处理多个POST请求

Question

with EXPRESS.JS i wrote a service to connect my app to a database, this service is basically an endpoint and inside i have multiple GET or POST requests.

now i have to make two different POST request on the same address.

first POST request:

app.post("/accesso", function(req, res) {
  connection.getConnection(function(err, connection) {
    let sql = "DELETE FROM accesso where ?";
    let variabile = { idaccesso: req.body.idaccesso };
    connection.query(sql, variabile, function(error, results) {
      if (error) throw error;
      res.send(results).end();
    });
    connection.release();
  });
});

second POST request:

app.post("/accesso", function(req, res) {
  connection.getConnection(function(err, connection) {
    let sql = "INSERT INTO accesso SET ?";
    let variabile = { utente: req.body.utente };
    connection.query(sql, variabile, function(error, results) {
      if (error) throw error;
      // RISPOSTA DATABASE:
      res.send(results).end();
    });

    connection.release();
  });
});

when i test those requests obviously i can't make the post request, because basically the sql query and the body is different.

is there a way to make multiple POST request on the same TABLE?

Answer 1

Use the next() middleware.

The next middleware function is commonly denoted by a variable named next.

Middleware functions can perform the following tasks:

• Execute any code.
• Make changes to the request and the response objects.
• End the request-response cycle.
• Call the next middleware function in the stack.

So, in your code, change your first post request by including the next parameter and call it once the post is made like this,

app.post("/accesso", function(req, res, next) {
  connection.getConnection(function(err, connection) {
    let sql = "DELETE FROM accesso where ?";
    let variabile = { idaccesso: req.body.idaccesso };
    connection.query(sql, variabile, function(error, results) {
      if (error) throw error;
      res.send(results).end();
    });
    connection.release();
    next();
  });
});

Then place your second post request as is (without any change).

Hope this helps!

Answer 2

As your first request want to delete something from DB, you can define a app.delete method with the same path.

And let the second method be the same as post .

app.delete("/accesso", function(req, res) {
  connection.getConnection(function(err, connection) {
    let sql = "DELETE FROM accesso where ?";
    let variabile = { idaccesso: req.body.idaccesso };
    connection.query(sql, variabile, function(error, results) {
      if (error) throw error;
      res.send(results).end();
    });
    connection.release();
  });
});