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 = array();
  36
  37         private function array_unique_md( $array_in ) {
  38                 $array_out = array();
  39                 $array_hashes = array();
  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 $db DatabaseBase
  54          * @param $stmt
  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 = array();
 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 DatabaseBase {
 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 = array();
 209
 210         function __construct( $p = null ) {
 211                 global $wgDBprefix;
 212
 213                 if ( !is_array( $p ) ) { // legacy calling pattern
 214                         wfDeprecated( __METHOD__ . " method called without parameter array.", "1.22" );
 215                         $args = func_get_args();
 216                         $p = array(
 217                                 'host' => isset( $args[0] ) ? $args[0] : false,
 218                                 'user' => isset( $args[1] ) ? $args[1] : false,
 219                                 'password' => isset( $args[2] ) ? $args[2] : false,
 220                                 'dbname' => isset( $args[3] ) ? $args[3] : false,
 221                                 'flags' => isset( $args[4] ) ? $args[4] : 0,
 222                                 'tablePrefix' => isset( $args[5] ) ? $args[5] : 'get from global',
 223                                 'foreign' => isset( $args[6] ) ? $args[6] : false
 224                         );
 225                 }
 226                 if ( $p['tablePrefix'] == 'get from global' ) {
 227                         $p['tablePrefix'] = $wgDBprefix;
 228                 }
 229                 $p['tablePrefix'] = strtoupper( $p['tablePrefix'] );
 230                 parent::__construct( $p );
 231                 wfRunHooks( 'DatabaseOraclePostInit', array( $this ) );
 232         }
 233
 234         function __destruct() {
 235                 if ( $this->mOpened ) {
 236                         wfSuppressWarnings();
 237                         $this->close();
 238                         wfRestoreWarnings();
 239                 }
 240         }
 241
 242         function getType() {
 243                 return 'oracle';
 244         }
 245
 246         function cascadingDeletes() {
 247                 return true;
 248         }
 249
 250         function cleanupTriggers() {
 251                 return true;
 252         }
 253
 254         function strictIPs() {
 255                 return true;
 256         }
 257
 258         function realTimestamps() {
 259                 return true;
 260         }
 261
 262         function implicitGroupby() {
 263                 return false;
 264         }
 265
 266         function implicitOrderby() {
 267                 return false;
 268         }
 269
 270         function searchableIPs() {
 271                 return true;
 272         }
 273
 274         /**
 275          * Usually aborts on failure
 276          * @param string $server
 277          * @param string $user
 278          * @param string $password
 279          * @param string $dbName
 280          * @throws DBConnectionError
 281          * @return DatabaseBase|null
 282          */
 283         function open( $server, $user, $password, $dbName ) {
 284                 global $wgDBOracleDRCP;
 285                 if ( !function_exists( 'oci_connect' ) ) {
 286                         throw new DBConnectionError(
 287                                 $this,
 288                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
 289                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
 290                                         "and database)\n" );
 291                 }
 292
 293                 $this->close();
 294                 $this->mUser = $user;
 295                 $this->mPassword = $password;
 296                 // changed internal variables functions
 297                 // mServer now holds the TNS endpoint
 298                 // mDBname is schema name if different from username
 299                 if ( !$server ) {
 300                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 301                         $this->mServer = $dbName;
 302                         $this->mDBname = $user;
 303                 } else {
 304                         $this->mServer = $server;
 305                         if ( !$dbName ) {
 306                                 $this->mDBname = $user;
 307                         } else {
 308                                 $this->mDBname = $dbName;
 309                         }
 310                 }
 311
 312                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 313                         return null;
 314                 }
 315
 316                 if ( $wgDBOracleDRCP ) {
 317                         $this->setFlag( DBO_PERSISTENT );
 318                 }
 319
 320                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 321
 322                 wfSuppressWarnings();
 323                 if ( $this->mFlags & DBO_PERSISTENT ) {
 324                         $this->mConn = oci_pconnect(
 325                                 $this->mUser,
 326                                 $this->mPassword,
 327                                 $this->mServer,
 328                                 $this->defaultCharset,
 329                                 $session_mode
 330                         );
 331                 } elseif ( $this->mFlags & DBO_DEFAULT ) {
 332                         $this->mConn = oci_new_connect(
 333                                 $this->mUser,
 334                                 $this->mPassword,
 335                                 $this->mServer,
 336                                 $this->defaultCharset,
 337                                 $session_mode
 338                         );
 339                 } else {
 340                         $this->mConn = oci_connect(
 341                                 $this->mUser,
 342                                 $this->mPassword,
 343                                 $this->mServer,
 344                                 $this->defaultCharset,
 345                                 $session_mode
 346                         );
 347                 }
 348                 wfRestoreWarnings();
 349
 350                 if ( $this->mUser != $this->mDBname ) {
 351                         //change current schema in session
 352                         $this->selectDB( $this->mDBname );
 353                 }
 354
 355                 if ( !$this->mConn ) {
 356                         throw new DBConnectionError( $this, $this->lastError() );
 357                 }
 358
 359                 $this->mOpened = true;
 360
