Question

我通过此方法将日期从 WPF 发送到 ModelClass .......

private void buttonNTSave_Click(object sender, RoutedEventArgs e)
{
    ModelClass model = new ModelClass();
    model.TaskInsertion(textBoxNTSubject.Text, textBoxNTType.Text, Convert.ToDateTime(datePickerNT.SelectedDate), textBoxNTTitle.Text, textBoxNTDetail.Text);
}

此方法正在数据库中插入日期 ...

public void TaskInsertion(string subject, string type, DateTime dueDate, string title, string detail)
{
    SqlConnection conn = new SqlConnection(connectionString);
    try
    {
        string query = "INSERT INTO Tbl_Task (Email, Subject, Type, DueDate, Title, Detail) VALUES ('" + userEmail + "', '" + subject + "' , '" + type + "', '" + dueDate.Date + "', '" + title + "', '" + detail + "')";

        SqlCommand cmd = new SqlCommand(query, conn);
        conn.Open();
        cmd.ExecuteNonQuery();
    }

    catch (Exception e)
    {
        conn.Close();
    }
}

但是，每当我尝试仅从数据库中检索日期到 DataGrid 时，仍然时间日期正在展示..

public DataTable OverDueCurrentTask()
{

    SqlConnection conn = new SqlConnection(connectionString);
    try
    {

        DateTime DateToday = DateTime.UtcNow.Date;
        string query = "DECLARE @sDate Date SET @sDate = '" + DateToday.Date + "' SELECT Title, Subject, Type, DueDate FROM Tbl_Task WHERE DueDate >= @sDate";

        SqlCommand cmd = new SqlCommand(query, conn);
        conn.Open();
        cmd.ExecuteNonQuery();

        SqlDataAdapter dataAdp = new SqlDataAdapter(cmd);
        DataTable dataTbl = new DataTable("Tbl_Task");
        dataAdp.Fill(dataTbl);
        dataAdp.Update(dataTbl);
        return dataTbl;

    }

    catch (Exception e)
    {

        conn.Close();
        return null;

    }
}

如何在不显示时间的情况下显示日期？注：在数据库中，DueDate是日期类型列。

Answer 1

我相信你也可以在C＃中做到这一点。在SQL查询中，您可以使用：

select cast([date] as date) as dateonly

将datetime转换为date。

以下编辑由Dan Guzman提供：

构建应用程序所需的查询字符串的C＃代码是：

string query = "DECLARE @sDate Date SET @sDate = '" + DateToday.Date + "' SELECT Title, Subject, Type, CAST(DueDate AS date) AS DueDate FROM Tbl_Task WHERE DueDate >= @sDate;";

Answer 2

您需要投放DueDate列cast([DueDate] as date) > = @sDate。虽然sDate已被声明为date。

string query = @"DECLARE @sDate Date SET @sDate = '" + DateToday.Date + "' 
               SELECT Title, Subject, Type, cast([DueDate] as date) as DueDate FROM Tbl_Task 
               WHERE cast([DueDate] as date) >= @sDate";

虽然它完成了答案，但您需要对代码进行细微更改，以避免SQL注入攻击。使用SqlCommand Parameters。在代码中添加using块。

仅显示SQL数据库中的日期

2 个答案: