- Trending Categories
- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- MS Excel
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP
- Physics
- Chemistry
- Biology
- Mathematics
- English
- Economics
- Psychology
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Combine update and query parts to form the upserted document in MongoDB?
You need to use $set operator along with upsert:true. Let us first create a collection with documents −
> db.updateWithUpsertDemo.insertOne({"StudentFirstName":"John","StudentAge":21}); { "acknowledged" : true, "insertedId" : ObjectId("5cd2a61c345990cee87fd890") } > db.updateWithUpsertDemo.insertOne({"StudentFirstName":"Larry","StudentAge":23}); { "acknowledged" : true, "insertedId" : ObjectId("5cd2a624345990cee87fd891") } > db.updateWithUpsertDemo.insertOne({"StudentFirstName":"David","StudentAge":24}); { "acknowledged" : true, "insertedId" : ObjectId("5cd2a62c345990cee87fd892") }
Following is the query to display all documents from a collection with the help of find() method −
> db.updateWithUpsertDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5cd2a61c345990cee87fd890"), "StudentFirstName" : "John", "StudentAge" : 21 } { "_id" : ObjectId("5cd2a624345990cee87fd891"), "StudentFirstName" : "Larry", "StudentAge" : 23 } { "_id" : ObjectId("5cd2a62c345990cee87fd892"), "StudentFirstName" : "David", "StudentAge" : 24 }
Following is the query to combine update and query parts to form the upserted document −
> db.updateWithUpsertDemo.update({_id: ObjectId("5cd2a624345990cee87fd891")},{"$set": {"StudentFirstName": "Chris"}}, {upsert:true}); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
Let us check whether the field “StudentFirstName” has been changed or not −
> db.updateWithUpsertDemo.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5cd2a61c345990cee87fd890"), "StudentFirstName" : "John", "StudentAge" : 21 } { "_id" : ObjectId("5cd2a624345990cee87fd891"), "StudentFirstName" : "Chris", "StudentAge" : 23 } { "_id" : ObjectId("5cd2a62c345990cee87fd892"), "StudentFirstName" : "David", "StudentAge" : 24 }
Advertisements