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  * The oci8 extension is fairly weak and doesn't support oci_num_rows, among
  11  * other things.  We use a wrapper class to handle that and other
  12  * Oracle-specific bits, like converting column names back to lowercase.
  13  * @ingroup Database
  14  */
  15 class ORAResult {
  16         private $rows;
  17         private $cursor;
  18         private $nrows;
  19
  20         private $columns = array();
  21
  22         private function array_unique_md( $array_in ) {
  23                 $array_out = array();
  24                 $array_hashes = array();
  25
  26                 foreach ( $array_in as $item ) {
  27                         $hash = md5( serialize( $item ) );
  28                         if ( !isset( $array_hashes[$hash] ) ) {
  29                                 $array_hashes[$hash] = $hash;
  30                                 $array_out[] = $item;
  31                         }
  32                 }
  33
  34                 return $array_out;
  35         }
  36
  37         /**
  38          * @param $db DatabaseBase
  39          * @param $stmt
  40          * @param bool $unique
  41          */
  42         function __construct( &$db, $stmt, $unique = false ) {
  43                 $this->db =& $db;
  44
  45                 if ( ( $this->nrows = oci_fetch_all( $stmt, $this->rows, 0, - 1, OCI_FETCHSTATEMENT_BY_ROW | OCI_NUM ) ) === false ) {
  46                         $e = oci_error( $stmt );
  47                         $db->reportQueryError( $e['message'], $e['code'], '', __METHOD__ );
  48                         $this->free();
  49                         return;
  50                 }
  51
  52                 if ( $unique ) {
  53                         $this->rows = $this->array_unique_md( $this->rows );
  54                         $this->nrows = count( $this->rows );
  55                 }
  56
  57                 if ($this->nrows > 0) {
  58                         foreach ( $this->rows[0] as $k => $v ) {
  59                                 $this->columns[$k] = strtolower( oci_field_name( $stmt, $k + 1 ) );
  60                         }
  61                 }
  62
  63                 $this->cursor = 0;
  64                 oci_free_statement( $stmt );
  65         }
  66
  67         public function free() {
  68                 unset($this->db);
  69         }
  70
  71         public function seek( $row ) {
  72                 $this->cursor = min( $row, $this->nrows );
  73         }
  74
  75         public function numRows() {
  76                 return $this->nrows;
  77         }
  78
  79         public function numFields() {
  80                 return count($this->columns);
  81         }
  82
  83         public function fetchObject() {
  84                 if ( $this->cursor >= $this->nrows ) {
  85                         return false;
  86                 }
  87                 $row = $this->rows[$this->cursor++];
  88                 $ret = new stdClass();
  89                 foreach ( $row as $k => $v ) {
  90                         $lc = $this->columns[$k];
  91                         $ret->$lc = $v;
  92                 }
  93
  94                 return $ret;
  95         }
  96
  97         public function fetchRow() {
  98                 if ( $this->cursor >= $this->nrows ) {
  99                         return false;
 100                 }
 101
 102                 $row = $this->rows[$this->cursor++];
 103                 $ret = array();
 104                 foreach ( $row as $k => $v ) {
 105                         $lc = $this->columns[$k];
 106                         $ret[$lc] = $v;
 107                         $ret[$k] = $v;
 108                 }
 109                 return $ret;
 110         }
 111 }
 112
 113 /**
 114  * Utility class.
 115  * @ingroup Database
 116  */
 117 class ORAField implements Field {
 118         private $name, $tablename, $default, $max_length, $nullable,
 119                 $is_pk, $is_unique, $is_multiple, $is_key, $type;
 120
 121         function __construct( $info ) {
 122                 $this->name = $info['column_name'];
 123                 $this->tablename = $info['table_name'];
 124                 $this->default = $info['data_default'];
 125                 $this->max_length = $info['data_length'];
 126                 $this->nullable = $info['not_null'];
 127                 $this->is_pk = isset( $info['prim'] ) && $info['prim'] == 1 ? 1 : 0;
 128                 $this->is_unique = isset( $info['uniq'] ) && $info['uniq'] == 1 ? 1 : 0;
 129                 $this->is_multiple = isset( $info['nonuniq'] ) && $info['nonuniq'] == 1 ? 1 : 0;
 130                 $this->is_key = ( $this->is_pk || $this->is_unique || $this->is_multiple );
 131                 $this->type = $info['data_type'];
 132         }
 133
 134         function name() {
 135                 return $this->name;
 136         }
 137
 138         function tableName() {
 139                 return $this->tablename;
 140         }
 141
 142         function defaultValue() {
 143                 return $this->default;
 144         }
 145
 146         function maxLength() {
 147                 return $this->max_length;
 148         }
 149
 150         function isNullable() {
 151                 return $this->nullable;
 152         }
 153
 154         function isKey() {
 155                 return $this->is_key;
 156         }
 157
 158         function isMultipleKey() {
 159                 return $this->is_multiple;
 160         }
 161
 162         function type() {
 163                 return $this->type;
 164         }
 165 }
 166
 167 /**
 168  * @ingroup Database
 169  */
 170 class DatabaseOracle extends DatabaseBase {
 171         var $mInsertId = null;
 172         var $mLastResult = null;
 173         var $lastResult = null;
 174         var $cursor = 0;
 175         var $mAffectedRows;
 176
 177         var $ignore_DUP_VAL_ON_INDEX = false;
 178         var $sequenceData = null;
 179
 180         var $defaultCharset = 'AL32UTF8';
 181
 182         var $mFieldInfoCache = array();
 183
 184         function __construct( $server = false, $user = false, $password = false, $dbName = false,
 185                 $flags = 0, $tablePrefix = 'get from global' )
 186         {
 187                 global $wgDBprefix;
 188                 $tablePrefix = $tablePrefix == 'get from global' ? strtoupper( $wgDBprefix ) : strtoupper( $tablePrefix );
 189                 parent::__construct( $server, $user, $password, $dbName, $flags, $tablePrefix );
 190                 wfRunHooks( 'DatabaseOraclePostInit', array( $this ) );
 191         }
 192
 193         function __destruct() {
 194                 if ($this->mOpened) {
 195                         wfSuppressWarnings();
 196                         $this->close();
 197                         wfRestoreWarnings();
 198                 }
 199         }
 200
