Question

我试图通过数据透视表在同一个表上建立关系。我有两个表：companies（id）和一个表company_budgets（id，company_id，sponsor_id，budget）。我需要以下关系：

公司表中的公司可以赞助公司表中的多家公司
公司表中的公司可以有多家公司表赞助商

我尝试了不同的变体

public function sponsors() {
  return $this->belongsToMany('App\Company','company_sponsors','company_id','sponsor_id')->withPivot('budget');
}

public function companies() {
  return $this->belongsToMany('App\Company','company_sponsors','sponsor_id','company_id')->withPivot('budget');
}

但是...

接下来的问题是如何从数据透视表中检索数据？如何查询公司是否获得赞助以及公司如何赞助？

我想查询我的表格：

SELECT
companies.id AS "Company ID",
companies.`name` AS "Sponsoring company name",
company_sponsors.sponsor_id AS "Sponsored company ID",
(SELECT companies.`name` FROM companies WHERE companies.id = sponsor_id) AS "Sponsored company",
company_sponsors.budget AS "Sponsored budget"
FROM company_sponsors
INNER JOIN companies ON companies.id = company_sponsors.company_id
WHERE companies.id = 33;


SELECT
companies.id AS "Company ID",
companies.`name` AS "Sponsored company name",
company_sponsors.company_id AS "Sponsor ID",
(SELECT companies.`name` FROM companies WHERE companies.id = company_id) AS "Sponsor company name",
company_sponsors.budget AS "Sponsoring budget"
FROM companies
LEFT JOIN company_sponsors ON company_sponsors.sponsor_id = companies.id
WHERE companies.id = 10;

Laravel 5关系很多，有两个表

0 个答案: