如何在 NodeJs 中使用会话变量？
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How to use session variable with NodeJs?
提问by John
I have the following NodeJS code:
我有以下 NodeJS 代码：
let sql = `SELECT box_id, cubby_id, occupied, comport
FROM box
WHERE longestDimension = ?
AND LOWER(box_id) = LOWER(?)`;
connection.query(sql, [boxSelectedDimension, boxSelectedValue] , function(err, rows, fields) {
if (!err) {
for(var i=0; i< rows.length; i++) {
// Make the comparaison case insensitive
if (rows[i].occupied == `unoccupied`) {
console.log("free");
var comport = rows[i].comport;
var command = "open" + rows[i].cubby_id;
Essentially i would like to store the value of the comportand commandvariable in a session variable so that the value of these variable could be used in another router page in nodejs.
本质上，我想将comport和command变量的值存储在会话变量中，以便这些变量的值可以在 nodejs 的另一个路由器页面中使用。
I am not sure how to store and retrieve the session variable.
我不确定如何存储和检索会话变量。
回答by Satish Patel
Install express-sessionand use as follows:
安装express-session和使用如下：
var express = require('express');
var session = require('express-session');
var app = express();
app.use(session({secret:'XASDASDA'}));
var ssn ;
app.get('/',function(req,res){
ssn=req.session;
/*
* Here we have assign the 'session' to 'ssn'.
* Now we can create any number of session variable we want.
* Here we do like this.
*/
// YOUR CODE HERE TO GET COMPORT AND COMMAND
ssn.comport;
ssn.command;
});
Following code explain simple login and logout using session. The sessionwe initialize uses secretto store cookies. Hope this helps.
以下代码解释了使用会话的简单登录和注销。在session我们初始化使用secret存储cookies。希望这可以帮助。
var ssn;
app.get('/',function(req,res) {
ssn = req.session;
if(ssn.email) {
res.redirect('/admin');
} else {
res.render('index.html');
}
});
app.post('/login',function(req,res){
ssn = req.session;
ssn.email=req.body.email;
res.end('done');
});
app.get('/admin',function(req,res){
ssn = req.session;
if(ssn.email) {
res.write('<h1>Hello '+ssn.email+'</h1>');
res.end('<a href="+">Logout</a>');
} else {
res.write('<h1>login first.</h1>');
res.end('<a href="+">Login</a>');
}
});
app.get('/logout',function(req,res){
req.session.destroy(function(err) {
if(err) {
console.log(err);
} else {
res.redirect('/');
}
});
});`
