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  3. January 2017

Re: Road Map to move a home grown application from RPG to DB2 SQL or to any other data base platform


Views can't be accessed by RLA and indexes are limited with their
definitions.


RPG "F" specs and READxx opcodes CAN reference SQL Views... No problem. For
some reason I just had a deja-vu moment - like I answered this question
once before.

My recommendation is: first change your access method from RLA to SQL -
it's rather easy.


My recommendation is to use SQL for use cases that call for "sets" (i.e.
dynamic queries), and use RLA for when you need to insert, update, delete,
find, and check the existence of just one record.


if you introduce a functional data access layer. Then you have all
prerequisites to switch your data definition from DDS to SQL DDL and
redesign your database, without any harm fro your applications.


I'd suggest that functional data access layers can provide wrappers around
RLA in addition to SQL.

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