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I'm trying to insert multiple documents to my DB using node.js , the thing is that i'm getting an error: MongoError: Connection closed by application There is any option to insert multiple documents in parallel?
Here is my code:
var MongoClient = require('mongodb').MongoClient;
var dbName = "tst1";
var port = "27017";
var requiredCollection = "stocks"
var host = "localhost";
// open the connection the DB server
MongoClient.connect("mongodb://" + host + ":" + port + "/" + dbName, function (error, db){
console.log("Connection is opened to : " + "mongodb://" + host + ":" + port + "/" + dbName);
if(error) throw error;
var ibm = {'_id' : 1, 'value' : 1, 'ticker' : 'IBM'};
db.collection(requiredCollection).insert(ibm, function(error, inserted) {
if(error) {
console.error(error);
}
else {
console.log("Successfully inserted: " , inserted );
}
}); // end of insert
var apple = {'_id' : 2, 'vlue' : 1, 'ticker' : 'AAPL'};
db.collection(requiredCollection).insert(apple, function(error, inserted) {
if(error) {
console.error(error);
}
else {
console.log("Successfully inserted: " , inserted );
}
}); // end of insert
var intel = {'_id' : 3, 'value' : 1, 'ticker' : 'INTC'};
db.collection(requiredCollection).insert(intel, function(error, inserted) {
if(error) {
console.error(error);
}
else {
console.log("Successfully inserted: " , inserted );
}
}); // end of insert
var f5 = {'_id' : 4, 'value' : 1, 'ticker' : 'FFIV'};
db.collection(requiredCollection).insert(f5, function(error, inserted) {
if(error) {
console.error(error);
}
else {
console.log("Successfully inserted: " , inserted );
}
}); // end of insert
var arris = {'_id' : 5, 'value' : 1, 'ticker' : 'ARRS'};
db.collection(requiredCollection).insert(arris, function(error, inserted) {
if(error) {
console.error(error);
}
else {
console.log("Successfully inserted: " , inserted );
}
}); // end of insert
db.close();
}); // Connection to the DB
I'm trying to insert multiple documents to my DB using node.js , the thing is that i'm getting an error: MongoError: Connection closed by application There is any option to insert multiple documents in parallel?
Here is my code:
var MongoClient = require('mongodb').MongoClient;
var dbName = "tst1";
var port = "27017";
var requiredCollection = "stocks"
var host = "localhost";
// open the connection the DB server
MongoClient.connect("mongodb://" + host + ":" + port + "/" + dbName, function (error, db){
console.log("Connection is opened to : " + "mongodb://" + host + ":" + port + "/" + dbName);
if(error) throw error;
var ibm = {'_id' : 1, 'value' : 1, 'ticker' : 'IBM'};
db.collection(requiredCollection).insert(ibm, function(error, inserted) {
if(error) {
console.error(error);
}
else {
console.log("Successfully inserted: " , inserted );
}
}); // end of insert
var apple = {'_id' : 2, 'vlue' : 1, 'ticker' : 'AAPL'};
db.collection(requiredCollection).insert(apple, function(error, inserted) {
if(error) {
console.error(error);
}
else {
console.log("Successfully inserted: " , inserted );
}
}); // end of insert
var intel = {'_id' : 3, 'value' : 1, 'ticker' : 'INTC'};
db.collection(requiredCollection).insert(intel, function(error, inserted) {
if(error) {
console.error(error);
}
else {
console.log("Successfully inserted: " , inserted );
}
}); // end of insert
var f5 = {'_id' : 4, 'value' : 1, 'ticker' : 'FFIV'};
db.collection(requiredCollection).insert(f5, function(error, inserted) {
if(error) {
console.error(error);
}
else {
console.log("Successfully inserted: " , inserted );
}
}); // end of insert
var arris = {'_id' : 5, 'value' : 1, 'ticker' : 'ARRS'};
db.collection(requiredCollection).insert(arris, function(error, inserted) {
if(error) {
console.error(error);
}
else {
console.log("Successfully inserted: " , inserted );
}
}); // end of insert
db.close();
}); // Connection to the DB
-
1
You need to read up on "asynchronous" code. The
.close()is being called before all the other operations plete. The operations do not "plete" in order necessarily. Take a look at "async" as a node library for examples of how to clearly do this in "series" as you intend. Generally speaking though, you almost never really want to explicitly close your database connection unless you are truly done. – Neil Lunn Commented Sep 1, 2014 at 11:17 - can you give me some code example? – Alex Brodov Commented Sep 1, 2014 at 11:20