 201         function getType() {
 202                 return 'oracle';
 203         }
 204
 205         function cascadingDeletes() {
 206                 return true;
 207         }
 208         function cleanupTriggers() {
 209                 return true;
 210         }
 211         function strictIPs() {
 212                 return true;
 213         }
 214         function realTimestamps() {
 215                 return true;
 216         }
 217         function implicitGroupby() {
 218                 return false;
 219         }
 220         function implicitOrderby() {
 221                 return false;
 222         }
 223         function searchableIPs() {
 224                 return true;
 225         }
 226
 227         /**
 228          * Usually aborts on failure
 229          */
 230         function open( $server, $user, $password, $dbName ) {
 231                 if ( !function_exists( 'oci_connect' ) ) {
 232                         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" );
 233                 }
 234
 235                 $this->close();
 236                 $this->mUser = $user;
 237                 $this->mPassword = $password;
 238                 // changed internal variables functions
 239                 // mServer now holds the TNS endpoint
 240                 // mDBname is schema name if different from username
 241                 if ( !$server ) {
 242                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 243                         $this->mServer = $dbName;
 244                         $this->mDBname = $user;
 245                 } else {
 246                         $this->mServer = $server;
 247                         if ( !$dbName ) {
 248                                 $this->mDBname = $user;
 249                         } else {
 250                                 $this->mDBname = $dbName;
 251                         }
 252                 }
 253
 254                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 255                         return;
 256                 }
 257
 258                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 259                 wfSuppressWarnings();
 260                 if ( $this->mFlags & DBO_DEFAULT ) {
 261                         $this->mConn = oci_new_connect( $this->mUser, $this->mPassword, $this->mServer, $this->defaultCharset, $session_mode );
 262                 } else {
 263                         $this->mConn = oci_connect( $this->mUser, $this->mPassword, $this->mServer, $this->defaultCharset, $session_mode );
 264                 }
 265                 wfRestoreWarnings();
 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                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 282                 return $this->mConn;
 283         }
 284
 285         /**
 286          * Closes a database connection, if it is open
 287          * Returns success, true if already closed
 288          */
 289         function close() {
 290                 $this->mOpened = false;
 291                 if ( $this->mConn ) {
 292                         if ( $this->mTrxLevel ) {
 293                                 $this->commit();
 294                         }
 295                         return oci_close( $this->mConn );
 296                 } else {
 297                         return true;
 298                 }
 299         }
 300
 301         function execFlags() {
 302                 return $this->mTrxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 303         }
 304
 305         protected function doQuery( $sql ) {
 306                 wfDebug( "SQL: [$sql]\n" );
 307                 if ( !mb_check_encoding( $sql ) ) {
 308                         throw new MWException( "SQL encoding is invalid\n$sql" );
 309                 }
 310
 311                 // handle some oracle specifics
 312                 // remove AS column/table/subquery namings
 313                 if( !$this->getFlag( DBO_DDLMODE ) ) {
 314                         $sql = preg_replace( '/ as /i', ' ', $sql );
 315                 }
 316
 317                 // Oracle has issues with UNION clause if the statement includes LOB fields
 318                 // So we do a UNION ALL and then filter the results array with array_unique
 319                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 320                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 321                 // you have to select data from plan table after explain
 322                 $explain_id = date( 'dmYHis' );
 323
 324                 $sql = preg_replace( '/^EXPLAIN /', 'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR', $sql, 1, $explain_count );
 325
 326                 wfSuppressWarnings();
 327
 328                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 329                         $e = oci_error( $this->mConn );
 330                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 331                         return false;
 332                 }
 333
 334                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 335                         $e = oci_error( $stmt );
 336                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 337                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 338                                 return false;
 339                         }
 340                 }
 341
 342                 wfRestoreWarnings();
 343
 344                 if ( $explain_count > 0 ) {
 345                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table WHERE statement_id = \'' . $explain_id . '\'' );
 346                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 347                         return new ORAResult( $this, $stmt, $union_unique );
 348                 } else {
 349                         $this->mAffectedRows = oci_num_rows( $stmt );
 350                         return true;
 351                 }
 352         }
 353
 354         function queryIgnore( $sql, $fname = '' ) {
 355                 return $this->query( $sql, $fname, true );
 356         }
 357
 358         function freeResult( $res ) {
 359                 if ( $res instanceof ResultWrapper ) {
 360                         $res = $res->result;
 361                 }
 362
 363                 $res->free();
 364         }
 365
 366         function fetchObject( $res ) {
 367                 if ( $res instanceof ResultWrapper ) {
 368                         $res = $res->result;
 369                 }
 370
 371                 return $res->fetchObject();
 372         }
 373
 374         function fetchRow( $res ) {
 375                 if ( $res instanceof ResultWrapper ) {
 376                         $res = $res->result;
 377                 }
 378
 379                 return $res->fetchRow();
 380         }
 381
 382         function numRows( $res ) {
 383                 if ( $res instanceof ResultWrapper ) {
