Migrating from RPG III to RPG IV
The automatic conversion works and is the right starting point. The real work begins afterwards, and it pays to know in advance where it gets stuck.
Articles tagged #rpg — 6 results
An introduction to free-form RPG
Free-form is not RPG dressed up as another language: it is the same RPG freed from the columns. What really changes once you stop counting positions.
Programming on IBM i: sources, ILE, RPG and SQL
How software is written, compiled and kept alive here. For anyone arriving from other languages, and for anyone who has never read the reasons written down.
SQL inside programs
How to write SQL inside RPG, why SQLCODE zero does not mean everything went well, and where injection hides on this platform too.
RPG: from columns to free-form
Why old code is written in columns, what changed with free-form, and how to live with two forms of the same language in one application.
SQLCODE -305: the FETCH that stops on NULLs
Eighty-two COALESCEs are not the answer. What is left in the variables when a FETCH meets a NULL, and why ALWNULL has nothing to do with it.