php +mysql 分页,php+mysql分页类

class PageSupport{

//属性

var $sql; //所要显示数据的SQL查询语句

var $page_size; //每页显示最多行数

var $start_index; //所要显示记录的首行序号

var $total_records; //记录总数

var $current_records; //本页读取的记录数

var $result; //读出的结果

var $total_pages; //总页数

var $current_page; //当前页数

var $display_count = 30; //显示的前几页和后几页数

var $arr_page_query; //数组，包含分页显示需要传递的参数

var $first;

var $prev;

var $next;

var $last;

//方法

function PageSupport($ppage_size)

{

$this->page_size=$ppage_size;

$this->start_index=0;

}

function __destruct()

{

}

function __get($property_name)

{

if(isset($this->$property_name))

{

return($this->$property_name);

}

else

{

return(NULL);

}

}

function __set($property_name, $value)

{

$this->$property_name = $value;

}

function read_data()

{

$psql=$this->sql;

//查询数据，数据库链接等信息应在类调用的外部实现

$result=mysql_query($psql) or die(mysql_error());

$this->total_records=mysql_num_rows($result);

//利用LIMIT关键字获取本页所要显示的记录

if($this->total_records>0)

{

$this->start_index = ($this->current_page-1)*$this->page_size;

$psql=$psql. " LIMIT ".$this->start_index." , ".$this->page_size;

$result=mysql_query($psql) or die(mysql_error());

$this->current_records=mysql_num_rows($result);

//将查询结果放在result数组中

$i=0;

while($row=mysql_fetch_Array($result))

{

$this->result[$i]=$row;

$i++;

}

}

//获取总页数、当前页信息

$this->total_pages=ceil($this->total_records/$this->page_size);

$this->first=1;

$this->prev=$this->current_page-1;

$this->next=$this->current_page+1;

$this->last=$this->total_pages;

}

function standard_navigate()

{

echo "";

echo "";

echo "";

}

function full_navigate()

{

echo "";

echo "";

echo "";

}

}

?>