Java Data Objects : Java Ser. - David Jordan

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Java Data Objects

By: David Jordan

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Paperback | 9 May 2003

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360 Pages

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24.0 x 181.0 x 230.0

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"Java Data Objects" aims to revolutionize the way Java developers interact with databases and other datastores. It allows you to store and retrieve objects in a way that's natural toJava programmers. Instead of working with JDBC or EJB's container-managed persistence, you work directly with your Java objects. You don't have to copy data to and from database tables or issue SELECTs to perform queries: your JDO implementation takes care of persistence behind-the-scenes, and you make queries based on the fields of your Java objects, using normal Java syntax. The result is software that is truly object-oriented: not code that is partially object-oriented, with a large database-shaped lump on the back end. JDO lets you save plain, ordinary Java objects, and does not force you to use different data models and types for dealing with storage. As a result, your code becomes easier to maintain, easier to re-use, and easier to test. And you're not tied to a specific database vendor: your JDO code is entirely database-independent. You don't even need to know whether the datastore is a relational database, an object database, or just a set of files. The book offers a thorough introduction to JDO, starting with a simple application that demonstrates many of JDO's capabilities. It shows you how to make classes persistent, how JDO maps persistent classes to the database, how to configure JDO at runtime, how to perform transactions, and how to make queries. More advanced chapters cover optional features such as nontransactional access and optimistic transactions. The book concludes by discussing the use of JDO in web applications and J2EE environments.

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Non-Fiction Computing & I.T.Computer Programming & Software Development Object-Oriented Programming or OOP Web Programming Software Engineering Booktopia Publisher Services John Wiley & Sons Publishers UK