 384                         $res = $res->result;
 385                 }
 386
 387                 return $res->numRows();
 388         }
 389
 390         function numFields( $res ) {
 391                 if ( $res instanceof ResultWrapper ) {
 392                         $res = $res->result;
 393                 }
 394
 395                 return $res->numFields();
 396         }
 397
 398         function fieldName( $stmt, $n ) {
 399                 return oci_field_name( $stmt, $n );
 400         }
 401
 402         /**
 403          * This must be called after nextSequenceVal
 404          */
 405         function insertId() {
 406                 return $this->mInsertId;
 407         }
 408
 409         function dataSeek( $res, $row ) {
 410                 if ( $res instanceof ORAResult ) {
 411                         $res->seek( $row );
 412                 } else {
 413                         $res->result->seek( $row );
 414                 }
 415         }
 416
 417         function lastError() {
 418                 if ( $this->mConn === false ) {
 419                         $e = oci_error();
 420                 } else {
 421                         $e = oci_error( $this->mConn );
 422                 }
 423                 return $e['message'];
 424         }
 425
 426         function lastErrno() {
 427                 if ( $this->mConn === false ) {
 428                         $e = oci_error();
 429                 } else {
 430                         $e = oci_error( $this->mConn );
 431                 }
 432                 return $e['code'];
 433         }
 434
 435         function affectedRows() {
 436                 return $this->mAffectedRows;
 437         }
 438
 439         /**
 440          * Returns information about an index
 441          * If errors are explicitly ignored, returns NULL on failure
 442          */
 443         function indexInfo( $table, $index, $fname = 'DatabaseOracle::indexExists' ) {
 444                 return false;
 445         }
 446
 447         function indexUnique( $table, $index, $fname = 'DatabaseOracle::indexUnique' ) {
 448                 return false;
 449         }
 450
 451         function insert( $table, $a, $fname = 'DatabaseOracle::insert', $options = array() ) {
 452                 if ( !count( $a ) ) {
 453                         return true;
 454                 }
 455
 456                 if ( !is_array( $options ) ) {
 457                         $options = array( $options );
 458                 }
 459
 460                 if ( in_array( 'IGNORE', $options ) ) {
 461                         $this->ignore_DUP_VAL_ON_INDEX = true;
 462                 }
 463
 464                 if ( !is_array( reset( $a ) ) ) {
 465                         $a = array( $a );
 466                 }
 467
 468                 foreach ( $a as &$row ) {
 469                         $this->insertOneRow( $table, $row, $fname );
 470                 }
 471                 $retVal = true;
 472
 473                 if ( in_array( 'IGNORE', $options ) ) {
 474                         $this->ignore_DUP_VAL_ON_INDEX = false;
 475                 }
 476
 477                 return $retVal;
 478         }
 479
 480         private function fieldBindStatement ( $table, $col, &$val, $includeCol = false ) {
 481                 $col_info = $this->fieldInfoMulti( $table, $col );
 482                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 483
 484                 $bind = '';
 485                 if ( is_numeric( $col ) ) {
 486                         $bind = $val;
 487                         $val = null;
 488                         return $bind;
 489                 } elseif ( $includeCol ) {
 490                         $bind = "$col = ";
 491                 }
 492
 493                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 494                         $val = null;
 495                 }
 496
 497                 if ( $val === 'NULL' ) {
 498                         $val = null;
 499                 }
 500
 501                 if ( $val === null ) {
 502                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 503                                 $bind .= 'DEFAULT';
 504                         } else {
 505                                 $bind .= 'NULL';
 506                         }
 507                 } else {
 508                         $bind .= ':' . $col;
 509                 }
 510
 511                 return $bind;
 512         }
 513
 514         private function insertOneRow( $table, $row, $fname ) {
 515                 global $wgContLang;
 516
 517                 $table = $this->tableName( $table );
 518                 // "INSERT INTO tables (a, b, c)"
 519                 $sql = "INSERT INTO " . $table . " (" . join( ',', array_keys( $row ) ) . ')';
 520                 $sql .= " VALUES (";
 521
 522                 // for each value, append ":key"
 523                 $first = true;
 524                 foreach ( $row as $col => &$val ) {
 525                         if ( !$first ) {
 526                                 $sql .= ', ';
 527                         } else {
 528                                 $first = false;
 529                         }
 530
 531                         $sql .= $this->fieldBindStatement( $table, $col, $val );
 532                 }
 533                 $sql .= ')';
 534
 535                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 536                         $e = oci_error( $this->mConn );
 537                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 538                         return false;
 539                 }
 540                 foreach ( $row as $col => &$val ) {
 541                         $col_info = $this->fieldInfoMulti( $table, $col );
 542                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 543
 544                         if ( $val === null ) {
 545                                 // do nothing ... null was inserted in statement creation
 546                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 547                                 if ( is_object( $val ) ) {
 548                                         $val = $val->fetch();
 549                                 }
 550
 551                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 552                                         $val = '31-12-2030 12:00:00.000000';
 553                                 }
 554
 555                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 556                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 557                                         $e = oci_error( $stmt );
 558                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 559                                         return false;
 560                                 }
 561                         } else {
 562                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
