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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

Simple fetching/mapping

By simple fetching/mapping, we refer to the jOOQ fetching techniques that you learned earlier in this book (for instance, the ubiquitous into() methods) but also to the new jOOQ utility, org.jooq.Records. This utility is available from jOOQ 3.15 onward, and it contains two types of utility methods, as we will discuss next.

Collector methods

The collector methods are named intoFoo(), and their goal is to create a collector (java.util.stream.Collector) for collecting records (org.jooq.Record[N]) into arrays, lists, maps, groups, and more. These collectors can be used in ResultQuery.collect() as any other collector. ResultQuery<R> implements Iterable<R> and comes with convenience methods such as collect() on top of it. Besides the fact that collect() handles resources internally (there is no need to use try-with-resources), you can use it for any collectors such as standard JDK collectors, jOOλ collectors, Records collectors, or your own...

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