Doctrine2查询

Question

我有2个实体，例如Country和Region。以下是实体：

Country实体：

<?php

namespace Catalog\Models\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
* A country page.
*
* @ORM\Entity
* @ORM\Table(name="tbl_country")
* @property string $name
* @property string $code
* @property string $latitude
* @property string $longitude
* @property string $countryLogo
* @property int $id
*/
class Country {

    /**
    * @ORM\Id
    * @ORM\Column(type="integer");
    * @ORM\GeneratedValue(strategy="AUTO")
    */
    private $id;

    /**
    * @ORM\Column(type="string",length=250,nullable=true)
    */
    private $name;

    /**
    * @ORM\Column(type="string",length=5,nullable=true)
    */
    private $code;

    /**
    * @ORM\Column(type="float",nullable=true)
    */
    private $latitude;

    /**
    * @ORM\Column(type="float",nullable=true)
    */
    private $longitude;

    /**
    * @ORM\Column(type="string",length=120,nullable=true)
    */
    private $countryLogo;

    /**
    * @ORM\OneToMany(targetEntity="Catalog\Models\Entity\Region", mappedBy="country")
    */
    protected $regions;

    public function getId() {
        return $this->id;
    }

    public function setId($id) {
        $this->id = $id;
    }

    public function getName() {
        return $this->name;
    }

    public function setName($name) {
        $this->name = $name;
    }

    public function getCode() {
        return $this->code;
    }

    public function setCode($code) {
        $this->code = $code;
    }

    public function getLatitude() {
        return $this->latitude;
    }

    public function setLatitude($latitude) {
        $this->latitude = $latitude;
    }

    public function getLongitude() {
        return $this->longitude;
    }

    public function setLongitude($longitude) {
        $this->longitude = $longitude;
    }

    public function getCountryLogo() {
        return $this->countryLogo;
    }

    public function setCountryLogo($countryLogo) {
        $this->countryLogo = $countryLogo;
    }

    public function getRegions() {
        return $this->regions;
    }

    public function setRegions($regions) {
        $this->regions = $regions;
    }

}

Region实体：

<?php

namespace Catalog\Models\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
* A region page.
*
* @ORM\Entity
* @ORM\Table(name="tbl_region")
* @property string $name
* @property string $code
* @property string $latitude
* @property string $longitude
* @property int $id
*/
class Region {

    /**
    * @ORM\Id
    * @ORM\Column(type="integer");
    * @ORM\GeneratedValue(strategy="AUTO")
    */
    private $id;

    /**
    * @ORM\Column(type="string",length=250,nullable=true)
    */
    private $name;

    /**
    * @ORM\Column(type="string",length=5,nullable=true)
    */
    private $code;

    /**
    * @ORM\Column(type="float",nullable=true)
    */
    private $latitude;

    /**
    * @ORM\Column(type="float",nullable=true)
    */
    private $longitude;

    /**
    * @ORM\ManyToOne(targetEntity="Catalog\Models\Entity\Country", inversedBy="regions")
    * @ORM\JoinColumn(name="country_id", referencedColumnName="id")
    */
    private $country;


    public function getId() {
        return $this->id;
    }

    public function setId($id) {
        $this->id = $id;
    }

    public function getName() {
        return $this->name;
    }

    public function setName($name) {
        $this->name = $name;
    }

    public function getCode() {
        return $this->code;
    }

    public function setCode($code) {
        $this->code = $code;
    }

    public function getLatitude() {
        return $this->latitude;
    }

    public function setLatitude($latitude) {
        $this->latitude = $latitude;
    }

    public function getLongitude() {
        return $this->longitude;
    }

    public function setLongitude($longitude) {
        $this->longitude = $longitude;
    }

    public function getCountry() {
        return $this->country;
    }

    public function setCountry($country) {
        $this->country = $country;
    }

}

我想要获得所有国家。但是当我喜欢这个时

$countries = $this->getEntityManager()->getRepository('Catalog\Models\Entity\Country')->findAll();

它将返回所有国家和地区。

当我尝试这个时

$countries = $this->getEntityManager()->createQuery("SELECT Country.id, Country.name FROM Catalog\Models\Entity\Country Country")->execute();

它只返回数组格式的Country。如何只获取对象格式的Country？

Answer 1

您可以尝试将区域分析标记为延迟加载：

 class Country {
     ...
     /**
     * @ORM\OneToMany(targetEntity="Catalog\Models\Entity\Region", mappedBy="country", fetch="EXTRA_LAZY")
     */
     protected $regions;

请参阅此处的文档：https://doctrine-orm.readthedocs.org/en/latest/tutorials/extra-lazy-associations.html?highlight=fetch

Answer 2

第一种方法应该有效，但是如果你想让你的查询工作，你应该这样做：

$query = $this->getEntityManager()->createQuery(
    "SELECT c FROM Catalog\Models\Entity\Country c"
);
$countries = $query->getResult();

问题出在你的select语句中。如果要在结果中使用对象（实体）的集合，则只应按其别名查询实体，而不在SELECT语句中指定属性。如果这样做，它将仅返回您以数组格式要求的属性。