includes/db/DatabaseOracle.php

   1 <?php
   2 /**
   3  * This is the Oracle database abstraction layer.
   4  *
   5  * @file
   6  * @ingroup Database
   7  */
   8
   9 /**
  10  * @ingroup Database
  11  */
  12 class ORABlob {
  13         var $mData;
  14
  15         function __construct( $data ) {
  16                 $this->mData = $data;
  17         }
  18
  19         function getData() {
  20                 return $this->mData;
  21         }
  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 $array_out;
  50         }
  51
  52         function __construct( &$db, $stmt, $unique = false ) {
  53                 $this->db =& $db;
  54
  55                 if ( ( $this->nrows = oci_fetch_all( $stmt, $this->rows, 0, - 1, OCI_FETCHSTATEMENT_BY_ROW | OCI_NUM ) ) === false ) {
  56                         $e = oci_error( $stmt );
  57                         $db->reportQueryError( $e['message'], $e['code'], '', __METHOD__ );
  58                         $this->free();
  59                         return;
  60                 }
  61
  62                 if ( $unique ) {
  63                         $this->rows = $this->array_unique_md( $this->rows );
  64                         $this->nrows = count( $this->rows );
  65                 }
  66
  67                 if ($this->nrows > 0) {
  68                         foreach ( $this->rows[0] as $k => $v ) {
  69                                 $this->columns[$k] = strtolower( oci_field_name( $stmt, $k + 1 ) );
  70                         }
  71                 }
  72
  73                 $this->cursor = 0;
  74                 oci_free_statement( $stmt );
  75         }
  76
  77         public function free() {
  78                 unset($this->db);
  79         }
  80
  81         public function seek( $row ) {
  82                 $this->cursor = min( $row, $this->nrows );
  83         }
  84
  85         public function numRows() {
  86                 return $this->nrows;
  87         }
  88
  89         public function numFields() {
  90                 return count($this->columns);
  91         }
  92
  93         public function fetchObject() {
  94                 if ( $this->cursor >= $this->nrows ) {
  95                         return false;
  96                 }
  97                 $row = $this->rows[$this->cursor++];
  98                 $ret = new stdClass();
  99                 foreach ( $row as $k => $v ) {
 100                         $lc = $this->columns[$k];
 101                         $ret->$lc = $v;
 102                 }
 103
 104                 return $ret;
 105         }
 106
 107         public function fetchRow() {
 108                 if ( $this->cursor >= $this->nrows ) {
 109                         return false;
 110                 }
 111
 112                 $row = $this->rows[$this->cursor++];
 113                 $ret = array();
 114                 foreach ( $row as $k => $v ) {
 115                         $lc = $this->columns[$k];
 116                         $ret[$lc] = $v;
 117                         $ret[$k] = $v;
 118                 }
 119                 return $ret;
 120         }
 121 }
 122
 123 /**
 124  * Utility class.
 125  * @ingroup Database
 126  */
 127 class ORAField implements Field {
 128         private $name, $tablename, $default, $max_length, $nullable,
 129                 $is_pk, $is_unique, $is_multiple, $is_key, $type;
 130
 131         function __construct( $info ) {
 132                 $this->name = $info['column_name'];
 133                 $this->tablename = $info['table_name'];
 134                 $this->default = $info['data_default'];
 135                 $this->max_length = $info['data_length'];
 136                 $this->nullable = $info['not_null'];
 137                 $this->is_pk = isset( $info['prim'] ) && $info['prim'] == 1 ? 1 : 0;
 138                 $this->is_unique = isset( $info['uniq'] ) && $info['uniq'] == 1 ? 1 : 0;
 139                 $this->is_multiple = isset( $info['nonuniq'] ) && $info['nonuniq'] == 1 ? 1 : 0;
 140                 $this->is_key = ( $this->is_pk || $this->is_unique || $this->is_multiple );
 141                 $this->type = $info['data_type'];
 142         }
 143
 144         function name() {
 145                 return $this->name;
 146         }
 147
 148         function tableName() {
 149                 return $this->tablename;
 150         }
 151
 152         function defaultValue() {
 153                 return $this->default;
 154         }
 155
 156         function maxLength() {
 157                 return $this->max_length;
 158         }
 159
 160         function isNullable() {
 161                 return $this->nullable;
 162         }
 163
 164         function isKey() {
 165                 return $this->is_key;
 166         }
 167
 168         function isMultipleKey() {
 169                 return $this->is_multiple;
 170         }
 171
 172         function type() {
 173                 return $this->type;
 174         }
 175 }
 176
 177 /**
 178  * @ingroup Database
 179  */
 180 class DatabaseOracle extends DatabaseBase {
 181         var $mInsertId = null;
 182         var $mLastResult = null;
 183         var $numeric_version = null;
 184         var $lastResult = null;
 185         var $cursor = 0;
 186         var $mAffectedRows;
 187
 188         var $ignore_DUP_VAL_ON_INDEX = false;
 189         var $sequenceData = null;
 190
 191         var $defaultCharset = 'AL32UTF8';
 192
 193         var $mFieldInfoCache = array();
 194
 195         function __construct( $server = false, $user = false, $password = false, $dbName = false,
 196                 $flags = 0, $tablePrefix = 'get from global' )
 197         {
 198                 $tablePrefix = $tablePrefix == 'get from global' ? $tablePrefix : strtoupper( $tablePrefix );
 199                 parent::__construct( $server, $user, $password, $dbName, $flags, $tablePrefix );
 200                 wfRunHooks( 'DatabaseOraclePostInit', array( &$this ) );
 201         }
 202
 203         function getType() {
 204                 return 'oracle';
 205         }
 206
 207         function cascadingDeletes() {
 208                 return true;
 209         }
 210         function cleanupTriggers() {
 211                 return true;
 212         }
 213         function strictIPs() {
 214                 return true;
 215         }
 216         function realTimestamps() {
 217                 return true;
 218         }
 219         function implicitGroupby() {
 220                 return false;
 221         }
 222         function implicitOrderby() {
 223                 return false;
 224         }
 225         function searchableIPs() {
 226                 return true;
 227         }
 228
 229         /**
 230          * Usually aborts on failure
 231          */
 232         function open( $server, $user, $password, $dbName ) {
 233                 if ( !function_exists( 'oci_connect' ) ) {
 234                         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" );
 235                 }
 236
 237                 $this->close();
 238                 $this->mUser = $user;
 239                 $this->mPassword = $password;
