Differences

 

Between

 

OPM

 

RPG/400

and

ILE

RPG

 

 

 

 

 

 

 

 

 

4. Call

performance

for

LR-on will be greatly

 

improved

by

having

no

PSD

PSDS

no

longer

than

80

bytes,

since

some

of

the

information

 

that

 

fil

PSDS

after

80

bytes

is

 

costly

to

obtain.

If the PSDS is not code

short

to

contain

the

date

and

time

the

program

started,

 

these

t

not

be

available

 

in

a

formatted

 

dump.

All

other

PSDS

 

values

will

 

be

no

matter

how

long

the

 

PSDS

is.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5. The

prefix

for

ILE

RPG

inquiry

messages

is

RNQ, so

if

 

you

use

reply

list,

you

must add RNQ entries similar to your existing

 

RPG

6. In

OPM,

if

a

CL

 

program calls your RPG program followed by a MONMSG

the

RPG program

receives

a

notify

or

status

message, the

CL

 

MONMSG

not

handle

the

notify

or

status

 

message.

If

you

are

calling

 

ILE

CL and

both

are

 

in

the

same

activation

group, the

ILE

CL

MONMSG

 

will

the notify or status message and the RPG procedure

will

 

halt

imme

without

an

RPG

error

message

 

being

issued.

For

more

information

 

se

lems

when

ILE

CL

Monitors

for

 

Notify

and

Status

Messages”

on page 2

7. When

displaying

a variable using the ILE

source

debugger,

you

wi

able

results

if:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

¹

the

ILE

RPG

program

 

uses

 

an

externally

described

file

and

 

 

¹

the

variable

is

defined

in

the

data

base

file

but

not

refe

 

RPG

program.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I/O

1.In ILE RPG you can read a record in a file opened for updat overridden with SHARE(*YES), and then update this locked record in a

program that has opened the same file for update.

2. You

cannot

modify the

MR indicator

using the MOVE or SETON operatio

(RPG

III

only prevents

using SETON

with MR.)

3. The File Type entry on the File specification no longer dictates operations that must be present in the calculation specifications.

For

example,

in

RPG III, if

you

define

a

file

as

an

update

f

have

an UPDAT operation later in the program. This

is

no

longer

tru

IV.

However, your file definition still must be

consistent

with

th

present

in

the

program.

So

if

you

have

an

UPDATE

operation

in

your

the

file

must

be

defined

as

an

update

file.

 

 

 

 

 

 

 

4. ILE

RPG

will allow record blocking even

if

the

COMMIT

keyword

is

s

the

file

description

specification.

 

 

 

 

 

 

 

 

 

 

5. In

RPG

IV,

a

file

opened

for update

will

also

be

opened

as

d

You

do

not

need

any

DELETE

operations to

make it

delete

capable.

6. In

RPG

IV,

you

do

not

have

to

code

an

actual

number

for

the

devices that will be used by a multiple-device file. If you sp

MAXDEV(*FILE)

on a

file description

specification, then

the number

o

areas

created

for

SAVEDS and SAVEIND is based on the

number

of

d

that your

file

can

handle. (The

SAVEDS, SAVEIND, and MAXDEV keywords

an RPG

IV

file

description specification correspond

to

the

SAVDS,

NUM options on a RPG III file description specification continuati respectively.)

Appendix A. Behavioral Differences Between OPM RPG/400 and ILE 375RPG for AS/400

Page 398 Page 400
Page 399
Image 399
IBM AS/400 manual Rpg Iii
Page 398 Page 400

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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