我正在使用Doctrine 2.2.0和Codeigniter。我是Doctrine的新手(或者是ORM的新手)。
我正在基于YAML文件设置实体和代理类,它们工作正常。我在Doctrine类中反映数据库中的多态关联时遇到了问题。我正在寻找一个关于如何在Doctrine中实现以下多态关联的具体示例。
在我的数据库中,我有一个名为products的表。根据字段object_type
和object_id
的值,我想要与表格视频中的记录或桌面车辆(我在此简化)相关联。我想将这两种产品类型保存在2个单独的表中,因为一个与另一个表无关,而且这两个表都与其他表相关。
我看了一下Doctrine Inheritance文档和其他示例,但它似乎对我没有帮助。 如果可能,我希望避免将列description
和price
添加到表格视频和广告。
非常感谢!
|Table: products |
|-----------------------------------------------------|
| ID | description | price | object_type | object_id |
|-----------------------------------------------------|
| 1 | A video | 20.00 | video | 12 |
| 2 | A car | 159.00 | car | 5 |
|Table: videos |
|--------------------------------------------|
| ID | filename | artist_id | date |
|--------------------------------------------|
| 12 | somename.mp4 | 189 | 2011-02-15 |
|Table: cars |
|------------------------------|
| ID | brand_id | model | year |
|------------------------------|
| 5 | 17 | astra | 2010 |
答案 0 :(得分:4)
自己找到解决方案。我在下面列出了我所做的不同步骤。这个答案非常大,但我试图尽可能完整。
最重要的事情在于产品YAML文件inheritanceType: JOINED
,discriminatorColumn:
,discriminatorMap:
以及视频和汽车实体类class Video extends Product
,class Car extends Product
。< / p>
CREATE TABLE IF NOT EXISTS `artists` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB;
CREATE TABLE IF NOT EXISTS `brands` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB;
CREATE TABLE IF NOT EXISTS `cars` (
`id` int(11) NOT NULL,
`model` varchar(255) NOT NULL,
`release_date` date NOT NULL,
`brand_id` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB;
CREATE TABLE IF NOT EXISTS `products` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`description` varchar(255) NOT NULL,
`price` double NOT NULL,
`object_type` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB;
CREATE TABLE IF NOT EXISTS `videos` (
`id` int(11) NOT NULL,
`file_name` varchar(255) NOT NULL,
`release_date` date NOT NULL,
`artist_id` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB;
<强> Entities.Artist.dcm.yml 强>
Entities\Artist:
type: entity
table: artists
id:
id:
type: integer
primary: true
notnull: true
generator:
strategy: AUTO
fields:
name:
type: string(255)
notnull: true
oneToMany:
videos:
targetEntity: Video
mappedBy: artist
options:
charset: utf8
type: InnoDB
<强> Entities.Brand.dcm.yml 强>
Entities\Brand:
type: entity
table: brands
id:
id:
type: integer
primary: true
notnull: true
generator:
strategy: AUTO
fields:
name:
type: string(255)
notnull: true
oneToMany:
cars:
targetEntity: Car
mappedBy: brand
options:
charset: utf8
type: InnoDB
<强> Entities.Car.dcm.yml 强>
Entities\Car:
type: entity
table: cars
fields:
model:
type: string
notnull: true
release_date:
type: date
notnull: true
oneToOne: #unidirectional
brand:
targetEntity: Brand
joinColumns:
brand_id:
referencedColumnName: id
options:
charset: utf8
type: InnoDB
<强> Entities.Product.dcm.yml 强>
Entities\Product:
type: entity
table: products
id:
id:
type: string
primary: true
notnull: true
generator:
strategy: AUTO
fields:
description:
type: string(255)
notnull: true
price:
type: decimal
notnull: true
inheritanceType: JOINED
discriminatorColumn:
name: object_type
type: string
length: 255
discriminatorMap:
video: Video
car: Car
options:
charset: utf8
type: InnoDB
<强> Entities.Video.dcm.yml 强>
Entities\Video:
type: entity
table: videos
fields:
file_name:
type: string
notnull: true
release_date:
type: date
notnull: true
oneToOne: #unidirectional
artist:
targetEntity: Artist
joinColumns:
artist_id:
referencedColumnName: id
options:
charset: utf8
type: InnoDB
我使用CodeIgniter。 I've used Joel Verhagen's excellent guide
!!将视频和汽车扩展到产品非常重要 - 见下文!!
