Implements a virtual method to retrieve field values from a record that matches specified search values.
Checks whether the dataset is unidirectional, and if so, raises an EDatabaseError exception.
Returns a Variant with the value false, indicating that a matching record was not found.
Descendant classes that are not unidirectional override this method so that it locates the record where the fields identified by the comma-delimited string KeyFields have the values specified by the Variant or Variant array KeyValues. In classes that implement Lookup, it returns a Variant or Variant array that contains the value or values of the fields specified by the comma-delimited string ResultFields on the specified record.
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