YII 操作数据库的三种方式

作者：袖梨 2022-06-25

Getting data from a database
Most applications today use databases. Be it a small website or a social network, at least some parts are powered by databases. Yii introduces three ways which allow you to work with databases:
Active Record
Query builder
SQL via DAO

 代码如下 复制代码
class DbController extends Controller
{
    protected function afterAction($action)
    {
        $time = sprintf('%0.5f', Yii::getLogger()->getExecutionTime());
        $memory = round(memory_get_peak_usage()/(1024*1024),2)."MB";
        echo "Time: $time, memory: $memory";
        parent::afterAction($action);
    }
 
    public function actionAr()
    {
        $actors = Actor::model()->findAll(array('with' => 'films',
                'order' => 't.first_name, t.last_name, films.title'));
        echo '
    ';
            foreach($actors as $actor)
            {
                echo '
  1. ';
                echo $actor->first_name.' '.$actor->last_name;
                echo '
      ';
                  foreach($actor->films as $film)
                  {
                      echo '
    1. ';
                      echo $film->title;
                      echo '
      2. ';
                  }
                  echo '
    ';
                echo '
    2. ';
            }
            echo '
';
    }
 
    public function actionQueryBuilder()
    {
        $rows = Yii::app()->db->createCommand()
                ->from('actor')
                ->join('film_actor', 'actor.actor_id=film_actor.actor_id')
                ->leftJoin('film', 'film.film_id=film_actor.film_id')
                ->order('actor.first_name, actor.last_name, film.title')
                ->queryAll();
        $this->renderRows($rows);
    }
 
    public function actionSql()
    {
        $sql = "SELECT * FROM actor a
             JOIN film_actor fa ON fa.actor_id = a.actor_id
             JOIN film f ON fa.film_id = f.film_id
             ORDER BY a.first_name, a.last_name, f.title";
        $rows = Yii::app()->db->createCommand($sql)->queryAll();
        $this->renderRows($rows);
    }
 
    public function renderRows($rows)
    {
        $lastActorName = null;
        echo '
    ';
            foreach($rows as $row)
            {
                $actorName = $row['first_name'].' '.$row['last_name'];
                if($actorName!=$lastActorName){
                    if($lastActorName!==null){
                        echo '
';
                    echo '';
                }
                $lastActorName = $actorName;
                echo '
  • ';
                    echo $actorName;
                    echo '
      ';
                  }
                  echo '
    1. ';
                  echo $row['title'];
                  echo '
      2. ';
              }
              echo '
    ';
        }
    }
    		•

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