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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

Exploring jOOQ query types

jOOQ distinguishes between two main types of queries:

  • DML (INSERT, UPDATE, DELETE, and MERGE, among others) and DDL (CREATE, ALTER, DROP, RENAME, and similar) queries that produce a modification in the database
  • DQL (SELECT) queries that produce results

DML and DDL queries are represented in jOOQ by the org.jooq.Query interface, while DQL queries are represented by the org.jooq.ResultQuery interface. The ResultQuery interface extends (among others) the Query interface.

For instance, the following snippet of code contains two jOOQ queries:

Query query = ctx.query("DELETE FROM payment 
  WHERE customer_number = 103");
Query query = ctx.deleteFrom(PAYMENT)
  .where(PAYMENT.CUSTOMER_NUMBER.eq(103L));  

These queries can be executed via jOOQ and they return the number of affected rows:

int affectedRows = query.execute();

And, here are two result queries: first, a plain SQL query –...

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