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Iseries Programming

Environment

SyedIbrahim Abbas

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Topics

Development Environment User Profile

Library

Source Files

Output Queues

Development Tools

Program Development Manager

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Development Environment

SyedIbrahim Abbas

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Development Environment

The Environment is usually made up of A user profile

A library

Source files

Output Queue

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User Profile

User profile is an object which defines the resources that the usercan use

It also defines the runtime attributes of the user

User profile is set up by security officer to match the capabilities andrequirements of the user

It defines the user id and password to the system

All objects created by the user are owned by this user profile

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Library

A library is an object that serves as a directory to other systemobjects.

It is used to group related objects and to find objects by name.

A library can contains different types of objects(PGM,FILE,SRCFILE.etc)

The name of an object must be unique for each object of a particulartype within single library

The security officer normally creates library for programmer usingCTRLIB command

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Searching an Object

Qualified reference - library name / object name

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Searching an object without library

name

Searching an object when we dont know the library name will take longtime because there can be many libraries on the system, so OS/400 uses theconcept of Library List

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Library List The library list is the list of libraries to be searched when seeking an

objects The list only contain those libraries relevant to the current application

Every active job on the iSeries has its own library list

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Library list is made up of two parts System part : common libraries that are in the library list for every job running

on the system. This is the system value QSYSLIBL

User part : is set by the user or application to suit the current application or user

Once logged on its programmer responsibilities to ensure that the library listassociated with their jobs are correct using EDTLIBL command

you can add/delete/rearrange the libraries in library list

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Source Files The program source is stored in source files

There are two approach to source files Using standard source files

Using your own source files

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1) Use the same name as the IBM-supplied versions and keepthe source files in the appropriate library for a given

application, that is, all RPG source would be in QRPGSRC filein the application library

2) Using single source file per application where all source filemembers can be saved

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CRTSRCPF

The programmer must create the standard sourcefiles in their library

The create source physical file CRTSRCPFcommand is used to create all source files

QDDSSRC DDS

QRPGSRC RPG Program

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Output Queues

The output is stored in an spooled output files until they need to beprinted or displayed.

There may be many spooled output files for a single job

When spooled output file is created, the file is placed on an outputqueue

Each output queue contains an ordered list of spooled output files A Job can create spooled output files on one or more output queues

by nominating which output queue the output should be placed on

The default output queue is specified in the user profile

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The printed output is stored in an output queue for later processing

A System program called a Printer Writer take entries off the queuesand sends them to a physical printer

You should have a special output queue so all of your spooled output

is always send to the queue

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CRTOUTQ You can create your own output queue using CRTOUTQcommand

You can change the output default output queue by using CHGJOBcommand

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JOB Description Another important object in Iseries environment is Job Description

When OS initiates a job it always references a job description to getall the runtime attributes of a job

For E.g. Job description contains the initial library list to use, whichoutput queue to send the reports, and so on.

The generic job description QDFTJOBD in the QGPL library is used by

default Using CRTJOBD command you can create your own job description

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If you create your own job description, do not forgot changeyour user profile to point to your own job description

Use CHGUSRPRF to change your default job description.

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The development environment looks like.

Before start programming ensure that Your library list is correct

You are pointed to your own output queue

You have appropriate authorities, as set by your profile

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Development Tools

SyedIbrahim Abbas

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Iseries provides a number of tools to assist the developmentof an application Compilers

SEU : Source Entry Utilities SDA : Screen Design Aid

QRY : Query

DFU : Data File Utility

PDM Program Development Manager

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Compilers

Convert source code in to machine code, a language that a machinecan understood

It converts the source file member into actual object that can beexecuted or store data

High-level language compilers include C, C++, Java, CLP, RPG, COBOL It is also used to create files on iSeries

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SEU Source Entry Utility - STRSEU

SEU allows you to create, edit, display and delete source

members form workstation It is a full screen editor with many built in function

Automatic syntax checking

Predefined formats for forms based specification

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SDA Source Design Aid - STRDDA

It allows you to Design screens

Designing Menus

Testing display files

SDA converts the screen image to DDS

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QRY Query - STRQRY Query is a program that can retrieve and format information from the

database

Query can select, arrange, and analyze data stored in one or more data filesto produce reports. It handle many of your reporting needs

It also can create file as o/p for i/p to other programs, re-input to qry itself

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DFU Data File utility - STRDFU

It is used to maintain data within database file You can also create a default temporary program for quick fixes

It can perform data validation and support displays for multiple records

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PDM Program Development Manager

- STRPDM

It allows you to work with lists of libraries, objects and members toperform operation such as:

Copy, Delete, Edit, Rename, Compile

It is your primary workspace tool

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Working with libraries - WRKLIBPDM

You can limit the libraries displayed to a number of predefined values You can use all the available option like change, display, delete, etc..

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Working with objects - WRKOBJPDM

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Working with members - WRKMBRPDM

A member is a subset of records in a physical file and file can

have many members Member is file with a file

Typically, PDM is used to work with members of source files

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PDM - options

PDM performs these operation by calling commands

with known parameter values You can perform many operation without having to

know the specific command

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You can perform operations on more than one at a time

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User defined options This tool allows you to define shortcuts for system

command that you often use

For eg you can define DM to run DSPMSG command

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Function keys in PDM

F3 Exit F4- Prompt

F5- Refresh

F6create

F9- retrieve

F10 command entry

F11 removes and text and type

F13 Repeat

F16- user option

F17- Subset restrict the list to only certain libraries filter

F23- more option

F24 More function keys

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Thank you

SyedIbrahim Abbas