 563                                         $e = oci_error( $stmt );
 564                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 565                                 }
 566
 567                                 if ( is_object( $val ) ) {
 568                                         $val = $val->fetch();
 569                                 }
 570
 571                                 if ( $col_type == 'BLOB' ) {
 572                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 573                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_BLOB );
 574                                 } else {
 575                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 576                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_CLOB );
 577                                 }
 578                         }
 579                 }
 580
 581                 wfSuppressWarnings();
 582
 583                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 584                         $e = oci_error( $stmt );
 585                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 586                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 587                                 return false;
 588                         } else {
 589                                 $this->mAffectedRows = oci_num_rows( $stmt );
 590                         }
 591                 } else {
 592                         $this->mAffectedRows = oci_num_rows( $stmt );
 593                 }
 594
 595                 wfRestoreWarnings();
 596
 597                 if ( isset( $lob ) ) {
 598                         foreach ( $lob as $lob_v ) {
 599                                 $lob_v->free();
 600                         }
 601                 }
 602
 603                 if ( !$this->mTrxLevel ) {
 604                         oci_commit( $this->mConn );
 605                 }
 606
 607                 oci_free_statement( $stmt );
 608         }
 609
 610         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabaseOracle::insertSelect',
 611                 $insertOptions = array(), $selectOptions = array() )
 612         {
 613                 $destTable = $this->tableName( $destTable );
 614                 if ( !is_array( $selectOptions ) ) {
 615                         $selectOptions = array( $selectOptions );
 616                 }
 617                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 618                 if ( is_array( $srcTable ) ) {
 619                         $srcTable =  implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 620                 } else {
 621                         $srcTable = $this->tableName( $srcTable );
 622                 }
 623
 624                 if ( ( $sequenceData = $this->getSequenceData( $destTable ) ) !== false &&
 625                                 !isset( $varMap[$sequenceData['column']] ) )
 626                 {
 627                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 628                 }
 629
 630                 // count-alias subselect fields to avoid abigious definition errors
 631                 $i = 0;
 632                 foreach ( $varMap as &$val ) {
 633                         $val = $val . ' field' . ( $i++ );
 634                 }
 635
 636                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 637                         " SELECT $startOpts " . implode( ',', $varMap ) .
 638                         " FROM $srcTable $useIndex ";
 639                 if ( $conds != '*' ) {
 640                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 641                 }
 642                 $sql .= " $tailOpts";
 643
 644                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 645                         $this->ignore_DUP_VAL_ON_INDEX = true;
 646                 }
 647
 648                 $retval = $this->query( $sql, $fname );
 649
 650                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 651                         $this->ignore_DUP_VAL_ON_INDEX = false;
 652                 }
 653
 654                 return $retval;
 655         }
 656
 657         function tableName( $name, $quoted = true ) {
 658                 /*
 659                 Replace reserved words with better ones
 660                 Using uppercase because that's the only way Oracle can handle
 661                 quoted tablenames
 662                 */
 663                 switch( $name ) {
 664                         case 'user':
 665                                 $name = 'MWUSER';
 666                                 break;
 667                         case 'text':
 668                                 $name = 'PAGECONTENT';
 669                                 break;
 670                 }
 671
 672                 return parent::tableName( strtoupper( $name ), $quoted );
 673         }
 674
 675         function tableNameInternal( $name ) {
 676                 $name = $this->tableName( $name );
 677                 return preg_replace( '/.*\.(.*)/', '$1', $name);
 678         }
 679         /**
 680          * Return the next in a sequence, save the value for retrieval via insertId()
 681          */
 682         function nextSequenceValue( $seqName ) {
 683                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 684                 $row = $this->fetchRow( $res );
 685                 $this->mInsertId = $row[0];
 686                 return $this->mInsertId;
 687         }
 688
 689         /**
 690          * Return sequence_name if table has a sequence
 691          */
 692         private function getSequenceData( $table ) {
 693                 if ( $this->sequenceData == null ) {
 694                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 695                                    lower(atc.table_name),
 696                                    lower(atc.column_name)
 697                           FROM all_sequences asq, all_tab_columns atc
 698                          WHERE decode(atc.table_name, '{$this->mTablePrefix}MWUSER', '{$this->mTablePrefix}USER', atc.table_name) || '_' ||
 699                                    atc.column_name || '_SEQ' = '{$this->mTablePrefix}' || asq.sequence_name
 700                            AND asq.sequence_owner = '{$this->mDBname}'
 701                            AND atc.owner = '{$this->mDBname}'" );
 702
 703                         while ( ( $row = $result->fetchRow() ) !== false ) {
 704                                 $this->sequenceData[$this->tableName( $row[1] )] = array(
 705                                         'sequence' => $row[0],
 706                                         'column' => $row[2]
 707                                 );
 708                         }
 709                 }
 710                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 711                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 712         }
