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Tag Archives: MongoDB

How to create a pub/sub application with MongoDB ? Introduction

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In this article we will see how to create a pub/sub application (messaging, chat, notification), and this fully based on MongoDB (without any message broker like RabbitMQ, JMS, … ). So, what needs to be done to achieve such thing: an application “publish” a message. In our case, we simply save a document into MongoDB another application, or thread, subscribe ...

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Creating a REST API with Spring Boot and MongoDB

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Spring Boot is an opinionated framework that simplifies the development of Spring applications. It frees us from the slavery of complex configuration files and helps us to create standalone Spring applications that don’t need an external servlet container. This sounds almost too good to be true, but Spring Boot can really do all this. This blog post demonstrates how easy ...

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MongoDB Incremental Migration Scripts

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Introduction An incremental software development process requires an incremental database migration strategy. I remember working on an enterprise application where the hibernate.hbm2ddl.auto was the default data migration tool. Updating the production environment required intensive preparation and the migration scripts were only created on-the-spot. An unforeseen error could have led production data corruption. Incremental updates to the rescue The incremental database ...

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Integration testing done right with Embedded MongoDB

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Introduction Unit testing requires isolating individual components from their dependencies. Dependencies are replaced with mocks, which simulate certain use cases. This way, we can validate the in-test component behavior across various external context scenarios. Web components can be unit tested using mock business logic services. Services can be tested against mock data access repositories. But the data access layer is ...

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How to connect to MongoDB from a Java EE stateless application

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In this post I will present how to connect to MongoDB from a stateless Java EE application, to take advantage of the built-in pool of connections to the database offered by the MongoDB Java Driver. This might be the case if you develop a REST API, that executes operations against a MongoDB. Get the Java MongoDb Driver To connect from Java to ...

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Introduction to MongoDB Geospatial feature

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This post is a quick and simple introduction to Geospatial feature of MongoDB 2.6 using simple dataset and queries. Storing Geospatial Informations As you know you can store any type of data, but if you want to query them you need to use some coordinates, and create index on them. MongoDB supports three types of indexes for GeoSpatial queries:   ...

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Replica Set Members in Mongodb

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In the previous articles we have discussed many aspects of replica set in mongodb. And in those articles we have talked many things about members. So, what are these members? What is their purpose? Let us discuss about these things in this article. What are members in mongodb? In short terms the members in mongodb are the mongod processes which ...

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How to Use Projection in MongoDB?

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In mongodb, projection means selecting only necessary data rather than selecting the whole data of a document. If a document has 5 fields and you need to show only 3, then select only 3 fields from it. There are a few projection operators that mongodb provides and helps us reach that goal. Let us discuss about those operators in detail below. ...

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Evaluating persistent, replicated message queues

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Message queues are useful in a number of situations; for example when we want to execute a task asynchronously, we enqueue it and some executor eventually completes it. Depending on the use case, the queues can give various guarantees of message persistence and delivery. For some use-cases, it is enough to have an in-memory message queue. For others, we want ...

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