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                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 499                                 $bind .= 'DEFAULT';
 500                         } else {
 501                                 $bind .= 'NULL';
 502                         }
 503                 } else {
 504                         $bind .= ':' . $col;
 505                 }
 506
 507                 return $bind;
 508         }
 509
 510         private function insertOneRow( $table, $row, $fname ) {
 511                 global $wgContLang;
 512
 513                 $table = $this->tableName( $table );
 514                 // "INSERT INTO tables (a, b, c)"
 515                 $sql = "INSERT INTO " . $table . " (" . join( ',', array_keys( $row ) ) . ')';
 516                 $sql .= " VALUES (";
 517
 518                 // for each value, append ":key"
 519                 $first = true;
 520                 foreach ( $row as $col => &$val ) {
 521                         if ( !$first ) {
 522                                 $sql .= ', ';
 523                         } else {
 524                                 $first = false;
 525                         }
 526
 527                         $sql .= $this->fieldBindStatement( $table, $col, $val );
 528                 }
 529                 $sql .= ')';
 530
 531                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 532                         $e = oci_error( $this->mConn );
 533                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 534                         return false;
 535                 }
 536                 foreach ( $row as $col => &$val ) {
 537                         $col_info = $this->fieldInfoMulti( $table, $col );
 538                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 539
 540                         if ( $val === null ) {
 541                                 // do nothing ... null was inserted in statement creation
 542                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 543                                 if ( is_object( $val ) ) {
 544                                         $val = $val->fetch();
 545                                 }
 546
 547                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 548                                         $val = '31-12-2030 12:00:00.000000';
 549                                 }
 550
 551                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 552                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 553                                         $e = oci_error( $stmt );
 554                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 555                                         return false;
 556                                 }
 557                         } else {
 558                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
 559                                         $e = oci_error( $stmt );
 560                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 561                                 }
 562
 563                                 if ( is_object( $val ) ) {
 564                                         $val = $val->fetch();
 565                                 }
 566
 567                                 if ( $col_type == 'BLOB' ) {
 568                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 569                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_BLOB );
 570                                 } else {
 571                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 572                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_CLOB );
 573                                 }
 574                         }
 575                 }
 576
 577                 wfSuppressWarnings();
 578
 579                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 580                         $e = oci_error( $stmt );
 581                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 582                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 583                                 return false;
 584                         } else {
 585                                 $this->mAffectedRows = oci_num_rows( $stmt );
 586                         }
 587                 } else {
 588                         $this->mAffectedRows = oci_num_rows( $stmt );
 589                 }
 590
 591                 wfRestoreWarnings();
 592
 593                 if ( isset( $lob ) ) {
 594                         foreach ( $lob as $lob_v ) {
 595                                 $lob_v->free();
 596                         }
 597                 }
 598
 599                 if ( !$this->mTrxLevel ) {
 600                         oci_commit( $this->mConn );
 601                 }
 602
 603                 oci_free_statement( $stmt );
 604         }
 605
 606         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabaseOracle::insertSelect',
 607                 $insertOptions = array(), $selectOptions = array() )
 608         {
 609                 $destTable = $this->tableName( $destTable );
 610                 if ( !is_array( $selectOptions ) ) {
 611                         $selectOptions = array( $selectOptions );
 612                 }
 613                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 614                 if ( is_array( $srcTable ) ) {
 615                         $srcTable =  implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 616                 } else {
 617                         $srcTable = $this->tableName( $srcTable );
 618                 }
 619
 620                 if ( ( $sequenceData = $this->getSequenceData( $destTable ) ) !== false &&
 621                                 !isset( $varMap[$sequenceData['column']] ) )
 622                 {
 623                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 624                 }
 625
 626                 // count-alias subselect fields to avoid abigious definition errors
 627                 $i = 0;
 628                 foreach ( $varMap as &$val ) {
 629                         $val = $val . ' field' . ( $i++ );
 630                 }
 631
 632                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 633                         " SELECT $startOpts " . implode( ',', $varMap ) .
