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MongoDB update

Pankaj - 10 Comments
Filed Under: MongoDB

MongoDB update is used to update document in a collection. In last tutorial, we learned about MongoDB insert with Mongo Shell and Java driver. Today we will look into MongoDB update and different options provided by Mongo Shell and Java driver.

MongoDB update

MongoDB update, mongodb update document

MongoDB shell client update syntax is:


db.collection.update(
   <query>,
   <update>,
   {
     upsert: <boolean>,
     multi: <boolean>,
     writeConcern: <document>
   }
)

First parameter in MongoDB update is query that gives us the target rows – for example {country:"USA"} to get all documents where country is USA and {country:{$ne:"USA"}} to get all the documents where country is not USA.

Second parameter in MongoDB update is used to define the list of fields to update, for example we can use {name:"Pankaj Updated"} to update the name.

Other options in MongoDB update are optional but important too;

  1. if upsert is specified as true then update query will insert a document if there are no matches to the query, default value is false.
  2. if multi is specified as true then all the documents that matches the query criteria will be updated, default value is false.
  3. writeConcern can be used to specify write concern, if not provided default write concern will be used.

MongoDB Update Document Operators

We have many mongo update parameter operators available – most widely used are $set, $inc, $currentDate.

Name Description
$inc Increments the value of the field by the specified amount.
$mul Multiplies the value of the field by the specified amount.
$rename Renames a field.
$setOnInsert Sets the value of a field upon document creation during an upsert.
Has no effect on update operations that modify existing documents.
$set Sets the value of a field in a document.
$unset Removes the specified field from a document.
$min Only updates the field if the specified value is less than the existing field value.
$max Only updates the field if the specified value is greater than the existing field value.
$currentDate Sets the value of a field to current date, either as a Date or a Timestamp.

We will look into some of these in next sections.

Few important points to note with MongoDB update operations are:

  1. If <update> document contains update operators then it must contain only update operator expressions and only corresponding fields will be updated.
  2. If the <update> document contains only field:value expressions then it will replace the query matching document (except _id) and we can’t update multiple documents with this (make sense, it will have duplicate data).
  3. If upsert is true and no document matches the query criteria, update() inserts a single document. The update creates the new document with either:

    The fields and values of the <update> parameter or the fields and values of both <query> and <update> parameters if the <update> parameter contains only update operator expressions. The update creates a base document from the equality clauses in the <query> parameter, and then applies the update expressions from the <update> parameter.

MongoDB Update Document Example

Now let’s see some of the MongoDB update example using Mongo shell.

  1. MongoDB Update single field in a single document

    
> db.Persons.drop()
true
> db.Persons.insert([
... {_id:123,name:"Pankaj",country:"USA"},
... {_id:456,name:"David",country:"USA"},
... {_id:789,name:"Lisa",country:"India"}]
... )
BulkWriteResult({
	"writeErrors" : [ ],
	"writeConcernErrors" : [ ],
	"nInserted" : 3,
	"nUpserted" : 0,
	"nMatched" : 0,
	"nModified" : 0,
	"nRemoved" : 0,
	"upserted" : [ ]
})
> db.Persons.update({name:"Pankaj"},{$set: {country:"India"}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.Persons.find()
{ "_id" : 123, "name" : "Pankaj", "country" : "India" }
{ "_id" : 456, "name" : "David", "country" : "USA" }
{ "_id" : 789, "name" : "Lisa", "country" : "India" }
>

    Notice that I am using $set operator to update a field value, if we don’t use that it will replace the whole document, as shown below. We can use it to replace all the fields in a particular document.

    
> db.Persons.update({name:"Pankaj"},{country:"India"})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.Persons.find()
{ "_id" : 123, "country" : "India" }
{ "_id" : 456, "name" : "David", "country" : "USA" }
{ "_id" : 789, "name" : "Lisa", "country" : "India" }
>

  2. MongoDB Update multiple fields

    Notice that $set is used with JSON data, so if you want multiple fields to set then we can pass them as JSON.

    
> db.Persons.update({name:"David"},{$set: {country:"India",name:"David New"}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.Persons.find()
{ "_id" : 123, "country" : "India" }
{ "_id" : 456, "name" : "David New", "country" : "India" }
{ "_id" : 789, "name" : "Lisa", "country" : "India" }
>

  3. MongoDB Update – Add a new field

    We can use $set operator to add a new field to the document too, as shown below.

    
> db.Persons.drop()
true
> db.Persons.insert([ {_id:123,name:"Pankaj",country:"USA"}, {_id:456,name:"David",country:"USA"}, {_id:789,name:"Lisa",country:"India"}])
BulkWriteResult({
	"writeErrors" : [ ],
	"writeConcernErrors" : [ ],
	"nInserted" : 3,
	"nUpserted" : 0,
	"nMatched" : 0,
	"nModified" : 0,
	"nRemoved" : 0,
	"upserted" : [ ]
})
> db.Persons.update({_id:123},{$set: {city: "San Jose"}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.Persons.find({_id:123})
{ "_id" : 123, "name" : "Pankaj", "country" : "USA", "city" : "San Jose" }
>

  4. MongoDB Update subdocument

    We can use mongo update dot operator to update values in a MongoDB subdocument, it’s very similar to java syntax to access methods and variables.

    
> db.Persons.insert({_id:100,name:"Pankaj",address:{city:"San Jose",country:"USA"}})
WriteResult({ "nInserted" : 1 })
> db.Persons.update({_id:100},{$set: {"address.city": "Santa Clara"}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.Persons.find({_id:100})
{ "_id" : 100, "name" : "Pankaj", "address" : { "city" : "Santa Clara", "country" : "USA" } }
>

    Notice the use of double quote for key, if double/single quote is not used then it will throw error message as SyntaxError: Unexpected token ..

  5. MongoDB Update – Remove a field

    We can use MongoDB update $unset operator to remove a field from the document.

    
> db.Persons.find({_id:123})
{ "_id" : 123, "name" : "Pankaj", "country" : "USA", "city" : "San Jose" }
> db.Persons.update({_id:123},{$unset: {city: ""}})
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
> db.Persons.find({_id:123})
{ "_id" : 123, "name" : "Pankaj", "country" : "USA" }
>

  6. MongoDB Update – Insert a new document if no match found

    
> db.Persons.update({name:"Pankaj"},{$set: {country:"India"}},{upsert: true})
WriteResult({
	"nMatched" : 0,
	"nUpserted" : 1,
	"nModified" : 0,
	"_id" : ObjectId("53fe495bcc59ebd19e1adebb")
})
> db.Persons.find()
{ "_id" : ObjectId("53fe495bcc59ebd19e1adebb"), "name" : "Pankaj", "country" : "India" }
>

  7. MongoDB Update multiple documents

    
> db.Persons.insert([{name:"Pankaj",salary:5000}, {name:"David",salary:10000}, {name:"Lisa",salary:8000}] )
BulkWriteResult({
	"writeErrors" : [ ],
	"writeConcernErrors" : [ ],
	"nInserted" : 3,
	"nUpserted" : 0,
	"nMatched" : 0,
	"nModified" : 0,
	"nRemoved" : 0,
	"upserted" : [ ]
})
> db.Persons.update({salary: {$lt:9000}},{$inc: {salary: 1000}},{multi:true})
WriteResult({ "nMatched" : 2, "nUpserted" : 0, "nModified" : 2 })
> db.Persons.find()
{ "_id" : ObjectId("53fe49f7b1e38e3716f79117"), "name" : "Pankaj", "salary" : 6000 }
{ "_id" : ObjectId("53fe49f7b1e38e3716f79118"), "name" : "David", "salary" : 10000 }
{ "_id" : ObjectId("53fe49f7b1e38e3716f79119"), "name" : "Lisa", "salary" : 9000 }
>

    Above update() has incremented the salary by 1000 for every document where salary is less than 9000.

MongoDB update document example using Java Driver

We looked into different MongoDB document update example using Mongo Shell. Now let’s look at some of the examples using MongoDB java driver.

  1. MongoDB Update Java Driver – Update Single Column in a single document

    Below program shows you how to use $set in java program to make sure you are updating a single matching document.

    For simplicity, test data before and after update is added as comments in the program itself.