 240                 // changed internal variables functions
 241                 // mServer now holds the TNS endpoint
 242                 // mDBname is schema name if different from username
 243                 if ( !$server ) {
 244                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 245                         $this->mServer = $dbName;
 246                         $this->mDBname = $user;
 247                 } else {
 248                         $this->mServer = $server;
 249                         if ( !$dbName ) {
 250                                 $this->mDBname = $user;
 251                         } else {
 252                                 $this->mDBname = $dbName;
 253                         }
 254                 }
 255
 256                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 257                         return;
 258                 }
 259
 260                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 261                 if ( $this->mFlags & DBO_DEFAULT ) {
 262                         $this->mConn = oci_new_connect( $this->mUser, $this->mPassword, $this->mServer, $this->defaultCharset, $session_mode );
 263                 } else {
 264                         $this->mConn = oci_connect( $this->mUser, $this->mPassword, $this->mServer, $this->defaultCharset, $session_mode );
 265                 }
 266
 267                 if ( $this->mUser != $this->mDBname ) {
 268                         //change current schema in session
 269                         $this->selectDB( $this->mDBname );
 270                 }
 271
 272                 if ( !$this->mConn ) {
 273                         throw new DBConnectionError( $this, $this->lastError() );
 274                 }
 275
 276                 $this->mOpened = true;
 277
 278                 # removed putenv calls because they interfere with the system globaly
 279                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 280                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 281                 return $this->mConn;
 282         }
 283
 284         /**
 285          * Closes a database connection, if it is open
 286          * Returns success, true if already closed
 287          */
 288         function close() {
 289                 $this->mOpened = false;
 290                 if ( $this->mConn ) {
 291                         return oci_close( $this->mConn );
 292                 } else {
 293                         return true;
 294                 }
 295         }
 296
 297         function execFlags() {
 298                 return $this->mTrxLevel ? OCI_DEFAULT : OCI_COMMIT_ON_SUCCESS;
 299         }
 300
 301         function doQuery( $sql ) {
 302                 wfDebug( "SQL: [$sql]\n" );
 303                 if ( !mb_check_encoding( $sql ) ) {
 304                         throw new MWException( "SQL encoding is invalid\n$sql" );
 305                 }
 306
 307                 // handle some oracle specifics
 308                 // remove AS column/table/subquery namings
 309                 if( !$this->getFlag( DBO_DDLMODE ) ) {
 310                         $sql = preg_replace( '/ as /i', ' ', $sql );
 311                 }
 312
 313                 // Oracle has issues with UNION clause if the statement includes LOB fields
 314                 // So we do a UNION ALL and then filter the results array with array_unique
 315                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 316                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 317                 // you have to select data from plan table after explain
 318                 $explain_id = date( 'dmYHis' );
 319
 320                 $sql = preg_replace( '/^EXPLAIN /', 'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR', $sql, 1, $explain_count );
 321
 322                 wfSuppressWarnings();
 323
 324                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 325                         $e = oci_error( $this->mConn );
 326                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 327                         return false;
 328                 }
 329
 330                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 331                         $e = oci_error( $stmt );
 332                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 333                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 334                                 return false;
 335                         }
 336                 }
 337
 338                 wfRestoreWarnings();
 339
 340                 if ( $explain_count > 0 ) {
 341                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table WHERE statement_id = \'' . $explain_id . '\'' );
 342                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 343                         return new ORAResult( $this, $stmt, $union_unique );
 344                 } else {
 345                         $this->mAffectedRows = oci_num_rows( $stmt );
 346                         return true;
 347                 }
 348         }
 349
 350         function queryIgnore( $sql, $fname = '' ) {
 351                 return $this->query( $sql, $fname, true );
 352         }
 353
 354         function freeResult( $res ) {
 355                 if ( $res instanceof ResultWrapper ) {
 356                         $res = $res->result;
 357                 }
 358
 359                 $res->free();
 360         }
 361
 362         function fetchObject( $res ) {
 363                 if ( $res instanceof ResultWrapper ) {
 364                         $res = $res->result;
 365                 }
 366
 367                 return $res->fetchObject();
 368         }
 369
 370         function fetchRow( $res ) {
 371                 if ( $res instanceof ResultWrapper ) {
 372                         $res = $res->result;
 373                 }
 374
 375                 return $res->fetchRow();
 376         }
 377
 378         function numRows( $res ) {
 379                 if ( $res instanceof ResultWrapper ) {
 380                         $res = $res->result;
 381                 }
 382
 383                 return $res->numRows();
 384         }
 385
 386         function numFields( $res ) {
 387                 if ( $res instanceof ResultWrapper ) {
 388                         $res = $res->result;
 389                 }
 390
 391                 return $res->numFields();
 392         }
 393
 394         function fieldName( $stmt, $n ) {
 395                 return oci_field_name( $stmt, $n );
 396         }
 397
 398         /**
 399          * This must be called after nextSequenceVal
 400          */
 401         function insertId() {
 402                 return $this->mInsertId;
 403         }
 404
 405         function dataSeek( $res, $row ) {
 406                 if ( $res instanceof ORAResult ) {
 407                         $res->seek( $row );
 408                 } else {
 409                         $res->result->seek( $row );
 410                 }
 411         }
 412
 413         function lastError() {
 414                 if ( $this->mConn === false ) {
 415                         $e = oci_error();
