R2DBC Revealed

Reactive Relational Database Connectivity for Java and JVM Programmers

By: Robert Hedgpeth

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eText | 2 April 2021

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Understand the newest trend in database programming for developers working in Java, Kotlin, Clojure, and other JVM-based languages. This book introduces Reactive Relational Database Connectivity (R2DBC), a modern way of connecting to and querying relational databases from Java and other JVM languages. The book begins by helping you understand not only what reactive programming is, but why it is necessary. Then building on those fundamentals, the book takes you into the world of databases and the newly released Reactive Relational Database Connectivity (R2DBC) specification.

Examples in the book are worked using the freely available MariaDB database along with MariaDB's vendor-implementation of the R2DBC service-provider interface (SPI). Following along with the examples and the provided example code helps prepare you to work with any of the growing number of R2DBC implementations for popular enterprise databases such as Oracle Database and SQL Server. You'll be well prepared for what is becoming the future of database access from Java and other languages built on the JVM.

What You Will Learn

Understand why R2DBC was created and how it utilizes the Reactive Streams API
Understand the components of the R2DBC service-provider interface
Create and manage reactive database connections and connection pools using an R2DBC client
Programmatically execute queries on a relational database using an R2DBC client
Effectively utilize transactions using an R2DBC client
Build relational database-driven applications that are event-driven and non-blocking

Who This Book Is For

Software developers building solutions using JVM languages and the JVM ecosystem, and developers who need an introduction to the R2DBC specification and reactive programming with relational databases and want to understand what Reactive Relational Database Connectivity is and why it came about. This book includes practical examples of using the R2DBC specification with Java and MariaDB that will provide developers with the knowledge they need to create their own solutions.