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jOOQ Masterclass

jOOQ Masterclass

By : Anghel Leonard
4.6 (5)
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jOOQ Masterclass

jOOQ Masterclass

4.6 (5)
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)
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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

Altering the jOOQ code generation process

We already know that jOOQ comes with three Code Generators (for Java, Scala, and Kotlin). For Java, we use org.jooq.codegen.JavaGenerator, which can be shaped/customized declaratively (or, programmatically) via a comprehensive set of configurations grouped under <configuration> (Maven), configurations (Gradle), or org.jooq.meta.jaxb.Configuration. But, sometimes, we need more control, or in other words, we need a custom generator implementation.

Implementing a custom generator

Imagine a scenario where we need a query method and it would be very handy if it was provided by the built-in jOOQ DAO. Obviously, the jOOQ goal is to maintain a thin DAO layer that avoids a large number of methods caused by different types of query combinations (don't expect to see in the default DAO a query method such as fetchByField1AndField2() since trying to cover all combinations of fields (even for only two fields) leads to a heavy DAO layer that...

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