- 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
Update elements inside an array in MongoDB?
To update elements inside an array, use $set in MongoDB. Let us create a collection with documents −
> db.demo494.insertOne( ... { ... ... "CollegeDetails" : [ ... { ... "CollegeName" : "MIT", ... "Fees" : 80000 ... }, ... { ... "CollegeName" : "SU", ... "Fees" : 90000 ... } ... ] ... } ... ) { "acknowledged" : true, "insertedId" : ObjectId("5e84a5c1b0f3fa88e22790c9") }
Display all documents from a collection with the help of find() method −
> db.demo494.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5e84a5c1b0f3fa88e22790c9"), "CollegeDetails" : [ { "CollegeName" : "MIT", "Fees" : 80000 }, { "CollegeName" : "SU", "Fees" : 90000 } ] }
Following is the query to update elements inside an array in MongoDB −
> db.demo494.update( ... ... { ... "CollegeDetails.CollegeName": "MIT" ... }, ... ... { ... $set: ... { ... "CollegeDetails.$.Fees" : 100000 ... } ... } ... ); WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })
Display all documents from a collection with the help of find() method −
> db.demo494.find().pretty();
This will produce the following output −
{ "_id" : ObjectId("5e84a5c1b0f3fa88e22790c9"), "CollegeDetails" : [ { "CollegeName" : "MIT", "Fees" : 100000 }, { "CollegeName" : "SU", "Fees" : 90000 } ] }
Advertisements