Learn Rpg4 - 1 Code Examples & CST Typing Practice Test
RPG IV (also called RPGLE or ILE RPG) is IBM’s modern dialect of the RPG programming language used on the IBM i (AS/400) platform. It provides structured, modular, and database-integrated programming capabilities for building business applications, batch processing systems, and enterprise automation on IBM i.
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Learn RPG4 with Real Code Examples
Updated Nov 27, 2025
Practical Examples
Reading/writing Db2 records
Processing daily batch files
Creating REST/JSON APIs via RPG + IWS
ERP data transformation programs
Interactive display file applications
Troubleshooting
Check library list ordering
Verify file locks
Debug using STRDBG
Inspect activation groups
Confirm SQL commitment control level
Testing Guide
Unit test procedures
Use STRDBG for interactive debugging
Test file-level locks and commit levels
Test with multiple activation groups
Validate SQL performance with Visual Explain
Deployment Options
Bound programs (CRTBNDRPG)
Modules + service programs
CL wrappers
API endpoints via IWS
Batch jobs in job scheduler
Tools Ecosystem
RDi (Rational Developer for i)
VS Code + Code for IBM i
ACS (Access Client Solutions)
IBM i Navigator
Db2 tooling (RUNSQLSTM, ACS SQL editor)
Integrations
Db2 for i SQL and native I/O
REST APIs (IWS / YAJL JSON)
MQ messaging
FTP/SFTP for batch transfers
CL programs and job schedulers
Productivity Tips
Use VS Code + Code for IBM i
Adopt SQL-centric design
Automate compilation with scripts
Use binding directories
Modularize early
Challenges
Legacy code maintenance
Handling fixed-format RPG
Understanding library lists
ILE activation group complexities
Interfacing with modern APIs
Frequently Asked Questions about Rpg4
What is Rpg4?
RPG IV (also called RPGLE or ILE RPG) is IBM’s modern dialect of the RPG programming language used on the IBM i (AS/400) platform. It provides structured, modular, and database-integrated programming capabilities for building business applications, batch processing systems, and enterprise automation on IBM i.
What are the primary use cases for Rpg4?
CRUD operations on Db2 for i. Batch processing and scheduled jobs. Business logic for ERP systems. APIs and web service backends. Data transformation and ETL workflows
What are the strengths of Rpg4?
Extremely stable and reliable on IBM i. Fast transactional performance. Deep integration with system APIs. Backward compatibility across decades. Strong support for enterprise batch workflows
What are the limitations of Rpg4?
Niche language with limited talent pool. Legacy syntax still common in older systems. Platform-specific (IBM i only). Limited modern UI capabilities. Steep learning curve for non-IBM developers
How can I practice Rpg4 typing speed?
CodeSpeedTest offers 1+ real Rpg4 code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.