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1987-07-24
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I have been using the relationional arrow in dBase III+ for some
time. Set relation and the "relational" arrow give some pretty
impressive capabilites to dBase & Clipper. Most important, this
can extend dBase set relations so that they are functionally
equivilent to the Clipper multi-child relations. Also, however,
both Clipper and Dbase can be assisted by the somewhat expanded
concept of multi-file relations which is possible. I have
included two demo-test programs.
RELATION.PRG demonstrates two kinds of multi file relations --
A. One parent to more than one child.
B. Several parents to one child.
Both dBase and Clipper versions are included in the code.
The file relation also illustrates a similar concept regarding
indexing. It is possible to index a file on a value not in the
file but in a related file.
It also MAY be possible to replace values in related files. It
is possible in dBase, but something goes wrong in Clipper.
The BREAKTST.PRG program demonstrates what happens when a multi-
file relation chain is broken in dBase and in Clipper. This test
shows, tentatively, that a non-linear dBase relation chain works
just like the special Clipper multi-child Clipper relation.
If anyone knows of anyone who has dealt with this concept in a
more complete manner, I'd like to hear about it. If you are
interested, you may reach me at 1-409-838-2195 or write 270
DuCote, Beaumont, Tx 77707. I am not an email convert, but you
might leave a message on this system.