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 DatabaseBase $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  * Utility class.
 133  * @ingroup Database
 134  */
 135 class ORAField implements Field {
 136         private $name, $tablename, $default, $max_length, $nullable,
 137                 $is_pk, $is_unique, $is_multiple, $is_key, $type;
 138
 139         function __construct( $info ) {
 140                 $this->name = $info['column_name'];
 141                 $this->tablename = $info['table_name'];
 142                 $this->default = $info['data_default'];
 143                 $this->max_length = $info['data_length'];
 144                 $this->nullable = $info['not_null'];
 145                 $this->is_pk = isset( $info['prim'] ) && $info['prim'] == 1 ? 1 : 0;
 146                 $this->is_unique = isset( $info['uniq'] ) && $info['uniq'] == 1 ? 1 : 0;
 147                 $this->is_multiple = isset( $info['nonuniq'] ) && $info['nonuniq'] == 1 ? 1 : 0;
 148                 $this->is_key = ( $this->is_pk || $this->is_unique || $this->is_multiple );
 149                 $this->type = $info['data_type'];
 150         }
 151
 152         function name() {
 153                 return $this->name;
 154         }
 155
 156         function tableName() {
 157                 return $this->tablename;
 158         }
 159
 160         function defaultValue() {
 161                 return $this->default;
 162         }
 163
 164         function maxLength() {
 165                 return $this->max_length;
 166         }
 167
 168         function isNullable() {
 169                 return $this->nullable;
 170         }
 171
 172         function isKey() {
 173                 return $this->is_key;
 174         }
 175
 176         function isMultipleKey() {
 177                 return $this->is_multiple;
 178         }
 179
 180         function type() {
 181                 return $this->type;
 182         }
 183 }
 184
 185 /**
 186  * @ingroup Database
 187  */
 188 class DatabaseOracle extends Database {
 189         /** @var resource */
 190         protected $mLastResult = null;
 191
 192         /** @var int The number of rows affected as an integer */
 193         protected $mAffectedRows;
 194
 195         /** @var int */
 196         private $mInsertId = null;
 197
 198         /** @var bool */
 199         private $ignoreDupValOnIndex = false;
 200
 201         /** @var bool|array */
 202         private $sequenceData = null;
 203
 204         /** @var string Character set for Oracle database */
 205         private $defaultCharset = 'AL32UTF8';
 206
 207         /** @var array */
 208         private $mFieldInfoCache = [];
 209
 210         function __construct( array $p ) {
 211                 global $wgDBprefix;
 212
 213                 if ( $p['tablePrefix'] == 'get from global' ) {
 214                         $p['tablePrefix'] = $wgDBprefix;
 215                 }
 216                 $p['tablePrefix'] = strtoupper( $p['tablePrefix'] );
 217                 parent::__construct( $p );
 218                 Hooks::run( 'DatabaseOraclePostInit', [ $this ] );
 219         }
 220
 221         function __destruct() {
 222                 if ( $this->mOpened ) {
 223                         MediaWiki\suppressWarnings();
 224                         $this->close();
 225                         MediaWiki\restoreWarnings();
 226                 }
 227         }
 228
 229         function getType() {
 230                 return 'oracle';
 231         }
 232
 233         function cascadingDeletes() {
 234                 return true;
 235         }
 236
 237         function cleanupTriggers() {
 238                 return true;
 239         }
 240
 241         function strictIPs() {
 242                 return true;
 243         }
 244
 245         function realTimestamps() {
 246                 return true;
 247         }
 248
 249         function implicitGroupby() {
 250                 return false;
 251         }
 252
 253         function implicitOrderby() {
 254                 return false;
 255         }
 256
 257         function searchableIPs() {
 258                 return true;
 259         }
 260
 261         /**
 262          * Usually aborts on failure
 263          * @param string $server
 264          * @param string $user
 265          * @param string $password
 266          * @param string $dbName
 267          * @throws DBConnectionError
 268          * @return DatabaseBase|null
 269          */
 270         function open( $server, $user, $password, $dbName ) {
 271                 global $wgDBOracleDRCP;
 272                 if ( !function_exists( 'oci_connect' ) ) {
 273                         throw new DBConnectionError(
 274                                 $this,
 275                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
 276                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
 277                                         "and database)\n" );
 278                 }
 279
 280                 $this->close();
 281                 $this->mUser = $user;
 282                 $this->mPassword = $password;
 283                 // changed internal variables functions
 284                 // mServer now holds the TNS endpoint
 285                 // mDBname is schema name if different from username
 286                 if ( !$server ) {
 287                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 288                         $this->mServer = $dbName;
 289                         $this->mDBname = $user;
 290                 } else {
 291                         $this->mServer = $server;
 292                         if ( !$dbName ) {
 293                                 $this->mDBname = $user;
 294                         } else {
 295                                 $this->mDBname = $dbName;
 296                         }
 297                 }
 298
 299                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 300                         return null;
 301                 }
 302
 303                 if ( $wgDBOracleDRCP ) {
 304                         $this->setFlag( DBO_PERSISTENT );
 305                 }
 306
 307                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 308
 309                 MediaWiki\suppressWarnings();
 310                 if ( $this->mFlags & DBO_PERSISTENT ) {
 311                         $this->mConn = oci_pconnect(
 312                                 $this->mUser,
 313                                 $this->mPassword,
 314                                 $this->mServer,
 315                                 $this->defaultCharset,
 316                                 $session_mode
 317                         );
 318                 } elseif ( $this->mFlags & DBO_DEFAULT ) {
 319                         $this->mConn = oci_new_connect(
 320                                 $this->mUser,
 321                                 $this->mPassword,
 322                                 $this->mServer,
 323                                 $this->defaultCharset,
 324                                 $session_mode
 325                         );
 326                 } else {
 327                         $this->mConn = oci_connect(
