index.js

//mysql
var knex = require('knex');

//neo4j
var neo4j = require('neo4j');

//mongo
var express = require("express"),
    mongoose = require("mongoose"),
    app = express();


//DB initializations

/* ================= mongo =================*/
mongoose.connect("mongodb://localhost/test", function (err) {
  if (!err) {
    console.log("Connected to MongoDB");
  } else {
    console.error(err);
  }
});

app.get("/", function (req, res) {
  res.send("Hey buddy!");
});

var Thing = require("./model");

app.get("/:name", function (req, res) {
  Thing.find({ name: req.params.name }, function (err, t) {
    if (t.length < 1) {
      var thing = new Thing();
      thing.name = req.params.name;
      thing.save(function(err, savedThing) {
        if (err) {
          res.send(500);
        } else {
          res.send({returnObj: savedThing, created: true});
        }
      });
    } else {
      res.send({returnObj: t[0], created: false});
    }
  });
});

app.listen(3000);


/* ================= mysql =================*/
var db_mysql = knex.initialize({
  client: 'mysql',
  connection: {
    host     : '127.0.0.1',
    user     : 'shippable',
    password : '',
    database : 'test'
  }
});

db_mysql.schema.hasTable('things').then(function (exists) {
  if (!exists) {
    console.log('Table does not exist, creating...');
    db_mysql.raw('CREATE TABLE things (name char(20));').then(function (res) {
      console.dir(res);
    });
  }
});

module.exports.db_mysql = db_mysql;


/* ================= neo4j =================*/
var db_neo4j = new neo4j.GraphDatabase('http://localhost:7474');
module.exports.db_neo4j = db_neo4j;