RE: Iterate through the fields in an externally described data st ructure

On Friday 12 April 2002 6:14 pm, Buck Calabro wrote:
> >Your technique with the QUSLFLD API is correct...
> >the only thing you need to do is write routines
> >that dynamically convert the extracted bytes to an
> >alphanumeric presentation in case it's not a
> >character field.
>
> Don't forget NULL support.
> I have GOT to see how to handle date/time datatypes this way...  Off to
> the books I go!
>
>   --buck

Hi Buck

My routines handle date/time as far as I know, but there is no way to
handle NULLs in a program described file[1] (which is how I handle
generic files). As far as converting to .csv is concerned it's not too
bad, as I've put together a CVTNULFLD routine to strip them out first
(obviously over a copy if it's a live file), but not much use when you
have to handle them (like from a trigger). There was an article in
iSeries News recently with a .csv generator that used the C APIs to read
the file instead of direct I/O in RPG, and that could deal with NULLs.
I've not yet looked at the technique, so my solution isn't quite there
yet.

Regards, Martin
[1] The compile option is for read only access or user control
(in/update/out) for externally described files only :(
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