Running a Program Using the CL CALL Command

Passing Parameters using the

CL

CALL

Command

 

 

 

 

 

 

 

 

 

 

You use the PARM option

of

the CL

CALL

command

to

pass

parameters

to

th

program

when

you run

it.

 

 

 

 

 

 

 

 

 

 

 

CALL PGM(program-name)

 

 

 

 

 

 

 

 

 

 

 

 

 

PARM(parameter-1 parameter-2 ... parameter-n)

 

 

 

 

 

 

 

 

You

can

also

type

the

parameters

without

specifying

any

keywords:

 

CALL library/program-name (parameter-1 parameter-2 ... param￿eter-n)

 

 

 

 

 

Each

parameter

value

can

be

specified

as

a

CL

program

variable

or

as

following:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

¹ A character string constant

¹ A numeric constant

¹A logical constant

If you

are

passing

parameters

to a

program where

an

ILE

RPG procedu

program

entry

procedure, then that program must

have

one

and

only

one

PLIST specified. The

parameters

that follow (in

the

PARM

statements)

sho

respond

on a

one-to-one basis to those

passed

through the

CALL

command.

Refer to the CALL Command inCL Referencethe(Abridged)or to the section on

"Passing Parameters between Programs"CL inProgrammingthe manual for a full description of how parameters are handled.

For

example,

the

program

EMPRPT2 requires

the

correct

password to

be

p

to

it

when it first started; otherwise it will not

run.

Figure 47

on

p

source.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1. To

create

the

program,

type:

 

 

 

 

 

 

 

 

 

 

CRTBNDRPG PGM(MYLIB/EMPRPT2)

 

 

 

 

 

 

 

 

 

 

 

2. To

run the

program,

type:

 

 

 

 

 

 

 

 

 

 

CALL MYLIB/EMPRPT2 (HELLO)

 

 

 

 

 

 

 

 

 

 

 

 

When

the

CALL

 

command

is issued, the contents of

the

parameter

pass

 

the

command is stored and the program parameter

PSWORD points

to

its

 

location. The

program

then

checks to

see

if

the

contents

of

PSWORD

 

the

value

stored

in

the'HELLOprogram,'). In( this case,

the

two

values

are

 

the

same,

and

so the program continues to

run.

 

 

 

 

 

 

104 ILE RPG for AS/400 Programmer's Guide

Page 128
Image 128
IBM AS/400 manual Passing Parameters using

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.