using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.IO;
namespace _02导出数据
{
    class Program
    {
        static void Main(string[] args)
        {
            string str = "Data Source=XY-PC;Initial Catalog=MyItcast;Integrated Security=True";
            using (SqlConnection con=new SqlConnection(str))
            {
                string sql = "select UserId, UserName, UserPwd from UserLogin";
                using (SqlCommand cmd=new SqlCommand(sql,con))
                {
                    con.Open();
                    using (SqlDataReader reader=cmd.ExecuteReader())
                    {
                        if (reader.HasRows)
                        {

                            using (StreamWriter sw=new StreamWriter("1.txt"))
                            {
                                sw.WriteLine("{0},{1},{2}", reader.GetName(0), reader.GetName(1), reader.GetName(2));//获取指定列的名称，参数是下标，只写一次，因此放在循环外面
                                while (reader.Read())
                                {

                                    sw.WriteLine("{0},{1},{2}",reader[0],reader[1],reader[2]);//获取指定列的value，参数是下标
                                }// end while
                            }//end using
                           
                        }// end if
                    }// end using
                }//end using

            }// end using
            Console.WriteLine("我要用计算机控制挖掘机炒菜");
            Console.ReadKey();
        }
    }
}