绑定云铸造厂中的服务不起作用

我已经从市场上创建了postgress服务（通过cf create-service），我想在我的节点.js应用程序中使用它。我两个问题

1.我尝试了以下方法，但应用程序无法启动，并且在日志中我得到了 这是我对环境变量的价值，我在这里错过了什么？

这是代码：

OK i've tried the following and the application doesnt able to start and in the log I got 

这是我对环境变量的价值，我在这里错过了什么？

     OUT env variable host: 10.0.97.139
     OUT port: 34807
     OUT user: qmxgvfybloierztm
     OUT password: mlofvwfsxmf7bqjr
     OUT database: r8n13yjyql7hwrgc
     OUT url: postgres://qmxgvfybloierztm:mlofvwfsxmf7bqjr@10.0.97.135:34607/r8n13yjyql7hwrgc
     OUT start create table
     OUT ERROR: connect: Error: connect ECONNREFUSED 10.0.97.135:5432


(function(){
    if (null == process.env.VCAP_SERVICES) {
        var url = 'postgress://localhost:27017/local';
    }
    else {
        var vcap_services = JSON.parse(process.env.VCAP_SERVICES);
        console.log("postgress URL: ", url);
    };
    var DBWrapper = require('node-dbi').DBWrapper;
    var dbConnectionConfig = {
        uri: vcap_services['postgresql'][0].credentials.uri,
        host: vcap_services['postgresql'][0].credentials.hostname,
        port: vcap_services['postgresql'][0].credentials.port,
        database: vcap_services['postgresql'][0].credentials.dbname,
        user: vcap_services['postgresql'][0].credentials.username,
        password: vcap_services['postgresql'][0].credentials.password
    };
    var dbWrapper = new DBWrapper('pg', dbConnectionConfig);
    dbWrapper.connect();
    console.log("start create table");
    dbWrapper.query("CREATE TABLE IF NOT EXISTS TAB1 ( firstname  TEXT primary key, lastname varchar(20) )", function (err, results) {
        if (err) {
            console.log("error while inserting data " + err);
        } else {
            console.log("success to insert data: ");
        }
    });
    })();

更新（在杰罗姆回答之后...这是我的全部代码!!

"use strict";
var express = require("express");
var path = require("path");

var app = express();

var port = process.env.PORT || 3000;
app.listen(port, function () {

    (function () {

        var DBWrapper = require('node-dbi').DBWrapper;
        var vcap_services = JSON.loparse(process.env.VCAP_SERVICES);
        var pgconf = vcap_services['postgresql'][0].credentials;
        var dbConnectionConfig = {
            dsn: pgconf.uri
        };
        var dbWrapper = new DBWrapper('pg', dbConnectionConfig);
        dbWrapper.connect();

        console.log("env variable host: " + pgconf.hostname)
        console.log("port: " + pgconf.port);
        console.log("user: " + pgconf.user);
        console.log("password: " + pgconf.password);
        console.log("database: " + pgconf.database);
        console.log("url: " + pgconf.uri);

        console.log("start create table");
        dbWrapper.query("CREATE TABLE IF NOT EXISTS USER ( firstname  TEXT primary key, lastname varchar(20) )", function (err, results) {
            if (err) {
                console.log("error while inserting data " + err);
            } else {
                console.log("success to insert data: ");
            }
        });

        var data =
        {
            firstname: 'John5',
            lastname: 'Foo4444'
        };
        //insert data
        dbWrapper.insert('USER', data, function (err, data) {
            if (err) {
                console.log("error to insert data: " + err);
                // John has been inserted in our table, with its properties safely escaped
            } else {
                console.log("test" + data);
            }
        });
        //read data
        dbWrapper.fetchAll("SELECT * FROM USER", null, function (err, result) {
            if (!err) {
                console.log("Data came back from the DB.", result);
            } else {
                console.log("DB returned an error: %s", err);
            }
            dbWrapper.close(function (close_err) {
                if (close_err) {
                    console.log("Error while disconnecting: %s", close_err);
                }
            });
        });
    })();

});

现在我得到了这个错误

2016-07-26T11:55:49.69+0300 [App/0]      OUT env variable host: undefined
2016-07-26T11:55:49.69+0300 [App/0]      OUT port: 35058
2016-07-26T11:55:49.69+0300 [App/0]      OUT user: undefined
2016-07-26T11:55:49.69+0300 [App/0]      OUT password: hvevfgpjjtyqpr1d
2016-07-26T11:55:49.69+0300 [App/0]      OUT database: undefined
2016-07-26T11:55:49.69+0300 [App/0]      OUT url: postgres://fakttklwkxtfprgv:hvevfgpjjtyqpr1d@10.0.97.140:35058/ispkmc5psgdrwj4e
2016-07-26T11:55:49.69+0300 [App/0]      OUT start create table
2016-07-26T11:55:49.69+0300 [App/0]      OUT ERROR: connect: Error: getaddrinfo ENOTFOUND undefined undefined:5432