 416                 } else {
 417                         $e = oci_error( $this->mConn );
 418                 }
 419                 return $e['message'];
 420         }
 421
 422         function lastErrno() {
 423                 if ( $this->mConn === false ) {
 424                         $e = oci_error();
 425                 } else {
 426                         $e = oci_error( $this->mConn );
 427                 }
 428                 return $e['code'];
 429         }
 430
 431         function affectedRows() {
 432                 return $this->mAffectedRows;
 433         }
 434
 435         /**
 436          * Returns information about an index
 437          * If errors are explicitly ignored, returns NULL on failure
 438          */
 439         function indexInfo( $table, $index, $fname = 'DatabaseOracle::indexExists' ) {
 440                 return false;
 441         }
 442
 443         function indexUnique( $table, $index, $fname = 'DatabaseOracle::indexUnique' ) {
 444                 return false;
 445         }
 446
 447         function insert( $table, $a, $fname = 'DatabaseOracle::insert', $options = array() ) {
 448                 if ( !count( $a ) ) {
 449                         return true;
 450                 }
 451
 452                 if ( !is_array( $options ) ) {
 453                         $options = array( $options );
 454                 }
 455
 456                 if ( in_array( 'IGNORE', $options ) ) {
 457                         $this->ignore_DUP_VAL_ON_INDEX = true;
 458                 }
 459
 460                 if ( !is_array( reset( $a ) ) ) {
 461                         $a = array( $a );
 462                 }
 463
 464                 foreach ( $a as &$row ) {
 465                         $this->insertOneRow( $table, $row, $fname );
 466                 }
 467                 $retVal = true;
 468
 469                 if ( in_array( 'IGNORE', $options ) ) {
 470                         $this->ignore_DUP_VAL_ON_INDEX = false;
 471                 }
 472
 473                 return $retVal;
 474         }
 475
 476         private function fieldBindStatement ( $table, $col, &$val, $includeCol = false ) {
 477                 $col_info = $this->fieldInfoMulti( $table, $col );
 478                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 479
 480                 $bind = '';
 481                 if ( is_numeric( $col ) ) {
 482                         $bind = $val;
 483                         $val = null;
 484                         return $bind;
 485                 } else if ( $includeCol ) {
 486                         $bind = "$col = ";
 487                 }
 488
 489                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 490                         $val = null;
 491                 }
 492
 493                 if ( $val === null ) {
 494                         if ( $col_info != false && $col_info->nullable() == 0 && $col_info->defaultValue() != null ) {
 495                                 $bind .= 'DEFAULT';
 496                         } else {
 497                                 $bind .= 'NULL';
 498                         }
 499                 } else {
 500                         $bind .= ':' . $col;
 501                 }
 502
 503                 return $bind;
 504         }
 505
 506         private function insertOneRow( $table, $row, $fname ) {
 507                 global $wgContLang;
 508
 509                 $table = $this->tableName( $table );
 510                 // "INSERT INTO tables (a, b, c)"
 511                 $sql = "INSERT INTO " . $table . " (" . join( ',', array_keys( $row ) ) . ')';
 512                 $sql .= " VALUES (";
 513
 514                 // for each value, append ":key"
 515                 $first = true;
 516                 foreach ( $row as $col => &$val ) {
 517                         if ( !$first ) {
 518                                 $sql .= ', ';
 519                         } else {
 520                                 $first = false;
 521                         }
 522
 523                         $sql .= $this->fieldBindStatement( $table, $col, $val );
 524                 }
 525                 $sql .= ')';
 526
 527                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 528                         $e = oci_error( $this->mConn );
 529                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 530                         return false;
 531                 }
 532                 foreach ( $row as $col => &$val ) {
 533                         $col_info = $this->fieldInfoMulti( $table, $col );
 534                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 535
 536                         if ( $val === null ) {
 537                                 // do nothing ... null was inserted in statement creation
 538                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 539                                 if ( is_object( $val ) ) {
 540                                         $val = $val->fetch();
 541                                 }
 542
 543                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 544                                         $val = '31-12-2030 12:00:00.000000';
 545                                 }
 546
 547                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 548                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
 549                                         $e = oci_error( $stmt );
 550                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 551                                         return false;
 552                                 }
 553                         } else {
 554                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
 555                                         $e = oci_error( $stmt );
 556                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 557                                 }
 558
 559                                 if ( is_object( $val ) ) {
 560                                         $val = $val->fetch();
 561                                 }
 562
 563                                 if ( $col_type == 'BLOB' ) {
 564                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 565                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_BLOB );
 566                                 } else {
 567                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 568                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_CLOB );
 569                                 }
 570                         }
 571                 }
 572
 573                 wfSuppressWarnings();
 574
 575                 if ( oci_execute( $stmt, OCI_DEFAULT ) === false ) {
 576                         $e = oci_error( $stmt );
 577                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 578                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 579                                 return false;
 580                         } else {
 581                                 $this->mAffectedRows = oci_num_rows( $stmt );
 582                         }
 583                 } else {
