使用C＃对MySQL进行参数化查询

尝试以下方法：

private String readCommand =   "SELECt LEVEL FROM USERS WHERe VAL_1 = @param_val_1 AND VAL_2 = @param_val_2;";public bool read(string id){    level = -1;    MySqlCommand m = new MySqlCommand(readCommand);    m.Parameters.AddWithValue("@param_val_1", val1);    m.Parameters.AddWithValue("@param_val_2", val2);    level = Convert.ToInt32(m.ExecuteScalar());    return true;}