Drupal 8-如何在自定義模塊中切換到外部數據庫？

Question

我試圖在我創建的自定義Drupal 8模塊中切換並查詢外部數據庫。

我在settings.php的本地數據庫下面添加了外部數據庫：

// Add second database

$databases['external']['default'] = array(
  'database' => 'uconomy_external',
  'username' => 'uconomy_admin',
  'password' => 'fNjA9kC35h8',
  'prefix' => '',
  'host' => 'localhost',
  'port' => '3306',
  'namespace' => 'Drupal\\Core\\Database\\Driver\\mysql',
  'driver' => 'mysql',
);

然后，我有一個名為BusinessListingDbLogic.php的文件，在其中對數據庫進行查詢：

<?php

namespace Drupal\business_listing;

use Drupal\Core\Database\Connection;
use Drupal\Core\Database\Database;

/**
* Defines a storage handler class that handles the node grants system.
*
* This is used to build node query access.
* 
* This class contains all the logic for interacting with our database 
* 
* @ingroup business_listing
*/
class BusinessListingDbLogic {

 /**
  * @var \Drupal\Core\Database\Connection
  */   
 protected $database;

     /**
     * @param \Drupal\Core\Database\Connection $connection
     */
 public function __construct(Connection $connection) {

   $this->database = $connection;
   //Database::setActiveConnection('external');

 }

 /**
  * Add new record in table business_listing.
  */
 public function add($title, $body, $imageName, $location, $email) {
   if (empty($title) || empty($body) || empty($imageName) || empty($location) || empty($email)) {
    return FALSE;
   }
   // add record to business_listing table in database.
   $query = $this->database->insert('business_listing');
   $query->fields(array(
    'title' => $title,
    'body' => $body,
    'image' => $imageName,
    'location' => $location,
    'email' => $email
   ));
   return $query->execute();
 }

我相信我的BusinessListingDbLogic類已注冊為服務，我的business_listing.services.yml如下所示：

 services:
 # Service Name.
 business_listing.database.external:
   class: Drupal\Core\Database\Connection
   factory: 'Drupal\Core\Database\Database::getConnection'
   arguments: ['external']

 # external database dependent serivce.
 business_listing.db_logic:
   # Class that renders the service.
   # BusinessListingDbLogic contains all the functions we use to interact with the business_listings table
   class: Drupal\business_listing\BusinessListingDbLogic
   # Arguments that will come to the class constructor.
   arguments: ['@business_listing.database.external']
   # A more detailed explanation: https://www.drupal.org/node/2239393.
#   tags:
#    - { name: backend_overridable }

在我嘗試取消注釋Database::setActiveConnection('external');之前，此代碼一直有效Database::setActiveConnection('external'); 然后，我得到以下錯誤：

該網站遇到意外錯誤。 請稍后再試。Drupal \\ Core \\ Database \\ DatabaseExceptionWrapper：SQLSTATE [42S02]：找不到基表或視圖：1146表'uconomy_external.shortcut_set_users'不存在：SELECT ssu.set_name AS set_name FROM {shortcut_set_users} ssu WHERE ssu .uid =：db_condition_placeholder_0; 數組（[：db_condition_placeholder_0] => 1）

開關似乎工作正常，但是Drupal可能正在嘗試使用外部數據庫來實現其本機功能？ 我知道我有時也必須切換回默認數據庫，但是我不確定該在哪里進行？

任何幫助或建議將不勝感激。 親切的問候，馬特

Answer 1

似乎需要調用靜態方法Database::setActiveConnection()來代替調用當前連接來進行設置。

例如。 $this->database->setActiveConnection('external')變為Database::setActiveConnection('external')