Analysis on ThinkPHP's use of getlist method to implement data search function

<form action="" method="get">
    <table class="account_table" width="100%" cellpadding="0" cellspacing="0">
      <tr>
        <td style="text-align:right">订单号：</td>
        <td>
          <input id="Orderid" name="order_sn" class="inp_wid3" type="text" value="{$_GET[&#39;order_sn&#39;]}"/>
        </td>
        <td style="text-align:right">
          下单日期：
        </td>
        <td colspan="5">
          <input type="text" class="inp_wid2" id="BeginTime" name="begintime" value="{$_GET[&#39;begintime&#39;]}" />
          至
          <input type="text" class="inp_wid2" id="EndTime" name="endtime" value="{$_GET[&#39;endtime&#39;]}" />
           交易完成日期
          <input type="text" class="inp_wid2" id="txtFinishedBeginTime" name="finishbegintime" value="{$_GET[&#39;finishbegintime&#39;]}" />
          至
          <input type="text" class="inp_wid2" id="txtFinishedEndTime" name="finishendtime" value="{$_GET[&#39;finishendtime&#39;]}" />
           订单金额：
          <input type="text" class="inp_wid2" id="txtMoneyMin" name="count_price_min" value="{$_GET[&#39;count_price_min&#39;]}"/>
          至
          <input type="text" class="inp_wid2" id="txtMoneyMax" name="count_price_max" value="{$_GET[&#39;count_price_max&#39;]}" />
        </td>
      </tr>
      <tr>
        <td style="text-align:right; width:80px">采购商名称：</td>
        <td style="width:140px">
          <input id="SupermarketName" name="user_nick_name" class="inp_wid3" type="text" value="{$_GET[&#39;user_nick_name&#39;]}" />
        </td>
        <td style="text-align:right; width:80px">采购商账号：</td>
        <td style="width:140px">
          <input id="SupermarketZh" name="user_name" class="inp_wid3" type="text" value="{$_GET[&#39;user_name&#39;]}" />
        </td>
      </tr>
      <tr>
        <td colspan="2">
          <input class="search_btn1" type="submit" value="搜索" id="Search" />
          </td>
      </tr>
    </table>
</form>

$order_msg=$order->getList();
$this->assign('info',$order_msg);//这个获取订单的详细信息

public function getList($pagesize=25){
     $tableName = $this->getTableName();
   $where = $tableName.'.service_id = '.$_SESSION['service_site']['service_id'];
   if(!empty($_GET['order_sn'])){//查询订单号
       $where.= " and $tableName.`order_sn` like '%".$_GET['order_sn']."%'";
     }
   if(!empty($_GET['count_price_min'])){//查询订单最小金额
       $where.= " and $tableName.count_price >=".$_GET['count_price_min']."";
     }
   if(!empty($_GET['begintime'])){//下单开始日期搜索
    $_GET['begintime']=strtotime($_GET['begintime']);//将日期转为时间戳
    $where.= " and $tableName.add_time >=".$_GET['begintime']."";
    $_GET['begintime']=date('Y-m-d',$_GET['begintime']);//将日期转为时间戳
   }
   if(!empty($_GET['endtime'])){//下单结束日期搜索
     $_GET['endtime']=strtotime($_GET['endtime']);//将日期转为时间戳
    $where.= " and $tableName.add_time <=".$_GET[&#39;endtime&#39;]."";
    $_GET[&#39;endtime&#39;]=date(&#39;Y-m-d&#39;,$_GET[&#39;endtime&#39;]);//将时间戳转换成日期，方便刷新页面后前台显示
   }
   if(!empty($_GET[&#39;finishbegintime&#39;])){//交易完成开始日期搜索
    $_GET[&#39;finishbegintime&#39;]=strtotime($_GET[&#39;finishbegintime&#39;]);//将日期转为时间戳
    $where.= " and $tableName.ok_time >=".$_GET[&#39;finishbegintime&#39;]."";
    $_GET[&#39;finishbegintime&#39;]=date(&#39;Y-m-d&#39;,$_GET[&#39;finishbegintime&#39;]);//将日期转为时间戳
   }
   if(!empty($_GET[&#39;finishendtime&#39;])){//交易完成结束日期搜索
     $_GET[&#39;finishendtime&#39;]=strtotime($_GET[&#39;finishendtime&#39;]);//将日期转为时间戳
    $where.= " and $tableName.ok_time <=".$_GET[&#39;finishendtime&#39;]."";
    $_GET[&#39;finishendtime&#39;]=date(&#39;Y-m-d&#39;,$_GET[&#39;finishendtime&#39;]);//将时间戳转换成日期，方便刷新页面后前台显示
   }
   if(!empty($_GET[&#39;send&#39;])){//查询已发货预警订单,发货时间距离此刻超过五天
    $where.= " and $tableName.send_time < &#39;".(time()-60*60*24*5)."&#39;";
   }
   if(!empty($_GET[&#39;doingorder&#39;])){//查询处理中的订单
    $where.= " and $tableName.status in (0,1)";
   }
   if(!empty($_GET[&#39;warningorder&#39;])){//查询预警的订单：已经付款且时间超过24小时未发货
    $where.= " and $tableName.pay_time < &#39;".(time()-60*60*24)."&#39;";
   }
   if(!empty($_GET[&#39;warningorder&#39;])){//查询预警的订单：已经付款且时间超过24小时未发货
    $where.= " and $tableName.is_pay = 1 ";
   }
   if(!empty($_GET[&#39;warningorder&#39;])){//查询预警的订单：已经付款且时间超过24小时未发货
   $where.= " and $tableName.status in (0,1)";
   }
   if(!empty($_GET[&#39;count_price_max&#39;])){//查询订单最大金额
    $where.= " and $tableName.count_price <=".$_GET[&#39;count_price_max&#39;]."";
   }
   if(!empty($_GET[&#39;user_nick_name&#39;])){//查询采购商名称
    $where.= " and fab_user.nick_name like &#39;".$_GET[&#39;user_nick_name&#39;]."%&#39;";
   }
   if(!empty($_GET[&#39;user_name&#39;])){//查询采购商账号
    $where.= " and fab_user.user_name like &#39;".$_GET[&#39;user_name&#39;]."%&#39;";
   }
   if(!empty($_GET[&#39;supplier_nick_name&#39;])){//查询供应商商名称
    $where.= " and fab_supplier.nick_name like &#39;".$_GET[&#39;supplier_nick_name&#39;]."%&#39;";
   }
   if(!empty($_GET[&#39;supplier_name&#39;])){//查询供应商账号
    $where.= " and fab_supplier.supplier_name like &#39;".$_GET[&#39;supplier_name&#39;]."%&#39;";
   }
   if($_GET[&#39;history&#39;] == 1){
     $where .= " and {$tableName}.status in (2,3,4) ";
   }
   if(($_GET[&#39;pay_type&#39;])!=""&&($_GET[&#39;pay_type&#39;])!=-1){//查询支付方式
    $where.= " and fab_order_info.pay_type = ".$_GET[&#39;pay_type&#39;]."";
   }
   if(($_GET[&#39;status&#39;])!=""&&($_GET[&#39;status&#39;])!=-1){//查询订单状态
    $where.= " and fab_order_info.status = ".$_GET[&#39;status&#39;]."";
   }
     if(!empty($_GET[&#39;stime&#39;]) && !empty($_GET[&#39;etime&#39;])){
       $stime = strtotime($_GET[&#39;stime&#39;]);
       $etime = strtotime($_GET[&#39;etime&#39;]) + 24*60*60;
       $where.= " and ($tableName.`inputtime` between &#39;$stime&#39; and &#39;$etime&#39;)";
     }
     $count = $this->where($where)->count();
     $this->countNum = $count;
     $Page = new \Think\Page($count,$pagesize);
     $this->page = $Page->show();
     $limit = $Page->firstRow.&#39;,&#39;.$Page->listRows;
    $sql="select $tableName.*,fab_supplier.nick_name as supplier_nick_name,fab_user.nick_name as user_nick_name
    from ($tableName left join fab_supplier on fab_order_info.supplier_id=fab_supplier.supplier_id)
    left join fab_user on fab_order_info.user_id=fab_user.user_id where $where order by $tableName.`order_id` desc limit $limit";
    $sqls="select sum(fab_order_info.count_price) as order_price,count(fab_order_info.count_price) as order_count
    from $tableName where $where order by $tableName.`order_id` desc limit $limit";
    $this->sql_msg=$this->query($sqls);
    return $this->query($sql);//订单详细信息
}