使用createNativeQuery加入沒有外鍵的兩個實體

Question

我想根據一個字段（類型）的值從兩個不同的表中檢索數據。基本上，如果類型是2或3，涉及 'subcategory_id' 到CATEGORY2或類別3分別

的滑動SQL：

SELECT s.id, s.subcategory_id, s.type, IF(s.type = 2, c2.name, c3.name) as name 
            FROM show_subcategory s 
            LEFT JOIN category2 c2 ON (s.type = 2 AND s.subcategory_id = c2.id) 
            LEFT JOIN category3 c3 ON (s.type = 3 AND s.subcategory_id = c3.id) 
            WHERE s.category1_id = 1 ORDER BY s.order_list 

到DQL到存儲庫類翻譯：

$em = $this->getEntityManager(); 
    $rsm = new ResultSetMapping; 
    $rsm->addEntityResult('Acme\CoreBundle\Entity\ShowSubcategory', 's'); 
    $rsm->addFieldResult('s', 'id', 'id'); 
    $rsm->addFieldResult('s', 'subcategory_id', 'subcategoryId'); 
    $rsm->addFieldResult('s', 'type', 'type'); 
    $rsm->addFieldResult('s', 'order_list', 'orderList'); 

    $rsm->addJoinedEntityResult('Acme\CoreBundle\Entity\Category2' , 'c2', 's', 'category2'); 
    $rsm->addFieldResult('c2', 'id', 'id'); 
    $rsm->addFieldResult('c2', 'name', 'name'); 

    $rsm->addJoinedEntityResult('Acme\CoreBundle\Entity\Category3' , 'c3', 's', 'category3'); 
    $rsm->addFieldResult('c3', 'id', 'id'); 
    $rsm->addFieldResult('c3', 'name', 'name'); 

    $q = $em->createNativeQuery("SELECT s.id, s.subcategory_id, s.type, IF(s.type = 2, c2.name, c3.name) as name 
            FROM show_subcategory s 
            LEFT JOIN category2 c2 ON (s.type = 2 AND s.subcategory_id = c2.id) 
            LEFT JOIN category3 c3 ON (s.type = 3 AND s.subcategory_id = c3.id) 
            WHERE s.category1_id = ? ORDER BY s.order_list", $rsm); 
    $q->setParameter(1, $category1); 

    return $q->getResult(); 

在實體對於ShowSubcategory，我添加了兩個新屬性來處理此查詢（category2，category3）：

/** 
* @var integer $id 
* 
* @ORM\Column(name="id", type="integer", nullable=false) 
* @ORM\Id 
* @ORM\GeneratedValue(strategy="AUTO") 
*/ 
protected $id; 

/** 
* @var integer $subcategoryId 
* 
* @ORM\Column(name="subcategory_id", type="integer", nullable=false) 
*/ 
protected $subcategoryId; 

/** 
* @var smallint $type 
* 
* @ORM\Column(name="type", type="smallint", nullable=false) 
*/ 
protected $type; 

/** 
* @var smallint $orderList 
* 
* @ORM\Column(name="order_list", type="smallint", nullable=true) 
*/ 
protected $orderList; 

/** 
* @var \Category1 
* 
* @ORM\ManyToOne(targetEntity="Acme\CoreBundle\Entity\Category1") 
* @ORM\JoinColumns({ 
* @ORM\JoinColumn(name="category1_id", referencedColumnName="id") 
* }) 
*/ 
protected $category1; 

/** 
* @var category2 
* 
* @ORM\ManyToOne(targetEntity="Acme\CoreBundle\Entity\Category2") 
* @ORM\JoinColumns({ 
* @ORM\JoinColumn(name="subcategory_id", referencedColumnName="id") 
* }) 
* @Assert\Blank() 
*/ 
protected $category2; 

/** 
* @var category3 
* 
* @ORM\ManyToOne(targetEntity="Acme\CoreBundle\Entity\Category3") 
* @ORM\JoinColumns({ 
* @ORM\JoinColumn(name="subcategory_id", referencedColumnName="id") 
* }) 
* @Assert\Blank() 
*/ 
protected $category3; 