 361                 # removed putenv calls because they interfere with the system globaly
 362                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 363                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 364                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 365
 366                 return $this->mConn;
 367         }
 368
 369         /**
 370          * Closes a database connection, if it is open
 371          * Returns success, true if already closed
 372          * @return bool
 373          */
 374         protected function closeConnection() {
 375                 return oci_close( $this->mConn );
 376         }
 377
 378         function execFlags() {
 379                 return $this->mTrxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 380         }
 381
 382         protected function doQuery( $sql ) {
 383                 wfDebug( "SQL: [$sql]\n" );
 384                 if ( !StringUtils::isUtf8( $sql ) ) {
 385                         throw new MWException( "SQL encoding is invalid\n$sql" );
 386                 }
 387
 388                 // handle some oracle specifics
 389                 // remove AS column/table/subquery namings
 390                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 391                         $sql = preg_replace( '/ as /i', ' ', $sql );
 392                 }
 393
 394                 // Oracle has issues with UNION clause if the statement includes LOB fields
 395                 // So we do a UNION ALL and then filter the results array with array_unique
 396                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 397                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 398                 // you have to select data from plan table after explain
 399                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 400
 401                 $sql = preg_replace(
 402                         '/^EXPLAIN /',
 403                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 404                         $sql,
 405                         1,
 406                         $explain_count
 407                 );
 408
 409                 wfSuppressWarnings();
 410
 411                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 412                         $e = oci_error( $this->mConn );
 413                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 414
 415                         return false;
 416                 }
 417
 418                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 419                         $e = oci_error( $stmt );
 420                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 421                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 422
 423                                 return false;
 424                         }
 425                 }
 426
 427                 wfRestoreWarnings();
 428
 429                 if ( $explain_count > 0 ) {
 430                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 431                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 432                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 433                         return new ORAResult( $this, $stmt, $union_unique );
 434                 } else {
 435                         $this->mAffectedRows = oci_num_rows( $stmt );
 436
 437                         return true;
 438                 }
 439         }
 440
 441         function queryIgnore( $sql, $fname = '' ) {
 442                 return $this->query( $sql, $fname, true );
 443         }
 444
 445         function freeResult( $res ) {
 446                 if ( $res instanceof ResultWrapper ) {
 447                         $res = $res->result;
 448                 }
 449
 450                 $res->free();
 451         }
 452
 453         function fetchObject( $res ) {
 454                 if ( $res instanceof ResultWrapper ) {
 455                         $res = $res->result;
 456                 }
 457
 458                 return $res->fetchObject();
 459         }
 460
 461         function fetchRow( $res ) {
 462                 if ( $res instanceof ResultWrapper ) {
 463                         $res = $res->result;
 464                 }
 465
 466                 return $res->fetchRow();
 467         }
 468
 469         function numRows( $res ) {
 470                 if ( $res instanceof ResultWrapper ) {
 471                         $res = $res->result;
 472                 }
 473
 474                 return $res->numRows();
 475         }
 476
 477         function numFields( $res ) {
 478                 if ( $res instanceof ResultWrapper ) {
 479                         $res = $res->result;
 480                 }
 481
 482                 return $res->numFields();
 483         }
 484
 485         function fieldName( $stmt, $n ) {
 486                 return oci_field_name( $stmt, $n );
 487         }
 488
 489         /**
 490          * This must be called after nextSequenceVal
 491          * @return null|int
 492          */
 493         function insertId() {
 494                 return $this->mInsertId;
 495         }
 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          * @return bool
 533          */
 534         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 535                 return false;
 536         }
 537
 538         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 539                 return false;
 540         }
 541
 542         function insert( $table, $a, $fname = __METHOD__, $options = array() ) {
 543                 if ( !count( $a ) ) {
 544                         return true;
 545                 }
 546
 547                 if ( !is_array( $options ) ) {
 548                         $options = array( $options );
 549                 }
 550
 551                 if ( in_array( 'IGNORE', $options ) ) {
 552                         $this->ignoreDupValOnIndex = true;
 553                 }
 554
 555                 if ( !is_array( reset( $a ) ) ) {
 556                         $a = array( $a );
 557                 }
 558
 559                 foreach ( $a as &$row ) {
 560                         $this->insertOneRow( $table, $row, $fname );
 561                 }
 562                 $retVal = true;
 563
 564                 if ( in_array( 'IGNORE', $options ) ) {
 565                         $this->ignoreDupValOnIndex = false;
 566                 }
 567
 568                 return $retVal;
 569         }
 570
 571         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 572                 $col_info = $this->fieldInfoMulti( $table, $col );
 573                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 574
 575                 $bind = '';
 576                 if ( is_numeric( $col ) ) {
 577                         $bind = $val;
