使用createNativeQuery连接没有外键的两个实体 [英] Using createNativeQuery to join two entities without foreign key
问题描述
我想根据一个字段(类型)的值从两个不同的表中检索数据。基本上,如果类型是2或3,将'subcategory_id'分别与category2或category3相关联
I want to retrieve data from two different tables depending of the value of one field (type). Basically if type is 2 or 3, relate 'subcategory_id' to category2 or category3 respectively
纯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
将DQL转换为Repository类: p>
The translation to DQL into Repository Class:
$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ShowSubcategory的实体中,我添加了两个新的属性来处理此查询(category2,category3):
In the entity for ShowSubcategory I added two new properties to handle with this query(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;
}
}
我收到这个错误:
Notice: Undefined index: id in /var/www/project/vendor/doctrine/orm/lib/Doctrine/ORM/UnitOfWork.php line 2402
我不知道我试过了什么问题几个想法,但没有什么似乎工作。任何建议?
提前感谢
I don't know what is wrong I have tried several ideas, but nothing seems to work. Any suggestion?. Thanks in advance.
推荐答案
我想你必须明确地添加 id
在SELECT子句中:
I guess you have to explicitely add id
in the SELECT clause :
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
然后调整ResultSet如下:
And adapt the ResultSet as following :
$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');
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