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[lhc/web/wiklou.git] / includes / libs / rdbms / database / DatabaseMssql.php
1 <?php
2 /**
3 * This is the MS SQL Server Native database abstraction layer.
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18 * http://www.gnu.org/copyleft/gpl.html
19 *
20 * @file
21 * @ingroup Database
22 * @author Joel Penner <a-joelpe at microsoft dot com>
23 * @author Chris Pucci <a-cpucci at microsoft dot com>
24 * @author Ryan Biesemeyer <v-ryanbi at microsoft dot com>
25 * @author Ryan Schmidt <skizzerz at gmail dot com>
26 */
27
28 namespace Wikimedia\Rdbms;
29
30 use Exception;
31 use RuntimeException;
32 use stdClass;
33 use Wikimedia\AtEase\AtEase;
34
35 /**
36 * @ingroup Database
37 */
38 class DatabaseMssql extends Database {
39 /** @var int */
40 protected $serverPort;
41 /** @var bool */
42 protected $useWindowsAuth = false;
43 /** @var int|null */
44 protected $lastInsertId = null;
45 /** @var int|null */
46 protected $lastAffectedRowCount = null;
47 /** @var int */
48 protected $subqueryId = 0;
49 /** @var bool */
50 protected $scrollableCursor = true;
51 /** @var bool */
52 protected $prepareStatements = true;
53 /** @var stdClass[][]|null */
54 protected $binaryColumnCache = null;
55 /** @var stdClass[][]|null */
56 protected $bitColumnCache = null;
57 /** @var bool */
58 protected $ignoreDupKeyErrors = false;
59 /** @var string[] */
60 protected $ignoreErrors = [];
61
62 public function implicitGroupby() {
63 return false;
64 }
65
66 public function implicitOrderby() {
67 return false;
68 }
69
70 public function unionSupportsOrderAndLimit() {
71 return false;
72 }
73
74 public function __construct( array $params ) {
75 $this->serverPort = $params['port'];
76 $this->useWindowsAuth = $params['UseWindowsAuth'];
77
78 parent::__construct( $params );
79 }
80
81 protected function open( $server, $user, $password, $dbName, $schema, $tablePrefix ) {
82 if ( !function_exists( 'sqlsrv_connect' ) ) {
83 throw new DBConnectionError(
84 $this,
85 "Microsoft SQL Server Native (sqlsrv) functions missing.\n
86 You can download the driver from: http://go.microsoft.com/fwlink/?LinkId=123470"
87 );
88 }
89
90 $this->close();
91
92 if ( $schema !== null ) {
93 throw $this->newExceptionAfterConnectError( "Got schema '$schema'; not supported." );
94 }
95
96 $this->server = $server;
97 $this->user = $user;
98 $this->password = $password;
99
100 $connectionInfo = [];
101 if ( strlen( $dbName ) ) {
102 $connectionInfo['Database'] = $dbName;
103 }
104 if ( !$this->useWindowsAuth ) {
105 $connectionInfo['UID'] = $user;
106 $connectionInfo['PWD'] = $password;
107 }
108
109 AtEase::suppressWarnings();
110 $this->conn = sqlsrv_connect( $server, $connectionInfo ) ?: null;
111 AtEase::restoreWarnings();
112
113 if ( !$this->conn ) {
114 throw $this->newExceptionAfterConnectError( $this->lastError() );
115 }
116
117 try {
118 $this->currentDomain = new DatabaseDomain(
119 strlen( $dbName ) ? $dbName : null,
120 null,
121 $tablePrefix
122 );
123 } catch ( Exception $e ) {
124 throw $this->newExceptionAfterConnectError( $e->getMessage() );
125 }
126 }
127
128 /**
129 * Closes a database connection, if it is open
130 * Returns success, true if already closed
131 * @return bool
132 */
133 protected function closeConnection() {
134 return sqlsrv_close( $this->conn );
135 }
136
137 /**
138 * @param bool|MssqlResultWrapper|resource $result
139 * @return bool|MssqlResultWrapper
140 */
141 protected function resultObject( $result ) {
142 if ( !$result ) {
143 return false;
144 } elseif ( $result instanceof MssqlResultWrapper ) {
145 return $result;
146 } elseif ( $result === true ) {
147 // Successful write query
148 return $result;
149 } else {
150 return new MssqlResultWrapper( $this, $result );
151 }
152 }
153
154 /**
155 * @param string $sql
156 * @return bool|MssqlResultWrapper|resource
157 */
158 protected function doQuery( $sql ) {
159 // several extensions seem to think that all databases support limits
160 // via LIMIT N after the WHERE clause, but MSSQL uses SELECT TOP N,
161 // so to catch any of those extensions we'll do a quick check for a
162 // LIMIT clause and pass $sql through $this->LimitToTopN() which parses
163 // the LIMIT clause and passes the result to $this->limitResult();
164 if ( preg_match( '/\bLIMIT\s*/i', $sql ) ) {
165 // massage LIMIT -> TopN
166 $sql = $this->LimitToTopN( $sql );
167 }
168
169 // MSSQL doesn't have EXTRACT(epoch FROM XXX)
170 if ( preg_match( '#\bEXTRACT\s*?\(\s*?EPOCH\s+FROM\b#i', $sql, $matches ) ) {
171 // This is same as UNIX_TIMESTAMP, we need to calc # of seconds from 1970
172 $sql = str_replace( $matches[0], "DATEDIFF(s,CONVERT(datetime,'1/1/1970'),", $sql );
173 }
174
175 // perform query
176
177 // SQLSRV_CURSOR_STATIC is slower than SQLSRV_CURSOR_CLIENT_BUFFERED (one of the two is
178 // needed if we want to be able to seek around the result set), however CLIENT_BUFFERED
179 // has a bug in the sqlsrv driver where wchar_t types (such as nvarchar) that are empty
180 // strings make php throw a fatal error "Severe error translating Unicode"
181 if ( $this->scrollableCursor ) {
182 $scrollArr = [ 'Scrollable' => SQLSRV_CURSOR_STATIC ];
183 } else {
184 $scrollArr = [];
185 }
186
