includes/db/DatabaseOracle.php

   1 <?php
   2 /**
   3  * This is the Oracle 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  */
  23
  24 /**
  25  * The oci8 extension is fairly weak and doesn't support oci_num_rows, among
  26  * other things. We use a wrapper class to handle that and other
  27  * Oracle-specific bits, like converting column names back to lowercase.
  28  * @ingroup Database
  29  */
  30 class ORAResult {
  31         private $rows;
  32         private $cursor;
  33         private $nrows;
  34
  35         private $columns = [];
  36
  37         private function array_unique_md( $array_in ) {
  38                 $array_out = [];
  39                 $array_hashes = [];
  40
  41                 foreach ( $array_in as $item ) {
  42                         $hash = md5( serialize( $item ) );
  43                         if ( !isset( $array_hashes[$hash] ) ) {
  44                                 $array_hashes[$hash] = $hash;
  45                                 $array_out[] = $item;
  46                         }
  47                 }
  48
  49                 return $array_out;
  50         }
  51
  52         /**
  53          * @param IDatabase $db
  54          * @param resource $stmt A valid OCI statement identifier
  55          * @param bool $unique
  56          */
  57         function __construct( &$db, $stmt, $unique = false ) {
  58                 $this->db =& $db;
  59
  60                 $this->nrows = oci_fetch_all( $stmt, $this->rows, 0, -1, OCI_FETCHSTATEMENT_BY_ROW | OCI_NUM );
  61                 if ( $this->nrows === false ) {
  62                         $e = oci_error( $stmt );
  63                         $db->reportQueryError( $e['message'], $e['code'], '', __METHOD__ );
  64                         $this->free();
  65
  66                         return;
  67                 }
  68
  69                 if ( $unique ) {
  70                         $this->rows = $this->array_unique_md( $this->rows );
  71                         $this->nrows = count( $this->rows );
  72                 }
  73
  74                 if ( $this->nrows > 0 ) {
  75                         foreach ( $this->rows[0] as $k => $v ) {
  76                                 $this->columns[$k] = strtolower( oci_field_name( $stmt, $k + 1 ) );
  77                         }
  78                 }
  79
  80                 $this->cursor = 0;
  81                 oci_free_statement( $stmt );
  82         }
  83
  84         public function free() {
  85                 unset( $this->db );
  86         }
  87
  88         public function seek( $row ) {
  89                 $this->cursor = min( $row, $this->nrows );
  90         }
  91
  92         public function numRows() {
  93                 return $this->nrows;
  94         }
  95
  96         public function numFields() {
  97                 return count( $this->columns );
  98         }
  99
 100         public function fetchObject() {
 101                 if ( $this->cursor >= $this->nrows ) {
 102                         return false;
 103                 }
 104                 $row = $this->rows[$this->cursor++];
 105                 $ret = new stdClass();
 106                 foreach ( $row as $k => $v ) {
 107                         $lc = $this->columns[$k];
 108                         $ret->$lc = $v;
 109                 }
 110
 111                 return $ret;
 112         }
 113
 114         public function fetchRow() {
 115                 if ( $this->cursor >= $this->nrows ) {
 116                         return false;
 117                 }
 118
 119                 $row = $this->rows[$this->cursor++];
 120                 $ret = [];
 121                 foreach ( $row as $k => $v ) {
 122                         $lc = $this->columns[$k];
 123                         $ret[$lc] = $v;
 124                         $ret[$k] = $v;
 125                 }
 126
 127                 return $ret;
 128         }
 129 }
 130
 131 /**
 132  * @ingroup Database
 133  */
 134 class DatabaseOracle extends DatabaseBase {
 135         /** @var resource */
 136         protected $mLastResult = null;
 137
 138         /** @var int The number of rows affected as an integer */
 139         protected $mAffectedRows;
 140
 141         /** @var int */
 142         private $mInsertId = null;
 143
 144         /** @var bool */
 145         private $ignoreDupValOnIndex = false;
 146
 147         /** @var bool|array */
 148         private $sequenceData = null;
 149
 150         /** @var string Character set for Oracle database */
 151         private $defaultCharset = 'AL32UTF8';
 152
 153         /** @var array */
 154         private $mFieldInfoCache = [];
 155
 156         function __construct( array $p ) {
 157                 global $wgDBprefix;
 158
 159                 if ( $p['tablePrefix'] == 'get from global' ) {
 160                         $p['tablePrefix'] = $wgDBprefix;
 161                 }
 162                 $p['tablePrefix'] = strtoupper( $p['tablePrefix'] );
 163                 parent::__construct( $p );
 164                 Hooks::run( 'DatabaseOraclePostInit', [ $this ] );
 165         }
 166
 167         function __destruct() {
 168                 if ( $this->mOpened ) {
 169                         MediaWiki\suppressWarnings();
 170                         $this->close();
 171                         MediaWiki\restoreWarnings();
 172                 }
 173         }
 174
 175         function getType() {
 176                 return 'oracle';
 177         }
 178
 179         function cascadingDeletes() {
 180                 return true;
 181         }
 182
 183         function cleanupTriggers() {
 184                 return true;
 185         }
 186
 187         function strictIPs() {
 188                 return true;
 189         }
 190
 191         function realTimestamps() {
 192                 return true;
 193         }
 194
 195         function implicitGroupby() {
 196                 return false;
 197         }
 198
 199         function implicitOrderby() {
 200                 return false;
 201         }
 202
 203         function searchableIPs() {
 204                 return true;
 205         }
 206
 207         /**
 208          * Usually aborts on failure
 209          * @param string $server
 210          * @param string $user
 211          * @param string $password
 212          * @param string $dbName
 213          * @throws DBConnectionError
 214          * @return resource|null
 215          */
 216         function open( $server, $user, $password, $dbName ) {
 217                 global $wgDBOracleDRCP;
 218                 if ( !function_exists( 'oci_connect' ) ) {
 219                         throw new DBConnectionError(
 220                                 $this,
 221                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
 222                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
 223                                         "and database)\n" );
 224                 }
 225
 226                 $this->close();
 227                 $this->mUser = $user;
 228                 $this->mPassword = $password;
 229                 // changed internal variables functions
 230                 // mServer now holds the TNS endpoint
