How can I execute db.copyDatabase through NodeJS's MongoDB native driver? - node.js

Question

I do have a shell script that invokes
mongo --eval "db.copyDatabase('somedatabase', 'somedatabase_duplicate', 'sourcehost')"
to copy a database.
Currently I am stuck with doing the same from within a Node.JS application. Calling
mongoCommand = `db.copyDatabase("somedatabase", "somedatabase_duplicate", "localhost")`;
db.command(mongoCommand, function(commandErr, data) {
if(!commandErr) {
log.info(data);
} else {
log.error(commandErr.errmsg);
}
});
Always resulsts in a "no such command" error message.
Edit for clarification: Using db.admin().command() results in the same problem and using the command suggested in enter link description here, too.
What's the correct way to call this command or, alternatively, to clone a database from Node.JS?

Answer 1

Well, you are trying to copy database which is administration operation so have to do with admin account. Again, to copy database command is copydb.
try running this command in shell, db.copyDatabase and you'll see source of command.
try:
var assert = require('assert');
var MongoClient = require('mongodb').MongoClient;
var url = 'mongodb://localhost:27017/test';
MongoClient.connect(url, function(err, db) {
if (err) {
console.log(err);
}
else {
var mongoCommand = { copydb: 1, fromhost: "localhost", fromdb: "test", todb: "test_dup" };
var admin = db.admin();
admin.command(mongoCommand, function(commandErr, data) {
if (!commandErr) {
console.log(data);
} else {
console.log(commandErr.errmsg);
}
db.close();
});
}
});

Answer 2

//core modules
const assert = require('assert')
const MongoClient = require('mongodb').MongoClient;
const moment = require('moment');
const mongo = require('mongodb')
//custom modules
let { ip, port, database } = require('./dbUpgradeConfig')
const url = `mongodb://${ip}:${port}`
let todayDate = moment().format('DD/MM/YYYY HH:mm')
console.log(todayDate)
const myDate = new Date()
console.log(myDate)
var d = Date(Date.now());
// Converting the number of millisecond in date string
a = d.toString()
// Options for mongoDB
const mongoOptions = { useNewUrlParser: true }
let db
//TODO: handle reconnect
let connect = () => {
return new Promise((resolve, reject) => {
if (db) resolve()
else {
mongo.connect(url, mongoOptions, (err, client) => {
if (err) reject(err)
else {
db = client.db(database)
resolve()
}
})
}
})
}
/**
* #description create duplicate database from current database in mongodb
*/
let CloneDb = () => {
return new Promise((resolve, reject) => {
connect()
.then(() => {
console.log(db)
let mongoCommand = { copydb: 1, fromhost: "localhost", fromdb: "db_name", todb: "db_name_duplicate" }
let adminDB = db.admin()
adminDB.command(mongoCommand, function (commandErr, data) {
if (!commandErr) {
console.log(data)
} else {
console.log(commandErr.errmsg)
}
});
})
})
}
CloneDb().then(data => {
// debugger;
console.log("The clone db", data)
})