我正在试图弄清楚是否有可能查询这样的事情（因为我无法使其工作）
$query = $em->createQuery("SELECT l FROM Bundle\EngMgmtBundle\Entity\Project p,
Bundle\EngMgmtBundle\Entity\Line l,
Bundle\EngMgmtBundle\Entity\Site s
WHERE p.leader = :usr AND p.sites = s.id AND s.line = l.id");
$query->setParameter('usr', $this->get('security.context')->getToken()->getUser());
我明白了：
[Semantical Error] line 0, col 289 near 'sites = s.id': Error: Invalid PathExpression. StateFieldPathExpression or SingleValuedAssociationField expected.
意思是我不能直接在project.sites上查询，就像我正在做的那样......我怎么能把它转过来让它起作用？
信息：
我有这些实体：Project，Line，Site，我需要查询与记录用户负责的项目（或项目）相关的所有行（领导者）。我之前没有使用ManyToMany关系之前就已经进行了这类查询。
项目有许多站点，许多站点属于许多项目，站点有一条线，一条线有很多站点。
这是每个实体的基本结构：
项目：
class Project
{
/**
* @var integer
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @var string
*
* @ORM\Column(name="name", type="string", length=255)
*/
private $name;
/**
* @ORM\ManyToOne(targetEntity="Bundle\UserBundle\Entity\User")
* @ORM\JoinColumn(name="leader_id", referencedColumnName="id",nullable=false)
*/
private $leader;
/**
* @ORM\ManyToOne(targetEntity="Bundle\ClientBundle\Entity\Client")
* @ORM\JoinColumn(name="client_id", referencedColumnName="id",nullable=false)
*/
private $client;
/**
* @ORM\ManyToMany(targetEntity="Bundle\EngMgmtBundle\Entity\Site")
* @ORM\JoinTable(name="Project_Sites",
* joinColumns={@ORM\JoinColumn(name="site_id", referencedColumnName="id")},
* inverseJoinColumns={@ORM\JoinColumn(name="project_id", referencedColumnName="id")}
* )
*/
private $sites;
public function __construct()
{
$this->sites = new ArrayCollection();
}
/**
* Get id
*
* @return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set name
*
* @param string $name
* @return Project
*/
public function setName($name)
{
$this->name = $name;
return $this;
}
/**
* Get name
*
* @return string
*/
public function getName()
{
return $this->name;
}
/**
* Set leader
*
* @param string $leader
* @return Project
*/
public function setLeader(\Bundle\UserBundle\Entity\User $leader)
{
$this->leader = $leader;
return $this;
}
/**
* Get leader
*
* @return string
*/
public function getLeader()
{
return $this->leader;
}
/**
* Set client
*
* @param string $client
* @return Project
*/
public function setClient(\Bundle\ClientBundle\Entity\Client $client)
{
$this->client = $client;
return $this;
}
/**
* Get client
*
* @return string
*/
public function getClient()
{
return $this->client;
}
/**
* Get Sites
*
* @return array
*/
public function getSites()
{
return $this->sites;
}
/* Returns Project's Name */
public function __toString()
{
return $this->name;
}
}
网站：
class Site
{
/**
* @var integer
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @ORM\ManyToOne(targetEntity="Bundle\EngMgmtBundle\Entity\Line")
* @ORM\JoinColumn(name="line_id", referencedColumnName="id",nullable=false)
*/
private $line;
/**
* @var string
*
* @ORM\Column(name="latitude", type="string", length=255)
*/
private $latitude;
/**
* @var string
*
* @ORM\Column(name="longitude", type="string", length=255)
*/
private $longitude;
/**
* @var string
*
* @ORM\Column(name="internal_id", type="string", length=255, nullable=true)
*/
private $internalId;
/**
* @var string
*
* @ORM\Column(name="name", type="string", length=255)
*/
private $name;
/**
* @ORM\ManyToOne(targetEntity="Bundle\EngMgmtBundle\Entity\Priority")
* @ORM\JoinColumn(name="priority_id", referencedColumnName="id",nullable=false)
*/
private $priority;
/**
* @ORM\ManyToOne(targetEntity="Bundle\EngMgmtBundle\Entity\Location")
* @ORM\JoinColumn(name="location_id", referencedColumnName="id",nullable=false)
*/
private $state;
/**
* Get id
*
* @return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set line
*
* @param string $line
* @return Site
*/
public function setLine(\Bundle\EngMgmtBundle\Entity\Line $line)
{
$this->line = $line;
return $this;
}
/**
* Get line
*
* @return string
*/
public function getLine()
{
return $this->line;
}
/**
* Set latitude
*
* @param string $latitude
* @return Site
*/
public function setLatitude($latitude)
{
$this->latitude = $latitude;
return $this;
}
/**
* Get latitude
*
* @return string
*/
public function getLatitude()
{
return $this->latitude;
}
/**
* Set longitude
*
* @param string $longitude
* @return Site
*/
public function setLongitude($longitude)
{
$this->longitude = $longitude;
return $this;
}
/**
* Get longitude
*
* @return string
*/
public function getLongitude()
{
return $this->longitude;
}
/**
* Set internalId
*
* @param string $internalId
* @return Site
*/
public function setInternalId($internalId)
{
$this->internalId = $internalId;
return $this;
}
/**
* Get internalId
*
* @return string
*/
public function getInternalId()
{
return $this->internalId;
}
/**
* Set name
*
* @param string $name
* @return Site
*/
public function setName($name)
{
$this->name = $name;
return $this;
}
/**
* Get name
*
* @return string
*/
public function getName()
{
return $this->name;
}
/**
* Set priority
*
* @param string $priority
* @return Site
*/
public function setPriority(\Bundle\EngMgmtBundle\Entity\Priority $priority)
{
$this->priority = $priority;
return $this;
}
/**
* Get priority
*
* @return string
*/
public function getPriority()
{
return $this->priority;
}
/**
* Set state
*
* @param string $state
* @return Site
*/
public function setState(\Bundle\EngMgmtBundle\Entity\Location $state)
{
$this->state = $state;
return $this;
}
/**
* Get state
*
* @return string
*/
public function getState()
{
return $this->state;
}
/* Returns Site's Name */
public function __toString()
{
return $this->name;
}
行：
class Line
{
/**
* @var integer
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="AUTO")
*/
private $id;
/**
* @var string
*
* @ORM\Column(name="name", type="string", length=255)
*/
private $name;
/**
* @ORM\OneToOne(targetEntity="Bundle\UserBundle\Entity\User")
* @ORM\JoinColumn(name="supervisor_id", referencedColumnName="id",nullable=false)
*/
private $supervisor;
/**
* Get id
*
* @return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set name
*
* @param string $name
* @return Line
*/
public function setName($name)
{
$this->name = $name;
return $this;
}
/**
* Get name
*
* @return string
*/
public function getName()
{
return $this->name;
}
/**
* Set supervisor
*
* @param string $supervisor
* @return Line
*/
public function setSupervisor(\Bundle\UserBundle\Entity\User $supervisor)
{
$this->supervisor = $supervisor;
return $this;
}
/**
* Get supervisor
*
* @return string
*/
public function getSupervisor()
{
return $this->supervisor;
}
/* Returns Line's Name */
public function __toString()
{
return $this->name;
}
我真的很感激你能提供给我的任何帮助。提前致谢。
答案 0 :(得分：1)
你的代码在哪里？从获取安全上下文的方式来看，我猜它可能在控制器中？也许这个查询应该放在Project实体的存储库方法中？我想使用查询生成器是最简单的方法来做这样的事情。我无法对此进行测试，因此它可能无法通过复制和粘贴来工作，但希望它无论如何都会变得模糊：
$em->createQueryBuilder('p')
->select('p', 's', 'l')
->leftJoin('p.sites', 's')
->leftJoin('s.line', 'l')
->where('p.leader = :user')
->setParameter('user', $user)
->getQuery()
->getResult();