一、如何分页
总记录行数 count，
每页显示 per，
分页的总页数 total_page = ceil(count/per)，向上取整
获得具体每页信息：limit 偏移量，条数
limit (page-1)*per, per
二、一个分页类，yii组件component 文件名与类名在形式上要统一
compontents/Pagination.php
<?php
/**
* 分页类，以组件形式存在
*/
class Pagination {
private $total; //数据表中总记录数
private $listRows; //每页显示行数
private $limit;
private $uri;
private $pageNum; //页数
private $config=array('header'=>"个记录", "prev"=>"上一页", "next"=>"下一页", "first"=>"首 页", "last"=>"尾 页");
private $listNum=8;
/*
* $total
* $listRows
*/
public function __construct($total, $listRows=10, $pa=""){
$this->total=$total;
$this->listRows=$listRows;
$this->uri=$this->getUri($pa);
$this->page=!empty($_GET["page"]) ? $_GET["page"] : 1;
$this->pageNum=ceil($this->total/$this->listRows);
$this->limit=$this->setLimit();
}
private function setLimit(){
return "Limit ".($this->page-1)*$this->listRows.", {$this->listRows}";
}
private function getUri($pa){
$url=$_SERVER["REQUEST_URI"].(strpos($_SERVER["REQUEST_URI"], '?')?'':"?").$pa;
$parse=parse_url($url);
if(isset($parse["query"])){
parse_str($parse['query'],$params);
unset($params["page"]);
$url=$parse['path'].'?'.http_build_query($params);
}
return $url;
}
function __get($args){
if($args=="limit")
return $this->limit;
else
return null;
}
private function start(){
if($this->total==0)
return 0;
else
return ($this->page-1)*$this->listRows+1;
}
private function end(){
return min($this->page*$this->listRows,$this->total);
}
private function first(){
if($this->page==1)
$html.='';
else
$html.=" <a href='{$this->uri}&page=1'>{$this->config["first"]}</a> ";
return $html;
}
private function prev(){
if($this->page==1)
$html.='';
else
$html.=" <a href='{$this->uri}&page=".($this->page-1)."'>{$this->config["prev"]}</a> ";
return $html;
}
private function pageList(){
$linkPage="";
$inum=floor($this->listNum/2);
for($i=$inum; $i>=1; $i--){
$page=$this->page-$i;
if($page<1)
continue;
$linkPage.=" <a href='{$this->uri}&page={$page}'>{$page}</a> ";
}
$linkPage.=" {$this->page} ";
for($i=1; $i<=$inum; $i++){
$page=$this->page+$i;
if($page<=$this->pageNum)
$linkPage.=" <a href='{$this->uri}&page={$page}'>{$page}</a> ";
else
break;
}
return $linkPage;
}
private function next(){
if($this->page==$this->pageNum)
$html.='';
else
$html.=" <a href='{$this->uri}&page=".($this->page+1)."'>{$this->config["next"]}</a> ";
return $html;
}
private function last(){
if($this->page==$this->pageNum)
$html.='';
else
$html.=" <a href='{$this->uri}&page=".($this->pageNum)."'>{$this->config["last"]}</a> ";
return $html;
}
private function goPage(){
return ' <input type="text" onkeydown="javascript:if(event.keyCode==13){var page=(this.value>'.$this->pageNum.')?'.$this->pageNum.':this.value;location=\''.$this->uri.'&page=\'+page+\'\'}" value="'.$this->page.'" style="width:25px"><input type="button" value="GO" page=(this.previousSibling.value>'.$this->pageNum.')?'.$this->pageNum.':this.previousSibling.value;location=\''.$this->uri.'&page=\'+page+\'\'"> ';
}
function fpage($display=array(0,1,2,3,4,5,6,7,8)){
$html[0]=" 共有<b>{$this->total}</b>{$this->config["header"]} ";
$html[1]=" 每页显示<b>".($this->end()-$this->start()+1)."</b>条，本页<b>{$this->start()}-{$this->end()}</b>条 ";
$html[2]=" <b>{$this->page}/{$this->pageNum}</b>页 ";
$html[3]=$this->first();
$html[4]=$this->prev();
$html[5]=$this->pageList();
$html[6]=$this->next();
$html[7]=$this->last();
$html[8]=$this->goPage();
$fpage='';
foreach($display as $index){
$fpage.=$html[$index];
}
return $fpage;
}
}三、分页实现
1. 获得总记录数
2. 实例化分页对象
3. 拼装分页sql
4. 获得页码列表
/*
* 建立一个测试方法，实现商品数据分页显示
*/
function actionShow1(){
//获得数据模型
$goods_model = Goods::model();
//1.获得商品总的记录数目
$cnt = $goods_model -> count();
$per = 6;
//2. 实例化分页类对象
$page = new Pagination($cnt, $per);
//3. 重新按照分页的样式拼装sql语句进行查询
$sql = "select * from `goods` $page->limit";
$goods_infos = $goods_model -> findAllBySql($sql);
//4. 获得分页页面列表(需要传递到视图模板里边显示)
$page_list = $page->fpage(array(3,4,5,6,7));
//调用视图模板，给模板传递数据
$this ->renderPartial('show',array('goods_infos'=>$goods_infos,'page_list'=>$page_list));
}在 视图中
echo $page_list
输出分页代码