 584                         $this->mAffectedRows = oci_num_rows( $stmt );
 585                 }
 586
 587                 wfRestoreWarnings();
 588
 589                 if ( isset( $lob ) ) {
 590                         foreach ( $lob as $lob_v ) {
 591                                 $lob_v->free();
 592                         }
 593                 }
 594
 595                 if ( !$this->mTrxLevel ) {
 596                         oci_commit( $this->mConn );
 597                 }
 598
 599                 oci_free_statement( $stmt );
 600         }
 601
 602         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabaseOracle::insertSelect',
 603                 $insertOptions = array(), $selectOptions = array() )
 604         {
 605                 $destTable = $this->tableName( $destTable );
 606                 if ( !is_array( $selectOptions ) ) {
 607                         $selectOptions = array( $selectOptions );
 608                 }
 609                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 610                 if ( is_array( $srcTable ) ) {
 611                         $srcTable =  implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 612                 } else {
 613                         $srcTable = $this->tableName( $srcTable );
 614                 }
 615
 616                 if ( ( $sequenceData = $this->getSequenceData( $destTable ) ) !== false &&
 617                                 !isset( $varMap[$sequenceData['column']] ) )
 618                 {
 619                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 620                 }
 621
 622                 // count-alias subselect fields to avoid abigious definition errors
 623                 $i = 0;
 624                 foreach ( $varMap as &$val ) {
 625                         $val = $val . ' field' . ( $i++ );
 626                 }
 627
 628                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 629                         " SELECT $startOpts " . implode( ',', $varMap ) .
 630                         " FROM $srcTable $useIndex ";
 631                 if ( $conds != '*' ) {
 632                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 633                 }
 634                 $sql .= " $tailOpts";
 635
 636                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 637                         $this->ignore_DUP_VAL_ON_INDEX = true;
 638                 }
 639
 640                 $retval = $this->query( $sql, $fname );
 641
 642                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 643                         $this->ignore_DUP_VAL_ON_INDEX = false;
 644                 }
 645
 646                 return $retval;
 647         }
 648
 649         function tableName( $name ) {
 650                 global $wgSharedDB, $wgSharedPrefix, $wgSharedTables;
 651                 /*
 652                 Replace reserved words with better ones
 653                 Using uppercase because that's the only way Oracle can handle
 654                 quoted tablenames
 655                 */
 656                 switch( $name ) {
 657                         case 'user':
 658                                 $name = 'MWUSER';
 659                                 break;
 660                         case 'text':
 661                                 $name = 'PAGECONTENT';
 662                                 break;
 663                 }
 664
 665                 /*
 666                         The rest of procedure is equal to generic Databse class
 667                         except for the quoting style
 668                 */
 669                 if ( $name[0] == '"' && substr( $name, - 1, 1 ) == '"' ) {
 670                         return $name;
 671                 }
 672                 if ( preg_match( '/(^|\s)(DISTINCT|JOIN|ON|AS)(\s|$)/i', $name ) !== 0 ) {
 673                         return $name;
 674                 }
 675                 $dbDetails = array_reverse( explode( '.', $name, 2 ) );
 676                 if ( isset( $dbDetails[1] ) ) {
 677                         @list( $table, $database ) = $dbDetails;
 678                 } else {
 679                         @list( $table ) = $dbDetails;
 680                 }
 681
 682                 $prefix = $this->mTablePrefix;
 683
 684                 if ( isset( $database ) ) {
 685                         $table = ( $table[0] == '`' ? $table : "`{$table}`" );
 686                 }
 687
 688                 if ( !isset( $database ) && isset( $wgSharedDB ) && $table[0] != '"'
 689                         && isset( $wgSharedTables )
 690                         && is_array( $wgSharedTables )
 691                         && in_array( $table, $wgSharedTables )
 692                 ) {
 693                         $database = $wgSharedDB;
 694                         $prefix   = isset( $wgSharedPrefix ) ? $wgSharedPrefix : $prefix;
 695                 }
 696
 697                 if ( isset( $database ) ) {
 698                         $database = ( $database[0] == '"' ? $database : "\"{$database}\"" );
 699                 }
 700                 $table = ( $table[0] == '"') ? $table : "\"{$prefix}{$table}\"" ;
 701
 702                 $tableName = ( isset( $database ) ? "{$database}.{$table}" : "{$table}" );
 703
 704                 return strtoupper( $tableName );
 705         }
 706
 707         /**
 708          * Return the next in a sequence, save the value for retrieval via insertId()
 709          */
 710         function nextSequenceValue( $seqName ) {
 711                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 712                 $row = $this->fetchRow( $res );
 713                 $this->mInsertId = $row[0];
 714                 return $this->mInsertId;
 715         }
 716
 717         /**
 718          * Return sequence_name if table has a sequence
 719          */
 720         private function getSequenceData( $table ) {
 721                 if ( $this->sequenceData == null ) {
 722                         $result = $this->doQuery( 'SELECT lower(us.sequence_name), lower(utc.table_name), lower(utc.column_name) from user_sequences us, user_tab_columns utc where us.sequence_name = utc.table_name||\'_\'||utc.column_name||\'_SEQ\'' );
 723
 724                         while ( ( $row = $result->fetchRow() ) !== false ) {
 725                                 $this->sequenceData[$this->tableName( $row[1] )] = array(
 726                                         'sequence' => $row[0],
 727                                         'column' => $row[2]
 728                                 );
 729                         }
 730                 }
 731
 732                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 733         }
 734
 735         /**
 736          * REPLACE query wrapper
 737          * Oracle simulates this with a DELETE followed by INSERT
 738          * $row is the row to insert, an associative array
 739          * $uniqueIndexes is an array of indexes. Each element may be either a
 740          * field name or an array of field names
 741          *
 742          * It may be more efficient to leave off unique indexes which are unlikely to collide.