 231                 // mDBname is schema name if different from username
 232                 if ( !$server ) {
 233                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 234                         $this->mServer = $dbName;
 235                         $this->mDBname = $user;
 236                 } else {
 237                         $this->mServer = $server;
 238                         if ( !$dbName ) {
 239                                 $this->mDBname = $user;
 240                         } else {
 241                                 $this->mDBname = $dbName;
 242                         }
 243                 }
 244
 245                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 246                         return null;
 247                 }
 248
 249                 if ( $wgDBOracleDRCP ) {
 250                         $this->setFlag( DBO_PERSISTENT );
 251                 }
 252
 253                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 254
 255                 MediaWiki\suppressWarnings();
 256                 if ( $this->mFlags & DBO_PERSISTENT ) {
 257                         $this->mConn = oci_pconnect(
 258                                 $this->mUser,
 259                                 $this->mPassword,
 260                                 $this->mServer,
 261                                 $this->defaultCharset,
 262                                 $session_mode
 263                         );
 264                 } elseif ( $this->mFlags & DBO_DEFAULT ) {
 265                         $this->mConn = oci_new_connect(
 266                                 $this->mUser,
 267                                 $this->mPassword,
 268                                 $this->mServer,
 269                                 $this->defaultCharset,
 270                                 $session_mode
 271                         );
 272                 } else {
 273                         $this->mConn = oci_connect(
 274                                 $this->mUser,
 275                                 $this->mPassword,
 276                                 $this->mServer,
 277                                 $this->defaultCharset,
 278                                 $session_mode
 279                         );
 280                 }
 281                 MediaWiki\restoreWarnings();
 282
 283                 if ( $this->mUser != $this->mDBname ) {
 284                         // change current schema in session
 285                         $this->selectDB( $this->mDBname );
 286                 }
 287
 288                 if ( !$this->mConn ) {
 289                         throw new DBConnectionError( $this, $this->lastError() );
 290                 }
 291
 292                 $this->mOpened = true;
 293
 294                 # removed putenv calls because they interfere with the system globaly
 295                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 296                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 297                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 298
 299                 return $this->mConn;
 300         }
 301
 302         /**
 303          * Closes a database connection, if it is open
 304          * Returns success, true if already closed
 305          * @return bool
 306          */
 307         protected function closeConnection() {
 308                 return oci_close( $this->mConn );
 309         }
 310
 311         function execFlags() {
 312                 return $this->mTrxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 313         }
 314
 315         protected function doQuery( $sql ) {
 316                 wfDebug( "SQL: [$sql]\n" );
 317                 if ( !StringUtils::isUtf8( $sql ) ) {
 318                         throw new InvalidArgumentException( "SQL encoding is invalid\n$sql" );
 319                 }
 320
 321                 // handle some oracle specifics
 322                 // remove AS column/table/subquery namings
 323                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 324                         $sql = preg_replace( '/ as /i', ' ', $sql );
 325                 }
 326
 327                 // Oracle has issues with UNION clause if the statement includes LOB fields
 328                 // So we do a UNION ALL and then filter the results array with array_unique
 329                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 330                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 331                 // you have to select data from plan table after explain
 332                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 333
 334                 $sql = preg_replace(
 335                         '/^EXPLAIN /',
 336                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 337                         $sql,
 338                         1,
 339                         $explain_count
 340                 );
 341
 342                 MediaWiki\suppressWarnings();
 343
 344                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
 345                 if ( $stmt === false ) {
 346                         $e = oci_error( $this->mConn );
 347                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 348
 349                         return false;
 350                 }
 351
 352                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 353                         $e = oci_error( $stmt );
 354                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 355                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 356
 357                                 return false;
 358                         }
 359                 }
 360
 361                 MediaWiki\restoreWarnings();
 362
 363                 if ( $explain_count > 0 ) {
 364                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 365                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 366                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 367                         return new ORAResult( $this, $stmt, $union_unique );
 368                 } else {
 369                         $this->mAffectedRows = oci_num_rows( $stmt );
 370
 371                         return true;
 372                 }
 373         }
 374
 375         function queryIgnore( $sql, $fname = '' ) {
 376                 return $this->query( $sql, $fname, true );
 377         }
 378
 379         /**
 380          * Frees resources associated with the LOB descriptor
 381          * @param ResultWrapper|ORAResult $res
 382          */
 383         function freeResult( $res ) {
 384                 if ( $res instanceof ResultWrapper ) {
 385                         $res = $res->result;
 386                 }
 387
 388                 $res->free();
 389         }
 390
 391         /**
 392          * @param ResultWrapper|ORAResult $res
 393          * @return mixed
 394          */
 395         function fetchObject( $res ) {
 396                 if ( $res instanceof ResultWrapper ) {
 397                         $res = $res->result;
 398                 }
 399
 400                 return $res->fetchObject();
 401         }
 402
 403         /**
 404          * @param ResultWrapper|ORAResult $res
 405          * @return mixed
 406          */
 407         function fetchRow( $res ) {
 408                 if ( $res instanceof ResultWrapper ) {
 409                         $res = $res->result;
 410                 }
 411
 412                 return $res->fetchRow();
 413         }
 414
 415         /**
 416          * @param ResultWrapper|ORAResult $res
 417          * @return int
 418          */
 419         function numRows( $res ) {
 420                 if ( $res instanceof ResultWrapper ) {
 421                         $res = $res->result;
 422                 }
 423
 424                 return $res->numRows();
 425         }
 426
 427         /**
 428          * @param ResultWrapper|ORAResult $res
 429          * @return int
 430          */
 431         function numFields( $res ) {
 432                 if ( $res instanceof ResultWrapper ) {
 433                         $res = $res->result;
 434                 }
 435
 436                 return $res->numFields();
 437         }
 438
 439         function fieldName( $stmt, $n ) {
 440                 return oci_field_name( $stmt, $n );
 441         }
 442
 443         /**
 444          * This must be called after nextSequenceVal
 445          * @return null|int
 446          */
 447         function insertId() {
 448                 return $this->mInsertId;
 449         }
 450
 451         /**
 452          * @param mixed $res
 453          * @param int $row
 454          */
 455         function dataSeek( $res, $row ) {
 456                 if ( $res instanceof ORAResult ) {
 457                         $res->seek( $row );
 458                 } else {
 459                         $res->result->seek( $row );
 460                 }
 461         }
 462
 463         function lastError() {
 464                 if ( $this->mConn === false ) {
 465                         $e = oci_error();
 466                 } else {
 467                         $e = oci_error( $this->mConn );
 468                 }
 469
 470                 return $e['message'];
 471         }
 472
 473         function lastErrno() {
 474                 if ( $this->mConn === false ) {
 475                         $e = oci_error();
 476                 } else {
 477                         $e = oci_error( $this->mConn );
 478                 }
 479
 480                 return $e['code'];
 481         }
 482
 483         function affectedRows() {
 484                 return $this->mAffectedRows;
 485         }
 486
 487         /**
 488          * Returns information about an index
 489          * If errors are explicitly ignored, returns NULL on failure
 490          * @param string $table
 491          * @param string $index
 492          * @param string $fname
 493          * @return bool
 494          */
 495         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 496                 return false;
 497         }
 498
 499         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 500                 return false;
 501         }
 502
 503         function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 504                 if ( !count( $a ) ) {
 505                         return true;
 506                 }
 507
 508                 if ( !is_array( $options ) ) {
 509                         $options = [ $options ];
 510                 }
 511
 512                 if ( in_array( 'IGNORE', $options ) ) {
 513                         $this->ignoreDupValOnIndex = true;
 514                 }
 515
 516                 if ( !is_array( reset( $a ) ) ) {
 517                         $a = [ $a ];
 518                 }
 519
 520                 foreach ( $a as &$row ) {
 521                         $this->insertOneRow( $table, $row, $fname );
 522                 }
 523                 $retVal = true;
 524
 525                 if ( in_array( 'IGNORE', $options ) ) {
 526                         $this->ignoreDupValOnIndex = false;
 527                 }
 528
 529                 return $retVal;
 530         }
 531
 532         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 533                 $col_info = $this->fieldInfoMulti( $table, $col );
 534                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 535
 536                 $bind = '';
 537                 if ( is_numeric( $col ) ) {
 538                         $bind = $val;
 539                         $val = null;
 540
 541                         return $bind;
 542                 } elseif ( $includeCol ) {
 543                         $bind = "$col = ";
 544                 }
 545
 546                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 547                         $val = null;
 548                 }
 549
 550                 if ( $val === 'NULL' ) {
 551                         $val = null;
 552                 }
 553
 554                 if ( $val === null ) {
 555                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 556                                 $bind .= 'DEFAULT';
 557                         } else {
 558                                 $bind .= 'NULL';
 559                         }
 560                 } else {
 561                         $bind .= ':' . $col;
 562                 }
 563
 564                 return $bind;
 565         }
 566
 567         /**
 568          * @param string $table
 569          * @param array $row
 570          * @param string $fname
 571          * @return bool
 572          * @throws DBUnexpectedError
 573          */
 574         private function insertOneRow( $table, $row, $fname ) {
 575                 global $wgContLang;
 576
 577                 $table = $this->tableName( $table );
 578                 // "INSERT INTO tables (a, b, c)"
 579                 $sql = "INSERT INTO " . $table . " (" . implode( ',', array_keys( $row ) ) . ')';
 580                 $sql .= " VALUES (";
 581
 582                 // for each value, append ":key"
 583                 $first = true;
 584                 foreach ( $row as $col => &$val ) {
 585                         if ( !$first ) {
 586                                 $sql .= ', ';
 587                         } else {
 588                                 $first = false;
 589                         }
 590                         if ( $this->isQuotedIdentifier( $val ) ) {
 591                                 $sql .= $this->removeIdentifierQuotes( $val );
 592                                 unset( $row[$col] );
 593                         } else {
 594                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 595                         }
 596                 }
 597                 $sql .= ')';
 598
 599                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
 600                 if ( $stmt === false ) {
 601                         $e = oci_error( $this->mConn );
 602                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 603
 604                         return false;
 605                 }
 606                 foreach ( $row as $col => &$val ) {
 607                         $col_info = $this->fieldInfoMulti( $table, $col );
 608                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 609
 610                         if ( $val === null ) {
