Tip

VARPG -- Reprocess changed records

Scenario: You're validating data in changed records of a subfile, but you need to keep those records in a changed status to be processed by a future readc operation.

When you set up a readc loop to read changed records, after every readc operation the record will no longer be a "changed" record and therefore will not be processed by a future readc loop (writing, deleting or updating the record in the database.)

You will need to use the sflnxtchg function in Visual Age RPG (VARPG) to "mark" a record changed after it has been read by a readc operation.

 
/free
             //position the VARPG pointer to the top of the subfile (equivalent to a SETLL *LOVAL on a file)
       %setatr('LinerOrder':'linerdet':'startat')=1;
       readc linerdet;
       dow not %eof;
       //if the quantity field in the subfile is zero, display an error message and set the gui focus to the subfile
       if qty = 0;
       dsply *msg0005;
       %setatr('Linerorder':'linerdet':'Focus')=1;

       //set the record to be a changed record for future processing

       %setatr('LinerOrder':'linerdet':'sflnxtchg')=1;
       //leave the routine so the user can correct the error
       return;
       endif;

       //otherwise the record has changed and passes the validation, so set it to be read as a changed record
       //but start the processing on the next record.  (This prevents an endless loop).
       sflx = %getatr('Linerorder':'linerdet':'index');
       %setatr('LinerOrder':'linerdet':'sflnxtchg')=1;
       sflx = sflx + 1;
       %setatr('LinerOrder':'linerdet':'startat')=sflx;
       readc linerdet;

       enddo;
/end-free


This was first published in December 2005

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