php - 多个连接 laravel php

Question

我有一个博客应用程序，它有三个表，我想为任何搜索查询查看这些表。

三个表:posts，categories，tags。

模型:

帖子:

class Post extends Model
{
    public function category(){
        return $this->belongsTo('App\Category');
    }

    public function tags(){
        return $this->belongsToMany('App\Tag','post_tag','post_id','tag_id');
    }

    public function users(){
        return $this->belongsTo('App\User','author_id');
    }
}

标签:

class Tag extends Model
{
    public function posts(){
        return $this->belongsToMany('App\Post','post_tag','tag_id','post_id');
    }
}

类别:

class Category extends Model
{
    protected $table='categories';


    public function posts(){
        return $this->hasMany('App\Post');
    }
}

表结构

/*Table: posts*/
----------------

/*Column Information*/
----------------------

Field        Type              Collation        Null    Key     Default  Extra           Privileges                       Comment  
-----------  ----------------  ---------------  ------  ------  -------  --------------  -------------------------------  ---------
id           int(10) unsigned  (NULL)           NO      PRI     (NULL)   auto_increment  select,insert,update,references           
created_at   timestamp         (NULL)           YES             (NULL)                   select,insert,update,references           
updated_at   timestamp         (NULL)           YES             (NULL)                   select,insert,update,references           
title        varchar(255)      utf8_unicode_ci  NO              (NULL)                   select,insert,update,references           
body         text              utf8_unicode_ci  NO              (NULL)                   select,insert,update,references           
slug         varchar(255)      utf8_unicode_ci  NO      UNI     (NULL)                   select,insert,update,references           
category_id  int(10) unsigned  (NULL)           YES             (NULL)                   select,insert,update,references           
image_path   varchar(255)      utf8_unicode_ci  YES             (NULL)                   select,insert,update,references           
author_id    int(10) unsigned  (NULL)           NO      MUL     (NULL)                   select,insert,update,references 



/*Table: tags*/
---------------

/*Column Information*/
----------------------

Field       Type              Collation        Null    Key     Default  Extra           Privileges                       Comment  
----------  ----------------  ---------------  ------  ------  -------  --------------  -------------------------------  ---------
id          int(10) unsigned  (NULL)           NO      PRI     (NULL)   auto_increment  select,insert,update,references           
name        varchar(255)      utf8_unicode_ci  NO              (NULL)                   select,insert,update,references           
created_at  timestamp         (NULL)           YES             (NULL)                   select,insert,update,references           
updated_at  timestamp         (NULL)           YES             (NULL)                   select,insert,update,references   

/*Table: categories*/
---------------------

/*Column Information*/
----------------------

Field       Type              Collation        Null    Key     Default  Extra           Privileges                       Comment  
----------  ----------------  ---------------  ------  ------  -------  --------------  -------------------------------  ---------
id          int(10) unsigned  (NULL)           NO      PRI     (NULL)   auto_increment  select,insert,update,references           
name        varchar(255)      utf8_unicode_ci  NO              (NULL)                   select,insert,update,references           
created_at  timestamp         (NULL)           YES             (NULL)                   select,insert,update,references           
updated_at  timestamp         (NULL)           YES             (NULL)                   select,insert,update,references 

/*Table: post_tag*/
-------------------

/*Column Information*/
----------------------

Field    Type              Collation  Null    Key     Default  Extra           Privileges                       Comment  
-------  ----------------  ---------  ------  ------  -------  --------------  -------------------------------  ---------
id       int(10) unsigned  (NULL)     NO      PRI     (NULL)   auto_increment  select,insert,update,references           
post_id  int(10) unsigned  (NULL)     NO      MUL     (NULL)                   select,insert,update,references           
tag_id   int(10) unsigned  (NULL)     NO      MUL     (NULL)                   select,insert,update,references 

我试图寻找的是任何搜索查询，假设如果他输入 doughnuts 它应该与 post title 或 category name 或 tag name，如果任何匹配发生在与之相关的帖子中，则应显示在搜索结果中。

我尝试过的

$post = DB::table('posts')
  ->join('categories', 'posts.category_id', 'categories.id')
  ->join('blog_users', 'blog_users.id', 'posts.author_id')
  ->join('post_tag', 'posts.id', 'post_tag.post_id')
  ->join('tags', 'tags.id', 'post_tag.tag_id')
  ->select(
     'posts.*', 'blog_users.name',
     'post_tag.tag_id', 'post_tag.post_id',
     'tags.name', 'categories.name')
  ->where(function($query) use ($search) {
    $query->where('posts.title', 'LIKE', $search)
          ->orWhere('categories.name', 'LIKE', $search)
          ->orWhere('tags.name', 'LIKE', $search);
  })
  ->paginate(5);

但这似乎给了我重复的结果并且效果不佳。

我想知道这个问题的更好解决方案吗？

Answer 1

当我发现自己在一个查询中使用多个连接时(特别是在 SELECT 查询中)，我通常做的是实现一个数据库 view 来封装查询背后的逻辑。

像这样创建迁移

DB::statement("DROP VIEW IF EXISTS view_post");
DB::statement(" 
CREATE VIEW view_post
AS
SELECT 
    'posts.*', 
    'blog_users.name AS blog_users_name',
    'post_tag.tag_id', 
    'post_tag.post_id',
    'tags.name AS tags_name', 
    'categories.name AS categories_name'
    FROM posts
        INNER JOIN categories
        ON (posts.category_id = categories.id)
        INNER JOIN blog_users
        ON (blog_users.id = posts.author_id)
        INNER JOIN post_tag
        ON (posts.id = post_tag.post_id)
        INNER JOIN tags
        ON (tags.id = post_tag.tag_id)
 ");

然后做一个这样的模型

class PostView extends Post { // <- To inherit properties of POST to here
    protected $table = 'view_post';
}

然后你可以简化你的查询

$post = PostView::where(function ($query) use ($search) {
            return $query->orWhere('title', 'LIKE', $search)
                ->orWhere('tags_name', 'LIKE', $search)
                ->orWhere('categories_name', 'LIKE', $search);
        })
            ->groupBy('id')
            ->paginate(5);

重要的是要记住，这完全取决于具体情况。 对于我的站来说，这是一种更简洁的方法，而不是混淆我的查询。我想你也可以采用这种方法。谢谢。

注意:您可能需要进一步修改 view 和 query 以表示您要实现的目标。