187 if ( $this->prepareStatements ) {
188 // we do prepare + execute so we can get its field metadata for later usage if desired
189 $stmt = sqlsrv_prepare( $this->conn, $sql, [], $scrollArr );
190 $success = sqlsrv_execute( $stmt );
191 } else {
192 $stmt = sqlsrv_query( $this->conn, $sql, [], $scrollArr );
193 $success = (bool)$stmt;
194 }
195
196 // Make a copy to ensure what we add below does not get reflected in future queries
197 $ignoreErrors = $this->ignoreErrors;
198
199 if ( $this->ignoreDupKeyErrors ) {
200 // ignore duplicate key errors
201 // this emulates INSERT IGNORE in MySQL
202 $ignoreErrors[] = '2601'; // duplicate key error caused by unique index
203 $ignoreErrors[] = '2627'; // duplicate key error caused by primary key
204 $ignoreErrors[] = '3621'; // generic "the statement has been terminated" error
205 }
206
207 if ( $success === false ) {
208 $errors = sqlsrv_errors();
209 $success = true;
210
211 foreach ( $errors as $err ) {
212 if ( !in_array( $err['code'], $ignoreErrors ) ) {
213 $success = false;
214 break;
215 }
216 }
217
218 if ( $success === false ) {
219 return false;
220 }
221 }
222 // remember number of rows affected
223 $this->lastAffectedRowCount = sqlsrv_rows_affected( $stmt );
224
225 return $stmt;
226 }
227
228 public function freeResult( $res ) {
229 sqlsrv_free_stmt( ResultWrapper::unwrap( $res ) );
230 }
231
232 /**
233 * @param IResultWrapper $res
234 * @return stdClass
235 */
236 public function fetchObject( $res ) {
237 // $res is expected to be an instance of MssqlResultWrapper here
238 return $res->fetchObject();
239 }
240
241 /**
242 * @param IResultWrapper $res
243 * @return array
244 */
245 public function fetchRow( $res ) {
246 return $res->fetchRow();
247 }
248
249 /**
250 * @param mixed $res
251 * @return int
252 */
253 public function numRows( $res ) {
254 $res = ResultWrapper::unwrap( $res );
255
256 $ret = sqlsrv_num_rows( $res );
257 if ( $ret === false ) {
258 // we cannot get an amount of rows from this cursor type
259 // has_rows returns bool true/false if the result has rows
260 $ret = (int)sqlsrv_has_rows( $res );
261 }
262
263 return $ret;
264 }
265
266 /**
267 * @param mixed $res
268 * @return int
269 */
270 public function numFields( $res ) {
271 return sqlsrv_num_fields( ResultWrapper::unwrap( $res ) );
272 }
273
274 /**
275 * @param mixed $res
276 * @param int $n
277 * @return int
278 */
279 public function fieldName( $res, $n ) {
280 return sqlsrv_field_metadata( ResultWrapper::unwrap( $res ) )[$n]['Name'];
281 }
282
283 /**
284 * This must be called after nextSequenceVal
285 * @return int|null
286 */
287 public function insertId() {
288 return $this->lastInsertId;
289 }
290
291 /**
292 * @param MssqlResultWrapper $res
293 * @param int $row
294 * @return bool
295 */
296 public function dataSeek( $res, $row ) {
297 return $res->seek( $row );
298 }
299
300 /**
301 * @return string
302 */
303 public function lastError() {
304 $strRet = '';
305 $retErrors = sqlsrv_errors( SQLSRV_ERR_ALL );
306 if ( $retErrors != null ) {
307 foreach ( $retErrors as $arrError ) {
308 $strRet .= $this->formatError( $arrError ) . "\n";
309 }
310 } else {
311 $strRet = "No errors found";
312 }
313
314 return $strRet;
315 }
316
317 /**
318 * @param array $err
319 * @return string
320 */
321 private function formatError( $err ) {
322 return '[SQLSTATE ' .
323 $err['SQLSTATE'] . '][Error Code ' . $err['code'] . ']' . $err['message'];
324 }
325
326 /**
327 * @return string|int
328 */
329 public function lastErrno() {
330 $err = sqlsrv_errors( SQLSRV_ERR_ALL );
331 if ( $err !== null && isset( $err[0] ) ) {
332 return $err[0]['code'];
333 } else {
334 return 0;
335 }
336 }
337
338 protected function wasKnownStatementRollbackError() {
339 $errors = sqlsrv_errors( SQLSRV_ERR_ALL );
340 if ( !$errors ) {
341 return false;
342 }
343 // The transaction vs statement rollback behavior depends on XACT_ABORT, so make sure
344 // that the "statement has been terminated" error (3621) is specifically present.
345 // https://docs.microsoft.com/en-us/sql/t-sql/statements/set-xact-abort-transact-sql
346 $statementOnly = false;
347 $codeWhitelist = [ '2601', '2627', '547' ];
348 foreach ( $errors as $error ) {
349 if ( $error['code'] == '3621' ) {
350 $statementOnly = true;
351 } elseif ( !in_array( $error['code'], $codeWhitelist ) ) {
352 $statementOnly = false;
353 break;
354 }
355 }
356
357 return $statementOnly;
358 }
359
360 public function serverIsReadOnly() {
361 $encDatabase = $this->addQuotes( $this->getDBname() );
362 $res = $this->query(
363 "SELECT IS_READ_ONLY FROM SYS.DATABASES WHERE NAME = $encDatabase",
364 __METHOD__
365 );
366 $row = $this->fetchObject( $res );
367
368 return $row ? (bool)$row->IS_READ_ONLY : false;
369 }
370
371 /**
372 * @return int
373 */
374 protected function fetchAffectedRowCount() {
375 return $this->lastAffectedRowCount;
376 }
377
378 /**
379 * SELECT wrapper
380 *
381 * @param mixed $table Array or string, table name(s) (prefix auto-added)
382 * @param mixed $vars Array or string, field name(s) to be retrieved
383 * @param mixed $conds Array or string, condition(s) for WHERE
384 * @param string $fname Calling function name (use __METHOD__) for logs/profiling
385 * @param array $options Associative array of options (e.g.
386 * [ 'GROUP BY' => 'page_title' ]), see Database::makeSelectOptions
387 * code for list of supported stuff
388 * @param array $join_conds Associative array of table join conditions
389 * (optional) (e.g. [ 'page' => [ 'LEFT JOIN','page_latest=rev_id' ] ]
390 * @return mixed Database result resource (feed to Database::fetchObject
391 * or whatever), or false on failure
392 * @throws DBQueryError
393 * @throws DBUnexpectedError
394 * @throws Exception
395 */
396 public function select( $table, $vars, $conds = '', $fname = __METHOD__,
397 $options = [], $join_conds = []
398 ) {
399 $sql = $this->selectSQLText( $table, $vars, $conds, $fname, $options, $join_conds );
400 if ( isset( $options['EXPLAIN'] ) ) {
401 try {
402 $this->scrollableCursor = false;
403 $this->prepareStatements = false;
404 $this->query( "SET SHOWPLAN_ALL ON" );
405 $ret = $this->query( $sql, $fname );
406 $this->query( "SET SHOWPLAN_ALL OFF" );
407 } catch ( DBQueryError $dqe ) {
408 if ( isset( $options['FOR COUNT'] ) ) {
409 // likely don't have privs for SHOWPLAN, so run a select count instead
410 $this->query( "SET SHOWPLAN_ALL OFF" );
411 unset( $options['EXPLAIN'] );
412 $ret = $this->select(
413 $table,
414 'COUNT(*) AS EstimateRows',
415 $conds,
416 $fname,
417 $options,
418 $join_conds
419 );
420 } else {
421 // someone actually wanted the query plan instead of an est row count
422 // let them know of the error
423 $this->scrollableCursor = true;
424 $this->prepareStatements = true;
425 throw $dqe;
426 }
427 }
428 $this->scrollableCursor = true;
429 $this->prepareStatements = true;
430 return $ret;
431 }
432 return $this->query( $sql, $fname );
433 }
434
435 /**
436 * SELECT wrapper
437 *
438 * @param mixed $table Array or string, table name(s) (prefix auto-added)
439 * @param mixed $vars Array or string, field name(s) to be retrieved
440 * @param mixed $conds Array or string, condition(s) for WHERE
441 * @param string $fname Calling function name (use __METHOD__) for logs/profiling
442 * @param array $options Associative array of options (e.g. [ 'GROUP BY' => 'page_title' ]),
443 * see Database::makeSelectOptions code for list of supported stuff
444 * @param array $join_conds Associative array of table join conditions (optional)
445 * (e.g. [ 'page' => [ 'LEFT JOIN','page_latest=rev_id' ] ]
446 * @return string The SQL text
447 */
448 public function selectSQLText( $table, $vars, $conds = '', $fname = __METHOD__,
449 $options = [], $join_conds = []
450 ) {
451 if ( isset( $options['EXPLAIN'] ) ) {
452 unset( $options['EXPLAIN'] );
453 }
454
455 $sql = parent::selectSQLText( $table, $vars, $conds, $fname, $options, $join_conds );
456
457 // try to rewrite aggregations of bit columns (currently MAX and MIN)
458 if ( strpos( $sql, 'MAX(' ) !== false || strpos( $sql, 'MIN(' ) !== false ) {
459 $bitColumns = [];
460 if ( is_array( $table ) ) {
461 $tables = $table;
462 while ( $tables ) {
463 $t = array_pop( $tables );
464 if ( is_array( $t ) ) {
465 $tables = array_merge( $tables, $t );
466 } else {
467 $bitColumns += $this->getBitColumns( $this->tableName( $t ) );
468 }
469 }
470 } else {
471 $bitColumns = $this->getBitColumns( $this->tableName( $table ) );
472 }
473
474 foreach ( $bitColumns as $col => $info ) {
475 $replace = [
476 "MAX({$col})" => "MAX(CAST({$col} AS tinyint))",
477 "MIN({$col})" => "MIN(CAST({$col} AS tinyint))",
478 ];
479 $sql = str_replace( array_keys( $replace ), array_values( $replace ), $sql );
480 }
481 }
482
483 return $sql;
484 }
485
486 public function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds,
487 $fname = __METHOD__
488 ) {
489 $this->scrollableCursor = false;
490 try {
491 parent::deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname );
492 } catch ( Exception $e ) {
493 $this->scrollableCursor = true;
494 throw $e;
495 }
496 $this->scrollableCursor = true;
497 }
498
499 public function delete( $table, $conds, $fname = __METHOD__ ) {
500 $this->scrollableCursor = false;
501 try {
502 parent::delete( $table, $conds, $fname );
503 } catch ( Exception $e ) {
504 $this->scrollableCursor = true;
505 throw $e;
506 }
507 $this->scrollableCursor = true;
508
509 return true;
510 }
511
512 /**
513 * Estimate rows in dataset
514 * Returns estimated count, based on SHOWPLAN_ALL output
515 * This is not necessarily an accurate estimate, so use sparingly
516 * Returns -1 if count cannot be found
517 * Takes same arguments as Database::select()
518 * @param string $table
519 * @param string $var
520 * @param string $conds
521 * @param string $fname
522 * @param array $options
523 * @param array $join_conds
524 * @return int
525 */
526 public function estimateRowCount( $table, $var = '*', $conds = '',
527 $fname = __METHOD__, $options = [], $join_conds = []
528 ) {
529 $conds = $this->normalizeConditions( $conds, $fname );
530 $column = $this->extractSingleFieldFromList( $var );
531 if ( is_string( $column ) && !in_array( $column, [ '*', '1' ] ) ) {
532 $conds[] = "$column IS NOT NULL";
533 }
534
535 // http://msdn2.microsoft.com/en-us/library/aa259203.aspx
536 $options['EXPLAIN'] = true;
537 $options['FOR COUNT'] = true;
538 $res = $this->select( $table, $var, $conds, $fname, $options, $join_conds );
539
540 $rows = -1;
541 if ( $res ) {
542 $row = $this->fetchRow( $res );
543
544 if ( isset( $row['EstimateRows'] ) ) {
545 $rows = (int)$row['EstimateRows'];
546 }
547 }
548
549 return $rows;
550 }
551
552 /**
553 * Returns information about an index
554 * If errors are explicitly ignored, returns NULL on failure
555 * @param string $table
556 * @param string $index
557 * @param string $fname
558 * @return array|bool|null
559 */
560 public function indexInfo( $table, $index, $fname = __METHOD__ ) {
561 # This does not return the same info as MYSQL would, but that's OK
562 # because MediaWiki never uses the returned value except to check for
563 # the existence of indexes.
