NodeJS DB2 Connection pooling for Express app - node.js

Question

I see very few online posts when it comes to NodeJS with IBM DB2. I am new to NodeJS and having issues to configure connection pooling for my web app. I am successfully running node app with single connection in my local but not sure how to configure connection pooling. Below code is how I have it for single connection.
DBConnection JS:
module.exports = function(dbConnection)
{
var Pool = require('ibm_db').Pool;
var pool = new Pool();
pool.open("MY_CONNECTION_STRING",function(err,connection){
//error handling logic ...
dbConnection(connection);
});
}
App listener js:
var express = require('express');
var app = express();
app.listen(8080,function(){
console.log("server started..);
});
require('./DBConnection')(function(connection){
app.get('/getEmpId',function(req,res){
connection.query("MY_SQL_QUERY",function(error,results,fields){
//some other logic
res.send(results[0]);
//Closing connection
connection.close(function(err2) {
if(err2) console.log(err2);
});
});
});
}
Need your suggestions to setup connection pool where I can use one connection for each request when concurrent users are accessing and close the connection after serving request.

Answer 1

You can take a look at the brief samples provided with the IBM node-ibm_db driver. It has a section on Connection Pooling. The driver reuses the node-odbc pool and you need to invoke the open/close calls on the Pool object. Here is the sample taken from the node-ibm_db site:
var Pool = require("ibm_db").Pool
, pool = new Pool()
, cn = "DATABASE=dbname;HOSTNAME=hostname;PORT=port;PROTOCOL=TCPIP;UID=dbuser;PWD=xxx";
pool.open(cn, function (err, db) {
if (err) {
return console.log(err);
}
//db is now an open database connection and can be used like normal
//if we run some queries with db.query(...) and then call db.close();
//a connection to `cn` will be re-opened silently behind the scense
//and will be ready the next time we do `pool.open(cn)`
});