如何正确初始化通过实体的懒惰收集？

Question

我需要通过使用实体自行初始化集合。我的意思是，我可以在Java中做到这一点，例如： 我会从StatelesBean类中调用方法。

那么，我怎么能在PHP的方式呢？如果有人可以写样本代码，我将不胜感激。

@Transient 
public void initialize(Collection collection, int levelCursor, int level) 
{ 
    if (collection instanceof PersistentBag) 
    { 
     if (ObjectUtil.isNull(((PersistentBag)collection).getSession())) 
      return; 
     else 
     { 
      Iterator itr = ((Collection)collection).iterator(); 
      while (itr.hasNext()) 
      { 
       if (levelCursor < level) 
        ((SuperEntity)itr.next()).initialize(levelCursor, level); 
       else 
        itr.next(); 
      } 
     } 
    } else 
    { 
     Iterator itr = ((Collection)collection).iterator(); 
     while (itr.hasNext()) 
     { 
      if (levelCursor < level) 
       ((SuperEntity)itr.next()).initialize(levelCursor, level); 
      else 
       itr.next(); 
     } 
    } 
} 

/** 
* Searches for column and join column annotations for getter methods. 
* If found then tries to initialize childs 
* @param levelCursor 
* @param level 
*/ 
@Transient 
public void initialize(int levelCursor, int level) 
{ 
    levelCursor++; 

    Method[] methods = this.getClass().getMethods(); 

    Object obj = null; 

    try 
    { 
     for (Method method : methods) 
     { 
      if (method.getAnnotation(JoinColumn.class) != null || method.getAnnotation(JoinTable.class) != null || method.getAnnotation(OneToMany.class) != null) 
      { 
       Object result = method.invoke(this, new Object[0]); 
       if (result == null) 
        continue; 

       if (result instanceof SuperEntity) 
       { 
        if (levelCursor < level) 
         ((SuperEntity)result).initialize(levelCursor, level); 
       } else if (result instanceof Collection) 
        initialize((Collection)result, levelCursor, level); 
      } 
     } 
    } 
    catch (Exception exc) 
    { 
     exc.printStackTrace(); 
    } 
} 

Answer 1

所以，据我了解你的任务，你想初始化你的实体集合的对象，当你检索它们？

当你要求它的时候，主义加载你的收藏automagicaly。

所以，你可以用一个getter做到这一点：

class User 
    { 

     /** 
     * OneToMany(targetEntity="Car", mappedBy="owner") 
     */ 
     private $ownedCars; 

     public function __construct() 
     { 
      $this->ownedCars = new ArrayCollection(); 
     } 

     public function getOwnedCars($level) 
     { 
      // autoload collection 
      foreach($this->ownedCars as $ownedCar) 
      { 
       $ownedCar->initialize($level); 
      } 

      return $this->ownedCars; 
     } 
    }