本文实例讲述了yii框架数据库关联查询操作。分享给大家供大家参考,具体如下:
<?php namespace app\controllers; use yii\web\Controller; use app\models\Customer; class CustomerController extends Controller{ //根据顾客名字查询出所有的订单信息 public function actionIndex(){ $customer = Customer::find()->where(['name'=>'zhangsan'])->one(); $orders = $customer->hasMany('app\models\Order',['customer_id'=>'id'])->asArray()->all(); print_r($orders); } } ?>
上边的控制器方法查询,Customer模型没有具体方法。
上边的 app\models\Order 可以改进为Order::className()
,并且上边要添加use app\models\Order;
方式二:(使用model方法)
customer模型代码:
<?php namespace app\models; use yii\db\ActiveRecord; class Customer extends ActiveRecord{ public function getOrders(){ return $this->hasMany(Order::className(),['customer_id'=>'id'])->asArray()->all(); } }
控制器代码:
namespace app\controllers; use yii\web\Controller; use app\models\Customer; class CustomerController extends Controller{ //根据顾客名字查询出所有的订单信息 public function actionIndex(){ $customer = Customer::find()->where(['name'=>'zhangsan'])->one(); $orders = $customer->getOrders(); print_r($orders); } }
方法三:(调用模型的属性查询)
customer模型代码:
namespace app\models; use yii\db\ActiveRecord; class Customer extends ActiveRecord{ public function getOrders(){ return $this->hasMany(Order::className(),['customer_id'=>'id'])->asArray(); } }
控制器代码:
namespace app\controllers; use yii\web\Controller; use app\models\Customer; class CustomerController extends Controller{ //根据顾客名字查询出所有的订单信息 public function actionIndex(){ $customer = Customer::find()->where(['name'=>'zhangsan'])->one(); $orders = $customer->orders; //说明,当调用一个不存在的属性时, //php会去调用一个__get()的方法, //__get()的方法会自动调用一个get+属性的方法,即getOrders() //并且会再查询时自动补上->all()或->one()方法,根据模型查询的hasMany或hasOne决定的 print_r($orders); } }
根据订单id获取对应的顾客信息:
模型代码:
namespace app\models; use yii\db\ActiveRecord; class Order extends ActiveRecord{ //根据订单id获取顾客信息 public function getCustomer(){ return $this->hasOne(Customer::className(),['id'=>'customer_id'])->asArray(); } }
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