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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

The SQL USING and jOOQ onKey() shortcuts

So far, we've covered the typical JOINs that are commonly used in daily work. Before we continue with more types of JOINs, let's introduce two convenient shortcuts that are useful for expressing more concise JOINs.

SQL JOIN … USING

In certain cases, the SQL JOIN … USING clause can be a convenient alternative to the classical JOIN … ON clause. Instead of specifying a condition in the JOIN … ON clause, we enlist the JOIN … USING clause in the set of fields (columns) whose names are common to both tables – the left-hand side table and right-hand side table of a JOIN operation. In jOOQ, the USING clause is rendered via the using() method, as shown in the following example. The EMPLOYEE_NUMBER column mentioned in using() is the primary key of the EMPLOYEE table and the foreign key of the SALE table:

ctx.select(EMPLOYEE.FIRST_NAME, EMPLOYEE.LAST_NAME,    
  ...
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