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Learning Spring Boot 3.0

Learning Spring Boot 3.0

By : Greg L. Turnquist
3.4 (14)
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Learning Spring Boot 3.0

Learning Spring Boot 3.0

3.4 (14)
By: Greg L. Turnquist

Overview of this book

Spring Boot 3 brings more than just the powerful ability to build secure web apps on top of a rock-solid database. It delivers new options for testing, deployment, Docker support, and native images for GraalVM, along with ways to squeeze out more efficient usage of existing resources. This third edition of the bestseller starts off by helping you build a simple app, and then shows you how to secure, test, bundle, and deploy it to production. Next, you’ll familiarize yourself with the ability to go “native” and release using GraalVM. As you advance, you’ll explore reactive programming and get a taste of scalable web controllers and data operations. The book goes into detail about GraalVM native images and deployment, teaching you how to secure your application using both routes and method-based rules and enabling you to apply the lessons you’ve learned to any problem. If you want to gain a thorough understanding of building robust applications using the core functionality of Spring Boot, then this is the book for you. By the end of this Spring Boot book, you’ll be able to build an entire suite of web applications using Spring Boot and deploy them to any platform you need.
Table of Contents (17 chapters)
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1
Part 1: The Basics of Spring Boot
3
Part 2: Creating an Application with Spring Boot
8
Part 3: Releasing an Application with Spring Boot
12
Part 4: Scaling an Application with Spring Boot

Using Query By Example to find tricky answers

So, what happens when the exact criteria for a query vary from request to request? In short, we need a way to feed Spring Data an object that captures the fields we’re interested in while ignoring the ones that we aren’t.

The answer is Query By Example.

Query By Example lets us create a probe, which is an instance of the domain object. We populate the fields with criteria we want to apply and leave the ones we aren’t interested in empty (null).

We then wrap the probe, creating an Example. Check out the following example:

VideoEntity probe = new VideoEntity();
probe.setName(partialName);
probe.setDescription(partialDescription);
probe.setTags(partialTags);
Example<VideoEntity> example = Example.of(probe);

The preceding code can be broken down as follows:

  • The first few lines are where we create the probe, presumably pulling down fields from a Spring MVC web method where they were posted, some...

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