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Paging Technology for JSP Database Query

Source: Internet
Author: User
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Package bean;

Public class page {
Private int totalpage; // the total number of pages.
Private int currentpage; // the current page number.
Private int totalrecord; // The total number of records
Private int currentrecord; // number of current records
Private int pagesize = 1; // number of records displayed per page
 
Public int getcurrentpage (){
Return currentpage;
}
 
Public void setcurrentpage (INT pcurrentrecord, int ppagesize ){
If (currentrecord % pagesize = 0)
Currentpage = currentrecord/pagesize;
Else
Currentpage = currentrecord/pagesize + 1;
}
 
Public int getcurrentrecord (){
Return currentrecord;
}
 
Public void setcurrentrecord (INT pcurrentrecord ){
Currentrecord = pcurrentrecord;
}
 
Public int getpagesize (){
Return pagesize;
}
 
Public void setpagesize (INT ppagesize ){
Pagesize = ppagesize;
}
 
Public int gettotalpage (){
Return totalpage;
}
 
Public void settotalpage (INT ptotalrecord, int ppagesize ){
If (ptotalrecord % ppagesize = 0)
Totalpage = ptotalrecord/ppagesize;
Else
Totalpage = ptotalrecord/ppagesize + 1;
}
 
Public int gettotalrecord (){
Return totalrecord;
}
 
Public void settotalrecord (INT ptotalrecord ){
Totalrecord = ptotalrecord;
}
}

 

 

 

<% @ Page import = "Java. util. List" %>
<% @ Page import = "bean. Guest" %>
<% @ Page import = "Java. util. arraylist" %>
<% @ Page contenttype = "text/html; charset = UTF-8" Language = "Java"
Import = "Java. SQL. *" errorpage = "" %>
<! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<JSP: usebean id = "DB" class = "bean. ormdbutil" Scope = "page"> </jsp: usebean>
<JSP: usebean id = "pager" class = "bean. Page" Scope = "page"> </jsp: usebean>
<%
String SQL = "select * from guests ";
Int currentrecord = 0;
Arraylist <guest> result = dB. Select (SQL );
Pager. settotalrecord (result. Size ());
Pager. settotalpage (result. Size (), pager. getpagesize ());

If (request. getparameter ("currentrecord ")! = NULL ){
Currentrecord = integer. parseint (request. getparameter ("currentrecord "));
Pager. setcurrentrecord (currentrecord );
Pager. setcurrentpage (currentrecord, pager. getpagesize ());
}

// Retrieve the subset to be displayed on the current page
List <guest> subresult = NULL;
If (currentrecord = 0 );
Subresult = result. sublist (0, pager. getpagesize ());
If (pager. getcurrentrecord () + pager. getpagesize () <result. Size ())
Subresult = result. sublist (pager. getcurrentrecord (),
Pager. getcurrentrecord () + pager. getpagesize ());
Else
Subresult = result. sublist (pager. getcurrentrecord (),
Result. Size ());
%>
<HTML xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>
<Title> an usage example on pages </title>
</Head>

<Body>
<Font size = "+ 2"> <strong> This page uses Javabean to display the page by page. </Strong> <br/>
The following table shows the running result. </font>
<Table width = "387" border = "1" Height = "47">
<Tr>
<TD Height = "41"> NO. </TD>
<TD> name </TD>
<TD> phone number </TD>
<TD> email </TD>
</Tr>
<%
If (subresult. isempty () = false ){
For (INT I = 0; I <subresult. Size (); I ++ ){
Guest guest = subresult. Get (I );
Out. Print ("<tr> ");
Out. Print ("<TD>" + guest. GETID () + "</TD> ");
Out. Print ("<TD>" + guest. getcname () + "</TD> ");
Out. Print ("<TD>" + guest. getphone () + "</TD> ");
Out. Print ("<TD>" + guest. getemail () + "</TD> ");
Out. Print ("</tr> ");
}
}
%>
</Table>
<Span> <font size = "+ 2"> total <% = pager. gettotalrecord () %> record | Total <% = pager. gettotalpage () %> page | current <% = pager. getcurrentpage () + 1%> page | each page
<% = Pager. getpagesize () %> | <%
If (pager. getcurrentrecord ()-pager. getpagesize () <0)
Out. Print ("homepage | ");
Else
Out. Print ("<a href = 'pagequery. jsp? Currentrecord ="
+ (Pager. getcurrentrecord ()-pager. getpagesize ())
+ "& Pagesize =" + pager. getpagesize () + "'> Previous Page, </a> | ");

If (pager. getcurrentrecord () + pager. getpagesize ()> Pager
. Gettotalrecord ())
Out. Print ("last page ");
Else
Out. Print ("<a href = 'pagequery. jsp? Currentrecord ="
+ (Pager. getcurrentrecord () + pager. getpagesize ())
+ "& Pagesize =" + pager. getpagesize () + "'> next page </a> | ");
%>
</Font> </span>
</Body>
</Html>

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