*

-----------------------------------------------------------------

 

 

 

*

 

 

 

 

 

*

Define relevant

parts of program status data structure

*

*

-----------------------------------------------------------------

 

 

 

*

D Psds

SDS

 

 

 

 

D

Loc

 

*ROUTINE

 

 

 

D

Err

 

*STATUS

 

 

 

D

Parms

 

*PARMS

 

 

 

D

Name

 

*PROC

 

 

 

*

-----------------------------------------------------------------

 

 

 

*

* BODY OF CODE GOES HERE

 

 

 

* An error occurs

when division by zero takes place.

 

* Control is passed to the *PSSR subroutine.

 

*

-----------------------------------------------------------------

 

 

 

*

*=================================================================*

* *PSSR: Error Subroutine for the main procedure. We check for a

*

 

division by zero error, by checking if the status is

 

*

 

102. If it is, we add 1 to the divisor and continue

 

*

 

by moving

*GETIN to ReturnPt.

 

 

*=================================================================*

C

*PSSR

BEGSR

 

 

 

C

 

 

IF

Err = 102

 

 

C

 

 

ADD

1

Divisor

 

C

 

 

MOVE

'*GETIN'

ReturnPt

6

*

-----------------------------------------------------------------

 

 

 

*

*

 

An unexpected error has occurred, and so we move

 

*

 

*CANCL to

ReturnPt to end the procedure.

 

*

-----------------------------------------------------------------

 

 

 

*

C

 

 

ELSE

 

 

 

C

 

 

MOVE

'*CANCL'

ReturnPt

 

C

 

 

ENDIF

 

 

 

C

 

 

ENDSR

ReturnPt

 

 

 

 

 

 

Figure

112.

Example of *PSSR Subroutine in Main Procedure

 

The program-status data structure is defined on the Definition speci predefined subfields *STATUS, *ROUTINE, *PARMS, and *PROGRAM are speci- fied, and names are assigned to the subfields.

The

*PSSR error

subroutine

is

coded

on

the

calculation

specifications.

error occurs,

ILE RPG passes control to the *PSSR error subroutine. Th

tine

checks

to

determine

if

the exception

was caused by a divide

the

divisor

is

zero. If

it

was,

1

is added to the divisor (Div

‘*DETC’

is

moved

to the field ReturnPt, to indicate that the program

processing

at the beginning of the

detail

calculations

routine

If the exception was not a divide by zero, the literal ‘*CANCL’ is ReturnPt field, and the procedure ends.

Figure 113 on page 234 and Figure 114 on page 235 show how you woul similar program error subroutines in a subprocedure. In one example, GOTO and in the other you code a RETURN operation.

Chapter 12. Handling Exceptions233

Page 256 Page 258
Page 257
Image 257
IBM AS/400 manual Parms, Proc Body of Code Goes Here, Pssr Begsr, Move Getin, Else Move Cancl
Page 256 Page 258

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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