If I have a unique secondary index on a Paradox table, and I need to check
that the integrity is not violated by a particular value in a record, how do
I do that and trap any resulting key violation exception?
The problem with the PostError event and others is that they don't indicate
in sufficient detail exactly what caused a post error (in this case a key
violation exception), i.e. which field failed if there is more than one
unique index.
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