应该如何理解被注释的地方

提问者：花依樣小颖  |  浏览 次  |  提问时间：2017-01-17  |  回答数量：2

using System;using System.Collections.Generic;using System.Text;using System.Data;using System.Data.SqlClient;namespace ClassLibrary3{ public class Class1 { private static readonly string URL = \"Data Source=.;Initial Catalog=MyQQ;Integrated Security=True\"; private static SqlConnection conn = new SqlConnection(URL); public static int ExecuteNonQuery(string sql) { try { SqlCommand comm = new SqlCommand(sql, conn); conn.Open(); return comm.ExecuteNonQuery(); } catch (Exception ex) { throw ex; }