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：

use appmodelsUser;
$right = Right::findOne(2);
//$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：

modelsRught.php

namespace appmodels;
use yiidbActiveRecord;
class Right extends ActiveRecord
{
  public function getUsers()
  {
    $users = $this- hasMany(User::className(),['right_id' =  'id'])- asArray()p- all();
    return $users;
  }
}

controllerhomeactionAbout

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

modelsUser.php

namespace appmodels;
use yiidbActiveRecord;
class User extends ActiveRecord
{
  public function getRight()
  {
    $right = $this- hasOne(Right::className,['id' =  'right_id'])- asArray();
    return $right;
  }
}

controllerhomeactionAbout

$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();