在node.js中如何将MongoDB数据同步到MySQL中去

/**
* Created by kevalin on 2015/4/22.
*/
var express = require('express');
var router = express.Router();
var mysql = require('mysql');
var conf = require('../config/dbconnection');
//定义pool池
var pool = mysql.createPool(
{
host : conf.dbMysql.host,
user : conf.dbMysql.user,
password : conf.dbMysql.password,
database : conf.dbMysql.database,
port : conf.dbMysql.port
}
);
router.get('/', function(req, res) {
var selectSites = "select *, date_format(do_time, '%Y-%m-%d %H:%i:%s') as time from siteinfo order by id";
pool.getConnection(function(err, connection) {
if (err) throw err;
connection.query(selectSites, function(err, rows) {
if (err) throw err;
res.render('sites', {title : '站点分布', results : rows});
//回收pool
connection.release();
});
});
});
module.exports = router;

User.find({}, (err, user) => {
 if (err)
 res.send(err);
 for( let i = 0 ; i < family.length ; i ++ ) { 
 console.log("第" + (i + 1) + "条数据");
 let username = user[i].username; 
 let email = user[i].email;
 let password = user[i].password; 
 let sql = "insert into user_table(username, email, password) values (&#39;" + username + "&#39;,&#39;" + email + "&#39;,&#39;" + password + "&#39;);";
 pool.query(sql,(err, rows) => {
  if (err)
  res.send(err); 

  res.json({
  message:&#39;数据插入成功&#39;,
  rows
  });  
 });
 }
});