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
MongoDB query to get array of nested string?
To get array of nested string in MongoDB, use dot notation in find(). Let us create a collection with documents −
> db.demo89.insertOne(
... { id: 101, Details: [ { Name: "Chris", Marks: 45 }, { Name: "David", Marks: 55, Subjects : ["MySQL", "MongoDB", "Java", "C"] } ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2c163b79799acab037af51")
}
> db.demo89.insertOne(
... { id: 102, Details: [ { Name: "Mike", Marks: 48 }, { Name: "Bob", Marks: 98, Subjects : ["C++", "MySQL"] } ]
... }
... );
{
"acknowledged" : true,
"insertedId" : ObjectId("5e2c163c79799acab037af52")
}Display all documents from a collection with the help of find() method −
> db.demo89.find();
This will produce the following output −
{ "_id" : ObjectId("5e2c163b79799acab037af51"), "id" : 101, "Details" : [ { "Name" : "Chris", "Marks" : 45 }, { "Name" : "David", "Marks" : 55, "Subjects" : [ "MySQL", "MongoDB", "Java", "C" ] } ] }
{ "_id" : ObjectId("5e2c163c79799acab037af52"), "id" : 102, "Details" : [ { "Name" : "Mike", "Marks" : 48 }, { "Name" : "Bob", "Marks" : 98, "Subjects" : [ "C++", "MySQL" ] } ] }Following is the query to get array of nested string −
> db.demo89.find({ "Details.Subjects": "MongoDB"});This will produce the following output −
{ "_id" : ObjectId("5e2c163b79799acab037af51"), "id" : 101, "Details" : [ { "Name" : "Chris", "Marks" : 45 }, { "Name" : "David", "Marks" : 55, "Subjects" : [ "MySQL", "MongoDB", "Java", "C" ] } ] }
Updated on: 30-Mar-2020
206 Views
Advertisements