这导致以下实体类
<强> Artist.php 强>
namespace Entities;
use Doctrine\ORM\Mapping as ORM;
/**
* Entities\Artist
*
* @ORM\Table(name="artists")
* @ORM\Entity
*/
class Artist
{
/**
* @var integer $id
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id;
/**
* @var string $name
*
* @ORM\Column(name="name", type="string", length=255)
*/
private $name;
/**
* @var \Doctrine\Common\Collections\ArrayCollection
*
* @ORM\OneToMany(targetEntity="Entities\Video", mappedBy="artist")
*/
private $videos;
public function __construct()
{
$this->videos = new \Doctrine\Common\Collections\ArrayCollection();
}
/**
* Get id
*
* @return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set name
*
* @param string $name
* @return Artist
*/
public function setName($name)
{
$this->name = $name;
return $this;
}
/**
* Get name
*
* @return string
*/
public function getName()
{
return $this->name;
}
/**
* Add videos
*
* @param Entities\Video $videos
*/
public function addVideo(\Entities\Video $videos)
{
$this->videos[] = $videos;
}
/**
* Get videos
*
* @return Doctrine\Common\Collections\Collection
*/
public function getVideos()
{
return $this->videos;
}
}
<强> Brand.php 强>
namespace Entities;
use Doctrine\ORM\Mapping as ORM;
/**
* Entities\Brand
*
* @ORM\Table(name="brands")
* @ORM\Entity
*/
class Brand
{
/**
* @var integer $id
*
* @ORM\Column(name="id", type="integer")
* @ORM\Id
* @ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id;
/**
* @var string $name
*
* @ORM\Column(name="name", type="string", length=255)
*/
private $name;
/**
* @var \Doctrine\Common\Collections\ArrayCollection
*
* @ORM\OneToMany(targetEntity="Entities\Car", mappedBy="brand")
*/
private $cars;
public function __construct()
{
$this->cars = new \Doctrine\Common\Collections\ArrayCollection();
}
/**
* Get id
*
* @return integer
*/
public function getId()
{
return $this->id;
}
/**
* Set name
*
* @param string $name
* @return Brand
*/
public function setName($name)
{
$this->name = $name;
return $this;
}
/**
* Get name
*
* @return string
*/
public function getName()
{
return $this->name;
}
/**
* Add cars
*
* @param Entities\Car $cars
*/
public function addCar(\Entities\Car $cars)
{
$this->cars[] = $cars;
}
/**
* Get cars
*
* @return Doctrine\Common\Collections\Collection
*/
public function getCars()
{
return $this->cars;
}
}
<强> Car.php 强>
namespace Entities;
use Doctrine\ORM\Mapping as ORM;
/**
* Entities\Car
*
* @ORM\Table(name="cars")
* @ORM\Entity
*/
class Car extends Product //Important that Car extends Product
{
/**
* @var string $model
*
* @ORM\Column(name="model", type="string")
*/
private $model;
/**
* @var date $release_date
*
* @ORM\Column(name="release_date", type="date")
*/
private $release_date;
/**
* @var Entities\Brand
*
* @ORM\OneToOne(targetEntity="Entities\Brand")
* @ORM\JoinColumns({
* @ORM\JoinColumn(name="brand_id", referencedColumnName="id", unique=true)
* })
*/
private $brand;
/**
* Set model
*
* @param string $model
* @return Car
*/
public function setModel($model)
{
$this->model = $model;
return $this;
}
/**
* Get model
*
* @return string
*/
public function getModel()
{
return $this->model;
}
/**
* Set release_date
*
* @param date $releaseDate
* @return Car
*/
public function setReleaseDate($releaseDate)
{
$this->release_date = $releaseDate;
return $this;
}
/**
* Get release_date
*
* @return date
*/
public function getReleaseDate()
{
return $this->release_date;
}
/**
* Set brand
*
* @param Entities\Brand $brand
* @return Car
*/
public function setBrand(\Entities\Brand $brand = null)
{
$this->brand = $brand;
return $this;
}
/**
* Get brand
*
* @return Entities\Brand
*/
public function getBrand()
{
return $this->brand;
}
}
<强> Product.php 强>
namespace Entities;
use Doctrine\ORM\Mapping as ORM;
/**
* Entities\Product
*
* @ORM\Table(name="products")
* @ORM\InheritanceType("JOINED")
* @ORM\DiscriminatorColumn(name="", type="", length=)
* @ORM\DiscriminatorMap({"video" = "Entities\Video", "car" = "Entities\Car"})
* @ORM\Entity
*/
class Product
{
/**
* @var string $id
*
* @ORM\Column(name="id", type="string")
* @ORM\Id
* @ORM\GeneratedValue(strategy="IDENTITY")
*/
private $id;
/**
* @var string $description
*
