無法在NodeJs中保存快速會話

Question

我試圖在快速會話中保存用戶的用戶名。它在會話中保存變量，但在下一次路由請求時返回undefined。但是，問題僅限於POST路由。

使用GET請求，我可以保存會話變量，並且不會在進一步的請求中被銷燬。我想我一定在做錯事。我嘗試使用save()方法進行POST，但仍然只能保存第一次和下次它消失。

下面的代碼：

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

以下get線工程。

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'); 
    } 
    } 
}); 

以下路線僅保存會話一次。

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(); 
     }); 

     } 
    }); 
}); 

我做錯了什麼？

Answer 1

既然是Javascript你應該檢查質量===代替==和更好的響應時間釋放連接，然後再連接到它，簡直是不必要的，當你有connectionPool的連接距離它查詢兩次，然後釋放連接。

下面是示例修改app.post()..要求，這應該工作：

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(); 
     } 
    }); 
});