Thought I was one the RPG list.

Still, the idea is the same, the C equivalent to SETLL is _Rlocate().


On Mon, Oct 20, 2008 at 4:29 PM, Charles Wilt <charles.wilt@xxxxxxxxx> wrote:
You could simply use SETLL to check for the existence, it doesn't
actually read a record so no structure needed.

HOWEVER, I'd recommend simply trying to do the write and monitoring
for a duplicate key error.

Otherwise, it is possible that at the time you do the SETLL the record
doesn't exist, yet when you go to write it, somebody else has already
written it. So your program could still receive a duplicate key

In addition, the SETLL technique will not detect the fact that some
other logical has a key specified as UNIQUE.


On Mon, Oct 20, 2008 at 4:20 PM, Olsson Erik <erik.eo.olsson@xxxxxxxxx> wrote:

A most trivial question.

I'm using native I/O and have a struct corresponding to a database "record".
Before I write to my file I want to check to see if a row with my values
exist before I write to a db file - can I manage this without two structs
(one for the "record" and another one for the composite key?

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