ConstructionCost/modules/users/models/umDB.js

var mg = require('mongoose');
mg.connect('mongodb://localhost/usersManages');

mg.connection.on('connected', function(){console.log('Mongoose connected to usersManages.')});
mg.connection.on('disconnected', function(){console.log('Mongoose disconnected.')});
mg.connection.on('error', function(err){console.log('Mongoose connect error:' + err)});

exports.mongoose = mg;