将秒表“hh:mm:ss:ms”转换为存储在数据库中

Question

我正在尝试在我的数据库中保存可变长度的时间。最长的可能包括几个小时，较短的只有几分钟。较短的字符串只会读取“mm:ss.ms”或“:ss.ms”，因此总长度会更短。

我试过DateTime，但它需要年、月和日。我尝试将日期设置为 0000-00-00，但没有成功。

我尝试对所有内容进行硬编码，但希望有更优雅的解决方案。这是我走了多远：

// for shorter string of type ":mm.ms"
 if (myString.length >= 3) AND (myString.length <= 4) {
      if (myString.contains(':')) {
        myString.substring(1); //remove initial semicolon
      }
      int _seconds = int.parse(myString.substring(0,1));
      int _milliseconds = int.parse(myString.substring(3,3));
 }

任何指针将不胜感激。

Answer 1

如果我解决了您的问题，这可能是您的解决方案：

  String test = ":23.24";
  String minutes = test.split(":")[0];
  String seconds = test.split(":")[1].split(".")[0];
  String milliseconds = test.split(":")[1].split(".")[1];

  Duration duration = Duration(
      minutes: int.tryParse(minutes) ?? 0,
      seconds: int.tryParse(seconds) ?? 0,
      milliseconds: int.tryParse(milliseconds) ?? 0);
  print(duration.inMilliseconds);

编辑：我找到了另一种方式，它也允许几个小时并且更强大：

int parseTimeString(String string, {int currentLayer = 0}) {
  if ((string?.length ?? 0) == 0) return 0;
  String splitString = currentLayer == 0 ? "." : ":";
  int parsed =
      int.tryParse(string.substring(string.lastIndexOf(splitString) + 1)) ?? 0;
  Duration duration;
  switch (currentLayer) {
    case 0:
      duration = Duration(milliseconds: parsed);
      break;
    case 1:
      duration = Duration(seconds: parsed);
      break;
    case 2:
      duration = Duration(minutes: parsed);
      break;
    case 3:
      duration = Duration(hours: parsed);
      break;
  }
  return duration.inMilliseconds +
      parseTimeString(
          string.substring(
              0,
              string.lastIndexOf(splitString) == -1
                  ? 0
                  : string.lastIndexOf(splitString)),
          currentLayer: currentLayer + 1);
}

Edit2：我认为这应该适合你。

int parseTimeString(String string, {int currentLayer = 0}) {
  if ((string?.length ?? 0) == 0) return 0;
  String splitString = currentLayer == 0 ? "." : ":";
  String substring = string.substring(string.lastIndexOf(splitString) + 1);
  if(currentLayer == 0){
    while(substring.length<3){
      substring += "0";
    }
  }
  int parsed =
      int.tryParse(substring) ?? 0;
  Duration duration;
  switch (currentLayer) {
    case 0:
      duration = Duration(milliseconds: parsed);
      break;
    case 1:
      duration = Duration(seconds: parsed);
      break;
    case 2:
      duration = Duration(minutes: parsed);
      break;
    case 3:
      duration = Duration(hours: parsed);
      break;
  }
  return duration.inMilliseconds +
      parseTimeString(
          string.substring(
              0,
              string.lastIndexOf(splitString) == -1
                  ? 0
                  : string.lastIndexOf(splitString)),
          currentLayer: currentLayer + 1);
}

String timeToString(int millis){
  Duration duration = Duration(milliseconds: millis);
  String result = duration.toString();
  while(result.substring(result.length-1)=="0"){
    result = result.substring(0,result.length-1);
  }
  if(result.substring(result.length-1)==".")
    result += "0";
  return result;
}