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

jOOQ keyset pagination

Keyset (or seek) pagination doesn't have a default implementation in Spring Boot, but this shouldn't stop you from using it. Simply start by choosing a table's column that should act as the latest visited record/row (for instance, the id column), and use this column in the WHERE and ORDER BY clauses. The idioms relying on the ID column are as follows (sorting by multiple columns follows this same idea):

SELECT ... FROM ...
WHERE id < {last_seen_id}
ORDER BY id DESC
LIMIT {how_many_rows_to_fetch}
SELECT ... FROM ...
WHERE id > {last_seen_id}
ORDER BY id ASC
LIMIT {how_many_rows_to_fetch}

Or, like this:

SELECT ... FROM ...
WHERE ... AND id < {last_seen_id}
ORDER BY id DESC
LIMIT {how_many_rows_to_fetch}
SELECT ... FROM ...
WHERE ... AND id > {last_seen_id}
ORDER BY id ASC
LIMIT {how_many_rows_to_fetch}

Based on the experience gained so far, expressing these queries in jOOQ should be a piece of cake. For instance, let&apos...