 578                         $val = null;
 579
 580                         return $bind;
 581                 } elseif ( $includeCol ) {
 582                         $bind = "$col = ";
 583                 }
 584
 585                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 586                         $val = null;
 587                 }
 588
 589                 if ( $val === 'NULL' ) {
 590                         $val = null;
 591                 }
 592
 593                 if ( $val === null ) {
 594                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 595                                 $bind .= 'DEFAULT';
 596                         } else {
 597                                 $bind .= 'NULL';
 598                         }
 599                 } else {
 600                         $bind .= ':' . $col;
 601                 }
 602
 603                 return $bind;
 604         }
 605
 606         private function insertOneRow( $table, $row, $fname ) {
 607                 global $wgContLang;
 608
 609                 $table = $this->tableName( $table );
 610                 // "INSERT INTO tables (a, b, c)"
 611                 $sql = "INSERT INTO " . $table . " (" . join( ',', array_keys( $row ) ) . ')';
 612                 $sql .= " VALUES (";
 613
 614                 // for each value, append ":key"
 615                 $first = true;
 616                 foreach ( $row as $col => &$val ) {
 617                         if ( !$first ) {
 618                                 $sql .= ', ';
 619                         } else {
 620                                 $first = false;
 621                         }
 622
 623                         $sql .= $this->fieldBindStatement( $table, $col, $val );
 624                 }
 625                 $sql .= ')';
 626
 627                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 628                         $e = oci_error( $this->mConn );
 629                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 630
 631                         return false;
 632                 }
 633                 foreach ( $row as $col => &$val ) {
 634                         $col_info = $this->fieldInfoMulti( $table, $col );
 635                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 636
 637                         if ( $val === null ) {
 638                                 // do nothing ... null was inserted in statement creation
 639                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 640                                 if ( is_object( $val ) ) {
 641                                         $val = $val->fetch();
 642                                 }
 643
 644                                 // backward compatibility
 645                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 646                                         $val = $this->getInfinity();
 647                                 }
 648
 649                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 650                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 651                                         $e = oci_error( $stmt );
 652                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 653
 654                                         return false;
 655                                 }
 656                         } else {
 657                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
 658                                         $e = oci_error( $stmt );
 659                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 660                                 }
 661
 662                                 if ( is_object( $val ) ) {
 663                                         $val = $val->fetch();
 664                                 }
 665
 666                                 if ( $col_type == 'BLOB' ) {
 667                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 668                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 669                                 } else {
 670                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 671                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 672                                 }
 673                         }
 674                 }
 675
 676                 wfSuppressWarnings();
 677
 678                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 679                         $e = oci_error( $stmt );
 680                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 681                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 682
 683                                 return false;
 684                         } else {
 685                                 $this->mAffectedRows = oci_num_rows( $stmt );
 686                         }
 687                 } else {
 688                         $this->mAffectedRows = oci_num_rows( $stmt );
 689                 }
 690
 691                 wfRestoreWarnings();
 692
 693                 if ( isset( $lob ) ) {
 694                         foreach ( $lob as $lob_v ) {
 695                                 $lob_v->free();
 696                         }
 697                 }
 698
 699                 if ( !$this->mTrxLevel ) {
 700                         oci_commit( $this->mConn );
 701                 }
 702
 703                 oci_free_statement( $stmt );
 704         }
 705
 706         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 707                 $insertOptions = array(), $selectOptions = array()
 708         ) {
 709                 $destTable = $this->tableName( $destTable );
 710                 if ( !is_array( $selectOptions ) ) {
 711                         $selectOptions = array( $selectOptions );
 712                 }
 713                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 714                 if ( is_array( $srcTable ) ) {
 715                         $srcTable = implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 716                 } else {
 717                         $srcTable = $this->tableName( $srcTable );
 718                 }
 719
 720                 if ( ( $sequenceData = $this->getSequenceData( $destTable ) ) !== false &&
 721                         !isset( $varMap[$sequenceData['column']] )
 722                 ) {
 723                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 724                 }
 725
 726                 // count-alias subselect fields to avoid abigious definition errors
 727                 $i = 0;
 728                 foreach ( $varMap as &$val ) {
 729                         $val = $val . ' field' . ( $i++ );
 730                 }
 731
 732                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 733                         " SELECT $startOpts " . implode( ',', $varMap ) .
