--- Kevin Toppenberg <[EMAIL PROTECTED]> wrote:
> (Hit the send button prematurely, I'll finish here)
> >
> the AC index for VA PRODUCT shows:
> Node 1: D ING^PSNXREF
> Node 2: D KING^PSNXREF
>
> So apparently a cross reference is "called" by Fileman and the
> resulting code does not necessarily result in data being put into a
> "AC" node etc.
>
> Thanks
> Kevin
Fileman allows you to create what are called MUMPS cross-references.
For most cross-references, Fileman generates the code to be executed
when a record is edited for you (the SET logic, KILL logic, and for new
style cross-references the WHOLE KILL). When you insert an entry, the
set logic is executed, when you delete an entry, the kill logic is
exercuted, and when you edit a field, the kill logic is executed first,
then the set logic. New style cross-references add another couple of
twists, including the option of allowing record level, rather than
field level, execution. But I digress. If for some reason you want to
implement a more complicated constraint, or otherwise do special
processing when you maintain the index, you can select make the
cross-reference a MUMPS cross-reference (but you must be a programmer
to do this), then you can specify the code to be executed yourself.
Other than that, the concept is the same: when the field is edited,
first the kill logic is executed and then the set logic, and it does,
well whatever you design it to do. For example, I once created a
cross-reference that maintained a map, so that I could find the first
unused IEN above a given value (in constant time). I know that sounds
crazy, but it's what I was asked to do. Other more prosaic actions
might include recording $H, updating another field, firing off a
message, etc.
===
Gregory Woodhouse <[EMAIL PROTECTED]>
"It is foolish to answer a question that
you do not understand."
--G. Polya ("How to Solve It")
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