Object Mapper in Java

This demonstrates how to use mapper to provide DAO's to access Cassandra

Contributors: Olivier Michallat, derived from here

Objectives

• To demonstrate how to use mapper to replace the tedious work DAO recreation in Java. Please refer here for more details on using object mapper.

Project Layout

• MapperApp.java - The main application file

How this Sample Works

The mapper interface is the top-level entry point to mapping features. It wraps a core driver session, and acts as a factory of DAO objects that will be used to execute requests. This app creates a top level mapper in the default keyspace killrvideo. This mapper interface acts as a factory to create and maintain the

• userDAO
• videoDAO

These two DAO's are used to interact with the Cassandra cluster.

Setup and Running

Prerequisites

• Java 8
• An Apache Cassandra(R) cluster is running and accessible through the contacts points and data center identified in application.conf

Running

e.g. To run this application use the following command:

mvn exec:exec

This will create a new keyspace killrvideo and many tables in the keyspace:

Insert rows into the users, videos and the other tables