在asp.net中使用sql命令时，“字段列表”中的未知列“新建”

Question

我尝试在更新时使用asp.net更新GridView，但我传递了文本框值，但出现上述错误。

Label l1 = g1.Rows[e.RowIndex].FindControl("idlbl") as Label;
TextBox t1 = g1.Rows[e.RowIndex].FindControl("typeText") as TextBox;

string orderType = t1.Text;
string Query = @"update app_order_master set order_amt=" + orderType + " where order_id=" + l1.Text;
MySqlCommand cmd = new MySqlCommand(Query);            
cmd.Connection = sqlconn;
cmd.ExecuteNonQuery();

Answer 1

尝试改用参数

Label l1 = g1.Rows[e.RowIndex].FindControl("idlbl") as Label;
TextBox t1 = g1.Rows[e.RowIndex].FindControl("typeText") as TextBox;

string orderType = t1.Text;
string order_id = l1.Text;
string Query = "update app_order_master set order_amt = @orderType where order_id = @order_id";
MySqlCommand cmd = new MySqlCommand(Query);      
cmd.Parameters.Add("@orderType", orderType);      
cmd.Parameters.Add("@order_id", order_id);     
cmd.Connection = sqlconn;
cmd.ExecuteNonQuery();