 634                         " FROM $srcTable $useIndex ";
 635                 if ( $conds != '*' ) {
 636                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 637                 }
 638                 $sql .= " $tailOpts";
 639
 640                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 641                         $this->ignore_DUP_VAL_ON_INDEX = true;
 642                 }
 643
 644                 $retval = $this->query( $sql, $fname );
 645
 646                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 647                         $this->ignore_DUP_VAL_ON_INDEX = false;
 648                 }
 649
 650                 return $retval;
 651         }
 652
 653         function tableName( $name, $quoted = true ) {
 654                 /*
 655                 Replace reserved words with better ones
 656                 Using uppercase because that's the only way Oracle can handle
 657                 quoted tablenames
 658                 */
 659                 switch( $name ) {
 660                         case 'user':
 661                                 $name = 'MWUSER';
 662                                 break;
 663                         case 'text':
 664                                 $name = 'PAGECONTENT';
 665                                 break;
 666                 }
 667
 668                 return parent::tableName( strtoupper( $name ), $quoted );
 669         }
 670
 671         function tableNameInternal( $name ) {
 672                 $name = $this->tableName( $name );
 673                 return preg_replace( '/.*\.(.*)/', '$1', $name);
 674         }
 675         /**
 676          * Return the next in a sequence, save the value for retrieval via insertId()
 677          */
 678         function nextSequenceValue( $seqName ) {
 679                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 680                 $row = $this->fetchRow( $res );
 681                 $this->mInsertId = $row[0];
 682                 return $this->mInsertId;
 683         }
 684
 685         /**
 686          * Return sequence_name if table has a sequence
 687          */
 688         private function getSequenceData( $table ) {
 689                 if ( $this->sequenceData == null ) {
 690                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 691                                    lower(atc.table_name),
 692                                    lower(atc.column_name)
 693                           FROM all_sequences asq, all_tab_columns atc
 694                          WHERE decode(atc.table_name, '{$this->mTablePrefix}MWUSER', '{$this->mTablePrefix}USER', atc.table_name) || '_' ||
 695                                    atc.column_name || '_SEQ' = '{$this->mTablePrefix}' || asq.sequence_name
 696                            AND asq.sequence_owner = '{$this->mDBname}'
 697                            AND atc.owner = '{$this->mDBname}'" );
 698
 699                         while ( ( $row = $result->fetchRow() ) !== false ) {
 700                                 $this->sequenceData[$this->tableName( $row[1] )] = array(
 701                                         'sequence' => $row[0],
 702                                         'column' => $row[2]
 703                                 );
 704                         }
 705                 }
 706                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 707                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 708         }
 709
 710         # Returns the size of a text field, or -1 for "unlimited"
 711         function textFieldSize( $table, $field ) {
 712                 $fieldInfoData = $this->fieldInfo( $table, $field );
 713                 return $fieldInfoData->maxLength();
 714         }
 715
 716         function limitResult( $sql, $limit, $offset = false ) {
 717                 if ( $offset === false ) {
 718                         $offset = 0;
 719                 }
 720                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 721         }
 722
 723         function encodeBlob( $b ) {
 724                 return new Blob( $b );
 725         }
 726
 727         function decodeBlob( $b ) {
 728                 if ( $b instanceof Blob ) {
 729                         $b = $b->fetch();
 730                 }
 731                 return $b;
 732         }
 733
 734         function unionQueries( $sqls, $all ) {
 735                 $glue = ' UNION ALL ';
 736                 return 'SELECT * ' . ( $all ? '':'/* UNION_UNIQUE */ ' ) . 'FROM (' . implode( $glue, $sqls ) . ')' ;
 737         }
 738
 739         function wasDeadlock() {
 740                 return $this->lastErrno() == 'OCI-00060';
 741         }
 742
 743         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabaseOracle::duplicateTableStructure' ) {
 744                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 745
