php中分页原与与分页类_PHP教程

// 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 ="

?>

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$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();