564 $sql = "sp_helpindex '" . $this->tableName( $table ) . "'";
565 $res = $this->query( $sql, $fname );
566
567 if ( !$res ) {
568 return null;
569 }
570
571 $result = [];
572 foreach ( $res as $row ) {
573 if ( $row->index_name == $index ) {
574 $row->Non_unique = !stristr( $row->index_description, "unique" );
575 $cols = explode( ", ", $row->index_keys );
576 foreach ( $cols as $col ) {
577 $row->Column_name = trim( $col );
578 $result[] = clone $row;
579 }
580 } elseif ( $index == 'PRIMARY' && stristr( $row->index_description, 'PRIMARY' ) ) {
581 $row->Non_unique = 0;
582 $cols = explode( ", ", $row->index_keys );
583 foreach ( $cols as $col ) {
584 $row->Column_name = trim( $col );
585 $result[] = clone $row;
586 }
587 }
588 }
589
590 return $result ?: false;
591 }
592
593 /**
594 * INSERT wrapper, inserts an array into a table
595 *
596 * $arrToInsert may be a single associative array, or an array of these with numeric keys, for
597 * multi-row insert.
598 *
599 * Usually aborts on failure
600 * If errors are explicitly ignored, returns success
601 * @param string $table
602 * @param array $arrToInsert
603 * @param string $fname
604 * @param array $options
605 * @return bool
606 * @throws Exception
607 */
608 public function insert( $table, $arrToInsert, $fname = __METHOD__, $options = [] ) {
609 # No rows to insert, easy just return now
610 if ( !count( $arrToInsert ) ) {
611 return true;
612 }
613
614 if ( !is_array( $options ) ) {
615 $options = [ $options ];
616 }
617
618 $table = $this->tableName( $table );
619
620 if ( !( isset( $arrToInsert[0] ) && is_array( $arrToInsert[0] ) ) ) { // Not multi row
621 $arrToInsert = [ 0 => $arrToInsert ]; // make everything multi row compatible
622 }
623
624 // We know the table we're inserting into, get its identity column
625 $identity = null;
626 // strip matching square brackets and the db/schema from table name
627 $tableRawArr = explode( '.', preg_replace( '#\[([^\]]*)\]#', '$1', $table ) );
628 $tableRaw = array_pop( $tableRawArr );
629 $res = $this->doQuery(
630 "SELECT NAME AS idColumn FROM SYS.IDENTITY_COLUMNS " .
631 "WHERE OBJECT_NAME(OBJECT_ID)='{$tableRaw}'"
632 );
633 if ( $res && sqlsrv_has_rows( $res ) ) {
634 // There is an identity for this table.
635 $identityArr = sqlsrv_fetch_array( $res, SQLSRV_FETCH_ASSOC );
636 $identity = array_pop( $identityArr );
637 }
638 sqlsrv_free_stmt( $res );
639
640 // Determine binary/varbinary fields so we can encode data as a hex string like 0xABCDEF
641 $binaryColumns = $this->getBinaryColumns( $table );
642
643 // INSERT IGNORE is not supported by SQL Server
644 // remove IGNORE from options list and set ignore flag to true
645 if ( in_array( 'IGNORE', $options ) ) {
646 $options = array_diff( $options, [ 'IGNORE' ] );
647 $this->ignoreDupKeyErrors = true;
648 }
649
650 $ret = null;
651 foreach ( $arrToInsert as $a ) {
652 // start out with empty identity column, this is so we can return
653 // it as a result of the INSERT logic
654 $sqlPre = '';
655 $sqlPost = '';
656 $identityClause = '';
657
658 // if we have an identity column
659 if ( $identity ) {
660 // iterate through
661 foreach ( $a as $k => $v ) {
662 if ( $k == $identity ) {
663 if ( !is_null( $v ) ) {
664 // there is a value being passed to us,
665 // we need to turn on and off inserted identity
666 $sqlPre = "SET IDENTITY_INSERT $table ON;";
667 $sqlPost = ";SET IDENTITY_INSERT $table OFF;";
668 } else {
669 // we can't insert NULL into an identity column,
670 // so remove the column from the insert.
671 unset( $a[$k] );
672 }
673 }
674 }
675
676 // we want to output an identity column as result
677 $identityClause = "OUTPUT INSERTED.$identity ";
678 }
679
680 $keys = array_keys( $a );
681
682 // Build the actual query
683 $sql = $sqlPre . 'INSERT ' . implode( ' ', $options ) .
684 " INTO $table (" . implode( ',', $keys ) . ") $identityClause VALUES (";
685
686 $first = true;
687 foreach ( $a as $key => $value ) {
688 if ( isset( $binaryColumns[$key] ) ) {
689 $value = new MssqlBlob( $value );
690 }
691 if ( $first ) {
692 $first = false;
693 } else {
694 $sql .= ',';
695 }
696 if ( is_null( $value ) ) {
697 $sql .= 'null';
698 } else {
699 $sql .= $this->addQuotes( $value );
700 }
701 }
702 $sql .= ')' . $sqlPost;
703
704 // Run the query
705 $this->scrollableCursor = false;
706 try {
707 $ret = $this->query( $sql );
708 } catch ( Exception $e ) {
709 $this->scrollableCursor = true;
710 $this->ignoreDupKeyErrors = false;
711 throw $e;
712 }
713 $this->scrollableCursor = true;
714
715 if ( $ret instanceof IResultWrapper && !is_null( $identity ) ) {
716 // Then we want to get the identity column value we were assigned and save it off
717 $row = $ret->fetchObject();
718 if ( is_object( $row ) ) {
719 $this->lastInsertId = $row->$identity;
720 // It seems that mAffectedRows is -1 sometimes when OUTPUT INSERTED.identity is
721 // used if we got an identity back, we know for sure a row was affected, so
722 // adjust that here
723 if ( $this->lastAffectedRowCount == -1 ) {
724 $this->lastAffectedRowCount = 1;
725 }
726 }
727 }
728 }
729
730 $this->ignoreDupKeyErrors = false;
731
732 return true;
733 }
734
735 /**
736 * INSERT SELECT wrapper
737 * $varMap must be an associative array of the form [ 'dest1' => 'source1', ... ]
738 * Source items may be literals rather than field names, but strings should
739 * be quoted with Database::addQuotes().