3 Answers
Reset to default 5In MongoDB version 3.2 and above, you can use db.collection.insertMany() for saving multiple documents into a collection. (see documentation)
Your code can be simplified to:
var MongoClient = require('mongodb').MongoClient;
var dbName = "tst1";
var port = "27017";
var requiredCollection = "stocks"
var host = "localhost";
// open the connection the DB server
MongoClient.connect("mongodb://" + host + ":" + port + "/" + dbName, function (error, db){
console.log("Connection is opened to : " + "mongodb://" + host + ":" + port + "/" + dbName);
if(error) throw error;
var docs = [{ _id: 1, value: 1, ticker: 'IBM' },
{ _id: 2, value: 1, ticker: 'AAPL' },
{ _id: 3, value: 1, ticker: 'INTC' },
{ _id: 4, value: 1, ticker: 'FFIV' },
{ _id: 5, value: 1, ticker: 'ARRS' }];
db.collection(requiredCollection).insertMany(docs, function(error, inserted) {
if(error) {
console.error(error);
}
else {
console.log("Successfully inserted: " , inserted );
}
}); // end of insert
db.close();
}); // Connection to the DB
The "async" library helps you here as you need to understand "callbacks" in asynchronous code and the main thing this helps you with is "code creep" by removing the need to "indent" each "next" call in code.
In fact you can do these in "parallel" rather than "series" for a reasonable amount of operations. We just need to "wait" for each to plete, which is what a "callback" is for. It "calls back" to invoke the "next action" when the operation is plete:
var MongoClient = require('mongodb').MongoClient,
async = require('async');
var dbName = "tst1";
var port = "27017";
var requiredCollection = "stocks"
var host = "localhost";
// open the connection the DB server
MongoClient.connect("mongodb://" + host + ":" + port + "/" + dbName, function (error, db){
console.log("Connection is opened to : " + "mongodb://" + host + ":" + port + "/" + dbName);
if(error) throw error;
async.parallel(
[
function(callback) {
var ibm = {'_id' : 1, 'value' : 1, 'ticker' : 'IBM'};
db.collection(requiredCollection).insert(ibm, function(error, inserted) {
if(error) {
console.error(error);
callback(error);
} else {
console.log("Successfully inserted: " , inserted );
callback();
}
}); // end of insert
},
function(callback) {
var apple = {'_id' : 2, 'vlue' : 1, 'ticker' : 'AAPL'};
db.collection(requiredCollection).insert(apple, function(error, inserted) {
if(error) {
console.error(error);
callback(error);
} else {
console.log("Successfully inserted: " , inserted );
callback();
}
}); // end of insert
},
function(callback) {
var intel = {'_id' : 3, 'value' : 1, 'ticker' : 'INTC'};
db.collection(requiredCollection).insert(intel, function(error, inserted) {
if(error) {
console.error(error)
callback(error);
} else {
console.log("Successfully inserted: " , inserted );
callback();
}
}); // end of insert
},
function(callback) {
var f5 = {'_id' : 4, 'value' : 1, 'ticker' : 'FFIV'};
db.collection(requiredCollection).insert(f5, function(error, inserted) {
if(error) {
console.error(error);
callback(error);
} else {
console.log("Successfully inserted: " , inserted );
callback();
}
}); // end of insert
},
function(callback) {
var arris = {'_id' : 5, 'value' : 1, 'ticker' : 'ARRS'};
db.collection(requiredCollection).insert(arris, function(error, inserted) {
if(error) {
console.error(error)
callback(error);
} else {
console.log("Successfully inserted: " , inserted );
}
}); // end of insert
},
],
function(err) {
// called when everything is done
db.close();
}
);
}); // Connection to the DB
Each operation now waits for it's "callback" to be called from it's own "callback" context as well as there being the "flow control" to wait until all operations have pleted before finally "closing" the connection at the end of all operations.
But as said earlier, unless this is a "one off" script you basically never call .close() on the database connection and you only ever open it once.
you could use mongo bulk insert https://docs.mongodb./manual/reference/method/Bulk.insert/
var bulk = db.items.initializeUnorderedBulkOp();
bulk.insert( { item: "abc123", defaultQty: 100, status: "A", points: 100 } );
bulk.insert( { item: "ijk123", defaultQty: 200, status: "A", points: 200 } );
bulk.insert( { item: "mop123", defaultQty: 0, status: "P", points: 0 } );
bulk.execute();
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