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  2. RPG400-L
  3. November 2011

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

On 11/25/2011 5:43 PM, Barbara Morris wrote:
When you need extra control over which fields get changed by a READ or
CHAIN, a good way is to use data structures for the I/O operations.

D A_ds e ds extname(A : *input) qualified
D B_ds e ds extname(B : *input) qualified

read A a_ds
chain key B b_ds
eval-corr b_ds = a_ds
update B b_ds

I can't tell whether you are using RPG III or RPG IV, but this requires
using RPG IV. If you have to use RPG III for some reason (???), you will
have to have a TMP for every field, or you will have to use I specs to
rename every field for one of the files, and then add MOVE operations to
get the file A values into the file B fields.

Barbara, has anybody put in a request for extname( a: *both) for data structures? It could throw a compile time error if the input and output formats were different. That one simple addition could remove a whole lot of unnecessary code.

Joe

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