 611                                 // do nothing ... null was inserted in statement creation
 612                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 613                                 if ( is_object( $val ) ) {
 614                                         $val = $val->fetch();
 615                                 }
 616
 617                                 // backward compatibility
 618                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 619                                         $val = $this->getInfinity();
 620                                 }
 621
 622                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 623                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 624                                         $e = oci_error( $stmt );
 625                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 626
 627                                         return false;
 628                                 }
 629                         } else {
 630                                 /** @var OCI_Lob[] $lob */
 631                                 $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB );
 632                                 if ( $lob[$col] === false ) {
 633                                         $e = oci_error( $stmt );
 634                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 635                                 }
 636
 637                                 if ( is_object( $val ) ) {
 638                                         $val = $val->fetch();
 639                                 }
 640
 641                                 if ( $col_type == 'BLOB' ) {
 642                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 643                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 644                                 } else {
 645                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 646                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 647                                 }
 648                         }
 649                 }
 650
 651                 MediaWiki\suppressWarnings();
 652
 653                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 654                         $e = oci_error( $stmt );
 655                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 656                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 657
 658                                 return false;
 659                         } else {
 660                                 $this->mAffectedRows = oci_num_rows( $stmt );
 661                         }
 662                 } else {
 663                         $this->mAffectedRows = oci_num_rows( $stmt );
 664                 }
 665
 666                 MediaWiki\restoreWarnings();
 667
 668                 if ( isset( $lob ) ) {
 669                         foreach ( $lob as $lob_v ) {
 670                                 $lob_v->free();
 671                         }
 672                 }
 673
 674                 if ( !$this->mTrxLevel ) {
 675                         oci_commit( $this->mConn );
 676                 }
 677
 678                 return oci_free_statement( $stmt );
 679         }
 680
 681         function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 682                 $insertOptions = [], $selectOptions = []
 683         ) {
 684                 $destTable = $this->tableName( $destTable );
 685                 if ( !is_array( $selectOptions ) ) {
 686                         $selectOptions = [ $selectOptions ];
 687                 }
 688                 list( $startOpts, $useIndex, $tailOpts, $ignoreIndex ) =
 689                         $this->makeSelectOptions( $selectOptions );
 690                 if ( is_array( $srcTable ) ) {
 691                         $srcTable = implode( ',', array_map( [ &$this, 'tableName' ], $srcTable ) );
 692                 } else {
 693                         $srcTable = $this->tableName( $srcTable );
 694                 }
 695
 696                 $sequenceData = $this->getSequenceData( $destTable );
 697                 if ( $sequenceData !== false &&
 698                         !isset( $varMap[$sequenceData['column']] )
 699                 ) {
 700                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 701                 }
 702
 703                 // count-alias subselect fields to avoid abigious definition errors
 704                 $i = 0;
 705                 foreach ( $varMap as &$val ) {
 706                         $val = $val . ' field' . ( $i++ );
 707                 }
 708
 709                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 710                         " SELECT $startOpts " . implode( ',', $varMap ) .
 711                         " FROM $srcTable $useIndex $ignoreIndex ";
 712                 if ( $conds != '*' ) {
 713                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 714                 }
 715                 $sql .= " $tailOpts";
 716
 717                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 718                         $this->ignoreDupValOnIndex = true;
 719                 }
 720
 721                 $retval = $this->query( $sql, $fname );
 722
 723                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 724                         $this->ignoreDupValOnIndex = false;
 725                 }
 726
 727                 return $retval;
 728         }
 729
 730         public function upsert( $table, array $rows, array $uniqueIndexes, array $set,
 731                 $fname = __METHOD__
 732         ) {
 733                 if ( !count( $rows ) ) {
 734                         return true; // nothing to do
 735                 }
 736
 737                 if ( !is_array( reset( $rows ) ) ) {
 738                         $rows = [ $rows ];
 739                 }
 740
 741                 $sequenceData = $this->getSequenceData( $table );
 742                 if ( $sequenceData !== false ) {
 743                         // add sequence column to each list of columns, when not set
 744                         foreach ( $rows as &$row ) {
 745                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 746                                         $row[$sequenceData['column']] =
 747                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 748                                                         $sequenceData['sequence'] . '\')' );
 749                                 }
 750                         }
 751                 }
 752
 753                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 754         }
 755
 756         function tableName( $name, $format = 'quoted' ) {
 757                 /*
 758                 Replace reserved words with better ones
 759                 Using uppercase because that's the only way Oracle can handle
 760                 quoted tablenames
 761                 */
 762                 switch ( $name ) {
 763                         case 'user':
 764                                 $name = 'MWUSER';
 765                                 break;
 766                         case 'text':
 767                                 $name = 'PAGECONTENT';
 768                                 break;
 769                 }
 770
 771                 return strtoupper( parent::tableName( $name, $format ) );
 772         }
 773
 774         function tableNameInternal( $name ) {
 775                 $name = $this->tableName( $name );
 776
 777                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 778         }
 779
 780         /**
 781          * Return the next in a sequence, save the value for retrieval via insertId()
 782          *
 783          * @param string $seqName
 784          * @return null|int
 785          */
 786         function nextSequenceValue( $seqName ) {
 787                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 788                 $row = $this->fetchRow( $res );
 789                 $this->mInsertId = $row[0];
 790
 791                 return $this->mInsertId;
 792         }
 793
 794         /**
 795          * Return sequence_name if table has a sequence
 796          *
 797          * @param string $table
 798          * @return bool
 799          */
 800         private function getSequenceData( $table ) {
 801                 if ( $this->sequenceData == null ) {
 802                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 803                                 lower(atc.table_name),
 804                                 lower(atc.column_name)
 805                         FROM all_sequences asq, all_tab_columns atc
 806                         WHERE decode(
 807                                         atc.table_name,
 808                                         '{$this->mTablePrefix}MWUSER',
 809                                         '{$this->mTablePrefix}USER',
 810                                         atc.table_name
 811                                 ) || '_' ||
 812                                 atc.column_name || '_SEQ' = '{$this->mTablePrefix}' || asq.sequence_name
 813                                 AND asq.sequence_owner = upper('{$this->mDBname}')
 814                                 AND atc.owner = upper('{$this->mDBname}')" );
 815
 816                         while ( ( $row = $result->fetchRow() ) !== false ) {
 817                                 $this->sequenceData[$row[1]] = [
 818                                         'sequence' => $row[0],
 819                                         'column' => $row[2]
 820                                 ];
 821                         }
 822                 }
 823                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 824
 825                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 826         }
 827
 828         /**
 829          * Returns the size of a text field, or -1 for "unlimited"
 830          *
 831          * @param string $table
 832          * @param string $field
 833          * @return mixed
 834          */
 835         function textFieldSize( $table, $field ) {
 836                 $fieldInfoData = $this->fieldInfo( $table, $field );
 837
 838                 return $fieldInfoData->maxLength();
 839         }
 840
 841         function limitResult( $sql, $limit, $offset = false ) {
 842                 if ( $offset === false ) {
 843                         $offset = 0;
 844                 }
 845
 846                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 847         }
 848
 849         function encodeBlob( $b ) {
 850                 return new Blob( $b );
 851         }
 852
 853         function decodeBlob( $b ) {
 854                 if ( $b instanceof Blob ) {
 855                         $b = $b->fetch();
 856                 }
 857
 858                 return $b;
 859         }
 860
 861         function unionQueries( $sqls, $all ) {
 862                 $glue = ' UNION ALL ';
 863
 864                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 865                         'FROM (' . implode( $glue, $sqls ) . ')';
 866         }
 867
 868         function wasDeadlock() {
 869                 return $this->lastErrno() == 'OCI-00060';
 870         }
 871
 872         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 873                 $fname = __METHOD__
 874         ) {
 875                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 876
 877                 $newName = strtoupper( $newName );
 878                 $oldName = strtoupper( $oldName );
 879
 880                 $tabName = substr( $newName, strlen( $this->mTablePrefix ) );
 881                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 882                 $newPrefix = strtoupper( $this->mTablePrefix );
 883
 884                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 885                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 886         }
 887
 888         function listTables( $prefix = null, $fname = __METHOD__ ) {
 889                 $listWhere = '';
 890                 if ( !empty( $prefix ) ) {
 891                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 892                 }
 893
 894                 $owner = strtoupper( $this->mDBname );
 895                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 896                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 897
 898                 // dirty code ... i know
 899                 $endArray = [];
 900                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 901                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 902                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 903                 $fixedOrderTabs = $endArray;
 904                 while ( ( $row = $result->fetchRow() ) !== false ) {
 905                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 906                                 $endArray[] = $row['table_name'];
 907                         }
 908                 }
 909
 910                 return $endArray;
 911         }
 912
 913         public function dropTable( $tableName, $fName = __METHOD__ ) {
 914                 $tableName = $this->tableName( $tableName );
 915                 if ( !$this->tableExists( $tableName ) ) {
 916                         return false;
 917                 }
 918
 919                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 920         }
 921
 922         function timestamp( $ts = 0 ) {
 923                 return wfTimestamp( TS_ORACLE, $ts );
 924         }
 925
 926         /**
 927          * Return aggregated value function call
 928          *
 929          * @param array $valuedata
 930          * @param string $valuename
 931          * @return mixed
 932          */
 933         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 934                 return $valuedata;
 935         }
 936
 937         /**
 938          * @return string Wikitext of a link to the server software's web site
 939          */
 940         public function getSoftwareLink() {
 941                 return '[{{int:version-db-oracle-url}} Oracle]';
 942         }
 943
 944         /**
 945          * @return string Version information from the database
 946          */
 947         function getServerVersion() {
 948                 // better version number, fallback on driver
 949                 $rset = $this->doQuery(
 950                         'SELECT version FROM product_component_version ' .
