我在POS系统上工作,我的问题是当我在数据网格上添加现有项目时,它只会添加相同的项目,例如
这是产品信息:
单击“确定”时的输出:
private void add_Click(object sender, EventArgs e)
{
DateTime d = DateTime.Now.Date;
if (Buy.Text == "")
{
MessageBox.Show("Quantity required", "ADD", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
else
{
try
{
conn = koneksyon.getConnect();
conn.Open();
cmd = new SqlCommand("select PurchaseNo from Purchase where CustomerNO = '" + CustomerID.Text + "'", conn);
dr = cmd.ExecuteReader();
while (dr.Read())
{
label18.Text = dr[0].ToString();
}
if (label18.Text == OR.Text)
{
conn = koneksyon.getConnect();
conn.Open();
cmd = new SqlCommand("delete from Purchase where PurchaseNo ='" + dataGridView1.CurrentRow.Cells[6].Value + "'And CustomerNO ='" + CustomerID.Text + "'", conn);
cmd.ExecuteNonQuery();
cmd.Dispose();
conn.Close();
label18.ResetText();
}
dr.Dispose();
int t = 0;
conn = koneksyon.getConnect();
conn.Open();
string fullname = fName.Text + " " + lName.Text;
cmd = new SqlCommand("insert into Purchase(PurchaseNo, CustomerNO,StaffID) values ('"
+ OR.Text + "','"
+ CustomerID.Text + "','"
+ txtStaffID.Text + "')", conn);
cmd.ExecuteNonQuery();
cmd = new SqlCommand("insert into Details(PurchaseNo, ProductID, Quantity, Price, Subtotal) values ('"
+ OR.Text + "','"
+ itemID.Text + "','"
+ Buy.Text + "','"
+ Price.Text + "','"
+ Subtotal.Text + "')", conn);
cmd.ExecuteNonQuery();
MessageBox.Show("Item Added");
cmd = new SqlCommand("select Qty from Product where ProductID ='" + itemID.Text + "'", conn);
dr = cmd.ExecuteReader();
while (dr.Read())
{
t = Convert.ToInt32(itemQty.Text) - Convert.ToInt32(Buy.Text);
}
dr.Dispose();
cmd = new SqlCommand("UPDATE Product set Qty ='" + t + "' where ProductID ='" + itemID.Text + "'", conn);
cmd.ExecuteReader();
dr.Dispose();
conn = koneksyon.getConnect();
conn.Open();
dataGridView1.Rows.Clear();
dataGridView1.Visible = true;
//cmd = new SqlCommand("Select a.ProductID, a.Description, a.Qty, b.Price, b.SupplierID from Product as a inner join Inventory as b on a.ProductID = b.ProductID", con);
cmd = new SqlCommand("Select b.ProductID,c.Description, b.Quantity,b.Price, b.Subtotal , a.CustomerNO, b.PurchaseNo from Details as b inner join Purchase as a on b.PurchaseNo= a.PurchaseNo join Product c on c.ProductID = b.ProductID where CustomerNO ='" + CustomerID.Text + "'", conn);
dr = cmd.ExecuteReader();
while (dr.Read())
{
dataGridView1.Rows.Add(dr[0], dr[1], dr[2], dr[3], dr[4], dr[5], dr[6]);
}
dr.Dispose();
//cmd = new SqlCommand("Update Purchase Set PurchaseNo ='" + OR.Text + "', CustomerNO ='" + CustomerID.Text + "'", conn);
//cmd.ExecuteNonQuery();
itemID.Clear();
Price.Clear();
itemDesc.Clear();
itemQty.Clear();
Subtotal.Clear();
Buy.Enabled = false;
Buy.Clear();
itemCode.Clear();
itemCode.Focus();
button2.Enabled = true;
}
catch (Exception)
{
}
}
}
现在我的问题是,当我添加另一个相同的项目时,它将显示如下:
,我想显示它像这样,但我不知道该怎么做: