YII2.0 查询生成器-数据库访问

<?php

namespace app\controllers;

use yii;
use yii\web\Controller;
use yii\db\Query;

class DataController extends Controller
{

public function actionIndex()
{
// 数据查询
// 使用表前缀查询{{%table}}
//        $result = Yii::$app->getDb()->createCommand("SELECT COUNT([[id]]) FROM {{%user}}")->queryScalar();

// 查询多条语句
$result = Yii::$app->getDb()->createCommand('select * from {{user}}')->queryAll();
// 查询一条语句
$id = 'xxx';
$result2 = Yii::$app->getDb()->createCommand("select * from  {{user}} where id  =:id")->bindValue('id', $id)->queryOne();

var_dump($result);die;
}
public function actionInsert()
{
// 单条数据插入 成功返回1
Yii::$app->getDb()->createCommand()->insert('user', [
'name' => 'yanglu',
'email' => '619508448@qq.com',
'address' => '广东'
])->execute();

}

//批量插入数据
public function actionBatch()
{
$res = Yii::$app->getDb()->createCommand()->dropTable('user1')->execute();
// 成功返回插入记录的数量和
$result = Yii::$app->getDb()->createCommand()->batchInsert('user',['name', 'email', 'address'], [
['张三, "6194@qq.com", '深圳'],
['李四', "4170@qq.com", '深圳'],
['王五', "542@qq,com", '北京'],
])->execute();
}

// 查询构建器
public function actionSelect()
{
$query = new \yii\db\Query();
$rows = $query->select('id as userId, name, email, address as addr')->from('user')->where(['name' => 'name'])->limit(10)->all();
$rows2 = $query->select(['user.id as user_id', 'user.name', 'user.email', 'user.address as addr'])->from('user')->where(['name' => '杨利'])->limit(10)->all();

$rows3 = $query->select('id, name, email')->from('user')->where(['like', 'name', 'xxx'])->limit(100)->all();

$rows4 = (new Query())->select('id')->from('user');
$rows5 = $query->from('user')->where(['id' => $rows4])->all();

$rows6 = (new Query())->from('user')->where(['and', 'name="name..."',  'email = "61950844@qq.com"', 'address="xxxx"'])->orderBy('id desc')->all();
$rows7 = (new Query())->from('user')->groupBy('id')->indexBy(function ($row){
return $row['id'] . '_' . $row['name'];
})->orderBy('id desc');

foreach ($rows7->batch() as $batch) {
var_dump($batch);die;
}

var_dump($rows7);

}
}