Doctrine orm 在条令2.2中反映MySQL多态关联_Doctrine Orm_Codeigniter 2

Doctrine orm 在条令2.2中反映MySQL多态关联

doctrine-orm

Doctrine orm 在条令2.2中反映MySQL多态关联,doctrine-orm,codeigniter-2,Doctrine Orm,Codeigniter 2,我正在使用Doctrine 2.2.0和Codeigniter。我对条令（或ORM）还是个新手我正在基于YAML文件设置实体和代理类，这很好。在我的理论类中，我在反映数据库中的多态关联方面确实存在问题。我正在寻找一个具体的例子，说明如何在学说中实现以下多态关联在我的数据库中有一个名为products的表。根据字段object\u type和object\u id的值，我希望与表videos或表cars中的记录相关（我在这里简化了它）。我想把这两种产品类型放在两个单独的表中，因为一个和另一个无

我正在使用Doctrine 2.2.0和Codeigniter。我对条令（或ORM）还是个新手

我正在基于YAML文件设置实体和代理类，这很好。在我的理论类中，我在反映数据库中的多态关联方面确实存在问题。我正在寻找一个具体的例子，说明如何在学说中实现以下多态关联

在我的数据库中有一个名为products的表。根据字段

object\u type

和

object\u id

的值，我希望与表videos或表cars中的记录相关（我在这里简化了它）。我想把这两种产品类型放在两个单独的表中，因为一个和另一个无关，而且两个表都和其他表相关

我查看了条令继承文档和其他示例，但它似乎对我没有帮助如果可能，我希望避免将
description
和
price
列添加到表video和cars

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 |

您找对了地方，继承映射肯定是实现这一点所需要的。据我所知，这是“类表继承”的完美例子

查看手册中有关如何实施此操作的示例/说明

您找对了地方，继承映射肯定是实现这一点所需要的。据我所知，这是“类表继承”的完美例子

查看手册中有关如何实施此操作的示例/说明

我自己找到了解决办法。我在下面列出了我所做的不同步骤。这个答案非常大，但我尽量做到完整

最重要的内容是产品YAML文件

inheritanceType:JOINED

，

discriminator列：

，

discriminatorMap:

以及视频和汽车实体类

class Video extensed Product

，

class Car extensed Product

1）数据库模式 2） DOCTION YAML文件（您需要从中创建实体和代理类） 实体.Artist.dcm.yml

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

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

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

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

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

实体、品牌、dcm.yml

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

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

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

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

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

实体.Car.dcm.yml

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

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

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

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

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

实体.Product.dcm.yml

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

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

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

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

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

实体.Video.dcm.yml

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

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

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

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

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

3）创建实体和代理类我使用CodeIgniter

！！使用产品扩展视频和汽车非常重要-请参见下文

这将导致以下实体类

Artist.php

Brand.php

Car.php

Product.php

Video.php

3）创建新车和新视频这就是我的CodeIgniter控制器中的内容。代码假定您创建了一个名为Metallica的艺术家和一个名为Ford的品牌

4）提取所有产品关于如何提取所有产品的示例

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());
    }
}