将托管的应用程序与Node.js和Express链接

Question

i developed an app using reactjs and flux for front and express for the back as a server. everything worked fine. but when i hosted the app tehre is a problem. if more than one user is running the application via its url, the changes apply to all instances. doesn't express allow multi instances?

EDIT: Here is my getMail: it's a function in my server.js

app.get('/api/getmail', function(req, res) {
    try {
        let id = req.param('id');
        var options = { sql: 'SELECT * FROM message WHERE message_owner="' + id + '"', nestTables: true };
        connection.query(options, function(err, result) {
            if (err) throw err;
            res.json(result);
        });
    } catch (error) {
        res.json({ error: error });
    }
});

When the user hits (in the front) getMails, a request is sent with an api i made (the api uses request from superagent/lib/client). The port of my server is specified like so:

app.listen(3002);

Answer 1

So I can tell you that your issue is right here:

let id = req.param('id');

The function req.param has been deprecated in express . Therefore, let id is always equal to null . So what you are saying to your MYSQL server is, "Select all from message where id equals nothing." If you want to get id from the query string you can look at this post . This method is also an option for your situation.