laravel关联查询，同时返回关联表和被关联表的信息，怎么做

Posted 2023-04-24

参考技术A 假设现在两个 Model

Post 文章
class Post extends Model
// 省略
public function comments()
return $this->hasMany(Comment::class);



Comment 评论
class Comment extends Model
// 省略
public function post()
return $this->belongsTo(Post::class);



// 预加载，可以在取得文章同时把关联的Comment一同取出
Post::with('comments')->find(1)->get();本回答被提问者采纳

根据外键名找到主表和关联表的相关列

 

select fk.name fkname
,ftable.name ftablename
,cn.name fkcol
,rtable.name ftablename
,cn1.name rkcol
from sysforeignkeys
join sysobjects fk on sysforeignkeys.constid = fk.id
join sysobjects ftable on sysforeignkeys.fkeyid = ftable.id
join sysobjects rtable on sysforeignkeys.rkeyid = rtable.id
join syscolumns cn on sysforeignkeys.fkeyid = cn.id
and sysforeignkeys.fkey = cn.colid
join syscolumns cn1 on sysforeignkeys.rkeyid = cn1.id
and sysforeignkeys.rkey = cn1.colid
where fk.name=‘FK_PolicyData_System_CompanyTree‘