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商品描述
Description:
Oracle Power Objects, a new product from Oracle first released in 1995 as part of the Workgroup 2000 initiative, is a cross-platform development tool that greatly simplifies the development of client/server database applications. With Power Objects, you can develop applications for Windows, Windows 95, Windows NT, and the Macintosh in a remarkably short amount of time; for example, you can build a master-detail application that can add, update, and select records via a user interface -- all in 30 seconds, with no coding!
This is the first book that covers Power Objects Version 2. It's an in-depth work, aimed at developers, that provides detailed information on getting the most from the product. It looks thoroughly at the most advanced features of Power Objects, covering specific application issues such as lists, reports (using both the native report writer and the Crystal Reports product), built-in methods, moving data, implementing drag-and-drop, etc. It also focuses on the use of object-oriented principles, global functions and messaging, OCXs, debugging, and cross-platform issues. The book also includes chapters on using PL/SQL with Power Object, and ways of integrating the World Wide Web with the product. It provides a wealth of developer tips and techniques, as well as understandable explanations of the internal workings of Power Objects. The accompanying diskette contains practical and complete examples that will help you build working applications, right now.
Table of
Contents:
Preface xi
I: Overview 1
1. Introducing Oracle Power Objects 3
The Challenges of Client/Server Computing 3
What is Oracle Power Objects? 5
OPO Fundamentals 9
Oracle Basic 18
The Version 2 Developer Interface 27
The Order Entry System 32
II: OPO and Data 33
2. Client-Side Data Issues 35
Using Data in a Client/Server System 36
Binding Data in Oracle Power Objects 37
Counter Objects 44
Master-Detail Relationships 47
Recordsets 54
Recordset Methods 56
Shared Recordsets 63
Standalone Recordsets 63
Fetch Modes 64
3. Server-Side Data Issues 71
Sessions 72
Transactions 83
Transactions and Locking 89
Transactions and RowFetchMode 94
Handling Lost Updates 97
EXEC SQL 108
4. Moving Data 115
Migrating Databases with the Migration Tool 116
Moving Data with Drag and Drop 121
Exporting Selected Rows 125
Importing Data From a File 140
Handling Import Errors 146
Delivering Feedback 151
Enhancing the Import Process 159
III: Global Issues 183
5. Built-In Methods 185
Open Form Example 186
Update and Insert Example 195
6. Global Variables, Functions, and Menus 217
Basic Variable Scoping 217
User-Defined Properties and Methods 223
Communicating with Methods 227
Implementing Menus, Toolbars, and Status Lines 231
7. Object Classes and Libraries 249
Libraries 250
Classes 255
Subclasses 273
IV: Creating Real Applications 291
8. Lists 293
List Boxes 294
Version 2-The New CSList Object 298
List Box Classes 306
Pick Lists 315
Creating a Quantity Form 323
9. Reports 345
Version 2 Reporting Tool Options 346
Using Views in OPO Reports 347
Constructing a Report with the OPO Report Writer 349
Coordinating Your Report with a
QBF Form 356
Reporting with Crystal Reports Pro v5.0 360
10. Implementing Drag and Drop 369
Drag and Drop Architecture 369
Mouse Methods 370
Of Mice and Clicks 372
Dropping over Fixed Objects 373
Dropping over Repeaters 374
Using Drag and Drop 374
11. Compiling and Debugging Applications 389
Compiling Applications 390
Deployment Options 392
Finding Errors 395
Trapping Run-Time Database Errors 406
Designing for Error-Free Operation 409
V: OPO and Beyond 413
12. PL/SQL 415
Why PL/SQL? 415
What is PL/SQL? 417
PL/SQL Syntax 417
The Structure of a PL/SQL Program 419
Packages 423
OPO and PL/SQL Procedures 424
13. Integrating the Web 433
All You Need to Know About the Internet 434
Accessing the Web Through Power Objects 436
OPO in the Web 449
Summing Up 453
Appendix: OPO Questions and Answers 455
Index 473