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Free download page for Project OpenXava's pixia-club.info Framework for Rapid Development of Java Web applications. Allows to define. controller to make CRUD operations, to print in PDF format or to export to plain files .. list_count is in pixia-club.infoties of OpenXava, this is an example. Learn OpenXava by example EDITION LITE Javier Paniza iii About the book This book is meant to teach you how to develop Java Enterprise.


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Framework for Rapid Development of Java Web applications. page formats (landscape, portrait). There is an example at MovieReportAction of OpenXavaTest. Buy Learn OpenXava by example by Javier Paniza (eBook) online at Lulu. Visit the Lulu eBook (PDF), Pages Available in PDF Format.

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The goal of this book is to teach you how to develop Java Enterprise applications with OpenXava and other Java related technologies, tools and frameworks.

The way to achieve this goal is developing an application from scratch, step by step, until your application will be complete. And more important, you're going to learn techniques to solve common and advanced cases you'll face developing business applications.

Excellent book! By jln I found this book to be extremely well written for the following reasons: All in all, I'd strongly recommend this book to anyone who is looking for excellent how-to material about the relevant subject matter s. Posting Komentar. Minggu, 15 Juli [I OpenXava is a pragmatic solution to Enterprise Java development. It generates a lot of automatic stuff, but it is flexible enough to be useful developing real life business applications. At the end of the day you can develop applications just using simple Java classes with annotations.

In the next two chapters, you'll learn more details about the annotations you can use with OpenXava. Object-relational mapping allows you to access data in a relational database in an object-oriented fashion. In the Java applications you work only with objects. These objects are declared as persistent, and it's the JPA engine that is responsible for saving and reading objects from database to application. JPA mitigates the so-called impedance mismatch problem caused due to the inherent difference between the structure of a relational database and that of the object oriented applications.

A relational database structure consists of tables and columns with simple data whereas the object oriented applications have an absolutely different structure consisting of classes with references, collections, interfaces, inheritance, etc. In any Java application you use the Java classes for representing the business concept. You need to write a lot of SQL code to write the data from your objects to database and vice versa.

JPA does it for you. This chapter is an introduction to JPA. For a complete understanding of this standard technology, you would need a book dedicated to JPA. In fact, I have cited some of the books in the summary section of this chapter. Please skip this chapter, if you already know JPA. The first one is a set of Java annotations to add to your classes.

This is used to mark them as persistent and further give details about mapping the classes to the tables.

The second aspect is that of an API to read and write objects from your application. Let's look at the annotations first Entity In JPA nomenclature a persistent class is called an entity. In other words we can say that an entity is a class whose instances are saved in the database. Usually each entity represents a business concept of the domain. Listing 2. In fact in OpenXava entity is Figure 2. Entity properties are plain Java properties, with their respective getter and setter 2 methods listing 2.

If you do not want a property to be saved in the database you have to mark it listing 2. Note that we can not only annotate the field, but we can also annotate the getter if we want listing 2.

This rule applies to all JPA annotations. You can annotate the field field-base access or the getter property-base access. Do not mix the two styles in the same entity. You can see the use of these annotations in an already mentioned Customer entity in listing 2. You have to mark the id property and usually it maps to the table key can be used to indicate just the length without the column name 25 15 Chapter 2: Java Persistence API shown as 2. The length is used by the JPA engine for schema generation.

It's also used by OpenXava to know the size of the user interface editor. From the Customer entity of listing 2. Now, you know how to define basic properties in your entity. Let's learn how to declare relationships between entities using references and collections References An entity can reference another entity.

You only have to define a regular Java reference annotated with JPA annotation, just as in listing 2. The shown as 1 is to indicate that this reference is stored as a many-to-one database relationship between the table for Invoice and the table for Customer, using the INVCST shown as 3 column as foreign key. The shown as 3 is optional. That is at the given moment that you use the customer reference, for example if you call the method invoice.

It's advisable to always use lazy fetching. Inside a frame To create a new customer To modify the current customer Figure 2.

Other books: ARENA BOOK EXAMPLES

You have seen how to reference other entities. You can also reference other objects that are not entities, and even the embeddable objects Embeddable classes In addition to entities you can also use embeddable classes to model some concepts of your domain. If you have an entity A that has a reference to B, you would model B as an embeddable class when: You can say that A has B. A is deleted then B is also deleted.

B is not shared. Sometimes the same concept can be modeled as embeddable or as an entity. For example, the concept of an address. If the address is shared by several persons then you must use a reference to an entity, while if each person has his own address then an embeddable object is a good option.

Let's model an address as an embeddable class.

It's easy. Create a plain Java class and annotate it just as in listing 2. And now, creating a reference to Address from an entity is also easy. It's just a regular Java reference annotated listing 2. From a persistence viewpoint an embeddable object is stored in the same table as the container entity.

In this case the street, zipcode and city columns are in the table for Customer. Address has no table for itself. Figure 2. You only have to define a regular Java collection annotated listing 2. It's not possible to define a collection of embeddable objects in JPA at least for v1. Thus, when an Invoice is removed its details are removed too. We can say that an invoice has details. You have seen how to write your entities using JPA annotations and how OpenXava interprets them in order to generate a suitable user interface.

An EntityManager allows you to save, modify and search entities programmatically.

OpenXava Alternatives & Reviews

Too much of bureaucratic code. On the other hand OpenXava offers you a much more succinct way to do it listing 2. You don't need to close the manager, start and commit a transaction. This dirty work is taken care of by OpenXava for you. The code you see in listing 2. If you want to modify an existing entity you have to do so as shown in listing Listing 2.

No more In order to modify an object you only need to find and modify it. JPA is responsible for saving the changes to the database on transaction commit sometime sooner and OpenXava commits the JPA transaction automatically.

In listing 2. But JPA allows you to use queries as shown in the listing Listing 2. Unfortunately, many interesting things about JPA remains unsaid such as inheritance, polymorphism, composite keys, OneToOne relationships, ManyToMany relationship, unidirectional relationships, callback methods, advanced queries etc.

In fact, there are more than 60 annotations in JPA 1. We would need lot of time to learn all the details of JPA. Fortunately you will have the chance to learn some advanced JPA use cases while going through this book.

If you still want to learn more just read some other books and references.

Learn. OpenXava. by example EDITION 1.1 LITE Javier Paniza

JPA is an undisputed technology in the Java Enterprise universe. All the assets of knowledge and code around JPA is always a good investment.

Apart from the standard JPA annotations you have seen in this chapter, there are other useful annotations you can use in your entities.

Let's see them in the next chapter. In other words, it is the way to do declarative development in Java, where you refer to what and not the how part. In chapter 2 you have seen how to use the JPA annotations to do the objectrelational mapping. In this chapter you will see the annotations you can use inside an OpenXava application to define validations, user interface and some other aspects to fit your application to your needs.

The goal of this chapter is to introduce you to these annotations. On the other hand this chapter does not show you all the intricacies and use cases of all the annotations. The comprehensive coverage of all the annotations is out of the scope of this book. For example, you only have to mark a property listing 3.

Listing 3. A message is shown The user clicks on save The failed property is marked Figure 3. Annotation Apply on Property Checks if the property has a Property Allows you to define custom validation Entity Allows you to define a custom validation Entity Allows you to define a custom validation logic when removing Table 3. If the object is a Collection or an array, the elements are validated recursively.

If the object is a Map, the value elements are validated Property String Check whether the string conforms to the address Property Property numeric or string representation of a numeric Check whether the string is a well formated credit card number derivative of the Luhn algorithm Check whether the property is a number having up to integerdigits integer digits and fractionaldigits fractonal digits define column precision and Property string Check whether the string is a properly formated EAN or UPC-A code Table 3.

Built-in Hibernate validations. They can be used from OpenXava Custom validation It is very easy to add your own validation logic to your entity annotations allows you to indicate a class the validator with the validation logic. For example, if you want a custom logic to validate an unitprice property, you have to write something like the code in listing 3.Java classes with metadata Reusable validations to be used from business component declared there using annotations Controllers are related to classes of actions package.

Learn OpenXava by example

A controller is a collection of actions. This contrasts with a business component architecture where the software artifacts are organized around business concepts. How does this content violate the Lulu Membership Agreement? Over 7 years of experience in object oriented programming, design and development of Multi-Tier distributed, Enterprise applications using Java and J2EE technologies More information.

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