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
How to increment inside the update() function in MongoDB?
You can use $inc operator to increment. Let us first create a collection with documents −
> db.addInUpdateFunctionDemo.insertOne({"PlayerName":"Chris","PlayerScore":78});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd2b3f4345990cee87fd893")
}
> db.addInUpdateFunctionDemo.insertOne({"PlayerName":"Robert","PlayerScore":88});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd2b3fc345990cee87fd894")
}
> db.addInUpdateFunctionDemo.insertOne({"PlayerName":"David","PlayerScore":99});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd2b407345990cee87fd895")
}Following is the query to display all documents from a collection with the help of find() method −
> db.addInUpdateFunctionDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cd2b3f4345990cee87fd893"),
"PlayerName" : "Chris",
"PlayerScore" : 78
}
{
"_id" : ObjectId("5cd2b3fc345990cee87fd894"),
"PlayerName" : "Robert",
"PlayerScore" : 88
}
{
"_id" : ObjectId("5cd2b407345990cee87fd895"),
"PlayerName" : "David",
"PlayerScore" : 99
}Following is the query to perform addition inside the update() function in MongDB −
> db.addInUpdateFunctionDemo.update({_id : ObjectId("5cd2b407345990cee87fd895")},{$inc: {PlayerScore: 201}});
WriteResult({ "nMatched" : 1, "nUpserted" : 0, "nModified" : 1 })Let us check all the documents once again −
> db.addInUpdateFunctionDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cd2b3f4345990cee87fd893"),
"PlayerName" : "Chris",
"PlayerScore" : 78
}
{
"_id" : ObjectId("5cd2b3fc345990cee87fd894"),
"PlayerName" : "Robert",
"PlayerScore" : 88
}
{
"_id" : ObjectId("5cd2b407345990cee87fd895"),
"PlayerName" : "David",
"PlayerScore" : 300
}
Updated on: 30-Jul-2019
197 Views
Advertisements