 713
 714         # Returns the size of a text field, or -1 for "unlimited"
 715         function textFieldSize( $table, $field ) {
 716                 $fieldInfoData = $this->fieldInfo( $table, $field );
 717                 return $fieldInfoData->maxLength();
 718         }
 719
 720         function limitResult( $sql, $limit, $offset = false ) {
 721                 if ( $offset === false ) {
 722                         $offset = 0;
 723                 }
 724                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 725         }
 726
 727         function encodeBlob( $b ) {
 728                 return new Blob( $b );
 729         }
 730
 731         function decodeBlob( $b ) {
 732                 if ( $b instanceof Blob ) {
 733                         $b = $b->fetch();
 734                 }
 735                 return $b;
 736         }
 737
 738         function unionQueries( $sqls, $all ) {
 739                 $glue = ' UNION ALL ';
 740                 return 'SELECT * ' . ( $all ? '':'/* UNION_UNIQUE */ ' ) . 'FROM (' . implode( $glue, $sqls ) . ')' ;
 741         }
 742
 743         function wasDeadlock() {
 744                 return $this->lastErrno() == 'OCI-00060';
 745         }
 746
 747         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabaseOracle::duplicateTableStructure' ) {
 748                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 749
 750                 $newName = strtoupper( $newName );
 751                 $oldName = strtoupper( $oldName );
 752
 753                 $tabName = substr( $newName, strlen( $this->mTablePrefix ) );
 754                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 755                 $newPrefix = strtoupper( $this->mTablePrefix );
 756
 757                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', '$oldPrefix', '$newPrefix', $temporary ); END;" );
 758         }
 759
 760         function listTables( $prefix = null, $fname = 'DatabaseOracle::listTables' ) {
 761                 $listWhere = '';
 762                 if (!empty($prefix)) {
 763                         $listWhere = ' AND table_name LIKE \''.strtoupper($prefix).'%\'';
 764                 }
 765
 766                 $owner = strtoupper( $this->mDBname );
 767                 $result = $this->doQuery( "SELECT table_name FROM all_tables WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 768
 769                 // dirty code ... i know
 770                 $endArray = array();
 771                 $endArray[] = $prefix.'MWUSER';
 772                 $endArray[] = $prefix.'PAGE';
 773                 $endArray[] = $prefix.'IMAGE';
 774                 $fixedOrderTabs = $endArray;
 775                 while (($row = $result->fetchRow()) !== false) {
 776                         if (!in_array($row['table_name'], $fixedOrderTabs))
 777                                 $endArray[] = $row['table_name'];
 778                 }
 779
 780                 return $endArray;
 781         }
 782
 783         public function dropTable( $tableName, $fName = 'DatabaseOracle::dropTable' ) {
 784                 $tableName = $this->tableName($tableName);
 785                 if( !$this->tableExists( $tableName ) ) {
 786                         return false;
 787                 }
 788
 789                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 790         }
 791
 792         function timestamp( $ts = 0 ) {
 793                 return wfTimestamp( TS_ORACLE, $ts );
 794         }
 795
 796         /**
 797          * Return aggregated value function call
 798          */
 799         function aggregateValue ( $valuedata, $valuename = 'value' ) {
 800                 return $valuedata;
 801         }
 802
 803         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 804                 # Ignore errors during error handling to avoid infinite
 805                 # recursion
 806                 $ignore = $this->ignoreErrors( true );
 807                 ++$this->mErrorCount;
 808
 809                 if ( $ignore || $tempIgnore ) {
 810                         wfDebug( "SQL ERROR (ignored): $error\n" );
 811                         $this->ignoreErrors( $ignore );
 812                 } else {
 813                         throw new DBQueryError( $this, $error, $errno, $sql, $fname );
 814                 }
 815         }
 816
 817         /**
 818          * @return string wikitext of a link to the server software's web site
 819          */
 820         public static function getSoftwareLink() {
 821                 return '[http://www.oracle.com/ Oracle]';
 822         }
 823
 824         /**
 825          * @return string Version information from the database
 826          */
 827         function getServerVersion() {
 828                 //better version number, fallback on driver
 829                 $rset = $this->doQuery( 'SELECT version FROM product_component_version WHERE UPPER(product) LIKE \'ORACLE DATABASE%\'' );
 830                 if ( !( $row =  $rset->fetchRow() ) ) {
 831                         return oci_server_version( $this->mConn );
 832                 }
 833                 return $row['version'];
 834         }
 835
 836         /**
 837          * Query whether a given index exists
 838          */
 839         function indexExists( $table, $index, $fname = 'DatabaseOracle::indexExists' ) {
 840                 $table = $this->tableName( $table );
 841                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 842                 $index = strtoupper( $index );
 843                 $owner = strtoupper( $this->mDBname );
 844                 $SQL = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 845                 $res = $this->doQuery( $SQL );
 846                 if ( $res ) {
 847                         $count = $res->numRows();
 848                         $res->free();
 849                 } else {
 850                         $count = 0;
 851                 }
 852                 return $count != 0;
 853         }
 854
 855         /**
 856          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 857          */
 858         function tableExists( $table ) {
 859                 $table = $this->tableName( $table );
 860                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 861                 $owner = $this->addQuotes( strtoupper( $this->mDBname ) );
 862                 $SQL = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 863                 $res = $this->doQuery( $SQL );
 864                 if ( $res ) {
 865                         $count = $res->numRows();
 866                         $res->free();
 867                 } else {
 868                         $count = 0;
 869                 }
 870                 return $count;
 871         }
 872
 873         /**
 874          * Function translates mysql_fetch_field() functionality on ORACLE.
