Re: Field record relation indicators

[Hans Boldt <boldt@xxxxxxxxxx>]

Mark wrote:
>>If you need some sort of lookahead on sequential reads to an externally
>>described file, you could probably manage nicely using externally
>>described data structures and READ into DS.
>
> Wouldn't you still have to define the from and to positions in the
>look-ahead area?

No.  The technique I described works like this:  You define 2 externally
described data structures
(called, say, CURREC and LOOKREC) from the file you want to read from, using
PREFIX to rename
all the fields in one of them.  Keep the current record in CURREC and the
lookahead record in
LOOKREC.   To start reading, do:

       C                          READ        FILE              CURREC
       C                          READ        FILE              LOOKREC

To read the next record, do:

       C                          EVAL        CURREC = LOOKREC
       C                          READ        FILE              LOOKREC.

That's not too difficult, is it?

Hans Boldt, ILE RPG Development, IBM Toronto Lab, boldt@ca.ibm.com
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