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

Hooking POJOs

You already know that jOOQ can generate POJOs on our behalf and it can handle user-defined POJOs, too. Moreover, you saw a significant number of mappings of a jOOQ result into POJOs (typically, via fetchInto()); therefore, this is not a brand new topic for you. However, in this section, let's take a step further and really focus on different types of POJOs that are supported by jOOQ.

If all we configure is <pojos>true</pojos> (here, Maven), then jOOQ generates POJOs with private fields, empty constructors, constructors with arguments, getters and setters, and toString(). However, jOOQ can also handle a very simple user-defined POJO such as this one:

public class SimplestCustomer { 
   public String customerName; 
   public String customerPhone; 
}

Here is a query that populates this POJO:

List<SimplestCustomer> result = ctx.select(
   CUSTOMER.CUSTOMER_NAME, CUSTOMER.PHONE.as("customerPhone...