 743          * However if you do this, you run the risk of encountering errors which wouldn't have
 744          * occurred in MySQL.
 745          *
 746          * @param $table String: table name
 747          * @param $uniqueIndexes Array: array of indexes. Each element may be
 748          *                       either a field name or an array of field names
 749          * @param $rows Array: rows to insert to $table
 750          * @param $fname String: function name, you can use __METHOD__ here
 751          */
 752         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabaseOracle::replace' ) {
 753                 $table = $this->tableName( $table );
 754
 755                 if ( count( $rows ) == 0 ) {
 756                         return;
 757                 }
 758
 759                 # Single row case
 760                 if ( !is_array( reset( $rows ) ) ) {
 761                         $rows = array( $rows );
 762                 }
 763
 764                 $sequenceData = $this->getSequenceData( $table );
 765
 766                 foreach ( $rows as $row ) {
 767                         # Delete rows which collide
 768                         if ( $uniqueIndexes ) {
 769                                 $condsDelete = array();
 770                                 foreach ( $uniqueIndexes as $index ) {
 771                                         $condsDelete[$index] = $row[$index];
 772                                 }
 773                                 if ( count( $condsDelete ) > 0 ) {
 774                                         $this->delete( $table, $condsDelete, $fname );
 775                                 }
 776                         }
 777
 778                         if ( $sequenceData !== false && !isset( $row[$sequenceData['column']] ) ) {
 779                                 $row[$sequenceData['column']] = $this->nextSequenceValue( $sequenceData['sequence'] );
 780                         }
 781
 782                         # Now insert the row
 783                         $this->insert( $table, $row, $fname );
 784                 }
 785         }
 786
 787         # DELETE where the condition is a join
 788         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = 'DatabaseOracle::deleteJoin' ) {
 789                 if ( !$conds ) {
 790                         throw new DBUnexpectedError( $this, 'DatabaseOracle::deleteJoin() called with empty $conds' );
 791                 }
 792
 793                 $delTable = $this->tableName( $delTable );
 794                 $joinTable = $this->tableName( $joinTable );
 795                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 796                 if ( $conds != '*' ) {
 797                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 798                 }
 799                 $sql .= ')';
 800
 801                 $this->query( $sql, $fname );
 802         }
 803
 804         # Returns the size of a text field, or -1 for "unlimited"
 805         function textFieldSize( $table, $field ) {
 806                 $fieldInfoData = $this->fieldInfo( $table, $field);
 807                 if ( $fieldInfoData->type() == 'varchar' ) {
 808                         $size = $row->size - 4;
 809                 } else {
 810                         $size = $row->size;
 811                 }
 812                 return $size;
 813         }
 814
 815         function limitResult( $sql, $limit, $offset = false ) {
 816                 if ( $offset === false ) {
 817                         $offset = 0;
 818                 }
 819                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 820         }
 821
 822         function encodeBlob( $b ) {
 823                 return new Blob( $b );
 824         }
 825
 826         function decodeBlob( $b ) {
 827                 if ( $b instanceof Blob ) {
 828                         $b = $b->fetch();
 829                 }
 830                 return $b;
 831         }
 832
 833         function unionQueries( $sqls, $all ) {
 834                 $glue = ' UNION ALL ';
 835                 return 'SELECT * ' . ( $all ? '':'/* UNION_UNIQUE */ ' ) . 'FROM (' . implode( $glue, $sqls ) . ')' ;
 836         }
 837
 838         function wasDeadlock() {
 839                 return $this->lastErrno() == 'OCI-00060';
 840         }
 841
 842         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabaseOracle::duplicateTableStructure' ) {
 843                 global $wgDBprefix;
 844
 845                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 846
 847                 $newName = trim( strtoupper( $newName ), '"');
 848                 $oldName = trim( strtoupper( $oldName ), '"');
 849
 850                 $tabName = substr( $newName, strlen( $wgDBprefix ) );
 851                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 852
 853                 return $this->doQuery( 'BEGIN DUPLICATE_TABLE(\'' . $tabName . '\', \'' . $oldPrefix . '\', \'' . strtoupper( $wgDBprefix ) . '\', ' . $temporary . '); END;' );
 854         }
 855
 856         function timestamp( $ts = 0 ) {
 857                 return wfTimestamp( TS_ORACLE, $ts );
 858         }
 859
 860         /**
 861          * Return aggregated value function call
 862          */
 863         function aggregateValue ( $valuedata, $valuename = 'value' ) {
 864                 return $valuedata;
 865         }
 866
 867         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 868                 # Ignore errors during error handling to avoid infinite
 869                 # recursion
 870                 $ignore = $this->ignoreErrors( true );
 871                 ++$this->mErrorCount;
