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Nodejs-Socketio-Mysql-Demo/app.js

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+var fs = require('fs');
+var db_helper = require("./db_helper.js");
+
+var http = require('http').createServer(function handler(req, res) {
+  fs.readFile(__dirname + '/index.html', function(err, data) {
+    if (err) {
+      res.writeHead(500);
+      return res.end('Error loading index.html');
+    } else {
+      res.writeHead(200);
+      res.end(data);
+    }
+  });
+}).listen(3000);
+
+var io = require('socket.io').listen(http);
+io.sockets.on('connection', function(client) {
+  console.log('Client connected'); 
+
+  // populate employees on client
+  db_helper.get_employees(function(employees) {
+    client.emit('populate', employees);
+  });
+  
+  // client add new employee
+  client.on('add employee', function(data) {
+    // create employee, when its done repopulate employees on client
+    db_helper.add_employee(data, function(lastId) {
+      // repopulate employees on client
+      db_helper.get_employees(function(employees) {
+        client.emit('populate', employees);
+      });
+    });
+  });
+});
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