Category
Sort By
We can create collections in mongoDb on which we can apply size limit. These special type of collections are called Capped Collections. These are a kind of circular queues, in which if allocated size limit is reached, it makes space for new documents by overwriting the oldest documents in the collection. How to create Capped...
MongoDB provides a rich set of aggregation. $group is one of them, with the help of $group, we can group documents (similar as group By in SQL). Lets understand by an example: Suppose we have following collection of blogs: [js] { userId:1, name:"Suroor", title:"AngularJS: Getting started with Directive", rating:3} { userId:2,...
MongoDB provides several ways of computing the average value of a group in a collection. One of the simplest ways of determining average is using the method db.collection.group(). The method db.collection.group() bunches the documents of a collection on the basis of the keys mentioned and executes aggregation functions on them. This...
In my previous post, I explained how to get started with node.js and executing your first script with node. Now in this tutorial, we will go a step ahead and learn using Expressjs and MongoDB. For people who are new, Express is a web application framework for node which provides a set of features that can be used to build single-page as...
In this post, we will learn how to use javascript as MongoDB shell script to export (fields of) a collection. If you just want to execute MongoDB commands then look at the another post there.. OK, so let's focus back to the objective of this post. Generally, to export data from a MongoDB collection, we use the...
MongoDB uses javascript interface for the shell commands. We can really use this feature in a great way - by writing the MongoDB (shell) commands in a javascript (.js file) and execute in single go. In this blog, I am going to show an example for the same: [javascript] print('===== My Demo Script ====='); ...