 875          * Caching is present for reducing query time.
 876          * For internal calls. Use fieldInfo for normal usage.
 877          * Returns false if the field doesn't exist
 878          *
 879          * @param $table Array
 880          * @param $field String
 881          * @return ORAField|ORAResult
 882          */
 883         private function fieldInfoMulti( $table, $field ) {
 884                 $field = strtoupper( $field );
 885                 if ( is_array( $table ) ) {
 886                         $table = array_map( array( &$this, 'tableNameInternal' ), $table );
 887                         $tableWhere = 'IN (';
 888                         foreach( $table as &$singleTable ) {
 889                                 $singleTable = $this->removeIdentifierQuotes($singleTable);
 890                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 891                                         return $this->mFieldInfoCache["$singleTable.$field"];
 892                                 }
 893                                 $tableWhere .= '\'' . $singleTable . '\',';
 894                         }
 895                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 896                 } else {
 897                         $table = $this->removeIdentifierQuotes(  $this->tableNameInternal( $table ) );
 898                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 899                                 return $this->mFieldInfoCache["$table.$field"];
 900                         }
 901                         $tableWhere = '= \''.$table.'\'';
 902                 }
 903
 904                 $fieldInfoStmt = oci_parse( $this->mConn, 'SELECT * FROM wiki_field_info_full WHERE table_name '.$tableWhere.' and column_name = \''.$field.'\'' );
 905                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 906                         $e = oci_error( $fieldInfoStmt );
 907                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 908                         return false;
 909                 }
 910                 $res = new ORAResult( $this, $fieldInfoStmt );
 911                 if ( $res->numRows() == 0 ) {
 912                         if ( is_array( $table ) ) {
 913                                 foreach( $table as &$singleTable ) {
 914                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 915                                 }
 916                         } else {
 917                                 $this->mFieldInfoCache["$table.$field"] = false;
 918                         }
 919                         $fieldInfoTemp = null;
 920                 } else {
 921                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 922                         $table = $fieldInfoTemp->tableName();
 923                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 924                 }
 925                 $res->free();
 926                 return $fieldInfoTemp;
 927         }
 928
 929         /**
 930          * @throws DBUnexpectedError
 931          * @param  $table
 932          * @param  $field
 933          * @return ORAField
 934          */
 935         function fieldInfo( $table, $field ) {
 936                 if ( is_array( $table ) ) {
 937                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 938                 }
 939                 return $this->fieldInfoMulti ($table, $field);
 940         }
 941
 942         function begin( $fname = 'DatabaseOracle::begin' ) {
 943                 $this->mTrxLevel = 1;
 944                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 945         }
 946
 947         function commit( $fname = 'DatabaseOracle::commit' ) {
 948                 if ( $this->mTrxLevel ) {
 949                         $ret = oci_commit( $this->mConn );
 950                         if ( !$ret ) {
 951                                 throw new DBUnexpectedError( $this, $this->lastError() );
 952                         }
 953                         $this->mTrxLevel = 0;
 954                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 955                 }
 956         }
 957
 958         function rollback( $fname = 'DatabaseOracle::rollback' ) {
 959                 if ( $this->mTrxLevel ) {
 960                         oci_rollback( $this->mConn );
 961                         $this->mTrxLevel = 0;
 962                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 963                 }
 964         }
 965
 966         /* Not even sure why this is used in the main codebase... */
 967         function limitResultForUpdate( $sql, $num ) {
 968                 return $sql;
 969         }
 970
 971         /* defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}'; */
 972         function sourceStream( $fp, $lineCallback = false, $resultCallback = false, $fname = 'DatabaseOracle::sourceStream' ) {
 973                 $cmd = '';
 974                 $done = false;
 975                 $dollarquote = false;
 976
 977                 $replacements = array();
 978
 979                 while ( ! feof( $fp ) ) {
 980                         if ( $lineCallback ) {
 981                                 call_user_func( $lineCallback );
 982                         }
 983                         $line = trim( fgets( $fp, 1024 ) );
 984                         $sl = strlen( $line ) - 1;
 985
 986                         if ( $sl < 0 ) {
 987                                 continue;
 988                         }
 989                         if ( '-' == $line { 0 } && '-' == $line { 1 } ) {
 990                                 continue;
 991                         }
 992
 993                         // Allow dollar quoting for function declarations
 994                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 995                                 if ( $dollarquote ) {
 996                                         $dollarquote = false;
 997                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
 998                                         $done = true;
 999                                 } else {
1000                                         $dollarquote = true;
1001                                 }
1002                         } elseif ( !$dollarquote ) {
1003                                 if ( ';' == $line { $sl } && ( $sl < 2 || ';' != $line { $sl - 1 } ) ) {
1004                                         $done = true;
1005                                         $line = substr( $line, 0, $sl );
1006                                 }
1007                         }
1008
1009                         if ( $cmd != '' ) {
1010                                 $cmd .= ' ';
1011                         }
1012                         $cmd .= "$line\n";
1013
1014                         if ( $done ) {
1015                                 $cmd = str_replace( ';;', ";", $cmd );
1016                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1017                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1018                                                 $replacements[$defines[2]] = $defines[1];
1019                                         }
1020                                 } else {
1021                                         foreach ( $replacements as $mwVar => $scVar ) {
1022                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1023                                         }
1024
1025                                         $cmd = $this->replaceVars( $cmd );
1026                                         $res = $this->doQuery( $cmd );
1027                                         if ( $resultCallback ) {
1028                                                 call_user_func( $resultCallback, $res, $this );
1029                                         }
1030
1031                                         if ( false === $res ) {
1032                                                 $err = $this->lastError();
1033                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1034                                         }
1035                                 }
1036
1037                                 $cmd = '';
1038                                 $done = false;
1039                         }
1040                 }
1041                 return true;
1042         }
1043
1044         function selectDB( $db ) {
1045                 $this->mDBname = $db;
1046                 if ( $db == null || $db == $this->mUser ) {
1047                         return true;
1048                 }
1049                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper($db);
1050                 $stmt = oci_parse( $this->mConn, $sql );
1051                 wfSuppressWarnings();
1052                 $success = oci_execute( $stmt );
1053                 wfRestoreWarnings();
1054                 if ( !$success ) {
1055                         $e = oci_error( $stmt );
1056                         if ( $e['code'] != '1435' ) {
1057                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1058                         }
1059                         return false;
1060                 }
1061                 return true;
1062         }
1063
1064         function strencode( $s ) {
1065                 return str_replace( "'", "''", $s );
1066         }
1067
1068         function addQuotes( $s ) {
1069                 global $wgContLang;
1070                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1071                         $s = $wgContLang->checkTitleEncoding( $s );
1072                 }
1073                 return "'" . $this->strencode( $s ) . "'";
1074         }
1075
1076         public function addIdentifierQuotes( $s ) {
1077                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1078                         $s = '/*Q*/' . $s;
1079                 }
1080                 return $s;
1081         }
1082
1083         public function removeIdentifierQuotes( $s ) {
1084                 return strpos($s, '/*Q*/') === FALSE ? $s : substr($s, 5);
1085         }
1086
1087         public function isQuotedIdentifier( $s ) {
1088                 return strpos($s, '/*Q*/') !== FALSE;
1089         }
1090
1091         private function wrapFieldForWhere( $table, &$col, &$val ) {
1092                 global $wgContLang;
1093
1094                 $col_info = $this->fieldInfoMulti( $table, $col );
1095                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1096                 if ( $col_type == 'CLOB' ) {
1097                         $col = 'TO_CHAR(' . $col . ')';
1098                         $val = $wgContLang->checkTitleEncoding( $val );
1099                 } elseif ( $col_type == 'VARCHAR2' && !mb_check_encoding( $val ) ) {
1100                         $val = $wgContLang->checkTitleEncoding( $val );
1101                 }
1102         }
1103
1104         private function wrapConditionsForWhere ( $table, $conds, $parentCol = null ) {
1105                 $conds2 = array();
1106                 foreach ( $conds as $col => $val ) {
1107                         if ( is_array( $val ) ) {
1108                                 $conds2[$col] = $this->wrapConditionsForWhere ( $table, $val, $col );
1109                         } else {
1110                                 if ( is_numeric( $col ) && $parentCol != null ) {
1111                                         $this->wrapFieldForWhere ( $table, $parentCol, $val );
1112                                 } else {
1113                                         $this->wrapFieldForWhere ( $table, $col, $val );
1114                                 }
1115                                 $conds2[$col] = $val;
1116                         }
1117                 }
1118                 return $conds2;
1119         }
1120
1121         function selectRow( $table, $vars, $conds, $fname = 'DatabaseOracle::selectRow', $options = array(), $join_conds = array() ) {
1122                 if ( is_array($conds) ) {
1123                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1124                 }
1125                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1126         }
1127
1128         /**
1129          * Returns an optional USE INDEX clause to go after the table, and a
1130          * string to go at the end of the query
1131          *
1132          * @private
1133          *
1134          * @param $options Array: an associative array of options to be turned into
1135          *              an SQL query, valid keys are listed in the function.
