Example of Module with Multiple Procedures

ARRSRPT MODULE

Main Procedure

Open file, read record, write output records, close files

InArrears

Subprocedure to determine if customer record is in arrears

FmtCust

Subprocedure to format customer data into report form

Figure 17. Components of the ARRSRPT Module

Now consider the first subprocedure, InArrears, which is shown in Fig InArrears is called by the main procedure to determine if the cur arrears.

 

TIP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

When

coding

subprocedures

that

use

global fields, you may

want

to

naming convention that shows the

item to be global. In this

example,

case

 

field

names

indicate

DDS

fields. Another option would

be to p

some

other

string

to indicate

global

scope.

 

 

 

 

 

 

 

 

 

 

If the

record is

in

arrears,

the

subprocedure returns '1' to

the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

*--------------------------------------------------------------

 

 

 

 

 

 

*

 

 

 

 

* InArrears

 

 

 

 

 

 

 

 

 

*

 

 

 

 

 

 

 

 

 

 

 

 

* Parameters: (none)

 

 

 

 

 

 

 

 

* Globals: DUEDATE, AMOUNT, CurDate

 

 

 

 

 

*

 

 

 

 

 

 

 

 

 

 

 

 

* Returns: '1' if the customer is in arrears

 

 

 

 

*--------------------------------------------------------------

 

 

 

 

 

 

*

 

 

 

P InArrears

B

 

 

 

.1/

 

 

 

D InArrears

PI

 

 

1A

.2/

 

 

 

 

 

* Local declarations

 

 

 

 

 

 

 

D DaysLate

S

 

 

10I 0

.3/

 

 

 

 

D DateDue

S

 

 

D

.3/

 

 

 

 

 

* Body of procedure

 

 

 

 

 

 

 

 

C

 

 

*ISO

 

MOVE

DUEDATE

DateDue

 

 

 

C

 

 

CurDate

SUBDUR

DateDue

DaysLate:*D

 

 

 

C

 

 

 

 

IF

DaysLate > 60 AND

 

 

 

C

 

 

 

 

 

AMOUNT > 100.00

 

 

 

 

C

 

 

 

 

RETURN

'1'

.4/

 

 

 

 

C

 

 

 

 

ELSE

 

 

 

 

 

 

 

C

 

 

 

 

RETURN

'0'

.4/ .5/

 

 

 

C

 

 

 

 

ENDIF

 

 

 

 

 

 

 

P InArrears

E

 

 

 

.1/

 

 

 

 

 

 

 

 

Figure

18.

Source for Subprocedure InArrears

 

 

 

Figure 18 shows the main elements that are common to all subprocedures

Chapter 4. Creating an Application Using Multiple37 Procedures

Page 61
Image 61
IBM AS/400 manual Example of Module with Multiple Procedures, Dds, ISO Move, Else

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.