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|ORAResult $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|ORAResult $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         /**
 458          * @param ResultWrapper|ORAResult $res
 459          * @return mixed
 460          */
 461         function fetchRow( $res ) {
 462                 if ( $res instanceof ResultWrapper ) {
 463                         $res = $res->result;
 464                 }
 465
 466                 return $res->fetchRow();
 467         }
 468
 469         /**
 470          * @param ResultWrapper|ORAResult $res
 471          * @return int
 472          */
 473         function numRows( $res ) {
 474                 if ( $res instanceof ResultWrapper ) {
 475                         $res = $res->result;
 476                 }
 477
 478                 return $res->numRows();
 479         }
 480
 481         /**
 482          * @param ResultWrapper|ORAResult $res
 483          * @return int
 484          */
 485         function numFields( $res ) {
 486                 if ( $res instanceof ResultWrapper ) {
 487                         $res = $res->result;
 488                 }
 489
 490                 return $res->numFields();
 491         }
 492
 493         function fieldName( $stmt, $n ) {
 494                 return oci_field_name( $stmt, $n );
 495         }
 496
 497         /**
 498          * This must be called after nextSequenceVal
 499          * @return null|int
 500          */
 501         function insertId() {
 502                 return $this->mInsertId;
 503         }
 504
 505         /**
 506          * @param mixed $res
 507          * @param int $row
 508          */
 509         function dataSeek( $res, $row ) {
 510                 if ( $res instanceof ORAResult ) {
 511                         $res->seek( $row );
 512                 } else {
 513                         $res->result->seek( $row );
 514                 }
 515         }
 516
 517         function lastError() {
 518                 if ( $this->mConn === false ) {
 519                         $e = oci_error();
 520                 } else {
 521                         $e = oci_error( $this->mConn );
 522                 }
 523
 524                 return $e['message'];
 525         }
 526
 527         function lastErrno() {
 528                 if ( $this->mConn === false ) {
 529                         $e = oci_error();
 530                 } else {
 531                         $e = oci_error( $this->mConn );
 532                 }
 533
 534                 return $e['code'];
 535         }
 536
 537         function affectedRows() {
 538                 return $this->mAffectedRows;
 539         }
 540
 541         /**
 542          * Returns information about an index
 543          * If errors are explicitly ignored, returns NULL on failure
 544          * @param string $table
 545          * @param string $index
 546          * @param string $fname
 547          * @return bool
 548          */
 549         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 550                 return false;
 551         }
 552
 553         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 554                 return false;
 555         }
 556
 557         function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 558                 if ( !count( $a ) ) {
 559                         return true;
 560                 }
 561
 562                 if ( !is_array( $options ) ) {
 563                         $options = [ $options ];
 564                 }
 565
 566                 if ( in_array( 'IGNORE', $options ) ) {
 567                         $this->ignoreDupValOnIndex = true;
 568                 }
 569
 570                 if ( !is_array( reset( $a ) ) ) {
 571                         $a = [ $a ];
 572                 }
 573
 574                 foreach ( $a as &$row ) {
 575                         $this->insertOneRow( $table, $row, $fname );
 576                 }
 577                 $retVal = true;
 578
 579                 if ( in_array( 'IGNORE', $options ) ) {
 580                         $this->ignoreDupValOnIndex = false;
 581                 }
 582
 583                 return $retVal;
 584         }
 585
 586         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 587                 $col_info = $this->fieldInfoMulti( $table, $col );
 588                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 589
 590                 $bind = '';
 591                 if ( is_numeric( $col ) ) {
 592                         $bind = $val;
 593                         $val = null;
 594
 595                         return $bind;
 596                 } elseif ( $includeCol ) {
 597                         $bind = "$col = ";
 598                 }
 599
 600                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 601                         $val = null;
 602                 }
 603
 604                 if ( $val === 'NULL' ) {
 605                         $val = null;
 606                 }
 607
 608                 if ( $val === null ) {
 609                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 610                                 $bind .= 'DEFAULT';
 611                         } else {
 612                                 $bind .= 'NULL';
 613                         }
 614                 } else {
 615                         $bind .= ':' . $col;
 616                 }
 617
 618                 return $bind;
 619         }
 620
 621         /**
 622          * @param string $table
 623          * @param array $row
 624          * @param string $fname
 625          * @return bool
 626          * @throws DBUnexpectedError
 627          */
 628         private function insertOneRow( $table, $row, $fname ) {
 629                 global $wgContLang;
 630
 631                 $table = $this->tableName( $table );
 632                 // "INSERT INTO tables (a, b, c)"
 633                 $sql = "INSERT INTO " . $table . " (" . implode( ',', array_keys( $row ) ) . ')';
 634                 $sql .= " VALUES (";
 635
 636                 // for each value, append ":key"
 637                 $first = true;
 638                 foreach ( $row as $col => &$val ) {
 639                         if ( !$first ) {
 640                                 $sql .= ', ';
 641                         } else {
 642                                 $first = false;
 643                         }
 644                         if ( $this->isQuotedIdentifier( $val ) ) {
 645                                 $sql .= $this->removeIdentifierQuotes( $val );
 646                                 unset( $row[$col] );
 647                         } else {
 648                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 649                         }
 650                 }
 651                 $sql .= ')';
 652
 653                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
 654                 if ( $stmt === false ) {
 655                         $e = oci_error( $this->mConn );
 656                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 657
 658                         return false;
 659                 }
 660                 foreach ( $row as $col => &$val ) {
 661                         $col_info = $this->fieldInfoMulti( $table, $col );
 662                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 663
 664                         if ( $val === null ) {
 665                                 // do nothing ... null was inserted in statement creation
 666                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 667                                 if ( is_object( $val ) ) {
 668                                         $val = $val->fetch();
 669                                 }
 670
 671                                 // backward compatibility
 672                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 673                                         $val = $this->getInfinity();
 674                                 }
 675
 676                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 677                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 678                                         $e = oci_error( $stmt );
 679                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 680
 681                                         return false;
 682                                 }
 683                         } else {
 684                                 /** @var OCI_Lob[] $lob */
 685                                 $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB );
 686                                 if ( $lob[$col] === false ) {
 687                                         $e = oci_error( $stmt );
 688                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 689                                 }
 690
 691                                 if ( is_object( $val ) ) {
 692                                         $val = $val->fetch();
 693                                 }
 694
 695                                 if ( $col_type == 'BLOB' ) {
 696                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 697                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 698                                 } else {
 699                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 700                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 701                                 }
 702                         }
 703                 }
 704
 705                 MediaWiki\suppressWarnings();
 706
 707                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 708                         $e = oci_error( $stmt );
 709                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 710                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 711
 712                                 return false;
 713                         } else {
 714                                 $this->mAffectedRows = oci_num_rows( $stmt );
 715                         }
 716                 } else {
 717                         $this->mAffectedRows = oci_num_rows( $stmt );
 718                 }
 719
 720                 MediaWiki\restoreWarnings();
 721
 722                 if ( isset( $lob ) ) {
 723                         foreach ( $lob as $lob_v ) {
 724                                 $lob_v->free();
 725                         }
 726                 }
 727
 728                 if ( !$this->mTrxLevel ) {
 729                         oci_commit( $this->mConn );
 730                 }
 731
 732                 return oci_free_statement( $stmt );
 733         }
 734
 735         function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 736                 $insertOptions = [], $selectOptions = []
 737         ) {
 738                 $destTable = $this->tableName( $destTable );
 739                 if ( !is_array( $selectOptions ) ) {
 740                         $selectOptions = [ $selectOptions ];
 741                 }
 742                 list( $startOpts, $useIndex, $tailOpts, $ignoreIndex ) =
 743                         $this->makeSelectOptions( $selectOptions );
 744                 if ( is_array( $srcTable ) ) {
 745                         $srcTable = implode( ',', array_map( [ &$this, 'tableName' ], $srcTable ) );
 746                 } else {
 747                         $srcTable = $this->tableName( $srcTable );
 748                 }
 749
 750                 $sequenceData = $this->getSequenceData( $destTable );
 751                 if ( $sequenceData !== false &&
 752                         !isset( $varMap[$sequenceData['column']] )
 753                 ) {
 754                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 755                 }
 756
 757                 // count-alias subselect fields to avoid abigious definition errors
 758                 $i = 0;
 759                 foreach ( $varMap as &$val ) {
 760                         $val = $val . ' field' . ( $i++ );
 761                 }
 762
 763                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 764                         " SELECT $startOpts " . implode( ',', $varMap ) .
