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