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 $mInsertId = null;
 190         var $mLastResult = null;
 191         var $lastResult = null;
 192         var $cursor = 0;
 193         var $mAffectedRows;
 194
 195         var $ignore_DUP_VAL_ON_INDEX = false;
 196         var $sequenceData = null;
 197
 198         var $defaultCharset = 'AL32UTF8';
 199
 200         var $mFieldInfoCache = array();
 201
 202         function __construct( $p = null ) {
 203                 global $wgDBprefix;
 204
 205                 if ( !is_array( $p ) ) { // legacy calling pattern
 206                         wfDeprecated( __METHOD__ . " method called without parameter array.", "1.22" );
 207                         $args = func_get_args();
 208                         $p = array(
 209                                 'host' => isset( $args[0] ) ? $args[0] : false,
 210                                 'user' => isset( $args[1] ) ? $args[1] : false,
 211                                 'password' => isset( $args[2] ) ? $args[2] : false,
 212                                 'dbname' => isset( $args[3] ) ? $args[3] : false,
 213                                 'flags' => isset( $args[4] ) ? $args[4] : 0,
 214                                 'tablePrefix' => isset( $args[5] ) ? $args[5] : 'get from global',
 215                                 'foreign' => isset( $args[6] ) ? $args[6] : false
 216                         );
 217                 }
 218                 if ( $p['tablePrefix'] == 'get from global' ) {
 219                         $p['tablePrefix'] = $wgDBprefix;
 220                 }
 221                 $p['tablePrefix'] = strtoupper( $p['tablePrefix'] );
 222                 parent::__construct( $p );
 223                 wfRunHooks( 'DatabaseOraclePostInit', array( $this ) );
 224         }
 225
 226         function __destruct() {
 227                 if ( $this->mOpened ) {
 228                         wfSuppressWarnings();
 229                         $this->close();
 230                         wfRestoreWarnings();
 231                 }
 232         }
 233
 234         function getType() {
 235                 return 'oracle';
 236         }
 237
 238         function cascadingDeletes() {
 239                 return true;
 240         }
 241
 242         function cleanupTriggers() {
 243                 return true;
 244         }
 245
 246         function strictIPs() {
 247                 return true;
 248         }
 249
 250         function realTimestamps() {
 251                 return true;
 252         }
 253
 254         function implicitGroupby() {
 255                 return false;
 256         }
 257
 258         function implicitOrderby() {
 259                 return false;
 260         }
 261
 262         function searchableIPs() {
 263                 return true;
 264         }
 265
 266         /**
 267          * Usually aborts on failure
 268          * @param string $server
 269          * @param string $user
 270          * @param string $password
 271          * @param string $dbName
 272          * @throws DBConnectionError
 273          * @return DatabaseBase|null
 274          */
 275         function open( $server, $user, $password, $dbName ) {
 276                 global $wgDBOracleDRCP;
 277                 if ( !function_exists( 'oci_connect' ) ) {
 278                         throw new DBConnectionError(
 279                                 $this,
 280                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
 281                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
 282                                         "and database)\n" );
 283                 }
 284
 285                 $this->close();
 286                 $this->mUser = $user;
 287                 $this->mPassword = $password;
 288                 // changed internal variables functions
 289                 // mServer now holds the TNS endpoint
 290                 // mDBname is schema name if different from username
 291                 if ( !$server ) {
 292                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 293                         $this->mServer = $dbName;
 294                         $this->mDBname = $user;
 295                 } else {
 296                         $this->mServer = $server;
 297                         if ( !$dbName ) {
 298                                 $this->mDBname = $user;
 299                         } else {
 300                                 $this->mDBname = $dbName;
 301                         }
 302                 }
 303
 304                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 305                         return;
 306                 }
 307
 308                 if ( $wgDBOracleDRCP ) {
 309                         $this->setFlag( DBO_PERSISTENT );
 310                 }
 311
 312                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 313
 314                 wfSuppressWarnings();
 315                 if ( $this->mFlags & DBO_PERSISTENT ) {
 316                         $this->mConn = oci_pconnect(
 317                                 $this->mUser,
 318                                 $this->mPassword,
 319                                 $this->mServer,
 320                                 $this->defaultCharset,
 321                                 $session_mode
 322                         );
 323                 } elseif ( $this->mFlags & DBO_DEFAULT ) {
 324                         $this->mConn = oci_new_connect(
 325                                 $this->mUser,
 326                                 $this->mPassword,
 327                                 $this->mServer,
 328                                 $this->defaultCharset,
 329                                 $session_mode
 330                         );
 331                 } else {
 332                         $this->mConn = oci_connect(
 333                                 $this->mUser,
 334                                 $this->mPassword,
 335                                 $this->mServer,
 336                                 $this->defaultCharset,
 337                                 $session_mode
 338                         );
 339                 }
 340                 wfRestoreWarnings();
 341
 342                 if ( $this->mUser != $this->mDBname ) {
 343                         //change current schema in session
 344                         $this->selectDB( $this->mDBname );
 345                 }
 346
 347                 if ( !$this->mConn ) {
 348                         throw new DBConnectionError( $this, $this->lastError() );
 349                 }
 350
 351                 $this->mOpened = true;
 352
 353                 # removed putenv calls because they interfere with the system globaly
 354                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 355                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 356                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 357
 358                 return $this->mConn;
 359         }
 360
 361         /**
 362          * Closes a database connection, if it is open
 363          * Returns success, true if already closed
