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 set limit to $inc in MongoDB?
To set limit to $inc, use the below syntax −
db.yourCollectionName.update({yourFieldName : {$lt : yourValue}}, {$inc : {yourFieldName : yourIncrementValue}},false,true);Let us first create a collection with documents −
> db.limitIncrementDemo.insertOne({"StudentId":101,"StudentScore":95});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd2ce9eb64f4b851c3a13c3")
}
> db.limitIncrementDemo.insertOne({"StudentId":102,"StudentScore":55});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd2cea0b64f4b851c3a13c4")
}
> db.limitIncrementDemo.insertOne({"StudentId":103,"StudentScore":67});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd2cea1b64f4b851c3a13c5")
}
> db.limitIncrementDemo.insertOne({"StudentId":104,"StudentScore":56});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd2cea3b64f4b851c3a13c6")
}
> db.limitIncrementDemo.insertOne({"StudentId":105,"StudentScore":79});
{
"acknowledged" : true,
"insertedId" : ObjectId("5cd2cea4b64f4b851c3a13c7")
}Following is the query to display all documents from a collection with the help of find() method −
> db.limitIncrementDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cd2ce9eb64f4b851c3a13c3"),
"StudentId" : 101,
"StudentScore" : 95
}
{
"_id" : ObjectId("5cd2cea0b64f4b851c3a13c4"),
"StudentId" : 102,
"StudentScore" : 55
}
{
"_id" : ObjectId("5cd2cea1b64f4b851c3a13c5"),
"StudentId" : 103,
"StudentScore" : 67
}
{
"_id" : ObjectId("5cd2cea3b64f4b851c3a13c6"),
"StudentId" : 104,
"StudentScore" : 56
}
{
"_id" : ObjectId("5cd2cea4b64f4b851c3a13c7"),
"StudentId" : 105,
"StudentScore" : 79
}Following is the query to set limit to $inc −
> db.limitIncrementDemo.update({StudentScore : {$lt : 75}}, {$inc : {StudentScore : 10}},false,true);
WriteResult({ "nMatched" : 3, "nUpserted" : 0, "nModified" : 3 })Let us check all the documents from the above collection −
> db.limitIncrementDemo.find().pretty();
This will produce the following output −
{
"_id" : ObjectId("5cd2ce9eb64f4b851c3a13c3"),
"StudentId" : 101,
"StudentScore" : 95
}
{
"_id" : ObjectId("5cd2cea0b64f4b851c3a13c4"),
"StudentId" : 102,
"StudentScore" : 65
}
{
"_id" : ObjectId("5cd2cea1b64f4b851c3a13c5"),
"StudentId" : 103,
"StudentScore" : 77
}
{
"_id" : ObjectId("5cd2cea3b64f4b851c3a13c6"),
"StudentId" : 104,
"StudentScore" : 66
}
{
"_id" : ObjectId("5cd2cea4b64f4b851c3a13c7"),
"StudentId" : 105,
"StudentScore" : 79
}
Updated on: 30-Jul-2019
188 Views
Advertisements