yii框架数据库关联查询操作示例

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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