Question

我使用的API每5分钟分析一次视频并将数据写入数据库。问题是，在数据库中，时间显示为秒（300000、600000、900000 ...），而不是分钟。我是否可以将计时转换为分钟，然后再将其插入数据库？

getFrameTimeStamp =视频的特定分钟数

//the code below means it will only write in every 5 minutes (300000)
if (has.getFrameTimeStamp() % 300000 == 0) {
    using (SqlConnection conn = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\sit\Desktop\(NEW) LEA WINFORMS\28June_LessonEffectivenessAnalysis\LessonEffectivenessAnalysis\LessonEffectivenessAnalysis\LessonEffectivenessAnalysis\LessonAnalysis.mdf;Integrated Security=True")) {
       conn.Open();

       using (SqlCommand cmd1 = new SqlCommand("INSERT INTO TBL_VIDEO(TIMESTAMP,JOY_SCORE,SURPRISE_SCORE,ANGER_SCORE,FEAR_SCORE,SADNESS_SCORE,DISGUST_SCORE) VALUES('" + has.getFrameTimeStamp().ToString() + "','" + people.get(i).impression.emotion_response.joy_score.ToString() + "','" + people.get(i).impression.emotion_response.surprise_score.ToString() + "','" + people.get(i).impression.emotion_response.anger_score.ToString() + "','" + people.get(i).impression.emotion_response.fear_score.ToString() + "','" + people.get(i).impression.emotion_response.sadness_score.ToString() + "','" + people.get(i).impression.emotion_response.disgust_score.ToString() + "')", conn)) {

          using (SqlDataReader dr = cmd1.ExecuteReader()) {
          }
       }
   }
}

Answer 1

要回答您的问题，请将该值除以60000（60秒为毫秒）以得到所需的结果。

但是，最好将值存储为数字毫秒，并在显示给用户时根据需要执行转换。

// Constants
const int INTERVAL_1_MINUTES_AS_MICROSECONDS = 1 * 60 * 1000; // Or 60000
const int INTERVAL_5_MINUTES_AS_MICROSECONDS = 5 * 60 * 1000; // Or 300000


if (has.getFrameTimeStamp() % INTERVAL_5_MINUTES_AS_MICROSECONDS == 0)
{
    using (SqlConnection conn = new SqlConnection(connectionString))
    {
        conn.Open();

        using (SqlCommand cmd1 = new SqlCommand())
        {
            cmd1.CommandText = @"INSERT INTO TBL_VIDEO(TIMESTAMP,JOY_SCORE,SURPRISE_SCORE,ANGER_SCORE,FEAR_SCORE,SADNESS_SCORE,DISGUST_SCORE)";
            cmd1.CommandText += " VALUES (@FrameTimeStamp, @emotion_response_joy, @emotion_response_surprise, @emotion_response_anger, @emotion_response_fear, @emotion_response_sadness, @emotion_response_disgust);";

            cmd1.CommandType = CommandType.Text;
            // Potentially adding a numeric value as string
            //cmd1.Parameters.Add(new SqlParameter("@FrameTimeStamp", (Math.Floor(has.getFrameTimeStamp() / INTERVAL_1_MINUTE_AS_MICROSECONDS)).ToString())); // Need to type check
            cmd1.Parameters.Add(new SqlParameter("@FrameTimeStamp", (has.getFrameTimeStamp()).ToString()));
            cmd1.Parameters.Add(new SqlParameter("@emotion_response_joy", people.get(i).impression.emotion_response.joy_score.ToString()));
            cmd1.Parameters.Add(new SqlParameter("@emotion_response_surprise", people.get(i).impression.emotion_response.surprise_score.ToString()));
            cmd1.Parameters.Add(new SqlParameter("@emotion_response_anger", people.get(i).impression.emotion_response.anger_score.ToString()));
            cmd1.Parameters.Add(new SqlParameter("@emotion_response_fear", people.get(i).impression.emotion_response.fear_score.ToString()));
            cmd1.Parameters.Add(new SqlParameter("@emotion_response_sadness", people.get(i).impression.emotion_response.sadness_score.ToString()));
            cmd1.Parameters.Add(new SqlParameter("@emotion_response_disgust", people.get(i).impression.emotion_response.disgust_score.ToString()));

            int rowsAffected = cmd1.ExecuteNonQuery();
        }
    }
}

点与代码示例的耦合。您正在将时间戳转换为字符串以存储值。结果，很难对值执行算术运算，因为每次都必须转换为数字形式。将值存储为数字（最好是Long或其他合适的类型）。

此外，您可能希望使用参数来提供值，而不是使用字符串串联。

最后，执行插入操作时无需使用SqlDataReader，因为不会返回任何记录。使用ExecuteNonQuery是更好的选择。

TlDr; 除以60000。如果您有明确的要求，将值存储为分钟或毫秒，并在显示代码中执行转换。使用SQL参数提供数据。

将时间以分钟计入数据库

1 个答案: