php使用yield处理并发（Yii2.0框架模型多表关联查询示例）

php使用yield处理并发

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：

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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

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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

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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

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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

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

join

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1 2	//查询关联表的所有数据 $user = User->find()->with('right')->asArray()->all();

希望本文所述对大家基于Yii框架的PHP程序设计有所帮助。

原文链接：https://blog.csdn.net/qq_42176520/article/details/91391201