RPG

30 pts.
Tags:
RPG/400
why we use readc opcode with suitable example?

Software/Hardware used:
AS400

Answer Wiki

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READC – Read Next Changed Record

The READC operation can be used only with an externally described WORKSTN file to obtain the next changed record in a subfile. The |record-name operand is required and must be the name of a record format defined as a subfile by the SFILE keyword on the file description specifications.
It will Read the Next Changed Subfile Records.
Eg:
<pre>C EXFMT CTLCUS
C :
* SCUSNO, SCUSNAM, SCUSADR, and SCUSTEL are fields defined in the
* subfile. CUSNAM, CUSADR, and CUSTEL are fields defined in a
* record, CUSREC which is defined in the file CUSINFO.
*
C READC SFCUSR
C DOW %EOF = *OFF
C SCUSNO CHAIN (E) CUSINFO
* Update the record only if the record is found in the file.
C :
C IF NOT %ERROR
C EVAL CUSNAM = SCUSNAM
C EVAL CUSADR = SCUSADR
C EVAL CUSTEL = SCUSTEL
C UPDATE CUSREC
C ENDIF
C READC (E) SFCUSR
C ENDDO
</pre>

Pradeep.

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