as400 - an introduction (part 3)

7/27/2019 AS400 - An Introduction (Part 3)

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HCL Technologies Ltd.

An Introduction to the

AS/400 / iSeries / i5

Mid-Range Sys tem

(Part 3)

Overview of Application Development

Joy Patnaik


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Application Development

Landscape OPM

OPM Original Program Model

Chief Characteristics :

One source member being compiled into oneexecutable program

Inter-Language calls not possible

Most Legacy code runs in OPM (unless converted to

ILE)


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Landscape ILE

ILE Integrated Language Environment

Chief Characteristic :

Two-step process to create programs.

Source members are first compiled into moduleobjects (type *MOD). Modules can be thought ofas sub-programs. They are validated andcompiled machine code, but are not executable.

One or more modules must then be bound intoan executable program

Modules created using different programminglanguages may be bound into the same program

object.


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Landscape - Languages

Control / Command Language CL, CMD

Legacy Applications RPG (various flavours RPG-II, RPG/400)

COBOL/400

Recent Applications GUI - Java, Domino

Green-Screen ILE RPG, ILE COBOL

Other Languages BASIC, C


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Landscape Tools - 1

Programmer Tools UI for often-used programming tasks - Programming

Development Manager (PDM)

Editor - Source Entry Utility (SEU)

Describing Data Sources and Sinks Data Description Specification (DDS)

Editor (SEU)

Design screen layout - Screen Design Aid (SDA)

Design report layout - Report Layout Utility (RLU)


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Landscape Tools - 2

Other Tools Compilers (for various languages)

Debuggers (for OPM and ILE)

Data File Utility (DFU)


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Workflow OPM - 1

Example : Order Entry Screen Specficiations :

Screen should allow Add / Change / Delete for Order details

Screen should allow printing of Order Book


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Workflow OPM - 2 Workflow for OPM App. Dev.

Design database files for storing Order Data Create Physical Files (PF) source member (code) using editor

(SEU)

Compile DDS for PF source member

Output : Object with Object Type = *FILE (PF-DTA)

Design logical views of Order data Create Logical Files (LF) source member (code) using editor (SEU)

Compile DDS for LF source member

Output : Object with Object Type = *FILE (LF)

Design screen layout for Order Entry screen Create screen layout using SDA

Compile DDS for screen

Output : Object with Object Type = *FILE (DSPF)


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DB2/400

Explanation of DB2/400
http://localhost/var/www/apps/conversion/tmp/scratch_6/DB2400.ppthttp://localhost/var/www/apps/conversion/tmp/scratch_6/DB2400.ppt


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Order Entry System (OES)

Explanation of DDSs for requirements

specified in Design Document for OES

Create required DDSs

as400 - an introduction (part 3)

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