740 * @param string $destTable
741 * @param array|string $srcTable May be an array of tables.
742 * @param array $varMap
743 * @param array $conds May be "*" to copy the whole table.
744 * @param string $fname
745 * @param array $insertOptions
746 * @param array $selectOptions
747 * @param array $selectJoinConds
748 * @throws Exception
749 */
750 protected function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
751 $insertOptions = [], $selectOptions = [], $selectJoinConds = []
752 ) {
753 $this->scrollableCursor = false;
754 try {
755 parent::nativeInsertSelect(
756 $destTable,
757 $srcTable,
758 $varMap,
759 $conds,
760 $fname,
761 $insertOptions,
762 $selectOptions,
763 $selectJoinConds
764 );
765 } catch ( Exception $e ) {
766 $this->scrollableCursor = true;
767 throw $e;
768 }
769 $this->scrollableCursor = true;
770 }
771
772 /**
773 * UPDATE wrapper. Takes a condition array and a SET array.
774 *
775 * @param string $table Name of the table to UPDATE. This will be passed through
776 * Database::tableName().
777 *
778 * @param array $values An array of values to SET. For each array element,
779 * the key gives the field name, and the value gives the data
780 * to set that field to. The data will be quoted by
781 * Database::addQuotes().
782 *
783 * @param array $conds An array of conditions (WHERE). See
784 * Database::select() for the details of the format of
785 * condition arrays. Use '*' to update all rows.
786 *
787 * @param string $fname The function name of the caller (from __METHOD__),
788 * for logging and profiling.
789 *
790 * @param array $options An array of UPDATE options, can be:
791 * - IGNORE: Ignore unique key conflicts
792 * - LOW_PRIORITY: MySQL-specific, see MySQL manual.
793 * @return bool
794 * @throws DBUnexpectedError
795 * @throws Exception
796 */
797 function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
798 $table = $this->tableName( $table );
799 $binaryColumns = $this->getBinaryColumns( $table );
800
801 $opts = $this->makeUpdateOptions( $options );
802 $sql = "UPDATE $opts $table SET " . $this->makeList( $values, LIST_SET, $binaryColumns );
803
804 if ( $conds !== [] && $conds !== '*' ) {
805 $sql .= " WHERE " . $this->makeList( $conds, LIST_AND, $binaryColumns );
806 }
807
808 $this->scrollableCursor = false;
809 try {
810 $this->query( $sql );
811 } catch ( Exception $e ) {
812 $this->scrollableCursor = true;
813 throw $e;
814 }
815 $this->scrollableCursor = true;
816 return true;
817 }
818
819 /**
820 * Makes an encoded list of strings from an array
821 * @param array $a Containing the data
822 * @param int $mode Constant
823 * - LIST_COMMA: comma separated, no field names
824 * - LIST_AND: ANDed WHERE clause (without the WHERE). See
825 * the documentation for $conds in Database::select().
826 * - LIST_OR: ORed WHERE clause (without the WHERE)
827 * - LIST_SET: comma separated with field names, like a SET clause
828 * - LIST_NAMES: comma separated field names
829 * @param array $binaryColumns Contains a list of column names that are binary types
830 * This is a custom parameter only present for MS SQL.
831 *
832 * @throws DBUnexpectedError
833 * @return string
834 */
835 public function makeList( $a, $mode = LIST_COMMA, $binaryColumns = [] ) {
836 if ( !is_array( $a ) ) {
837 throw new DBUnexpectedError( $this, __METHOD__ . ' called with incorrect parameters' );
838 }
839
840 if ( $mode != LIST_NAMES ) {
841 // In MS SQL, values need to be specially encoded when they are
842 // inserted into binary fields. Perform this necessary encoding
843 // for the specified set of columns.
844 foreach ( array_keys( $a ) as $field ) {
845 if ( !isset( $binaryColumns[$field] ) ) {
846 continue;
847 }
848
849 if ( is_array( $a[$field] ) ) {
850 foreach ( $a[$field] as &$v ) {
851 $v = new MssqlBlob( $v );
852 }
853 unset( $v );
854 } else {
855 $a[$field] = new MssqlBlob( $a[$field] );
856 }
857 }
858 }
859
860 return parent::makeList( $a, $mode );
861 }
862
863 /**
864 * @param string $table
865 * @param string $field
866 * @return int Returns the size of a text field, or -1 for "unlimited"
867 */
868 public function textFieldSize( $table, $field ) {
869 $table = $this->tableName( $table );
870 $sql = "SELECT CHARACTER_MAXIMUM_LENGTH,DATA_TYPE FROM INFORMATION_SCHEMA.Columns
871 WHERE TABLE_NAME = '$table' AND COLUMN_NAME = '$field'";
872 $res = $this->query( $sql );
873 $row = $this->fetchRow( $res );
874 $size = -1;
875 if ( strtolower( $row['DATA_TYPE'] ) != 'text' ) {
876 $size = $row['CHARACTER_MAXIMUM_LENGTH'];
877 }
878
879 return $size;
880 }
881
882 /**
883 * Construct a LIMIT query with optional offset
884 * This is used for query pages
885 *
886 * @param string $sql SQL query we will append the limit too
887 * @param int $limit The SQL limit
888 * @param bool|int $offset The SQL offset (default false)
889 * @return array|string
890 * @throws DBUnexpectedError
891 */
892 public function limitResult( $sql, $limit, $offset = false ) {
893 if ( $offset === false || $offset == 0 ) {
894 if ( strpos( $sql, "SELECT" ) === false ) {
895 return "TOP {$limit} " . $sql;
896 } else {
897 return preg_replace( '/\bSELECT(\s+DISTINCT)?\b/Dsi',
898 'SELECT$1 TOP ' . $limit, $sql, 1 );
899 }
900 } else {
901 // This one is fun, we need to pull out the select list as well as any ORDER BY clause
902 $select = $orderby = [];
903 $s1 = preg_match( '#SELECT\s+(.+?)\s+FROM#Dis', $sql, $select );
904 $s2 = preg_match( '#(ORDER BY\s+.+?)(\s*FOR XML .*)?$#Dis', $sql, $orderby );
905 $postOrder = '';
906 $first = $offset + 1;
907 $last = $offset + $limit;
908 $sub1 = 'sub_' . $this->subqueryId;
909 $sub2 = 'sub_' . ( $this->subqueryId + 1 );
910 $this->subqueryId += 2;
911 if ( !$s1 ) {
912 // wat
913 throw new DBUnexpectedError( $this, "Attempting to LIMIT a non-SELECT query\n" );
914 }
915 if ( !$s2 ) {
916 // no ORDER BY
917 $overOrder = 'ORDER BY (SELECT 1)';
918 } else {
919 if ( !isset( $orderby[2] ) || !$orderby[2] ) {
920 // don't need to strip it out if we're using a FOR XML clause
921 $sql = str_replace( $orderby[1], '', $sql );
922 }
923 $overOrder = $orderby[1];
924 $postOrder = ' ' . $overOrder;
925 }
926 $sql = "SELECT {$select[1]}
927 FROM (
928 SELECT ROW_NUMBER() OVER({$overOrder}) AS rowNumber, *
929 FROM ({$sql}) {$sub1}
930 ) {$sub2}
931 WHERE rowNumber BETWEEN {$first} AND {$last}{$postOrder}";
932
933 return $sql;
934 }
935 }
936
937 /**
938 * If there is a limit clause, parse it, strip it, and pass the remaining
939 * SQL through limitResult() with the appropriate parameters. Not the
940 * prettiest solution, but better than building a whole new parser. This
941 * exists becase there are still too many extensions that don't use dynamic
942 * sql generation.
