php 2007-7-14 10:36
PHP分页显示制作详细讲解
1、前言
分页显示是一种非常常见的浏览和显示大量数据的方法，属于web编程中最常处理的事件之一。对于web编程的老手来说，编写这种代码实在是和呼吸一样自然，但是对于初学者来说，常常对这个问题摸不着头绪，因此特地撰写此文对这个问题进行详细的讲解，力求让看完这篇文章的朋友在看完以后对于分页显示的原理和实现方法有所了解。本文适合初学者阅读，所有示例代码均使用php编写。
2、原理
所谓分页显示，也就是将数据库中的结果集人为的分成一段一段的来显示，这里需要两个初始的参数：
每页多少条记录（$PageSize）？
当前是第几页（$CurrentPageID）？
现在只要再给我一个结果集，我就可以显示某段特定的结果出来。
至于其他的参数，比如：上一页（$PreviousPageID）、下一页（$NextPageID）、总页数（$numPages）等等，都可以根据前边这几个东西得到。
以mysql数据库为例，如果要从表内截取某段内容，sql语句可以用：select * from table limit offset, rows。看看下面一组sql语句，尝试一下发现其中的规率。
前10条记录：select * from table limit 0,10
第11至20条记录：select * from table limit 10,10
第21至30条记录：select * from table limit 20,10
……
这一组sql语句其实就是当$PageSize=10的时候取表内每一页数据的sql语句，我们可以总结出这样一个模板：
select * from table limit ($CurrentPageID - 1) * $PageSize, $PageSize
拿这个模板代入对应的值和上边那一组sql语句对照一下看看是不是那么回事。搞定了最重要的如何获取数据的问题以后，剩下的就仅仅是传递参数，构造合适的sql语句然后使用php从数据库内获取数据并显示了。以下我将用具体代码加以说明。
3、简单代码
请详细阅读以下代码，自己调试运行一次，最好把它修改一次，加上自己的功能，比如搜索等等。
[color=#000000][color=#0000cc]<[/color][color=#0000cc]?[/color][color=#0000ff]php[/color]
[color=#ff9900]// 建立数据库连接
[/color]
[color=#0000ff]$[/color][color=#008080]link[/color] [color=#0000cc]=[/color] [color=#ff0000]mysql_connect[/color][color=#0000cc]([/color][color=#ff00ff]"localhost"[/color][color=#0000cc],[/color] [color=#ff00ff]"mysql_user"[/color][color=#0000cc],[/color] [color=#ff00ff]"mysql_password"[/color][color=#0000cc])[/color]
or [color=#ff0000]die[/color][color=#0000cc]([/color][color=#ff00ff]"Could not connect: "[/color] [color=#0000cc].[/color] [color=#ff0000]mysql_error[/color][color=#0000cc]([/color][color=#0000cc])[/color][color=#0000cc])[/color][color=#0000cc];[/color]
[color=#ff9900]// 获取当前页数
[/color]
if[color=#0000cc]([/color] [color=#ff0000]isset[/color][color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]_GET[/color][color=#0000cc][[/color][color=#ff00ff]'page'[/color][color=#0000cc]][/color][color=#0000cc])[/color] [color=#0000cc])[/color][color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]page[/color] [color=#0000cc]=[/color] [color=#ff0000]intval[/color][color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]_GET[/color][color=#0000cc][[/color][color=#ff00ff]'page'[/color][color=#0000cc]][/color] [color=#0000cc])[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
else[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]page[/color] [color=#0000cc]=[/color] 1[color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#ff9900]// 每页数量
[/color]
[color=#0000ff]$[/color][color=#008080]PageSize[/color] [color=#0000cc]=[/color] 10[color=#0000cc];[/color]
[color=#ff9900]// 获取总数据量
[/color]
[color=#0000ff]$[/color][color=#008080]sql[/color] [color=#0000cc]=[/color] [color=#ff00ff]"select count(*) as amount from table"[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]result[/color] [color=#0000cc]=[/color] [color=#ff0000]mysql_query[/color][color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]sql[/color][color=#0000cc])[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]row[/color] [color=#0000cc]=[/color] [color=#ff0000]mysql_fetch_row[/color][color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]result[/color][color=#0000cc])[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]amount[/color] [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]row[/color][color=#0000cc][[/color][color=#ff00ff]'amount'[/color][color=#0000cc]][/color][color=#0000cc];[/color]
[color=#ff9900]// 记算总共有多少页
[/color]
if[color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]amount[/color] [color=#0000cc])[/color][color=#0000cc]{[/color]
if[color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]amount[/color] ＜ [color=#0000ff]$[/color][color=#008080]page_size[/color] [color=#0000cc])[/color][color=#0000cc]{[/color] [color=#0000ff]$[/color][color=#008080]page_count[/color] [color=#0000cc]=[/color] 1[color=#0000cc];[/color] [color=#0000cc]}[/color] [color=#ff9900]//如果总数据量小于$PageSize，那么只有一页
[/color]
if[color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]amount[/color] [color=#0000cc]%[/color] [color=#0000ff]$[/color][color=#008080]page_size[/color] [color=#0000cc])[/color][color=#0000cc]{[/color] [color=#ff9900]//取总数据量除以每页数的余数
[/color]
[color=#0000ff]$[/color][color=#008080]page_count[/color] [color=#0000cc]=[/color] [color=#0000cc]([/color]int[color=#0000cc])[/color][color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]amount[/color] [color=#0000cc]/[/color] [color=#0000ff]$[/color][color=#008080]page_size[/color][color=#0000cc])[/color] [color=#0000cc]+[/color] 1[color=#0000cc];[/color] [color=#ff9900]//如果有余数，则页数等于总数据量除以每页数的结果取整再加一
