procedure TForm1.Button6Click(Sender: TObject);
begin
  var delta: TynJsonDelta := TynJsonDelta.Create('tunit');
  try
    delta.Insert('{"unitid":"13","unitname":"人"}');
    delta.Delete('{"unitid":"66","unitname":"国"}');
    delta.Update('{"unitid":"11","unitname":"中"}', '{"unitid":"11","unitname":"个"}');
    Memo1.Text := delta.Text;
  finally
    delta.Free;
  end;
end;

{
	"table": "tunit",
	"rows": [
		{
			"action": "insert",
			"current": {
				"unitid": "13",
				"unitname": "人"
			}
		},
		{
			"action": "delete",
			"original": {
				"unitid": "66",
				"unitname": "国"
			}
		},
		{
			"action": "modify",
			"current": {
				"unitid": "11",
				"unitname": "中"
			},
			"original": {
				"unitid": "11",
				"unitname": "个"
			}
		}
	]
}