Added index

compose/app/index.js

@@ -1,10 +1,32 @@
 var express = require('express');
 var app = express();
+var mysql = require("mysql");
+var con = mysql.createConnection({ host: process.env.MYSQL_HOST, user: process.env.MYSQL_USER, password: process.env.MYSQL_PASSWORD, database: process.env.MYSQL_DATABASE});
 
-app.get('/', function (req, res) {
-  res.send('Hello World!');
+// 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) {
+  // create table if not exist
+  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;