IBM AS/400 manual Defining Program-Described Files, RPG I/O Operations, Data

	Data	Management	Operations	and	ILE	RPG I/O Operations
The	RPG program	does	not provide level checking for program-described
for	files using	the	devices	SEQ	or	SPECIAL.

For more information on how to specify level checking,Data Managemseent the manual.

Defining Program-Described Files

Program-described files are files whose records and fields are des input/output specifications in the program that uses the file. To use described file in an RPG program you must:

1. Identify the file(s) in the file description specifications.

2. If	it	is an input file,		describe	the		record and		fields in th
The	file	name	in positions	7 through	16	in	the	input	specifications
same	as	the	corresponding	name entered		in	the	file	specifications

On the record-identification entries you indicate whether you wan sequence checking of records within the file.

3. Enter the same file name as in step 1 in the FACTOR 2 field of lation specifications which require it. For example, WRITE operation

program-described

file

require a

data

structure

name

in

the

resu

4. If

it

is

an output

file,

describe

the record

and

fields

in t

In

addition,

you

specify

how the output is to

be

printed.

The

tions 7 through 16 in

the

output

specifications must be

the

same

sponding

name

entered

in the file

specifications.

A program-described file must exist on the system, and be in your before the program can run. To create a file, use one of the Cre

which can be foundCL inReferencethe (Abridged).

Data Management Operations and ILE RPG I/O Operations

Data management is the part of the operating system that controls th accessing of data by an application program. Table 17 on page 272 sh data management operations provided by the AS/400 and their correspond RPG operation. It also shows which operations are allowed for which device type.

Chapter 14. Defining Files271