Book Image

jOOQ Masterclass

By : Anghel Leonard
Book Image

jOOQ Masterclass

By: Anghel Leonard

Overview of this book

jOOQ is an excellent query builder framework that allows you to emulate database-specific SQL statements using a fluent, intuitive, and flexible DSL API. jOOQ is fully capable of handling the most complex SQL in more than 30 different database dialects. jOOQ Masterclass covers jOOQ from beginner to expert level using examples (for MySQL, PostgreSQL, SQL Server, and Oracle) that show you how jOOQ is a mature and complete solution for implementing the persistence layer. You’ll learn how to use jOOQ in Spring Boot apps as a replacement for SpringTemplate and Spring Data JPA. Next, you’ll unleash jOOQ type-safe queries and CRUD operations via jOOQ’s records, converters, bindings, types, mappers, multi-tenancy, logging, and testing. Later, the book shows you how to use jOOQ to exploit powerful SQL features such as UDTs, embeddable types, embedded keys, and more. As you progress, you’ll cover trending topics such as identifiers, batching, lazy loading, pagination, and HTTP long conversations. For implementation purposes, the jOOQ examples explained in this book are written in the Spring Boot context for Maven/Gradle against MySQL, Postgres, SQL Server, and Oracle. By the end of this book, you’ll be a jOOQ power user capable of integrating jOOQ in the most modern and sophisticated apps including enterprise apps, microservices, and so on.
Table of Contents (26 chapters)
1
Part 1: jOOQ as a Query Builder, SQL Executor, and Code Generator
4
Part 2: jOOQ and Queries
11
Part 3: jOOQ and More Queries
16
Part 4: jOOQ and Advanced SQL
22
Part 5: Fine-tuning jOOQ, Logging, and Testing

Extending the jOOQ built-in DAO

Let's assume that you have configured the jOOQ generator to output the generated DAO layer in the jooq.generated.tables.daos package. While the generated DAO exposes common query methods such as insert(), update(), delete(), and a few specific queries of the fetchBy...() or fetchRange...() types, we want to extend it with our own query methods.

Important Note

This is one of my favorite ways of writing a DAO layer in a Spring Boot and jOOQ application.

The jOOQ DAO layer contains a set of generated classes that mirrors the database tables and extends the built-in org.jooq.impl.DAOImpl class. For example, the jooq.generated.tables.daos.SaleRepository class (or, jooq.generated.tables.daos.SaleDao if you keep the default naming strategy used by jOOQ) corresponds to the SALE table. In order to extend SaleRepository, we have to take a quick look at its source code and highlight a part of it as follows:

@Repository
public class SaleRepository...