    MongoDBUpdateExample.java

    
package com.journaldev.mongodb.main;

import java.net.UnknownHostException;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.WriteResult;

public class MongoDBUpdateExample {

	public static void main(String[] args) throws UnknownHostException {

		MongoClient mongo = new MongoClient("localhost", 27017);
		DB db = mongo.getDB("journaldev");
		
		DBCollection col = db.getCollection("Persons");
		
		/**
		 * Test Data - Before update
		 * > db.Persons.find()
			{ "_id" : 123, "name" : "Pankaj", "country" : "USA" }
			{ "_id" : 456, "name" : "David", "country" : "USA" }
			{ "_id" : 789, "name" : "Lisa", "country" : "India" }
		   > 
		 */
		
		//Update single field in a single document
		DBObject query = new BasicDBObject("name", "Pankaj");
		DBObject update = new BasicDBObject();
		update.put("$set", new BasicDBObject("country","India"));
		
		WriteResult result = col.update(query, update);
		
		/**
		 * Test Data - After update
		 * > db.Persons.find()
			{ "_id" : 123, "name" : "Pankaj", "country" : "India" }
			{ "_id" : 456, "name" : "David", "country" : "USA" }
			{ "_id" : 789, "name" : "Lisa", "country" : "India" }
		   > 
		 */
		
		mongo.close();
				
	}

}

  2. MongoDB Update Java Driver – Update multiple columns

    We can add multiple fields in the MongoDB Update Document to update multiple columns in a single document.

    
package com.journaldev.mongodb.main;

import java.net.UnknownHostException;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.WriteResult;

public class MongoDBUpdateExample {

	public static void main(String[] args) throws UnknownHostException {

		MongoClient mongo = new MongoClient("localhost", 27017);
		DB db = mongo.getDB("journaldev");
		
		DBCollection col = db.getCollection("Persons");
		
		/**
		 * Test Data - Before update
		 * > db.Persons.find()
			{ "_id" : 123, "name" : "Pankaj", "country" : "India" }
			{ "_id" : 456, "name" : "David", "country" : "USA" }
			{ "_id" : 789, "name" : "Lisa", "country" : "India" }
		   > 
		 */
		
		//Update multiple field in a single document
		DBObject query = new BasicDBObject("name", "David");
		DBObject update = new BasicDBObject();
		update.put("$set", new BasicDBObject("country","India").append("name", "David New"));
		
		WriteResult result = col.update(query, update);
		
		/**
		 * Test Data - After update
		 * > db.Persons.find()
			{ "_id" : 123, "name" : "Pankaj", "country" : "India" }
			{ "_id" : 456, "name" : "David New", "country" : "India" }
			{ "_id" : 789, "name" : "Lisa", "country" : "India" }
		   > 
		 */
		
		mongo.close();
				
	}

}

  3. MongoDB Update Java Driver – Add a new field in a single document

    Again we can use $set to add a new field in MongoDB document using update query.

    
package com.journaldev.mongodb.main;

import java.net.UnknownHostException;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.WriteResult;

public class MongoDBUpdateExample {

	public static void main(String[] args) throws UnknownHostException {

		MongoClient mongo = new MongoClient("localhost", 27017);
		DB db = mongo.getDB("journaldev");
		
		DBCollection col = db.getCollection("Persons");
		
		/**
		 * Test Data - Before update
		 * > db.Persons.find()
			{ "_id" : 123, "name" : "Pankaj", "country" : "India" }
			{ "_id" : 456, "name" : "David New", "country" : "India" }
			{ "_id" : 789, "name" : "Lisa", "country" : "India" }
		   > 
		 */
		
		//Add a new field in a single document
		DBObject query = new BasicDBObject("_id", 123);
		DBObject update = new BasicDBObject();
		update.put("$set", new BasicDBObject("city","San Jose"));
		
		WriteResult result = col.update(query, update);
		
		/**
		 * Test Data - After update
		 * > db.Persons.find()
			{ "_id" : 123, "name" : "Pankaj", "country" : "India", "city" : "San Jose" }
			{ "_id" : 456, "name" : "David New", "country" : "India" }
			{ "_id" : 789, "name" : "Lisa", "country" : "India" }
		   > 
		 */
		
		mongo.close();
				
