【发布时间】：2019-01-28 09:46:15
【问题描述】：
我正在尝试切换到并在我创建的自定义 Drupal 8 模块中查询外部数据库。
我在settings.php中的本机数据库下面添加了外部数据库：
// 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，我在其中对数据库进行查询：
<?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 类已注册为服务，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 }
此代码有效，直到我尝试取消注释 Database::setActiveConnection('external');
然后我收到以下错误：
网站遇到意外错误。请稍后再试。Drupal\Core\Database\DatabaseExceptionWrapper: SQLSTATE[42S02]: Base table or view not found: 1146 Table '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;大批 ( [:db_condition_placeholder_0] => 1 )
看起来开关正在工作，但 Drupal 可能正在尝试使用外部数据库来实现其本机功能？我知道我也必须在某个时候切换回默认数据库，但我不确定在哪里执行此操作？
任何帮助或建议将不胜感激。亲切的问候，马特
【问题讨论】：