1

假设我有一个记录类，它经常使用 MySQL 聚合值的动态列进行查询：

$results = Doctrine_Core::getTable('MyRecord')->creatQuery('m')
  ->select('m.*, AVG(m.rating) as avg_rating, SUM(m.id) as nb_related') 
  ->innerJoin('m.AnotherRecords a')
  ->where('m.id = ?')
  ->fetchOne();

现在假设我想要该记录上的一个方法来检查从查询记录时起聚合列是否存在，如果不存在，那么我想继续发出一个单独的查询来获取这些值：

// this doesnt actually work because of filterSet and filterGet
// but its general idea
public function getAverageRating($wtihNbRelated = false)
{
  if(!isset($this->avg_rating) || ($withNbRelated && !isset($this->nb_related))
  {
     $rating = $this->getTable()->getAverageRating($this, $withNbRelated);
     $this->avg_rating = $rating['avg_rating'];

     if($withNbRealted)
     {
       $this->nb_related = $rating['nb_related'];
     }
  }

  return $withNbRelated
    ? array('avg_rating' => $this->avg_rating, 'nb_related' => $this->nb_related)
    : array('avg_rating' => $this->avg_rating);
}

有没有简单的方法（即不编写自定义水合器）来做到这一点？

4

1 回答 1

0

真的很简单的答案。我忘记了 Doctrine 的所有直接受保护成员的前缀都是_. 因此，即使我最初尝试操纵data成员，但我忘记了前缀给我的结果与我尝试过的结果$this->avg_rating或其访问器方法相同。解决方案是：

public function getAverageRating($wtihNbRelated = false)
{
  if(!isset($this->_data['avg_rating']) || ($withNbRelated && !isset($this->_data['nb_related']))
  {
     $rating = $this->getTable()->getAverageRating($this, $withNbRelated);
     $this->_data['avg_rating'] = $rating['avg_rating'];

     if($withNbRealted)
     {
       $this->_data['nb_related'] = $rating['nb_related'];
     }
  }

  return $withNbRelated
    ? array('avg_rating' => $this->_data['avg_rating'], 'nb_related' => $this->_data['nb_related'])
    : array('avg_rating' => $this->_data['avg_rating']);
}
于 2011-05-31T01:31:59.410 回答