Exception Handling Overview

Chapter 12. Handling Exceptions

This chapter explains how ILE RPG exception handling works, and how to

¹Exception handlers

¹ ILE RPG-specific handlers

¹ ILE condition handlers

¹Cancel handlers

ILE RPG supports the following types of exception handlers:

¹ RPG-specific handlers,

for

example,

the

use of an error indicator

tion code extender,

or a

*PSSR or

INFSR

error subroutine.

¹ILE condition handlers, user-written exception handlers that you reg

time using the ILE condition handler bindable API CEEHDLR.

¹ ILE cancel handler

which

can

be

used when

a procedure

ends

abno

Most

programs

benefit

from

some

sort

of

planned

exception handling

bec

can

minimize

the number of

unnecessary

abnormal

ends (namely,

those

as

with function checks). ILE condition

handlers also allow you to handle

mixed-language applications in a

consistent

manner.

You

can

use

the

RPG

exception

handlers

to handle most situations tha

in a RPG application. The minimum

level of exception handling which RPG

vides is

the

use

of

error

indicators

on certain operations. To lear

read

the following

sections

in

this

chapter:

¹ “ILE RPG Exception Handling” on page 220

¹“Specifying Error Indicators or the 'E' Operation Code Extender” on

Additionally, to learn how ILE exception handling works, read:

¹ “Exception Handling Overview” (for general concepts)

¹ “Using RPG-Specific Handlers” on page 226

¹The sections on error handlingILE Conceptsin .

For information on exception handling and the RPGILE cycle,RPG forseeAS/400

Reference.

Note: In this book the term 'exception handling' is used to refer to handling and error handling. However, for consistency with other terms, the term 'error' is used in the context of 'error indic subroutine'.

Exception Handling Overview

Exception

handling is the

process

of:

¹ Examining

an exception

message

which has been issued as a result

time error

 

 

¹Optionally modifying the exception to show that it has been rece handled)

Copyright IBM Corp. 1994, 1999

217

Page 240 Page 242
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IBM AS/400 manual Handling Exceptions, Exception Handling Overview, 217, Infsr
Page 240 Page 242

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.
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