Book Image

Enterprise Application Development with Ext JS and Spring

By : Gerald Gierer
Book Image

Enterprise Application Development with Ext JS and Spring

By: Gerald Gierer

Overview of this book

Spring and Ext JS are cutting edge frameworks that allow us to build high performance web applications for modern devices, that are now consuming data at a faster rate than ever before. It is the appropriate time for you to understand how to best leverage these technologies when architecting, designing, and developing large scale web development projects. This practical guide condenses an approach to web development that was gained from real world projects, and outlines a simple, practical approach to developing high performance, and enterprise grade web applications. Starting with configuring Java, NetBeans, and MySQL to prepare your development environment, you will then learn how to connect your NetBeans IDE to the MySQL database server. We will then explore the Task Time Tracker (3T) project database structure and populate these tables with test data. Following on from this, we will examine core JPA concepts after reverse engineering the domain layer with NetBeans. Leveraging the Data Access Object design pattern, you will learn how to build the Java DAO implementation layer assisted by generics in base classes, followed by a Data Transfer Object enabled service layer to encapsulate the business logic of your 3T application. The final chapters that focus on Java explore how to implement the request handling layer using Spring annotated controllers, and deploy the 3T application to the GlassFish server. We will then configure the Ext JS 4 development environment and introduce key Ext JS 4 concepts, including MVC and practical design conventions. Covering a variety of important Ext JS 4 strategies and concepts, you will be fully-equipped to implement a variety of different user interfaces using the Ext JS MVC design pattern. Your journey ends by exploring the production build and deployment process using Maven, Sencha Cmd and GlassFish.
Table of Contents (22 chapters)
Enterprise Application Development with Ext JS and Spring
About the Author
About the Reviewers
Introducing Spring Data JPA

Introducing the Java Persistence Query Language

Everyone reading this book should be familiar with SQL queries and how they work. Constructing a simple query against the ttt_company table to retrieve all records would look something like:

select * from ttt_company

Restricting the result set to companies starting with G would look like the following code line:

select * from ttt_company where company_name like "G%"

In JPA, we are dealing with entities and relationships between entities. The Java Persistence Query Language (JPQL) is used to formulate queries in a similar way to SQL. The previously mentioned statement will be written in JPQL as follows:

SELECT c FROM Company c

And the statement that follows is written as such:

SELECT c FROM Company c WHERE c.companyName LIKE 'G%'

The following are the major differences between SQL and JPQL:

  • JPQL class and field names are case sensitive. When we are dealing with classes, the class name must start with an uppercase letter. All the fields must have the...