Creating a Service Program Using CRTSRVPGM

Strategies for Creating Service Programs

When creating a service program, you should keep in mind:

1. Whether you intend to update the program at a later date

2. Whether any

updates will involve changes to the interface (namely,

and exports

used).

If the interface to a service program changes, then anyyou may have t programs bound to the original service program. However, if the changes are upward-compatible, you may be able to reduce the amount of re-b created the service program using binder language. In this case, aft binder language source to identify the new exports you need to re-b programs that use them.

 

 

TIP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

If

 

you

 

are

planning

a module

with

only

subprocedures

(that is,

with

with

keyword

NOMAIN

specified

on

the

control

specification) you may wa

create

it as

a

service

program.

Only

one

copy

of

a

service

progra

on

a

 

system,

and so you will need less storage for the module.

Also,

you

can

copyright your service programs using the COPYRIGHT keyw

on

the

control

specification.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Binder

 

language

gives

you

control

over

the exports

of

a

service

progr

control

 

can

be

very

useful

if

you

want

to:

 

 

 

 

 

 

¹ Mask certain service program procedures from service-program users

¹Fix problems

¹Enhance function

¹ Reduce the impact of changes to the users of an application.

See “Sample Service Program” on page 94 for an example of using binder guage to create a service program.

For information on binder language, masking exports, and other service pr concepts, seeILE Concepts.

Creating a Service Program

Using CRTSRVPGM

 

 

 

 

You create a service program using

the

Create Service Program (CRTSRVPG

command.

Any

ILE module

can be bound

into

a service program. The module

must exist before you can create

a service program with it.

Table 9

on

page 93 lists

the CRTSRVPGM

parameters and their defaults. For

full description of the CRTSRVPGM command and its parameters,CL

refer to t

Reference

(Abridged).

 

 

 

 

92 ILE RPG for AS/400 Programmer's Guide

Page 115 Page 117
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IBM AS/400 manual Strategies for Creating Service Programs, Creating a Service Program Using Crtsrvpgm, Reference Abridged
Page 115 Page 117

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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