iBATIS实战指南：从新手到精通

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"《iBATIS in Action》是一本详细介绍iBATIS技术的经典著作，作者包括CLINTON BEGIN、BRANDON GOODIN、LARRY MEADORS和MANNING。该书旨在帮助读者从iBATIS的初学者阶段逐步提升到熟练应用。书中内容涵盖了iBATIS的核心概念、配置、映射文件的编写、SQL查询的处理以及与Java应用程序的集成等关键知识点。 iBATIS是一个强大的对象关系映射（ORM）框架，它允许开发人员在Java应用程序中轻松地与数据库进行交互。通过《iBATIS in Action》，读者可以学习如何使用iBATIS的API来执行动态SQL查询，如何处理结果集，并了解如何利用其特性如延迟加载和批处理来优化性能。书中还会涉及iBATIS的工作原理，包括XML配置文件的结构和作用，以及如何使用预编译语句（PreparedStatement）来防止SQL注入攻击。此外，作者还将分享实战案例，让读者能够在实际项目中理解和应用所学知识。对于在线获取这本书或获取更多折扣信息，读者可以访问曼宁出版社的网站www.manning.com，或者通过邮件manning@manning.com联系特殊销售部门获取更多信息。版权方面，所有内容未经出版商Manning Publications事先书面许可，不得复制、存储或任何形式的传输。值得注意的是，书中会遵循保护知识产权的原则，许多制造商和供应商的产品名称被用作商标，如果在书中出现，通常会使用全大写或首字母大写的形式表示尊重。此外，为了确保文本的长期保存价值，曼宁出版社采用酸性纸张印刷策略，以减缓材料的老化过程。《iBATIS in Action》是一本深入浅出的指南，不仅适合希望掌握iBATIS技术的开发者阅读，也适合那些希望提升数据库操作效率和安全性的技术团队参考。"

CONTENTS xv

11.4 Creating your own DAO layer 262

Separating interface from implementation 263

Decoupling and creating a factory 263

11.5 Summary 266

Extending iBATIS 267

12.1 Understanding pluggable component design 268

12.2 Working with custom type handlers 269

Implementing a custom type handler 270

Creating a TypeHandlerCallback 271

Registering a TypeHandlerCallback for use 275

12.3 Working with a CacheController 276

Creating a CacheController 277

■

Putting, getting, and flushing a

CacheController 277

■

Registering a CacheController for use 278

12.4 Configuring an unsupported DataSource 279

12.5 Customizing transaction management 280

Understanding the TransactionConfig interface 281

Understanding the Transaction interface 282

12.6 Summary 283

PART 4 IBATIS RECIPES ...........................................285

iBATIS best practices 287

13.1 Unit testing with iBATIS 288

Unit-testing the mapping layer 288

■

Unit-testing data access

objects 291

■

Unit-testing DAO consumer layers 293

13.2 Managing iBATIS configuration files 295

Keep it on the classpath 295

■

Keep your files together 297

Organize mostly by return type 298

13.3 Naming conventions 298

Naming statements 298

■

Naming parameter maps 298

Naming result maps 299

■

XML files 299

13.4 Beans, maps, or XML? 300

JavaBeans 300

■

Maps 300

■

XML 301

■

Primitives 301

13.5 Summary 301

xviii PREFACE

I’m often asked, “Why didn’t you use other open source tools?” At the time

there were no other tools like i

BATIS. There were plenty of code generators, but

I’ll spare you my soapbox rant on development-time and build-time code genera-

tion. I’ll just say that anything that can be generated can also be generalized into a

framework. And that’s what i

BATIS essentially is: a generalized framework for

quicker

JDBC coding.

The next question often asked is, “Why not use an object/relational mapping

tool?” An

O/RM tool can be used in the right environment. It works very well

when you have full control over your database and the object model: you can eas-

ily achieve ideal mappings and avoid nightmarish tweaking and jumping through

hoops due to a mismatch between the two. However, no one would dream of map-

ping an object model to the kinds of databases that I usually work with. With a

decent

O/RM tool, like Hibernate or TopLink, you probably could. The question

is, should you map it?

Someone once told me a story about a guy with a hammer who saw everything

as a nail…you know the one.

O/RM tools are frameworks. Frameworks are built

on constraints and assumptions. Those constraints and assumptions are ideal in

certain environments, but not in all environments…not everything is a nail. Our

job as software developers is to match ideal solutions to the problems at hand—

not to use the only solution we know or the most popular solution or the hottest

solution on the Net—but the one that best solves the problem we are facing. For

different environments, we need different tools—i

BATIS is one of them.

Today i

BATIS has been implemented in three languages: Java, C#, and Ruby. It

is maintained by a team of more than a dozen developers and it has a community

of thousands of developers. You can read about it in books and articles and blogs

on the Web. While i

BATIS isn’t the top dog of persistence, and it likely never will

be, it is a success story. I realized that the day I stopped answering questions on

the mailing list: the community had taken over.

A self-sustaining community is the true mark of success of an open source

project. If you’ve read this far, I assume you’re part of that community. So let me

join you in celebrating the success of our little framework.

LINTON BEGIN

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