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Groovy 2 Cookbook

Groovy 2 Cookbook

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Groovy 2 Cookbook

Groovy 2 Cookbook

4.2 (12)

Overview of this book

Get up to speed with Groovy, a language for the Java Virtual Machine (JVM) that integrates features of both object-oriented and functional programming. This book will show you the powerful features of Groovy 2 applied to real-world scenarios and how the dynamic nature of the language makes it very simple to tackle problems that would otherwise require hours or days of research and implementation. Groovy 2 Cookbook contains a vast number of recipes covering many facets of today's programming landscape. From language-specific topics such as closures and metaprogramming, to more advanced applications of Groovy flexibility such as DSL and testing techniques, this book gives you quick solutions to everyday problems. The recipes in this book start from the basics of installing Groovy and running your first scripts and continue with progressively more advanced examples that will help you to take advantage of the language's amazing features. Packed with hundreds of tried-and-true Groovy recipes, Groovy 2 Cookbook includes code segments covering many specialized APIs to work with files and collections, manipulate XML, work with REST services and JSON, create asynchronous tasks, and more. But Groovy does more than just ease traditional Java development: it brings modern programming features to the Java platform like closures, duck-typing, and metaprogramming. In this new book, you'll find code examples that you can use in your projects right away along with a discussion about how and why the solution works. Focusing on what's useful and tricky, Groovy 2 Cookbook offers a wealth of useful code for all Java and Groovy programmers, not just advanced practitioners.
Table of Contents (17 chapters)
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Groovy 2 Cookbook
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
Index

Querying an SQL database


Usually data is more often read than it is written, and performing data queries is the most important task done by database-driven applications. The standard JDBC API is rather verbose and adds a lot of boilerplate code around actual queries. Groovy provides more elegance to the querying code by simplifying access and mapping logic.

This recipe contains a highlight of some of the methods you can use to query a database using Groovy.

Getting ready

As for the previous recipes from this chapter, we will use the DBUtil class defined in the Creating a database table recipe as well as the same database structure.

Considering that this recipe is about querying data, we need to populate our database first. The database population code is quite verbose, so we leave it out of this recipe and we ask the reader to refer to the accompanying code for this chapter. The DBUtil.groovy available in the download section has been refactored with two new methods:

  • createSchema: It triggers...

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