mysql Sql参数用?而不用@

mysql Sql参数用?而不用@

StringBuilder strSql = new StringBuilder();
strSql.Append("insert into COS_Order(");
strSql.Append("Ord_DiscountInformation,Ord_Suppliers)");
strSql.Append(" values (");
strSql.Append("?Ord_DiscountInformation,?Ord_Suppliers)");
MySqlParameter[] parameters = {
new MySqlParameter("?Ord_DiscountInformation", MySqlDbType.VarChar,255),
new MySqlParameter("?Ord_Suppliers", MySqlDbType.VarChar,255),
parameters[0].Value = model.Ord_DiscountInformation;
parameters[1].Value = model.Ord_Suppliers;