DataSet -> Strings -> DataSet

Problem/Question/Abstract:

DataSet -> Strings -> DataSet

Answer:

///////Begin Source

function StrLeft(const mStr: string; mDelimiter: string): string;
begin
  Result := Copy(mStr, 1, Pos(mDelimiter, mStr) - 1);
end; { StrLeft }

function ListCount(mList: string; mDelimiter: string = ','): Integer;
var
  I, L: Integer;
begin
  Result := 0;
  if mList = '' then
    Exit;
  L := Length(mList);
  I := Pos(mDelimiter, mList);
  while I > 0 do
  begin
    mList := Copy(mList, I + Length(mDelimiter), L);
    I := Pos(mDelimiter, mList);
    Inc(Result);
  end;
  Inc(Result);
end; { ListCount }

function ListValue(mList: string; mIndex: Integer; mDelimiter: string = ','): string;
var
  I, L, K: Integer;
begin
  L := Length(mList);
  I := Pos(mDelimiter, mList);
  K := 0;
  Result := '';
  while (I > 0) and (K <> mIndex) do
  begin
    mList := Copy(mList, I + Length(mDelimiter), L);
    I := Pos(mDelimiter, mList);
    Inc(K);
  end;
  if K = mIndex then
    Result := StrLeft(mList + mDelimiter, mDelimiter);
end; { ListValue }

function DataSetToText(mDataSet: TDataSet; mStrings: TStrings;
  mDelimiter: string = #9): Boolean;
var
  vBookmark: string;
  I: Integer;
  S: string;
begin
  Result := False;
  if (not Assigned(mDataSet)) or (not mDataSet.Active) or
    (not Assigned(mStrings)) then
    Exit;
  mStrings.Text :=
    StringReplace(Trim(mDataSet.FieldList.Text), #13#10, mDelimiter, [rfReplaceAll]);
  vBookmark := mDataSet.Bookmark;
  mDataSet.DisableControls;
  try
    mDataSet.First;
    while not mDataSet.Eof do
    begin
      S := '';
      for I := 0 to mDataSet.FieldList.Count - 1 do
        S := S + mDelimiter + mDataSet.FieldList[I].AsString;
      Delete(S, 1, Length(mDelimiter));
      mStrings.Add(S);
      mDataSet.Next;
    end;
  finally
    mDataSet.Bookmark := vBookmark;
    mDataSet.EnableControls;
  end;
  Result := True;
end; { DataSetToText }

function TextToDataSet(mStrings: TStrings; mDataSet: TDataSet;
  mDelimiter: string = #9): Boolean;
var
  I, J, C: Integer;
  vFieldNames: string;
begin
  Result := False;
  if (not Assigned(mDataSet)) or (not mDataSet.Active) or
    (mStrings.Count <= 0) then
    Exit;
  vFieldNames := mStrings[0];
  C := ListCount(vFieldNames, mDelimiter);
  for I := 1 to mStrings.Count - 1 do
  try
    mDataSet.Append;
    for J := 0 to C - 1 do
      if mDataSet.FieldList.IndexOf(ListValue(vFieldNames, J, mDelimiter)) >= 0 then
        mDataSet[ListValue(vFieldNames, J, mDelimiter)] :=
          ListValue(mStrings[I], J, mDelimiter);
    mDataSet.Post;
  except
    Exit;
  end;
  Result := True;
end; { TextToDataSet }
///////End Source

///////Begin Demo

procedure TForm1.Button1Click(Sender: TObject);
begin
  DataSetToText(Table1, Memo1.Lines);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  TextToDataSet(Memo1.Lines, Table1);
end;
///////End Demo