asp.net学习笔记·将数据库中的数据保存在EXCEL文件中

提取数据库中的数据，将其保存在EXCEL文件中，并提供下载。

在一般处理程序中将数据库数据保存在EXCEL文件中的代码

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using NPOI.HSSF.UserModel;
using good.DAl;
using System.Data;

namespace good
{
    /// <summary>
    /// excel 的摘要说明
    /// </summary>
    public class excel : IHttpHandler
    {

        Sql sql = new Sql();
        IDataReader reader;
        public void ProcessRequest(HttpContext context)
        {

            context.Response.ContentType = "application/x-excel";  //设置类型
            string filename = HttpUtility.UrlEncode("动态数据.xls");
            context.Response.AddHeader("Content-Disposition","attachment;filename=" + filename);

            reader = sql.GetReader();
            HSSFWorkbook workbook = new HSSFWorkbook();//新建EXCEL文件
            HSSFSheet sheet = workbook.CreateSheet();//新建页
            if (reader!= null )
            {
                while (reader.Read())
                {
                    int i = 0;
                    string userName = reader.GetString(reader.GetOrdinal("Name"));
                    int  id = (int)reader.GetValue(reader.GetOrdinal("ID"));
                    HSSFRow row = sheet.CreateRow(i);  //创建行
                    row.CreateCell(0, HSSFCell.CELL_TYPE_STRING).SetCellValue(userName);//创建cell并给Cell设置数据类型以及数据
                    row.CreateCell(1, HSSFCell.CELL_TYPE_NUMERIC).SetCellValue(id);
                }
                workbook.Write(context.Response.OutputStream);//将生成的EXCEL文件流输出到上下文中
            }
            else
            {
                
            }
           
            //HSSFWorkbook workbook = new HSSFWorkbook();
            //HSSFSheet sheet = workbook.CreateSheet();
            //HSSFRow row1 = sheet.CreateRow(0);
            //HSSFCell cell1 = row1.CreateCell(0, HSSFCell.CELL_TYPE_STRING);
            //cell1.SetCellValue("你好");
           

           
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }
    }
}

　　

操作数据库的代码

 public IDataReader GetReader()
        {
            SqlConnection conn = new SqlConnection(strConn);
            try
            {
                
                conn.Open();
                string strCmd = "select * from Person";
                SqlCommand cmd = new SqlCommand(strCmd,conn);
                IDataReader reader = cmd.ExecuteReader();
                return reader;
            }
            catch (Exception ex)
            {

                Console.WriteLine(ex.Message);
                return null;
            }
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