我如何在一天中的8:00至22:00 c＃datetimepickers的工作时间内搜索所有订单？

Question

我想在08:00 AM到22:00 pm的工作时间内一天内搜索所有订单，我使用了2个datetimepickers并选择了今天的日期，但是当我搜索不显示今天的所有订单时，我尝试了以下代码单击搜索按钮时：

private void BtnSearch_Click(object sender, EventArgs e)
{    

                string sql = @" SELECT [Order_Payments].[order_id] as 'Acc No.'
      ,order_vat as 'VAT value'
      ,vat_orders.[total_amount] as 'Total After VAT'
      ,[Order_Payments].paid_amount as 'Total Paid'
      ,[remaining_amount]
      ,vat_orders.order_date AS 'Order Date'
      ,Customers.CustName as 'Clinic'

  FROM [Order_Payments]
  inner join vat_orders on  [Order_Payments].order_id = vat_orders.ORDER_ID
  inner join Customers on  [Order_Payments].custid = Customers.CustId
  WHERE 1=1 ";

                string condition = "";
                string orderby = "";
                orderby += " ORDER BY Order_Payments.order_id";

                DateTime fromDate;
                DateTime toDate;


                if (!DateTime.TryParse(dtFromDate.Value.ToString(), out fromDate))
                {
                    System.Windows.Forms.MessageBox.Show("Invalid From Date");
                }
                else if (!DateTime.TryParse(dtToDate.Value.ToString(), out toDate))
                {
                    System.Windows.Forms.MessageBox.Show("Invalid to Date");
                }
                else
                {
                    condition += " and vat_orders.order_date between '" + fromDate + "' and '" + toDate + "'";
                }


                if (textCustId.Text != "")
                {
                    condition += " and Order_Payments.CUSTID ='" + textCustId.Text + "'";
                }


                DataTable dt = data.fireDatatable(string.Format(sql + condition + orderby));
                OrdersDataGridView.DataSource = dt;
                OrdersDataGridView.Refresh();


        }

我如何更新代码并搜索今天的订单，例如，2020年1月12日上午08:00至2020年1月12日至下午22:00？

或者我可以使用select语句来选择今天的日期，然后从SQL Server的时间00:00到22:00进行选择？

Answer 1

您可以使用CAST函数解决问题，并且可以在select语句的where子句中仅调用日期或时间：此链接说明强制转换功能https://www.w3schools.com/sql/func_sqlserver_cast.asp

    private void BtnSearch_Click(object sender, EventArgs e)
            {
                string sql = @" SELECT [Order_Payments].[order_id] as 'Acc No.'
          ,order_vat as 'VAT value'
          ,vat_orders.[total_amount] as 'Total After VAT'
          ,[Order_Payments].paid_amount as 'Total Paid'
          ,[remaining_amount]
          ,vat_orders.order_date 
          ,Customers.CustName as 'Clinic'

      FROM [Order_Payments]
      inner join vat_orders on  [Order_Payments].order_id = vat_orders.ORDER_ID
      inner join Customers on  [Order_Payments].custid = Customers.CustId
      WHERE cast(vat_orders.order_date as time) between '01:00:00' and '23:50:50' ";

                    string condition = "";
                    string orderby = "";
                    orderby += " ORDER BY Order_Payments.order_id";

                    DateTime fromDate;
                    DateTime toDate;


                    if (!DateTime.TryParse(dtFromDate.Value.ToString(), out fromDate))
                    {
                        System.Windows.Forms.MessageBox.Show("Invalid From Date");
                    }
                    else if (!DateTime.TryParse(dtToDate.Value.ToString(), out toDate))
                    {
                        System.Windows.Forms.MessageBox.Show("Invalid to Date");
                    }
                    else
                    {
                        condition += " and cast(vat_orders.order_date as date) between '" + fromDate + "' and '" + toDate + "'";
                    }


if (textCustId.Text != "")
            {
                condition += " and Order_Payments.CUSTID ='" + textCustId.Text + "'";
            }


            DataTable dt = data.fireDatatable(string.Format(sql + condition + orderby));
            OrdersDataGridView.DataSource = dt;
            OrdersDataGridView.Refresh();
    }

Answer 2

您需要将DateTime对象转换为SQL可以使用的字符串表示形式，最好

condition += " and vat_orders.order_date between '" + fromDate.ToString("o") + "' and '" + toDate.ToString("o") + "'";

您可以参考文档here

您可以参考另一个question来查看为什么使用“ o”（ISO 8601格式）