943 *
944 * @param string $sql
945 * @return array|mixed|string
946 */
947 public function LimitToTopN( $sql ) {
948 // Matches: LIMIT {[offset,] row_count | row_count OFFSET offset}
949 $pattern = '/\bLIMIT\s+((([0-9]+)\s*,\s*)?([0-9]+)(\s+OFFSET\s+([0-9]+))?)/i';
950 if ( preg_match( $pattern, $sql, $matches ) ) {
951 $row_count = $matches[4];
952 $offset = $matches[3] ?: $matches[6] ?: false;
953
954 // strip the matching LIMIT clause out
955 $sql = str_replace( $matches[0], '', $sql );
956
957 return $this->limitResult( $sql, $row_count, $offset );
958 }
959
960 return $sql;
961 }
962
963 /**
964 * @return string Wikitext of a link to the server software's web site
965 */
966 public function getSoftwareLink() {
967 return "[{{int:version-db-mssql-url}} MS SQL Server]";
968 }
969
970 /**
971 * @return string Version information from the database
972 */
973 public function getServerVersion() {
974 $server_info = sqlsrv_server_info( $this->conn );
975 $version = $server_info['SQLServerVersion'] ?? 'Error';
976
977 return $version;
978 }
979
980 /**
981 * @param string $table
982 * @param string $fname
983 * @return bool
984 */
985 public function tableExists( $table, $fname = __METHOD__ ) {
986 list( $db, $schema, $table ) = $this->tableName( $table, 'split' );
987
988 if ( $db !== false ) {
989 // remote database
990 $this->queryLogger->error( "Attempting to call tableExists on a remote table" );
991 return false;
992 }
993
994 if ( $schema === false ) {
995 $schema = $this->dbSchema();
996 }
997
998 $res = $this->query( "SELECT 1 FROM INFORMATION_SCHEMA.TABLES
999 WHERE TABLE_TYPE = 'BASE TABLE'
1000 AND TABLE_SCHEMA = '$schema' AND TABLE_NAME = '$table'" );
1001
1002 if ( $res->numRows() ) {
1003 return true;
1004 } else {
1005 return false;
1006 }
1007 }
1008
1009 /**
1010 * Query whether a given column exists in the mediawiki schema
1011 * @param string $table
1012 * @param string $field
1013 * @param string $fname
1014 * @return bool
1015 */
1016 public function fieldExists( $table, $field, $fname = __METHOD__ ) {
1017 list( $db, $schema, $table ) = $this->tableName( $table, 'split' );
1018
1019 if ( $db !== false ) {
1020 // remote database
1021 $this->queryLogger->error( "Attempting to call fieldExists on a remote table" );
1022 return false;
1023 }
1024
1025 $res = $this->query( "SELECT 1 FROM INFORMATION_SCHEMA.COLUMNS
1026 WHERE TABLE_SCHEMA = '$schema' AND TABLE_NAME = '$table' AND COLUMN_NAME = '$field'" );
1027
1028 if ( $res->numRows() ) {
1029 return true;
1030 } else {
1031 return false;
1032 }
1033 }
1034
1035 public function fieldInfo( $table, $field ) {
1036 list( $db, $schema, $table ) = $this->tableName( $table, 'split' );
1037
1038 if ( $db !== false ) {
1039 // remote database
1040 $this->queryLogger->error( "Attempting to call fieldInfo on a remote table" );
1041 return false;
1042 }
1043
1044 $res = $this->query( "SELECT * FROM INFORMATION_SCHEMA.COLUMNS
1045 WHERE TABLE_SCHEMA = '$schema' AND TABLE_NAME = '$table' AND COLUMN_NAME = '$field'" );
1046
1047 $meta = $res->fetchRow();
1048 if ( $meta ) {
1049 return new MssqlField( $meta );
1050 }
1051
1052 return false;
1053 }
1054
1055 protected function doSavepoint( $identifier, $fname ) {
1056 $this->query( 'SAVE TRANSACTION ' . $this->addIdentifierQuotes( $identifier ), $fname );
1057 }
1058
1059 protected function doReleaseSavepoint( $identifier, $fname ) {
1060 // Not supported. Also not really needed, a new doSavepoint() for the
1061 // same identifier will overwrite the old.
1062 }
1063
1064 protected function doRollbackToSavepoint( $identifier, $fname ) {
1065 $this->query( 'ROLLBACK TRANSACTION ' . $this->addIdentifierQuotes( $identifier ), $fname );
1066 }
1067
1068 protected function doBegin( $fname = __METHOD__ ) {
1069 if ( !sqlsrv_begin_transaction( $this->conn ) ) {
1070 $this->reportQueryError( $this->lastError(), $this->lastErrno(), 'BEGIN', $fname );
1071 }
1072 }
1073
1074 /**
1075 * End a transaction
1076 * @param string $fname
1077 */
1078 protected function doCommit( $fname = __METHOD__ ) {
1079 if ( !sqlsrv_commit( $this->conn ) ) {
1080 $this->reportQueryError( $this->lastError(), $this->lastErrno(), 'COMMIT', $fname );
1081 }
1082 }
1083
1084 /**
1085 * Rollback a transaction.
