Tag: aggregation

mongodb March 12, 2015 2 min read by mkyong 10 comments

Spring Data MongoDB – Aggregation Grouping Example

In this tutorial, we will show you how to do the data grouping with Spring Data + MongoDB aggregation framework. 1. Test Data domain.json { "_id" : 1, "domainName" : "test1.com", "hosting" : "hostgator.com" } { "_id" : 2, "domainName" : "test2.com", "hosting" : "aws.amazon.com"} { "_id" : 3, "domainName" : "test3.com", "hosting" : "aws.amazon.com" […]

mongodb July 24, 2014 2 min read by mkyong 0 comments

MongoDB : write Aggregation result into a new collection

This article shows you 2 ways to export a MongoDB “aggregation” result into another new collection. 1. $out Example This $out operator is New in version 2.6. 1.1 Review a simple grouping example, it writes the result to a new variable “result”. > var result = db.hc_hosting.aggregate( { $group : { _id : "$hosting", total […]