Symfony 2 教义左连接

Posted 2023-04-12

【中文标题】Symfony 2 教义左连接

【英文标题】：Symfony 2 doctrine left join

【发布时间】：2014-12-21 15:49:06

【问题描述】：

我有疑问

    $em = $this->getDoctrine()->getManager();
    $query = $em->createQueryBuilder();

    $query = $em->createQueryBuilder()
        ->select('com', 'cit')
        ->from('CatalogWebBundle:ComCompany', 'com')
        ->leftJoin('com.cmpCity', 'cit')
        ->getQuery()
        ->setMaxResults(1);

    $info = $query->getResult();

工作正常，但我不知道如何从 JOINED TABLE 中获取结果。我尝试使用 JOINED 表 ENTITIES 中的 get 方法，但它不起作用？

也许我需要向 ENTITIES 做广告？

class ComCity

    /**
     * @var integer
     *
     * @ORM\Column(name="cit_id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    private $citId;

    /**
     * @var string
     *
     * @ORM\Column(name="cit_name", type="string", length=255, nullable=true)
     */
    private $citName;



    /**
     * Get citId
     *
     * @return integer 
     */
    public function getCitId()
    
        return $this->citId;
    

    /**
     * Set citName
     *
     * @param string $citName
     * @return ComCity
     */
    public function setCitName($citName)
    
        $this->citName = $citName;

        return $this;
    

    /**
     * Get citName
     *
     * @return string 
     */
    public function getCitName()
    
        return $this->citName;
    

命名空间目录\WebBundle\Entity;

使用 Doctrine\ORM\Mapping 作为 ORM；

class ComCompany

    /**
     * @var integer
     *
     * @ORM\Column(name="cmp_id", type="integer")
     * @ORM\Id
     * @ORM\GeneratedValue(strategy="IDENTITY")
     */
    private $cmpId;

    /**
     * @var string
     *
     * @ORM\Column(name="cmp_name", type="string", length=255, nullable=true)
     */
    private $cmpName;

    /**
     * @var integer
     *
     * @ORM\Column(name="cmp_code", type="bigint", nullable=true)
     */
    private $cmpCode;

    /**
     * @var string
     *
     * @ORM\Column(name="cmp_vat", type="string", length=255, nullable=true)
     */
    private $cmpVat;

    /**
     * @var integer
     *
     * @ORM\Column(name="cmp_emp", type="integer", nullable=true)
     */
    private $cmpEmp;

    /**
     * @var string
     *
     * @ORM\Column(name="cmp_return", type="string", length=255, nullable=true)
     */
    private $cmpReturn;

    /**
     * @var string
     *
     * @ORM\Column(name="cmp_return_from", type="string", length=255, nullable=true)
     */
    private $cmpReturnFrom;

    /**
     * @var string
     *
     * @ORM\Column(name="cmp_return_till", type="string", length=255, nullable=true)
     */
    private $cmpReturnTill;

    /**
     * @var string
     *
     * @ORM\Column(name="cmp_address", type="string", length=255, nullable=true)
     */
    private $cmpAddress;

    /**
     * @var integer
     *
     * @ORM\Column(name="cmp_phone", type="bigint", nullable=true)
     */
    private $cmpPhone;

    /**
     * @var string
     *
     * @ORM\Column(name="cmp_email", type="string", length=255, nullable=true)
     */
    private $cmpEmail;

    /**
     * @var string
     *
     * @ORM\Column(name="cmp_site", type="string", length=255, nullable=true)
     */
    private $cmpSite;

    /**
     * @var string
     *
     * @ORM\Column(name="cmp_ceo", type="string", length=255, nullable=true)
     */
    private $cmpCeo;

    /**
     * @var string
     *
     * @ORM\Column(name="cmp_register", type="string", length=255, nullable=true)
     */
    private $cmpRegister;

    /**
     * @var string
     *
     * @ORM\Column(name="cmp_url", type="string", length=255, nullable=false)
     */
    private $cmpUrl;

    /**
     * @var \Catalog\WebBundle\Entity\ComCategory
     *
     * @ORM\ManyToOne(targetEntity="Catalog\WebBundle\Entity\ComCategory")
     * @ORM\JoinColumns(
     *   @ORM\JoinColumn(name="cmp_category", referencedColumnName="cat_id")
     * )
     */
    private $cmpCategory;

    /**
     * @var \Catalog\WebBundle\Entity\ComCity
     *
     * @ORM\ManyToOne(targetEntity="Catalog\WebBundle\Entity\ComCity")
     * @ORM\JoinColumns(
     *   @ORM\JoinColumn(name="cmp_city", referencedColumnName="cit_id")
     * )
     */
    private $cmpCity;



    /**
     * Get cmpId
     *
     * @return integer 
     */
    public function getCmpId()
    
        return $this->cmpId;
    

    /**
     * Set cmpName
     *
     * @param string $cmpName
     * @return ComCompany
     */
    public function setCmpName($cmpName)
    
        $this->cmpName = $cmpName;

        return $this;
    

    /**
     * Get cmpName
     *
     * @return string 
     */
    public function getCmpName()
    
        return $this->cmpName;
    

    /**
     * Set cmpCode
     *
     * @param integer $cmpCode
     * @return ComCompany
     */
    public function setCmpCode($cmpCode)
    
        $this->cmpCode = $cmpCode;

        return $this;
    

    /**
     * Get cmpCode
     *
     * @return integer 
     */
    public function getCmpCode()
    
        return $this->cmpCode;
    

    /**
     * Set cmpVat
     *
     * @param string $cmpVat
     * @return ComCompany
     */
    public function setCmpVat($cmpVat)
    
        $this->cmpVat = $cmpVat;

        return $this;
    

    /**
     * Get cmpVat
     *
     * @return string 
     */
    public function getCmpVat()
    
        return $this->cmpVat;
    

    /**
     * Set cmpEmp
     *
     * @param integer $cmpEmp
     * @return ComCompany
     */
    public function setCmpEmp($cmpEmp)
    
        $this->cmpEmp = $cmpEmp;

        return $this;
    

    /**
     * Get cmpEmp
     *
     * @return integer 
     */
    public function getCmpEmp()
    
        return $this->cmpEmp;
    

    /**
     * Set cmpReturn
     *
     * @param string $cmpReturn
     * @return ComCompany
     */
    public function setCmpReturn($cmpReturn)
    
        $this->cmpReturn = $cmpReturn;

        return $this;
    

    /**
     * Get cmpReturn
     *
     * @return string 
     */
    public function getCmpReturn()
    
        return $this->cmpReturn;
    

    /**
     * Set cmpReturnFrom
     *
     * @param string $cmpReturnFrom
     * @return ComCompany
     */
    public function setCmpReturnFrom($cmpReturnFrom)
    
        $this->cmpReturnFrom = $cmpReturnFrom;

        return $this;
    

    /**
     * Get cmpReturnFrom
     *
     * @return string 
     */
    public function getCmpReturnFrom()
    
        return $this->cmpReturnFrom;
    

    /**
     * Set cmpReturnTill
     *
     * @param string $cmpReturnTill
     * @return ComCompany
     */
    public function setCmpReturnTill($cmpReturnTill)
    
        $this->cmpReturnTill = $cmpReturnTill;

        return $this;
    

    /**
     * Get cmpReturnTill
     *
     * @return string 
     */
    public function getCmpReturnTill()
    
        return $this->cmpReturnTill;
    

    /**
     * Set cmpAddress
     *
     * @param string $cmpAddress
     * @return ComCompany
     */
    public function setCmpAddress($cmpAddress)
    
        $this->cmpAddress = $cmpAddress;

        return $this;
    

    /**
     * Get cmpAddress
     *
     * @return string 
     */
    public function getCmpAddress()
    
        return $this->cmpAddress;
    

    /**
     * Set cmpPhone
     *
     * @param integer $cmpPhone
     * @return ComCompany
     */
    public function setCmpPhone($cmpPhone)
    
        $this->cmpPhone = $cmpPhone;

        return $this;
    

    /**
     * Get cmpPhone
     *
     * @return integer 
     */
    public function getCmpPhone()
    
        return $this->cmpPhone;
    

    /**
     * Set cmpEmail
     *
     * @param string $cmpEmail
     * @return ComCompany
     */
    public function setCmpEmail($cmpEmail)
    
        $this->cmpEmail = $cmpEmail;

        return $this;
    