 951                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 952                 );
 953                 $row = $rset->fetchRow();
 954                 if ( !$row ) {
 955                         return oci_server_version( $this->mConn );
 956                 }
 957
 958                 return $row['version'];
 959         }
 960
 961         /**
 962          * Query whether a given index exists
 963          * @param string $table
 964          * @param string $index
 965          * @param string $fname
 966          * @return bool
 967          */
 968         function indexExists( $table, $index, $fname = __METHOD__ ) {
 969                 $table = $this->tableName( $table );
 970                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 971                 $index = strtoupper( $index );
 972                 $owner = strtoupper( $this->mDBname );
 973                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 974                 $res = $this->doQuery( $sql );
 975                 if ( $res ) {
 976                         $count = $res->numRows();
 977                         $res->free();
 978                 } else {
 979                         $count = 0;
 980                 }
 981
 982                 return $count != 0;
 983         }
 984
 985         /**
 986          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 987          * @param string $table
 988          * @param string $fname
 989          * @return bool
 990          */
 991         function tableExists( $table, $fname = __METHOD__ ) {
 992                 $table = $this->tableName( $table );
 993                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 994                 $owner = $this->addQuotes( strtoupper( $this->mDBname ) );
 995                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 996                 $res = $this->doQuery( $sql );
 997                 if ( $res && $res->numRows() > 0 ) {
 998                         $exists = true;
 999                 } else {
1000                         $exists = false;
1001                 }
1002
1003                 $res->free();
1004
1005                 return $exists;
1006         }
1007
1008         /**
1009          * Function translates mysql_fetch_field() functionality on ORACLE.
1010          * Caching is present for reducing query time.
1011          * For internal calls. Use fieldInfo for normal usage.
1012          * Returns false if the field doesn't exist
1013          *
1014          * @param array|string $table
1015          * @param string $field
1016          * @return ORAField|ORAResult
1017          */
1018         private function fieldInfoMulti( $table, $field ) {
1019                 $field = strtoupper( $field );
1020                 if ( is_array( $table ) ) {
1021                         $table = array_map( [ &$this, 'tableNameInternal' ], $table );
1022                         $tableWhere = 'IN (';
1023                         foreach ( $table as &$singleTable ) {
1024                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
1025                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
1026                                         return $this->mFieldInfoCache["$singleTable.$field"];
1027                                 }
1028                                 $tableWhere .= '\'' . $singleTable . '\',';
1029                         }
1030                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
1031                 } else {
1032                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
1033                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
1034                                 return $this->mFieldInfoCache["$table.$field"];
1035                         }
1036                         $tableWhere = '= \'' . $table . '\'';
1037                 }
1038
1039                 $fieldInfoStmt = oci_parse(
1040                         $this->mConn,
1041                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
1042                                 $tableWhere . ' and column_name = \'' . $field . '\''
1043                 );
1044                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
1045                         $e = oci_error( $fieldInfoStmt );
1046                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
1047
1048                         return false;
1049                 }
1050                 $res = new ORAResult( $this, $fieldInfoStmt );
1051                 if ( $res->numRows() == 0 ) {
1052                         if ( is_array( $table ) ) {
1053                                 foreach ( $table as &$singleTable ) {
1054                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
1055                                 }
1056                         } else {
1057                                 $this->mFieldInfoCache["$table.$field"] = false;
1058                         }
1059                         $fieldInfoTemp = null;
1060                 } else {
1061                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
1062                         $table = $fieldInfoTemp->tableName();
1063                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
1064                 }
1065                 $res->free();
1066
1067                 return $fieldInfoTemp;
1068         }
1069
1070         /**
1071          * @throws DBUnexpectedError
1072          * @param string $table
1073          * @param string $field
1074          * @return ORAField
1075          */
1076         function fieldInfo( $table, $field ) {
1077                 if ( is_array( $table ) ) {
1078                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
1079                 }
1080
1081                 return $this->fieldInfoMulti( $table, $field );
1082         }
1083
1084         protected function doBegin( $fname = __METHOD__ ) {
1085                 $this->mTrxLevel = 1;
1086                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
1087         }
1088
1089         protected function doCommit( $fname = __METHOD__ ) {
1090                 if ( $this->mTrxLevel ) {
1091                         $ret = oci_commit( $this->mConn );
1092                         if ( !$ret ) {
1093                                 throw new DBUnexpectedError( $this, $this->lastError() );
1094                         }
1095                         $this->mTrxLevel = 0;
1096                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
1097                 }
1098         }
1099
1100         protected function doRollback( $fname = __METHOD__ ) {
1101                 if ( $this->mTrxLevel ) {
1102                         oci_rollback( $this->mConn );
1103                         $this->mTrxLevel = 0;
1104                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
1105                 }
1106         }
1107
1108         /**
1109          * defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
1110          *
1111          * @param resource $fp
1112          * @param bool|string $lineCallback
1113          * @param bool|callable $resultCallback
1114          * @param string $fname
1115          * @param bool|callable $inputCallback
1116          * @return bool|string
1117          */
1118         function sourceStream( $fp, $lineCallback = false, $resultCallback = false,
1119                 $fname = __METHOD__, $inputCallback = false ) {
1120                 $cmd = '';
1121                 $done = false;
1122                 $dollarquote = false;
1123
1124                 $replacements = [];