[/color]
[color=#0000cc]}[/color][color=#0000ff]else[/color][color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]page_count[/color] [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]amount[/color] [color=#0000cc]/[/color] [color=#0000ff]$[/color][color=#008080]page_size[/color][color=#0000cc];[/color] [color=#ff9900]//如果没有余数，则页数等于总数据量除以每页数的结果
[/color]
[color=#0000cc]}[/color]
[color=#0000cc]}[/color]
else[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]page_count[/color] [color=#0000cc]=[/color] 0[color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#ff9900]// 翻页链接
[/color]
[color=#0000ff]$[/color][color=#008080]page_string[/color] [color=#0000cc]=[/color] [color=#ff00ff]''[/color][color=#0000cc];[/color]
if[color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]page[/color] [color=#0000cc]=[/color][color=#0000cc]=[/color] 1 [color=#0000cc])[/color][color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]page_string[/color] [color=#0000cc].[/color][color=#0000cc]=[/color] [color=#ff00ff]'第一页|上一页|'[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
else[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]page_string[/color] [color=#0000cc].[/color][color=#0000cc]=[/color] [color=#ff00ff]'＜a href=?page=1＞第一页＜/a＞|＜a href=?page='[/color][color=#0000cc].[/color][color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]page[/color][color=#0000cc]-[/color]1[color=#0000cc])[/color][color=#0000cc].[/color][color=#ff00ff]'＞上一页＜/a＞|'[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
if[color=#0000cc]([/color] [color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]page[/color] [color=#0000cc]=[/color][color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]page_count[/color][color=#0000cc])[/color] [color=#0000cc]|[/color][color=#0000cc]|[/color] [color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]page_count[/color] [color=#0000cc]=[/color][color=#0000cc]=[/color] 0[color=#0000cc])[/color] [color=#0000cc])[/color][color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]page_string[/color] [color=#0000cc].[/color][color=#0000cc]=[/color] [color=#ff00ff]'下一页|尾页'[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
else[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]page_string[/color] [color=#0000cc].[/color][color=#0000cc]=[/color] [color=#ff00ff]'＜a href=?page='[/color][color=#0000cc].[/color][color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]page[/color][color=#0000cc]+[/color]1[color=#0000cc])[/color][color=#0000cc].[/color][color=#ff00ff]'＞下一页＜/a＞|＜a href=?page='[/color][color=#0000cc].[/color][color=#0000ff]$[/color][color=#008080]page_count[/color][color=#0000cc].[/color][color=#ff00ff]'＞尾页＜/a＞'[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#ff9900]// 获取数据，以二维数组格式返回结果
[/color]
if[color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]amount[/color] [color=#0000cc])[/color][color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]sql[/color] [color=#0000cc]=[/color] [color=#ff00ff]"select * from table order by id desc limit "[/color][color=#0000cc].[/color] [color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]page[/color][color=#0000cc]-[/color]1[color=#0000cc])[/color][color=#0000cc]*[/color][color=#0000ff]$[/color][color=#008080]page_size[/color] [color=#0000cc].[/color][color=#ff00ff]", $page_size"[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]result[/color] [color=#0000cc]=[/color] [color=#ff0000]mysql_query[/color][color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]sql[/color][color=#0000cc])[/color][color=#0000cc];[/color]
while [color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]row[/color] [color=#0000cc]=[/color] [color=#ff0000]mysql_fetch_row[/color][color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]result[/color][color=#0000cc])[/color] [color=#0000cc])[/color][color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]rowset[/color][color=#0000cc][[/color][color=#0000cc]][/color] [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]row[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000cc]}[/color][color=#0000ff]else[/color][color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]rowset[/color] [color=#0000cc]=[/color] [color=#ff0000]array[/color][color=#0000cc]([/color][color=#0000cc])[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#ff9900]// 没有包含显示结果的代码，那不在讨论范围，只要用foreach就可以很简单的用得到的二维数组来显示结果
