html - Node Mysql not inserting -

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var mysql = require('mysql'); var url = require('url');  var express = require('express'); var http = require('http'); var app = express(); var aluno, disc;  app.get('/', function(req, res){   console.log("aluno: " + req.query.aluno);   console.log("disc: " + request.query.disc);  });  var connection = mysql.createconnection({  host: "localhost",  user: "root",  password: "161616",  database: "matricula" });  connection.connect();  var post = {iddisciplinasmatriculada: aluno*3+disc*2, iddisciplina: disc, idaluno: aluno};  connection.query('insert disciplinasmatriculadas set ?', post, function(err, result) {});

when change few things can run throught cmd receiving args, when receives "/index.js?aluno=2&disc=2" browser, nothing happens @ db.

does know problem might be?

also, here html file i'm using:

<html>     <head>         <title>disciplinasmatriculadas</title>         <script type="text/javascript"></script>     </head>     <body style="font-family: sans-serif">          <fieldset>             <legend>matricula de aluno em disciplina</legend>             id aluno: <input type="text" name="aluno" id="aluno">             <br/>             id disciplina: <input type="text" name="disc" id="disc">             <br/>         <input type="button" value="add" onclick="adddisciplina();">         </fieldset>      <script src="https://code.jquery.com/jquery-1.12.4.js"></script>     <script src="https://code.jquery.com/ui/1.12.0/jquery-ui.js"></script>      <script>     function adddisciplina(){     var alunold = $('#aluno').val();     var discold = $('#disc').val();         $.ajax({         url: "http://localhost:80/node/index.js",         data: { aluno: alunold, disc: discold}         })         .success(function(data){alert('done.');})         .error(function(x,q,h){});     };     </script>     </body> </html>

placeholders can represent values. cannot replace sql keywords, field names, table names, operators etc... values only. query must more like

insert ... set fieldname = ?

while not true, consider placeholder equivalent of string literal. version generating amounts to:

insert ... set 'fieldname=?'

that's not assignment operation. it's string characters f, i, e etc... should string put in record? there's no field assign to, it's syntax error.


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