1125
1126                 while ( !feof( $fp ) ) {
1127                         if ( $lineCallback ) {
1128                                 call_user_func( $lineCallback );
1129                         }
1130                         $line = trim( fgets( $fp, 1024 ) );
1131                         $sl = strlen( $line ) - 1;
1132
1133                         if ( $sl < 0 ) {
1134                                 continue;
1135                         }
1136                         if ( '-' == $line[0] && '-' == $line[1] ) {
1137                                 continue;
1138                         }
1139
1140                         // Allow dollar quoting for function declarations
1141                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
1142                                 if ( $dollarquote ) {
1143                                         $dollarquote = false;
1144                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
1145                                         $done = true;
1146                                 } else {
1147                                         $dollarquote = true;
1148                                 }
1149                         } elseif ( !$dollarquote ) {
1150                                 if ( ';' == $line[$sl] && ( $sl < 2 || ';' != $line[$sl - 1] ) ) {
1151                                         $done = true;
1152                                         $line = substr( $line, 0, $sl );
1153                                 }
1154                         }
1155
1156                         if ( $cmd != '' ) {
1157                                 $cmd .= ' ';
1158                         }
1159                         $cmd .= "$line\n";
1160
1161                         if ( $done ) {
1162                                 $cmd = str_replace( ';;', ";", $cmd );
1163                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1164                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1165                                                 $replacements[$defines[2]] = $defines[1];
1166                                         }
1167                                 } else {
1168                                         foreach ( $replacements as $mwVar => $scVar ) {
1169                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1170                                         }
1171
1172                                         $cmd = $this->replaceVars( $cmd );
1173                                         if ( $inputCallback ) {
1174                                                 call_user_func( $inputCallback, $cmd );
1175                                         }
1176                                         $res = $this->doQuery( $cmd );
1177                                         if ( $resultCallback ) {
1178                                                 call_user_func( $resultCallback, $res, $this );
1179                                         }
1180
1181                                         if ( false === $res ) {
1182                                                 $err = $this->lastError();
1183
1184                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1185                                         }
1186                                 }
1187
1188                                 $cmd = '';
1189                                 $done = false;
1190                         }
1191                 }
1192
1193                 return true;
1194         }
1195
1196         function selectDB( $db ) {
1197                 $this->mDBname = $db;
1198                 if ( $db == null || $db == $this->mUser ) {
1199                         return true;
1200                 }
1201                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper( $db );
1202                 $stmt = oci_parse( $this->mConn, $sql );
1203                 MediaWiki\suppressWarnings();
1204                 $success = oci_execute( $stmt );
1205                 MediaWiki\restoreWarnings();
1206                 if ( !$success ) {
1207                         $e = oci_error( $stmt );
1208                         if ( $e['code'] != '1435' ) {
1209                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1210                         }
1211
1212                         return false;
1213                 }
1214
1215                 return true;
1216         }
1217
1218         function strencode( $s ) {
1219                 return str_replace( "'", "''", $s );
1220         }
1221
1222         function addQuotes( $s ) {
1223                 global $wgContLang;
1224                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1225                         $s = $wgContLang->checkTitleEncoding( $s );
1226                 }
1227
1228                 return "'" . $this->strencode( $s ) . "'";
1229         }
1230
1231         public function addIdentifierQuotes( $s ) {
1232                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1233                         $s = '/*Q*/' . $s;
1234                 }
1235
1236                 return $s;
1237         }
1238
1239         public function removeIdentifierQuotes( $s ) {
1240                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1241         }
1242
1243         public function isQuotedIdentifier( $s ) {
1244                 return strpos( $s, '/*Q*/' ) !== false;
1245         }
1246
1247         private function wrapFieldForWhere( $table, &$col, &$val ) {
1248                 global $wgContLang;
1249
1250                 $col_info = $this->fieldInfoMulti( $table, $col );
1251                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1252                 if ( $col_type == 'CLOB' ) {
1253                         $col = 'TO_CHAR(' . $col . ')';
1254                         $val = $wgContLang->checkTitleEncoding( $val );
1255                 } elseif ( $col_type == 'VARCHAR2' ) {
1256                         $val = $wgContLang->checkTitleEncoding( $val );
1257                 }
1258         }
1259
1260         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1261                 $conds2 = [];
1262                 foreach ( $conds as $col => $val ) {
1263                         if ( is_array( $val ) ) {
1264                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1265                         } else {
1266                                 if ( is_numeric( $col ) && $parentCol != null ) {
1267                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1268                                 } else {
1269                                         $this->wrapFieldForWhere( $table, $col, $val );
1270                                 }
1271                                 $conds2[$col] = $val;
1272                         }
1273                 }
1274
1275                 return $conds2;
1276         }
1277
1278         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1279                 $options = [], $join_conds = []
1280         ) {
1281                 if ( is_array( $conds ) ) {
1282                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1283                 }
1284
1285                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1286         }
1287
1288         /**
1289          * Returns an optional USE INDEX clause to go after the table, and a
1290          * string to go at the end of the query
1291          *
1292          * @param array $options An associative array of options to be turned into
1293          *   an SQL query, valid keys are listed in the function.
