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
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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;
}
}
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\\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');
}
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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 $right;
}
}
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\\controller\\home\\actionAbout
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$user = User::findOne(1);
$right = $user->user;
dd($right);
return $this->render('about');
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join
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//查询关联表的所有数据
$user = User->find()->with('right')->asArray()->all();
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