將datagridview的所有數據插入數據庫C＃

Question

我有一個datagridview，它由各種操作和用戶對數據的操作創建。 我想立即將gridview的所有數據插入數據庫，我知道我可以嘗試類似這樣的代碼：

private void btnSaveProducts_Click(object sender, EventArgs e)
{
    SqlConnection connection = DBConnectivity.getConnection();
    if (connection != null)
    {
        try
        {
            for (int i = 0; i < dGvProducts.Rows.Count; i++)
            {
                string query = "INSERT INTO product (productName) " + "VALUES (@productName)";
                SqlCommand command = DBConnectivity.getCommandForQuery(query, connection);
                    int result = command.ExecuteNonQuery();
                    Console.WriteLine(result + "");
            }
            //  string query = "Insert into units(name,packing)values('" + txtNameUnit.Text + "' , '" + txtPackingUnit.Text + "')";
            //  SqlCommand command = DBConnectivity.getCommandForQuery(query, connection);
            //  int result = command.ExecuteNonQuery();
            //  Console.WriteLine(result + "");
        }
        catch (Exception ex)
        {
        }
        finally
        {
            connection.Close();    
        }
    }       
}

Answer 1

原樣，代碼嘗試執行參數化查詢，但從不為參數賦值。 即使你這樣做，也永遠不會提取單元格值。

代碼應該如下所示：

var query = "INSERT INTO product (productName) VALUES (@productName)";

using var(connection = DBConnectivity.getConnection())
using(var command = new SqlCommand(query, connection))
{
    var productParam=command.Parameters.Add("@productName",SqlDbType.NVarChar,50);

    connection.Open();
    for (int i = 0; i < dGvProducts.Rows.Count; i++)
    {                    
        var productName=dGvProducts.Rows[i].Cells[somecolumn].Value;
        productParam.Value=productName;
        int result = command.ExecuteNonQuery();
        Console.WriteLine(result);
    }       
}