    /**
     * Get cmpEmail
     *
     * @return string 
     */
    public function getCmpEmail()
    
        return $this->cmpEmail;
    

    /**
     * Set cmpSite
     *
     * @param string $cmpSite
     * @return ComCompany
     */
    public function setCmpSite($cmpSite)
    
        $this->cmpSite = $cmpSite;

        return $this;
    

    /**
     * Get cmpSite
     *
     * @return string 
     */
    public function getCmpSite()
    
        return $this->cmpSite;
    

    /**
     * Set cmpCeo
     *
     * @param string $cmpCeo
     * @return ComCompany
     */
    public function setCmpCeo($cmpCeo)
    
        $this->cmpCeo = $cmpCeo;

        return $this;
    

    /**
     * Get cmpCeo
     *
     * @return string 
     */
    public function getCmpCeo()
    
        return $this->cmpCeo;
    

    /**
     * Set cmpRegister
     *
     * @param string $cmpRegister
     * @return ComCompany
     */
    public function setCmpRegister($cmpRegister)
    
        $this->cmpRegister = $cmpRegister;

        return $this;
    

    /**
     * Get cmpRegister
     *
     * @return string 
     */
    public function getCmpRegister()
    
        return $this->cmpRegister;
    

    /**
     * Set cmpUrl
     *
     * @param string $cmpUrl
     * @return ComCompany
     */
    public function setCmpUrl($cmpUrl)
    
        $this->cmpUrl = $cmpUrl;

        return $this;
    

    /**
     * Get cmpUrl
     *
     * @return string 
     */
    public function getCmpUrl()
    
        return $this->cmpUrl;
    

    /**
     * Set cmpCategory
     *
     * @param \Catalog\WebBundle\Entity\ComCategory $cmpCategory
     * @return ComCompany
     */
    public function setCmpCategory(\Catalog\WebBundle\Entity\ComCategory $cmpCategory = null)
    
        $this->cmpCategory = $cmpCategory;

        return $this;
    

    /**
     * Get cmpCategory
     *
     * @return \Catalog\WebBundle\Entity\ComCategory 
     */
    public function getCmpCategory()
    
        return $this->cmpCategory;
    

    /**
     * Set cmpCity
     *
     * @param \Catalog\WebBundle\Entity\ComCity $cmpCity
     * @return ComCompany
     */
    public function setCmpCity(\Catalog\WebBundle\Entity\ComCity $cmpCity = null)
    
        $this->cmpCity = $cmpCity;

        return $this;
    

    /**
     * Get cmpCity
     *
     * @return \Catalog\WebBundle\Entity\ComCity 
     */
    public function getCmpCity()
    
        return $this->cmpCity;
    

【问题讨论】：

请发布您尝试访问城市的代码，以及您实体类的相关部分

你只有一个结果，所以它应该只是 $info->getCmpCity();对？或者如果您有多个结果，您是在问如何在一个数组中获取所有“cit”？

@JasonRoman 我更新了帖子，现在你可以看到我的实体@Derick 我不是 hoave methos $info->getCmpCity() 请看我的代码。

【参考方案1】：

getResult() 将整个结果集作为可迭代数组集合返回，不是单个结果。因此，当您使用setMaxResults(1) 时，明智的做法是使用getSingleResult() 获取单个结果：

$info = $query->getSingleResult();

如果没有返回结果，$info 将是null。否则，您将能够使用以下方法访问 cmpCity 属性：

$cmpCity = $info->getCmpCity();

同样，如果没有与 ComCompany 对象关联的 cmpCity，$cmpCity 将是 null。如果您想获取第一个 确实 具有关联 cmpCity 的 ComCompany 对象，请使用 innerJoin 而不是 leftJoin：

$query = $em->createQueryBuilder()
    ->select('com', 'cit')
    ->from('CatalogWebBundle:ComCompany', 'com')
    ->innerJoin('com.cmpCity', 'cit')
    ->getQuery()
    ->setMaxResults(1);

$info = $query->getSingleResult();
$cmpCity = $info->getCmpCity();

【参考方案2】：

这可能与结合 leftJoin 和 setMaxResults 时的 issue 有关。

关于如何进行查询已经有了答案：https://***.com/a/14886847/3726645