[/color]
[color=#0000cc]?[/color][color=#0000cc]>[/color] [/color]
4、OO风格代码
以下代码中的数据库连接是使用的pear db类进行处理
[color=#000000][color=#0000cc]<[/color][color=#0000cc]?[/color][color=#0000ff]php[/color]
[color=#ff9900]// FileName: Pager.class.php
[/color]
[color=#ff9900]// 分页类，这个类仅仅用于处理数据结构，不负责处理显示的工作
[/color]
Class Pager
[color=#0000cc]{[/color]
var [color=#0000ff]$[/color][color=#008080]PageSize[/color][color=#0000cc];[/color] [color=#ff9900]//每页的数量
[/color]
var [color=#0000ff]$[/color][color=#008080]CurrentPageID[/color][color=#0000cc];[/color] [color=#ff9900]//当前的页数
[/color]
var [color=#0000ff]$[/color][color=#008080]NextPageID[/color][color=#0000cc];[/color] [color=#ff9900]//下一页
[/color]
var [color=#0000ff]$[/color][color=#008080]PreviousPageID[/color][color=#0000cc];[/color] [color=#ff9900]//上一页
[/color]
var [color=#0000ff]$[/color][color=#008080]numPages[/color][color=#0000cc];[/color] [color=#ff9900]//总页数
[/color]
var [color=#0000ff]$[/color][color=#008080]numItems[/color][color=#0000cc];[/color] [color=#ff9900]//总记录数
[/color]
var [color=#0000ff]$[/color][color=#008080]isFirstPage[/color][color=#0000cc];[/color] [color=#ff9900]//是否第一页
[/color]
var [color=#0000ff]$[/color][color=#008080]isLastPage[/color][color=#0000cc];[/color] [color=#ff9900]//是否最后一页
[/color]
var [color=#0000ff]$[/color][color=#008080]sql[/color][color=#0000cc];[/color] [color=#ff9900]//sql查询语句
[/color]
function Pager[color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]option[/color][color=#0000cc])[/color]
[color=#0000cc]{[/color]
global [color=#0000ff]$[/color][color=#008080]db[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞_setOptions[color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]option[/color][color=#0000cc])[/color][color=#0000cc];[/color]
[color=#ff9900]// 总条数
[/color]
if [color=#0000cc]([/color] [color=#0000cc]![/color][color=#ff0000]isset[/color][color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numItems[color=#0000cc])[/color] [color=#0000cc])[/color]
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]res[/color] [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]db[/color][color=#0000cc]-[/color]＞query[color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞sql[color=#0000cc])[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numItems [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]res[/color][color=#0000cc]-[/color]＞numRows[color=#0000cc]([/color][color=#0000cc])[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#ff9900]// 总页数
[/color]
if [color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numItems ＞ 0 [color=#0000cc])[/color]
[color=#0000cc]{[/color]
if [color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numItems ＜ [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞PageSize [color=#0000cc])[/color][color=#0000cc]{[/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numPages [color=#0000cc]=[/color] 1[color=#0000cc];[/color] [color=#0000cc]}[/color]
if [color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numItems [color=#0000cc]%[/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞PageSize [color=#0000cc])[/color]
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numPages[color=#0000cc]=[/color] [color=#0000cc]([/color]int[color=#0000cc])[/color][color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numItems [color=#0000cc]/[/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞PageSize[color=#0000cc])[/color] [color=#0000cc]+[/color] 1[color=#0000cc];[/color]
[color=#0000cc]}[/color]
else
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numPages [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numItems [color=#0000cc]/[/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞PageSize[color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000cc]}[/color]
else
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numPages [color=#0000cc]=[/color] 0[color=#0000cc];[/color]
[color=#0000cc]}[/color]
switch [color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞CurrentPageID [color=#0000cc])[/color]
[color=#0000cc]{[/color]
case [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numPages [color=#0000cc]=[/color][color=#0000cc]=[/color] 1[color=#0000cc]:[/color]
[color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞isFirstPage [color=#0000cc]=[/color] [color=#0000ff]true[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞isLastPage [color=#0000cc]=[/color] [color=#0000ff]true[/color][color=#0000cc];[/color]
break[color=#0000cc];[/color]
case 1[color=#0000cc]:[/color]
[color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞isFirstPage [color=#0000cc]=[/color] [color=#0000ff]true[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞isLastPage [color=#0000cc]=[/color] [color=#0000ff]false[/color][color=#0000cc];[/color]
break[color=#0000cc];[/color]
case [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numPages[color=#0000cc]:[/color]
[color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞isFirstPage [color=#0000cc]=[/color] [color=#0000ff]false[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞isLastPage [color=#0000cc]=[/color] [color=#0000ff]true[/color][color=#0000cc];[/color]
break[color=#0000cc];[/color]
default[color=#0000cc]:[/color]
[color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞isFirstPage [color=#0000cc]=[/color] [color=#0000ff]false[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞isLastPage [color=#0000cc]=[/color] [color=#0000ff]false[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
if [color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numPages ＞ 1 [color=#0000cc])[/color]
[color=#0000cc]{[/color]
if [color=#0000cc]([/color] [color=#0000cc]![/color][color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞isLastPage [color=#0000cc])[/color] [color=#0000cc]{[/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞NextPageID [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞CurrentPageID [color=#0000cc]+[/color] 1[color=#0000cc];[/color] [color=#0000cc]}[/color]
if [color=#0000cc]([/color] [color=#0000cc]![/color][color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞isFirstPage [color=#0000cc])[/color] [color=#0000cc]{[/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞PreviousPageID [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞CurrentPageID [color=#0000cc]-[/color] 1[color=#0000cc];[/color] [color=#0000cc]}[/color]
[color=#0000cc]}[/color]
return [color=#0000ff]true[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#ff9900]/***
*
* 返回结果集的数据库连接
* 在结果集比较大的时候可以直接使用这个方法获得数据库连接，然后在类之外遍历，这样开销较小
* 如果结果集不是很大，可以直接使用getPageData的方式获取二维数组格式的结果
* getPageData方法也是调用本方法来获取结果的
*
***/[/color]
function getDataLink[color=#0000cc]([/color][color=#0000cc])[/color]
[color=#0000cc]{[/color]
if [color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numItems [color=#0000cc])[/color]
[color=#0000cc]{[/color]
global [color=#0000ff]$[/color][color=#008080]db[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]PageID[/color] [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞CurrentPageID[color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]from[/color] [color=#0000cc]=[/color] [color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]PageID[/color] [color=#0000cc]-[/color] 1[color=#0000cc])[/color][color=#0000cc]*[/color][color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞PageSize[color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]count[/color] [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞PageSize[color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]link[/color] [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]db[/color][color=#0000cc]-[/color]＞limitQuery[color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞sql[color=#0000cc],[/color] [color=#0000ff]$[/color][color=#008080]from[/color][color=#0000cc],[/color] [color=#0000ff]$[/color][color=#008080]count[/color][color=#0000cc])[/color][color=#0000cc];[/color] [color=#ff9900]//使用Pear DB::limitQuery方法保证数据库兼容性
[/color]
return [color=#0000ff]$[/color][color=#008080]link[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
else
[color=#0000cc]{[/color]
return [color=#0000ff]false[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000cc]}[/color]
[color=#ff9900]/***
*
* 以二维数组的格式返回结果集
*
***/[/color]
function getPageData[color=#0000cc]([/color][color=#0000cc])[/color]
[color=#0000cc]{[/color]
if [color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞numItems [color=#0000cc])[/color]
[color=#0000cc]{[/color]
if [color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]res[/color] [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞getDataLink[color=#0000cc]([/color][color=#0000cc])[/color] [color=#0000cc])[/color]
[color=#0000cc]{[/color]
if [color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]res[/color][color=#0000cc]-[/color]＞numRows[color=#0000cc]([/color][color=#0000cc])[/color] [color=#0000cc])[/color]
[color=#0000cc]{[/color]
while [color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]row[/color] [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]res[/color][color=#0000cc]-[/color]＞fetchRow[color=#0000cc]([/color][color=#0000cc])[/color] [color=#0000cc])[/color]
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]result[/color][color=#0000cc][[/color][color=#0000cc]][/color] [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]row[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000cc]}[/color]
else
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]result[/color] [color=#0000cc]=[/color] [color=#ff0000]array[/color][color=#0000cc]([/color][color=#0000cc])[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
return [color=#0000ff]$[/color][color=#008080]result[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
else
[color=#0000cc]{[/color]
return [color=#0000ff]false[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000cc]}[/color]
else
[color=#0000cc]{[/color]
return [color=#0000ff]false[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000cc]}[/color]
function _setOptions[color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]option[/color][color=#0000cc])[/color]
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]allow_options[/color] [color=#0000cc]=[/color] [color=#ff0000]array[/color][color=#0000cc]([/color]
[color=#ff00ff]'PageSize'[/color][color=#0000cc],[/color]
[color=#ff00ff]'CurrentPageID'[/color][color=#0000cc],[/color]
[color=#ff00ff]'sql'[/color][color=#0000cc],[/color]
[color=#ff00ff]'numItems'[/color]
[color=#0000cc])[/color][color=#0000cc];[/color]
foreach [color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]option[/color] [color=#0000ff]as[/color] [color=#0000ff]$[/color][color=#008080]key[/color] [color=#0000cc]=[/color]＞ [color=#0000ff]$[/color][color=#008080]value[/color] [color=#0000cc])[/color]
[color=#0000cc]{[/color]
if [color=#0000cc]([/color] [color=#ff0000]in_array[/color][color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]key[/color][color=#0000cc],[/color] [color=#0000ff]$[/color][color=#008080]allow_options[/color][color=#0000cc])[/color] [color=#0000cc]&[/color][color=#0000cc]&[/color] [color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]value[/color] [color=#0000cc]![/color][color=#0000cc]=[/color] [color=#0000ff]null[/color][color=#0000cc])[/color] [color=#0000cc])[/color]
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞[color=#0000ff]$[/color][color=#008080]key[/color] [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]value[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000cc]}[/color]
return [color=#0000ff]true[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000cc]}[/color]
[color=#0000cc]?[/color][color=#0000cc]>[/color]
[color=#0000cc]<[/color][color=#0000cc]?[/color][color=#0000ff]php[/color]
[color=#ff9900]// FileName: test_pager.php
[/color]
[color=#ff9900]// 这是一段简单的示例代码，前边省略了使用pear db类建立数据库连接的代码
[/color]
[color=#0000ff]require[/color] [color=#ff00ff]"Pager.class.php"[/color][color=#0000cc];[/color]
[color=#0000ff]if[/color] [color=#0000cc]([/color] [color=#ff0000]isset[/color][color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]_GET[/color][color=#0000cc][[/color][color=#ff00ff]'page'[/color][color=#0000cc]][/color][color=#0000cc])[/color] [color=#0000cc])[/color]
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]page[/color] [color=#0000cc]=[/color] [color=#0000cc]([/color]int[color=#0000cc])[/color][color=#0000ff]$[/color][color=#008080]_GET[/color][color=#0000cc][[/color][color=#ff00ff]'page'[/color][color=#0000cc]][/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000ff]else[/color]
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]page[/color] [color=#0000cc]=[/color] 1[color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000ff]$[/color][color=#008080]sql[/color] [color=#0000cc]=[/color] [color=#ff00ff]"select * from table order by id"[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]pager_option[/color] [color=#0000cc]=[/color] [color=#ff0000]array[/color][color=#0000cc]([/color]
[color=#ff00ff]"sql"[/color] [color=#0000cc]=[/color]＞ [color=#0000ff]$[/color][color=#008080]sql[/color][color=#0000cc],[/color]
[color=#ff00ff]"PageSize"[/color] [color=#0000cc]=[/color]＞ 10[color=#0000cc],[/color]
[color=#ff00ff]"CurrentPageID"[/color] [color=#0000cc]=[/color]＞ [color=#0000ff]$[/color][color=#008080]page[/color]
[color=#0000cc])[/color][color=#0000cc];[/color]
[color=#0000ff]if[/color] [color=#0000cc]([/color] [color=#ff0000]isset[/color][color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]_GET[/color][color=#0000cc][[/color][color=#ff00ff]'numItems'[/color][color=#0000cc]][/color][color=#0000cc])[/color] [color=#0000cc])[/color]
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]pager_option[/color][color=#0000cc][[/color][color=#ff00ff]'numItems'[/color][color=#0000cc]][/color] [color=#0000cc]=[/color] [color=#0000cc]([/color]int[color=#0000cc])[/color][color=#0000ff]$[/color][color=#008080]_GET[/color][color=#0000cc][[/color][color=#ff00ff]'numItems'[/color][color=#0000cc]][/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000ff]$[/color][color=#008080]pager[/color] [color=#0000cc]=[/color] [color=#0000cc]@[/color][color=#0000ff]new[/color] Pager[color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]pager_option[/color][color=#0000cc])[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]data[/color] [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]pager[/color][color=#0000cc]-[/color]＞getPageData[color=#0000cc]([/color][color=#0000cc])[/color][color=#0000cc];[/color]
[color=#0000ff]if[/color] [color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]pager[/color][color=#0000cc]-[/color]＞isFirstPage [color=#0000cc])[/color]
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]turnover[/color] [color=#0000cc]=[/color] [color=#ff00ff]"首页|上一页|"[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000ff]else[/color]
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]turnover[/color] [color=#0000cc]=[/color] [color=#ff00ff]"＜a href='?page=1&numItems="[/color][color=#0000cc].[/color][color=#0000ff]$[/color][color=#008080]pager[/color][color=#0000cc]-[/color]＞numItems[color=#0000cc].[/color][color=#ff00ff]"'＞首页＜/a＞|＜a href='?page="[/color][color=#0000cc].[/color][color=#0000ff]$[/color][color=#008080]pager[/color][color=#0000cc]-[/color]＞ PreviousPageID[color=#0000cc].[/color][color=#ff00ff]"&numItems="[/color][color=#0000cc].[/color][color=#0000ff]$[/color][color=#008080]pager[/color][color=#0000cc]-[/color]＞ numItems[color=#0000cc].[/color][color=#ff00ff]"'＞上一页＜/a＞|"[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000ff]if[/color] [color=#0000cc]([/color] [color=#0000ff]$[/color][color=#008080]pager[/color][color=#0000cc]-[/color]＞isLastPage [color=#0000cc])[/color]
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]turnover[/color] [color=#0000cc].[/color][color=#0000cc]=[/color] [color=#ff00ff]"下一页|尾页"[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000ff]else[/color]
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]turnover[/color] [color=#0000cc].[/color][color=#0000cc]=[/color] [color=#ff00ff]"＜a href='?page="[/color][color=#0000cc].[/color][color=#0000ff]$[/color][color=#008080]pager[/color][color=#0000cc]-[/color]＞NextPageID[color=#0000cc].[/color][color=#ff00ff]"&numItems="[/color][color=#0000cc].[/color][color=#0000ff]$[/color][color=#008080]pager[/color][color=#0000cc]-[/color]＞numItems[color=#0000cc].[/color][color=#ff00ff]"'＞下一页＜/a＞|＜a href='?page="[/color][color=#0000cc].[/color][color=#0000ff]$[/color][color=#008080]pager[/color][color=#0000cc]-[/color]＞numPages[color=#0000cc].[/color][color=#ff00ff]"&numItems="[/color][color=#0000cc].[/color][color=#0000ff]$[/color][color=#008080]pager[/color][color=#0000cc]-[/color]＞numItems[color=#0000cc].[/color][color=#ff00ff]"'＞尾页＜/a＞"[/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000cc]?[/color][color=#0000cc]>[/color] [/color]
需要说明的地方有两个：
这个类仅仅处理数据，并不负责处理显示，因为我觉得将数据的处理和结果的显示都放到一个类里边实在是有些勉强。显示的时候情况和要求多变，不如自己根据类给出的结果处理，更好的方法是根据这个Pager类继承一个自己的子类来显示不同的分页，比如显示用户分页列表可以：
[color=#000000][color=#0000cc]<[/color][color=#0000cc]?[/color][color=#0000ff]php[/color]
[color=#0000ff]Class[/color] MemberPager [color=#0000ff]extends[/color] Pager
[color=#0000cc]{[/color]
function showMemberList[color=#0000cc]([/color][color=#0000cc])[/color]
[color=#0000cc]{[/color]
global [color=#0000ff]$[/color][color=#008080]db[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]data[/color] [color=#0000cc]=[/color] [color=#0000ff]$[/color][color=#008080]this[/color][color=#0000cc]-[/color]＞getPageData[color=#0000cc]([/color][color=#0000cc])[/color][color=#0000cc];[/color]
[color=#ff9900]// 显示结果的代码
[/color]
[color=#ff9900]// ......
[/color]
[color=#0000cc]}[/color]
[color=#0000cc]}[/color]
[color=#ff9900]/// 调用
[/color]
[color=#0000ff]if[/color] [color=#0000cc]([/color] [color=#ff0000]isset[/color][color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]_GET[/color][color=#0000cc][[/color][color=#ff00ff]'page'[/color][color=#0000cc]][/color][color=#0000cc])[/color] [color=#0000cc])[/color]
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]page[/color] [color=#0000cc]=[/color] [color=#0000cc]([/color]int[color=#0000cc])[/color][color=#0000ff]$[/color][color=#008080]_GET[/color][color=#0000cc][[/color][color=#ff00ff]'page'[/color][color=#0000cc]][/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000ff]else[/color]
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]page[/color] [color=#0000cc]=[/color] 1[color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000ff]$[/color][color=#008080]sql[/color] [color=#0000cc]=[/color] [color=#ff00ff]"select * from members order by id"[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]pager_option[/color] [color=#0000cc]=[/color] [color=#ff0000]array[/color][color=#0000cc]([/color]
[color=#ff00ff]"sql"[/color] [color=#0000cc]=[/color]＞ [color=#0000ff]$[/color][color=#008080]sql[/color][color=#0000cc],[/color]
[color=#ff00ff]"PageSize"[/color] [color=#0000cc]=[/color]＞ 10[color=#0000cc],[/color]
[color=#ff00ff]"CurrentPageID"[/color] [color=#0000cc]=[/color]＞ [color=#0000ff]$[/color][color=#008080]page[/color]
[color=#0000cc])[/color][color=#0000cc];[/color]
[color=#0000ff]if[/color] [color=#0000cc]([/color] [color=#ff0000]isset[/color][color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]_GET[/color][color=#0000cc][[/color][color=#ff00ff]'numItems'[/color][color=#0000cc]][/color][color=#0000cc])[/color] [color=#0000cc])[/color]
[color=#0000cc]{[/color]
[color=#0000ff]$[/color][color=#008080]pager_option[/color][color=#0000cc][[/color][color=#ff00ff]'numItems'[/color][color=#0000cc]][/color] [color=#0000cc]=[/color] [color=#0000cc]([/color]int[color=#0000cc])[/color][color=#0000ff]$[/color][color=#008080]_GET[/color][color=#0000cc][[/color][color=#ff00ff]'numItems'[/color][color=#0000cc]][/color][color=#0000cc];[/color]
[color=#0000cc]}[/color]
[color=#0000ff]$[/color][color=#008080]pager[/color] [color=#0000cc]=[/color] [color=#0000cc]@[/color][color=#0000ff]new[/color] MemberPager[color=#0000cc]([/color][color=#0000ff]$[/color][color=#008080]pager_option[/color][color=#0000cc])[/color][color=#0000cc];[/color]
[color=#0000ff]$[/color][color=#008080]pager[/color][color=#0000cc]-[/color]＞showMemberList[color=#0000cc]([/color][color=#0000cc])[/color][color=#0000cc];[/color]
[color=#0000cc]?[/color][color=#0000cc]>[/color] [/color]
第二个需要说明的地方就是不同数据库的兼容性，在不同的数据库里截获一段结果的写法是不一样的。
mysql: select * from table limit offset, rows
pgsql: select * from table limit m offset n
......
所以要在类里边获取结果的时候需要使用pear db类的limitQuery方法。