	}

}

  4. MongoDB Update Java Driver – Update subdocument

    Just like shell commands, we can use dot operator with $set to update sub-documents using update query.

    
package com.journaldev.mongodb.main;

import java.net.UnknownHostException;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.WriteResult;

public class MongoDBUpdateExample {

	public static void main(String[] args) throws UnknownHostException {

		MongoClient mongo = new MongoClient("localhost", 27017);
		DB db = mongo.getDB("journaldev");
		
		DBCollection col = db.getCollection("Persons");
		
		/**
		 * Test Data - Before update
		 * > db.Persons.find()
			{ "_id" : 100, "name" : "Pankaj", "address" : { "city" : "San Jose", "country" : "USA" } }
		   > 
		 */
		
		//Update sub-document in a single document
		DBObject query = new BasicDBObject("_id", 100);
		DBObject update = new BasicDBObject();
		update.put("$set", new BasicDBObject("address.city","Santa Clara"));
		
		WriteResult result = col.update(query, update);
		
		/**
		 * Test Data - After update
		 * > db.Persons.find()
			{ "_id" : 100, "name" : "Pankaj", "address" : { "city" : "Santa Clara", "country" : "USA" } }
		   > 
		 */
		
		mongo.close();
				
	}

}

  5. MongoDB Update Java Driver – Remove a field

    We use $unset update option to remove a field from MongoDB document, we can remove fields from subdocument too.

    
package com.journaldev.mongodb.main;

import java.net.UnknownHostException;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.WriteResult;

public class MongoDBUpdateExample {

	public static void main(String[] args) throws UnknownHostException {

		MongoClient mongo = new MongoClient("localhost", 27017);
		DB db = mongo.getDB("journaldev");
		
		DBCollection col = db.getCollection("Persons");
		
		/**
		 * Test Data - Before update
		 * > db.Persons.find()
			{ "_id" : 100, "name" : "Pankaj", "address" : { "city" : "Santa Clara", "country" : "USA" } }
		   > 
		 */
		
		//Remove a field in a single document
		DBObject query = new BasicDBObject("_id", 100);
		DBObject update = new BasicDBObject();
		update.put("$unset", new BasicDBObject("address.city",""));
		
		WriteResult result = col.update(query, update);
		
		/**
		 * Test Data - After update
		 * > db.Persons.find()
			{ "_id" : 100, "name" : "Pankaj", "address" : { "country" : "USA" } }
		   > 
		 */
		
		mongo.close();
				
	}

}

  6. MongoDB Update Java Driver – Insert a new document if no match found

    We need to pass upsert parameter value as true for this, an example is shown below.

    
package com.journaldev.mongodb.main;

import java.net.UnknownHostException;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.WriteResult;

public class MongoDBUpdateExample {

	public static void main(String[] args) throws UnknownHostException {

		MongoClient mongo = new MongoClient("localhost", 27017);
		DB db = mongo.getDB("journaldev");
		
		DBCollection col = db.getCollection("Persons");
		
		/**
		 * Test Data - Before update
		 * > db.Persons.find()
			{ "_id" : 100, "name" : "Pankaj", "address" : { "country" : "USA" } }
		   > 
		 */
		
		//insert document if no match found
		DBObject query = new BasicDBObject("name", "Lisa");
		DBObject update = new BasicDBObject();
		update.put("$set", new BasicDBObject("city","San Jose"));
		
		WriteResult result = col.update(query, update, true, false);
		
		/**
		 * Test Data - After update
		 * > db.Persons.find()
			{ "_id" : 100, "name" : "Pankaj", "address" : { "country" : "USA" } }
			{ "_id" : ObjectId("54020800cc59ebd19e1adebc"), "name" : "Lisa", "city" : "San Jose" }
		   > 
		 */
		
		mongo.close();
				
	}

}

  7. MongoDB Update Java Driver – Update multiple documents

    MongoDB Java Driver API provides updateMulti method that we can use to update multiple documents, in below example we are updating all the documents salary by 1000 where it’s less than 9000. This is also one of the example of $inc update option.

    
package com.journaldev.mongodb.main;

import java.net.UnknownHostException;

import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBObject;
import com.mongodb.MongoClient;
import com.mongodb.WriteResult;

public class MongoDBUpdateExample {

	public static void main(String[] args) throws UnknownHostException {

		MongoClient mongo = new MongoClient("localhost", 27017);
		DB db = mongo.getDB("journaldev");
		
