Working with Files and Devices, Vii

Displaying Attributes of . a. .Field. . . . . . . . . . . . . . . . . .210. . . . . .

Equating a Name with a Field, Expression, or. . Command. . . . . . . . 210. . Source Debug National Language Support for .ILE. . RPG. . . . . . . 211. .

Sample Source for Debug Examples. . . . . . . . . . . . . . . . . . 211. . . . .

Chapter 12. Handling Exceptions	. . . . . . . . . . . .217. . . .
Exception Handling Overview. . . . . . . . . . . . . . . . . . . . . .217
ILE RPG Exception	Handling. . . . . . . . . . . . . . . . . . . . 220
Using Exception Handlers. . . . . . . . . . . . . . . . . . . . . . . 223
Exception Handler Priority. . . . . . . . . . . . . . . . . . . . . .223
Nested Exceptions .	. . . . . . . . . . . . . .	223
Unhandled Exceptions	. . . . . . . . . . . . . .	223

Optimization Considerations. . . . . . . . . . . . . 226. . . .

Using RPG-Specific Handlers. . . . . . . . . . . . . . . . . . . . . .226. . . . . .

Specifying	Error Indicators or the 'E' Operation. .Code. . .Extender. 227
Using an Error Subroutine. . . . . . . . . . . . . . . . . . . . . .228
Specifying	a Return Point in the ENDSR	Operation. . . . . . . . . . . 237. .
ILE Condition	Handlers. . . . . . . . . . . . . . . . . . . . . . . .238
Using a Condition Handler. . . . . . . . . . . . . . . . . . . . . .238
Using Cancel Handlers. . . . . . . . . . . . . . . . . . . . . . . .244
Problems when	ILE CL Monitors for Notify	and Status. . Messages. . . . .247

Chapter 13. Obtaining a Dump. . . . . . . . . . . . . . . . . . . .251. . . . .

Obtaining an ILE RPG Formatted Dump. . . . . . . . . . . . . . . . .251. . . .

Using the DUMP Operation Code. . . . . . . . . . . . . . . . . . . .251. . . . .

Example of a Formatted Dump. . . . . . . . . . . . . . . . . . . . .252. . . . . .


Working with Files and Devices	. . . . . . . . . . . . . . . . . . . . . . . . . .259
Chapter 14. Defining Files		. . . . . . . . . . . . .	261
Associating Files with Input/Output . Devices. . . . . . . . . . . . . . 261. . . .
Naming Files	. . . . . . . . . . . . . . . . .		263
Types of	File Descriptions. . . . . . . . . . . . . . . . . . . . . . . 263

Using Files with External-Description as Program.-Described. . . . . . .264 Example of Some Typical Relationships between Programs . and. 264Files

Defining Externally Described. .Files. . . . . . . . . . . . . . . . .265. . . . .

Renaming			Record-Format Names . . . . . . . . . . . . . . . . . . 266
Renaming			Field Names		. . . . . . . . . . . . . . . . . . . . . . 266
Ignoring Record Formats. . . . . . . . . . . . . . . . . . . . . . 266
Using		Input		Specifications			to Modify an External. . . Description. . . . .267
Using Output Specifications. . . . . . . . . . . . . . . . . . . . .269
Level Checking				. . . . .			. . . . . . . . . . . 270
Defining Program-Described Files. . . . . . . . . . . . . . . . . . . .271
Data	Management			Operations		and	ILE RPG I/O Operations. . . . . . . . .271.
Chapter	15.		General	File Considerations			. . . . . . . . . . . . . . . 273. . . .
Overriding and Redirecting File Input . and. . .Output. . . . . . . . . 273. . .
Example			of Redirecting			File	Input .and. . Output. . . . . . . . . . .274. . .
File Locking . . . . . . . . . . . . . . . . . . 275. . . .
Record Locking							. . . . . . . . . . . 276
Sharing		an	Open	Data	Path. . . . . . . . . . . . . . . . . . . . . . 277
Spooling			. . . . . . . . . . . . . . . . . . .278. . . .
Output Spooling							. . . . . . . . . . . 279
							Contents	vii

AS/400 specifications

The IBM AS/400, now known as the IBM iSeries, is a midrange computer system that has been a cornerstone of enterprise computing since its introduction in 1988. Designed to provide a robust platform for business applications, the AS/400 is celebrated for its reliability, scalability, and integrated database capabilities.

One of the key features of the AS/400 is its Integrated Operating Environment, which blends hardware and software resources seamlessly. This integration allows businesses to execute diverse workloads, ranging from traditional applications to modern web-based services, all on a single platform. The operating system, OS/400 (now IBM i), offers a rich set of APIs and tools for developers, simplifying application development and management.

Another standout characteristic of the AS/400 is its built-in database, DB2 for i. This powerful relational database management system allows for efficient data handling and provides advanced features such as support for SQL, XML, and JSON, making it easier for businesses to manage their data and integrate it with other systems. The database's tight integration with the operating system enables high performance and security.

In terms of scalability, the AS/400 can accommodate small businesses as well as large enterprises, with the ability to support hundreds of users simultaneously. Its architecture allows for easy upgrades in hardware, meaning that organizations can scale their systems without replacing the entire infrastructure.

Security is another critical attribute of the AS/400. With a sophisticated security model, it offers built-in user authentication, access control, encryption, and auditing capabilities to protect data and applications from unauthorized access.

The AS/400 also supports multiple programming languages, including RPG, COBOL, Java, and PHP, giving organizations the flexibility to choose the development tools that best fit their needs. This diversity helps maintain legacy applications while also developing new ones that leverage modern technologies.

Moreover, the platform supports both traditional green-screen interfaces and modern graphical user interfaces, allowing organizations to transition smoothly into contemporary user experience paradigms.

Overall, the IBM AS/400 stands out as a resilient, flexible, and secure computing platform that enables organizations to effectively manage their business operations, streamline processes, and adapt to changing market demands. Its unique combination of integrated features and capabilities ensures that it remains relevant in today's fast-paced technology landscape.

IBM AS/400 manual Working with Files and Devices, Vii

Models: AS/400

Working with Files and Devices

vii

AS/400 specifications