Deploying Polyglot (RDBMS + NoSQL) Applications on Openshift

Introduction Platform as a Service (PaaS) takes care of infrastructure, middleware, configuration and other platform related worries from developers and allows them to focus on their key competence, i.e. designing and developing their domain applications. In this article I am going to demonstrate how to build a “Polyglot Application” involving data storage and retrieval in…

Play! NoSQL (Building NoSQL applications with Play framework)

Accessing Databases with Play! Framework Play Framework is a high velocity web framework for Java and Scala. It’s built to make application development faster and glitch free. Play! provides a plugin for managing JDBC connection pools. So, if you’re working with relational databases, all you’ve to do is to define database connector dependencies in its build…

Marrying JPA with graph databases

For a month or two, I have been exploring Neo4J, a graph database built for storing huge amount of data. Other popular graph database, that I will be dwelling into is InfiniteGraph from Objectivity. I have also been working on Kundera (A JPA 2.0 based object-datastore mapping library for NoSQL datastores) as a key contributor. It already supports…

Composite Keys in Cassandra

Introduction A composite key consists of one or more primary key fields. Each field must be of data type supported by underlying data-store. In JPA (Java Persistence API), there are two ways of specifying composite keys: 1. Composite Primary Key: 2. Embedded Primary Key: Above Timeline entity is inspired from famous twissandra example. Starting 1.1 release, Cassandra supports…

Cross-datastore Persistence using Kundera

Introduction Kundera is a powerful JPA based object-datastore mapping library (ORM equivalent) for NoSQL databases. It significantly reduced programming effort required for performing CRUD operations in NoSQL databases. Kundera currently supports Cassandra, HBase, MongoDB and relational databases. Cross-datastore persistence is the latest additions to it feather. If your business objects are distributed across multiple databases,…

Data Model

Working with MongoDB using Kundera

Kundera – a JPA 2.0 (Java Persistence API) based ORM library was originally developed for Cassandra database. A support for Hbase was later added to it. Those who are new to Kundera, should read this to get a basic idea. For impatient ones – Get started with Kundera in 5 minutes! Kundera now supports MongoDB –…