RE: FW: data mapping error

Figure 98 of the ILE RPG Reference makes it sound so easy:  (spacing may 
be off because of the PDF formatting)
HKeywords++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
*H ALWNULL(*USRCTL)
*
* DISKFILE contains a record REC which has 2 fields: FLD1 and FLD2
* Both FLD1 and FLD2 are null-capable.
*
FDISKFILE UF A E DISK
*
* Read the first record.
* Update the record with new values for any fields which are not
* null.
C READ REC 10
C IF NOT %NULLIND(Fld1)
C MOVE âFLD1â Fld1
C ENDIF
C IF NOT %NULLIND(Fld2)
C MOVE âFLD2â Fld2
C ENDIF
C UPDATE REC
*
* Read another record.
* Update the record so that all fields are null.
* There is no need to set the values of the fields because they
* would be ignored.
C READ REC 10
C EVAL %NULLIND(Fld1) = *ON
C EVAL %NULLIND(Fld2) = *ON
C UPDATE REC
*
* Write a new record where Fld 1 is null and Fld 2 is not null.
*
C EVAL %NULLIND(Fld1) = *ON
C EVAL %NULLIND(Fld2) = *OFF
C EVAL Fld2 = âNew valueâ
C WRITE REC

Rob Berendt
-- 
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