1086 * No-op on non-transactional databases.
1087 * @param string $fname
1088 */
1089 protected function doRollback( $fname = __METHOD__ ) {
1090 if ( !sqlsrv_rollback( $this->conn ) ) {
1091 $this->queryLogger->error(
1092 "{fname}\t{db_server}\t{errno}\t{error}\t",
1093 $this->getLogContext( [
1094 'errno' => $this->lastErrno(),
1095 'error' => $this->lastError(),
1096 'fname' => $fname,
1097 'trace' => ( new RuntimeException() )->getTraceAsString()
1098 ] )
1099 );
1100 }
1101 }
1102
1103 /**
1104 * @param string $s
1105 * @return string
1106 */
1107 public function strencode( $s ) {
1108 // Should not be called by us
1109 return str_replace( "'", "''", $s );
1110 }
1111
1112 /**
1113 * @param string|int|null|bool|Blob $s
1114 * @return string|int
1115 */
1116 public function addQuotes( $s ) {
1117 if ( $s instanceof MssqlBlob ) {
1118 return $s->fetch();
1119 } elseif ( $s instanceof Blob ) {
1120 // this shouldn't really ever be called, but it's here if needed
1121 // (and will quite possibly make the SQL error out)
1122 $blob = new MssqlBlob( $s->fetch() );
1123 return $blob->fetch();
1124 } else {
1125 if ( is_bool( $s ) ) {
1126 $s = $s ? 1 : 0;
1127 }
1128 return parent::addQuotes( $s );
1129 }
1130 }
1131
1132 /**
1133 * @param string $s
1134 * @return string
1135 */
1136 public function addIdentifierQuotes( $s ) {
1137 // http://msdn.microsoft.com/en-us/library/aa223962.aspx
1138 return '[' . $s . ']';
1139 }
1140
1141 /**
1142 * @param string $name
1143 * @return bool
1144 */
1145 public function isQuotedIdentifier( $name ) {
1146 return strlen( $name ) && $name[0] == '[' && substr( $name, -1, 1 ) == ']';
1147 }
1148
1149 /**
1150 * MS SQL supports more pattern operators than other databases (ex: [,],^)
1151 *
1152 * @param string $s
1153 * @param string $escapeChar
1154 * @return string
1155 */
1156 protected function escapeLikeInternal( $s, $escapeChar = '`' ) {
1157 return str_replace( [ $escapeChar, '%', '_', '[', ']', '^' ],
1158 [ "{$escapeChar}{$escapeChar}", "{$escapeChar}%", "{$escapeChar}_",
1159 "{$escapeChar}[", "{$escapeChar}]", "{$escapeChar}^" ],
1160 $s );
1161 }
1162
1163 protected function doSelectDomain( DatabaseDomain $domain ) {
1164 if ( $domain->getSchema() !== null ) {
1165 throw new DBExpectedError(
1166 $this,
1167 __CLASS__ . ": domain '{$domain->getId()}' has a schema component"
1168 );
1169 }
1170
1171 $database = $domain->getDatabase();
1172 if ( $database !== $this->getDBname() ) {
1173 $sql = 'USE ' . $this->addIdentifierQuotes( $database );
1174 list( $res, $err, $errno ) =
1175 $this->executeQuery( $sql, __METHOD__, self::QUERY_IGNORE_DBO_TRX );
1176
1177 if ( $res === false ) {
1178 $this->reportQueryError( $err, $errno, $sql, __METHOD__ );
1179 return false; // unreachable
1180 }
1181 }
1182 // Update that domain fields on success (no exception thrown)
1183 $this->currentDomain = $domain;
1184
1185 return true;
1186 }
1187
1188 /**
1189 * @param array $options An associative array of options to be turned into
1190 * an SQL query, valid keys are listed in the function.
1191 * @return array
1192 */
1193 public function makeSelectOptions( $options ) {
1194 $tailOpts = '';
1195 $startOpts = '';
1196
1197 $noKeyOptions = [];
1198 foreach ( $options as $key => $option ) {
1199 if ( is_numeric( $key ) ) {
1200 $noKeyOptions[$option] = true;
1201 }
1202 }
1203
1204 $tailOpts .= $this->makeGroupByWithHaving( $options );
1205
1206 $tailOpts .= $this->makeOrderBy( $options );
1207
1208 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1209 $startOpts .= 'DISTINCT';
1210 }
1211
1212 if ( isset( $noKeyOptions['FOR XML'] ) ) {
1213 // used in group concat field emulation
1214 $tailOpts .= " FOR XML PATH('')";
1215 }
1216
1217 // we want this to be compatible with the output of parent::makeSelectOptions()
1218 return [ $startOpts, '', $tailOpts, '', '' ];
1219 }
1220
1221 public function getType() {
1222 return 'mssql';
1223 }
1224
1225 /**
1226 * @param array $stringList
1227 * @return string
1228 */
1229 public function buildConcat( $stringList ) {
1230 return implode( ' + ', $stringList );
1231 }
1232
1233 /**
1234 * Build a GROUP_CONCAT or equivalent statement for a query.
1235 * MS SQL doesn't have GROUP_CONCAT so we emulate it with other stuff (and boy is it nasty)
1236 *
1237 * This is useful for combining a field for several rows into a single string.
1238 * NULL values will not appear in the output, duplicated values will appear,
1239 * and the resulting delimiter-separated values have no defined sort order.
1240 * Code using the results may need to use the PHP unique() or sort() methods.
