用ASP.NET2.0如何随机读取Access记录？(1)
由于使用ADO访问Access数据库会有缓存，这在随机提取数据库数据时，例如：sql="select top 10 Title,objectGuid from Document Order By Rnd(id)"，将得不到随机记录，下面的例子可以克服这一缺陷，实现数据库的随机读取。
C#：
<%@ Page Language="C#" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> protected void Page_Load( object sender, EventArgs e ) { Random rnd = new Random(unchecked((int)DateTime.Now.Ticks)); int intRandomNumber = rnd.Next(); string ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source= DataDirectory ASPxWeb.mdb;Persist Security Info=True"; string sql = "select top 10 Title,objectGuid from Document Order By Rnd(" + (-1 * intRandomNumber) + "*id)"; System.Data.OleDb.OleDbConnection cn = new System.Data.OleDb.OleDbConnection(ConnectionString); cn.Open(); System.Data.OleDb.OleDbCommand cmd = new System.Data.OleDb.OleDbCommand(sql, cn); System.Data.OleDb.OleDbDataReader dr = cmd.ExecuteReader(System.Data.CommandBehavior.CloseConnection); GridView1.DataSource = dr; GridView1.DataBind(); dr.Close(); cmd.Dispose(); cn.Dispose(); cn = null; } </script> <html XMLns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title>随机读取Access数据库记录</title> </head> <body> <form id="form1" runat="server"> <div> <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="false">
