Yii2.0框架模型多表关联查询示例

本文实例讲述了yii2.0框架模型多表关联查询。分享给大家供大家参考，具体如下：

联表查询–hasmany：

use app\models\user;
$right = right::findone(2);
//$user = user::find()->where(['right_id' => $right->attributes['id']])->all();
$user = $right->hasmany(user::classname(),['right_id' => 'id'])->all();
//right_id为user::classname()表中字段，id为right::findone(2)表字段

多表关联一对多查询优化

如果多次用到同表相同查询：

\models\rught.php

namespace app\models;
use \yii\db\activerecord;
class right extends activerecord
{
  public function getusers()
  {
    $users = $this->hasmany(user::classname(),['right_id' => 'id'])->asarray()p->all();
    return $users;
  }
}

\controller\home\actionabout

public function actionabout()
{
  $right = right::findone(2);
//  $users = $right->getrights();
  $users = $right->rights;
  dd($users);
  return $this->render('about');
}

多表关联一对一查询

\models\user.php

namespace app\models;
use \yii\db\activerecord;
class user extends activerecord
{
  public function getright()
  {
    $right = $this->hasone(right::classname,['id' => 'right_id'])->asarray();
    return $right;
  }
}

\controller\home\actionabout

$user = user::findone(1);
$right = $user->user;
dd($right);
return $this->render('about');

join

//查询关联表的所有数据
$user = user->find()->with('right')->asarray()->all();