Added counter

compose/counter/app/index.js

@@ -0,0 +1,37 @@
+var express = require('express');
+var app = express();
+var mysql = require("mysql");
+var con = mysql.createConnection({ 
+  host: process.env.DB_HOST, // Use DB_HOST instead of MYSQL_HOST
+  user: process.env.DB_USER, 
+  password: process.env.DB_PASSWORD, 
+  database: process.env.DB_NAME // Use DB_NAME instead of MYSQL_DATABASE
+});
+
+// mysql code
+con.connect(function(err){
+  if(err){
+    console.log('Error connecting to db: ', err);
+    return;
+  }
+  console.log('Connection to db established');
+  con.query('CREATE TABLE IF NOT EXISTS visits (id INT NOT NULL PRIMARY KEY AUTO_INCREMENT, ts BIGINT)',function(err) {
+    if(err) throw err;
+  });
+});
+
+// Request handling
+app.get('/', function (req, res) {
+  con.query('INSERT INTO visits (ts) values (?)', Date.now(), function(err, dbRes) {
+    if(err) throw err;
+    res.send('Hello World! You are visitor number ' + dbRes.insertId);
+  });
+});
+
+// server
+var server = app.listen(3000, function () {
+  var host = server.address().address;
+  var port = server.address().port;
+
+  console.log('Example app listening at http://%s:%s', host, port);
+});