 734                         " FROM $srcTable $useIndex ";
 735                 if ( $conds != '*' ) {
 736                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 737                 }
 738                 $sql .= " $tailOpts";
 739
 740                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 741                         $this->ignoreDupValOnIndex = true;
 742                 }
 743
 744                 $retval = $this->query( $sql, $fname );
 745
 746                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 747                         $this->ignoreDupValOnIndex = false;
 748                 }
 749
 750                 return $retval;
 751         }
 752
 753         function tableName( $name, $format = 'quoted' ) {
 754                 /*
 755                 Replace reserved words with better ones
 756                 Using uppercase because that's the only way Oracle can handle
 757                 quoted tablenames
 758                 */
 759                 switch ( $name ) {
 760                         case 'user':
 761                                 $name = 'MWUSER';
 762                                 break;
 763                         case 'text':
 764                                 $name = 'PAGECONTENT';
 765                                 break;
 766                 }
 767
 768                 return strtoupper( parent::tableName( $name, $format ) );
 769         }
 770
 771         function tableNameInternal( $name ) {
 772                 $name = $this->tableName( $name );
 773
 774                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 775         }
 776
 777         /**
 778          * Return the next in a sequence, save the value for retrieval via insertId()
 779          *
 780          * @param string $seqName
 781          * @return null|int
 782          */
 783         function nextSequenceValue( $seqName ) {
 784                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 785                 $row = $this->fetchRow( $res );
 786                 $this->mInsertId = $row[0];
 787
 788                 return $this->mInsertId;
 789         }
 790
 791         /**
 792          * Return sequence_name if table has a sequence
 793          *
 794          * @param string $table
 795          * @return bool
 796          */
 797         private function getSequenceData( $table ) {
 798                 if ( $this->sequenceData == null ) {
 799                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 800                                 lower(atc.table_name),
 801                                 lower(atc.column_name)
 802                         FROM all_sequences asq, all_tab_columns atc
 803                         WHERE decode(
 804                                         atc.table_name,
 805                                         '{$this->mTablePrefix}MWUSER',
 806                                         '{$this->mTablePrefix}USER',
 807                                         atc.table_name
 808                                 ) || '_' ||
 809                                 atc.column_name || '_SEQ' = '{$this->mTablePrefix}' || asq.sequence_name
 810                                 AND asq.sequence_owner = upper('{$this->mDBname}')
 811                                 AND atc.owner = upper('{$this->mDBname}')" );
 812
 813                         while ( ( $row = $result->fetchRow() ) !== false ) {
 814                                 $this->sequenceData[$row[1]] = array(
 815                                         'sequence' => $row[0],
 816                                         'column' => $row[2]
 817                                 );
 818                         }
 819                 }
 820                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 821
 822                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 823         }
 824
 825         # Returns the size of a text field, or -1 for "unlimited"
 826         function textFieldSize( $table, $field ) {
 827                 $fieldInfoData = $this->fieldInfo( $table, $field );
 828
 829                 return $fieldInfoData->maxLength();
 830         }
 831
 832         function limitResult( $sql, $limit, $offset = false ) {
 833                 if ( $offset === false ) {
 834                         $offset = 0;
 835                 }
 836
 837                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 838         }
 839
 840         function encodeBlob( $b ) {
 841                 return new Blob( $b );
 842         }
 843
 844         function decodeBlob( $b ) {
 845                 if ( $b instanceof Blob ) {
 846                         $b = $b->fetch();
 847                 }
 848
 849                 return $b;
 850         }
 851
 852         function unionQueries( $sqls, $all ) {
 853                 $glue = ' UNION ALL ';
 854
 855                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 856                         'FROM (' . implode( $glue, $sqls ) . ')';
 857         }
 858
 859         function wasDeadlock() {
 860                 return $this->lastErrno() == 'OCI-00060';
 861         }
 862
 863         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 864                 $fname = __METHOD__
 865         ) {
 866                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 867
 868                 $newName = strtoupper( $newName );
 869                 $oldName = strtoupper( $oldName );
 870
 871                 $tabName = substr( $newName, strlen( $this->mTablePrefix ) );
