DQL與JOIN Doctrine2和Symfony2

Question

您好我有兩張桌子：產品和庫存。 他們有很多關系，看起來像這樣：

股票：

+------------+--------------+------+-----+---------+----------------+
| Field      | Type         | Null | Key | Default | Extra          |
+------------+--------------+------+-----+---------+----------------+ 
| id         | int(11)      | NO   | PRI | NULL    | auto_increment |
| stock_name | varchar(255) | NO   |     | NULL    |                | 
| address    | varchar(255) | NO   |     | NULL    |                |
+------------+--------------+------+-----+---------+----------------+

產品介紹：

+----------+--------------+------+-----+---------+----------------+
| Field    | Type         | Null | Key | Default | Extra          |
+----------+--------------+------+-----+---------+----------------+
| id       | int(11)      | NO   | PRI | NULL    | auto_increment |
| stock_id | int(11)      | YES  | MUL | NULL    |                |
| name     | varchar(255) | NO   |     | NULL    |                |
| delivery | varchar(255) | NO   |     | NULL    |                |
+----------+--------------+------+-----+---------+----------------+

實體

class Products
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @ORM\Column(type="string")
     */
    private $name;

    /**
     * @ORM\Column(type="string")
     */
    private $delivery;

    /**
     * @ORM\ManyToOne(targetEntity="Stock", inversedBy="products")
     * @ORM\JoinColumn(nullable=true)
     */
    private $stock;

    /**
     * @return mixed
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * @param mixed $name
     */
    public function setName($name)
    {
        $this->name = $name;
    }

    /**
     * @return mixed
     */
    public function getDelivery()
    {
        return $this->delivery;
    }

    /**
     * @param mixed $delivery
     */
    public function setDelivery($delivery)
    {
        $this->delivery = $delivery;
    }

    /**
     * @return mixed
     */
    public function getStock()
    {
        return $this->stock;
    }

    /**
     * @param mixed $stock
     */
    public function setStock(Stock $stock)
    {
        $this->stock = $stock;
    }

    /**
     * @return mixed
     */
    public function getId()
    {
        return $this->id;
    }
}

class Stock
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @ORM\Column(type="string")
     */
    private $stock_name;

    /**
     * @ORM\Column(type="string")
     */
    private $address;

    /**
     * @ORM\OneToMany(
     *      targetEntity="Products",
     *      mappedBy="stock",
     *      orphanRemoval=true
     * )
     */
    private $products;

    /**
     * @return mixed
     */
    public function getStockName()
    {
        return $this->stock_name;
    }

    /**
     * @param mixed $stock_name
     */
    public function setStockName($stock_name)
    {
        $this->stock_name = $stock_name;
    }

    /**
     * @return mixed
     */
    public function getAddress()
    {
        return $this->address;
    }

    /**
     * @param mixed $address
     */
    public function setAddress($address)
    {
        $this->address = $address;
    }

    /**
     * @return mixed
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * @return mixed
     */
    public function getProducts()
    {
        return $this->products;
    }

    /**
     * @param mixed $products
     */
    public function setProducts($products)
    {
        $this->products = $products;
    }
}

我需要sql，它給我所有與庫存ID 1相關聯的交貨地址，並在表格庫中僅將1個庫存地址添加到ID 1下。 該數組應如下所示：

Array ( 
    [0] => Stock Address
    [1] => delivery1
    [2] => delivery2
    [3] => delivery3
)

我嘗試這個語句，但它在數組中給出了多個庫存地址和數組：

$qb = $this->getEntityManager()->createQuery(
    "SELECT o.delivery , p.address
        FROM AppBundle:Products o 
        JOIN o.stock p
        WHERE o.stock =1
    ");

return $qb->getScalarResult();

以及本聲明的結果：

Array ( 
    [0] => Array ( 
        [delivery] => Spoon str, USA 
        [address] => Wall street 1, USA 
    ) 
    [1] => Array ( 
        [delivery] => Lincoln street, USA 
        [address] => Wall street 1, USA 
    )
)

Answer 1

您將無法通過一個DQL語句直接檢索所需的數組。 原因是您實際上希望示例中提取的四行來自兩個不同的列。

所以你需要以某種方式處理結果。 例如，您可以將代碼段更改為：

$qb = $this->getEntityManager()->createQuery(
"SELECT o.delivery , p.address
    FROM AppBundle:Products o 
    JOIN o.stock p
    WHERE o.stock = 1
");

$result = $qb->getScalarResult();

return array_merge([$result[0]['address']], array_column($result, 'delivery'));

因此，您將地址作為要返回的數組的第一個元素，並僅添加所有結果的傳遞列，並添加它們。