So rufen Sie Direct SQL-Abfragen auf und schließen sich der Sammlung in Magento2 an

Ich möchte nur die direkte SQL-Abfrage in Magento2 wie in magento1.x aufrufen

In Ihren Block- oder Modelldateien müssen Sie die Ressource initialisieren und anschließend die Verbindung aufrufen

das ist

protected $_resource;

und

public function __construct(
    \Magento\Backend\Block\Template\Context $context,
    \Magento\Framework\App\Resource $resource,
    array $data = []
) {
    $this->_resource = $resource;
    parent::__construct($context, $data);
}

für den Anschluss

protected function getConnection()
{
    if (!$this->connection) {
        $this->connection = $this->_resource->getConnection('core_write');
    }

    return $this->connection;
}

Unten ist ein Beispiel in einer Blockdatei

<?php
/**pradeep.kumarrcs67@gmail.com*/
namespace Sugarcode\Test\Block;

class Joinex extends \Magento\Framework\View\Element\Template
{
    protected $_coreRegistry = null;
    protected $_orderCollectionFactory = null;
    protected $connection;
    protected $_resource;

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\App\Resource $resource,
        \Magento\Sales\Model\Resource\Order\CollectionFactory $orderCollectionFactory,
        array $data = []
    ) {
        $this->_orderCollectionFactory = $orderCollectionFactory;
        $this->_coreRegistry = $registry;
        $this->_resource = $resource;
        parent::__construct($context, $data);
    }



    public function _prepareLayout()
    {
        return parent::_prepareLayout();
    }

    protected function getConnection()
    {
        if (!$this->connection) {
            $this->connection = $this->_resource->getConnection('core_write');
        }
        return $this->connection;
    }

    public function getDirectQuery()
    {
        $table=$this->_resource->getTableName('catalog_product_entity'); 
        $sku = $this->getConnection()->fetchRow('SELECT sku,entity_id FROM ' . $table);
        return $sku;
    }

    public function getJoinLeft()
    {
          $orders = $this->_orderCollectionFactory->create();
          $orders->getSelect()->joinLeft(
            ['oce' => 'customer_entity'],
            "main_table.customer_id = oce.entity_id",
            [   
                'CONCAT(oce.firstname," ", oce.lastname) as customer_name',
                'oce.firstname',
                'oce.lastname',
                'oce.email'
            ]
        );

        //$orders->getSelect()->__toString(); $orders->printlogquery(true); exit;
        return $orders; 
    }
}

Sie haben einen alten Aufruf für die Beta-Version von core_write verwendet und core_read in rc sieht folgendermaßen aus:

 protected  _resource;
  public function __construct(Context $context,
\Magento\Framework\App\ResourceConnection $resource)
  {
    $this->_resource = $resource;
    parent::__construct($context);

  }

Adapter erhalten:

$connection = $this->_resource->getConnection(\Magento\Framework\App\ResourceConnection::DEFAULT_CONNECTION);

Tisch holen und auswählen:

$tblSalesOrder = $connection->getTableName('sales_order');
$result1 = $connection->fetchAll('SELECT quote_id FROM `'.$tblSalesOrder.'` WHERE entity_id='.$orderId);

kompletter Kurs von hier

Ich habe dies auf folgende Weise erreicht. Ich habe eine benutzerdefinierte Datei, in der ich ein Objekt davon erstelle, und es hat funktioniert. Überprüfen Sie es einmal.

class Sample extends \Magento\Framework\App\Http implements \Magento\Framework\AppInterface
{

    public function sampleMethod()
    {
        $connection = $this->_objectManager->create('\Magento\Framework\App\ResourceConnection');
        $conn = $connection->getConnection();
        $select = $conn->select()
            ->from(
                ['o' => 'catalog_category_entity_varchar']
            )
            ->where('o.value=?', '2');
        $data = $conn->fetchAll($select);
        print_r($data);
    }

}

Versuchen Sie und lassen Sie mich wissen, ob es für Sie funktioniert.

Funktioniert bei mir nicht :(

Hier ist meine Blockdatei:

<?php
namespace Silver\Customize\Block;
use \Magento\Framework\View\Element\Template;

class Main extends Template
{    

    protected $connection;
    protected $_resource; 

    public function __construct(
        \Magento\Backend\Block\Template\Context $context,
        \Magento\Framework\App\Resource $resource
    ) {
        $this->_resource = $resource;
        parent::__construct($context, $data);
    }  


    protected function _prepareLayout()
    {
    $this->setMessage('Hello');
    $this->setName($this->getRequest()->getParam('name'));    

    }

    public function getGoodbyeMessage()
{
    return 'Goodbye World';
}

    protected function getConnection()
    {
        if (!$this->connection) {
            $this->connection = $this->_resource->getConnection('core_write');
        }
        return $this->connection;
    } 

}

Ich erhalte diesen Fehler: Objekt DOMDocument sollte erstellt werden.

Was vermisse ich?

For Join Query,
   protected $_objectManager; 
   public function __construct(
        \Magento\Framework\ObjectManagerInterface $objectManager,
        \Test\Vendor\Model\ResourceModel\Vendor $resourceModel
    ) {
        $this->resourceModel = $resourceModel;
        $this->_objectManager = $objectManager;
    }

$collection = $this->_objectManager->create('Test\Vendor\Model\Vendor')->getCollection();
$vendor_id = 5; //get dynamic vendor id
        $collection->getSelect()->join('secondTableName as s2','main_table.entity_id = s2.vendor_id', array('*'))->where("main_table.entity_id = ".$vendor_id);

Probier diese :

    //for print log on custom log file.


    $writer = new \Zend\Log\Writer\Stream(BP . '/var/log/mylog.log');
    $logger = new \Zend\Log\Logger();
    $logger->addWriter($writer);
    $logger->info('Query cron  srarting...: ');
    try{
        $themeId=273;
        $this->_resources = \Magento\Framework\App\ObjectManager::getInstance()
        ->get('Magento\Framework\App\ResourceConnection');
        $connection= $this->_resources->getConnection();

        $negotiateTable = $this->_resources->getTableName('table_name');
        $sql = "Select * FROM " . $negotiateTable;//". WHERE id = " . $themeId . ";";
        $result = $connection->fetchAll($sql);
        foreach ($result as $item){
            $logger->info('Query cron  query data...: '.json_encode($item));
        }

    }catch (\Exception $e){
        $logger->info('Query cron  query data exception'.$e->getMessage());
    }

<?php 

 $objectManager = \Magento\Framework\App\ObjectManager::getInstance(); 
 $resource = $objectManager->get('Magento\Framework\App\ResourceConnection');
 $connection = $resource->getConnection();
 $tableName = $resource->getTableName('table_name');
 $attribute_information = "Select * FROM " . $tableName; //check for the  custom attribute condition". WHERE id = " . $manufacture . ";";
// fetchOne it return the one value
$result = $connection->fetchOne($attribute_information); ?>