 364          * @return bool
 365          */
 366         protected function closeConnection() {
 367                 return oci_close( $this->mConn );
 368         }
 369
 370         function execFlags() {
 371                 return $this->mTrxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 372         }
 373
 374         protected function doQuery( $sql ) {
 375                 wfDebug( "SQL: [$sql]\n" );
 376                 if ( !StringUtils::isUtf8( $sql ) ) {
 377                         throw new MWException( "SQL encoding is invalid\n$sql" );
 378                 }
 379
 380                 // handle some oracle specifics
 381                 // remove AS column/table/subquery namings
 382                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 383                         $sql = preg_replace( '/ as /i', ' ', $sql );
 384                 }
 385
 386                 // Oracle has issues with UNION clause if the statement includes LOB fields
 387                 // So we do a UNION ALL and then filter the results array with array_unique
 388                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 389                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 390                 // you have to select data from plan table after explain
 391                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 392
 393                 $sql = preg_replace(
 394                         '/^EXPLAIN /',
 395                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 396                         $sql,
 397                         1,
 398                         $explain_count
 399                 );
 400
 401                 wfSuppressWarnings();
 402
 403                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 404                         $e = oci_error( $this->mConn );
 405                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 406
 407                         return false;
 408                 }
 409
 410                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 411                         $e = oci_error( $stmt );
 412                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 413                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 414
 415                                 return false;
 416                         }
 417                 }
 418
 419                 wfRestoreWarnings();
 420
 421                 if ( $explain_count > 0 ) {
 422                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 423                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 424                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 425                         return new ORAResult( $this, $stmt, $union_unique );
 426                 } else {
 427                         $this->mAffectedRows = oci_num_rows( $stmt );
 428
 429                         return true;
 430                 }
 431         }
 432
 433         function queryIgnore( $sql, $fname = '' ) {
 434                 return $this->query( $sql, $fname, true );
 435         }
 436
 437         function freeResult( $res ) {
 438                 if ( $res instanceof ResultWrapper ) {
 439                         $res = $res->result;
 440                 }
 441
 442                 $res->free();
 443         }
 444
 445         function fetchObject( $res ) {
 446                 if ( $res instanceof ResultWrapper ) {
 447                         $res = $res->result;
 448                 }
 449
 450                 return $res->fetchObject();
 451         }
 452
 453         function fetchRow( $res ) {
 454                 if ( $res instanceof ResultWrapper ) {
 455                         $res = $res->result;
 456                 }
 457
 458                 return $res->fetchRow();
 459         }
 460
 461         function numRows( $res ) {
 462                 if ( $res instanceof ResultWrapper ) {
 463                         $res = $res->result;
 464                 }
 465
 466                 return $res->numRows();
 467         }
 468
 469         function numFields( $res ) {
 470                 if ( $res instanceof ResultWrapper ) {
 471                         $res = $res->result;
 472                 }
 473
 474                 return $res->numFields();
 475         }
 476
 477         function fieldName( $stmt, $n ) {
 478                 return oci_field_name( $stmt, $n );
 479         }
 480
 481         /**
 482          * This must be called after nextSequenceVal
 483          * @return null
 484          */
 485         function insertId() {
 486                 return $this->mInsertId;
 487         }
 488
 489         function dataSeek( $res, $row ) {
 490                 if ( $res instanceof ORAResult ) {
 491                         $res->seek( $row );
 492                 } else {
 493                         $res->result->seek( $row );
 494                 }
 495         }
 496
 497         function lastError() {
 498                 if ( $this->mConn === false ) {
 499                         $e = oci_error();
 500                 } else {
 501                         $e = oci_error( $this->mConn );
 502                 }
 503
 504                 return $e['message'];
 505         }
 506
 507         function lastErrno() {
 508                 if ( $this->mConn === false ) {
 509                         $e = oci_error();
 510                 } else {
 511                         $e = oci_error( $this->mConn );
 512                 }
 513
 514                 return $e['code'];
 515         }
 516
 517         function affectedRows() {
 518                 return $this->mAffectedRows;
 519         }
 520
 521         /**
 522          * Returns information about an index
 523          * If errors are explicitly ignored, returns NULL on failure
 524          * @return bool
 525          */
 526         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 527                 return false;
 528         }
 529
 530         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 531                 return false;
 532         }
 533
 534         function insert( $table, $a, $fname = __METHOD__, $options = array() ) {
 535                 if ( !count( $a ) ) {
 536                         return true;
 537                 }
 538
 539                 if ( !is_array( $options ) ) {
 540                         $options = array( $options );
 541                 }
 542
 543                 if ( in_array( 'IGNORE', $options ) ) {
 544                         $this->ignore_DUP_VAL_ON_INDEX = true;
 545                 }
 546
 547                 if ( !is_array( reset( $a ) ) ) {
 548                         $a = array( $a );
 549                 }
 550
 551                 foreach ( $a as &$row ) {
 552                         $this->insertOneRow( $table, $row, $fname );
 553                 }
 554                 $retVal = true;
 555
 556                 if ( in_array( 'IGNORE', $options ) ) {
 557                         $this->ignore_DUP_VAL_ON_INDEX = false;
 558                 }
 559
 560                 return $retVal;
 561         }
 562
 563         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 564                 $col_info = $this->fieldInfoMulti( $table, $col );
 565                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 566
 567                 $bind = '';
 568                 if ( is_numeric( $col ) ) {
 569                         $bind = $val;
 570                         $val = null;
 571
 572                         return $bind;
 573                 } elseif ( $includeCol ) {
 574                         $bind = "$col = ";
 575                 }
 576
 577                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 578                         $val = null;
 579                 }
 580
 581                 if ( $val === 'NULL' ) {
 582                         $val = null;
 583                 }
 584
 585                 if ( $val === null ) {
 586                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 587                                 $bind .= 'DEFAULT';
 588                         } else {
 589                                 $bind .= 'NULL';
 590                         }
 591                 } else {
 592                         $bind .= ':' . $col;
 593                 }
 594
 595                 return $bind;
 596         }
 597
 598         private function insertOneRow( $table, $row, $fname ) {
 599                 global $wgContLang;
 600
 601                 $table = $this->tableName( $table );
 602                 // "INSERT INTO tables (a, b, c)"
 603                 $sql = "INSERT INTO " . $table . " (" . join( ',', array_keys( $row ) ) . ')';
 604                 $sql .= " VALUES (";
 605
 606                 // for each value, append ":key"
 607                 $first = true;
 608                 foreach ( $row as $col => &$val ) {
 609                         if ( !$first ) {
 610                                 $sql .= ', ';
 611                         } else {
 612                                 $first = false;
 613                         }
 614
 615                         $sql .= $this->fieldBindStatement( $table, $col, $val );
 616                 }
 617                 $sql .= ')';
 618
 619                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 620                         $e = oci_error( $this->mConn );
 621                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 622
 623                         return false;
 624                 }
 625                 foreach ( $row as $col => &$val ) {
 626                         $col_info = $this->fieldInfoMulti( $table, $col );
 627                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 628
 629                         if ( $val === null ) {
 630                                 // do nothing ... null was inserted in statement creation
 631                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 632                                 if ( is_object( $val ) ) {
 633                                         $val = $val->fetch();
 634                                 }
 635
 636                                 // backward compatibility
 637                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 638                                         $val = $this->getInfinity();
 639                                 }
 640
 641                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 642                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 643                                         $e = oci_error( $stmt );
 644                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 645
 646                                         return false;
 647                                 }
 648                         } else {
 649                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
 650                                         $e = oci_error( $stmt );
 651                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 652                                 }
 653
 654                                 if ( is_object( $val ) ) {
 655                                         $val = $val->fetch();
 656                                 }
 657
 658                                 if ( $col_type == 'BLOB' ) {
 659                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 660                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 661                                 } else {
 662                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 663                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 664                                 }
 665                         }
 666                 }
 667
 668                 wfSuppressWarnings();
 669
 670                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 671                         $e = oci_error( $stmt );
 672                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 673                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 674
 675                                 return false;
 676                         } else {
 677                                 $this->mAffectedRows = oci_num_rows( $stmt );
 678                         }
 679                 } else {
 680                         $this->mAffectedRows = oci_num_rows( $stmt );
 681                 }
 682
 683                 wfRestoreWarnings();
 684
 685                 if ( isset( $lob ) ) {
 686                         foreach ( $lob as $lob_v ) {
 687                                 $lob_v->free();
 688                         }
 689                 }
 690
 691                 if ( !$this->mTrxLevel ) {
 692                         oci_commit( $this->mConn );
 693                 }
 694
 695                 oci_free_statement( $stmt );
 696         }
 697
 698         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 699                 $insertOptions = array(), $selectOptions = array()
 700         ) {
 701                 $destTable = $this->tableName( $destTable );
 702                 if ( !is_array( $selectOptions ) ) {
 703                         $selectOptions = array( $selectOptions );
 704                 }
 705                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 706                 if ( is_array( $srcTable ) ) {
 707                         $srcTable = implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 708                 } else {
 709                         $srcTable = $this->tableName( $srcTable );
 710                 }
 711
 712                 if ( ( $sequenceData = $this->getSequenceData( $destTable ) ) !== false &&
 713                         !isset( $varMap[$sequenceData['column']] )
 714                 ) {
 715                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 716                 }
 717
 718                 // count-alias subselect fields to avoid abigious definition errors
 719                 $i = 0;
 720                 foreach ( $varMap as &$val ) {
 721                         $val = $val . ' field' . ( $i++ );
 722                 }
 723
 724                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 725                         " SELECT $startOpts " . implode( ',', $varMap ) .
 726                         " FROM $srcTable $useIndex ";
 727                 if ( $conds != '*' ) {
 728                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 729                 }
 730                 $sql .= " $tailOpts";
 731
 732                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 733                         $this->ignore_DUP_VAL_ON_INDEX = true;
 734                 }
 735
 736                 $retval = $this->query( $sql, $fname );
 737
 738                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 739                         $this->ignore_DUP_VAL_ON_INDEX = false;
 740                 }
 741
 742                 return $retval;
 743         }
 744
 745         function tableName( $name, $format = 'quoted' ) {
 746                 /*
 747                 Replace reserved words with better ones
 748                 Using uppercase because that's the only way Oracle can handle
 749                 quoted tablenames
 750                 */
 751                 switch ( $name ) {
 752                         case 'user':
 753                                 $name = 'MWUSER';
 754                                 break;
 755                         case 'text':
 756                                 $name = 'PAGECONTENT';
 757                                 break;
 758                 }
 759
 760                 return strtoupper( parent::tableName( $name, $format ) );
 761         }
 762
 763         function tableNameInternal( $name ) {
 764                 $name = $this->tableName( $name );
 765
 766                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 767         }
 768
 769         /**
 770          * Return the next in a sequence, save the value for retrieval via insertId()
 771          * @return null
 772          */
 773         function nextSequenceValue( $seqName ) {
 774                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 775                 $row = $this->fetchRow( $res );
 776                 $this->mInsertId = $row[0];
 777
 778                 return $this->mInsertId;
 779         }
 780
 781         /**
 782          * Return sequence_name if table has a sequence
 783          * @return bool
 784          */
 785         private function getSequenceData( $table ) {
 786                 if ( $this->sequenceData == null ) {
 787                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 788                                 lower(atc.table_name),
 789                                 lower(atc.column_name)
 790                         FROM all_sequences asq, all_tab_columns atc
 791                         WHERE decode(
 792                                         atc.table_name,
 793                                         '{$this->mTablePrefix}MWUSER',
 794                                         '{$this->mTablePrefix}USER',
 795                                         atc.table_name
 796                                 ) || '_' ||
 797                                 atc.column_name || '_SEQ' = '{$this->mTablePrefix}' || asq.sequence_name
 798                                 AND asq.sequence_owner = upper('{$this->mDBname}')
 799                                 AND atc.owner = upper('{$this->mDBname}')" );
 800
 801                         while ( ( $row = $result->fetchRow() ) !== false ) {
 802                                 $this->sequenceData[$row[1]] = array(
 803                                         'sequence' => $row[0],
 804                                         'column' => $row[2]
 805                                 );
 806                         }
 807                 }
 808                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 809
 810                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 811         }
 812
 813         # Returns the size of a text field, or -1 for "unlimited"
 814         function textFieldSize( $table, $field ) {
 815                 $fieldInfoData = $this->fieldInfo( $table, $field );
 816
 817                 return $fieldInfoData->maxLength();
 818         }
 819
 820         function limitResult( $sql, $limit, $offset = false ) {
 821                 if ( $offset === false ) {
 822                         $offset = 0;
 823                 }
 824
 825                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 826         }
 827
 828         function encodeBlob( $b ) {
 829                 return new Blob( $b );
 830         }
 831
 832         function decodeBlob( $b ) {
 833                 if ( $b instanceof Blob ) {
 834                         $b = $b->fetch();
 835                 }
 836
 837                 return $b;
 838         }
 839
 840         function unionQueries( $sqls, $all ) {
 841                 $glue = ' UNION ALL ';
 842
 843                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 844                         'FROM (' . implode( $glue, $sqls ) . ')';
 845         }
 846
 847         function wasDeadlock() {
 848                 return $this->lastErrno() == 'OCI-00060';
 849         }
 850
 851         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 852                 $fname = __METHOD__
 853         ) {
 854                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 855
 856                 $newName = strtoupper( $newName );
 857                 $oldName = strtoupper( $oldName );
 858
 859                 $tabName = substr( $newName, strlen( $this->mTablePrefix ) );
 860                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 861                 $newPrefix = strtoupper( $this->mTablePrefix );
 862
 863                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 864                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 865         }
 866
 867         function listTables( $prefix = null, $fname = __METHOD__ ) {
 868                 $listWhere = '';
 869                 if ( !empty( $prefix ) ) {
 870                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 871                 }
 872
 873                 $owner = strtoupper( $this->mDBname );
 874                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 875                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 876
 877                 // dirty code ... i know
 878                 $endArray = array();
 879                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 880                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 881                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 882                 $fixedOrderTabs = $endArray;
 883                 while ( ( $row = $result->fetchRow() ) !== false ) {
 884                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 885                                 $endArray[] = $row['table_name'];
 886                         }
 887                 }
 888
 889                 return $endArray;
 890         }
 891
 892         public function dropTable( $tableName, $fName = __METHOD__ ) {
 893                 $tableName = $this->tableName( $tableName );
 894                 if ( !$this->tableExists( $tableName ) ) {
 895                         return false;
 896                 }
 897
 898                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 899         }
 900
 901         function timestamp( $ts = 0 ) {
 902                 return wfTimestamp( TS_ORACLE, $ts );
 903         }
 904
 905         /**
 906          * Return aggregated value function call
 907          */
 908         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 909                 return $valuedata;
 910         }
 911
 912         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 913                 # Ignore errors during error handling to avoid infinite
 914                 # recursion
 915                 $ignore = $this->ignoreErrors( true );
 916                 ++$this->mErrorCount;
 917
 918                 if ( $ignore || $tempIgnore ) {
 919                         wfDebug( "SQL ERROR (ignored): $error\n" );
 920                         $this->ignoreErrors( $ignore );
 921                 } else {
 922                         throw new DBQueryError( $this, $error, $errno, $sql, $fname );
 923                 }
 924         }
 925
 926         /**
 927          * @return string wikitext of a link to the server software's web site
 928          */
 929         public function getSoftwareLink() {
 930                 return '[http://www.oracle.com/ Oracle]';
 931         }
 932
 933         /**
 934          * @return string Version information from the database
 935          */
 936         function getServerVersion() {
 937                 //better version number, fallback on driver
 938                 $rset = $this->doQuery(
 939                         'SELECT version FROM product_component_version ' .
 940                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 941                 );
 942                 if ( !( $row = $rset->fetchRow() ) ) {
 943                         return oci_server_version( $this->mConn );
 944                 }
 945
 946                 return $row['version'];
 947         }
 948
 949         /**
 950          * Query whether a given index exists
 951          * @return bool
 952          */
 953         function indexExists( $table, $index, $fname = __METHOD__ ) {
 954                 $table = $this->tableName( $table );
 955                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 956                 $index = strtoupper( $index );
 957                 $owner = strtoupper( $this->mDBname );
 958                 $SQL = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 959                 $res = $this->doQuery( $SQL );
 960                 if ( $res ) {
 961                         $count = $res->numRows();
 962                         $res->free();
 963                 } else {
 964                         $count = 0;
 965                 }
 966
 967                 return $count != 0;
 968         }
 969
 970         /**
 971          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 972          * @return bool
 973          */
 974         function tableExists( $table, $fname = __METHOD__ ) {
 975                 $table = $this->tableName( $table );
 976                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 977                 $owner = $this->addQuotes( strtoupper( $this->mDBname ) );
 978                 $SQL = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 979                 $res = $this->doQuery( $SQL );
 980                 if ( $res && $res->numRows() > 0 ) {
 981                         $exists = true;
 982                 } else {
 983                         $exists = false;
 984                 }
 985
 986                 $res->free();
 987
 988                 return $exists;
 989         }
 990
 991         /**
 992          * Function translates mysql_fetch_field() functionality on ORACLE.
 993          * Caching is present for reducing query time.
 994          * For internal calls. Use fieldInfo for normal usage.
 995          * Returns false if the field doesn't exist
 996          *
 997          * @param $table Array
 998          * @param $field String
 999          * @return ORAField|ORAResult
1000          */
1001         private function fieldInfoMulti( $table, $field ) {
1002                 $field = strtoupper( $field );
1003                 if ( is_array( $table ) ) {
1004                         $table = array_map( array( &$this, 'tableNameInternal' ), $table );
1005                         $tableWhere = 'IN (';
1006                         foreach ( $table as &$singleTable ) {
1007                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
1008                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
1009                                         return $this->mFieldInfoCache["$singleTable.$field"];
1010                                 }
1011                                 $tableWhere .= '\'' . $singleTable . '\',';
1012                         }
1013                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
1014                 } else {
1015                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
1016                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
1017                                 return $this->mFieldInfoCache["$table.$field"];
1018                         }
1019                         $tableWhere = '= \'' . $table . '\'';
1020                 }
1021
1022                 $fieldInfoStmt = oci_parse(
1023                         $this->mConn,
1024                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
1025                                 $tableWhere . ' and column_name = \'' . $field . '\''
1026                 );
1027                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
1028                         $e = oci_error( $fieldInfoStmt );
1029                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
1030
1031                         return false;
1032                 }
1033                 $res = new ORAResult( $this, $fieldInfoStmt );
1034                 if ( $res->numRows() == 0 ) {
1035                         if ( is_array( $table ) ) {
1036                                 foreach ( $table as &$singleTable ) {
1037                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
1038                                 }
1039                         } else {
1040                                 $this->mFieldInfoCache["$table.$field"] = false;
1041                         }
1042                         $fieldInfoTemp = null;
1043                 } else {
1044                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
1045                         $table = $fieldInfoTemp->tableName();
1046                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
1047                 }
1048                 $res->free();
1049
1050                 return $fieldInfoTemp;
1051         }
1052
1053         /**
1054          * @throws DBUnexpectedError
1055          * @param  $table
1056          * @param  $field
1057          * @return ORAField
1058          */
1059         function fieldInfo( $table, $field ) {
1060                 if ( is_array( $table ) ) {
1061                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
1062                 }
1063
1064                 return $this->fieldInfoMulti( $table, $field );
1065         }
1066
1067         protected function doBegin( $fname = __METHOD__ ) {
1068                 $this->mTrxLevel = 1;
1069                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
1070         }
1071
1072         protected function doCommit( $fname = __METHOD__ ) {
1073                 if ( $this->mTrxLevel ) {
1074                         $ret = oci_commit( $this->mConn );
1075                         if ( !$ret ) {
1076                                 throw new DBUnexpectedError( $this, $this->lastError() );
1077                         }
1078                         $this->mTrxLevel = 0;
1079                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
1080                 }
1081         }
1082
1083         protected function doRollback( $fname = __METHOD__ ) {
1084                 if ( $this->mTrxLevel ) {
1085                         oci_rollback( $this->mConn );
1086                         $this->mTrxLevel = 0;
1087                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
1088                 }
1089         }
1090
1091         /* defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}'; */
1092         function sourceStream( $fp, $lineCallback = false, $resultCallback = false,
1093                 $fname = __METHOD__, $inputCallback = false ) {
1094                 $cmd = '';
1095                 $done = false;
1096                 $dollarquote = false;
1097
1098                 $replacements = array();
1099
1100                 while ( !feof( $fp ) ) {
1101                         if ( $lineCallback ) {
1102                                 call_user_func( $lineCallback );
1103                         }
1104                         $line = trim( fgets( $fp, 1024 ) );
1105                         $sl = strlen( $line ) - 1;
1106
1107                         if ( $sl < 0 ) {
1108                                 continue;
1109                         }
1110                         if ( '-' == $line[0] && '-' == $line[1] ) {
1111                                 continue;
1112                         }
1113
1114                         // Allow dollar quoting for function declarations
1115                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
1116                                 if ( $dollarquote ) {
1117                                         $dollarquote = false;
1118                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
1119                                         $done = true;
1120                                 } else {
1121                                         $dollarquote = true;
1122                                 }
1123                         } elseif ( !$dollarquote ) {
1124                                 if ( ';' == $line[$sl] && ( $sl < 2 || ';' != $line[$sl - 1] ) ) {
1125                                         $done = true;
1126                                         $line = substr( $line, 0, $sl );
1127                                 }
1128                         }
1129
1130                         if ( $cmd != '' ) {
1131                                 $cmd .= ' ';
1132                         }
1133                         $cmd .= "$line\n";
1134
1135                         if ( $done ) {
1136                                 $cmd = str_replace( ';;', ";", $cmd );
1137                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1138                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1139                                                 $replacements[$defines[2]] = $defines[1];
1140                                         }
1141                                 } else {
1142                                         foreach ( $replacements as $mwVar => $scVar ) {
1143                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1144                                         }
1145
1146                                         $cmd = $this->replaceVars( $cmd );
1147                                         if ( $inputCallback ) {
1148                                                 call_user_func( $inputCallback, $cmd );
1149                                         }
1150                                         $res = $this->doQuery( $cmd );
1151                                         if ( $resultCallback ) {
1152                                                 call_user_func( $resultCallback, $res, $this );
1153                                         }
1154
1155                                         if ( false === $res ) {
1156                                                 $err = $this->lastError();
1157
1158                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1159                                         }
1160                                 }
1161
1162                                 $cmd = '';
1163                                 $done = false;
1164                         }
1165                 }
1166
1167                 return true;
1168         }
1169
1170         function selectDB( $db ) {
1171                 $this->mDBname = $db;
1172                 if ( $db == null || $db == $this->mUser ) {
1173                         return true;
1174                 }
1175                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper( $db );
1176                 $stmt = oci_parse( $this->mConn, $sql );
1177                 wfSuppressWarnings();
1178                 $success = oci_execute( $stmt );
1179                 wfRestoreWarnings();
1180                 if ( !$success ) {
1181                         $e = oci_error( $stmt );
1182                         if ( $e['code'] != '1435' ) {
1183                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1184                         }
1185
1186                         return false;
1187                 }
1188
1189                 return true;
1190         }
1191
1192         function strencode( $s ) {
1193                 return str_replace( "'", "''", $s );
1194         }
1195
1196         function addQuotes( $s ) {
1197                 global $wgContLang;
1198                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1199                         $s = $wgContLang->checkTitleEncoding( $s );
1200                 }
1201
1202                 return "'" . $this->strencode( $s ) . "'";
1203         }
1204
1205         public function addIdentifierQuotes( $s ) {
1206                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1207                         $s = '/*Q*/' . $s;
1208                 }
1209
1210                 return $s;
1211         }
1212
1213         public function removeIdentifierQuotes( $s ) {
1214                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1215         }
1216
1217         public function isQuotedIdentifier( $s ) {
1218                 return strpos( $s, '/*Q*/' ) !== false;
1219         }
1220
1221         private function wrapFieldForWhere( $table, &$col, &$val ) {
1222                 global $wgContLang;
1223
1224                 $col_info = $this->fieldInfoMulti( $table, $col );
1225                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1226                 if ( $col_type == 'CLOB' ) {
1227                         $col = 'TO_CHAR(' . $col . ')';
1228                         $val = $wgContLang->checkTitleEncoding( $val );
1229                 } elseif ( $col_type == 'VARCHAR2' ) {
1230                         $val = $wgContLang->checkTitleEncoding( $val );
1231                 }
1232         }
1233
1234         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1235                 $conds2 = array();
1236                 foreach ( $conds as $col => $val ) {
1237                         if ( is_array( $val ) ) {
1238                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1239                         } else {
1240                                 if ( is_numeric( $col ) && $parentCol != null ) {
1241                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1242                                 } else {
1243                                         $this->wrapFieldForWhere( $table, $col, $val );
1244                                 }
1245                                 $conds2[$col] = $val;
1246                         }
1247                 }
1248
1249                 return $conds2;
1250         }
1251
1252         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1253                 $options = array(), $join_conds = array()
1254         ) {
1255                 if ( is_array( $conds ) ) {
1256                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1257                 }
1258
1259                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1260         }
1261
1262         /**
1263          * Returns an optional USE INDEX clause to go after the table, and a
1264          * string to go at the end of the query
1265          *
1266          * @private
1267          *
1268          * @param array $options an associative array of options to be turned into
1269          *              an SQL query, valid keys are listed in the function.
1270          * @return array
1271          */
1272         function makeSelectOptions( $options ) {
1273                 $preLimitTail = $postLimitTail = '';
1274                 $startOpts = '';
1275
1276                 $noKeyOptions = array();
1277                 foreach ( $options as $key => $option ) {
1278                         if ( is_numeric( $key ) ) {
1279                                 $noKeyOptions[$option] = true;
1280                         }
1281                 }
1282
1283                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1284
1285                 $preLimitTail .= $this->makeOrderBy( $options );
1286
1287                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1288                         $postLimitTail .= ' FOR UPDATE';
1289                 }
1290
1291                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1292                         $startOpts .= 'DISTINCT';
1293                 }
1294
1295                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1296                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1297                 } else {
1298                         $useIndex = '';
1299                 }
1300
1301                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1302         }
1303
1304         public function delete( $table, $conds, $fname = __METHOD__ ) {
1305                 if ( is_array( $conds ) ) {
1306                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1307                 }
1308                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1309                 // all deletions on these tables have transactions so final failure rollbacks these updates
1310                 $table = $this->tableName( $table );
1311                 if ( $table == $this->tableName( 'user' ) ) {
1312                         $this->update( 'archive', array( 'ar_user' => 0 ),
1313                                 array( 'ar_user' => $conds['user_id'] ), $fname );
1314                         $this->update( 'ipblocks', array( 'ipb_user' => 0 ),
1315                                 array( 'ipb_user' => $conds['user_id'] ), $fname );
1316                         $this->update( 'image', array( 'img_user' => 0 ),
