ParamsToVariant and VariantToParams

 function ParamsToVariant(Params: TParams; Macro, Compatible: Boolean): Variant;
var
  I: Integer;
  Tmp: Variant;
begin
  if (Params.Count = 0) then
    Result := Null
  else begin
    Result := VarArrayCreate([0, Params.Count - 1], varVariant);
    for I := 0 to Params.Count - 1 do
      with Params[I] do
      begin
        if Compatible then
          Tmp := VarArrayOf([Name, Unassigned, Unassigned, Unassigned]) else
          Tmp := VarArrayOf([Name, Unassigned, Unassigned, Unassigned, Macro]);
        Tmp[3 - 2 * ord(Compatible)] := Value;
        Tmp[1 + ord(Compatible)] := Ord(DataType);
        Tmp[2 + ord(Compatible)] := Ord(ParamType);
        Result[I] := Tmp;
      end;
  end;
end;

procedure VariantToParams(const VarParams: Variant; Params: TParams; Compatible: Boolean);
var
  I: Integer;
  Param: TParam;
begin
  Params.Clear;

  if not VarIsNull(VarParams) then
    for I := 0 to VarArrayHighBound(VarParams, 1) do
    begin
      Param := Params.CreateParam(
        TFieldType(VarParams[I][1 + ord(Compatible)]),
        VarParams[I][0],
        TParamType(VarParams[I][2 + ord(Compatible)]));

      Param.DataType := TFieldType(VarParams[I][1 + ord(Compatible)]);
      if VarIsNull(VarParams[I][3 - 2 * ord(Compatible)]) or VarIsEmpty(VarParams[I][3 - 2 * ord(Compatible)]) then
        Param.Clear else Param.Value := VarParams[I][3 - 2 * ord(Compatible)];
    end;
end;