java barcode library The XML metadata format supports all possible Hibernate mapping options. in Java

Create Denso QR Bar Code in Java The XML metadata format supports all possible Hibernate mapping options.

Table 3.1
Draw QR Code 2d Barcode In Java
Using Barcode creation for Java Control to generate, create QR Code image in Java applications.
www.OnBarcode.com
Recognize QR-Code In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Hibernate and JPA comparison chart for chapter 3 (continued) Hibernate Core Java Persistence and EJB 3.0 JPA annotations cover all basic and most advanced mapping options. Hibernate Annotations are required for exotic mappings and tuning. Global metadata is only fully portable if declared in the standard orm.xml metadata file.
Create Code 3/9 In Java
Using Barcode encoder for Java Control to generate, create Code 39 Full ASCII image in Java applications.
www.OnBarcode.com
Generating PDF-417 2d Barcode In Java
Using Barcode generator for Java Control to generate, create PDF417 image in Java applications.
www.OnBarcode.com
The XML metadata format supports all possible Hibernate mapping options.
PDF-417 2d Barcode Drawer In Java
Using Barcode creator for Java Control to generate, create PDF417 image in Java applications.
www.OnBarcode.com
Create DataMatrix In Java
Using Barcode generator for Java Control to generate, create Data Matrix 2d barcode image in Java applications.
www.OnBarcode.com
XML mapping metadata can be defined globally, and XML placeholders are used to keep metadata free from dependencies.
Create Barcode In Java
Using Barcode printer for Java Control to generate, create Barcode image in Java applications.
www.OnBarcode.com
Printing Industrial 2 Of 5 In Java
Using Barcode creator for Java Control to generate, create 2/5 Standard image in Java applications.
www.OnBarcode.com
In the next part of the book, we show you all possible basic and some advanced mapping techniques, for classes, properties, inheritance, collections, and associations. You ll learn how to solve the structural object/relational mismatch.
QR-Code Maker In Java
Using Barcode drawer for Java Control to generate, create QR Code image in Java applications.
www.OnBarcode.com
Paint QR Code JIS X 0510 In VB.NET
Using Barcode generator for .NET framework Control to generate, create QR Code image in Visual Studio .NET applications.
www.OnBarcode.com
Part 2 Mapping concepts and strategies
Creating UCC.EAN - 128 In VB.NET
Using Barcode maker for .NET Control to generate, create GS1-128 image in .NET framework applications.
www.OnBarcode.com
Decode Barcode In Java
Using Barcode Control SDK for Eclipse BIRT Control to generate, create, read, scan barcode image in BIRT applications.
www.OnBarcode.com
his part is all about actual object/relational mapping, from classes and properties to tables and columns. 4 starts with regular class and property mappings, and explains how you can map fine-grained Java domain models. Next, in chapter 5, you ll see how to map more complex class inheritance hierarchies and how to extend Hibernate's functionality with the powerful custom mapping type system. In chapters 6 and 7, we show you how to map Java collections and associations between classes, with many sophisticated examples. Finally, you ll find chapter 8 most interesting if you need to introduce Hibernate in an existing applications, or if you have to work with legacy database schemas and hand-written SQL. We also talk about customized SQL DDL for schema generation in this chapter. After reading this part of the book, you ll be ready to create even the most complex mappings quickly and with the right strategy. You ll understand how the problem of inheritance mapping can be solved, and how collections and associations can be mapped. You ll also be able to tune and customize Hibernate for integration with any existing database schema or application.
Painting Barcode In None
Using Barcode creation for Online Control to generate, create Barcode image in Online applications.
www.OnBarcode.com
ANSI/AIM Code 128 Encoder In Objective-C
Using Barcode printer for iPad Control to generate, create Code 128 Code Set A image in iPad applications.
www.OnBarcode.com
Mapping persistent classes
Code39 Generation In Objective-C
Using Barcode creator for iPad Control to generate, create Code 3/9 image in iPad applications.
www.OnBarcode.com
ECC200 Generation In Objective-C
Using Barcode generator for iPad Control to generate, create Data Matrix 2d barcode image in iPad applications.
www.OnBarcode.com
This chapter covers
Code 3/9 Drawer In Objective-C
Using Barcode creator for iPhone Control to generate, create Code-39 image in iPhone applications.
www.OnBarcode.com
Draw GS1 128 In None
Using Barcode creator for Software Control to generate, create EAN / UCC - 13 image in Software applications.
www.OnBarcode.com
Understanding the entity and value-type concept Mapping classes with XML and annotations Fine-grained property and component mappings
Make DataMatrix In None
Using Barcode generator for Online Control to generate, create DataMatrix image in Online applications.
www.OnBarcode.com
Paint UCC-128 In Objective-C
Using Barcode creator for iPhone Control to generate, create GS1-128 image in iPhone applications.
www.OnBarcode.com
Mapping persistent classes
This chapter presents the fundamental mapping options, explaining how classes and properties are mapped to tables and columns. We show and discuss how you can handle database identity and primary keys, and how various other metadata settings can be used to customize how Hibernate loads and stores objects. All mapping examples are done in Hibernate s native XML format, and with JPA annotations and XML descriptors, side by side. We also look closely at the mapping of fine-grained domain models, and at how properties and embedded components are mapped. First, though, we define the essential distinction between entities and value types, and explain how you should approach the object/relational mapping of your domain model.
Understanding entities and value types
Entities are persistent types that represent first-class business objects (the term object is used here in its natural sense). In other words, some of the classes and types you have to deal with in an application are more important, which naturally makes others less important. You probably agree that in CaveatEmptor, Item is a more important class than String. User is probably more important than Address. What makes something important Let s look at the issue from a different perspective.
Fine-grained domain models
A major objective of Hibernate is support for fine-grained domain models, which we isolated as the most important requirement for a rich domain model. It s one reason why we work with POJOs. In crude terms, fine-grained means more classes than tables. For example, a user may have both a billing address and a home address. In the database, you may have a single USERS table with the columns BILLING_STREET, BILLING_CITY, and BILLING_ZIPCODE, along with HOME_STREET, HOME_CITY, and HOME_ZIPCODE. (Remember the problem of SQL types we discussed in chapter 1 ) In the domain model, you could use the same approach, representing the two addresses as six string-valued properties of the User class. But it s much better to model this using an Address class, where User has the billingAddress and homeAddress properties, thus using three classes for one table. This domain model achieves improved cohesion and greater code reuse, and it s more understandable than SQL systems with inflexible type systems. In
Copyright © OnBarcode.com . All rights reserved.