Proper way of re-using and passing multiple queries in yii2 - php

Question

My website has Object as the model and ObjectSearch as the searchModel. I realized that I am already having a lot of duplicates in my two different controllers. For example, FirstController has this:
$arr = Yii::$app->db->createCommand('SELECT id, name, address
FROM hosts)->queryAll();
Then at some part of my website SecondController also needs to use that same query.
How can I re-use that query over and over again from different controllers?
I am talking about this:
public function search($params)
{
$query = Host::find();
$dataProvider = new ActiveDataProvider([
'query' => $query,
]
]);
.
.
.
return $dataProvider;
}
I have another question also. I am planning to do different queries. What is the best approach for making another query? Should I use that
public function search($params)
again and maybe add on the parameter like this?
public function search($params, $cond)
{
if ($cond == true) {
$query = *something;
}
else {
$query = *something_else;
}
.
.
.
return $dataProvider;
}

Answer 1

In your root folder, you are having component folder. Inside component folder, create one page like UserInfoComponent.php. This page will be common and can be use anywhere.
This is the Directory Structure
YourProjectFolder
->assets
->commands
->components
->UserInfoComponent.php
.
.
UserInfoComponent.php
<?php
namespace app\components;
use Yii;
use yii\base\Component;
class UserInfoComponent extends Component
{
.
.
public function getUserDetails() {
$arr = Yii::$app->db->createCommand('SELECT id, name, address FROM hosts')->queryAll();
return $arr;
}
.
.
.
}
Now, how to call this function in your controller or view.
Controller or view
<?
$arrValue = Yii::$app->userinfo->getUserDetails();
?>

Answer 2

For common function you can create an helper class
namespace myapp\myhelperdir
class MyQueryHelper
{
public static function mySelectFunction ($param)
{
// your code for function
return $yourResult;
}
then you can refer to these function in every part of your project simply adding
use myapp\myhelperdir\MyQueryHelper
$myResult = MyQueryHelper::mySelectFunction($myParam);