1136          * @return array
1137          */
1138         function makeSelectOptions( $options ) {
1139                 $preLimitTail = $postLimitTail = '';
1140                 $startOpts = '';
1141
1142                 $noKeyOptions = array();
1143                 foreach ( $options as $key => $option ) {
1144                         if ( is_numeric( $key ) ) {
1145                                 $noKeyOptions[$option] = true;
1146                         }
1147                 }
1148
1149                 if ( isset( $options['GROUP BY'] ) ) {
1150                         $preLimitTail .= " GROUP BY {$options['GROUP BY']}";
1151                 }
1152                 if ( isset( $options['ORDER BY'] ) ) {
1153                         $preLimitTail .= " ORDER BY {$options['ORDER BY']}";
1154                 }
1155
1156                 # if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $tailOpts .= ' FOR UPDATE';
1157                 # if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $tailOpts .= ' LOCK IN SHARE MODE';
1158                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1159                         $startOpts .= 'DISTINCT';
1160                 }
1161
1162                 if ( isset( $options['USE INDEX'] ) && ! is_array( $options['USE INDEX'] ) ) {
1163                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1164                 } else {
1165                         $useIndex = '';
1166                 }
1167
1168                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1169         }
1170
1171         public function delete( $table, $conds, $fname = 'DatabaseOracle::delete' ) {
1172                 if ( is_array($conds) ) {
1173                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1174                 }
1175                 return parent::delete( $table, $conds, $fname );
1176         }
1177
1178         function update( $table, $values, $conds, $fname = 'DatabaseOracle::update', $options = array() ) {
1179                 global $wgContLang;
1180
1181                 $table = $this->tableName( $table );
1182                 $opts = $this->makeUpdateOptions( $options );
1183                 $sql = "UPDATE $opts $table SET ";
1184
1185                 $first = true;
1186                 foreach ( $values as $col => &$val ) {
1187                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1188
1189                         if ( !$first ) {
1190                                 $sqlSet = ', ' . $sqlSet;
1191                         } else {
1192                                 $first = false;
1193                         }
1194                         $sql .= $sqlSet;
1195                 }
1196
1197                 if ( $conds != '*' ) {
1198                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1199                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1200                 }
1201
1202                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
1203                         $e = oci_error( $this->mConn );
1204                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1205                         return false;
1206                 }
1207                 foreach ( $values as $col => &$val ) {
1208                         $col_info = $this->fieldInfoMulti( $table, $col );
1209                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1210
1211                         if ( $val === null ) {
1212                                 // do nothing ... null was inserted in statement creation
1213                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1214                                 if ( is_object( $val ) ) {
1215                                         $val = $val->getData();
1216                                 }
1217
1218                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1219                                         $val = '31-12-2030 12:00:00.000000';
1220                                 }
1221
1222                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1223                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1224                                         $e = oci_error( $stmt );
1225                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1226                                         return false;
1227                                 }
1228                         } else {
1229                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
1230                                         $e = oci_error( $stmt );
1231                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1232                                 }
1233
1234                                 if ( $col_type == 'BLOB' ) {
1235                                         $lob[$col]->writeTemporary( $val );
1236                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, SQLT_BLOB );
1237                                 } else {
1238                                         $lob[$col]->writeTemporary( $val );
1239                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_CLOB );
1240                                 }
1241                         }
1242                 }
1243
1244                 wfSuppressWarnings();
1245
1246                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1247                         $e = oci_error( $stmt );
1248                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
1249                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1250                                 return false;
1251                         } else {
1252                                 $this->mAffectedRows = oci_num_rows( $stmt );
1253                         }
1254                 } else {
1255                         $this->mAffectedRows = oci_num_rows( $stmt );
1256                 }
1257
1258                 wfRestoreWarnings();
1259
1260                 if ( isset( $lob ) ) {
1261                         foreach ( $lob as $lob_v ) {
1262                                 $lob_v->free();
1263                         }
1264                 }
1265
1266                 if ( !$this->mTrxLevel ) {
1267                         oci_commit( $this->mConn );
1268                 }
1269
1270                 oci_free_statement( $stmt );
1271         }
1272
1273         function bitNot( $field ) {
1274                 // expecting bit-fields smaller than 4bytes
1275                 return 'BITNOT(' . $field . ')';
1276         }
1277
1278         function bitAnd( $fieldLeft, $fieldRight ) {
1279                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1280         }
1281
1282         function bitOr( $fieldLeft, $fieldRight ) {
1283                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1284         }
1285
1286         function setFakeMaster( $enabled = true ) { }
1287
1288         function getDBname() {
1289                 return $this->mDBname;
1290         }
1291
1292         function getServer() {
1293                 return $this->mServer;
1294         }
1295
1296         public function getSearchEngine() {
1297                 return 'SearchOracle';
1298         }
1299 } // end DatabaseOracle class