以15分钟的间隔获取从给定的特定日期到“现在”的数据

Question

Hi I am developing an application to retrieve data from one database server to another in C# Visual Studio 2010.

There is a requirement that data should be retrieve from the database by software installation date means a specific date to now means current time.

There is also one more condition that when we get the oldest record like 2010-03-05 16:30:23 , the next record and the first record difference should be 15 minutes like next record should be 2010-03-05 16:45:23 . Database having records per minute.

I have been tried the below but it's not fulfilling the requirement.

try
 {
   var con = new SqlConnection(Properties.Settings.Default.sConstr);
   var cmd = new SqlCommand("SELECT * from RAW_S001T01 where Date_Time >='" + time + "'", con);
   con.Open();
   var dr = cmd.ExecuteReader();
   var count = 0;
   while (dr.Read())
   {
    var Date = (dr["Date_Time"].ToString());
    var temp = Date.ToString(CultureInfo.InvariantCulture);
    var UTime=time.Split(':');
    string tempa = UTime[1].Substring(0, 2);
    time = temp +int.Parse("15");
    MessageBox.Show(time);
   }
 }
 catch (Exception ex)
 {
  MessageBox.Show(@"Error.",ex.ToString());
 }

How can we resolve this?

Answer 1

Try this out:
just modify your while loop and use this code.

var Date = Convert.ToDateTime(dr["Date_Time"]);
Date = Date.AddMinutes(15);
MessageBox.Show(Date.ToString());

Hope this helps!

Answer 2

Just set the 15 minutes later time in a variable (as per Abhishek's answer).

Then process all items less than that time. When you find an item with a time greater than that time, update that time (add another 15 minutes) and redirect the output to the next section of your data structure. Keep looping until you finish.