AS400 application development is a robust platform that has been a cornerstone of enterprise computing since its introduction in 1988. For beginners looking to develop applications on this system, understanding its architecture, programming languages, and the tools available is crucial. If you’re a beginner looking to delve into AS400 application development, understanding its foundational aspects is essential.
The AS400 is an integrated system that combines hardware, operating system, and software into a single, user-friendly environment. Its operating system, originally known as OS/400 and now called IBM i, is renowned for its stability, security, and versatility. It supports various programming languages, including RPG (Report Program Generator), COBOL, CL (Control Language), and Java. RPG, in particular, has been synonymous with AS400 development due to its close integration with the platform.
Programming Languages Used in AS400 Application Development
RPG (Report Program Generator) – Originally designed for report generation, RPG has evolved into a powerful high-level language that supports modern programming paradigms. Its integration with DB2 allows developers to create robust applications that can handle complex data processing tasks.
COBOL – This language is well-suited for business applications, particularly in sectors like finance and insurance, where data handling is critical. COBOL’s strong file-handling capabilities make it a reliable choice for large-scale applications.
SQL – As the standard language for managing relational databases, SQL is essential for querying and manipulating data in AS400’s integrated database environment. SQL can be embedded in RPG and COBOL programs, enhancing their data-handling capabilities.
Getting Started with AS400 Development
Learn the Basics of RPG – RPG is a high-level programming language primarily used for business applications on the AS400 platform. As a beginner, starting with RPG IV (the latest version) is advisable, as it introduces modern programming concepts while maintaining backward compatibility with older RPG versions.
Familiarize Yourself with the Development Environment – The primary development tool for AS400 is Rational Developer for i (RDi), an Eclipse-based IDE that offers features like syntax highlighting, debugging, and project management. Understanding how to navigate RDi will make your development process smoother.
Understand Database Integration – The AS400 system is tightly integrated with the DB2 database, which is an embedded relational database management system (RDBMS). As an AS400 developer, you’ll frequently interact with DB2 for data storage and retrieval. Learning SQL (Structured Query Language) is crucial for managing database operations within your applications.
Explore AS400 Utilities – AS400 offers various built-in utilities to assist with development, such as the Data File Utility (DFU) for handling data files and the Program Development Manager (PDM) for organizing your projects. Getting acquainted with these tools can significantly boost your productivity.
Practice and Experiment – Like any other programming platform, the key to mastering AS400 application development is consistent practice. Work on small projects, experiment with different features and gradually take on more complex tasks as you build your skills.
AS400 application development may seem daunting at first, but with the right approach and resources, beginners can quickly grasp the fundamentals and start building robust business applications. By learning RPG, understanding the development environment, and practicing regularly, you can become proficient in AS400 development and leverage its power to create reliable, enterprise-level solutions.