 872
 873                 if ( $ignore || $tempIgnore ) {
 874                         wfDebug( "SQL ERROR (ignored): $error\n" );
 875                         $this->ignoreErrors( $ignore );
 876                 } else {
 877                         throw new DBQueryError( $this, $error, $errno, $sql, $fname );
 878                 }
 879         }
 880
 881         /**
 882          * @return string wikitext of a link to the server software's web site
 883          */
 884         public static function getSoftwareLink() {
 885                 return '[http://www.oracle.com/ Oracle]';
 886         }
 887
 888         /**
 889          * @return string Version information from the database
 890          */
 891         function getServerVersion() {
 892                 //better version number, fallback on driver
 893                 $rset = $this->doQuery( 'SELECT version FROM product_component_version WHERE UPPER(product) LIKE \'ORACLE DATABASE%\'' );
 894                 if ( !( $row =  $rset->fetchRow() ) ) {
 895                         return oci_server_version( $this->mConn );
 896                 }
 897                 return $row['version'];
 898         }
 899
 900         /**
 901          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 902          */
 903         function tableExists( $table ) {
 904                 $SQL = "SELECT 1 FROM user_tables WHERE table_name='$table'";
 905                 $res = $this->doQuery( $SQL );
 906                 if ( $res ) {
 907                         $count = $res->numRows();
 908                         $res->free();
 909                 } else {
 910                         $count = 0;
 911                 }
 912                 return $count;
 913         }
 914
 915         /**
 916          * Function translates mysql_fetch_field() functionality on ORACLE.
 917          * Caching is present for reducing query time.
 918          * For internal calls. Use fieldInfo for normal usage.
 919          * Returns false if the field doesn't exist
 920          *
 921          * @param $table Array
 922          * @param $field String
 923          * @return ORAField
 924          */
 925         private function fieldInfoMulti( $table, $field ) {
 926                 $field = strtoupper( $field );
 927                 if ( is_array( $table ) ) {
 928                         $table = array_map( array( &$this, 'tableName' ), $table );
 929                         $tableWhere = 'IN (';
 930                         foreach( $table as &$singleTable ) {
 931                                 $singleTable = strtoupper( trim( $singleTable, '"' ) );
 932                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 933                                         return $this->mFieldInfoCache["$singleTable.$field"];
 934                                 }
 935                                 $tableWhere .= '\'' . $singleTable . '\',';
 936                         }
 937                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 938                 } else {
 939                         $table = strtoupper( trim( $this->tableName( $table ), '"' ) );
 940                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 941                                 return $this->mFieldInfoCache["$table.$field"];
 942                         }
 943                         $tableWhere = '= \''.$table.'\'';
 944                 }
 945
 946                 $fieldInfoStmt = oci_parse( $this->mConn, 'SELECT * FROM wiki_field_info_full WHERE table_name '.$tableWhere.' and column_name = \''.$field.'\'' );
 947                 if ( oci_execute( $fieldInfoStmt, OCI_DEFAULT ) === false ) {
 948                         $e = oci_error( $fieldInfoStmt );
 949                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 950                         return false;
 951                 }
 952                 $res = new ORAResult( $this, $fieldInfoStmt );
 953                 if ( $res->numRows() == 0 ) {
 954                         if ( is_array( $table ) ) {
 955                                 foreach( $table as &$singleTable ) {
 956                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 957                                 }
 958                         } else {
 959                                 $this->mFieldInfoCache["$table.$field"] = false;
 960                         }
 961                         $fieldInfoTemp = null;
 962                 } else {
 963                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 964                         $table = $fieldInfoTemp->tableName();
 965                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 966                 }
 967                 $res->free();
 968                 return $fieldInfoTemp;
 969         }
 970
 971         /**
 972          * @throws DBUnexpectedError
 973          * @param  $table
 974          * @param  $field
 975          * @return ORAField
 976          */
 977         function fieldInfo( $table, $field ) {
 978                 if ( is_array( $table ) ) {
 979                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 980                 }
 981                 return $this->fieldInfoMulti ($table, $field);
 982         }
 983
 984         function begin( $fname = '' ) {
 985                 $this->mTrxLevel = 1;
 986         }
 987
 988         function commit( $fname = '' ) {
 989                 oci_commit( $this->mConn );
 990                 $this->mTrxLevel = 0;
 991         }
 992
 993         /* Not even sure why this is used in the main codebase... */
 994         function limitResultForUpdate( $sql, $num ) {
