详解Yii实现分页的两种方法

Yii实现分页的两种方法,一种是用DAO实现,另外一种是在widget实现.

各有优点吧,第一种效率会高一点, 第二种可以使用自带的表格,方便一些.

一. DAO实现分页.

 [Controller层]

public function actionReport()
  {
    $sql = "select remitdate, sum(rate) sumrate from td_delivery 
      group by remitdate 
      order by remitdate desc";
    $criteria=new CDbCriteria();
    $result = Yii::app()->db->createCommand($sql)->query();
    $pages=new CPagination($result->rowCount);
    $pages->pageSize=2; 
    $pages->applyLimit($criteria); 
    $result=Yii::app()->db->createCommand($sql." LIMIT :offset,:limit"); 
    $result->bindValue(':offset', $pages->currentPage*$pages->pageSize); 
    $result->bindValue(':limit', $pages->pageSize); 
    $posts=$result->query();
    $this->render('report',array( 
        'posts'=>$posts, 
        'pages'=>$pages, 
    ));
  }

 [View层]

<?php foreach($posts as $row):?> 
 <?php echo CHtml::link($row["remitdate"],array('delivery/view','remitdate'=>$row["sumrate"]));?> 
 <?php echo $row["sumrate"]."<br />" ?>
 <?php endforeach;?>
 <?php 
 //分页widget代码: 
 $this->widget('CLinkPager',array('pages'=>$pages));
 ?>

优点: DAO效率高; 缺点: view层需要自己写一些样式,稍显麻烦一点

二. widget实现分页

[model层]

/**
   * @var string attribute : 日运费 (统计用)
   * 需要对新增加的字段做个声明
   */
  public $dayrate;


  /*
   * 统计功能: 统计每日的运费
   */
  public function statistics()
  {
    $criteria = new CDbCriteria;
    $criteria->select = 'remitdate, sum(rate) AS dayrate';
    $criteria->group = 'remitdate';
    
    return new CActiveDataProvider(get_class($this), array(
      'criteria'=>$criteria,
      'sort'=>array(
        // 表头设置点击排序的字段
        'attributes'=>array(
          'remitdate',
          'dayrate'=>array(
            'asc'=>'dayrate',
            'desc'=>'dayrate DESC',
          )
        ),
        'defaultOrder'=>'remitdate desc',
      ),
    ));  
  }

[Controller层]

/**
   * 运单统计功能:
   * 按日期统计
   */
  public function actionReport()
  {
    $model=new Delivery('statistics');
    $model->unsetAttributes(); // clear any default values
     
    $this->render('report',array(
      'model'=>$model,
    ));
  }

 [View层]

<?php $this->widget('zii.widgets.grid.CGridView', array(
  'id'=>'delivery-grid',
  'dataProvider'=>$model->statistics(),
  'filter'=>$model,
  'columns'=>array(
    'remitdate',
    'dayrate',
    array(
      'class'=>'CButtonColumn',
    ),
  ),
)); ?>

优点: 可以使用自带的样式; 缺点: 效率略低.