Foreword	p. xv
Preface	p. xvii
An Initial Tour	p. 1
Defining a Persistent Object Model	p. 2
The Classes to Persist	p. 3
Declaring Classes to Be Persistent	p. 7
Project Build Environment	p. 8
Jars Needed to Use the JDO Reference Implementation	p. 9
Project Directory Structure	p. 10
Enhancing Classes for Persistence	p. 10
Establish a Datastore Connection and Transaction	p. 11
Acquiring a PersistenceManager	p. 11
Creating a FOStore Datastore	p. 12
Operations on Instances	p. 14
Making Instances Persistent	p. 15
Accessing Instances	p. 18
Modifying an Instance	p. 22
Deleting Instances	p. 26
Summary	p. 27
An Overview of JDO Interfaces	p. 28
The javax.jdo Package	p. 28
JDO Exception Classes	p. 31
The javax.jdo.spi Package	p. 34
Optional Features	p. 35
Identity Options	p. 36
Optional Collections	p. 36
Transaction-Related Optional Features	p. 37
JDO Architectures	p. 38
Architecture Within Application JVM	p. 40
Single PersistenceManager	p. 40
Multiple PersistenceManagers Accessing the Same Datastore	p. 41
Multiple PersistenceManagers Accessing Different Datastores	p. 43
Shared Implementation Cache	p. 44
Datastore Access	p. 46
Direct Access of Filesystem or Local Datastore	p. 46
Remote Access of a JDO Server	p. 46
Remote Access of a SQL Datastore	p. 46
System Architectures with a JDO Application	p. 48
JDO Rich Client with Local Datastore	p. 48
JDO Applications in a Web Server	p. 48
JDO Applications as Web Services	p. 48
Rich Client Connecting to Application Server with EJB Components	p. 49
Web Server with EJB Server	p. 50
EJB Session Beans Using Session Bean Facades	p. 50
JDO Providing Container-Managed Persistence	p. 51
Defining Persistent Classes	p. 52
Kinds of Classes and Instances	p. 52
Kinds of Classes	p. 53
Kinds of Instances	p. 53
Java Classes and Metadata	p. 54
JDO Metadata	p. 55
Inheritance	p. 58
The Media Mania Object Model	p. 60
Fields	p. 63
Supported Types	p. 64
Persistence of Fields	p. 66
Complete Metadata for the Media Mania Model	p. 68
Datastore Mappings	p. 70
Mapping Approaches	p. 71
Relational Modeling Constructs	p. 72
SQL 99	p. 73
Modeling Constructs in Java and Relational Models	p. 74
Mapping Classes to Tables	p. 75
Mapping a Single-Valued Field to a Column	p. 76
Name-Mapping	p. 76
Type-Mapping	p. 77
Indexes	p. 78
Identity	p. 78
Inheritance	p. 80
References	p. 82
Collections and Relationships	p. 83
Using a Foreign Key	p. 83
Using a Join Table	p. 89
One-to-One Relationships	p. 90
Representing Lists and Maps	p. 92
Class Enhancement	p. 94
Enhancement Approaches	p. 95
Reference Enhancer	p. 96
Vendor-Specific Enhancement	p. 96
Binary Compatibility	p. 97
Enhancement Effects on Your Code	p. 98
Changes Made by the Enhancer	p. 98
Metadata	p. 99
Instance-Level Data	p. 100
Field Mediation	p. 101
Establishing a JDO Runtime Environment	p. 104
Configuring a PersistenceManagerFactory	p. 105
Connection Properties	p. 108
Optional Feature Properties	p. 110
Flags	p. 111
Flags Settings in Multiple Interfaces	p. 111
Determining the Optional Features and Default Flag Settings	p. 112
Vendor-Specific Properties	p. 115
Nonconfigurable Properties	p. 115
Acquiring a PersistenceManager	p. 115
User Object	p. 116
Closing a PersistenceManager	p. 116
Closing a PersistenceManagerFactory	p. 117
Transactions	p. 117
Properties of Transactions	p. 118
Transactions and Locking in the Datastore	p. 118
Types of Transactions in JDO	p. 121
Acquiring a Transaction	p. 121
Setting the Transaction Type	p. 122
Transaction Demarcation	p. 122
Restoring Values on Rollback	p. 125
Determining Whether a Transaction Is Active	p. 126
Multiple PersistenceManagers	p. 126
Multithreading	p. 126
Instance Management	p. 128
Persistence of Instances	p. 129
Explicit Persistence	p. 129
Persistence-by-Reachability	p. 131
Extent Access	p. 136
Accessing an Extent	p. 137
Extent Iteration	p. 137
Ignoring the Cache	p. 139
Accessing and Updating Instances	p. 139
Explicit Marking of Modified Instances	p. 141
Deleting Instances	p. 142
Delete Propagation	p. 143
The JDO Query Language	p. 145
Query Components	p. 146
Creating and Initializing a Query	p. 149
Changes in the Cache	p. 152
Query Namespaces	p. 153
Type Names	p. 153
Field, Parameter, and Variable Names	p. 154
Keywords	p. 154
Literals	p. 155
Query Execution	p. 155
Parameter Declarations	p. 155
Executing a Query	p. 156
Compiling a Query	p. 159
The Query Filter	p. 160
General Characteristics of Expressions	p. 161
Query Operators	p. 161
