Doctrine 如何使用条令从多对多关系表中检索数据

假设我有3个表：

Book

、

Author

和

BookAuthor

• Book

  有

  id

  ，

  name

• 作者

  拥有

  id

  ，

  姓名

• BookAuthor

  拥有

  id

  ，

  book

  \u id，

  author

  \u id

---

我想找到一位作者的所有书籍，我知道

author\u id

。谁能告诉我如何使用

条令查询语言
？
我认为有几种方法：

1

在行动中：

 $this->books= Doctrine::getTable('BookAuthor')->getBookAuthor($author_id);

 $this->books= Doctrine::getTable('Book')->getBookAuthor($author_id);

在模型中：

  public function getBookAuthor($author_id)
        {
            $q = $this->createQuery('a')
                       ->Where('a.author_id=?',$author_id)
                       ->addORDERBY ('created_at DESC');

        return $q->execute();
        }

 public function getBookAuthor($author_id)
        {
            $q = $this->createQuery('a')
                       ->andWhere('a.active=1')
                       ->leftJoin('a.BookAuthor o')
                       ->andWhere('o.author_id=?',$author_id)
                       ->addORDERBY ('created_at DESC');


    return $q->execute();
    }

2

例如，有时您在book表中有一些参数，例如book可以是活动的，也可以不是活动的

在行动中：

 $this->books= Doctrine::getTable('BookAuthor')->getBookAuthor($author_id);

 $this->books= Doctrine::getTable('Book')->getBookAuthor($author_id);

在模型中：

  public function getBookAuthor($author_id)
        {
            $q = $this->createQuery('a')
                       ->Where('a.author_id=?',$author_id)
                       ->addORDERBY ('created_at DESC');

        return $q->execute();
        }

 public function getBookAuthor($author_id)
        {
            $q = $this->createQuery('a')
                       ->andWhere('a.active=1')
                       ->leftJoin('a.BookAuthor o')
                       ->andWhere('o.author_id=?',$author_id)
                       ->addORDERBY ('created_at DESC');


    return $q->execute();
    }

我认为有几种方法：

1

在行动中：

 $this->books= Doctrine::getTable('BookAuthor')->getBookAuthor($author_id);

 $this->books= Doctrine::getTable('Book')->getBookAuthor($author_id);

在模型中：

  public function getBookAuthor($author_id)
        {
            $q = $this->createQuery('a')
                       ->Where('a.author_id=?',$author_id)
                       ->addORDERBY ('created_at DESC');

        return $q->execute();
        }

 public function getBookAuthor($author_id)
        {
            $q = $this->createQuery('a')
                       ->andWhere('a.active=1')
                       ->leftJoin('a.BookAuthor o')
                       ->andWhere('o.author_id=?',$author_id)
                       ->addORDERBY ('created_at DESC');


    return $q->execute();
    }

2

例如，有时您在book表中有一些参数，例如book可以是活动的，也可以不是活动的

在行动中：

 $this->books= Doctrine::getTable('BookAuthor')->getBookAuthor($author_id);

 $this->books= Doctrine::getTable('Book')->getBookAuthor($author_id);

在模型中：

  public function getBookAuthor($author_id)
        {
            $q = $this->createQuery('a')
                       ->Where('a.author_id=?',$author_id)
                       ->addORDERBY ('created_at DESC');

        return $q->execute();
        }

 public function getBookAuthor($author_id)
        {
            $q = $this->createQuery('a')
                       ->andWhere('a.active=1')
                       ->leftJoin('a.BookAuthor o')
                       ->andWhere('o.author_id=?',$author_id)
                       ->addORDERBY ('created_at DESC');


    return $q->execute();
    }