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diff --git a/www/wiki/includes/dao/DBAccessBase.php b/www/wiki/includes/dao/DBAccessBase.php
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+<?php
+
+use Wikimedia\Rdbms\IDatabase;
+use Wikimedia\Rdbms\LoadBalancer;
+
+/**
+ * Base class for objects that allow access to other wiki's databases using
+ * the foreign database access mechanism implemented by LBFactoryMulti.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @since 1.21
+ *
+ * @file
+ * @ingroup Database
+ *
+ * @license GNU GPL v2+
+ * @author Daniel Kinzler
+ */
+abstract class DBAccessBase implements IDBAccessObject {
+	/**
+	 * @var string|bool $wiki The target wiki's name. This must be an ID
+	 * that LBFactory can understand.
+	 */
+	protected $wiki = false;
+
+	/**
+	 * @param string|bool $wiki The target wiki's name. This must be an ID
+	 * that LBFactory can understand.
+	 */
+	public function __construct( $wiki = false ) {
+		$this->wiki = $wiki;
+	}
+
+	/**
+	 * Returns a database connection.
+	 *
+	 * @see wfGetDB()
+	 * @see LoadBalancer::getConnection()
+	 *
+	 * @since 1.21
+	 *
+	 * @param int $id Which connection to use
+	 * @param array $groups Query groups
+	 *
+	 * @return IDatabase
+	 */
+	protected function getConnection( $id, $groups = [] ) {
+		$loadBalancer = wfGetLB( $this->wiki );
+
+		return $loadBalancer->getConnection( $id, $groups, $this->wiki );
+	}
+
+	/**
+	 * Releases a database connection and makes it available for recycling.
+	 *
+	 * @see LoadBalancer::reuseConnection()
+	 *
+	 * @since 1.21
+	 *
+	 * @param IDatabase $db The database connection to release.
+	 */
+	protected function releaseConnection( IDatabase $db ) {
+		if ( $this->wiki !== false ) {
+			$loadBalancer = $this->getLoadBalancer();
+			$loadBalancer->reuseConnection( $db );
+		}
+	}
+
+	/**
+	 * Get the database type used for read operations.
+	 *
+	 * @see wfGetLB
+	 *
+	 * @since 1.21
+	 *
+	 * @return LoadBalancer The database load balancer object
+	 */
+	public function getLoadBalancer() {
+		return wfGetLB( $this->wiki );
+	}
+}