Re: Environment Variables in RPGLE

[Scott Klement <rpg400-l@xxxxxxxxxxxxxxxx>]

The getenv() API is extremely easy to use in RPG -- but not so easy in 
CL.  I'm a little confused about which language you're using, since the 
topic of your message says 'RPGLE', but your text talks about CL...

Environment variables are also extremely easy to use in QShell -- but 
again, that's not CL.

CL has commands to add, change and remove an environment variable, but I 
don't think it has one to read the contents of a variable  My suggestion 
is that you write your own simple RTVENVVAR command, then just use that 
command from the CL programs.

Armbruster, Tom wrote:
> I'm in the process of designing a multi-customer system on a single box
> which will segregate data to separate libraries based on the customers'
> unique settings.  In other words, there is global functionality and data
> that is common to all users, and there is customer specific data that
> should not be accessible by other users.  Rather than duplicate the
> common functions to each unique customer library, I want to have a
> common ground for the core of the program, and only differentiate
> between customer specific data which will reside in a unique customer
> library.  Since the data file structures in question will be consistent
> across the various libraries, I believe the programs will be indifferent
> to the location of the physical and logical files in question.  PLEASE
> let me know if this is not the case, else the remainder of my query is
> moot.
>
> The overall plan is to establish library lists and environment variables
> for each unique customer database via CL.  Before you suggest it, I am
> fully aware that this can be accomplished via DB2 SQL and pure ILE.
> However, time is of the essence and many of our expert resources are
> most comfortable with programming in an RPG/RPGLE environment, which
> precludes the desire to define the environment without keyed file
> structures.
>
> I've reviewed the APIs for environment variables in CL which allow for
> additions, changes and removals.  All of the documentation that I've
> come across states that querying the value of a specific environment
> variable needs to be prototyped as an external call to either getenv()
> or Qp0zGetEnv().  Is this really the case, or is there a CL method of
> retrieving the value of a specific environment variable?  Some of the
> common methods in place will record the specific data library.  I'd like
> to know if this is possible without duplicating and supporting common
> functionality across multiple libraries.
>
> Thanks,
> Tom Armbruster