 328                                 $this->mUser,
 329                                 $this->mPassword,
 330                                 $this->mServer,
 331                                 $this->defaultCharset,
 332                                 $session_mode
 333                         );
 334                 }
 335                 MediaWiki\restoreWarnings();
 336
 337                 if ( $this->mUser != $this->mDBname ) {
 338                         // change current schema in session
 339                         $this->selectDB( $this->mDBname );
 340                 }
 341
 342                 if ( !$this->mConn ) {
 343                         throw new DBConnectionError( $this, $this->lastError() );
 344                 }
 345
 346                 $this->mOpened = true;
 347
 348                 # removed putenv calls because they interfere with the system globaly
 349                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 350                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 351                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 352
 353                 return $this->mConn;
 354         }
 355
 356         /**
 357          * Closes a database connection, if it is open
 358          * Returns success, true if already closed
 359          * @return bool
 360          */
 361         protected function closeConnection() {
 362                 return oci_close( $this->mConn );
 363         }
 364
 365         function execFlags() {
 366                 return $this->mTrxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 367         }
 368
 369         protected function doQuery( $sql ) {
 370                 wfDebug( "SQL: [$sql]\n" );
 371                 if ( !StringUtils::isUtf8( $sql ) ) {
 372                         throw new MWException( "SQL encoding is invalid\n$sql" );
 373                 }
 374
 375                 // handle some oracle specifics
 376                 // remove AS column/table/subquery namings
 377                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 378                         $sql = preg_replace( '/ as /i', ' ', $sql );
 379                 }
 380
 381                 // Oracle has issues with UNION clause if the statement includes LOB fields
 382                 // So we do a UNION ALL and then filter the results array with array_unique
 383                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 384                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 385                 // you have to select data from plan table after explain
 386                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 387
 388                 $sql = preg_replace(
 389                         '/^EXPLAIN /',
 390                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 391                         $sql,
 392                         1,
 393                         $explain_count
 394                 );
 395
 396                 MediaWiki\suppressWarnings();
 397
 398                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
 399                 if ( $stmt === false ) {
 400                         $e = oci_error( $this->mConn );
 401                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 402
 403                         return false;
 404                 }
 405
 406                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 407                         $e = oci_error( $stmt );
 408                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 409                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 410
 411                                 return false;
 412                         }
 413                 }
 414
 415                 MediaWiki\restoreWarnings();
 416
 417                 if ( $explain_count > 0 ) {
 418                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 419                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 420                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 421                         return new ORAResult( $this, $stmt, $union_unique );
 422                 } else {
 423                         $this->mAffectedRows = oci_num_rows( $stmt );
 424
 425                         return true;
 426                 }
 427         }
 428
 429         function queryIgnore( $sql, $fname = '' ) {
 430                 return $this->query( $sql, $fname, true );
 431         }
 432
 433         /**
 434          * Frees resources associated with the LOB descriptor
 435          * @param ResultWrapper|resource $res
 436          */
 437         function freeResult( $res ) {
 438                 if ( $res instanceof ResultWrapper ) {
 439                         $res = $res->result;
 440                 }
 441
 442                 $res->free();
 443         }
 444
 445         /**
 446          * @param ResultWrapper|stdClass $res
 447          * @return mixed
 448          */
 449         function fetchObject( $res ) {
 450                 if ( $res instanceof ResultWrapper ) {
 451                         $res = $res->result;
 452                 }
 453
 454                 return $res->fetchObject();
 455         }
 456
 457         function fetchRow( $res ) {
 458                 if ( $res instanceof ResultWrapper ) {
 459                         $res = $res->result;
 460                 }
 461
 462                 return $res->fetchRow();
 463         }
 464
 465         function numRows( $res ) {
 466                 if ( $res instanceof ResultWrapper ) {
 467                         $res = $res->result;
 468                 }
 469
 470                 return $res->numRows();
 471         }
 472
 473         function numFields( $res ) {
 474                 if ( $res instanceof ResultWrapper ) {
 475                         $res = $res->result;
 476                 }
 477
 478                 return $res->numFields();
 479         }
 480
 481         function fieldName( $stmt, $n ) {
 482                 return oci_field_name( $stmt, $n );
 483         }
 484
 485         /**
 486          * This must be called after nextSequenceVal
 487          * @return null|int
 488          */
 489         function insertId() {
 490                 return $this->mInsertId;
 491         }
 492
 493         /**
 494          * @param mixed $res
 495          * @param int $row
 496          */
 497         function dataSeek( $res, $row ) {
 498                 if ( $res instanceof ORAResult ) {
 499                         $res->seek( $row );
 500                 } else {
 501                         $res->result->seek( $row );
 502                 }
 503         }
 504
 505         function lastError() {
 506                 if ( $this->mConn === false ) {
 507                         $e = oci_error();
 508                 } else {
 509                         $e = oci_error( $this->mConn );
 510                 }
 511
 512                 return $e['message'];
 513         }
 514
 515         function lastErrno() {
 516                 if ( $this->mConn === false ) {
 517                         $e = oci_error();
 518                 } else {
 519                         $e = oci_error( $this->mConn );
 520                 }
 521