 995                 return $sql;
 996         }
 997
 998         /* defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}'; */
 999         function sourceStream( $fp, $lineCallback = false, $resultCallback = false, $fname = 'DatabaseOracle::sourceStream' ) {
1000                 $cmd = '';
1001                 $done = false;
1002                 $dollarquote = false;
1003
1004                 $replacements = array();
1005
1006                 while ( ! feof( $fp ) ) {
1007                         if ( $lineCallback ) {
1008                                 call_user_func( $lineCallback );
1009                         }
1010                         $line = trim( fgets( $fp, 1024 ) );
1011                         $sl = strlen( $line ) - 1;
1012
1013                         if ( $sl < 0 ) {
1014                                 continue;
1015                         }
1016                         if ( '-' == $line { 0 } && '-' == $line { 1 } ) {
1017                                 continue;
1018                         }
1019
1020                         // Allow dollar quoting for function declarations
1021                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
1022                                 if ( $dollarquote ) {
1023                                         $dollarquote = false;
1024                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
1025                                         $done = true;
1026                                 } else {
1027                                         $dollarquote = true;
1028                                 }
1029                         } elseif ( !$dollarquote ) {
1030                                 if ( ';' == $line { $sl } && ( $sl < 2 || ';' != $line { $sl - 1 } ) ) {
1031                                         $done = true;
1032                                         $line = substr( $line, 0, $sl );
1033                                 }
1034                         }
1035
1036                         if ( $cmd != '' ) {
1037                                 $cmd .= ' ';
1038                         }
1039                         $cmd .= "$line\n";
1040
1041                         if ( $done ) {
1042                                 $cmd = str_replace( ';;', ";", $cmd );
1043                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1044                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1045                                                 $replacements[$defines[2]] = $defines[1];
1046                                         }
1047                                 } else {
1048                                         foreach ( $replacements as $mwVar => $scVar ) {
1049                                                 $cmd = str_replace( '&' . $scVar . '.', '{$' . $mwVar . '}', $cmd );
1050                                         }
1051
1052                                         $cmd = $this->replaceVars( $cmd );
1053                                         $res = $this->doQuery( $cmd );
1054                                         if ( $resultCallback ) {
1055                                                 call_user_func( $resultCallback, $res, $this );
1056                                         }
1057
1058                                         if ( false === $res ) {
1059                                                 $err = $this->lastError();
1060                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1061                                         }
1062                                 }
1063
1064                                 $cmd = '';
1065                                 $done = false;
1066                         }
1067                 }
1068                 return true;
1069         }
1070
1071         function selectDB( $db ) {
1072                 if ( $db == null || $db == $this->mUser ) { return true; }
1073                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper($db);
1074                 $stmt = oci_parse( $this->mConn, $sql );
1075                 if ( !oci_execute( $stmt ) ) {
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         function selectRow( $table, $vars, $conds, $fname = 'DatabaseOracle::selectRow', $options = array(), $join_conds = array() ) {
1098                 global $wgContLang;
1099
1100                 $conds2 = array();
1101                 $conds = ( $conds != null && !is_array( $conds ) ) ? array( $conds ) : $conds;
1102                 foreach ( $conds as $col => $val ) {
1103                         $col_info = $this->fieldInfoMulti( $table, $col );
1104                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1105                         if ( $col_type == 'CLOB' ) {
1106                                 $conds2['TO_CHAR(' . $col . ')'] = $wgContLang->checkTitleEncoding( $val );
1107                         } elseif ( $col_type == 'VARCHAR2' && !mb_check_encoding( $val ) ) {
1108                                 $conds2[$col] = $wgContLang->checkTitleEncoding( $val );
1109                         } else {
1110                                 $conds2[$col] = $val;
1111                         }
1112                 }
1113
1114                 return parent::selectRow( $table, $vars, $conds2, $fname, $options, $join_conds );
1115         }
1116
1117         /**
1118          * Returns an optional USE INDEX clause to go after the table, and a
1119          * string to go at the end of the query
1120          *
1121          * @private
1122          *
1123          * @param $options Array: an associative array of options to be turned into
1124          *              an SQL query, valid keys are listed in the function.
