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Return Result Set from RPG output parameter

Posted on 2006-07-17
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I need to use a stored procedure(400 DB2) to take input parameters, run an RPG program, then take an RPG output parameter and display it in a result set.

I can do this with a java program call, or I can even display the RPG output on the iSeries console, but my boss requires that I convert the output to a result set and point a cursor to it.

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Question by:servicegroup
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6 Comments
 
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Accepted Solution

by:
sachinwadhwa earned 400 total points
ID: 17128425
not sure about RPG but you can surely do this using Java stored procedure.
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Expert Comment

by:Dave Ford
ID: 17134550
You may have more success with your question in the AS/400 topic area:

http://www.experts-exchange.com/Programming/Programming_Platforms/AS400/

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Assisted Solution

by:shalomc
shalomc earned 1600 total points
ID: 17142298
In RPG, you have to define an array to contain the result set, populate it, and return it to the caller.

Example from http://publib.boulder.ibm.com/infocenter/iseries/v5r3/index.jsp?topic=/sqlp/rbafyresultsete2.htm

CREATE PROCEDURE prod.rtnclient () LANGUAGE RPGLE  
        EXTERNAL NAME prod.rtnclient GENERAL


ILE RPG source for Stored Procedure prod.rtnclient

DRESULT           DS                  OCCURS(20)                    
D COL1                    1     16A                                
C     1             DO        10            X                 2 0  
C     X             OCCUR     RESULT                                
C                   EVAL      COL1='array result set'              
C                   ENDDO                                          
C                   EVAL      X=X-1
C/EXEC SQL DECLARE C2 CURSOR WITH RETURN TO CLIENT                  
C+ FOR SELECT LSTNAM FROM QIWS.QCUSTCDT FOR FETCH ONLY              
C/END-EXEC                                                          
C/EXEC SQL                                                          
C+  OPEN C2                                                        
C/END-EXEC                                                          
C/EXEC SQL                                                          
C+ SET RESULT SETS FOR RETURN TO CLIENT ARRAY :RESULT FOR :X ROWS,  
C+  CURSOR C2                                                      
C/END-EXEC
C                   SETON                                            LR
C                   RETURN        


The magic is in line SET RESULT SETS

ShalomC
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Author Comment

by:servicegroup
ID: 17147849
I don't know if i graded right. I was trying to split between the two answers.

Unfortunately, neither will work.  

I can already access the RPG programs with a java stored procedure, but the boss doesn't want it done that way.
Also, the RPG guys here say they can make an RPG program to return result sets instead of output parameters, but she won't let me do that either.
She wants me to access current RPG programs with output parameters and convert those parameters into Result Sets.

Thanks for your time though
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LVL 3

Author Comment

by:servicegroup
ID: 17147958
After looking at the RPG code closer, I have an idea.  Can I nest a stored procedure, convert the output to an array and return to the outer procedure a result set of the array?? I am not even sure that I know what I am saying.
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LVL 33

Expert Comment

by:shalomc
ID: 17148099
yes,

you can write a wrapper program in rpg that will call the current rpg programs with output parameters, convert their output to array, and return the array as a result set.

Good thinking!

btw, RPG is acronym for RPG programmer geeks.

ShalomC
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