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 count the number of documents in a MongoDB collection?
Following is the syntax to count the number of documents in a MongoDB collection
let anyVariableName= db.getCollection(‘yourCollectionName’); yourVariableName.count();
Let us first create a collection with documents
> db.countNumberOfDocumentsDemo.insertOne({"CustomerName":"Bob"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9a5e2015e86fd1496b38a1")
}
>db.countNumberOfDocumentsDemo.insertOne({"CustomerName":"Ramit","CustomerAge":23});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9a5e3515e86fd1496b38a2")
}
>db.countNumberOfDocumentsDemo.insertOne({"CustomerName":"Adam","CustomerAge":27,"CustomerCountryName":"US"});
{
"acknowledged" : true,
"insertedId" : ObjectId("5c9a5e4c15e86fd1496b38a3")
}Following is the query to display all documents from a collection with the help of find() method
> db.countNumberOfDocumentsDemo.find().pretty();
This will produce the following output
{ "_id" : ObjectId("5c9a5e2015e86fd1496b38a1"), "CustomerName" : "Bob" }
{
"_id" : ObjectId("5c9a5e3515e86fd1496b38a2"),
"CustomerName" : "Ramit",
"CustomerAge" : 23
}
{
"_id" : ObjectId("5c9a5e4c15e86fd1496b38a3"),
"CustomerName" : "Adam",
"CustomerAge" : 27,
"CustomerCountryName" : "US"
}Following is the query to count the number of documents in a MongoDB collection,
> let myCollectionName = db.getCollection('countNumberOfDocumentsDemo');
> myCollectionName.count();This will produce the following output
3
Updated on: 30-Jul-2019
423 Views
Advertisements