使用Node.js TCP服务器接收客户端数据

Question

我想从正在向服务器发送数据的客户端接收数据。 这是我的代码，将传入的数据插入到msql中

var net = require('net');
var mysql = require('mysql');
var randomstring = require("randomstring");

var server = net.createServer(function(socket) {
    socket.write('Echo server\r\n');
    socket.pipe(socket);
});
 socket.on('data', function (data) {

var connection = mysql.createConnection({
  host     : 'seizedserver.com',
  user     : 'federal',
  password : '123456',
  database : 'hanging_tree'
});

connection.connect();
/*
connection.query('SELECT data from gps', function(err, rows) {
  if (err) throw err;

  console.log('The solution is: ', rows[0]);
});
*/
var post  = {data: data};
var query = connection.query('INSERT INTO gps SET ?', post, function(err, result) {
});
console.log(query.sql); 

connection.end();
  });
server.listen(1337, '127.0.0.1');

计划是将传入的数据插入到我创建的mysql表中，但是我不确定我是否正确使用了data事件。

我是否正确使用数据事件？

当我永远运行脚本时出现此错误

/var/www/html/server.js:9
 socket.on('data', function (data) {
 ^
ReferenceError: socket is not defined
    at Object.<anonymous> (/var/www/html/server.js:9:2)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
    at node.js:902:3
error: Forever detected script exited with code: 8

Answer 1

socket仅在服务器的回调中定义：

var server = net.createServer(function(socket) {
    socket.write('Echo server\r\n');
    socket.pipe(socket);
});

 // socket is undefined here
 socket.on('data', function (data) {

var connection = mysql.createConnection({
  host     : 'seizedserver.com',
  user     : 'federal',
  password : '123456',
  database : 'hanging_tree'
});

应该：

var server = net.createServer(function(socket) {
    socket.write('Echo server\r\n');

    // socket is defined here and in scope
    socket.on('data', function (data) {

    var connection = mysql.createConnection({
      host     : 'seizedserver.com',
      user     : 'federal',
      password : '123456',
      database : 'hanging_tree'
    });

    socket.pipe(socket);
});