0

I am using the Calendar extender to extend a textbox in ASP.NET inside of Visual Studio 2010. I am trying to insert the date of an event into the database along with other bits of information. I am receiving the "Data type mismatch in criteria expression" error when trying to insert into the database.

I tried using DateTime.ParseExact to convert the string date to Access Date/Time but still no luck.

Here is my code behind:

Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click

    Dim oleDbConn As New OleDb.OleDbConnection(ConfigurationManager.ConnectionStrings("BookMeetConnString").ConnectionString)
    Dim SqlString As String = "Insert into Events(EventTitle,EventDescription,EventDate,EventCategory) Values (@f1,@f2,@f3,@f4)"
    Dim cmd As OleDbCommand = New OleDbCommand(SqlString, oleDbConn)

    cmd.CommandType = CommandType.Text
    cmd.Parameters.AddWithValue("@f1", tb_eventtitle.Text)
    cmd.Parameters.AddWithValue("@f2", tb_eventdescription.Text)
    cmd.Parameters.AddWithValue("@f3", DateTime.ParseExact(tb_eventdate.Text, "dd/MM/yyyy",
    CultureInfo.InvariantCulture))
    cmd.Parameters.AddWithValue("@f4", dd_eventcategory.SelectedValue)
    oleDbConn.Open()
    cmd.ExecuteNonQuery()
    System.Threading.Thread.Sleep("2000")
    Response.Redirect("~/calendar.aspx")
End Sub

Here is my ASP.NET code (notice that I am also formatting the date inserted into the textbox by the CalendarExtender as "dd/MM/yyyy"):

 <asp:TextBox ID="tb_eventdate" runat="server" ToolTip="Enter a
 date"></asp:TextBox>
                <ajaxToolkit:CalendarExtender ID="tb_eventdate_CalendarExtender"  Format="dd/MM/yyyy" runat="server"

                    TargetControlID="tb_eventdate">
                </ajaxToolkit:CalendarExtender>

The field in my Access database is of type "Date/Time".

I don't know why I am having this problem as I have managed to retrieve dates from the database in another function and converted them ToString:

    Function GetEventListing(selectedDay As DateTime) As DataTable
    '--read event listing for the given day from an Access query
    Dim con As OleDbConnection = GetConnection()
    Dim cmd As OleDbCommand = New OleDbCommand()
    cmd.Connection = con
    cmd.CommandText = String.Format("Select * from EventInfo Where EventDate >= #{0}# And EventDate < #{1}#", _
                                    selectedDay.ToString("dd/MM/yyyy"), _
                                    selectedDay.AddDays(1).ToString("dd/MM/yyyy"))
    Dim ds As DataSet = New DataSet()
    Dim da As OleDbDataAdapter = New OleDbDataAdapter(cmd)
    da.Fill(ds)
    con.Close()

    Return ds.Tables(0)
End Function

What could be the cause of the error I am receiving?

4

1 回答 1

3

也许不是日期让你感到困惑。我想您可能会收到错误，因为您添加了一个DateTime值作为参数（而不是转换为格式为yyyy-mm-ddor的字符串的日期m/d/yyyy），但是我在 C# 中尝试了以下操作，它工作正常...

static void Main(string[] args)
{
    OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\Documents and Settings\Administrator\Desktop\Database1.accdb;");
    conn.Open();
    OleDbCommand cmd = new OleDbCommand("INSERT INTO Events (EventName, EventDate) VALUES (?, ?)", conn);
    cmd.Parameters.AddWithValue("?", "TestEvent");
    cmd.Parameters.AddWithValue("?", (new DateTime(2013,3,21)));
    cmd.ExecuteNonQuery();
    conn.Close();

    Console.WriteLine("Done.");
}

...因此，如果您的 DateTime 解析返回一个有效的 DateTime 值，那么看起来您的查询应该可以工作。

如果确实是 SQL 语句的执行失败了，那么唯一可能的另一个嫌疑人是dd_eventcategory.SelectedValue. 也许这需要.ToString()'d...？

于 2013-04-10T16:35:00.990 回答