Note

that

the

File specification

for PRDMAS identifies both the INFDS a

the

INFSR

to

be associated with

it.

The following is done for each record in the TRANSACT file:

1.The appropriate record in the product master file is located usin action product number.

2. If

the

record is found, then the quantity

of the inventory is u

3. If

an

error occurs on the UPDATE operation,

then control is passed

INFSR

error subroutine.

 

4. If the record is not found, then the product number is written

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

* TRNSUPDT: This program is a simple inventory update progr￿am.

*

* The transaction file (TRANSACT) is processed consecutive￿ly.

*

* The product number in the transaction is used as key to ac￿cess

*

* the master file (PRDMAS) randomly.

*

* 1. If the record is found, the quantity of the inventory wil￿l

*

*

be updated.

 

 

*

* 2. If the record is not found, an error will be printed on a

*

*

report.

 

 

 

*

* 3. If the record is currently locked, the transaction will￿ be

*

*

written to a transaction back log file which will be

*

*

processed later.

 

*

* 4. Any other unexpected error will cause a runtime error

*

*

message.

 

 

 

*

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

*

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

 

 

 

*

* Define the files:

 

*

*

1) PRDMAS

 

- Product master file

*

*

2) TRANSACT

 

- Transaction file

*

*

3) TRNBACKLG

- Transaction backlog file

*

*

2) PRINT

 

- Error report.

*

*

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

 

 

 

*

FPRDMAS

UF

E

 

K DISK

 

F

 

 

 

 

INFSR(PrdInfsr)

 

F

 

 

 

 

INFDS(PrdInfds)

 

FTRANSACT

IP

E

 

DISK

 

FTRNBACKLG O

E

 

DISK

 

FPRINT

O

F

80

PRINTER

 

*

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

 

 

 

*

* Define the file information data structure for file PRDM￿AS.

*

* The *STATUS field is used to determine what action to take￿.

*

*

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

 

 

 

*

D PrdInfds

 

DS

 

 

D

PrdStatus

 

*STATUS

 

*

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

 

 

 

*

* List of expected exceptions.

*

*

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

 

 

 

*

D ErrRecLock

 

C

CONST(1218)

 

 

 

 

 

 

 

 

Figure

111

(Part

 

1 of

2). Example of File Exception Handling

 

230 ILE RPG for AS/400 Programmer's Guide

Page 254
Image 254
IBM AS/400 manual INFSRPrdInfsr INFDSPrdInfds, Disk Ftrnbacklg O Fprint Printer, PrdInfds PrdStatus, ErrRecLock CONST1218

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.