[英]how to save many foreign key at one cell
i have two tables on mysql我在 mysql 上有两张桌子
Id ID | item_name项目名 | room_id room_id | other column其他栏目 |
---|---|---|---|
1 1 | table桌子 | 1 1 | |
2 2 | book书 | 2 2 | |
3 3 | clock钟 | 2 2 |
id ID | room_name房间名 |
---|---|
1 1 | Teacher room教师室 |
2 2 | class room class房 |
I have a case that one item can be in several rooms,我有一个案例,一件物品可以放在几个房间里,
I was asked for the data not to be duplicated as follows我被要求不重复数据如下
Id ID | item_name项目名 | room_id room_id | other column其他栏目 |
---|---|---|---|
1 1 | table桌子 | 1 1 | |
2 2 | table桌子 | 2 2 |
how to store at one row column room_id has many value like this如何存储在一行列 room_id 有很多这样的值
Id ID | item_name项目名 | room_id room_id | other column其他栏目 |
---|---|---|---|
1 1 | table桌子 | 1,2 1,2 |
I've done it using a string and then I extracted it using explode() but in mysql table I can't connect to the room table anymore我已经使用字符串完成了它,然后我使用explode() 将其提取但在mysql 表中我无法再连接到房间表
you can achieve that by using a pivot table您可以通过使用 pivot 表来实现
table: item_room
columns: item_id, room_id
models should look like this模型应该是这样的
namespace App\Models;
class Item extends Model
{
public function rooms()
{
return $this->belongsToMany(Room::class)->using(ItemRoom::class);
}
}
namespace App\Models;
class Room extends Model
{
public function items()
{
return $this->belongsToMany(Item::class)->using(ItemRoom::class);
}
}
namespace App\Models;
class ItemRoom extends Pivot
{
}
# you can get data using eager loading, quering relation, etc.
$room = Room::find(1);
foreach($room->items() as $items){
//todo
}
$item = Item::find(1);
foreach($item->rooms() as $items){
//todo
}
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