我如何从数据表中清除会话存储的数据 [英] how can i clear session stored data from Data table
问题描述
我正在开发此页面中的网页,我正在下订单并添加多个项目.
在这里,我正在使用一个会话变量来存储这些值,然后显示在数据表中,但是现在我无法计算不同变量的总计,也无法将这些值存储到数据库中.
当我将值存储到数据库时,仅保存了最后一条记录.
我在这里使用两个表
1.product_order
product_id
product_name
product_rate
product_quantity
product_amount
2.product_order详情
product_id
order_id
product_name
product_quantity
product_total
我的代码是
Hi,
I am developing a web page in this page i am placing a order with more then one items.
here i am using a session variable to store these value and then display in datatable but now i am unable to calculation of total for different variable and unable to store these value to database.
when i storing value to database only last record saved.
Here i am using two tables
1.product_order
product_id
product_name
product_rate
product_quantity
product_amount
2.product_order detail
product_id
order_id
product_name
product_quantity
product_total
my code is
protected void Createdatatable()
{
DataTable dt = new DataTable();
//dt.Columns.Add("Id");
dt.Columns.Add("Product_Name");
dt.Columns.Add("Product_Quantity");
dt.Columns.Add("Product_Amount");
Session["address"] = dt;
}
protected void btnAdd_Click(object sender, EventArgs e)
{
double a, b;
a = double.Parse(txtqty.Text);
b = a * double.Parse(LblRate1.Text);
txtAmount.Text = b.ToString();
dt = (DataTable)Session["Address"];
dr = dt.NewRow();
dr["Product_Name"] = DropDownList1.SelectedItem.Text;
dr["Product_Quantity"] = txtqty.Text;
dr["product_rate"] = LblRate1.Text;
dr["Product_Amount"] = txtAmount.Text;
dt.Rows.Add(dr);
dt.AcceptChanges();
GridView1.DataSource = dt;
GridView1.DataBind();
GridView1.Visible = true;
}
<pre lang="cs">}
protected void btnSubmit_Click(object sender, EventArgs e)
{
grandtotal();
try
{
con.Open();
cmd = new SqlCommand("insert into product_customer(customer_name,customer_phone,customer_address)values(@customer_name,@customer_phone,@customer_address)", con);
cmd.Parameters.Add("@customer_name", SqlDbType.NVarChar).Value = txtName.Text;
cmd.Parameters.Add("@customer_phone", SqlDbType.NVarChar).Value = TxtPhone.Text;
cmd.Parameters.Add("@customer_address", SqlDbType.NVarChar).Value = txtAddress.Text;
cmd.ExecuteNonQuery();
cmd = new SqlCommand("insert into product_order(product_name,product_quantity,product_amount,product_total_amount)values(@product_name,@product_quantity,@product_amount,@product_total_amount)", con);
cmd.Parameters.Add("@product_name", SqlDbType.NVarChar).Value = DropDownList1.SelectedItem.Text;
cmd.Parameters.Add("@product_quantity", SqlDbType.NVarChar).Value = txtqty.Text;
cmd.Parameters.Add("@product_amount", SqlDbType.NVarChar).Value = txtAmount.Text.ToString();
cmd.Parameters.Add("@product_total_amount", SqlDbType.NVarChar).Value = txtTotalAmount.Text.ToString();
cmd.ExecuteNonQuery();
cmd.Dispose();
}
将所有插入值存储在数据库中的方式是什么.
what is the way to store all inserted value in database.
and how we make clear clear data table.
推荐答案
您可以像这样计算值:
Hi,
you can calculate value like:
//Now you can convert Session object to DataTable to retrive values.
DataTable dtRetrived = (DataTable)Session["address"];
//Iterate each row with value
int Total = 0;
for (int r = 0; r < dtRetrived.Rows.Count; r++)
{
//Calculate total value
Total += Convert.ToInt32(dtRetrived.Rows[r]["roduct_Quantity"]) * Convert.ToInt32(dtRetrived.Rows[r]["Product_Amount"]);
}
如有任何疑问,请让我知道.
如果对您有帮助,请提供投票.
谢谢,
Imdadhusen
Please do let me know, if you have any doubt.
Please provide Vote if this would be helpful to you.
Thanks,
Imdadhusen
Session["address"] = null
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