Playing with MongoDB - Inserting documents

students.js

//////////////////////////////
// Playing with MongoDB /////
// 1 - Inserting documents /
///////////////////////////

// MongoDB Driver module.

var MongoClient = require('mongodb').MongoClient

// Set the name of the database you want to connect with.

,   database = "college";

MongoClient.connect('mongodb://localhost:27017/' + database, function(err, db) {
    
    if(err) throw err;
    
    // Set the number of docs you want to insert.

    var n = 1000; 

    for (var i = 0; i<n; i++) {

        var temp = 0
        ,   careers = ["Engineering",  "Medicine", "Marketing", "Design", "Education", "Laws"]
        ,   langs = ["EN", "POR", "ES", "FRA", "ITA", "GER"]
        ,   first_names = [
                        ["John", "Brian", "Robert", "Tim", "Aaron", "Noah", "Ian", "Nathan", "Ethan", "Michael", "James", "Daniel", "Willian", "Dylan", "Matthew", "Jack", "Justin", "Brandon", "Adam", "Harry"],
                        ["Karen", "Monica", "Rose", "Cindy", "Chloe", "Emily", "Jennifer", "Jessica", "Zoe", "Ellie", "Paige", "Taylor", "Lucy", "Katie", "Sarah", "Mia", "Vanessa", "Amber", "Sophia", "Emma"]
                    ]
        ,   last_names = ["Smith", "Brown", "Jones", "Miller", "Davis", "Williams", "Lee", "Thompson", "Taylor", "Walker", "Robinson", "Carter", "Evans", "Allen", "Adams", "Baker", "Harris", "Clark", "Scott", "Johansson"]
        ,   genders = ["Male", "Female"]
        ,   gender = Math.round(Math.random()*1)
        ,   phone = "55" + Math.round(Math.random()*9) + "-" + Math.round(Math.random()*9) + "7" + Math.round(Math.random()*9) + "3"
        ,   doc = {
                    student: i,
                    personal_info: {    
                                        name: first_names[gender][Math.round(Math.random()*19)] + " " + last_names[Math.round(Math.random()*19)],
                                        gender: genders[gender],
                                        phone:  phone,
                                        email: "student_" + i + "@university.edu"
                                    },
                    career: careers[Math.round(Math.random()*5)], 
                    language: langs[Math.round(Math.random()*5)],
                    grades: { 
                                year1: Math.random()*100,
                                year2: Math.random()*100,
                                year3: Math.random()*100,
                                year4: Math.random()*100  
                            }
                };

    	db.collection('students').insert(doc, function(err, record) {
            
            if(err) throw err;
            
            // Count the number of document inserted in the database. 

            temp += Object.keys(record).length;

            // When the temp reach the n value, it will close the database safely.  
	        
            if (temp >= n) {
                console.log(temp + " files were successfully inserted!");
                db.close();
            }
        
    	});

    }

});