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