* @ORM\Column(name="description", type="string", length=255)
*/
private $description;
/**
* @var decimal $price
*
* @ORM\Column(name="price", type="decimal")
*/
private $price;
/**
* Get id
*
* @return string
*/
public function getId()
{
return $this->id;
}
/**
* Set description
*
* @param string $description
* @return Product
*/
public function setDescription($description)
{
$this->description = $description;
return $this;
}
/**
* Get description
*
* @return string
*/
public function getDescription()
{
return $this->description;
}
/**
* Set price
*
* @param decimal $price
* @return Product
*/
public function setPrice($price)
{
$this->price = $price;
return $this;
}
/**
* Get price
*
* @return decimal
*/
public function getPrice()
{
return $this->price;
}
}
<强> Video.php 强>
namespace Entities;
use Doctrine\ORM\Mapping as ORM;
/**
* Entities\Video
*
* @ORM\Table(name="videos")
* @ORM\Entity
*/
class Video extends Product //Important that Video extends Product
{
/**
* @var string $file_name
*
* @ORM\Column(name="file_name", type="string")
*/
private $file_name;
/**
* @var date $release_date
*
* @ORM\Column(name="release_date", type="date")
*/
private $release_date;
/**
* @var Entities\Artist
*
* @ORM\OneToOne(targetEntity="Entities\Artist")
* @ORM\JoinColumns({
* @ORM\JoinColumn(name="artist_id", referencedColumnName="id", unique=true)
* })
*/
private $artist;
/**
* Set file_name
*
* @param string $fileName
* @return Video
*/
public function setFileName($fileName)
{
$this->file_name = $fileName;
return $this;
}
/**
* Get file_name
*
* @return string
*/
public function getFileName()
{
return $this->file_name;
}
/**
* Set release_date
*
* @param date $releaseDate
* @return Video
*/
public function setReleaseDate($releaseDate)
{
$this->release_date = $releaseDate;
return $this;
}
/**
* Get release_date
*
* @return date
*/
public function getReleaseDate()
{
return $this->release_date;
}
/**
* Set artist
*
* @param Entities\Artist $artist
* @return Video
*/
public function setArtist(\Entities\Artist $artist = null)
{
$this->artist = $artist;
return $this;
}
/**
* Get artist
*
* @return Entities\Artist
*/
public function getArtist()
{
return $this->artist;
}
}
这是我的CodeIgniter控制器中的内容。该代码假设您创建了一个名为Metallica的艺术家和一个名为Ford的品牌。
public function createVideo()
{
//Instantiate new Entities\Video object
$video = new Entities\Video;
//Since it extends Entities\Product you can set the common Product properties
$video->setDescription('This is a Metallica clip');
$video->setPrice(19.95);
//Setting the custom Video properties
$artist = $this->doctrine->em->getRepository('Entities\Artist')->findOneBy(array('name' => 'Metallica'));
$video->setArtist($artist);
$video->setReleaseDate(new DateTime());
$video->setFileName('metallica.mp4');
//Save
$this->doctrine->em->persist($video);
$this->doctrine->em->flush();
}
public function createCar()
{
//Instantiate new Entities\Car object
$car = new Entities\Car;
//Since it extends Entities\Product you can set the common Product properties
$car->setDescription('This is Ford Mondeo of 2011');
$car->setPrice(19.95);
//Setting the custom Car properties
$brand = $this->doctrine->em->getRepository('Entities\Brand')->findOneBy(array('name' => 'Ford'));
$car->setBrand($brand);
$car->setReleaseDate(DateTime::createFromFormat('Y-m-d', '2011-11-15'));
$car->setModel('Mondeo');
//Save
$this->doctrine->em->persist($car);
$this->doctrine->em->flush();
}
关于如何提取所有产品的示例
public function extractAllProducts()
{
$products = $this->doctrine->em->getRepository('Entities\Product')->findAll();
foreach($products as $product)
{
printf('%s for € %s<br />', $product->getDescription(), $product->getPrice());
}
}
这导致
This is a Metallica clip for € 19.95
This is Ford Mondeo of 2011 for € 19.95
关于如何提取所有视频的示例
public function extractAllVideos()
{
$videos = $this->doctrine->em->getRepository('Entities\Video')->findAll();
foreach($videos as $video)
{
printf('%s, released %s for € %s<br />', $video->getDescription(), $video->getReleaseDate()->format('Y'), $video->getPrice());
}
}
这导致
This is a Metallica clip, released 2012 for € 19.95
答案 1 :(得分:0)
你正在寻找合适的地方,继承映射肯定是你需要实现的目标。据我所知,这是“类表继承”的完美示例。
查看手册以获取有关如何实现此目的的一些示例/说明。