Using a Program Error Subroutine

To handle a program error or exception you can write a program error (*PSSR). When a program error occurs:

1. The program status data structure is updated.

2. If

an indicatornot specifiedis

in

positions

73 and 74 for the operation

error

is

handled and

control

is

transferred

to

the *PSSR.

 

You

can

explicitly

transfer

control

to

a program error subroutine af

by

specifying

*PSSR

after the

keyword

INFSR

on

the

File

Description

tions.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

You can code a *PSSR

for any (or all) procedures

in

the

module.

Each

local to

the

 

procedure

in

which

it

is coded.

 

 

 

 

 

To add

a

*PSSR

error

subroutine

to

your

program, you do the following

1. Optionally

identify

the

program

status

data

structure

(PSDS) by

spec

in

position

23

of

the

definition

specification.

 

 

 

 

2. Enter

a

 

BEGSR

operation

with

a

Factor

1 entry

of

*PSSR.

 

3.Identify a return point, if any, and code it on the ENDSR operat routine. For subprocedures, factor 2 must be blank. For a discussio valid entries for Factor 2, see “Specifying a Return Point in the E Operation” on page 237.

4.Code the rest of the program error subroutine. Any of the ILE R

operations

can be used in

the program

error

subroutine.

The ENDSR o

must be the last specification for the

program error subroutine.

Figure 112 on

page 233 shows

an example

of

a

program error

subroutine

main procedure.

 

 

 

 

 

232 ILE RPG for AS/400 Programmer's Guide

Page 256
Image 256
IBM AS/400 manual Using a Program Error Subroutine, After Keyword, Position Definition Specification Enter

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.