/** 
* Get id 
* 
* @return integer 
*/ 
public function getId() 
{ 
    return $this->id; 
} 


/** 
* Set category1 
* 
* @param \Acme\CoreBundle\Entity\Category1 $category1 
* @return ShowSubcategory 
*/ 
public function setCategory1(\Acme\CoreBundle\Entity\Category1 $category1 = null) 
{ 
    $this->category1 = $category1; 

    return $this; 
} 

/** 
* Get category1 
* 
* @return Acme\CoreBundle\Entity\Category1 
*/ 
public function getCategory1() 
{ 
    return $this->category1; 
} 

/** 
* Set subcategoryId 
* 
* @param integer $subcategoryId 
* @return ShowSubcategory 
*/ 
public function setSubcategoryId($subcategoryId) 
{ 
    $this->subcategoryId = $subcategoryId; 

    return $this; 
} 

/** 
* Get subcategoryId 
* 
* @return integer 
*/ 
public function getSubcategoryId() 
{ 
    return $this->subcategoryId; 
} 

/** 
* Set type 
* 
* @param smallint $type 
* @return ShowSubcategory 
*/ 
public function setType($type) 
{ 
    $this->type = $type; 

    return $this; 
} 

/** 
* Get type 
* 
* @return smallint 
*/ 
public function getType() 
{ 
    return $this->type; 
} 

/** 
* Set order 
* 
* @param smallint $OrderList 
* @return ShowSubcategory 
*/ 
public function setOrderList($orderList) 
{ 
    $this->orderList = $orderList; 

    return $this; 
} 

/** 
* Get OrderList 
* 
* @return smallint 
*/ 
public function getOrderList() 
{ 
    return $this->orderList; 
} 

public function getCategory2() 
{ 
    return $this->category2; 
} 

public function setCategory2(Category2 $category2 = null) 
{ 
    $this->category2 = $category2; 
    return $this; 
} 

public function getCategory3() 
{ 
    return $this->category3; 
} 

public function setCategory3(Category3 $category3 = null) 
{ 
    $this->category3 = $category3; 
    return $this; 
} 

}

我得到這個錯誤：

Notice: Undefined index: id in /var/www/project/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php line 2402 

我不知道什麼是錯的我曾嘗試一些想法，但似乎沒有任何工作。任何建議？ 在此先感謝。

Answer 1

我想你必須在SELECT子句中明確地添加id：

SELECT s.id, s.subcategory_id, s.type, IF(s.type = 2, c2.name, c3.name) as name, c2.id as c2id, c3.id as c3id 
    FROM show_subcategory s 
    LEFT JOIN category2 c2 ON (s.type = 2 AND s.subcategory_id = c2.id) 
    LEFT JOIN category3 c3 ON (s.type = 3 AND s.subcategory_id = c3.id) 
    WHERE s.category1_id = ? ORDER BY s.order_list 

和適應的結果集如下：

$rsm = new ResultSetMapping; 
$rsm->addEntityResult('Acme\CoreBundle\Entity\ShowSubcategory', 's'); 
$rsm->addFieldResult('s', 'id', 'id'); 
$rsm->addFieldResult('s', 'subcategory_id', 'subcategoryId'); 
$rsm->addFieldResult('s', 'type', 'type'); 
$rsm->addFieldResult('s', 'order_list', 'orderList'); 

$rsm->addJoinedEntityResult('Acme\CoreBundle\Entity\Category2' , 'c2', 's', 'category2'); 
$rsm->addFieldResult('c2', 'c2id', 'id'); 
$rsm->addFieldResult('c2', 'name', 'name'); 

$rsm->addJoinedEntityResult('Acme\CoreBundle\Entity\Category3' , 'c3', 's', 'category3'); 
$rsm->addFieldResult('c3', 'c3id', 'id'); 
$rsm->addFieldResult('c3', 'name', 'name');