
                req.session.userName = userName;
                req.session.save();
                // console.log("<<<", req.session.userName);
                next();
            }else{
                res.send({status: "error", message: "Sorry, you're not registered."});
            }
            connection.release();
        });
        }
    });
}, function (req, res) {
    connectionPool.getConnection(function (err, connection) {
        if (err) {
            res.send({status: "error", message: err});
        } else {
            req.session.username = req.body.userName;
            req.session.save();
        connection.query("SELECT usr.username, usr.name, tsn.sender, CASE WHEN tsn.unseen is not null THEN tsn.unseen ELSE 0 END as unseen, tsn.receiver FROM users usr LEFT JOIN (SELECT sender, receiver, SUM(CASE WHEN seen = 0 THEN 1 ELSE 0 END) AS unseen FROM messages WHERE receiver = ? GROUP BY sender , receiver) tsn ON usr.username = tsn.sender where usr.username!=?", [req.body.userName, req.body.userName], function (err, rows, fields) {
            if(rows.length>0){
                res.send({status: "success", values: rows});
            }else{
                res.send({status: "success", values: []});
            }
            connection.release();
        });
        }
    });
});

我做错了什么？

Answer 1

，因为它是 Javascript，您应该使用===而不是==检查质量，并且为了更好地响应时间发布连接，然后再连接到它，这是不必要的，当您具有连接到连接到connectionPool只需从中查询两次，然后发布连接即可。

这是示例修改的app.post()..请求，这应该有效：

    app.post('/getProfile', function (req, res, next) {
    console.log("Session", req.session.userName, req.session.name);
    var userName = (req.session.userName !== undefined) ? req.session.userName : req.body.userName;
    connectionPool.getConnection(function (err, connection) {
        if (err) {
            res.send({ status: "error", message: err });
        } else {
            connection.query("SELECT * FROM cs_chat.users WHERE username=?", [userName], function (err, rows, fields) {
                if (rows.length === 1) {
                    req.session.userName = userName;
                    req.session.save();
                } else {
                    res.send({ status: "error", message: "Sorry, you're not registered." });
                }
            });
            connection.query("SELECT usr.username, usr.name, tsn.sender, CASE WHEN tsn.unseen is not null THEN tsn.unseen ELSE 0 END as unseen, tsn.receiver FROM users usr LEFT JOIN (SELECT sender, receiver, SUM(CASE WHEN seen = 0 THEN 1 ELSE 0 END) AS unseen FROM messages WHERE receiver = ? GROUP BY sender , receiver) tsn ON usr.username = tsn.sender where usr.username!=?",
                [req.body.userName, req.body.userName],
                function (err, rows, fields) {
                    if (rows.length > 0) {
                        res.send({ status: "success", values: rows });
                    } else {
                        res.send({ status: "success", values: [] });
                    }
                });
            connection.release();
        }
    });
});