Copy the current record of a dataset

Problem/Question/Abstract:

Copy the current record of a dataset

Answer:

I found this routine which copies the current record of the currently selected record. This is useful e.g. to keep a temporary record for display in a form.

{************************************************
// procedure AppendCurrent
//
// Will append an exact copy of the current
// record of the dataset that is passed into
// the procedure and will return the dataset
// in edit state with the record pointer on
// the currently appended record.
************************************************}

procedure AppendCurrent(Dataset: Tdataset);
var
  aField: Variant;
  i: Integer;
begin
  // Create a variant Array
  aField := VarArrayCreate(
    [0, DataSet.Fieldcount - 1],
    VarVariant);
  // read values into the array
  for i := 0 to (DataSet.Fieldcount - 1) do
  begin
    aField[i] := DataSet.fields[i].Value;
  end;
  DataSet.Append;
  // Put array values into new the record
  for i := 0 to (DataSet.Fieldcount - 1) do
  begin
    DataSet.fields[i].Value := aField[i];
  end;
end;