		DBCollection col = db.getCollection("Persons");
		
		/**
		 * Test Data - Before update
		 * > db.Persons.find()
			{ "_id" : ObjectId("5402088bb1e38e3716f7911a"), "name" : "Pankaj", "salary" : 5000 }
			{ "_id" : ObjectId("5402088bb1e38e3716f7911b"), "name" : "David", "salary" : 10000 }
			{ "_id" : ObjectId("5402088bb1e38e3716f7911c"), "name" : "Lisa", "salary" : 8000 }
		   > 
		 */
		
		//Update multiple document - $inc example
		DBObject query = new BasicDBObject("salary", new BasicDBObject("$lt", 9000));
		DBObject update = new BasicDBObject();
		update.put("$inc", new BasicDBObject("salary",1000));
		
		WriteResult result = col.updateMulti(query, update);
		
		/**
		 * Test Data - After update
		 * > db.Persons.find()
			{ "_id" : ObjectId("5402088bb1e38e3716f7911a"), "name" : "Pankaj", "salary" : 6000 }
			{ "_id" : ObjectId("5402088bb1e38e3716f7911b"), "name" : "David", "salary" : 10000 }
			{ "_id" : ObjectId("5402088bb1e38e3716f7911c"), "name" : "Lisa", "salary" : 9000 }
		   > 
		 */
		
		mongo.close();
				
	}

}

That’s all for MongoDB Update document examples using Mongo shell as well as MongoDB java driver, do let me know if you face any problems with it.

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Pankaj

I love Open Source technologies and writing about my experience about them is my passion.

Comments

  2. Keya says:
    January 18, 2018 at 9:09 pm

    Hi,

    I am looking for help with my mongodb update query where I am using “inc” operator and the value by which a property has to be incremented is actually another property value in the same document.

    Let’s say a document has 2 properties score and bonus. I want to set score value as (score – bonus)

    { score: {$inc: $bonus } }

    But I am unable to do so. Can you please guide me about how to do the same in correct way?

    Thanks & Regards,
    Keya

    Reply
  4. Urvee says:
    March 9, 2017 at 11:15 pm

    Can you post an example of how to upsert a record based on multiple keys using MongoDB Driver and Spring?

    Reply
  6. Sri says:
    September 9, 2016 at 5:57 am

    Would like to know is there any limitation in executing the update() on the Mongo Documents. Limitations in the sense – Performance issue, when update is triggered (or) only some volume of records can be updated, etc.

    Reply
  8. anil says:
    April 29, 2016 at 3:29 pm

    a quick help.. how to add a new subdocument (array) to an existing document.

    I have already added a document by doing this

    collection.insertOne(new Document().append(“name”, “jones”));

    now I need to add a subdocument movieList to this document

    I have created a movielist array by doing something like this

    List movieList = new ArrayList();
    movieList.add(“Castlevania”);
    movieList.add(“Shangai”);

    when I do

    collection.updateOne(Filters.eq(“name”, “jones”), Updates.set(“movies”, movieList));

    I get an error
    Exception in thread “main” org.bson.codecs.configuration.CodecConfigurationException: Can’t find a codec for class java.util.ArrayList.

    any help ?

    Reply
    1. Jen says:
      October 16, 2018 at 11:02 am

      Add toString() method to the end of your movieList. However if you want to update each element within the list, you need to iterate over the list, and
      update each nested item.

      Reply
  10. Nanda says:
    April 7, 2016 at 1:31 am

    Good post and its very useful. How to update document based on particular field like may be _id or email etc.

    Reply
  12. Sudhir says:
    October 10, 2015 at 3:21 am

    Thanks for this great tutorial

    Reply
  14. Sudhir says:
    October 10, 2015 at 2:40 am

    Very thankful for this tutorial

    Reply
  16. Richard says:
    September 14, 2015 at 4:29 am

    Would be nice to see the Java driver examples working with the new 3.0+ release.

    Reply
  18. Hazekul Alam says:
    October 24, 2014 at 5:48 am

    Need an example on mongodb+spring+lazy loading.

    Reply

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