Async functionality not functioning

Please read the documentation on the Async's series method (click here)

In order to move to the next function in the series, the callback needs to be invoked

async.series([
  function(callback){
    crypto.randomBytes(8, function(ex, buf) {
      var array     = req.files.key.originalFilename.split('.');
      var type      = array[array.length - 1];
      var name      = buf.toString('hex') + '.' + type;
      fs.rename(req.files.key.path, './public/images/' + name, function(e) {
        if (e) {
          res.send(500, e.message);
        } else {
          res.send("I got the message - This i confirm");
        }
        callback(null); // Pass whatever you think is appropriate
      });
    });
  },
  function(callback){
      connection.query('INSERT INTO ImagePostingTABLE (Image_Name) VALUES (?)', [file_name], function (err, rows, fields) {
          console.log('Connection result error ' + err);
          callback(err, rows)
        });
  }
]);

With the help of C Blanchard & Bulkan ..... i got solution for this

Here is the complete solution :: This may help someone looking something similar

var express=require('express');

    var fs=require('fs');
    var http=require('http');
    var crypto=require('crypto');
    var mysql=require('mysql');
    var async=require('async');

    var app=express();

    var connection=mysql.createConnection({
        host: 'localhost',
        user: 'root',
        database: 'ImagePostingDB'
    });

    connection.connect();
    app.set('port',process.env.PORT||7002); 
    app.use('/Details',express.static(__dirname+'/public/images')); 
    app.use(express.bodyParser());

    app.post('/Details/',function(req,res,next) {
      var file_name=req.files.key.originalFilename;

      console.log(file_name);
      async.series( [
        // Get the first table contents
        function ( callback ) {
          crypto.randomBytes(8, function(ex, buf) {

            var array = req.files.key.originalFilename.split('.');
            var type  = array[array.length - 1];
            var name  = buf.toString('hex') + '.' + type;

            fs.rename(req.files.key.path, './public/images/' + name, function(e) {

              if (e) {
                res.send(500, e.message);
              } else {
                res.send("I got the message - This i confirm");
              }

              return callback(null);
            });
          });
        },
        // Updating the database
        function ( callback ) {
          connection.query('INSERT INTO ImagePostingTABLE (Image_Name) VALUES (?)', [file_name], function (err, rows, fields) {
            console.log('Connection result error ' + err);
            return callback(null);
          });
        }
      ]);
    });

    app.get('/Details/',function(req,res){
            res.send("Image displayed");
    });

    http.createServer(app).listen(app.get('port'),function(){
            console.log('Express server listening on port'+app.get('port'));

    });