多态一对多关联

优质

小牛编辑

143浏览

2023-12-01

比如我们有一张文章表，一张书籍表，一张评论表。文章和书籍的评论记录都在同一张评论表中。

mysql> desc tb_article;
+---------+------------------+------+-----+---------+----------------+
| Field   | Type             | Null | Key | Default | Extra          |
+---------+------------------+------+-----+---------+----------------+
| id      | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| title   | varchar(32)      | NO   |     | NULL    |                |
| content | text             | NO   |     | NULL    |                |
+---------+------------------+------+-----+---------+----------------+

mysql> desc tb_book;
+-------+------------------+------+-----+---------+----------------+
| Field | Type             | Null | Key | Default | Extra          |
+-------+------------------+------+-----+---------+----------------+
| id    | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| title | varchar(32)      | NO   |     | NULL    |                |
+-------+------------------+------+-----+---------+----------------+

mysql> desc tb_comment;
+-------------+------------------+------+-----+---------+----------------+
| Field       | Type             | Null | Key | Default | Extra          |
+-------------+------------------+------+-----+---------+----------------+
| id          | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| content     | text             | NO   |     | NULL    |                |
| type        | tinyint(4)       | NO   |     | NULL    |                |
| relation_id | int(10) unsigned | NO   |     | NULL    |                |
+-------------+------------------+------+-----+---------+----------------+

定义

一对多关联会用到的注解：

@PolymorphicOneToMany、@PolymorphicToOne、@JoinFrom、@JoinTo、@AutoSelect、@AutoInsert、@AutoUpdate、@AutoSave、@AutoDelete

如 imi-demo 中代码所示，Article定义了一个$comments属性，这个属性关联Comment模型。

Article中id与Comment中relation_id关联，并且type为1的才关联。

Article 模型

/**
 * Article
 * @Entity
 * @Table(name="tb_article", id={"id"})
 * @property int $id
 * @property string $title
 * @property string $content
 * @property \Imi\Util\ArrayList $comments
 * @property \Imi\Util\ArrayList $taggables
 * @property \Imi\Util\ArrayList $tags
 */
class Article extends Model
{
    /**
     * id
     * @Column(name="id", type="int", length=10, accuracy=0, nullable=false, default="", isPrimaryKey=true, primaryKeyIndex=0, isAutoIncrement=true)
     * @var int
     */
    protected $id;

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

    /**
     * 赋值 id
     * @param int $id id
     * @return static
     */ 
    public function setId($id)
    {
        $this->id = $id;
        return $this;
    }

    /**
     * title
     * @Column(name="title", type="varchar", length=32, accuracy=0, nullable=false, default="", isPrimaryKey=false, primaryKeyIndex=-1, isAutoIncrement=false)
     * @var string
     */
    protected $title;

    /**
     * 获取 title
     *
     * @return string
     */ 
    public function getTitle()
    {
        return $this->title;
    }

    /**
     * 赋值 title
     * @param string $title title
     * @return static
     */ 
    public function setTitle($title)
    {
        $this->title = $title;
        return $this;
    }

    /**
     * content
     * @Column(name="content", type="text", length=0, accuracy=0, nullable=false, default="", isPrimaryKey=false, primaryKeyIndex=-1, isAutoIncrement=false)
     * @var string
     */
    protected $content;

    /**
     * 获取 content
     *
     * @return string
     */ 
    public function getContent()
    {
        return $this->content;
    }

    /**
     * 赋值 content
     * @param string $content content
     * @return static
     */ 
    public function setContent($content)
    {
        $this->content = $content;
        return $this;
    }

    /**
     * 评论
     * 
     * @PolymorphicOneToMany(model=ImiDemo\HttpDemo\MainServer\Model\Comment::class, type="type", typeValue=1)
     * @JoinTo("relation_id")
     * @AutoSave(orphanRemoval=true)
     * @AutoDelete
     *
     * @var \Imi\Util\ArrayList
     */
    protected $comments;

    /**
     * Get 评论
     *
     * @return  \ImiDemo\HttpDemo\MainServer\Model\Comment[]
     */ 
    public function getComments()
    {
        return $this->comments;
    }

    /**
     * Set 评论
     *
     * @param  \ImiDemo\HttpDemo\MainServer\Model\Comment[]  $comments  评论
     *
     * @return  self
     */ 
    public function setComments($comments)
    {
        $this->comments = $comments;

        return $this;
    }

}

主要参考$comments上的注解，与多态一对多一样。

Comment 模型

/**
 * Comment
 * @Entity
 * @Table(name="tb_comment", id={"id"})
 * @property int $id
 * @property string $content
 * @property int $type
 * @property int $relationId
 */
class Comment extends Model
{
    /**
     * id
     * @Column(name="id", type="int", length=10, accuracy=0, nullable=false, default="", isPrimaryKey=true, primaryKeyIndex=0, isAutoIncrement=true)
     * @var int
     */
    protected $id;

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

    /**
     * 赋值 id
     * @param int $id id
     * @return static
     */ 
    public function setId($id)
    {
        $this->id = $id;
        return $this;
    }

    /**
     * content
     * @Column(name="content", type="text", length=0, accuracy=0, nullable=false, default="", isPrimaryKey=false, primaryKeyIndex=-1, isAutoIncrement=false)
     * @var string
     */
    protected $content;

    /**
     * 获取 content
     *
     * @return string
     */ 
    public function getContent()
    {
        return $this->content;
    }

    /**
     * 赋值 content
     * @param string $content content
     * @return static
     */ 
    public function setContent($content)
    {
        $this->content = $content;
        return $this;
    }

    /**
     * type
     * @Column(name="type", type="tinyint", length=4, accuracy=0, nullable=false, default="", isPrimaryKey=false, primaryKeyIndex=-1, isAutoIncrement=false)
     * @var int
     */
    protected $type;

    /**
     * 获取 type
     *
     * @return int
     */ 
    public function getType()
    {
        return $this->type;
    }

    /**
     * 赋值 type
     * @param int $type type
     * @return static
     */ 
    public function setType($type)
    {
        $this->type = $type;
        return $this;
    }

    /**
     * relation_id
     * @Column(name="relation_id", type="int", length=10, accuracy=0, nullable=false, default="", isPrimaryKey=false, primaryKeyIndex=-1, isAutoIncrement=false)
     * @var int
     */
    protected $relationId;

    /**
     * 获取 relationId
     *
     * @return int
     */ 
    public function getRelationId()
    {
        return $this->relationId;
    }

    /**
     * 赋值 relationId
     * @param int $relationId relation_id
     * @return static
     */ 
    public function setRelationId($relationId)
    {
        $this->relationId = $relationId;
        return $this;
    }

}

查询

常见的增删改查就不写了，和一对多关联一样用法

评论模型反查文章模型

注解及用法与一对一相同