 765                         " FROM $srcTable $useIndex $ignoreIndex ";
 766                 if ( $conds != '*' ) {
 767                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 768                 }
 769                 $sql .= " $tailOpts";
 770
 771                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 772                         $this->ignoreDupValOnIndex = true;
 773                 }
 774
 775                 $retval = $this->query( $sql, $fname );
 776
 777                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 778                         $this->ignoreDupValOnIndex = false;
 779                 }
 780
 781                 return $retval;
 782         }
 783
 784         public function upsert( $table, array $rows, array $uniqueIndexes, array $set,
 785                 $fname = __METHOD__
 786         ) {
 787                 if ( !count( $rows ) ) {
 788                         return true; // nothing to do
 789                 }
 790
 791                 if ( !is_array( reset( $rows ) ) ) {
 792                         $rows = [ $rows ];
 793                 }
 794
 795                 $sequenceData = $this->getSequenceData( $table );
 796                 if ( $sequenceData !== false ) {
 797                         // add sequence column to each list of columns, when not set
 798                         foreach ( $rows as &$row ) {
 799                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 800                                         $row[$sequenceData['column']] =
 801                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 802                                                         $sequenceData['sequence'] . '\')' );
 803                                 }
 804                         }
 805                 }
 806
 807                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 808         }
 809
 810         function tableName( $name, $format = 'quoted' ) {
 811                 /*
 812                 Replace reserved words with better ones
 813                 Using uppercase because that's the only way Oracle can handle
 814                 quoted tablenames
 815                 */
 816                 switch ( $name ) {
 817                         case 'user':
 818                                 $name = 'MWUSER';
 819                                 break;
 820                         case 'text':
 821                                 $name = 'PAGECONTENT';
 822                                 break;
 823                 }
 824
 825                 return strtoupper( parent::tableName( $name, $format ) );
 826         }
 827
 828         function tableNameInternal( $name ) {
 829                 $name = $this->tableName( $name );
 830
 831                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 832         }
 833
 834         /**
 835          * Return the next in a sequence, save the value for retrieval via insertId()
 836          *
 837          * @param string $seqName
 838          * @return null|int
 839          */
 840         function nextSequenceValue( $seqName ) {
 841                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 842                 $row = $this->fetchRow( $res );
 843                 $this->mInsertId = $row[0];
 844
 845                 return $this->mInsertId;
 846         }
 847
 848         /**
 849          * Return sequence_name if table has a sequence
 850          *
 851          * @param string $table
 852          * @return bool
 853          */
 854         private function getSequenceData( $table ) {
 855                 if ( $this->sequenceData == null ) {
 856                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 857                                 lower(atc.table_name),
 858                                 lower(atc.column_name)
 859                         FROM all_sequences asq, all_tab_columns atc
 860                         WHERE decode(
 861                                         atc.table_name,
 862                                         '{$this->mTablePrefix}MWUSER',
 863                                         '{$this->mTablePrefix}USER',
 864                                         atc.table_name
 865                                 ) || '_' ||
 866                                 atc.column_name || '_SEQ' = '{$this->mTablePrefix}' || asq.sequence_name
 867                                 AND asq.sequence_owner = upper('{$this->mDBname}')
 868                                 AND atc.owner = upper('{$this->mDBname}')" );
 869
 870                         while ( ( $row = $result->fetchRow() ) !== false ) {
 871                                 $this->sequenceData[$row[1]] = [
 872                                         'sequence' => $row[0],
 873                                         'column' => $row[2]
 874                                 ];
 875                         }
 876                 }
 877                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 878
 879                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 880         }
 881
 882         /**
 883          * Returns the size of a text field, or -1 for "unlimited"
 884          *
 885          * @param string $table
 886          * @param string $field
 887          * @return mixed
 888          */
 889         function textFieldSize( $table, $field ) {
 890                 $fieldInfoData = $this->fieldInfo( $table, $field );
 891
 892                 return $fieldInfoData->maxLength();
 893         }
 894
 895         function limitResult( $sql, $limit, $offset = false ) {
 896                 if ( $offset === false ) {
 897                         $offset = 0;
 898                 }
 899
 900                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 901         }
 902
 903         function encodeBlob( $b ) {
 904                 return new Blob( $b );
 905         }
 906
 907         function decodeBlob( $b ) {
 908                 if ( $b instanceof Blob ) {
 909                         $b = $b->fetch();
 910                 }
 911
 912                 return $b;
 913         }
 914
 915         function unionQueries( $sqls, $all ) {
 916                 $glue = ' UNION ALL ';
 917
 918                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 919                         'FROM (' . implode( $glue, $sqls ) . ')';
 920         }
 921
 922         function wasDeadlock() {
 923                 return $this->lastErrno() == 'OCI-00060';
 924         }
 925
 926         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 927                 $fname = __METHOD__
 928         ) {
 929                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 930
 931                 $newName = strtoupper( $newName );
 932                 $oldName = strtoupper( $oldName );
 933
 934                 $tabName = substr( $newName, strlen( $this->mTablePrefix ) );
 935                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 936                 $newPrefix = strtoupper( $this->mTablePrefix );
 937
 938                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 939                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 940         }
 941
 942         function listTables( $prefix = null, $fname = __METHOD__ ) {
 943                 $listWhere = '';
 944                 if ( !empty( $prefix ) ) {
 945                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 946                 }
 947
 948                 $owner = strtoupper( $this->mDBname );
 949                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 950                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 951
 952                 // dirty code ... i know
 953                 $endArray = [];
 954                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 955                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 956                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 957                 $fixedOrderTabs = $endArray;
 958                 while ( ( $row = $result->fetchRow() ) !== false ) {
 959                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 960                                 $endArray[] = $row['table_name'];
 961                         }
 962                 }
 963
 964                 return $endArray;
 965         }
 966
 967         public function dropTable( $tableName, $fName = __METHOD__ ) {
 968                 $tableName = $this->tableName( $tableName );
 969                 if ( !$this->tableExists( $tableName ) ) {
 970                         return false;
 971                 }
 972
 973                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 974         }
 975
 976         function timestamp( $ts = 0 ) {
 977                 return wfTimestamp( TS_ORACLE, $ts );
 978         }
 979
 980         /**
 981          * Return aggregated value function call
 982          *
 983          * @param array $valuedata
 984          * @param string $valuename
 985          * @return mixed
 986          */
 987         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 988                 return $valuedata;
 989         }
 990
 991         /**
 992          * @return string Wikitext of a link to the server software's web site
 993          */
 994         public function getSoftwareLink() {
 995                 return '[{{int:version-db-oracle-url}} Oracle]';
 996         }
 997
 998         /**
 999          * @return string Version information from the database
1000          */
1001         function getServerVersion() {
1002                 // better version number, fallback on driver
1003                 $rset = $this->doQuery(
1004                         'SELECT version FROM product_component_version ' .
1005                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
1006                 );
1007                 $row = $rset->fetchRow();
1008                 if ( !$row ) {
1009                         return oci_server_version( $this->mConn );
1010                 }
1011
1012                 return $row['version'];
1013         }
1014
1015         /**
1016          * Query whether a given index exists
1017          * @param string $table
1018          * @param string $index
1019          * @param string $fname
1020          * @return bool
1021          */
1022         function indexExists( $table, $index, $fname = __METHOD__ ) {
1023                 $table = $this->tableName( $table );
1024                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
1025                 $index = strtoupper( $index );
1026                 $owner = strtoupper( $this->mDBname );
1027                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
1028                 $res = $this->doQuery( $sql );
1029                 if ( $res ) {
1030                         $count = $res->numRows();
1031                         $res->free();
1032                 } else {
1033                         $count = 0;
1034                 }
1035
1036                 return $count != 0;
1037         }
1038
1039         /**
1040          * Query whether a given table exists (in the given schema, or the default mw one if not given)
1041          * @param string $table
1042          * @param string $fname
1043          * @return bool
1044          */
1045         function tableExists( $table, $fname = __METHOD__ ) {
1046                 $table = $this->tableName( $table );
1047                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
1048                 $owner = $this->addQuotes( strtoupper( $this->mDBname ) );
1049                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
1050                 $res = $this->doQuery( $sql );
1051                 if ( $res && $res->numRows() > 0 ) {
1052                         $exists = true;
1053                 } else {
1054                         $exists = false;
1055                 }
1056
1057                 $res->free();
1058
1059                 return $exists;
1060         }
1061
1062         /**
1063          * Function translates mysql_fetch_field() functionality on ORACLE.
1064          * Caching is present for reducing query time.
1065          * For internal calls. Use fieldInfo for normal usage.
1066          * Returns false if the field doesn't exist
1067          *
1068          * @param array|string $table
1069          * @param string $field
1070          * @return ORAField|ORAResult
1071          */
1072         private function fieldInfoMulti( $table, $field ) {
1073                 $field = strtoupper( $field );
1074                 if ( is_array( $table ) ) {
1075                         $table = array_map( [ &$this, 'tableNameInternal' ], $table );
1076                         $tableWhere = 'IN (';
1077                         foreach ( $table as &$singleTable ) {
1078                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
1079                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
1080                                         return $this->mFieldInfoCache["$singleTable.$field"];
1081                                 }
1082                                 $tableWhere .= '\'' . $singleTable . '\',';
1083                         }
1084                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
1085                 } else {
1086                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
1087                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
1088                                 return $this->mFieldInfoCache["$table.$field"];
1089                         }
1090                         $tableWhere = '= \'' . $table . '\'';
1091                 }
1092
1093                 $fieldInfoStmt = oci_parse(
1094                         $this->mConn,
1095                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
1096                                 $tableWhere . ' and column_name = \'' . $field . '\''
1097                 );
1098                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
1099                         $e = oci_error( $fieldInfoStmt );
1100                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
1101
1102                         return false;
1103                 }
1104                 $res = new ORAResult( $this, $fieldInfoStmt );
1105                 if ( $res->numRows() == 0 ) {
1106                         if ( is_array( $table ) ) {
1107                                 foreach ( $table as &$singleTable ) {
1108                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
1109                                 }
1110                         } else {
1111                                 $this->mFieldInfoCache["$table.$field"] = false;
1112                         }
1113                         $fieldInfoTemp = null;
1114                 } else {
1115                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
1116                         $table = $fieldInfoTemp->tableName();
1117                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
1118                 }
1119                 $res->free();
1120
1121                 return $fieldInfoTemp;
1122         }
1123
1124         /**
1125          * @throws DBUnexpectedError
1126          * @param string $table
1127          * @param string $field
1128          * @return ORAField
1129          */
1130         function fieldInfo( $table, $field ) {
1131                 if ( is_array( $table ) ) {
1132                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
1133                 }
1134
1135                 return $this->fieldInfoMulti( $table, $field );
1136         }
1137
1138         protected function doBegin( $fname = __METHOD__ ) {
1139                 $this->mTrxLevel = 1;
1140                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
1141         }
1142
1143         protected function doCommit( $fname = __METHOD__ ) {
1144                 if ( $this->mTrxLevel ) {
1145                         $ret = oci_commit( $this->mConn );
1146                         if ( !$ret ) {
1147                                 throw new DBUnexpectedError( $this, $this->lastError() );
1148                         }
1149                         $this->mTrxLevel = 0;
1150                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
1151                 }
1152         }
1153
1154         protected function doRollback( $fname = __METHOD__ ) {
1155                 if ( $this->mTrxLevel ) {
1156                         oci_rollback( $this->mConn );
1157                         $this->mTrxLevel = 0;
1158                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
1159                 }
1160         }
1161
1162         /**
1163          * defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
1164          *
1165          * @param resource $fp
1166          * @param bool|string $lineCallback
1167          * @param bool|callable $resultCallback
1168          * @param string $fname
1169          * @param bool|callable $inputCallback
1170          * @return bool|string
1171          */
1172         function sourceStream( $fp, $lineCallback = false, $resultCallback = false,
1173                 $fname = __METHOD__, $inputCallback = false ) {
1174                 $cmd = '';
1175                 $done = false;
1176                 $dollarquote = false;
1177
1178                 $replacements = [];
1179
1180                 while ( !feof( $fp ) ) {
1181                         if ( $lineCallback ) {
1182                                 call_user_func( $lineCallback );
1183                         }
1184                         $line = trim( fgets( $fp, 1024 ) );
1185                         $sl = strlen( $line ) - 1;
1186
1187                         if ( $sl < 0 ) {
1188                                 continue;
1189                         }
1190                         if ( '-' == $line[0] && '-' == $line[1] ) {
1191                                 continue;
1192                         }
1193
1194                         // Allow dollar quoting for function declarations
1195                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
1196                                 if ( $dollarquote ) {
1197                                         $dollarquote = false;
1198                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
1199                                         $done = true;
1200                                 } else {
1201                                         $dollarquote = true;
1202                                 }
1203                         } elseif ( !$dollarquote ) {
1204                                 if ( ';' == $line[$sl] && ( $sl < 2 || ';' != $line[$sl - 1] ) ) {
1205                                         $done = true;
1206                                         $line = substr( $line, 0, $sl );
1207                                 }
1208                         }
1209
1210                         if ( $cmd != '' ) {
1211                                 $cmd .= ' ';
1212                         }
1213                         $cmd .= "$line\n";
1214
1215                         if ( $done ) {
1216                                 $cmd = str_replace( ';;', ";", $cmd );
1217                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1218                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1219                                                 $replacements[$defines[2]] = $defines[1];
1220                                         }
1221                                 } else {
1222                                         foreach ( $replacements as $mwVar => $scVar ) {
1223                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1224                                         }
1225
1226                                         $cmd = $this->replaceVars( $cmd );
1227                                         if ( $inputCallback ) {
1228                                                 call_user_func( $inputCallback, $cmd );
1229                                         }
1230                                         $res = $this->doQuery( $cmd );
1231                                         if ( $resultCallback ) {
1232                                                 call_user_func( $resultCallback, $res, $this );
1233                                         }
1234
1235                                         if ( false === $res ) {
1236                                                 $err = $this->lastError();
1237
1238                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1239                                         }
1240                                 }
1241
1242                                 $cmd = '';
1243                                 $done = false;
1244                         }
1245                 }
1246
1247                 return true;
1248         }
1249
1250         function selectDB( $db ) {
1251                 $this->mDBname = $db;
1252                 if ( $db == null || $db == $this->mUser ) {
1253                         return true;
1254                 }
1255                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper( $db );
1256                 $stmt = oci_parse( $this->mConn, $sql );
1257                 MediaWiki\suppressWarnings();
1258                 $success = oci_execute( $stmt );
1259                 MediaWiki\restoreWarnings();
1260                 if ( !$success ) {
1261                         $e = oci_error( $stmt );
1262                         if ( $e['code'] != '1435' ) {
1263                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1264                         }
1265
1266                         return false;
1267                 }
1268
1269                 return true;
1270         }
1271
1272         function strencode( $s ) {
1273                 return str_replace( "'", "''", $s );
1274         }
1275
1276         function addQuotes( $s ) {
1277                 global $wgContLang;
1278                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1279                         $s = $wgContLang->checkTitleEncoding( $s );
1280                 }
1281
1282                 return "'" . $this->strencode( $s ) . "'";
1283         }
1284
1285         public function addIdentifierQuotes( $s ) {
1286                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1287                         $s = '/*Q*/' . $s;
1288                 }
1289
1290                 return $s;
1291         }
1292
1293         public function removeIdentifierQuotes( $s ) {
1294                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1295         }
1296
1297         public function isQuotedIdentifier( $s ) {
1298                 return strpos( $s, '/*Q*/' ) !== false;
1299         }
1300
1301         private function wrapFieldForWhere( $table, &$col, &$val ) {
1302                 global $wgContLang;
1303
1304                 $col_info = $this->fieldInfoMulti( $table, $col );
1305                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1306                 if ( $col_type == 'CLOB' ) {
1307                         $col = 'TO_CHAR(' . $col . ')';
1308                         $val = $wgContLang->checkTitleEncoding( $val );
1309                 } elseif ( $col_type == 'VARCHAR2' ) {
1310                         $val = $wgContLang->checkTitleEncoding( $val );
1311                 }
1312         }
1313
1314         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1315                 $conds2 = [];
1316                 foreach ( $conds as $col => $val ) {
1317                         if ( is_array( $val ) ) {
1318                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1319                         } else {
1320                                 if ( is_numeric( $col ) && $parentCol != null ) {
1321                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1322                                 } else {
1323                                         $this->wrapFieldForWhere( $table, $col, $val );
1324                                 }
1325                                 $conds2[$col] = $val;
1326                         }
1327                 }
1328
1329                 return $conds2;
1330         }
1331
1332         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1333                 $options = [], $join_conds = []
1334         ) {
1335                 if ( is_array( $conds ) ) {
1336                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1337                 }
1338
1339                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1340         }
1341
1342         /**
1343          * Returns an optional USE INDEX clause to go after the table, and a
1344          * string to go at the end of the query
1345          *
1346          * @param array $options An associative array of options to be turned into
1347          *   an SQL query, valid keys are listed in the function.
1348          * @return array
1349          */
1350         function makeSelectOptions( $options ) {
1351                 $preLimitTail = $postLimitTail = '';
1352                 $startOpts = '';
1353
1354                 $noKeyOptions = [];
1355                 foreach ( $options as $key => $option ) {
1356                         if ( is_numeric( $key ) ) {
1357                                 $noKeyOptions[$option] = true;
1358                         }
1359                 }
1360
1361                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1362
1363                 $preLimitTail .= $this->makeOrderBy( $options );
1364
1365                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1366                         $postLimitTail .= ' FOR UPDATE';
1367                 }
1368
1369                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1370                         $startOpts .= 'DISTINCT';
1371                 }
1372
1373                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1374                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1375                 } else {
1376                         $useIndex = '';
1377                 }
1378
1379                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1380                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1381                 } else {
1382                         $ignoreIndex = '';
1383                 }
1384
1385                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1386         }
1387
1388         public function delete( $table, $conds, $fname = __METHOD__ ) {
1389                 if ( is_array( $conds ) ) {
1390                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1391                 }
1392                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1393                 // all deletions on these tables have transactions so final failure rollbacks these updates
1394                 $table = $this->tableName( $table );
1395                 if ( $table == $this->tableName( 'user' ) ) {
1396                         $this->update( 'archive', [ 'ar_user' => 0 ],
1397                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1398                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1399                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1400                         $this->update( 'image', [ 'img_user' => 0 ],
1401                                 [ 'img_user' => $conds['user_id'] ], $fname );
1402                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1403                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1404                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1405                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1406                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1407                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1408                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1409                                 [ 'us_user' => $conds['user_id'] ], $fname );
1410                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1411                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1412                         $this->update( 'logging', [ 'log_user' => 0 ],
1413                                 [ 'log_user' => $conds['user_id'] ], $fname );
1414                 } elseif ( $table == $this->tableName( 'image' ) ) {
1415                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1416                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1417                 }
1418
1419                 return parent::delete( $table, $conds, $fname );
1420         }
1421
1422         /**
1423          * @param string $table
1424          * @param array $values
1425          * @param array $conds
1426          * @param string $fname
1427          * @param array $options
1428          * @return bool
1429          * @throws DBUnexpectedError
1430          */
1431         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1432                 global $wgContLang;
1433
1434                 $table = $this->tableName( $table );
1435                 $opts = $this->makeUpdateOptions( $options );
1436                 $sql = "UPDATE $opts $table SET ";
1437
1438                 $first = true;
1439                 foreach ( $values as $col => &$val ) {
1440                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1441
1442                         if ( !$first ) {
1443                                 $sqlSet = ', ' . $sqlSet;
1444                         } else {
1445                                 $first = false;
1446                         }
1447                         $sql .= $sqlSet;
1448                 }
1449
1450                 if ( $conds !== [] && $conds !== '*' ) {
1451                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1452                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1453                 }
1454
1455                 $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql );
1456                 if ( $stmt === false ) {
1457                         $e = oci_error( $this->mConn );
1458                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1459
1460                         return false;
1461                 }
1462                 foreach ( $values as $col => &$val ) {
1463                         $col_info = $this->fieldInfoMulti( $table, $col );
1464                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1465
1466                         if ( $val === null ) {
1467                                 // do nothing ... null was inserted in statement creation
1468                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1469                                 if ( is_object( $val ) ) {
1470                                         $val = $val->getData();
1471                                 }
1472
1473                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1474                                         $val = '31-12-2030 12:00:00.000000';
1475                                 }
1476
1477                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1478                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1479                                         $e = oci_error( $stmt );
1480                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1481
1482                                         return false;
1483                                 }
1484                         } else {
1485                                 /** @var OCI_Lob[] $lob */
1486                                 $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB );
1487                                 if ( $lob[$col] === false ) {
1488                                         $e = oci_error( $stmt );
1489                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1490                                 }
1491
1492                                 if ( is_object( $val ) ) {
1493                                         $val = $val->getData();
1494                                 }
1495
1496                                 if ( $col_type == 'BLOB' ) {
1497                                         $lob[$col]->writeTemporary( $val );
1498                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1499                                 } else {
1500                                         $lob[$col]->writeTemporary( $val );
1501                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1502                                 }
1503                         }
1504                 }
1505
1506                 MediaWiki\suppressWarnings();
1507
1508                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1509                         $e = oci_error( $stmt );
1510                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1511                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1512
1513                                 return false;
1514                         } else {
1515                                 $this->mAffectedRows = oci_num_rows( $stmt );
1516                         }
1517                 } else {
1518                         $this->mAffectedRows = oci_num_rows( $stmt );
1519                 }
1520
1521                 MediaWiki\restoreWarnings();
1522
1523                 if ( isset( $lob ) ) {
1524                         foreach ( $lob as $lob_v ) {
1525                                 $lob_v->free();
1526                         }
1527                 }
1528
1529                 if ( !$this->mTrxLevel ) {
1530                         oci_commit( $this->mConn );
1531                 }
1532
1533                 return oci_free_statement( $stmt );
1534         }
1535
1536         function bitNot( $field ) {
1537                 // expecting bit-fields smaller than 4bytes
1538                 return 'BITNOT(' . $field . ')';
1539         }
1540
1541         function bitAnd( $fieldLeft, $fieldRight ) {
1542                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1543         }
1544
1545         function bitOr( $fieldLeft, $fieldRight ) {
1546                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1547         }
1548
1549         function getDBname() {
1550                 return $this->mDBname;
1551         }
1552
1553         function getServer() {
1554                 return $this->mServer;
1555         }
1556
1557         public function buildGroupConcatField(
1558                 $delim, $table, $field, $conds = '', $join_conds = []
1559         ) {
1560                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1561
1562                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1563         }
1564
1565         /**
1566          * @param string $field Field or column to cast
1567          * @return string
1568          * @since 1.28
1569          */
1570         public function buildStringCast( $field ) {
1571                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1572         }
1573
1574         public function getSearchEngine() {
1575                 return 'SearchOracle';
1576         }
1577
1578         public function getInfinity() {
1579                 return '31-12-2030 12:00:00.000000';
1580         }
1581 }