Apple WebObjects 5 Instrukcja Użytkownika Strona 25
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What Is an Enterprise Object?
25
Apple Computer, Inc. January 2002
CHAPTER 3
3 Enterprise Objects
As mentioned in “What Is WebObjects?” (page 13), WebObjects applications gain
much of their usefulness by interacting with a persistent data store, that is, a
datasource, which is usually a database. In WebObjects, database tables are
represented as collections of Java classes called
enterprise objects
. Enterprise
objects contain the bulk of your application’s
business logic
, the part of the
application you write regardless of which of the four approaches you take.
This chapter introduces enterprise objects, describes how they map to a database,
outlines how WebObjects supports and interacts with them, and enumerates the
advantages of the Enterprise Objects approach over other approaches available in
the industry. You may wish to read the first section,“What Is an Enterprise Object?”
(page 25), and the last section, “The Enterprise Objects Advantage” (page 34), and
skip the rest of the chapter, which is written for those familiar with relational
databases.
What Is an Enterprise Object?
An enterprise object is like any other object in that it couples data with the methods
for operating on that data. However, an enterprise object class has certain
characteristics that distinguish it from other classes:
■ It has properties that map to stored or persistent data; an enterprise object
instance typically corresponds to a single row or record in a database table.
■ It knows how to interact with other parts of WebObjects to give and receive
values for its properties. This is done through a mechanism known as key-value
coding, which enables the setting and getting of these properties.
- WebObjects Overview 1
- Contents 3
- CONTENTS 4
- Figures and Tables 7
- FIGURES AND TABLES 8
- 1 About This Book 9
- Further Investigations 10
- Online Documentation 11
- 2 What Is WebObjects? 13
- CHAPTER 2 16
- Java Client Applications 17
- Rapid Development 19
- The WebObjects Advantage 20
- State Management 21
- 3 Enterprise Objects 25
- CHAPTER 3 26
- Paradigm 28
- 34
- 4 HTML-Based Applications 37
- CHAPTER 4 38
- Dynamic Elements 39
- Reusing Components 40
- Maintaining State 41
- The WebObjects Architecture 43
- Project Builder 45
- WebObjects Builder 46
- 5 Direct to Web Applications 49
- CHAPTER 5 50
- Figure 5-2 A query-all page 50
- Figure 5-3 A query page 51
- Figure 5-4 A list page 52
- Figure 5-5 An inspect page 52
- Figure 5-6 An edit page 53
- Figure 5-8 The menu header 54
- How Direct to Web Works 55
- The Direct to Web Assistant 58
- Figure 5-15 The Rule Editor 61
- Limitations 63
- 6 WebObjects Desktop 65
- Applications 65
- Java Client Features 66
- Better User Experience 67
- Object Distribution 67
- The Best of WebObjects 67
- Deployment Options 68
- Rapid Application Development 68
- When To Choose Java Client 69
- CHAPTER 6 70
- Two Approaches to Java Client 71
- Choosing an Approach 74
- Java Client Architecture 76
- 78 Java Client Architecture 78
- Managing the User Interface 79
- Development Tasks and Tools 83
- 7 J2EE Integration 87
- Enterprise JavaBeans 88
- JSP and Servlets 89
- 8 Choosing Your Approach 91
- User Interface Requirements 92
- CHAPTER 8 93
- Combining Approaches 94
- Adding Rapid Development 95
- Where to Go From Here 96
- 9 Glossary 97
- GLOSSARY 100
- Glossary 102
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