TP3.2框架分页相关实现方法分析

<?php
namespace Home\Controller;
use Think\Controller;
class BaseController extends Controller {
    /**
     * 基础分页的相同代码封装,使前台的代码更少
     * @param $count 要分页的总记录数
     * @param int $pagesize 每页查询条数
     * @return \Think\Page
    */
    function getpage($count, $pagesize = 20,$waps) {
          $Page = new \Think\Page($count,$pagesize,$waps);
     $Page->rollPage = 5;
     $Page->setConfig('header', '<li class="rows">第<b>%NOW_PAGE%</b>页/共<b>%TOTAL_PAGE%</b>页</li>');
       $Page->setConfig('prev', '上一页');
       $Page->setConfig('next', '下一页');
     $Page->setConfig('last', '末页');
         $Page->setConfig('first', '首页');
         $Page->setConfig('theme', '%FIRST%%UP_PAGE%%LINK_PAGE%%DOWN_PAGE%%END%%HEADER%');
         $Page->lastSuffix = false;//最后一页不显示为总页数
         return $Page;
    }
    /**
     * @param $model     模型
     * @param $map         where条件
     * @param $find      0 select 1=find 2=关联表
     * @return $list     数组
    */
    function _select($model,$map,$order='',$field="",$find="0",$limit=20,$join,$param){
        $waps = $param;
        if(empty($model) && empty($map)){
            $this->list = array();
        }else{
            if($find == 0){
                $count = $model->where($map)->count();
                $Page = $this->getpage($count,$limit,$waps);
                if($Page->firstRow < 0){
                    $Page->firstRow = 0;
                }
                if($order != ""){
                    $this->list = $model->field($field)->where($map)->order($order)->limit($Page->firstRow. ',' . $Page->listRows)->select();
                }else{
                    $this->list = $model->field($field)->where($map)->limit($Page->firstRow. ',' . $Page->listRows)->select();    
                }
                $this->page = $Page->show();
            }else if($find == 1){
                $this->list = $model->field($field)->where($map)->find();
            }else if($find == 3){
                $count = $model->alias("t1")->join($join)->where($map)->count(); 
                $Page = $this->getpage($count,$limit,$waps);
                if($Page->firstRow < 0){
                    $Page->firstRow = 0;
                }
                if($order != ""){
                    $this->list = $model->alias("t1")->join($join)->field($field)->where($map)->order($order)->limit($Page->firstRow. ',' . $Page->listRows)->select();
                }else{
                    $this->list = $model->alias("t1")->join($join)->field($field)->where($map)->limit($Page->firstRow. ',' . $Page->listRows)->select();    
                }
                $this->page = $Page->show();
            }else if($find == 4){
                if($order != ""){
                    $this->list = $model->alias("t1")->join($join)->field($field)->where($map)->order($order)->limit($Page->firstRow. ',' . $Page->listRows)->find();
                }else{
                    $this->list = $model->alias("t1")->join($join)->field($field)->where($map)->limit($Page->firstRow. ',' . $Page->listRows)->find();    
                }
            }
            $this->limit = $Page->firstRow;
            $this->assign("listinfo",$this->list);
            $this->assign("page",$this->page);
            return($this->list);
        }
    }
}