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
Increment a property value of an element in array object with MongoDB
To increment a property value of an element, use update() in MongoDB and in that, work with #$inc to increment. Let us first create a collection with documents −
> db.demo97.insertOne({
... "Details": [
... {
... "Name": "Chris",
... "Marks": 45
... },
... {
... "Name": "Bob",
... "Marks": 88
... }y
... ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2d6d24b8903cdd865577af")
}Display all documents from a collection with the help of find() method −
> db.demo97.find();
This will produce the following output −
{ "_id" : ObjectId("5e2d6d24b8903cdd865577af"), "Details" : [ { "Name" : "Chris", "Marks" : 45 }, { "Name" : "Bob", "Marks" : 88 } ] }Following is the query to increment a property value of an element in array object −
> db.demo97.update(
... { "Details.Name": "Bob"},
... { $inc: { "Details.$.Marks" : 10 } }
... );
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Display all documents from a collection with the help of find() method −
> db.demo97.find();
This will produce the following output −
{ "_id" : ObjectId("5e2d6d24b8903cdd865577af"), "Details" : [ { "Name" : "Chris", "Marks" : 45 }, { "Name" : "Bob", "Marks" : 98 } ] }
Updated on: 30-Mar-2020
434 Views
Advertisements