AStrategy to Avoid. . . . . . . . . . . . . . . . . . . . . . . . . . 31. . . . . . . .

Chapter 4. Creating

an Application Using

Multiple Procedures

. . . . . .33

A Multiple Procedures Module — Overview. . . . . . . . . . . . . . . .33. . . .

Main Procedures and Subprocedures. . . . . . . . . . . . . . . . . 33

Prototyped Calls

34

Example

of Module with Multiple Procedures. . . . . . . . . . . . . . . .36. . . .

The

Entire

ARRSRPT Program

. . . . . . . . . . . . . . . . . . . . 41

Coding Considerations

.45 . . . .

General Considerations

45

Program Creation

46

Main Procedure Considerations. . . . . . . . . . . . . . . . . . . . 46

Subprocedure Considerations

. . . . . . . .46

For Further Information. . . . . . . . . . . . . . . . . . . . . . . . 47

Main Procedures

47

Subprocedures

47

Prototyped Call

48

Creating and Running an ILE

RPG

Application

 

. . . . . . . . . . . . . . . . . . 49

Chapter

5. Entering

Source

Statements

. . . . . . . . . . . . . . . . .51. . . .

Creating a Library and Source Physical. . . .File. . . . . . . . . . . .51. . . .

Using the Source Entry Utility. . . (SEU)

52

Using

SQL

Statements

55

Chapter 6. Creating a Program with

the CRTBNDRPG Command

. . . . .

57

Using

the

CRTBNDRPG

Command

. . . . . . . . . . . . . . . . . . .

57

Creating

a

Program for

Source Debugging

59. . . .

Creating

a

Program

with

Static .Binding. . . . . . . . . . . . . . . .60 . . . .

Creating

an

OPM-Compatible

Program Object. . . . . . . . . . . . . .61. . .

Using

a

Compiler

Listing. . . . . . . . . . . . . . . . . . . . . . . .63

Obtaining

a Compiler

Listing. . . . . . . . . . . . . . . . . . . . . .63

Customizing

a

Compiler

Listing. . . . . . . . . . . . . . . . . . . . 64

Correcting

Compilation

Errors. . . . . . . . . . . . . . . . . . . . .66

Correcting

Run-time

Errors. . . . . . . . . . . . . . . . . . . . . . 68

Using

a

Compiler Listing

for Maintenance. . . . . . . . . . . . . . . .69. . . .

Accessing the RETURNCODE Data Area. . . . . . . . . . . . . . . . .70 . . . .

Chapter 7.

Creating

a

Program

with

the

CRTRPGMOD and CRTPGM

Commands

 

 

 

. . . . . . . . . . . . . . . . . .73

Creating a Module Object. . . . . . . . . . . . . . . . . . . . . . . .73

Using

the

CRTRPGMOD

Command

. . . . . . . . . . . . . . . . . .74

Creating a Module for Source Debugging. . . . . . . . . . . . . . . .78. . . .

Additional Examples

. . . . . . . . . . . . . . . 80

Behavior

of

Bound

ILE

RPG

Modules. . . . . . . . . . . . . . . . . 80

Related

CL

Commands . . . . . . . . . . . . . . . . . . . . . . . .80

Binding

Modules

into

a Program. . . . . . . . . . . . . . . . . . . . .81

Using

the

CRTPGM

Command

. . . . . . . . . . . . . . . . . . . . 82

Additional Examples

. . . . . . . . . . . . . . . 85

Related

CL

Commands . . . . . . . . . . . . . . . . . . . . . . . .85

Using

a

Binder

Listing. . . . . . . . . . . . . . . . . . . . . . . . . 85

Changing

 

a

Module

or

Program. . . . . . . . . . . . . . . . . . . . .86

Using

the

UPDPGM

Command . . . . . . . . . . . . . . . . . . . . 87

iv ILE RPG for AS/400 Programmer's

Guide

 

 

 

 

 

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Image 6
IBM AS/400 manual Sql, With
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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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