 872                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 873                 $newPrefix = strtoupper( $this->mTablePrefix );
 874
 875                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 876                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 877         }
 878
 879         function listTables( $prefix = null, $fname = __METHOD__ ) {
 880                 $listWhere = '';
 881                 if ( !empty( $prefix ) ) {
 882                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 883                 }
 884
 885                 $owner = strtoupper( $this->mDBname );
 886                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 887                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 888
 889                 // dirty code ... i know
 890                 $endArray = array();
 891                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 892                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 893                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 894                 $fixedOrderTabs = $endArray;
 895                 while ( ( $row = $result->fetchRow() ) !== false ) {
 896                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 897                                 $endArray[] = $row['table_name'];
 898                         }
 899                 }
 900
 901                 return $endArray;
 902         }
 903
 904         public function dropTable( $tableName, $fName = __METHOD__ ) {
 905                 $tableName = $this->tableName( $tableName );
 906                 if ( !$this->tableExists( $tableName ) ) {
 907                         return false;
 908                 }
 909
 910                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 911         }
 912
 913         function timestamp( $ts = 0 ) {
 914                 return wfTimestamp( TS_ORACLE, $ts );
 915         }
 916
 917         /**
 918          * Return aggregated value function call
 919          */
 920         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 921                 return $valuedata;
 922         }
 923
 924         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 925                 # Ignore errors during error handling to avoid infinite
 926                 # recursion
 927                 $ignore = $this->ignoreErrors( true );
 928                 ++$this->mErrorCount;
 929
 930                 if ( $ignore || $tempIgnore ) {
 931                         wfDebug( "SQL ERROR (ignored): $error\n" );
 932                         $this->ignoreErrors( $ignore );
 933                 } else {
 934                         throw new DBQueryError( $this, $error, $errno, $sql, $fname );
 935                 }
 936         }
 937
 938         /**
 939          * @return string wikitext of a link to the server software's web site
 940          */
 941         public function getSoftwareLink() {
 942                 return '[http://www.oracle.com/ Oracle]';
 943         }
 944
 945         /**
 946          * @return string Version information from the database
 947          */
 948         function getServerVersion() {
 949                 //better version number, fallback on driver
 950                 $rset = $this->doQuery(
 951                         'SELECT version FROM product_component_version ' .
 952                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 953                 );
 954                 if ( !( $row = $rset->fetchRow() ) ) {
 955                         return oci_server_version( $this->mConn );
 956                 }
 957
 958                 return $row['version'];
 959         }
 960
 961         /**
 962          * Query whether a given index exists
 963          * @return bool
 964          */
 965         function indexExists( $table, $index, $fname = __METHOD__ ) {
 966                 $table = $this->tableName( $table );
 967                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 968                 $index = strtoupper( $index );
 969                 $owner = strtoupper( $this->mDBname );
 970                 $SQL = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 971                 $res = $this->doQuery( $SQL );
 972                 if ( $res ) {
 973                         $count = $res->numRows();
 974                         $res->free();
 975                 } else {
 976                         $count = 0;
 977                 }
 978
 979                 return $count != 0;
 980         }
 981
 982         /**
 983          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 984          * @return bool
 985          */
 986         function tableExists( $table, $fname = __METHOD__ ) {
 987                 $table = $this->tableName( $table );
 988                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 989                 $owner = $this->addQuotes( strtoupper( $this->mDBname ) );
 990                 $SQL = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 991                 $res = $this->doQuery( $SQL );
 992                 if ( $res && $res->numRows() > 0 ) {
 993                         $exists = true;
 994                 } else {
 995                         $exists = false;
 996                 }
 997
 998                 $res->free();
 999
1000                 return $exists;
1001         }
1002
1003         /**
1004          * Function translates mysql_fetch_field() functionality on ORACLE.
1005          * Caching is present for reducing query time.
1006          * For internal calls. Use fieldInfo for normal usage.
