--- /dev/null
+<?php
+/**
+ * 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
+ *
+ * @file
+ * @ingroup Database
+ */
+
+namespace Wikimedia\Rdbms;
+
+/**
+ * @ingroup Database
+ */
+class DBQueryError extends DBExpectedError {
+ /** @var string */
+ public $error;
+ /** @var int */
+ public $errno;
+ /** @var string */
+ public $sql;
+ /** @var string */
+ public $fname;
+
+ /**
+ * @param IDatabase $db
+ * @param string $error
+ * @param int|string $errno
+ * @param string $sql
+ * @param string $fname
+ */
+ public function __construct( IDatabase $db, $error, $errno, $sql, $fname ) {
+ if ( $db instanceof Database && $db->wasConnectionError( $errno ) ) {
+ $message = "A connection error occured. \n" .
+ "Query: $sql\n" .
+ "Function: $fname\n" .
+ "Error: $errno $error\n";
+ } else {
+ $message = "A database query error has occurred. Did you forget to run " .
+ "your application's database schema updater after upgrading? \n" .
+ "Query: $sql\n" .
+ "Function: $fname\n" .
+ "Error: $errno $error\n";
+ }
+
+ parent::__construct( $db, $message );
+
+ $this->error = $error;
+ $this->errno = $errno;
+ $this->sql = $sql;
+ $this->fname = $fname;
+ }
+}
+
+class_alias( DBQueryError::class, 'DBQueryError' );