php中分页原与与分页类

// 建立数据库连接
$link = mysql_connect(“localhost”, “mysql_user”, “mysql_passWord”)
or die(“Could not connect: ” . mysql_error());
// 获取当前页数
if( isset($_GET['page']) ){
$page = intval( $_GET['page'] );
}
else{
$page = 1;
}
// 每页数量
$PageSize = 10;
// 获取总数据量
$sql = “select count(*) as amount from table”;
$result = mysql_query($sql);
$row = mysql_fetch_row($result);
$amount = $row['amount'];
// 记算总共有多少页
if( $amount ){
if( $amount if( $amount % $page_size ){ //取总数据量除以每页数的余数
$page_count = (int)($amount / $page_size) + 1; //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
}else{
$page_count = $amount / $page_size; //如果没有余数，则页数等于总数据量除以每页数的结果
}
}
else{
$page_count = 0;
}
// 翻页链接
$page_string = ”;
if( $page == 1 ){
$page_string .= ‘第一页|上一页|’;
}
else{
$page_string .= ‘第一页|上一页|’;
}
if( ($page == $page_count) || ($page_count == 0) ){
$page_string .= ‘下一页|尾页’;
}
else{
$page_string .= ‘下一页|尾页’;
}
// 获取数据，以二维数组格式返回结果
if( $amount ){
$sql = “select * from table order by id desc limit “. ($page-1)*$page_size .”, $page_size”;
$result = mysql_query($sql);

while ( $row = mysql_fetch_row($result) ){
$rowset[] = $row;
}
}else{
$rowset = array();
}
// 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
?>

class PageView{
/**页码**/
public $pageNo = 1;
/**页大小**/
public $pageSize = 20;
/**共多少页**/
public $pageCount = 0;
/**总记录数**/
public $totalNum = 0;
/**偏移量,当前页起始行**/
public $offSet = 0;
/**每页数据**/
public $pageData = array();

/**是否有上一页**/
public $hasPrePage = true;
/**是否有下一页**/
public $hasNextPage = true;

public $pageNoList = array();

public $jsFunction ='jsFunction';
/**
*
* @param unknown_type $count 总行数
* @param unknown_type $size 分页大小
* @param unknown_type $string
*/
public function __construct($count=0, $size=20,$pageNo=1,$pageData =array(),$jsFunction='jsFunction'){

$this->totalNum = $count;//总记录数
$this->pageSize = $size;//每页大小
$this->pageNo = $pageNo;
//计算总页数
$this->pageCount = ceil($this->totalNum/$this->pageSize);
$this->pageCount = ($this->pageCountpageCount;
//检查pageNo
$this->pageNo = $this->pageNo == 0 ? 1 : $this->pageNo;
$this->pageNo = $this->pageNo > $this->pageCount? $this->pageCount : $this->pageNo;

//计算偏移
$this->offset = ( $this->pageNo - 1 ) * $this->pageSize;
//计算是否有上一页下一页
$this->hasPrePage = $this->pageNo == 1 ?false:true;

$this->hasNextPage = $this->pageNo >= $this->pageCount ?false:true;

$this->pageData = $pageData;
$this->jsFunction = $jsFunction;

}
/**
* 分页算法
* @return
*/
private function generatePageList(){
$pageList = array();
if($this->pageCount for($i=0;$ipageCount;$i++){
array_push($pageList,$i+1);
}
}else{
if($this->pageNo for($i=0;$i array_push($pageList,$i+1);
}
array_push($pageList,-1);
array_push($pageList,$this->pageCount);

}else if($this->pageNo > $this->pageCount - 4){
array_push($pageList,1);

array_push($pageList,-1);
for($i=5;$i>0;$i--){
array_push($pageList,$this->pageCount - $i+1);
}
}else if($this->pageNo > 4 && $this->pageNo pageCount - 4){
array_push($pageList,1);
array_push($pageList,-1);

array_push($pageList,$this->pageNo -2);
array_push($pageList,$this->pageNo -1);
array_push($pageList,$this->pageNo);
array_push($pageList,$this->pageNo + 1);
array_push($pageList,$this->pageNo + 2);

array_push($pageList,-1);
array_push($pageList,$this->pageCount);

}
}
return $pageList;
}

/***
* 创建分页控件
* @param
* @return String
*/
public function echoPageAsDiv(){
$pageList = $this->generatePageList();

$pageString ="

?>

-->

$pageNo = $_GET['pageNo'];
if(empty($pageNo)){
}
//分页数据
$pageData = News::getNewsPage($pageNo,$pageSize);
//取得总行数
$count = News::getNewsCount();
//创建分页器
$p = new PageView($count['0']['TOTAL'],$pageSize,$pageNo,$pageData);
　　　　 //生成页码
$pageViewString = $p->echoPageAsDiv();