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