如何从NodeJsServer的查询字符串中获取id或任何变量数据

我已经设置了一个节点Js服务器。现在我正在从数据库中获取所有用户的记录。

现在，如果我想要一个具有特定Id的特定用户，我如何将其传递给Node Js？

例如：我们在PHP中执行：$_GET['id']；我在NodeJS中也想要同样的东西

这是我的服务器代码：

var app                 = require('http').createServer(),
    io                  = require('socket.io').listen(app),
    fs                  = require('fs'),
    mysql               = require('mysql'),
    connectionsArray    = [],
    connection          = mysql.createConnection({
        host        : 'localhost',
        user        : 'root',
        password    : '',
        database    : 'test',
        port        : 3306
    }),
    POLLING_INTERVAL = 1000,
    pollingTimer;
// If there is an error connecting to the database
connection.connect(function(err) {
  // connected! (unless `err` is set)
  console.log( err );
});
// creating the server ( localhost:8000 )
app.listen(8000);

/*
*
* HERE IT IS THE COOL PART
* This function loops on itself since there are sockets connected to the page
* sending the result of the database query after a constant interval
*
*/
var pollingLoop = function () {
    // Doing the database query
    var query = connection.query('SELECT * FROM users'),
        users = []; // this array will contain the result of our db query
    // setting the query listeners
    query
    .on('error', function(err) {
        // Handle error, and 'end' event will be emitted after this as well
        console.log( err );
        updateSockets( err );
    })
    .on('result', function( user ) {
        // it fills our array looping on each user row inside the db
        users.push( user );
    })
    .on('end',function(){
        // loop on itself only if there are sockets still connected
        if(connectionsArray.length) {
            pollingTimer = setTimeout( pollingLoop, POLLING_INTERVAL );
            updateSockets({users:users});
        }
    });
};

// creating a new websocket to keep the content updated without any AJAX request
io.sockets.on( 'connection', function ( socket ) {
    console.log('Number of connections:' + connectionsArray.length);
    // starting the loop only if at least there is one user connected
    if (!connectionsArray.length) {
        pollingLoop();
    }
    socket.on('disconnect', function () {
        var socketIndex = connectionsArray.indexOf( socket );
        console.log('socket = ' + socketIndex + ' disconnected');
        if (socketIndex >= 0) {
            connectionsArray.splice( socketIndex, 1 );
        }
    });
    socket.on('ddd', function (name) {
        socket.username=name;
    });

    console.log( 'A new socket is connected!' );
    connectionsArray.push( socket );
});
var updateSockets = function ( data ) {
    // adding the time of the last update
    data.time = new Date();
    // sending new data to all the sockets connected
    connectionsArray.forEach(function( tmpSocket ){
        tmpSocket.volatile.emit( 'notification' , data );
    });
};