1294          * @return array
1295          */
1296         function makeSelectOptions( $options ) {
1297                 $preLimitTail = $postLimitTail = '';
1298                 $startOpts = '';
1299
1300                 $noKeyOptions = [];
1301                 foreach ( $options as $key => $option ) {
1302                         if ( is_numeric( $key ) ) {
1303                                 $noKeyOptions[$option] = true;
1304                         }
1305                 }
1306
1307                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1308
1309                 $preLimitTail .= $this->makeOrderBy( $options );
1310
1311                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1312                         $postLimitTail .= ' FOR UPDATE';
1313                 }
1314
1315                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1316                         $startOpts .= 'DISTINCT';
1317                 }
1318
1319                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1320                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1321                 } else {
1322                         $useIndex = '';
1323                 }
1324
1325                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1326                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1327                 } else {
1328                         $ignoreIndex = '';
1329                 }
1330
1331                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1332         }
1333
1334         public function delete( $table, $conds, $fname = __METHOD__ ) {
1335                 if ( is_array( $conds ) ) {
1336                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1337                 }
1338                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1339                 // all deletions on these tables have transactions so final failure rollbacks these updates
1340                 $table = $this->tableName( $table );
1341                 if ( $table == $this->tableName( 'user' ) ) {
1342                         $this->update( 'archive', [ 'ar_user' => 0 ],
1343                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1344                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1345                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1346                         $this->update( 'image', [ 'img_user' => 0 ],
1347                                 [ 'img_user' => $conds['user_id'] ], $fname );
1348                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1349                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1350                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1351                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1352                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1353                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1354                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1355                                 [ 'us_user' => $conds['user_id'] ], $fname );
1356                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1357                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1358                         $this->update( 'logging', [ 'log_user' => 0 ],
1359                                 [ 'log_user' => $conds['user_id'] ], $fname );
1360                 } elseif ( $table == $this->tableName( 'image' ) ) {
1361                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1362                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1363                 }
1364
1365                 return parent::delete( $table, $conds, $fname );
1366         }
1367
1368         /**
1369          * @param string $table
1370          * @param array $values
1371          * @param array $conds
1372          * @param string $fname
1373          * @param array $options
1374          * @return bool
1375          * @throws DBUnexpectedError
1376          */
1377         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1378                 global $wgContLang;
1379
1380                 $table = $this->tableName( $table );
1381                 $opts = $this->makeUpdateOptions( $options );
1382                 $sql = "UPDATE $opts $table SET ";
1383
1384                 $first = true;
1385                 foreach ( $values as $col => &$val ) {
1386                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1387
1388                         if ( !$first ) {
1389                                 $sqlSet = ', ' . $sqlSet;
1390                         } else {
1391                                 $first = false;
1392                         }
1393                         $sql .= $sqlSet;
1394                 }
1395
1396                 if ( $conds !== [] && $conds !== '*' ) {
1397                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1398                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1399                 }
1400
1401                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
1402                 if ( $stmt === false ) {
1403                         $e = oci_error( $this->mConn );
1404                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1405
1406                         return false;
1407                 }
1408                 foreach ( $values as $col => &$val ) {
1409                         $col_info = $this->fieldInfoMulti( $table, $col );
1410                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1411
1412                         if ( $val === null ) {
1413                                 // do nothing ... null was inserted in statement creation
1414                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1415                                 if ( is_object( $val ) ) {
1416                                         $val = $val->getData();
1417                                 }
1418
1419                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1420                                         $val = '31-12-2030 12:00:00.000000';
1421                                 }
1422
1423                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1424                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1425                                         $e = oci_error( $stmt );
1426                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1427
1428                                         return false;
1429                                 }
1430                         } else {
1431                                 /** @var OCI_Lob[] $lob */
1432                                 $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB );
1433                                 if ( $lob[$col] === false ) {
1434                                         $e = oci_error( $stmt );
1435                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1436                                 }
1437
1438                                 if ( is_object( $val ) ) {
1439                                         $val = $val->getData();
1440                                 }
1441
1442                                 if ( $col_type == 'BLOB' ) {
1443                                         $lob[$col]->writeTemporary( $val );
1444                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1445                                 } else {
1446                                         $lob[$col]->writeTemporary( $val );
1447                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1448                                 }
1449                         }
1450                 }
1451
1452                 MediaWiki\suppressWarnings();
1453
1454                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1455                         $e = oci_error( $stmt );
1456                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1457                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1458
1459                                 return false;
1460                         } else {
1461                                 $this->mAffectedRows = oci_num_rows( $stmt );
1462                         }
1463                 } else {
1464                         $this->mAffectedRows = oci_num_rows( $stmt );
1465                 }
1466
1467                 MediaWiki\restoreWarnings();
1468
1469                 if ( isset( $lob ) ) {
1470                         foreach ( $lob as $lob_v ) {
1471                                 $lob_v->free();
1472                         }
1473                 }
1474
1475                 if ( !$this->mTrxLevel ) {
1476                         oci_commit( $this->mConn );
1477                 }
1478
1479                 return oci_free_statement( $stmt );
1480         }
1481
1482         function bitNot( $field ) {
1483                 // expecting bit-fields smaller than 4bytes
1484                 return 'BITNOT(' . $field . ')';
1485         }
1486
1487         function bitAnd( $fieldLeft, $fieldRight ) {
1488                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1489         }
1490
1491         function bitOr( $fieldLeft, $fieldRight ) {
1492                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1493         }
1494
1495         function getDBname() {
1496                 return $this->mDBname;
1497         }
1498
1499         function getServer() {
1500                 return $this->mServer;
1501         }
1502
1503         public function buildGroupConcatField(
1504                 $delim, $table, $field, $conds = '', $join_conds = []
1505         ) {
1506                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1507
1508                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1509         }
1510
1511         /**
1512          * @param string $field Field or column to cast
1513          * @return string
1514          * @since 1.28
1515          */
1516         public function buildStringCast( $field ) {
1517                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1518         }
1519
1520         public function getSearchEngine() {
1521                 return 'SearchOracle';
1522         }
1523
1524         public function getInfinity() {
1525                 return '31-12-2030 12:00:00.000000';
1526         }
1527 }