1007          * Returns false if the field doesn't exist
1008          *
1009          * @param $table Array
1010          * @param $field String
1011          * @return ORAField|ORAResult
1012          */
1013         private function fieldInfoMulti( $table, $field ) {
1014                 $field = strtoupper( $field );
1015                 if ( is_array( $table ) ) {
1016                         $table = array_map( array( &$this, 'tableNameInternal' ), $table );
1017                         $tableWhere = 'IN (';
1018                         foreach ( $table as &$singleTable ) {
1019                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
1020                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
1021                                         return $this->mFieldInfoCache["$singleTable.$field"];
1022                                 }
1023                                 $tableWhere .= '\'' . $singleTable . '\',';
1024                         }
1025                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
1026                 } else {
1027                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
1028                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
1029                                 return $this->mFieldInfoCache["$table.$field"];
1030                         }
1031                         $tableWhere = '= \'' . $table . '\'';
1032                 }
1033
1034                 $fieldInfoStmt = oci_parse(
1035                         $this->mConn,
1036                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
1037                                 $tableWhere . ' and column_name = \'' . $field . '\''
1038                 );
1039                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
1040                         $e = oci_error( $fieldInfoStmt );
1041                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
1042
1043                         return false;
1044                 }
1045                 $res = new ORAResult( $this, $fieldInfoStmt );
1046                 if ( $res->numRows() == 0 ) {
1047                         if ( is_array( $table ) ) {
1048                                 foreach ( $table as &$singleTable ) {
1049                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
1050                                 }
1051                         } else {
1052                                 $this->mFieldInfoCache["$table.$field"] = false;
1053                         }
1054                         $fieldInfoTemp = null;
1055                 } else {
1056                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
1057                         $table = $fieldInfoTemp->tableName();
1058                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
1059                 }
1060                 $res->free();
1061
1062                 return $fieldInfoTemp;
1063         }
1064
1065         /**
1066          * @throws DBUnexpectedError
1067          * @param  $table
1068          * @param  $field
1069          * @return ORAField
1070          */
1071         function fieldInfo( $table, $field ) {
1072                 if ( is_array( $table ) ) {
1073                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
1074                 }
1075
1076                 return $this->fieldInfoMulti( $table, $field );
1077         }
1078
1079         protected function doBegin( $fname = __METHOD__ ) {
1080                 $this->mTrxLevel = 1;
1081                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
1082         }
1083
1084         protected function doCommit( $fname = __METHOD__ ) {
1085                 if ( $this->mTrxLevel ) {
1086                         $ret = oci_commit( $this->mConn );
1087                         if ( !$ret ) {
1088                                 throw new DBUnexpectedError( $this, $this->lastError() );
1089                         }
1090                         $this->mTrxLevel = 0;
1091                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
1092                 }
1093         }
1094
1095         protected function doRollback( $fname = __METHOD__ ) {
1096                 if ( $this->mTrxLevel ) {
1097                         oci_rollback( $this->mConn );
1098                         $this->mTrxLevel = 0;
1099                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
1100                 }
1101         }
1102
1103         /* defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}'; */
1104         function sourceStream( $fp, $lineCallback = false, $resultCallback = false,
1105                 $fname = __METHOD__, $inputCallback = false ) {
1106                 $cmd = '';
1107                 $done = false;
1108                 $dollarquote = false;
1109
1110                 $replacements = array();
1111
1112                 while ( !feof( $fp ) ) {
1113                         if ( $lineCallback ) {
1114                                 call_user_func( $lineCallback );
1115                         }
1116                         $line = trim( fgets( $fp, 1024 ) );
1117                         $sl = strlen( $line ) - 1;
1118
1119                         if ( $sl < 0 ) {
1120                                 continue;
1121                         }
1122                         if ( '-' == $line[0] && '-' == $line[1] ) {
1123                                 continue;
1124                         }
1125
1126                         // Allow dollar quoting for function declarations
1127                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
1128                                 if ( $dollarquote ) {
1129                                         $dollarquote = false;
1130                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
1131                                         $done = true;
1132                                 } else {
1133                                         $dollarquote = true;
1134                                 }
1135                         } elseif ( !$dollarquote ) {
1136                                 if ( ';' == $line[$sl] && ( $sl < 2 || ';' != $line[$sl - 1] ) ) {
1137                                         $done = true;
1138                                         $line = substr( $line, 0, $sl );
1139                                 }
1140                         }
1141
1142                         if ( $cmd != '' ) {
1143                                 $cmd .= ' ';
1144                         }
1145                         $cmd .= "$line\n";
1146
1147                         if ( $done ) {
1148                                 $cmd = str_replace( ';;', ";", $cmd );
1149                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1150                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1151                                                 $replacements[$defines[2]] = $defines[1];
1152                                         }
1153                                 } else {
1154                                         foreach ( $replacements as $mwVar => $scVar ) {
1155                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1156                                         }
1157
1158                                         $cmd = $this->replaceVars( $cmd );
1159                                         if ( $inputCallback ) {
1160                                                 call_user_func( $inputCallback, $cmd );
1161                                         }
1162                                         $res = $this->doQuery( $cmd );
1163                                         if ( $resultCallback ) {
1164                                                 call_user_func( $resultCallback, $res, $this );
1165                                         }
1166
1167                                         if ( false === $res ) {
1168                                                 $err = $this->lastError();
1169
1170                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1171                                         }
1172                                 }
1173
1174                                 $cmd = '';
1175                                 $done = false;
1176                         }
1177                 }
1178
1179                 return true;
1180         }
1181
1182         function selectDB( $db ) {
1183                 $this->mDBname = $db;
1184                 if ( $db == null || $db == $this->mUser ) {
1185                         return true;
1186                 }
1187                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper( $db );
1188                 $stmt = oci_parse( $this->mConn, $sql );
1189                 wfSuppressWarnings();
1190                 $success = oci_execute( $stmt );
1191                 wfRestoreWarnings();
1192                 if ( !$success ) {
1193                         $e = oci_error( $stmt );
1194                         if ( $e['code'] != '1435' ) {
1195                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1196                         }
1197
1198                         return false;
1199                 }
1200
1201                 return true;
1202         }
1203
1204         function strencode( $s ) {
1205                 return str_replace( "'", "''", $s );
1206         }
1207
1208         function addQuotes( $s ) {
1209                 global $wgContLang;
1210                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1211                         $s = $wgContLang->checkTitleEncoding( $s );
1212                 }
1213
1214                 return "'" . $this->strencode( $s ) . "'";
1215         }
1216
1217         public function addIdentifierQuotes( $s ) {
1218                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1219                         $s = '/*Q*/' . $s;
1220                 }
1221
1222                 return $s;
1223         }
1224
1225         public function removeIdentifierQuotes( $s ) {
1226                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1227         }
1228
1229         public function isQuotedIdentifier( $s ) {
1230                 return strpos( $s, '/*Q*/' ) !== false;
1231         }
1232
1233         private function wrapFieldForWhere( $table, &$col, &$val ) {
1234                 global $wgContLang;
1235
1236                 $col_info = $this->fieldInfoMulti( $table, $col );
1237                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1238                 if ( $col_type == 'CLOB' ) {
1239                         $col = 'TO_CHAR(' . $col . ')';
1240                         $val = $wgContLang->checkTitleEncoding( $val );
1241                 } elseif ( $col_type == 'VARCHAR2' ) {
1242                         $val = $wgContLang->checkTitleEncoding( $val );
1243                 }
1244         }
1245
1246         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1247                 $conds2 = array();
1248                 foreach ( $conds as $col => $val ) {
1249                         if ( is_array( $val ) ) {
1250                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1251                         } else {
1252                                 if ( is_numeric( $col ) && $parentCol != null ) {
1253                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1254                                 } else {
1255                                         $this->wrapFieldForWhere( $table, $col, $val );
1256                                 }
1257                                 $conds2[$col] = $val;
1258                         }
1259                 }
1260
1261                 return $conds2;
1262         }
1263
1264         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1265                 $options = array(), $join_conds = array()
1266         ) {
1267                 if ( is_array( $conds ) ) {
1268                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1269                 }
1270
1271                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1272         }
1273
1274         /**
1275          * Returns an optional USE INDEX clause to go after the table, and a
1276          * string to go at the end of the query
1277          *
1278          * @private
1279          *
1280          * @param array $options an associative array of options to be turned into
1281          *              an SQL query, valid keys are listed in the function.
1282          * @return array
1283          */
1284         function makeSelectOptions( $options ) {
1285                 $preLimitTail = $postLimitTail = '';
1286                 $startOpts = '';
1287
1288                 $noKeyOptions = array();
1289                 foreach ( $options as $key => $option ) {
1290                         if ( is_numeric( $key ) ) {
1291                                 $noKeyOptions[$option] = true;
1292                         }
1293                 }
1294
1295                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1296
1297                 $preLimitTail .= $this->makeOrderBy( $options );
1298
1299                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1300                         $postLimitTail .= ' FOR UPDATE';
1301                 }
1302
1303                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1304                         $startOpts .= 'DISTINCT';
1305                 }
1306
1307                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1308                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1309                 } else {
1310                         $useIndex = '';
1311                 }
1312
1313                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1314         }
1315
1316         public function delete( $table, $conds, $fname = __METHOD__ ) {
1317                 if ( is_array( $conds ) ) {
1318                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1319                 }
1320                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1321                 // all deletions on these tables have transactions so final failure rollbacks these updates
1322                 $table = $this->tableName( $table );
1323                 if ( $table == $this->tableName( 'user' ) ) {
1324                         $this->update( 'archive', array( 'ar_user' => 0 ),
1325                                 array( 'ar_user' => $conds['user_id'] ), $fname );
1326                         $this->update( 'ipblocks', array( 'ipb_user' => 0 ),
1327                                 array( 'ipb_user' => $conds['user_id'] ), $fname );
1328                         $this->update( 'image', array( 'img_user' => 0 ),
