DataReader的例子

时间：2022-06-27 23:24:44

前：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="DataReader对象.aspx.cs" Inherits="WebApplication1.DataReader对象" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <div>

    <table border="" cellpadding="" cellspacing="">

    <tr><td>编号</td><td>账号</td><td>真实姓名</td><td>年龄</td><td>

      性别</td><td>手机</td><td>电话</td><td>电子邮件</td></tr>

      <%

         ShowData();

           %>

    </table>

    </div>

    </form>

</body>

</html>

后台Cs：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data.SqlClient;

using System.Data;

namespace WebApplication1

{

    public partial class DataReader对象 : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

        }

       public void ShowData()

        {

            SqlConnection conn = new SqlConnection(@"server=Rose-PC\SQLEXPRESS;Database=User;User Id=sa;password=");

            SqlCommand command =new SqlCommand("Select * from UserInfo where Sex=1",conn);

            conn.Open();

            //得到DataReader的实例   注意：使用CommandBehavior这个参数

           //以便同时关闭Connection

            SqlDataReader reader = command.ExecuteReader(CommandBehavior.CloseConnection);

           //如果当前记录还有下一条记录，则循环不会终止

           while (reader.Read())

            {

               //按着列顺序和对应类型直接读取值

                Response.Write("<tr><td>" + reader.GetInt32() + "</td>");

                Response.Write("<td>" + reader.GetString() + "</td>");

                Response.Write("<td>" + reader.GetString() + "</td>");

                Response.Write("<td>" + reader.GetByte() + "</td>");

                //下面是按着列顺序直接读取值，并且根据值来判断最终显示结果

                Response.Write("<td>" + (reader.GetBoolean()==true?"男":"女" )+ "</td>");

               //按着列顺序读取,列的值需要做相应的转换

                Response.Write("<td>" + reader[].ToString() + "</td>");

                Response.Write("<td>" + reader["Phone"] + "</td>");

                Response.Write("<td>" + reader["Email"].ToString() + "</td></tr>\n");

            }

            reader.Close();

        }

    }

}

显示的图片：DataReader的例子

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