Question

我在symfony类库中有这个功能：

public function findAllByIdShop($id)
{
    return $this->getEntityManager()
        ->createQuery(
            'SELECT s, c
            FROM  AppBundle:ShopCategory s
            JOIN  s.category c
            WHERE s.shop = :shop_id
            ORDER BY c.name'
        )
        ->setParameter(':shop_id', $id)
        ->getResult();
}

如果我通过＆＃34; SELECT s＆＃34;更改选择行，则查询将最后一个记录类别（带别名c）返回为NULL值。我将使用doctrine lazyloading获得正确的结果，我想避免延迟加载。

例如，如果我有四个名为＆＃34; c1，c2，c3，c4和＃34;在存储库查询中，我将获得c4为null。

我的班级看起来像那样（注意我使用多对一，单向关系来避免双向关系）

<?php

namespace AppBundle\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * ShopCategory
 *
 * @ORM\Table()
 * @ORM\Entity
  */
class ShopCategory
{


    /**
     * @ORM\Id
     * @ORM\ManyToOne(targetEntity="AppBundle\Entity\Shop")
     */
    private $Shop;


    /**
     * @ORM\Id
     * @ORM\ManyToOne(targetEntity="AppBundle\Entity\Category")
     */

    private $Category;


    /**
     * Set Shop
     *
     * @param AppBundle\Entity\Shop $Shop
     * @return ShopCategory
     */
    public function setShop(\AppBundle\Entity\Shop $Shop)
    {
    $this->Shop = $Shop;

    return $this;
    }

    /**
     * Get Shop
     *
     * @return AppBundle\Entity\Shop
     */
    public function getShop()
    {
    return $this->Shop;
    }

    /**
     * Set Category
     *
     * @param AppBundle\Entity\Category $Category
     * @return ShopCategory
     */
    public function setCategory(\AppBundle\Entity\Category $Category)
    {
    $this->Category = $Category;

    return $this;
    }

    /**
     * Get Category
     *
     * @return AppBundle\Entity\Category 
     */
    public function getCategory()
    {
    return $this->Category;
    }
}

Answer 1

试试这个

 public function findAllByIdShop($id)
    {
        return $this->getEntityManager()
            ->createQuery(
                'SELECT s, c
                FROM  AppBundle:ShopCategory sc
                JOIN  sc.category c
                JOIN  sc.shop s
                WHERE s.<id_field> = :shop_id
                ORDER BY c.name'
            )
            ->setParameter(':shop_id', $id)
            ->getResult();
    }

Doctrine在JOIN上返回null对象选择

1 个答案: