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
Matching MongoDB collection items by id?
To match collection items by id, use $in in MongoDB. Let us create a collection with documents −
> db.demo528.insertOne({"Name":"Chris",Age:21});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8b00d2ef4dcbee04fbbbe0")
}
> db.demo528.insertOne({"Name":"Bob",Age:22});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8b00d9ef4dcbee04fbbbe1")
}
> db.demo528.insertOne({"Name":"David",Age:20});{
"acknowledged" : true,
"insertedId" : ObjectId("5e8b00e0ef4dcbee04fbbbe2")
}Display all documents from a collection with the help of find() method −
> db.demo528.find();
This will produce the following output −
{ "_id" : ObjectId("5e8b00d2ef4dcbee04fbbbe0"), "Name" : "Chris", "Age" : 21 }
{ "_id" : ObjectId("5e8b00d9ef4dcbee04fbbbe1"), "Name" : "Bob", "Age" : 22 }
{ "_id" : ObjectId("5e8b00e0ef4dcbee04fbbbe2"), "Name" : "David", "Age" : 20 }Following is the query to match collection item by id −
> db.demo528.find({
_id: {$in:[ObjectId("5e8b00d2ef4dcbee04fbbbe0"),ObjectId("5e8b00e0ef4dcbee04fbbbe2")]}
});This will produce the following output −
{ "_id" : ObjectId("5e8b00d2ef4dcbee04fbbbe0"), "Name" : "Chris", "Age" : 21 }
{ "_id" : ObjectId("5e8b00e0ef4dcbee04fbbbe2"), "Name" : "David", "Age" : 20 }
Updated on: 13-May-2020
341 Views
Advertisements