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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

Expressing SELECT statements

In this section, we will express/write via jOOQ DSL syntax a wide range of SELECT statements, including common projections, popular subqueries, scalar and correlated subqueries, unions, and row value expressions. We'll start with the commonly used projections.

Expressing commonly used projections

By commonly used projections, we understand the projections written against the well-known dummy table, DUAL. As you most probably know, the DUAL table is specific to Oracle; it's mostly unnecessary in MySQL (although jOOQ still renders it for MySQL 5.7 compatibility) and doesn't exist in PostgreSQL and SQL Server.

In this context, even if the SQL standard requires a FROM clause, jOOQ never requires such a clause and it renders the DUAL table whenever it is needed/supported. For example, selecting 0 and 1 can be done via the selectZero() and selectOne()methods (these statics are available in org.jooq.impl.DSL). The latter (selectOne())...

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