 522                 return $e['code'];
 523         }
 524
 525         function affectedRows() {
 526                 return $this->mAffectedRows;
 527         }
 528
 529         /**
 530          * Returns information about an index
 531          * If errors are explicitly ignored, returns NULL on failure
 532          * @param string $table
 533          * @param string $index
 534          * @param string $fname
 535          * @return bool
 536          */
 537         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 538                 return false;
 539         }
 540
 541         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 542                 return false;
 543         }
 544
 545         function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 546                 if ( !count( $a ) ) {
 547                         return true;
 548                 }
 549
 550                 if ( !is_array( $options ) ) {
 551                         $options = [ $options ];
 552                 }
 553
 554                 if ( in_array( 'IGNORE', $options ) ) {
 555                         $this->ignoreDupValOnIndex = true;
 556                 }
 557
 558                 if ( !is_array( reset( $a ) ) ) {
 559                         $a = [ $a ];
 560                 }
 561
 562                 foreach ( $a as &$row ) {
 563                         $this->insertOneRow( $table, $row, $fname );
 564                 }
 565                 $retVal = true;
 566
 567                 if ( in_array( 'IGNORE', $options ) ) {
 568                         $this->ignoreDupValOnIndex = false;
 569                 }
 570
 571                 return $retVal;
 572         }
 573
 574         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 575                 $col_info = $this->fieldInfoMulti( $table, $col );
 576                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 577
 578                 $bind = '';
 579                 if ( is_numeric( $col ) ) {
 580                         $bind = $val;
 581                         $val = null;
 582
 583                         return $bind;
 584                 } elseif ( $includeCol ) {
 585                         $bind = "$col = ";
 586                 }
 587
 588                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 589                         $val = null;
 590                 }
 591
 592                 if ( $val === 'NULL' ) {
 593                         $val = null;
 594                 }
 595
 596                 if ( $val === null ) {
 597                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 598                                 $bind .= 'DEFAULT';
 599                         } else {
 600                                 $bind .= 'NULL';
 601                         }
 602                 } else {
 603                         $bind .= ':' . $col;
 604                 }
 605
 606                 return $bind;
 607         }
 608
 609         /**
 610          * @param string $table
 611          * @param array $row
 612          * @param string $fname
 613          * @return bool
 614          * @throws DBUnexpectedError
 615          */
 616         private function insertOneRow( $table, $row, $fname ) {
 617                 global $wgContLang;
 618
 619                 $table = $this->tableName( $table );
 620                 // "INSERT INTO tables (a, b, c)"
 621                 $sql = "INSERT INTO " . $table . " (" . implode( ',', array_keys( $row ) ) . ')';
 622                 $sql .= " VALUES (";
 623
 624                 // for each value, append ":key"
 625                 $first = true;
 626                 foreach ( $row as $col => &$val ) {
 627                         if ( !$first ) {
 628                                 $sql .= ', ';
 629                         } else {
 630                                 $first = false;
 631                         }
 632                         if ( $this->isQuotedIdentifier( $val ) ) {
 633                                 $sql .= $this->removeIdentifierQuotes( $val );
 634                                 unset( $row[$col] );
 635                         } else {
 636                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 637                         }
 638                 }
 639                 $sql .= ')';
 640
 641                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
 642                 if ( $stmt === false ) {
 643                         $e = oci_error( $this->mConn );
 644                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 645
 646                         return false;
 647                 }
 648                 foreach ( $row as $col => &$val ) {
 649                         $col_info = $this->fieldInfoMulti( $table, $col );
 650                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 651
 652                         if ( $val === null ) {
 653                                 // do nothing ... null was inserted in statement creation
 654                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 655                                 if ( is_object( $val ) ) {
 656                                         $val = $val->fetch();
 657                                 }
 658
 659                                 // backward compatibility
 660                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 661                                         $val = $this->getInfinity();
 662                                 }
 663
 664                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 665                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 666                                         $e = oci_error( $stmt );
 667                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 668
 669                                         return false;
 670                                 }
 671                         } else {
 672                                 /** @var OCI_Lob[] $lob */
 673                                 $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB );
 674                                 if ( $lob[$col] === false ) {
 675                                         $e = oci_error( $stmt );
 676                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 677                                 }
 678
 679                                 if ( is_object( $val ) ) {
 680                                         $val = $val->fetch();
 681                                 }
 682
 683                                 if ( $col_type == 'BLOB' ) {
 684                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 685                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 686                                 } else {
 687                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 688                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 689                                 }
 690                         }
 691                 }
 692
 693                 MediaWiki\suppressWarnings();
 694
 695                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 696                         $e = oci_error( $stmt );
 697                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 698                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 699
 700                                 return false;
 701                         } else {
 702                                 $this->mAffectedRows = oci_num_rows( $stmt );
 703                         }
 704                 } else {
 705                         $this->mAffectedRows = oci_num_rows( $stmt );
 706                 }
 707
 708                 MediaWiki\restoreWarnings();
 709
 710                 if ( isset( $lob ) ) {
 711                         foreach ( $lob as $lob_v ) {
 712                                 $lob_v->free();
 713                         }
 714                 }
 715
 716                 if ( !$this->mTrxLevel ) {
 717                         oci_commit( $this->mConn );
 718                 }
 719
 720                 return oci_free_statement( $stmt );
 721         }
 722
 723         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 724                 $insertOptions = [], $selectOptions = []
 725         ) {
 726                 $destTable = $this->tableName( $destTable );
 727                 if ( !is_array( $selectOptions ) ) {
 728                         $selectOptions = [ $selectOptions ];
 729                 }
 730                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 731                 if ( is_array( $srcTable ) ) {
 732                         $srcTable = implode( ',', array_map( [ &$this, 'tableName' ], $srcTable ) );
 733                 } else {
 734                         $srcTable = $this->tableName( $srcTable );
 735                 }
 736
 737                 $sequenceData = $this->getSequenceData( $destTable );
 738                 if ( $sequenceData !== false &&
 739                         !isset( $varMap[$sequenceData['column']] )
 740                 ) {
 741                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 742                 }
 743
 744                 // count-alias subselect fields to avoid abigious definition errors
 745                 $i = 0;
 746                 foreach ( $varMap as &$val ) {
 747                         $val = $val . ' field' . ( $i++ );
 748                 }
 749
 750                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 751                         " SELECT $startOpts " . implode( ',', $varMap ) .
 752                         " FROM $srcTable $useIndex ";
 753                 if ( $conds != '*' ) {
 754                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 755                 }
 756                 $sql .= " $tailOpts";
 757
 758                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 759                         $this->ignoreDupValOnIndex = true;
 760                 }
 761
 762                 $retval = $this->query( $sql, $fname );
 763
 764                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 765                         $this->ignoreDupValOnIndex = false;
 766                 }
 767
 768                 return $retval;
 769         }
 770
 771         public function upsert( $table, array $rows, array $uniqueIndexes, array $set,
 772                 $fname = __METHOD__
 773         ) {
 774                 if ( !count( $rows ) ) {
 775                         return true; // nothing to do
 776                 }
 777
 778                 if ( !is_array( reset( $rows ) ) ) {
 779                         $rows = [ $rows ];
 780                 }
 781
 782                 $sequenceData = $this->getSequenceData( $table );
 783                 if ( $sequenceData !== false ) {
 784                         // add sequence column to each list of columns, when not set
 785                         foreach ( $rows as &$row ) {
 786                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 787                                         $row[$sequenceData['column']] =
 788                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 789                                                         $sequenceData['sequence'] . '\')' );
 790                                 }
 791                         }
 792                 }
 793
 794                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 795         }
 796
 797         function tableName( $name, $format = 'quoted' ) {
 798                 /*
 799                 Replace reserved words with better ones
 800                 Using uppercase because that's the only way Oracle can handle
 801                 quoted tablenames
 802                 */
 803                 switch ( $name ) {
 804                         case 'user':
 805                                 $name = 'MWUSER';
 806                                 break;
 807                         case 'text':
 808                                 $name = 'PAGECONTENT';
 809                                 break;
 810                 }
 811
 812                 return strtoupper( parent::tableName( $name, $format ) );
 813         }
 814
 815         function tableNameInternal( $name ) {
 816                 $name = $this->tableName( $name );
 817
 818                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 819         }
 820
 821         /**
 822          * Return the next in a sequence, save the value for retrieval via insertId()
 823          *
 824          * @param string $seqName
 825          * @return null|int
 826          */
 827         function nextSequenceValue( $seqName ) {
 828                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 829                 $row = $this->fetchRow( $res );
 830                 $this->mInsertId = $row[0];
 831
 832                 return $this->mInsertId;
 833         }
 834
 835         /**
 836          * Return sequence_name if table has a sequence
 837          *
 838          * @param string $table
 839          * @return bool
 840          */
 841         private function getSequenceData( $table ) {
 842                 if ( $this->sequenceData == null ) {
 843                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 844                                 lower(atc.table_name),
 845                                 lower(atc.column_name)
 846                         FROM all_sequences asq, all_tab_columns atc
 847                         WHERE decode(
 848                                         atc.table_name,
 849                                         '{$this->mTablePrefix}MWUSER',
 850                                         '{$this->mTablePrefix}USER',
 851                                         atc.table_name
 852                                 ) || '_' ||
 853                                 atc.column_name || '_SEQ' = '{$this->mTablePrefix}' || asq.sequence_name
 854                                 AND asq.sequence_owner = upper('{$this->mDBname}')
 855                                 AND atc.owner = upper('{$this->mDBname}')" );
 856
 857                         while ( ( $row = $result->fetchRow() ) !== false ) {
 858                                 $this->sequenceData[$row[1]] = [
 859                                         'sequence' => $row[0],
 860                                         'column' => $row[2]
 861                                 ];
 862                         }
 863                 }
 864                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 865
 866                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 867         }
 868
 869         /**
 870          * Returns the size of a text field, or -1 for "unlimited"
 871          *
 872          * @param string $table
 873          * @param string $field
 874          * @return mixed
 875          */
 876         function textFieldSize( $table, $field ) {
 877                 $fieldInfoData = $this->fieldInfo( $table, $field );
 878
 879                 return $fieldInfoData->maxLength();
 880         }
 881
 882         function limitResult( $sql, $limit, $offset = false ) {
 883                 if ( $offset === false ) {
 884                         $offset = 0;
 885                 }
 886
 887                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 888         }
 889
 890         function encodeBlob( $b ) {
 891                 return new Blob( $b );
 892         }
 893
 894         function decodeBlob( $b ) {
 895                 if ( $b instanceof Blob ) {
 896                         $b = $b->fetch();
 897                 }
 898
 899                 return $b;
 900         }
 901
 902         function unionQueries( $sqls, $all ) {
 903                 $glue = ' UNION ALL ';
 904
 905                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 906                         'FROM (' . implode( $glue, $sqls ) . ')';
 907         }
 908
 909         function wasDeadlock() {
 910                 return $this->lastErrno() == 'OCI-00060';
 911         }
 912
 913         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 914                 $fname = __METHOD__
 915         ) {
 916                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 917
 918                 $newName = strtoupper( $newName );
 919                 $oldName = strtoupper( $oldName );
 920
 921                 $tabName = substr( $newName, strlen( $this->mTablePrefix ) );
 922                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 923                 $newPrefix = strtoupper( $this->mTablePrefix );
 924
 925                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 926                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 927         }
 928
 929         function listTables( $prefix = null, $fname = __METHOD__ ) {
 930                 $listWhere = '';
 931                 if ( !empty( $prefix ) ) {
 932                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 933                 }
 934
 935                 $owner = strtoupper( $this->mDBname );
 936                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 937                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 938
 939                 // dirty code ... i know
 940                 $endArray = [];
 941                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 942                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 943                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 944                 $fixedOrderTabs = $endArray;
 945                 while ( ( $row = $result->fetchRow() ) !== false ) {
 946                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 947                                 $endArray[] = $row['table_name'];
 948                         }
 949                 }
 950
 951                 return $endArray;
 952         }
 953
 954         public function dropTable( $tableName, $fName = __METHOD__ ) {
 955                 $tableName = $this->tableName( $tableName );
 956                 if ( !$this->tableExists( $tableName ) ) {
 957                         return false;
 958                 }
 959
 960                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 961         }
 962
 963         function timestamp( $ts = 0 ) {
 964                 return wfTimestamp( TS_ORACLE, $ts );
 965         }
 966
 967         /**
 968          * Return aggregated value function call
 969          *
 970          * @param array $valuedata
 971          * @param string $valuename
 972          * @return mixed
 973          */
 974         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 975                 return $valuedata;
 976         }
 977
 978         /**
 979          * @return string Wikitext of a link to the server software's web site
 980          */
 981         public function getSoftwareLink() {
 982                 return '[{{int:version-db-oracle-url}} Oracle]';
 983         }
 984
 985         /**
 986          * @return string Version information from the database
 987          */
 988         function getServerVersion() {
 989                 // better version number, fallback on driver
 990                 $rset = $this->doQuery(
 991                         'SELECT version FROM product_component_version ' .
 992                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 993                 );
 994                 $row = $rset->fetchRow();
 995                 if ( !$row ) {
 996                         return oci_server_version( $this->mConn );
 997                 }
 998
 999                 return $row['version'];
1000         }
1001
1002         /**
1003          * Query whether a given index exists
1004          * @param string $table
1005          * @param string $index
1006          * @param string $fname
1007          * @return bool
1008          */
1009         function indexExists( $table, $index, $fname = __METHOD__ ) {
1010                 $table = $this->tableName( $table );
1011                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
1012                 $index = strtoupper( $index );
1013                 $owner = strtoupper( $this->mDBname );
1014                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
1015                 $res = $this->doQuery( $sql );
1016                 if ( $res ) {
1017                         $count = $res->numRows();
1018                         $res->free();
1019                 } else {
1020                         $count = 0;
1021                 }
1022
1023                 return $count != 0;
1024         }
1025
1026         /**
1027          * Query whether a given table exists (in the given schema, or the default mw one if not given)
1028          * @param string $table
1029          * @param string $fname
1030          * @return bool
1031          */
1032         function tableExists( $table, $fname = __METHOD__ ) {
1033                 $table = $this->tableName( $table );
1034                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
1035                 $owner = $this->addQuotes( strtoupper( $this->mDBname ) );
1036                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
1037                 $res = $this->doQuery( $sql );
1038                 if ( $res && $res->numRows() > 0 ) {
1039                         $exists = true;
1040                 } else {
1041                         $exists = false;
1042                 }
1043
1044                 $res->free();
1045
1046                 return $exists;
1047         }
1048
1049         /**
1050          * Function translates mysql_fetch_field() functionality on ORACLE.
1051          * Caching is present for reducing query time.
1052          * For internal calls. Use fieldInfo for normal usage.
1053          * Returns false if the field doesn't exist
1054          *
1055          * @param array|string $table
1056          * @param string $field
1057          * @return ORAField|ORAResult
1058          */
1059         private function fieldInfoMulti( $table, $field ) {
1060                 $field = strtoupper( $field );
1061                 if ( is_array( $table ) ) {
1062                         $table = array_map( [ &$this, 'tableNameInternal' ], $table );
1063                         $tableWhere = 'IN (';
1064                         foreach ( $table as &$singleTable ) {
1065                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
1066                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
1067                                         return $this->mFieldInfoCache["$singleTable.$field"];
1068                                 }
1069                                 $tableWhere .= '\'' . $singleTable . '\',';
1070                         }
1071                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
1072                 } else {
1073                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
1074                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
1075                                 return $this->mFieldInfoCache["$table.$field"];
1076                         }
1077                         $tableWhere = '= \'' . $table . '\'';
1078                 }
1079
1080                 $fieldInfoStmt = oci_parse(
1081                         $this->mConn,
1082                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
1083                                 $tableWhere . ' and column_name = \'' . $field . '\''
1084                 );
1085                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
1086                         $e = oci_error( $fieldInfoStmt );
1087                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
1088
1089                         return false;
1090                 }
1091                 $res = new ORAResult( $this, $fieldInfoStmt );
1092                 if ( $res->numRows() == 0 ) {
1093                         if ( is_array( $table ) ) {
1094                                 foreach ( $table as &$singleTable ) {
1095                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
1096                                 }
1097                         } else {
1098                                 $this->mFieldInfoCache["$table.$field"] = false;
1099                         }
1100                         $fieldInfoTemp = null;
1101                 } else {
1102                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
1103                         $table = $fieldInfoTemp->tableName();
1104                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
1105                 }
1106                 $res->free();
1107
1108                 return $fieldInfoTemp;
1109         }
1110
1111         /**
1112          * @throws DBUnexpectedError
1113          * @param string $table
1114          * @param string $field
1115          * @return ORAField
1116          */
1117         function fieldInfo( $table, $field ) {
1118                 if ( is_array( $table ) ) {
1119                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
1120                 }
1121
1122                 return $this->fieldInfoMulti( $table, $field );
1123         }
1124
1125         protected function doBegin( $fname = __METHOD__ ) {
1126                 $this->mTrxLevel = 1;
1127                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
1128         }
1129
1130         protected function doCommit( $fname = __METHOD__ ) {
1131                 if ( $this->mTrxLevel ) {
1132                         $ret = oci_commit( $this->mConn );
1133                         if ( !$ret ) {
1134                                 throw new DBUnexpectedError( $this, $this->lastError() );
1135                         }
1136                         $this->mTrxLevel = 0;
1137                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
1138                 }
1139         }
1140
1141         protected function doRollback( $fname = __METHOD__ ) {
1142                 if ( $this->mTrxLevel ) {
1143                         oci_rollback( $this->mConn );
1144                         $this->mTrxLevel = 0;
1145                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
1146                 }
1147         }
1148
1149         /**
1150          * defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
1151          *
1152          * @param resource $fp
1153          * @param bool|string $lineCallback
1154          * @param bool|callable $resultCallback
1155          * @param string $fname
1156          * @param bool|callable $inputCallback
1157          * @return bool|string
1158          */
1159         function sourceStream( $fp, $lineCallback = false, $resultCallback = false,
1160                 $fname = __METHOD__, $inputCallback = false ) {
1161                 $cmd = '';
1162                 $done = false;
1163                 $dollarquote = false;
1164
1165                 $replacements = [];
1166
1167                 while ( !feof( $fp ) ) {
1168                         if ( $lineCallback ) {
1169                                 call_user_func( $lineCallback );
1170                         }
1171                         $line = trim( fgets( $fp, 1024 ) );
1172                         $sl = strlen( $line ) - 1;
1173
1174                         if ( $sl < 0 ) {
1175                                 continue;
1176                         }
1177                         if ( '-' == $line[0] && '-' == $line[1] ) {
1178                                 continue;
1179                         }
1180
1181                         // Allow dollar quoting for function declarations
1182                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
1183                                 if ( $dollarquote ) {
1184                                         $dollarquote = false;
1185                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
1186                                         $done = true;
1187                                 } else {
1188                                         $dollarquote = true;
1189                                 }
1190                         } elseif ( !$dollarquote ) {
1191                                 if ( ';' == $line[$sl] && ( $sl < 2 || ';' != $line[$sl - 1] ) ) {
1192                                         $done = true;
1193                                         $line = substr( $line, 0, $sl );
1194                                 }
1195                         }
1196
1197                         if ( $cmd != '' ) {
1198                                 $cmd .= ' ';
1199                         }
1200                         $cmd .= "$line\n";
1201
1202                         if ( $done ) {
1203                                 $cmd = str_replace( ';;', ";", $cmd );
1204                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1205                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1206                                                 $replacements[$defines[2]] = $defines[1];
1207                                         }
1208                                 } else {
1209                                         foreach ( $replacements as $mwVar => $scVar ) {
1210                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1211                                         }
1212
1213                                         $cmd = $this->replaceVars( $cmd );
1214                                         if ( $inputCallback ) {
1215                                                 call_user_func( $inputCallback, $cmd );
1216                                         }
1217                                         $res = $this->doQuery( $cmd );
1218                                         if ( $resultCallback ) {
1219                                                 call_user_func( $resultCallback, $res, $this );
1220                                         }
1221
1222                                         if ( false === $res ) {
1223                                                 $err = $this->lastError();
1224
1225                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1226                                         }
1227                                 }
1228
1229                                 $cmd = '';
1230                                 $done = false;
1231                         }
1232                 }
1233
1234                 return true;
1235         }
1236
1237         function selectDB( $db ) {
1238                 $this->mDBname = $db;
1239                 if ( $db == null || $db == $this->mUser ) {
1240                         return true;
1241                 }
1242                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper( $db );
1243                 $stmt = oci_parse( $this->mConn, $sql );
1244                 MediaWiki\suppressWarnings();
1245                 $success = oci_execute( $stmt );
1246                 MediaWiki\restoreWarnings();
1247                 if ( !$success ) {
1248                         $e = oci_error( $stmt );
1249                         if ( $e['code'] != '1435' ) {
1250                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1251                         }
1252
1253                         return false;
1254                 }
1255
1256                 return true;
1257         }
1258
1259         function strencode( $s ) {
1260                 return str_replace( "'", "''", $s );
1261         }
1262
1263         function addQuotes( $s ) {
1264                 global $wgContLang;
1265                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1266                         $s = $wgContLang->checkTitleEncoding( $s );
1267                 }
1268
1269                 return "'" . $this->strencode( $s ) . "'";
1270         }
1271
1272         public function addIdentifierQuotes( $s ) {
1273                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1274                         $s = '/*Q*/' . $s;
1275                 }
1276
1277                 return $s;
1278         }
1279
1280         public function removeIdentifierQuotes( $s ) {
1281                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1282         }
1283
1284         public function isQuotedIdentifier( $s ) {
1285                 return strpos( $s, '/*Q*/' ) !== false;
1286         }
1287
1288         private function wrapFieldForWhere( $table, &$col, &$val ) {
1289                 global $wgContLang;
1290
1291                 $col_info = $this->fieldInfoMulti( $table, $col );
1292                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1293                 if ( $col_type == 'CLOB' ) {
1294                         $col = 'TO_CHAR(' . $col . ')';
1295                         $val = $wgContLang->checkTitleEncoding( $val );
1296                 } elseif ( $col_type == 'VARCHAR2' ) {
1297                         $val = $wgContLang->checkTitleEncoding( $val );
1298                 }
1299         }
1300
1301         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1302                 $conds2 = [];
1303                 foreach ( $conds as $col => $val ) {
1304                         if ( is_array( $val ) ) {
1305                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1306                         } else {
1307                                 if ( is_numeric( $col ) && $parentCol != null ) {
1308                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1309                                 } else {
1310                                         $this->wrapFieldForWhere( $table, $col, $val );
1311                                 }
1312                                 $conds2[$col] = $val;
1313                         }
1314                 }
1315
1316                 return $conds2;
1317         }
1318
1319         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1320                 $options = [], $join_conds = []
1321         ) {
1322                 if ( is_array( $conds ) ) {
1323                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1324                 }
1325
1326                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1327         }
1328
1329         /**
1330          * Returns an optional USE INDEX clause to go after the table, and a
1331          * string to go at the end of the query
1332          *
1333          * @param array $options An associative array of options to be turned into
1334          *   an SQL query, valid keys are listed in the function.
1335          * @return array
1336          */
1337         function makeSelectOptions( $options ) {
1338                 $preLimitTail = $postLimitTail = '';
1339                 $startOpts = '';
1340
1341                 $noKeyOptions = [];
1342                 foreach ( $options as $key => $option ) {
1343                         if ( is_numeric( $key ) ) {
1344                                 $noKeyOptions[$option] = true;
1345                         }
1346                 }
1347
1348                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1349
1350                 $preLimitTail .= $this->makeOrderBy( $options );
1351
1352                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1353                         $postLimitTail .= ' FOR UPDATE';
1354                 }
1355
1356                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1357                         $startOpts .= 'DISTINCT';
1358                 }
1359
1360                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1361                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1362                 } else {
1363                         $useIndex = '';
1364                 }
1365
1366                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail ];
1367         }
1368
1369         public function delete( $table, $conds, $fname = __METHOD__ ) {
1370                 if ( is_array( $conds ) ) {
1371                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1372                 }
1373                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1374                 // all deletions on these tables have transactions so final failure rollbacks these updates
1375                 $table = $this->tableName( $table );
1376                 if ( $table == $this->tableName( 'user' ) ) {
1377                         $this->update( 'archive', [ 'ar_user' => 0 ],
1378                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1379                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1380                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1381                         $this->update( 'image', [ 'img_user' => 0 ],
1382                                 [ 'img_user' => $conds['user_id'] ], $fname );
1383                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1384                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1385                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1386                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1387                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1388                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1389                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1390                                 [ 'us_user' => $conds['user_id'] ], $fname );
1391                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1392                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1393                         $this->update( 'logging', [ 'log_user' => 0 ],
1394                                 [ 'log_user' => $conds['user_id'] ], $fname );
1395                 } elseif ( $table == $this->tableName( 'image' ) ) {
1396                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1397                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1398                 }
1399
1400                 return parent::delete( $table, $conds, $fname );
1401         }
1402
1403         /**
1404          * @param string $table
1405          * @param array $values
1406          * @param array $conds
1407          * @param string $fname
1408          * @param array $options
1409          * @return bool
1410          * @throws DBUnexpectedError
1411          */
1412         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1413                 global $wgContLang;
1414
1415                 $table = $this->tableName( $table );
1416                 $opts = $this->makeUpdateOptions( $options );
1417                 $sql = "UPDATE $opts $table SET ";
1418
1419                 $first = true;
1420                 foreach ( $values as $col => &$val ) {
1421                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1422
1423                         if ( !$first ) {
1424                                 $sqlSet = ', ' . $sqlSet;
1425                         } else {
1426                                 $first = false;
1427                         }
1428                         $sql .= $sqlSet;
1429                 }
1430
1431                 if ( $conds !== [] && $conds !== '*' ) {
1432                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1433                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1434                 }
1435
1436                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
1437                 if ( $stmt === false ) {
1438                         $e = oci_error( $this->mConn );
1439                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1440
1441                         return false;
1442                 }
1443                 foreach ( $values as $col => &$val ) {
1444                         $col_info = $this->fieldInfoMulti( $table, $col );
1445                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1446
1447                         if ( $val === null ) {
1448                                 // do nothing ... null was inserted in statement creation
1449                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1450                                 if ( is_object( $val ) ) {
1451                                         $val = $val->getData();
1452                                 }
1453
1454                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1455                                         $val = '31-12-2030 12:00:00.000000';
1456                                 }
1457
1458                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1459                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1460                                         $e = oci_error( $stmt );
1461                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1462
1463                                         return false;
1464                                 }
1465                         } else {
1466                                 /** @var OCI_Lob[] $lob */
1467                                 $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB );
1468                                 if ( $lob[$col] === false ) {
1469                                         $e = oci_error( $stmt );
1470                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1471                                 }
1472
1473                                 if ( is_object( $val ) ) {
1474                                         $val = $val->getData();
1475                                 }
1476
1477                                 if ( $col_type == 'BLOB' ) {
1478                                         $lob[$col]->writeTemporary( $val );
1479                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1480                                 } else {
1481                                         $lob[$col]->writeTemporary( $val );
1482                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1483                                 }
1484                         }
1485                 }
1486
1487                 MediaWiki\suppressWarnings();
1488
1489                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1490                         $e = oci_error( $stmt );
1491                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1492                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1493
1494                                 return false;
1495                         } else {
1496                                 $this->mAffectedRows = oci_num_rows( $stmt );
1497                         }
1498                 } else {
1499                         $this->mAffectedRows = oci_num_rows( $stmt );
1500                 }
1501
1502                 MediaWiki\restoreWarnings();
1503
1504                 if ( isset( $lob ) ) {
1505                         foreach ( $lob as $lob_v ) {
1506                                 $lob_v->free();
1507                         }
1508                 }
1509
1510                 if ( !$this->mTrxLevel ) {
1511                         oci_commit( $this->mConn );
1512                 }
1513
1514                 return oci_free_statement( $stmt );
1515         }
1516
1517         function bitNot( $field ) {
1518                 // expecting bit-fields smaller than 4bytes
1519                 return 'BITNOT(' . $field . ')';
1520         }
1521
1522         function bitAnd( $fieldLeft, $fieldRight ) {
1523                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1524         }
1525
1526         function bitOr( $fieldLeft, $fieldRight ) {
1527                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1528         }
1529
1530         function getDBname() {
1531                 return $this->mDBname;
1532         }
1533
1534         function getServer() {
1535                 return $this->mServer;
1536         }
1537
1538         public function buildGroupConcatField(
1539                 $delim, $table, $field, $conds = '', $join_conds = []
1540         ) {
1541                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1542
1543                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1544         }
1545
1546         public function getSearchEngine() {
1547                 return 'SearchOracle';
1548         }
1549
1550         public function getInfinity() {
1551                 return '31-12-2030 12:00:00.000000';
1552         }
1553 }