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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

Derived tables

Have you ever used a nested SELECT (a SELECT in a table expression)? Of course, you have! Then, you've used a so-called derived table having the scope of the statement that creates it. Roughly, a derived table should be treated in the same way as a base table. In other words, it is advisable to give it and its columns meaningful names via the AS operator. This way, you can reference the derived table without ambiguity, and you'll respect the fact that most databases don't support unnamed (unaliased) derived tables.

jOOQ allows us to transform any SELECT in a derived table via asTable(), or its synonym table(). Let's have a simple example starting from this SELECT:

select(inline(1).as("one"));

This is not a derived table, but it can become one as follows (these two are synonyms):

Table<?> t = select(inline(1).as("one")).asTable();
Table<?> t = table(select(inline(1).as("one")));

In jOOQ, we...

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