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

Regular functions

Being a SQL user, you've probably worked with a lot of regular or common SQL functions such as functions for dealing with NULL values, numeric functions, string functions, date-time functions, and so on. While the jOOQ manual represents a comprehensive source of information structured as a nomenclature of all the supported SQL built-in functions, we are trying to complete a series of examples designed to get you familiar with the jOOQ syntax in different scenarios. Let's start by talking about SQL functions for dealing with NULL values.

Just in case you need a quick overview about some simple and common NULL stuff, then quickly check out the someNullsStuffGoodToKnow() method available in the bundled code.

SQL functions for dealing with NULLs

SQL provides several functions for handling NULL values in our queries. Next, let's cover COALESCE(), DECODE(), IIF(), NULLIF(), NVL(), and NVL2() functions. Let's start with COALESCE().

COALESCE...