Transcript OPS234 Lecture 2

IBC233 Lecture 2
Updated Winter 2008
Agenda
•
•
•
•
•
Test next Week – Jan 23
ISeries Architecture
CL (Control Language)
Library Lists
Operations Navigator
ISeries Architecture
Logical
Machine
Application Software
OS/400
Machine Interface (MI)
Physical
Machine
Physical Machine
CL
• Control Language
– It’s how you communicate with the ISeries
Server
– Made up of over 1500 commands based
on the English language
– Commands can be grouped together in a
CL program to perform a certain task.
Command Syntax
Command Name— Parameter(s)
eg. WRKOBJPDM LIBRARY01
or
WRKOBJPDM LIB(LIBRARY01)
A Parameter is a key piece of information
that the command needs for execution.
Most parameters have default values.
Command Names
•
•
•
•
Based on the English Language
Verbs eg. Create, Delete, Copy, etc.
Nouns (objects) eg. Library, File, Job
Adjectives - used to further define the
noun (object)
• eg.
CRTLIB
WRKUSRPRF
DSPJOBQ
CRTCBLPGM
Finding Commands
• Use the menus (MAJOR, VERB menus)
• Go directly to the menu associated with
the noun or verb e.g. GO CMDCRT or
GO CMDOUTQ
• DSP*
What are the easiest ways to
enter Commands?
• Use the iSeries menus
• Use the Prompt Screens (F4)
CL Syntax
• Keyword
– Each command parameter has a keyword or
label associated
– Keyword notation assigns the parameter value
to the parameter with the given keyword
• Positional Notation
– Assigns the parameter value to each parameter
in order
WRKOBJPDM
• Parameters:
–
–
–
–
Library (LIB)
Objects (OBJ)
Object Type (OBJTYP)
Object Attribute (OBJATR)
• WRKOBJPDM QCLLESRC
– Is positional notation and will work with objects using PDM on
library QCLLESRC
• WRKOBJPDM OBJ(QCLLESRC)
– Is keyword notation and will work with all objects in the
previously used library that have the name QCLLESRC)
Question
• How would you find the keyword for the
DATE and USER parameters used in
the command to retrieve job attributes?
• How would you find all the keywords of
a command to display your job log (the
history of your job)?
Question
• What would you type to send the “Hi
Friend’ to the message queue for
DB233C40?
Steps to Creating a CL Program
• Create a Source Physical File to hold the
code if it doesn’t already exist
• Create a Source Member in the Source
Physical File
• Type in code
• Exit and Save
• Compile
How the iSeries finds Objects
• When an object is created, it is created ‘in’ a
particular library.
• To access an object, the iSeries needs to
know what library the object is in.
• (CL) Commands prompt you for the object
name and library name.
• *LIBL is the default for library
Library Lists
• The list of Libraries through which the
iSeries searches to find objects.
• Similar to the DOS ‘Path’ concept
• Each Job has a library list
• *LIBL = library list
Library Lists cont’d
• A Library List consists of 4 parts:
– System Libraries (up to 15)
– Product Libraries (none, 1 or 2)
– Current Library(1 only)
– User Library ( up to 25)
• To view your library list - DSPLIBL
How do Libraries get on your
Library List?
• When you sign on, your library list is
built from:
– QSYSLIBL (system value)
– QUSRLIBL (system value)
– Current library from User Profile
• Product libraries are added as needed
by the system
Library List Commands
• ADDLIBLE
– Adds an entry to a library list to the USER
portion of the library list
• RMVLIBLE
– Removes an entry from the USER portion of
the library list
• EDTLIBL
– Adds/Deletes/Changes entries on the USER
portion of the library list
Library List Commands
• CHGCURLIB
– Changes the Current Library
• CHGLIBL
– Changes the Current Library and allows
Add/Change/Delete to the USER portion of the
library list.
• All Library List commands are listed on the
CMDLIBL menu.
Question
• Why would we want to change our
library list?
• Is BAC344LIB a Current Library or a
User Library?
Hunt for the program Hello
Storing Objects
• When an object is created, it is stored in the
library specified.
• If no library is specified, it is stored in
*CURLIB (current library).
• If there is no current library, it is stored in
QGPL library.
• Exception: Library Descriptions, Device
Descriptions and User Profiles are always
stored in library QSYS.
Demo “MARKS” Application
• See in done in C
• See it done using a display file and a CL
program
Input/Output Screen:
Constants and Attributes
• ‘Constants’ are basically the words that you want
displayed on the screen. Examples of constants
would be Screen Title, showing available
function keys.
• Attributes define how constants and other fields
are displayed on the screen. Each field on the
screen has an attribute byte or properties.
Designing your screen
• Use constants to give the user information
• Define your data (input/output) fields
– Fields must be identified as input, output or both
– They must declared as character or numeric
– Length and if numeric, no. of decimal places must be
defined
• Date, Time or User constants can be used to
display system values.
Designing Screens
• Start IBM WDSC – Code Designer
• Find the following Icons
– Create named field
– Create date constant
– Create time constant
– Create text constant
• Use Properties to change named field
attributes
Naming Data Fields
• It is important to name each of the data fields.
These names will become the variable names
when used in a program.
Changing Display Options
• Right Click on entity
• Click on Properties
Enabling Function Keys
• Click on the icon – Show record Properties
• Click on CA/CF
• Click on either CA to create a CA function
key or CF to create a CF function key
• Click on the function Key
• Click on the parameters function key
Demonstration
Testing Display Files –
Screen Design Aid
•
•
•
•
•
•
Check compile listing to make sure it’s OK
STRSDA, Option 3: Test Display File
Enter the Display File Name
Set the indicators and data fields
Press enter to see how it looks
Repeat the last 2 steps as needed
For next Week: