793291696servertotxt-爱代码爱编程

server to txt

首先定义了连接字符串connStr和查询语句query。然后使用SqlConnection类和SqlCommand类连接数据库，并执行查询语句，获取到SqlDataReader对象reader。接着使用StreamWriter类将数据写入txt文件，使用String.Format方法将每行数据格式化后写入txt文件中。

program.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace readtxttoxml
{
    internal class Program
    {
        static void Main(string[] args)
        {
            string connStr = "Data Source=localhost;Initial Catalog=scnt;Integrated Security=True;";
            string query = "SELECT * FROM student";

            using (SqlConnection conn = new SqlConnection(connStr))
            {
                using (SqlCommand cmd = new SqlCommand(query, conn))
                {
                    conn.Open();
                    SqlDataReader reader = cmd.ExecuteReader();

                    // Write data to txt file
                    using (StreamWriter writer = new StreamWriter("D:/DDD/students.txt"))
                    {
                        while (reader.Read())
                        {
                            string data = String.Format("{0}\t{1}\t{2}\t", reader["ID"], reader["Name"],  reader["Gender"]);
                            writer.WriteLine(data);
                        }
                    }
                }
            }
        }
    }
}