如何添加多个记录添加到数据库从datagridview c＃

Question

我试过下面的代码，但我可以添加一行记录只添加到mysql数据库。我输入了三行记录，但只添加了一行记录。问题是什么？

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

您没有重置您的cmd的参数，您正在每个周期添加新参数。可能没有正面回答，只是试试这个

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(); 

顺便说一句，你不必明确的参数。有关更多信息，请参见this SO。