Using Externally Described Disk Files

*.. 1 ...+... 2 ...+... 3 ...+... 4 ...+... 5 ...+... 6 ...+... 7 ..*

A..........T.Name++++++RLen++TDpB......Functions++++++++++++++++++++*

A**FLDRED

DSTREF

DISTRIBUTION APPLICATION FIELD REFERENCE

A

R DSTREF

 

 

 

TEXT('Distribution Field Ref')

A* COMMON FIELDS USED AS REFERENCE

 

A

BASDAT

 

6

0

EDTCDE(Y) .1/

A

 

 

 

 

TEXT('Base Date Field')

A* FIELDS USED BY CUSTOMER MASTER FILE

 

A

CUST

 

5

 

CHECK(MF) .2/

A

 

 

 

 

COLHDG('Customer' 'Number')

A

NAME

 

20

 

COLHDG('Customer Name')

A

ADDR

R

 

 

REFFLD(NAME) .3/

A

 

 

 

 

COLHDG('Customer Address')

A

CITY

R

 

 

REFFLD(NAME) .3/

A

 

 

 

 

COLHDG('Customer City')

A

STATE

 

2

 

CHECK(MF) .2/

A

 

 

 

 

COLHDG('State')

A

SRHCOD

 

6

 

CHECK(MF) .2/

A

 

 

 

 

COLHDG('Search' 'Code')

A

 

 

 

 

TEXT('Customer Number Search +

A

 

 

 

 

Code')

A

ZIP

 

5

0

CHECK(MF) .2/

A

 

 

 

 

COLHDG('Zip' 'Code')

A

CUSTYP

 

1

0

RANGE(1 5) .4/

A

 

 

 

 

COLHDG('Cust' 'Type')

A

 

 

 

 

TEXT('Customer Type 1=Gov 2=Sch+

A

 

 

 

 

3=Bus 4=Pvt 5=Oth')

A

ARBAL

 

8

2

COLHDG('Accts Rec' 'Balance') .5/

A

 

 

 

 

EDTCDE(J) .6/

A

ORDBAL

R

 

 

REFFLD(ARBAL)

A

 

 

 

 

COLHDG('A/R Amt in' 'Order +

A

 

 

 

 

File')

A

LSTAMT

R

 

 

REFFLD(ARBAL)

A

 

 

 

 

COLHDG('Last' 'Amount' 'Paid')

A

 

 

 

 

TEXT('Last Amount Paid in A/R')

A

LSTDAT

R

 

 

REFFLD(BASDAT)

A

 

 

 

 

COLHDG('Last' 'Date' 'Paid')

A

 

 

 

 

TEXT('Last Date Paid in A/R')

A

CRDLMT

R

 

 

REFFLD(ARBAL)

A

 

 

 

 

COLHDG('Credit' 'Limit')

A

 

 

 

 

TEXT('Customer Credit Limit')

A

SLSYR

R+

2

 

REFFLD(ARBAL)

A

 

 

 

 

COLHDG('Sales' 'This' 'Year')

A

 

 

 

 

TEXT('Customer Sales This Year')

A

SLSLYR

R+

2

 

REFFLD(ARBAL)

A

 

 

 

 

COLHDG('Sales' 'Last' 'Year')

A

 

 

 

 

TEXT('Customer Sales Last Year') .7/

Figure

140. Example of a field Reference File

 

 

 

 

This

example of a

field-reference file shows the

definitions

of

the

used

by

the

CUSMSTL

(customer

master

logical)

file

as shown in

Figure 13

page 283.

The

field-reference

file

normally

contains

the definitions

of

used by other files. The following text describes some of the entri reference file.

.1/ The BASDAT field is edited by the Y edit code, as indicate keyword EDTCDE(Y). If this field is used in an externally desc output file for an ILE RPG program, the edit code used is t fied in this field-reference file; it cannot be overridden in program. If the field is used in a program-described output

284 ILE RPG for AS/400 Programmer's Guide

Page 307 Page 309
Page 308
Image 308
IBM AS/400 Dstref Distribution Application Field Reference, Basdat Edtcdey, Cust Checkmf, Addr Reffldname, City Reffldname
Page 307 Page 309

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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