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

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();