Hibernate 3.2与Java Persistence权威指南：全面实战

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"《Java Persistence with Hibernate》是一本针对Hibernate 3.2的详尽指南，它是Hibernate in Action系列的全新修订版，旨在通过一个单一的应用示例深入讲解Java持久化技术。该书不仅全面介绍了Hibernate的核心概念，还涵盖了与之紧密结合的EJB 3.0 Java Persistence标准，以及Hibernate对其的实现方式。作者们，Christian Bauer、Gavin King和Gary Gregory，通过数百个例子，展示了各种基本和高级的Hibernate映射，包括适用于JDK 5.0的Java Persistence注解。本书的独特之处在于，所有示例均包含API使用、查询、数据获取策略、缓存、事务、对话管理等各个方面，并且提供多种版本供读者对比和评估Java Persistence新规范。无论是初次接触Hibernate的开发者，还是希望了解新标准和最新版Hibernate的资深用户，都能从中获益匪浅。书中内容丰富，权威实用，被誉为面向对象关系映射（ORM）在企业计算中的终极解决方案，适合Java持久化学习和参考。许多业界专家对此书给予了高度评价，比如来自Sun Microsystems的Meera Subbarao称其为应用Hibernate的必备之选，C#online.net的Patrick Peak认为它是Hibernate的权威来源，而ThoughtWorks的Ryan Daigle则强调了其在满足市场需求方面的重要性。读者Liz Hills甚至表示这是市场上最全面的Hibernate书籍，涵盖从映射到注解的方方面面。对于那些寻求深入理解和实践经验的读者，《Java Persistence with Hibernate》无疑是一本值得信赖的教材，无论是作为教程、参考书还是实战指南，都能帮助开发者快速掌握Java持久化技术，适应企业级应用的需求。"

CONTENTS xv

14.4 Naming and externalizing queries 359

Calling a named query 360

■

Defining queries in XML

metadata 360

■

Defining queries with annotations 361

Defining named queries programmatically 362

14.5 Query hints 363

Setting a timeout 364

■

Setting the flush mode 365

Setting read-only mode 365

■

Setting a fetch size 366

Setting an SQL comment 366

■

Named query hints 366

14.6 Summary 368

The query languages 369

15.1 Selection 370

Assigning aliases and query roots 371

■

Polymorphic

queries 372

15.2 Restriction 373

Comparison expressions 374

■

Expressions with

collections 378

■

Calling functions 380

Ordering query results 382

15.3 Projection 383

Projection of entities and scalar values 383

■

Using

dynamic instantiation 385

■

Getting distinct

results 387

■

Calling functions in projections 387

Aggregation functions 389

■

Grouping 391

15.4 Joins 392

Joins with SQL 393

■

Join options in JPA 395

Implicit association joins 395

■

Explicit joins 396

Dynamic fetching with joins 398

■

Theta-style

joins 401

■

Comparing identifiers 403

15.5 Subselects 404

Correlated and uncorrelated nesting 405

Quantification 406

15.6 Summary 407

Advanced query options 408

16.1 Transforming query results 409

Returning a list of lists 410

■

Returning a list of maps 410

Mapping aliases to bean properties 411

■

Writing a

ResultTransformer 412

16.2 Filtering collections 414

Licensed to Thomas Snead <[email protected]>

www.it-ebooks.info

xix

foreword to the first edition

Relational databases are indisputably at the core of the modern enterprise. While

modern programming languages, including Java, provide an intuitive, object-oriented

view of application-level business entities, the enterprise data underlying these entities

is heavily relational in nature. Further, the main strength of the relational model—

over earlier navigational models as well as over later

OODB models—is that by design

it is intrinsically agnostic to the programmatic manipulation and application-level view

of the data that it serves up. Many attempts have been made to bridge relational and

object-oriented technologies, or to replace one with the other, but the gap between

the two is one of the hard facts of enterprise computing today. It is this challenge—to

provide a bridge between relational data and Java objects—that Hibernate takes on

through its object/relational mapping (

ORM) approach. Hibernate meets this chal-

lenge in a very pragmatic, direct, and realistic way.

As Christian Bauer and Gavin King demonstrate in this book, the effective use of

ORM technology in all but the simplest of enterprise environments requires under-

standing and configuring how the mediation between relational data and objects is

performed. This demands that the developer be aware and knowledgeable both of the

application and its data requirements, and of the

SQL query language, relational stor-

age structures, and the potential for optimization that relational technology offers.

Not only does Hibernate provide a full-function solution that meets these require-

ments head-on, it is also a flexible and configurable architecture. Hibernate’s develop-

ers designed it with modularity, pluggability, extensibility, and user customization in

mind. As a result, in the few years since its initial release, Hibernate has rapidly become

one of the leading

ORM technologies for enterprise developers—and deservedly so.

Licensed to Thomas Snead <[email protected]>

www.it-ebooks.info

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