Using

SPECIAL Files

 

 

 

 

 

 

 

Table

27.

Valid File Operations for a SPECIAL File

 

 

 

 

 

 

 

 

 

File

Description

Specifications

Calculation

Specifications

Positions

 

Positions

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

17

 

18

 

 

 

 

26-35

 

 

 

 

 

 

 

 

 

 

 

 

I

 

 

P/S

CLOSE,

FEOD

 

 

 

 

 

 

 

 

 

 

 

 

 

C

 

 

P/S

WRITE,

CLOSE,

FEOD

 

 

 

 

 

 

 

 

 

 

 

U

 

 

P/S

UPDATE,

DELETE,

CLOSE,

FEOD

 

 

 

 

 

 

 

 

 

O

 

 

 

WRITE,

OPEN,

CLOSE, FEOD

 

 

 

 

 

 

 

 

 

I

 

 

F

READ,

OPEN,

CLOSE, FEOD

 

 

 

 

 

 

 

 

 

 

C

 

 

F

READ,

WRITE,

OPEN,

CLOSE,

FEOD

 

 

 

 

 

 

 

 

 

U

 

 

F

READ,

UPDATE,

DELETE,

OPEN,

CLOSE,

 

 

 

 

FEOD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Example of Using a Special File

Figure 163 shows how to use the RPG device name SPECIAL in a program. example, a file description found in the file EXCPTN is associated wi

SPECIAL.

*

.. 1 ...

+

...

2 ...

+

... 3 ...

+

... 4 ...

...+

5 ...

...+

...6

+

... 7

...+...

*

FFilename++IPEASFRlen+LKlen+AIDevice+.Keywords+++++++++++++++++++++++++++++

FEXCPTN

 

O

F

 

20

 

SPECIAL PGMNAME('USERIO')

 

 

 

 

F

 

 

 

 

 

 

 

 

PLIST(SPCL)

 

 

 

 

 

 

*

.. 1 ...

+

...

2 ...

+

... 3 ...

+

... 4 ...

+...

5 ...

+...

6 ...

+

... 7

...+...

*

DName+++++++++++ETDsFrom+++To/L+++IDc.Functions++++++++++++++++++++++++++++

D OUTBUF

 

 

 

DS

 

 

 

 

 

 

 

 

 

 

 

D

FLD

 

 

 

 

1

 

20

 

 

 

 

 

 

 

 

*

.. 1 ...

+

...

2 ...

+

... 3 ...

+

... 4 ...

+...

5 ...

+...

6 ...

+

... 7

...+...

*

CL0N01Factor1+++++++Opcode(E)+Factor2+++++++Result++++++++Len++D+HiLoEq.￿

...

C

SPCL

 

 

 

PLIST

 

 

 

 

 

 

 

 

 

 

C

 

 

 

 

 

PARM

 

 

 

FLD1

 

 

 

 

 

 

C

 

 

 

 

 

MOVEL

 

'HELLO'

 

FLD

 

 

 

 

 

 

C

 

 

 

 

 

MOVE

 

'1'

 

FLD1

 

 

 

1

 

 

C

 

 

 

 

 

WRITE

 

EXCPTN

 

OUTBUF

 

 

 

 

 

C

 

 

 

 

 

MOVE

 

'2'

 

FLD1

 

 

 

1

 

 

C

 

 

 

 

 

WRITE

 

EXCPTN

 

OUTBUF

 

 

 

 

 

C

 

 

 

 

 

SETON

 

 

 

 

 

 

 

 

LR

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure

163.

SPECIAL Device

 

 

 

 

 

 

 

 

 

 

Figure 164 on page 330 shows the user-written program USERIO.

Chapter 17. Accessing Externally Attached329 Devices

Page 353
Image 353
IBM AS/400 manual Example of Using a Special File, Special Pgmnameuserio, Fld

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.