Methods for Processing Disk Files

*****************************************************************

*

PROGRAM NAME:

ESWLIM1

 

*

* RELATED FILES:

EMPMST

(Physical File)

*

*

 

LIMITS

(Physical File)

*

*

 

PRINT

(Printer File)

*

*

DESCRIPTION:

This program shows the processing of an

*

*

 

indexed file sequentially within limits.

*

*

 

This program prints out information for the

*

*

 

employees whose employee numbers are within

*

*

 

the limits given in the file LIMITS.

*

*****************************************************************

FLIMITS

IR

F

6

3 DISK

RAFDATA(EMPMST)

FEMPMST

IP

F

28L

3PIDISK

KEYLOC(1)

FPRINT

O

F

80

PRINTER

 

*Input specifications must be used to describe the records￿ in the

*program-described file EMPMST.

IEMPMST

NS 01

 

 

 

I

P

1

3

0ENUM

I

 

4

23

ENAME

I

 

24

24

ETYPE

I

P

25

26

0EDEPT

*As EMPMST is processed within each set of limits, the corre￿s-

*ponding records are printed. Processing of the EMPMST file is

*complete when the record-address file LIMITS reaches end ￿of file.

OPRINT

H

1P

 

1

 

O

 

 

 

12

'SERIAL #'

O

 

 

 

22

'NAME'

O

 

 

 

45

'DEPT'

O

 

 

 

56

'TYPE'

O

D

01

 

1

 

O

 

 

ENUM

10

 

O

 

 

ENAME

35

 

O

 

 

EDEPT

45

 

O

 

 

ETYPE

55

 

Figure 152. Sequential-within-Limits Processing of an Externally Described File

EXAMPLE PROGRAM

2 (Sequential-within-Limits Processing):

Figure 153

shows the data description specifications (DDS)

for the record-address

used by the program ESWLIM2 ( Figure 154 on page 303).

 

 

A*****************************************************************

A* RELATED PROGRAMS:

ESWLIM

*

 

A*

DESCRIPTION:

This is the DDS for the physical file

*

 

A*

 

LIMITS.

*

 

A*

 

It contains a record format named LIMIT. *

A*****************************************************************

A

 

 

 

 

AR LIMIT

 

 

A

LOW

5

0

 

 

 

 

 

 

 

A

HIGH

5

0

 

 

 

 

 

 

 

 

 

 

Figure

153.

DDS for record address file LIMITS (physical file)

 

This

 

program

performs

the

same

job

as the

previous program.

The only d

is

that the physical

file EMPMST

is

defined

as an externally

described

of

a

program-described file.

 

 

 

 

 

302 ILE RPG for AS/400 Programmer's Guide

Page 325 Page 327
Page 326
Image 326
IBM AS/400 manual ESWLIM1 Related Files Empmst, Limits, Flimits Disk, 3PIDISK KEYLOC1 Fprint, Iempmst, Eswlim Description
Page 325 Page 327

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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