毫秒未显示在 DateTime 类型的 SQL 输出中

Question

I am having a problem seeing the millisecond component of a DATETIME type column.

The code that defines the table is:

string command = string.Format("CREATE TABLE {0}(EventDateTime DATETIME, layer3Id VARCHAR(35), EventType VARCHAR(55), Protocol VARCHAR(30), MessageBody VARCHAR(MAX), MessageContent VARCHAR(MAX))", tableName);
SendSqlCommand(command);

The code that populates the row is :

string insertCommand = string.Format(@"INSERT INTO {0} VALUES (@p1, @p2, @p3, @p4, @p5, @p6)", tablename);

_con.Open();

using (SqlCommand cmd = new SqlCommand(insertCommand, _con))
{
    cmd.Parameters.AddWithValue("@p1", record.EventDateTime);
    cmd.Parameters.AddWithValue("@p2", record.layer3Id);
    cmd.Parameters.AddWithValue("@p3", record.EventType);
    cmd.Parameters.AddWithValue("@p4", record.Protocol);
    cmd.Parameters.AddWithValue("@p5", record.MessageBody);
    cmd.Parameters.AddWithValue("@p6", record.MessageContent);

    cmd.ExecuteNonQuery();
}

where the EventDateTime string value is something like 2016/01/09 16:10:08.500

When I run a query on the table I get back this: 09/01/2016 16:10:08

No milliseconds. I don't know if the values are going to the database or if it is the wrong type to use or if the query is not responding correctly:

TestTable.Take (100)

Answer 1

So lets assume you have those values in your database:

By running pure sql statement you should be able to retrieve datetime in the format you would anticipate, with milliseconds

And in your C#, as an example, you can control the format, here is an example:

            var res = db.MyTables.Take(100);

            foreach(var date in  res)
            {
                Console.WriteLine(Convert.ToDateTime(date.EventDateTime).ToString("dd/MM/yyyy hh:mm:ss.fff"));
            }

Here is the output:

Answer 2

There are milliseconds. You just don't display them.

So, when you read the time from the database, you need to format it for output, like this:

string s;
s.Format("{0:yyy-MM-dd hh:mm:ss.fff}", record.EventDateTime)

Now you can display the variable s