本文实例讲述了PHP实现的简单分页类及用法。分享给大家供大家参考,具体如下:
<?php
/*
* 使用:
* $page = new Page(连接符,查询语句,当前页码,每页大小,页码符)
* 连接符:一个MYSQL连接标识符,如果该参数留空,则使用最近一个连接
* 查询语句:SQL语句
* 当前页码:指定当前是第几页
* 每页大小:每页显示的记录数
* 页码符:指定当前页面URL格式
*
* 使用例子:
* $sql = "select * from aa";
* $page = new Page($conn,$sql,$_GET['page'],4,"?page=");
*
* 获得当前页码
* $page->page;
*
* 获得总页数
* $page->pageCount;
*
* 获得总记录数
* $page->rowCount;
*
* 获得本页记录数
* $page->listSize;
*
* 获得记录集
* $page->list;
* 记录集是一个2维数组,例:list[0]['id']访问第一条记录的id字段值.
*
* 获得页码列表
* $page->getPageList();
*/
class Page
{
//基础数据
var $sql;
var $page;
var $pageSize;
var $pageStr;
//统计数据
var $pageCount; //页数
var $rowCount; //记录数
//结果数据
var $list = array(); //结果行数组
var $listSize ;
//构造函数
function Page($conn,$sql_in,$page_in,$pageSize_in,$pageStr_in)
{
$this->sql = $sql_in;
$this->page = intval($page_in);
$this->pageSize = $pageSize_in;
$this->pageStr = $pageStr_in;
//页码为空或小于1的处理
if(!$this->page||$this->page<1)
{
$this->page = 1;
}
//查询总记录数
$rowCountSql = preg_replace("/([\w\W]*?select)([\w\W]*?)(from[\w\W]*?)/i","$1 count(0) $3",$this->sql);
if(!$conn)
$rs = mysql_query($rowCountSql) or die("bnc.page: error on getting rowCount.");
else
$rs = mysql_query($rowCountSql,$conn) or die("bnc.page: error on getting rowCount.");
$rowCountRow = mysql_fetch_row($rs);
$this->rowCount=$rowCountRow[0];
//计算总页数
if($this->rowCount%$this->pageSize==0)
$this->pageCount = intval($this->rowCount/$this->pageSize);
else
$this->pageCount = intval($this->rowCount/$this->pageSize)+1;
//SQL偏移量
$offset = ($this->page-1)*$this->pageSize;
if(!$conn)
$rs = mysql_query($this->sql." limit $offset,".$this->pageSize) or die("bnc.page: error on listing.");
else
$rs = mysql_query($this->sql." limit $offset,".$this->pageSize,$conn) or die("bnc.page: error on listing.");
while($row=mysql_fetch_array($rs))
{
$this->list[]=$row;
}
$this->listSize = count($this->list);
}
/*
* getPageList方法生成一个较简单的页码列表
* 如果需要定制页码列表,可以修改这里的代码,或者使用总页数/总记录数等信息进行计算生成.
*/
function getPageList()
{
$firstPage;
$previousPage;
$pageList;
$nextPage;
$lastPage;
$currentPage;
//如果页码>1则显示首页连接
if($this->page>1)
{
$firstPage = "<a href=\"".$this->pageStr."1\">首页</a>";
}
//如果页码>1则显示上一页连接
if($this->page>1)
{
$previousPage = "<a href=\"".$this->pageStr.($this->page-1)."\">上一页</a>";
}
//如果没到尾页则显示下一页连接
if($this->page<$this->pageCount)
{
$nextPage = "<a href=\"".$this->pageStr.($this->page+1)."\">下一页</a>";
}
//如果没到尾页则显示尾页连接
if($this->page<$this->pageCount)
{
$lastPage = "<a href=\"".$this->pageStr.$this->pageCount."\">尾页</a>";
}
//所有页码列表
for($counter=1;$counter<=$this->pageCount;$counter++)
{
if($this->page == $counter)
{
$currentPage = "<b>".$counter."</b>";
}
else
{
$currentPage = " "."<a href=\"".$this->pageStr.$counter."\">".$counter."</a>"." ";
}
$pageList .= $currentPage;
}
return $firstPage." ".$previousPage." ".$pageList." ".$nextPage." ".$lastPage." ";
}
}
?>
用法示例:
<?php
@$db = mysql_connect('localhost', 'root', '123456') or
die("Could not connect to database.");//连接数据库
mysql_query("set names 'utf8'");//输出中文
mysql_select_db('test'); //选择数据库
$sql = "select * from `users`"; //一个简单的查询
$page = new Page('',$sql,$_GET['page'],5,"?page=");
$rows = $page->list;
foreach($rows as $row)
{
echo $row['UserName']."<br>";
}
echo $page->getPageList(); //输出分页列表
?>
希望本文所述对大家PHP程序设计有所帮助。
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