1241 *
1242 * @param string $delim Glue to bind the results together
1243 * @param string|array $table Table name
1244 * @param string $field Field name
1245 * @param string|array $conds Conditions
1246 * @param string|array $join_conds Join conditions
1247 * @return string SQL text
1248 * @since 1.23
1249 */
1250 public function buildGroupConcatField( $delim, $table, $field, $conds = '',
1251 $join_conds = []
1252 ) {
1253 $gcsq = 'gcsq_' . $this->subqueryId;
1254 $this->subqueryId++;
1255
1256 $delimLen = strlen( $delim );
1257 $fld = "{$field} + {$this->addQuotes( $delim )}";
1258 $sql = "(SELECT LEFT({$field}, LEN({$field}) - {$delimLen}) FROM ("
1259 . $this->selectSQLText( $table, $fld, $conds, null, [ 'FOR XML' ], $join_conds )
1260 . ") {$gcsq} ({$field}))";
1261
1262 return $sql;
1263 }
1264
1265 public function buildSubstring( $input, $startPosition, $length = null ) {
1266 $this->assertBuildSubstringParams( $startPosition, $length );
1267 if ( $length === null ) {
1268 /**
1269 * MSSQL doesn't allow an empty length parameter, so when we don't want to limit the
1270 * length returned use the default maximum size of text.
1271 * @see https://docs.microsoft.com/en-us/sql/t-sql/statements/set-textsize-transact-sql
1272 */
1273 $length = 2147483647;
1274 }
1275 return 'SUBSTRING(' . implode( ',', [ $input, $startPosition, $length ] ) . ')';
1276 }
1277
1278 /**
1279 * Returns an associative array for fields that are of type varbinary, binary, or image
1280 * $table can be either a raw table name or passed through tableName() first
1281 * @param string $table
1282 * @return array
1283 */
1284 private function getBinaryColumns( $table ) {
1285 $tableRawArr = explode( '.', preg_replace( '#\[([^\]]*)\]#', '$1', $table ) );
1286 $tableRaw = array_pop( $tableRawArr );
1287
1288 if ( $this->binaryColumnCache === null ) {
1289 $this->populateColumnCaches();
1290 }
1291
1292 return $this->binaryColumnCache[$tableRaw] ?? [];
1293 }
1294
1295 /**
1296 * @param string $table
1297 * @return array
1298 */
1299 private function getBitColumns( $table ) {
1300 $tableRawArr = explode( '.', preg_replace( '#\[([^\]]*)\]#', '$1', $table ) );
1301 $tableRaw = array_pop( $tableRawArr );
1302
1303 if ( $this->bitColumnCache === null ) {
1304 $this->populateColumnCaches();
1305 }
1306
1307 return $this->bitColumnCache[$tableRaw] ?? [];
1308 }
1309
1310 private function populateColumnCaches() {
1311 $res = $this->select( 'INFORMATION_SCHEMA.COLUMNS', '*',
1312 [
1313 'TABLE_CATALOG' => $this->getDBname(),
1314 'TABLE_SCHEMA' => $this->dbSchema(),
1315 'DATA_TYPE' => [ 'varbinary', 'binary', 'image', 'bit' ]
1316 ] );
1317
1318 $this->binaryColumnCache = [];
1319 $this->bitColumnCache = [];
1320 foreach ( $res as $row ) {
1321 if ( $row->DATA_TYPE == 'bit' ) {
1322 $this->bitColumnCache[$row->TABLE_NAME][$row->COLUMN_NAME] = $row;
1323 } else {
1324 $this->binaryColumnCache[$row->TABLE_NAME][$row->COLUMN_NAME] = $row;
1325 }
1326 }
1327 }
1328
1329 /**
1330 * @param string $name
1331 * @param string $format One of "quoted" (default), "raw", or "split".
1332 * @return string|array When the requested $format is "split", a list of database, schema, and
1333 * table name is returned. Database and schema can be `false`.
1334 */
1335 function tableName( $name, $format = 'quoted' ) {
1336 # Replace reserved words with better ones
1337 switch ( $name ) {
1338 case 'user':
1339 return $this->realTableName( 'mwuser', $format );
1340 default:
1341 return $this->realTableName( $name, $format );
1342 }
1343 }
1344
1345 /**
1346 * call this instead of tableName() in the updater when renaming tables
1347 * @param string $name
1348 * @param string $format One of "quoted" (default), "raw", or "split".
1349 * @return string|array When the requested $format is "split", a list of database, schema, and
1350 * table name is returned. Database and schema can be `false`.
1351 * @private
1352 */
1353 function realTableName( $name, $format = 'quoted' ) {
1354 $table = parent::tableName( $name, $format );
1355 if ( $format == 'split' ) {
1356 // Used internally, we want the schema split off from the table name and returned
1357 // as a list with 3 elements (database, schema, table)
1358 return array_pad( explode( '.', $table, 3 ), -3, false );
1359 }
1360 return $table;
1361 }
1362
1363 /**
1364 * Delete a table
1365 * @param string $tableName
1366 * @param string $fName
1367 * @return bool|IResultWrapper
1368 * @since 1.18
1369 */
1370 public function dropTable( $tableName, $fName = __METHOD__ ) {
1371 if ( !$this->tableExists( $tableName, $fName ) ) {
1372 return false;
1373 }
1374
1375 // parent function incorrectly appends CASCADE, which we don't want
1376 $sql = "DROP TABLE " . $this->tableName( $tableName );
1377
1378 return $this->query( $sql, $fName );
1379 }
1380
1381 /**
1382 * Called in the installer and updater.
1383 * Probably doesn't need to be called anywhere else in the codebase.
1384 * @param bool|null $value
1385 * @return bool|null
1386 */
1387 public function prepareStatements( $value = null ) {
1388 $old = $this->prepareStatements;
1389 if ( $value !== null ) {
1390 $this->prepareStatements = $value;
1391 }
1392
1393 return $old;
1394 }
1395
1396 /**
1397 * Called in the installer and updater.
1398 * Probably doesn't need to be called anywhere else in the codebase.
1399 * @param bool|null $value
1400 * @return bool|null
1401 */
1402 public function scrollableCursor( $value = null ) {
1403 $old = $this->scrollableCursor;
1404 if ( $value !== null ) {
1405 $this->scrollableCursor = $value;
1406 }
1407
1408 return $old;
1409 }
1410
1411 public function buildStringCast( $field ) {
1412 return "CAST( $field AS NVARCHAR )";
1413 }
1414
1415 public static function getAttributes() {
1416 return [ self::ATTR_SCHEMAS_AS_TABLE_GROUPS => true ];
1417 }
1418 }
1419
1420 /**
1421 * @deprecated since 1.29
1422 */
1423 class_alias( DatabaseMssql::class, 'DatabaseMssql' );
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