我有一个用户表和一个约会表。在约会表中,我有两个用户ID(customer_id,staff_id)。我想检索所有带有客户名称和员工姓名的约会。
users table
id
name
appointments table
id
staff_id(user_id)
customer_id(user_id)
datetime
如您所见,我必须使用约会表两次加入users表。 通常我使用内部联接来执行此操作。
我们可以使用with()来完成Laravel雄辩的急切加载吗?
我们可以这样做:
appointments::with('users' * )->get();?
* Do something here to inner join users table twice, and read user1.name as staff_name, user2.name as customer_name.
这是我需要的最终输出:
appointment_id
staff_id
staff_name
customer_id
customer_name
datetime
我有另一个问题,以下查询中的第二个参数是什么?
User::with(array(
'post'=> function() use $region {
//what is use $region means? Can you give me an example?
}
));
谢谢!
答案 0 :(得分:17)
class T1 extends Eloquent {
protected $table = 't1';
}
class T2 extends Eloquent {
protected $table = 't2';
public function customer()
{
return $this->belongsTo('T1','c_id');//c_id - customer id
}
public function staff()
{
return $this->belongsTo('T1','s_id');//s_id - staff id
}
}
1)使用“with”:
$list = \T2::with('customer')->with('staff')->get();
foreach ($list as $row) {
echo 'ID: '.$row->id.', customer: '.$row->customer->name.', staff: '.$row->staff->name.'<br>';
}
2)加入:
$list = \T2::leftJoin('t1 as customer_table', 'customer_table.id','=','t2.c_id')
->leftJoin('t1 as staff_table', 'staff_table.id','=','t2.s_id')
->select('staff_table.name as staff_name','customer_table.name as customer_name')
->get();
foreach ($list as $row) {
echo 'customer: '.$row->customer_name.', staff: '.$row->staff_name.'<br>';
}
关于第二个问题 - 这是针对子查询的。查看文档:{{3}}