Stored Procedures in RPG

["Joe Pluta" <joepluta@xxxxxxxxxxxxxxxxx>]

Mohammad Tanveer asked a question a week or so ago about SQL stored
procedures in RPG that piqued my interest.

Let's say as a thought exercise that I decided to design a system where
programs returned data exclusively via result sets.  This would have the
portability benefits that are always mentioned when SQL is discussed.

So, I would write "server" programs that returned result sets, and "client"
programs that asked for them.  I'm relatively comfortable with writing
EXEC-SQL statement that actually do SELECT statements, but I guess I'm not
sure about the syntax of calling a stored procedure, especially one that
accepts parameters and returns a result set.

I'm similarly in the dark about how the server program receives the
parameter data and parses it out, and how it builds the result set and
returns it, although my research so far shows that you basically create an
array of records, and return it.  It's the exact syntax there that eludes
me.

So I guess I'm looking for an end-to-end example of an RPG program using the
stored procedure syntax of SQL to call a second RPG program that returns a
result set.  If someone could point me in the right direction, I'd be much
obliged, and I think this woud answer Mohammad's question as well.  (Well,
I'm sure it's overkill for his question, but then I'm nowhere near as versed
in SQL as he and many of you are.)

Joe