Course Details:

Course Outline:

Review of RPGIV Keywords, Operation Codes & Built In Functions
Free format Control, File and Definition statements
Using Date & Time Variables and Functions
Using Null Capable fields
Compile Time and Run Time arrays
Data Structures (Basic, Multiple Occurrence & Multi-dimensional)
Data Areas
Pointers & Dynamic Storage
Introduction to teraspace storage model
Commitment Control & Journalling Concepts
Sub-procedures
Local & Global Variables & Procedures (Export)
ILE Concepts
Debug Considerations & Encryption
Module & Service Program Creation & Management
Binding Directories & Binder Source
Activation Group Considerations

Pre-requisites: A basic understanding of RPG programming techniques as covered in the RPG4 Programming course (ISR4P).

Course content:

RPGIV review and Update

• Be aware of all RPGIV operation codes
• Understand the commonly used built in functions
• Be clear on the course objectives & pre-requisites
• Be able to code Free form Control statements CTL-
• Be aware of all Free form definition statements DCL-
        Files, Variables, Procedures

Date & Time variables plus null capable fields

• Define initialise and use variable types:
          Date, time, timestamp
• Convert non-date variables to date variables:
          %DATE , %TIME,  %TIMESTAMP
• Manipulate data in true date variables:
           %DAYS, %MONTHS, %YEARS, %DIFF, %SUBDT
           (%HOURS, %MINUTES, %SECONDS, %MSECONDS)
• Validate the content of a date variable (TEST)
• Convert true date variables to non-date variables:
           %CHAR, %DEC
• Define & Use null capable fields:
           ALWNULL, %NULLIND

Arrays

• Declare and use an Array
• Differentiate between compile & run time arrays
• Provide compile time data
• Use the repeat operation code FOR
• Understand the legacy code DO
• Understand how to use the array BIFs:
           %XFOOT, %LOOKUPxx, %SUBARR
• Be aware of legacy op codes: XFOOT, LOKUP
• Sort array content: SORTA

Data Structures

• Define and use a data structure
• Recognise different types and uses of data structures
• Hard code the sub structure of a data structure
• Understand how file information data structures can be used in report programming
• Redefine the sub-structure – OVERLAY
• Duplicate structures with QUALIFIED
• Initialise data structure and sub-structure
• Code and use a program status data structure
• Code and use a file information data structure
• Code free format data structure statements

External and Multiple Definitions

• Retrieve a sub-structure from an external file EXTNAME
• Using other structures: LIKEREC, LIKEDS, QUALIFIED
• Rename sub-structure fields EXTFLD, PREFIX
• Use long fields names from external definition ALIAS
• Code and use a multiple occurrence data structure
• Overlay arrays within a data structure
• Use array BIFs %ELEM, %SIZE, %OCCUR
• Understand and replace MOVEA legacy op code
• Sort linked arrays
• Read multi-dimensional arrays & Complex Data structures
• Sort and Search techniques of Data Structure Arrays

Data Areas

• Define and use a data area
• Describe and use the LDA
• Understand and use the operation codes:
           IN, OUT, UNLOCK
• Link Data areas to Data Structures
• Use and declare a user controlled data area
• Free format Data Area Definition Statements
• Soft Code Data Areas

Pointers and Dynamic Storage

• Define and use a pointer variable
• Define storage space at run-time (based)
• Use Dynamic  Storage
• Understand and use Dynamic storage commands:
           %ADDR, %ALLOC, %REALLOC & DEALLOC
• Declare Variable length & Null terminated strings

Commitment Control

• Understand commitment control requirements
• Understand how Commitment Control works
• Understand when to use commitment control
• Maintain files under commitment control
• Include commitment control into RPG program
• Use a MONITOR error trap

Sub-procedures and Optional Parameters

• Code a Sub-procedure
• Understand local & global variables
• Understand the need for and code a prototype
• Use the operation code  CALLP
• Alternative parameter passing methods:
          By reference, Read-only Reference, Value
• Define and use optional parameters:
          *OMIT, *NOPASS, %PARMS
• Default Activation Group considerations
• Faster Return Values %PARMNUM, RTNPARM
• Code a reusable sub-procedure

ILE Concepts and Introduction

• ILE v OPM
• Relationship between program and module objects
• Dynamic call v Static call
• ILE program and module object information – DSPPGM, DSPMOD
• Convert CLP to CLLE & modules. CL procedure Call – CALLPRC
• Binding CL and RPG together into a single program
• Update ILE program objects
• Include copyright into module objects
• Application isolation with Activation groups
• Controlling which activation group is used
• Reclaim resources for an activation group
• Bindable APIs

RPG Modules

• Bind RPG modules into programs
• Make source code available for interactive debug
• Define active PEP
• Understand export / import concepts
• Using export on sub-procedure definitions
• Define and use NOMAIN modules
• Code Cycle-Main and Linear-Main procedures
• Teraspace storage model v Single-level storage model

Service Programs & Binding Directories

• Bind by copy v Bind by reference
• Service Program creation and Maintenance
• Service Program exports and Public Interface
• Control Service Program Signatures
• Binder Language and QSRVSRC
• Public and Private procedures
• Binding Directory objects
• Use of Binding Directory to simplify the program creation process

Follow on Courses:

Potentially the Power RPG with SQL course (ISSQE) and the Introduction to Subfile Programming (ISRPS) course. Also consider the Rational Developer for i course (ISRDI).

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