1329                                 array( 'img_user' => $conds['user_id'] ), $fname );
1330                         $this->update( 'oldimage', array( 'oi_user' => 0 ),
1331                                 array( 'oi_user' => $conds['user_id'] ), $fname );
1332                         $this->update( 'filearchive', array( 'fa_deleted_user' => 0 ),
1333                                 array( 'fa_deleted_user' => $conds['user_id'] ), $fname );
1334                         $this->update( 'filearchive', array( 'fa_user' => 0 ),
1335                                 array( 'fa_user' => $conds['user_id'] ), $fname );
1336                         $this->update( 'uploadstash', array( 'us_user' => 0 ),
1337                                 array( 'us_user' => $conds['user_id'] ), $fname );
1338                         $this->update( 'recentchanges', array( 'rc_user' => 0 ),
1339                                 array( 'rc_user' => $conds['user_id'] ), $fname );
1340                         $this->update( 'logging', array( 'log_user' => 0 ),
1341                                 array( 'log_user' => $conds['user_id'] ), $fname );
1342                 } elseif ( $table == $this->tableName( 'image' ) ) {
1343                         $this->update( 'oldimage', array( 'oi_name' => 0 ),
1344                                 array( 'oi_name' => $conds['img_name'] ), $fname );
1345                 }
1346
1347                 return parent::delete( $table, $conds, $fname );
1348         }
1349
1350         function update( $table, $values, $conds, $fname = __METHOD__, $options = array() ) {
1351                 global $wgContLang;
1352
1353                 $table = $this->tableName( $table );
1354                 $opts = $this->makeUpdateOptions( $options );
1355                 $sql = "UPDATE $opts $table SET ";
1356
1357                 $first = true;
1358                 foreach ( $values as $col => &$val ) {
1359                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1360
1361                         if ( !$first ) {
1362                                 $sqlSet = ', ' . $sqlSet;
1363                         } else {
1364                                 $first = false;
1365                         }
1366                         $sql .= $sqlSet;
1367                 }
1368
1369                 if ( $conds !== array() && $conds !== '*' ) {
1370                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1371                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1372                 }
1373
1374                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
1375                         $e = oci_error( $this->mConn );
1376                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1377
1378                         return false;
1379                 }
1380                 foreach ( $values as $col => &$val ) {
1381                         $col_info = $this->fieldInfoMulti( $table, $col );
1382                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1383
1384                         if ( $val === null ) {
1385                                 // do nothing ... null was inserted in statement creation
1386                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1387                                 if ( is_object( $val ) ) {
1388                                         $val = $val->getData();
1389                                 }
1390
1391                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1392                                         $val = '31-12-2030 12:00:00.000000';
1393                                 }
1394
1395                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1396                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1397                                         $e = oci_error( $stmt );
1398                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1399
1400                                         return false;
1401                                 }
1402                         } else {
1403                                 /** @var OCI_Lob[] $lob */
1404                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
1405                                         $e = oci_error( $stmt );
1406                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1407                                 }
1408
1409                                 if ( $col_type == 'BLOB' ) {
1410                                         $lob[$col]->writeTemporary( $val );
1411                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1412                                 } else {
1413                                         $lob[$col]->writeTemporary( $val );
1414                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1415                                 }
1416                         }
1417                 }
1418
1419                 wfSuppressWarnings();
1420
1421                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1422                         $e = oci_error( $stmt );
1423                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1424                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1425
1426                                 return false;
1427                         } else {
1428                                 $this->mAffectedRows = oci_num_rows( $stmt );
1429                         }
1430                 } else {
1431                         $this->mAffectedRows = oci_num_rows( $stmt );
1432                 }
1433
1434                 wfRestoreWarnings();
1435
1436                 if ( isset( $lob ) ) {
1437                         foreach ( $lob as $lob_v ) {
1438                                 $lob_v->free();
1439                         }
1440                 }
1441
1442                 if ( !$this->mTrxLevel ) {
1443                         oci_commit( $this->mConn );
1444                 }
1445
1446                 oci_free_statement( $stmt );
1447         }
1448
1449         function bitNot( $field ) {
1450                 // expecting bit-fields smaller than 4bytes
1451                 return 'BITNOT(' . $field . ')';
1452         }
1453
1454         function bitAnd( $fieldLeft, $fieldRight ) {
1455                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1456         }
1457
1458         function bitOr( $fieldLeft, $fieldRight ) {
1459                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1460         }
1461
1462         function setFakeMaster( $enabled = true ) {
1463         }
1464
1465         function getDBname() {
1466                 return $this->mDBname;
1467         }
1468
1469         function getServer() {
1470                 return $this->mServer;
1471         }
1472
1473         public function buildGroupConcatField(
1474                 $delim, $table, $field, $conds = '', $join_conds = array()
1475         ) {
1476                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1477
1478                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, array(), $join_conds ) . ')';
1479         }
1480
1481         public function getSearchEngine() {
1482                 return 'SearchOracle';
1483         }
1484
1485         public function getInfinity() {
1486                 return '31-12-2030 12:00:00.000000';
1487         }
1488 } // end DatabaseOracle class