1125          * @return array
1126          */
1127         function makeSelectOptions( $options ) {
1128                 $preLimitTail = $postLimitTail = '';
1129                 $startOpts = '';
1130
1131                 $noKeyOptions = array();
1132                 foreach ( $options as $key => $option ) {
1133                         if ( is_numeric( $key ) ) {
1134                                 $noKeyOptions[$option] = true;
1135                         }
1136                 }
1137
1138                 if ( isset( $options['GROUP BY'] ) ) {
1139                         $preLimitTail .= " GROUP BY {$options['GROUP BY']}";
1140                 }
1141                 if ( isset( $options['ORDER BY'] ) ) {
1142                         $preLimitTail .= " ORDER BY {$options['ORDER BY']}";
1143                 }
1144
1145                 # if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $tailOpts .= ' FOR UPDATE';
1146                 # if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $tailOpts .= ' LOCK IN SHARE MODE';
1147                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1148                         $startOpts .= 'DISTINCT';
1149                 }
1150
1151                 if ( isset( $options['USE INDEX'] ) && ! is_array( $options['USE INDEX'] ) ) {
1152                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1153                 } else {
1154                         $useIndex = '';
1155                 }
1156
1157                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1158         }
1159
1160         public function delete( $table, $conds, $fname = 'DatabaseOracle::delete' ) {
1161                 global $wgContLang;
1162
1163                 if ( $wgContLang != null && $conds != '*' ) {
1164                         $conds2 = array();
1165                         $conds = ( $conds != null && !is_array( $conds ) ) ? array( $conds ) : $conds;
1166                         foreach ( $conds as $col => $val ) {
1167                                 $col_info = $this->fieldInfoMulti( $table, $col );
1168                                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1169                                 if ( $col_type == 'CLOB' ) {
1170                                         $conds2['TO_CHAR(' . $col . ')'] = $wgContLang->checkTitleEncoding( $val );
1171                                 } else {
1172                                         if ( is_array( $val ) ) {
1173                                                 $conds2[$col] = $val;
1174                                                 foreach ( $conds2[$col] as &$val2 ) {
1175                                                         $val2 = $wgContLang->checkTitleEncoding( $val2 );
1176                                                 }
1177                                         } else {
1178                                                 $conds2[$col] = $wgContLang->checkTitleEncoding( $val );
1179                                         }
1180                                 }
1181                         }
1182
1183                         return parent::delete( $table, $conds2, $fname );
1184                 } else {
1185                         return parent::delete( $table, $conds, $fname );
1186                 }
1187         }
1188
1189         function update( $table, $values, $conds, $fname = 'DatabaseOracle::update', $options = array() ) {
1190                 global $wgContLang;
1191
1192                 $table = $this->tableName( $table );
1193                 $opts = $this->makeUpdateOptions( $options );
1194                 $sql = "UPDATE $opts $table SET ";
1195
1196                 $first = true;
1197                 foreach ( $values as $col => &$val ) {
1198                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1199
1200                         if ( !$first ) {
1201                                 $sqlSet = ', ' . $sqlSet;
1202                         } else {
1203                                 $first = false;
1204                         }
1205                         $sql .= $sqlSet;
1206                 }
1207
1208                 if ( $conds != '*' ) {
1209                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1210                 }
1211
1212                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
1213                         $e = oci_error( $this->mConn );
1214                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1215                         return false;
1216                 }
1217                 foreach ( $values as $col => &$val ) {
1218                         $col_info = $this->fieldInfoMulti( $table, $col );
1219                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1220
1221                         if ( $val === null ) {
1222                                 // do nothing ... null was inserted in statement creation
1223                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1224                                 if ( is_object( $val ) ) {
1225                                         $val = $val->getData();
1226                                 }
1227
1228                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1229                                         $val = '31-12-2030 12:00:00.000000';
1230                                 }
1231
1232                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1233                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1234                                         $e = oci_error( $stmt );
1235                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1236                                         return false;
1237                                 }
1238                         } else {
1239                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
1240                                         $e = oci_error( $stmt );
1241                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1242                                 }
1243
1244                                 if ( $col_type == 'BLOB' ) {
1245                                         $lob[$col]->writeTemporary( $val );
1246                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, SQLT_BLOB );
1247                                 } else {
1248                                         $lob[$col]->writeTemporary( $val );
1249                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_CLOB );
1250                                 }
1251                         }
1252                 }
1253
1254                 wfSuppressWarnings();
1255
1256                 if ( oci_execute( $stmt, OCI_DEFAULT ) === false ) {
1257                         $e = oci_error( $stmt );
1258                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
1259                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1260                                 return false;
1261                         } else {
1262                                 $this->mAffectedRows = oci_num_rows( $stmt );
1263                         }
1264                 } else {
1265                         $this->mAffectedRows = oci_num_rows( $stmt );
1266                 }
1267
1268                 wfRestoreWarnings();
1269
1270                 if ( isset( $lob ) ) {
1271                         foreach ( $lob as $lob_v ) {
1272                                 $lob_v->free();
1273                         }
1274                 }
1275
1276                 if ( !$this->mTrxLevel ) {
1277                         oci_commit( $this->mConn );
1278                 }
1279
1280                 oci_free_statement( $stmt );
1281         }
1282
1283         function bitNot( $field ) {
1284                 // expecting bit-fields smaller than 4bytes
1285                 return 'BITNOT(' . $field . ')';
1286         }
1287
1288         function bitAnd( $fieldLeft, $fieldRight ) {
1289                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1290         }
1291
1292         function bitOr( $fieldLeft, $fieldRight ) {
1293                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1294         }
1295
1296         function setFakeMaster( $enabled = true ) { }
1297
1298         function getDBname() {
1299                 return $this->mDBname;
1300         }
1301
1302         function getServer() {
1303                 return $this->mServer;
1304         }
1305
1306         public function replaceVars( $ins ) {
1307                 $varnames = array( 'wgDBprefix' );
1308                 if ( $this->mFlags & DBO_SYSDBA ) {
1309                         $varnames[] = '_OracleDefTS';
1310                         $varnames[] = '_OracleTempTS';
1311                 }
1312
1313                 $ins = $this->replaceGlobalVars( $ins, $varnames );
1314
1315                 return parent::replaceVars( $ins );
1316         }
1317
1318         public function getSearchEngine() {
1319                 return 'SearchOracle';
1320         }
1321 } // end DatabaseOracle class