Redis Object Mapping, Object style, NoSQL inside.

redis_object_mapping.js

//assume user table with 4 columns: id, name, email, last_login. id is the key column.
//give id, then we fetch from redis like : users:id:name, users:id:email, users:id:last_login.
//maybe we should return a user object to client.

var async = require('async');
var db = require('redis').createClient();
var user = {};
var id = 1; // fetch from request parameter

var column_fetch = function(id, column, callback) {
  return function(callback){
    db.get('users:'+id+':'+column, function(err, column){
      if(err) {
        callback(err, null);
        return;
      }
      callback(null, column);
    });
  };
}

exports.fetch = function(id, cb){
  async.parallel({
    name: column_fetch(id, 'name', cb),
    email: column_fetch(id, 'email', cb),
    last_login: column_fetch(id, 'last_login', cb)
  },cb);
}

// client
fetch(1, function(err, user){
  if(err)
    console.error(err);
  else
    console.info(user);
});