References	p. 166
Collections	p. 168
Ordering Query Results	p. 171
Closing a Query	p. 173
Identity	p. 174
Overview	p. 175
JDO Identity Types	p. 175
Metadata	p. 176
Identity Class	p. 177
Datastore Identity	p. 178
Application Identity	p. 179
Primary-Key Fields	p. 179
Persistent Class equals() and hashCode() Methods	p. 180
The Application-Identity Class	p. 180
A Single-Field Primary Key	p. 181
A Compound Primary Key	p. 184
A Compound Primary Key That Contains a Foreign Key	p. 187
Application Identity in an Inheritance Hierarchy	p. 190
Nondurable Identity	p. 195
Identity Methods	p. 196
Get the Identity Class	p. 197
Get the Identity of an Instance	p. 198
Getting an Instance via Its Identity	p. 200
Changing the Application Identity of an Instance	p. 202
Get the Current Application Identity of an Instance	p. 202
The String Representation of Identity	p. 203
Advanced Topics	p. 203
Choosing an Identity Type	p. 204
Using Identity Versus a Query	p. 204
Identity Across PersistenceManagers	p. 204
Lifecycle States and Transitions	p. 206
Lifecycle States	p. 206
Transient	p. 207
Persistent-New	p. 207
Hollow	p. 208
Persistent-Clean	p. 210
Persistent-Dirty	p. 210
Persistent-Deleted	p. 210
Persistent-New-Deleted	p. 210
State Interrogation	p. 211
State Transitions	p. 212
State Transitions During a Datastore Transaction	p. 212
State Transitions When a Transaction Completes	p. 213
States Between Transactions	p. 214
Field Management	p. 215
Transactional Fields	p. 215
Null Values	p. 215
Retrieval of Fields	p. 216
Default Fetch Group	p. 216
Retrieving All Fields	p. 217
The Management of Fields	p. 219
Serialization	p. 219
Managing Fields During Lifecycle Events	p. 220
First- and Second-Class Objects	p. 221
Specifying a Second-Class Object	p. 224
Embedding Collection Elements	p. 225
Persistent Classes as Second-Class Objects	p. 226
Sharing of Instances	p. 226
Cache Management	p. 228
Explicit Management of Instances in the Cache	p. 228
Refreshing Instances	p. 229
Evicting Instances	p. 229
Cloning	p. 230
Transient-Transactional Instances	p. 231
Transient-Transactional Lifecycle States	p. 231
State Interrogation	p. 232
State Transitions	p. 232
Making a Persistent Instance Transient	p. 233
Nontransactional Access	p. 235
Nontransactional Features	p. 235
Reading Outside a Transaction	p. 238
Persistent-Nontransactional State	p. 239
Retaining Values at Transaction Commit	p. 241
Restoring Values at Transaction Rollback	p. 242
Before Image	p. 243
Restoring Persistent Instances	p. 244
Restoring Persistent-New Instances	p. 244
Modifying Persistent Instances Outside a Transaction	p. 245
Hot Cache Example	p. 246
Optimistic Transactions	p. 251
Verification at Commit	p. 252
Recovery from a Failed Transaction	p. 253
Setting Optimistic Transaction Behavior	p. 254
Optimistic Example	p. 254
Optimistic Transaction State Transitions	p. 256
Deleting Instances	p. 257
Making Instances Transactional	p. 257
Modifying Instances	p. 257
Commit	p. 258
Rollback	p. 258
The Web-Server Environment	p. 259
Web Servers	p. 259
Accessing the PersistenceManagerFactory	p. 261
Servicing Requests	p. 263
PersistenceManager per Request	p. 264
PersistenceManager per Application	p. 264
PersistenceManager per Transactional Request	p. 265
PersistenceManager per Session	p. 265
Transactions	p. 265
JavaServer Pages	p. 266
Struts with JDO	p. 267
J2EE Application Servers	p. 272
Enterprise JavaBeans Architecture	p. 273
Stateless Session Beans	p. 274
Configuring the PersistenceManagerFactory	p. 275
Stateless Session Beans with Container-Managed Transactions	p. 278
Stateful Session Beans with Container-Managed Transactions	p. 280
Bean-Managed Transactions	p. 281
javax.transaction.UserTransaction	p. 282
javax.jdo.Transaction	p. 282
Stateless Session Beans with Bean-Managed Transactions	p. 283
Stateful Session Beans with Bean-Managed Transactions	p. 283
Message-Driven Beans	p. 283
Persistent Entities and JDO	p. 284
Local Persistent Storage	p. 284
Remote Persistent Storage	p. 286
Lifecycle States and Transitions	p. 293
JDO Metadata DTD	p. 296
JDO Interfaces and Exception Classes	p. 298
JDO Query Language BNF	p. 308
Source Code for Examples	p. 313
Index	p. 345
Table of Contents provided by Rittenhouse. All Rights Reserved.

Java Data Objects

At a Glance

Paperback

Shipping

How to return your order

Defective items

You Can Find This Book In

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