Question

我正在尝试在我创建的自定义Drupal 8模块中切换并查询外部数据库。

我已在 settings.php 中将外部数据库添加到本机数据库下面：

// 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',
);

然后我有一个名为 BusinessListingDbLogic.php 的文件，我在其中查询数据库：

<?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类被注册为服务，我的 business_listing.services.yml 看起来如下：

 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 }

此代码有效，直到我尝试取消注释Database::setActiveConnection('external'); 然后，我得到以下错误：

网站遇到意外错误。请稍后再试。Drupal \ Core \ Database \ DatabaseExceptionWrapper：SQLSTATE [42S02]：找不到基表或视图：1146表'uconomy_external.shortcut_set_users'不存在：SELECT ssu.set_name AS set_name 从 {shortcut_set_users} ssu WHERE ssu.uid =：db_condition_placeholder_0;数组（ [：db_condition_placeholder_0] => 1 ）

开关似乎可以正常工作，但是Drupal可能正在尝试使用外部数据库来实现其本机功能？我知道我有时也必须切换回默认数据库，但是我不确定该在哪里做？

任何帮助或建议将不胜感激。亲切的问候，马特

Answer 1

似乎需要直接使用静态方法Database::setActiveConnection()来代替调用当前连接来进行设置。

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

Drupal 8-如何在自定义模块中切换到外部数据库？

1 个答案: