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