如何随机得到Access数据库记录

2016-02-19 15:51 3 1 收藏

今天天气好晴朗处处好风光，好天气好开始，图老师又来和大家分享啦。下面给大家推荐如何随机得到Access数据库记录，希望大家看完后也有个好心情，快快行动吧！

【 tulaoshi.com - 编程语言】

由于Access数据库记录集缓存的原因，从代码里得到Access数据库随机记录是得不到，需要用随机SQL语句的办法来消除缓存。

下面就是例子：

查看例子

%@ Page Language="C#" Debug="true" %
%@ import Namespace="System.Data" %
%@ import Namespace="System.Data.OleDb" %
title随机得到Access数据库记录/title
script runat="server"
void Page_Load(Object src,EventArgs e)
{
if(!IsPostBack)
{
string MyConnString = "Provider=Microsoft.Jet.OleDB.4.0;Data Source="
+ Server.MapPath("aspxWeb.mdb.ascx");
Random R = new Random();
int intRandomNumber = R.Next(1,1000);

string sql = "select top 10 id As 序号,Title As 标题 from Document Order By Rnd("
+ (-1 * intRandomNumber).ToString() + "*id)";
OleDbConnection MyConnection = new OleDbConnection(MyConnString);
MyConnection.Open();
OleDbCommand cmd = new OleDbCommand(sql,MyConnection);
OleDbDataReader dr = cmd.ExecuteReader();

DataGrid1.DataSource = dr;
DataGrid1.DataBind();
cmd.Dispose();
MyConnection.Close();
MyConnection.Dispose();
MyConnection = null;
}
}

/script
form runat=server
asp:DataGrid id="DataGrid1" HorizontalAlign="Center"
Width="600px" runat="server" Font-Size="9pt"
AlternatingItemStyle BackColor="#EEEEEE"/AlternatingItemStyle
HeaderStyle BackColor="#AAAADD" Font-Bold="True" HorizontalAlign="Center" /
/asp:DataGrid
/form

来源:http://www.tulaoshi.com/n/20160219/1610563.html