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
Search an array of hashes in MongoDB?
Let us first create a collection with documents −
> db.searchAnArrayDemo.insertOne({_id:1,"TechnicalDetails":[{"Language":"MongoDB"}]});
{ "acknowledged" : true, "insertedId" : 1 }
> db.searchAnArrayDemo.insertOne({_id:2,"TechnicalDetails":[{"Language":"MySQL"}]});
{ "acknowledged" : true, "insertedId" : 2 }
> db.searchAnArrayDemo.insertOne({_id:3,"TechnicalDetails":[{"Language":"MongoDB"}]});
{ "acknowledged" : true, "insertedId" : 3 }
> db.searchAnArrayDemo.insertOne({_id:4,"TechnicalDetails":[{"Language":"MongoDB"}]});
{ "acknowledged" : true, "insertedId" : 4 }
> db.searchAnArrayDemo.insertOne({_id:5,"TechnicalDetails":[{"Language":"Java"}]});
{ "acknowledged" : true, "insertedId" : 5 }Following is the query to display all documents from a collection with the help of find() method −
> db.searchAnArrayDemo.find().pretty();
This will produce the following output −
{ "_id" : 1, "TechnicalDetails" : [ { "Language" : "MongoDB" } ] }
{ "_id" : 2, "TechnicalDetails" : [ { "Language" : "MySQL" } ] }
{ "_id" : 3, "TechnicalDetails" : [ { "Language" : "MongoDB" } ] }
{ "_id" : 4, "TechnicalDetails" : [ { "Language" : "MongoDB" } ] }
{ "_id" : 5, "TechnicalDetails" : [ { "Language" : "Java" } ] }Following is the query to search an array of hashes −
> db.searchAnArrayDemo.find({'TechnicalDetails.Language':'MongoDB'}).count();This will produce the following output −
3
Updated on: 30-Jul-2019
129 Views
Advertisements