R2DBC revealed : reactive relational database connectivity for Java and JVM programmers / Robert Hedgpeth.
Hedgpeth, Robert.
2021
QA76.9.D32
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Title
R2DBC revealed : reactive relational database connectivity for Java and JVM programmers / Robert Hedgpeth.
Author
Hedgpeth, Robert.
ISBN
9781484269893 (electronic bk.)
1484269896 (electronic bk.)
1484269888
9781484269886
DOI
https://doi.org/10.1007/978-1-4842-6989-3
Publication Details
[United States] : Apress, 2021.
Language
English
Description
1 online resource
Item Number
10.1007/978-1-4842-6989-3 doi
Call Number
QA76.9.D32
Dewey Decimal Classification
005.75/6
Summary
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 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. You will: 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.
Note
Includes index.
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Access limited to authorized users.
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R2DBC revealed.
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Intro
Table of Contents
About the Author
About the Technical Reviewer
Acknowledgments
The World at Scale
Introduction
Part I: The Reactive Movement and R2DBC
Chapter 1: The Case for Reactive Programming
A Traditional Approach
Imperative vs. Declarative Programming
Thinking Reactively
The Reactive Manifesto
Reactive Systems
Reactive Systems!= Reactive Programming
Asynchronous Data Streams
Data Streams
Back Pressure
Summary
Chapter 2: Introduction to R2DBC
What Is R2DBC?
A New Approach
Beyond JDBC
R2DBC Implementations

Embracing Reactive Programming
Enabling Vendor Creativity
Enforcing Compliance
Reactive Streams
Another Specification
API Fundamentals
Processors
JVM Interfaces
Implementations
Summary
Part II: The R2DBC Service-Provider Interface
Chapter 3: The Path to Implementation
The Database Landscape
Power in Simplicity
R2DBC Compliance
Guiding Principles
Specification Implementation Requirements
Specification Extensions
Wrapped Interfaces
Closeable Interfaces
Testing and Validation
Summary
Chapter 4: Connections
Establishing Connections

The Anatomy
R2DBC Hindsight
Connection Factory
Driver Implementations
Exposing Metadata
ConnectionFactories
Discovery
Bringing It All Together
Connections
Obtaining Connections
Acquiring Metadata
Validating Connections
Closing Connections
Summary
Chapter 5: Transactions
Transaction Fundamentals
The Need for Transactions
ACID Compliance
Methods of Control
Committing Transactions
Rolling Back Transactions
Savepoints
R2DBC Transaction Management
Auto-commit Mode
Explicit Transactions
Committing Transactions

Rolling Back Transactions
Managing Savepoints
Releasing Savepoints
Isolation Levels
Managing Isolation
Performance Considerations
Summary
Chapter 6: Statements
SQL Statements
R2DBC Statements
The Basics
Creating Statements
Running Statements
Sneak Peek
Dynamic Input
Creating Parameterized Statements
Binding Parameters
Batching Statements
Using Null Values
Auto-generated Values
Performance Hints
Summary
Chapter 7: Handling Results
The Fundamentals
Consuming Results
Cursors
Update Count
Rows and Columns
Row Anatomy

Retrieving Values
Generic Objects
Specifying Types
Multiple Columns
Summary
Chapter 8: Result Metadata
Data About Data
Row Metadata
Column Metadata
Required Methods
Optional Methods
getJavaType
getNativeTypeMetadata
getNullability
getPrecision
getScale
Retrieving Metadata
Obtaining a RowMetadata Object
Accessing ColumnMetadata
Summary
Chapter 9: Mapping Data Types
Data Type Differences
Mapping Simple Data Types
Character Types
Boolean Types
Binary Types
Numeric Types
DateTime Types
Collection Types

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