You cannot use Top in the database. You can use this method later... This method summarizes and writes a page. If you are interested, you can study together ....
Front-end code:
Copy codeThe Code is as follows:
<% @ Page Language = "C #" AutoEventWireup = "true" CodeFile = "ajaxRandomData. aspx. cs" Inherits = "ajaxRandomData" %>
<! 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> randomly generated ajax data </title>
<Script language = "javascript" type = "text/javascript" src = "ajax/jquery. js"> </script>
<Script>
// Page Initialization
$ (Document). ready (function () {randomData ()});
// Page initialization Function
Function randomData ()
{
$. Ajax ({
Type: 'post ',
Url: 'ajaxrandomdata. aspx ',
Data: {action: 'rand '},
Success: randomDatacallbace
});
}
// Page initialization callback function
Function randomDatacallbace (data)
{
If (data = "")
{
Alert ("data cannot be generated for you temporarily ");
$ ("# RandomData" ).html ("data cannot be generated for you temporarily ");
}
Else
{
$ ("# RandomData" pai.html (data );
Randomtime (); // execute once every 5 seconds
}
}
// The data displayed on the Dynamic Change page.
Function randomtime ()
{
SetTimeout (function () {randomData ()}, 2000)
}
</Script>
</Head>
<Body>
<Form id = "form1" runat = "server">
<Div style = "text-align: center" id = "randomData">
</Div>
</Form>
</Body>
</Html>
Background code:
Copy codeThe Code is as follows:
Using System;
Using System. Data;
Using System. Configuration;
Using System. Collections;
Using System. Web;
Using System. Web. Security;
Using System. Web. UI;
Using System. Web. UI. WebControls;
Using System. Web. UI. WebControls. WebParts;
Using System. Web. UI. HtmlControls;
Using System. Data. SqlClient;
Using System. Text;
Public partial class ajaxRandomData: System. Web. UI. Page
{
String StrAction = "";
Protected void Page_Load (object sender, EventArgs e)
{
StrAction = Request ["action"];
If (StrAction = "randon ")
{
InitData ();
}
}
/// <Summary>
/// Created by Zhou Xin
/// Creation Time: 2009-6-9
/// Method Name: InitData
/// Method: dynamically generate a table and randomly generate 5 data entries
/// </Summary>
Public void InitData ()
{
SqlConnection mycon = new SqlConnection ();
Mycon. ConnectionString = ConfigurationManager. ConnectionStrings ["BoBoConn"]. ToString ();
// Key to random data generation
String SQL = "select top 5 *, newid () from loginuser order by newid ()";
SqlDataAdapter myda = new SqlDataAdapter (SQL, mycon );
DataSet myset = new DataSet ();
Myda. Fill (myset );
DataTable mytable = myset. Tables [0];
Int n = mytable. Rows. Count;
StringBuilder str = new StringBuilder ();
Str. append ("<table style = 'text-align: left; color: red; width: 600px '> <tr style = 'color: #00FF00; font-size: 40px; text-align: Center'> <td colspan = '3'> dynamically refresh User Information </td> </tr> <tr style = 'color: # 6600FF '> <td style = 'text-align: left; width: 100px'> User Name </td> <td style = 'text-align: left; width: 200px '> full user name </td> <td style = 'width: 250px'> electronic fuel tank </td> </tr> ");
For (int I = 0; I <n; I ++)
{
String username = mytable. Rows [I] ["username"]. ToString ();
String fullname = mytable. Rows [I] ["FullName"]. ToString ();
String email = mytable. Rows [I] ["Email"]. ToString ();
If (I % 2! = 0)
{
Str. Append ("<tr> <td>" + username + "</td> ");
Str. Append ("<td>" + fullname + "</td> ");
Str. Append ("<td>" + email + "</td> </tr> ");
}
Else
{
Str. Append ("<tr style = 'color: Blue'> <td>" + username + "</td> ");
Str. Append ("<td>" + fullname + "</td> ");
Str. Append ("<td>" + email + "</td> </tr> ");
}
}
Str. Append ("</table> ");
Response. Clear ();
Response. ContentType = "application/text ";
Response. Write (str );
Response. End ();
}
}
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