1317                                 array( 'img_user' => $conds['user_id'] ), $fname );
1318                         $this->update( 'oldimage', array( 'oi_user' => 0 ),
1319                                 array( 'oi_user' => $conds['user_id'] ), $fname );
1320                         $this->update( 'filearchive', array( 'fa_deleted_user' => 0 ),
1321                                 array( 'fa_deleted_user' => $conds['user_id'] ), $fname );
1322                         $this->update( 'filearchive', array( 'fa_user' => 0 ),
1323                                 array( 'fa_user' => $conds['user_id'] ), $fname );
1324                         $this->update( 'uploadstash', array( 'us_user' => 0 ),
1325                                 array( 'us_user' => $conds['user_id'] ), $fname );
1326                         $this->update( 'recentchanges', array( 'rc_user' => 0 ),
1327                                 array( 'rc_user' => $conds['user_id'] ), $fname );
1328                         $this->update( 'logging', array( 'log_user' => 0 ),
1329                                 array( 'log_user' => $conds['user_id'] ), $fname );
1330                 } elseif ( $table == $this->tableName( 'image' ) ) {
1331                         $this->update( 'oldimage', array( 'oi_name' => 0 ),
1332                                 array( 'oi_name' => $conds['img_name'] ), $fname );
1333                 }
1334
1335                 return parent::delete( $table, $conds, $fname );
1336         }
1337
1338         function update( $table, $values, $conds, $fname = __METHOD__, $options = array() ) {
1339                 global $wgContLang;
1340
1341                 $table = $this->tableName( $table );
1342                 $opts = $this->makeUpdateOptions( $options );
1343                 $sql = "UPDATE $opts $table SET ";
1344
1345                 $first = true;
1346                 foreach ( $values as $col => &$val ) {
1347                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1348
1349                         if ( !$first ) {
1350                                 $sqlSet = ', ' . $sqlSet;
1351                         } else {
1352                                 $first = false;
1353                         }
1354                         $sql .= $sqlSet;
1355                 }
1356
1357                 if ( $conds !== array() && $conds !== '*' ) {
1358                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1359                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1360                 }
1361
1362                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
1363                         $e = oci_error( $this->mConn );
1364                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1365
1366                         return false;
1367                 }
1368                 foreach ( $values as $col => &$val ) {
1369                         $col_info = $this->fieldInfoMulti( $table, $col );
1370                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1371
1372                         if ( $val === null ) {
1373                                 // do nothing ... null was inserted in statement creation
1374                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1375                                 if ( is_object( $val ) ) {
1376                                         $val = $val->getData();
1377                                 }
1378
1379                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1380                                         $val = '31-12-2030 12:00:00.000000';
1381                                 }
1382
1383                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1384                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1385                                         $e = oci_error( $stmt );
1386                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1387
1388                                         return false;
1389                                 }
1390                         } else {
1391                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
1392                                         $e = oci_error( $stmt );
1393                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1394                                 }
1395
1396                                 if ( $col_type == 'BLOB' ) {
1397                                         $lob[$col]->writeTemporary( $val );
1398                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1399                                 } else {
1400                                         $lob[$col]->writeTemporary( $val );
1401                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1402                                 }
1403                         }
1404                 }
1405
1406                 wfSuppressWarnings();
1407
1408                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1409                         $e = oci_error( $stmt );
1410                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
1411                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1412
1413                                 return false;
1414                         } else {
1415                                 $this->mAffectedRows = oci_num_rows( $stmt );
1416                         }
1417                 } else {
1418                         $this->mAffectedRows = oci_num_rows( $stmt );
1419                 }
1420
1421                 wfRestoreWarnings();
1422
1423                 if ( isset( $lob ) ) {
1424                         foreach ( $lob as $lob_v ) {
1425                                 $lob_v->free();
1426                         }
1427                 }
1428
1429                 if ( !$this->mTrxLevel ) {
1430                         oci_commit( $this->mConn );
1431                 }
1432
1433                 oci_free_statement( $stmt );
1434         }
1435
1436         function bitNot( $field ) {
1437                 // expecting bit-fields smaller than 4bytes
1438                 return 'BITNOT(' . $field . ')';
1439         }
1440
1441         function bitAnd( $fieldLeft, $fieldRight ) {
1442                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1443         }
1444
1445         function bitOr( $fieldLeft, $fieldRight ) {
1446                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1447         }
1448
1449         function setFakeMaster( $enabled = true ) {
1450         }
1451
1452         function getDBname() {
1453                 return $this->mDBname;
1454         }
1455
1456         function getServer() {
1457                 return $this->mServer;
1458         }
1459
1460         public function buildGroupConcatField(
1461                 $delim, $table, $field, $conds = '', $join_conds = array()
1462         ) {
1463                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1464
1465                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, array(), $join_conds ) . ')';
1466         }
1467
1468         public function getSearchEngine() {
1469                 return 'SearchOracle';
1470         }
1471
1472         public function getInfinity() {
1473                 return '31-12-2030 12:00:00.000000';
1474         }
1475 } // end DatabaseOracle class