Re: RPG400 same fields name of Input and Output files Update & Write question

Hi Gary!

Most of your assumptions are correct, but before I take the time to address them, would you tell me why you are coding this program? Is it a production program on a live system, or is this just a theoretical exercise for some sort of RPG class? Because in the modern RPG programming community, we no longer recommend the use of RPG III style coding and indicators. And even in RPG III, we emphatically recommend AGAINST the use of left-hand indicators (such as your 99 LEAVE instruction).

Joe

Hi,

I have a simply RPG with one Input file A, one output file B and they have same fields names KEY, FIELD1, FIELD2

Here is the code:

*LOVAL SETLL A
1 DOWEQ 1
READ A 99
99 LEAVE

WRITE B


ENDDO

Without any MOVE (no rename of file B FIELD1& FIELD2) it can write to file B

However, for update operation


*LOVAL SETLL A
1 DOWEQ 1
READ A 99
99 LEAVE

(MOVE FIELD1#TMP)

KEY CHAIN B 98
(MOVE #TMP FIELD1)

N98 UPDATE B


ENDDO

Without any MOVE in (...), can reading every records in file A update FIELD1& FIELD2 in file B of the matching key of file B?
Further, if I add MOVE FIELD1 #TMP before CHAIN, and N98 MOVE #TMP FIELD1 after CHIAN, can it only update FIELD1 in file B with value of FIELD1 in file A? and FIELD2 is unchanged in file B?


Thanks

CHOI