Question

我将在图片和源代码中解释它

前端设计

后端代码

private void AddRecord(object sender, RoutedEventArgs e)
    {
        string date = datee.Text + " " + DateTime.Now.ToLongTimeString();
        if (datee.Text == "" || cusname.SelectedValue == null || Vanda.SelectedValue == null || price.SelectedValue == null || bags.Text == "")
        {
            MessageBox.Show("please fill the data");
        }
        else
        {

            DataRowView dt = (DataRowView)Vanda.SelectedItem;
            string vda = dt["vanda"].ToString();
            DataRowView dt2 = (DataRowView)price.SelectedItem;
            string data2 = dt2["price"].ToString();
            decimal dta = Convert.ToDecimal(data2);
            Int32 pricee = Convert.ToInt32(dta);
            decimal bag = Convert.ToDecimal(bags.Text);
            decimal credit = pricee * bag;
            DataRowView cus = (DataRowView)cusname.SelectedItem;

            string cusidd = cus["id"].ToString();
            int cusid = Convert.ToInt16(cusidd);
            con.Open();
            SqlCommand cmd5 = new SqlCommand("SELECT price - retailprice FROM vanda where vanda = '" + vda + "' and price = '" + pricee + "'", con);
            SqlDataReader reader = cmd5.ExecuteReader();
            reader.Read();
            string val = reader.GetValue(0).ToString();
            decimal valu = Convert.ToDecimal(val);
            Int32 profit = Convert.ToInt32(valu);
            reader.Close();
            SqlCommand cmd3 = new SqlCommand("insert into records (cusid,datee,description,vanda,price,bag,credit,debit,profit) values ('" + cusid + "','" + date + "','" + des.Text + "','" + vda + "','" + pricee + "','" + bags.Text + "','" + credit + "','','"+profit+"')", con);
            cmd3.ExecuteNonQuery();
            MessageBox.Show("Data Inserted");  
            con.Close();

        }

    }

DataGrid代码

private void enddate_SelectedDateChanged(object sender, SelectionChangedEventArgs e)
    {
        if (startdate.Text == "")
        {
            MessageBox.Show("Please Select Starting Date");
        }
        else
        {
            con.Open();
            SqlDataAdapter adapter = new SqlDataAdapter(" i need here Query ", con);
            DataSet ds = new DataSet();
            adapter.Fill(ds);
            data.DataContext = ds.Tables[0];
        }

    }

SQL Server数据库

我希望你能清楚地理解它。现在清除错误并改进我的代码/逻辑/查询（^ _ ^）。 bla bla bla bla bla bla bla bla bla bla bla

Answer 1

select r.datee,c.name,r.description,r.vanda,r.price,r.bag,r.credit,r.debit 
from records  r
JOIN    customer  c ON  r.cusid = c.id 
WHERE c.name = 'aizaz' AND DateColumn BETWEEN StartDate AND EndDATE

Answer 2

首先，您的SQL应该使用命名参数来避免SQL注入攻击：

select r.datee,c.name,r.description,r.vanda,r.price,r.bag,r.credit,r.debit
from records as r,
     customer as c 
where r.cusid = c.id 
      and c.name = @cname
      and r.datee BETWEEN @startDate AND @endDate

当您创建要传递给查询的变量时，请按以下格式对其进行格式化：

var startDate = DateTime.Parse(datee.Text).ToString("M/d/yyyy");
var endDate = DateTime.Now.ToString("M/d/yyyy") + " 23:59:59";

这会将日期值转换为数据库所需的格式。

Answer 3

数据库不以任何特定的字符串格式存储日期。日期是日期，没有特定的格式。格式化日期的输出是一个UI事物。

您使用DateTime属性获得DatePicker的实际SelectedDate值。您应该将这些值作为参数传递给您的命令：

SqlCommand cmd = new SqlCommand("select r.datee,c.name,r.description,r.vanda,r.price,r.bag,r.credit,r.debit from records as r, customer as c where r.cusid = c.id and c.name = @cname and r.datee BETWEEN @startDate AND @endDate");
cmd.Parameters.AddWithValue("@startDate", datePicker1.SelectedDate.Value.Date);
cmd.Parameters.AddWithValue("@endDate", datePicker2.SelectedDate.Value.Date.AddHours(23).AddMinutes(59).AddSeconds(59));

如何从SQL Server的日期到日期获取记录

3 个答案: