如何添加多個記錄添加到數據庫從datagridview c＃

Question

我試過下面的代碼，但我可以添加一行記錄只添加到mysql數據庫。我輸入了三行記錄，但只添加了一行記錄。問題是什麼？

for (int i = 0; i < dataGridView1.Rows.Count; i++) 
    { 

     MySqlCommand cmd = new MySqlCommand(); 
     cmd.Connection = con; 

     cmd.CommandText = "insert into salesproductnew(salesid,productname,qty,price,grosstotal)values(@salesid,@productname,@qty,@price,@grosstotal)"; 


     cmd.Parameters.AddWithValue("@salesid", lbinvoice.Text); 
     cmd.Parameters.AddWithValue("@productname", dataGridView1.Rows[i].Cells[2].Value); 
     cmd.Parameters.AddWithValue("@qty", dataGridView1.Rows[i].Cells[3].Value); 
     cmd.Parameters.AddWithValue("@price", dataGridView1.Rows[i].Cells[4].Value); 
     cmd.Parameters.AddWithValue("@grosstotal", dataGridView1.Rows[i].Cells[5].Value); 

     con.Open(); 
     cmd.ExecuteNonQuery(); 

     MessageBox.Show("Record added ............."); 
     con.Close(); 

    } 

Answer 1

您沒有重置您的cmd的參數，您正在每個週期添加新參數。可能沒有正面回答，只是試試這個

MySqlCommand cmd = new MySqlCommand(); 
cmd.Connection = con; 
con.Open(); 
cmd.CommandText = "insert into salesproductnew(salesid,productname,qty,price,grosstotal)values(@salesid,@productname,@qty,@price,@grosstotal)"; 
for (int i = 0; i < dataGridView1.Rows.Count; i++) 
{ 
    cmd.Parameters.Clear(); 
    cmd.Parameters.AddWithValue("@salesid", lbinvoice.Text); 
    cmd.Parameters.AddWithValue("@productname", dataGridView1.Rows[i].Cells[2].Value); 
    cmd.Parameters.AddWithValue("@qty", dataGridView1.Rows[i].Cells[3].Value); 
    cmd.Parameters.AddWithValue("@price", dataGridView1.Rows[i].Cells[4].Value); 
    cmd.Parameters.AddWithValue("@grosstotal", dataGridView1.Rows[i].Cells[5].Value); 

    cmd.ExecuteNonQuery(); 

} 

    MessageBox.Show("Record added ............."); 
    con.Close(); 

順便說一句，你不必明確的參數。有關更多信息，請參見this SO。