Update controls bound to a query without a primary index

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Update controls bound to a query without a primary index

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If a query has a primary index, you may just code "Query1.Refresh"
to update a form. This fails if the query has no primary index.
The following procedure shows a flicker-reduced solution:

procedure UpdateQuery(aQuery : TQuery);
var
  aBookmark : TBookmark;
begin
  aQuery.DisableControls;
  aBookmark := aQuery.GetBookmark;
  aQuery.Close;
  aQuery.Open;
  aQuery.GotoBookmark (aBookmark);
  aQuery.FreeBookmark (aBookmark);
  aQuery.EnableControls;
end;

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