将datetime2插入数据库

Question

I am using datetime2 as the datatype for checkIn and checkOut . Previously I can add into database with this code.

//value for checkIn = 12/25/2015 2:00:00 PM
checkIn = DateTime.ParseExact(Session["checkInDate"].ToString(), "dd/MM/yyyy", CultureInfo.InvariantCulture).AddHours(14);

//value for checkOut = 12/26/2015 12:00:00 PM
checkOut = DateTime.ParseExact(Session["checkOutDate"].ToString(), "dd/MM/yyyy", CultureInfo.InvariantCulture).AddHours(12);

strInsert = "INSERT INTO Reservation ( checkInDate, checkOutDate) VALUES (@checkInDate, @checkOutDate)";

cmdInsert = new SqlCommand(strInsert, conn);
cmdInsert.Parameters.AddWithValue("@checkInDate", checkIn);
cmdInsert.Parameters.AddWithValue("@checkOutDate", checkOut);

But now it doesn't work and I am getting this error;

"Conversion failed when converting date and/or time from character string".

I think the error is caused by the check in value which contain the "PM" and "AM", but it is weird because previously I am able to add this into the database.

Does anybody know how to fix this?

Answer 1

It appears that you want to discard the time part of checkInDate . Using ParseExact to do that is not really the correct way. Instead you can use the .Date property of a DateTime and then add on the hours.

Also, to avoid the hassles which .AddWithValue can give, simply use .Add , so...

string s = "12/25/2015 2:00:00 PM";
DateTime checkIn = DateTime.Parse(s, CultureInfo.GetCultureInfo("en-US")).Date.AddHours(14);
// ....
string strInsert = "INSERT INTO Reservation (checkInDate, checkOutDate) VALUES (@checkInDate, @checkOutDate)";

using (SqlConnection conn = new SqlConnection(connStr))
{
    using (SqlCommand cmdInsert = new SqlCommand(strInsert, conn))
    {
        cmdInsert.Parameters.Add(new SqlParameter("@checkInDate", SqlDbType.DateTime2).Value = checkIn);
        // ....
    }
}

Note that you can store a DateTime in a Session value, there is no need to store it as a string.

I notice that you quote the checkin date in USA date format (MM/dd/yyyy), but your format in .ParseExact is "dd/MM/yyyy". This may also be a source of trouble.