 746                 $newName = strtoupper( $newName );
 747                 $oldName = strtoupper( $oldName );
 748
 749                 $tabName = substr( $newName, strlen( $this->mTablePrefix ) );
 750                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 751                 $newPrefix = strtoupper( $this->mTablePrefix );
 752
 753                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', '$oldPrefix', '$newPrefix', $temporary ); END;" );
 754         }
 755
 756         function listTables( $prefix = null, $fname = 'DatabaseOracle::listTables' ) {
 757                 $listWhere = '';
 758                 if (!empty($prefix)) {
 759                         $listWhere = ' AND table_name LIKE \''.strtoupper($prefix).'%\'';
 760                 }
 761
 762                 $owner = strtoupper( $this->mDBname );
 763                 $result = $this->doQuery( "SELECT table_name FROM all_tables WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 764
 765                 // dirty code ... i know
 766                 $endArray = array();
 767                 $endArray[] = $prefix.'MWUSER';
 768                 $endArray[] = $prefix.'PAGE';
 769                 $endArray[] = $prefix.'IMAGE';
 770                 $fixedOrderTabs = $endArray;
 771                 while (($row = $result->fetchRow()) !== false) {
 772                         if (!in_array($row['table_name'], $fixedOrderTabs))
 773                                 $endArray[] = $row['table_name'];
 774                 }
 775
 776                 return $endArray;
 777         }
 778
 779         public function dropTable( $tableName, $fName = 'DatabaseOracle::dropTable' ) {
 780                 $tableName = $this->tableName($tableName);
 781                 if( !$this->tableExists( $tableName ) ) {
 782                         return false;
 783                 }
 784
 785                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 786         }
 787
 788         function timestamp( $ts = 0 ) {
 789                 return wfTimestamp( TS_ORACLE, $ts );
 790         }
 791
 792         /**
 793          * Return aggregated value function call
 794          */
 795         function aggregateValue ( $valuedata, $valuename = 'value' ) {
 796                 return $valuedata;
 797         }
 798
 799         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 800                 # Ignore errors during error handling to avoid infinite
 801                 # recursion
 802                 $ignore = $this->ignoreErrors( true );
 803                 ++$this->mErrorCount;
 804
 805                 if ( $ignore || $tempIgnore ) {
 806                         wfDebug( "SQL ERROR (ignored): $error\n" );
 807                         $this->ignoreErrors( $ignore );
 808                 } else {
 809                         throw new DBQueryError( $this, $error, $errno, $sql, $fname );
 810                 }
 811         }
 812
 813         /**
 814          * @return string wikitext of a link to the server software's web site
 815          */
 816         public static function getSoftwareLink() {
 817                 return '[http://www.oracle.com/ Oracle]';
 818         }
 819
 820         /**
 821          * @return string Version information from the database
 822          */
 823         function getServerVersion() {
 824                 //better version number, fallback on driver
 825                 $rset = $this->doQuery( 'SELECT version FROM product_component_version WHERE UPPER(product) LIKE \'ORACLE DATABASE%\'' );
 826                 if ( !( $row =  $rset->fetchRow() ) ) {
 827                         return oci_server_version( $this->mConn );
 828                 }
 829                 return $row['version'];
 830         }
 831
 832         /**
 833          * Query whether a given index exists
 834          */
 835         function indexExists( $table, $index, $fname = 'DatabaseOracle::indexExists' ) {
 836                 $table = $this->tableName( $table );
 837                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 838                 $index = strtoupper( $index );
 839                 $owner = strtoupper( $this->mDBname );
 840                 $SQL = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 841                 $res = $this->doQuery( $SQL );
 842                 if ( $res ) {
 843                         $count = $res->numRows();
 844                         $res->free();
 845                 } else {
 846                         $count = 0;
 847                 }
 848                 return $count != 0;
 849         }
 850
 851         /**
 852          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 853          */
 854         function tableExists( $table ) {
 855                 $table = $this->tableName( $table );
 856                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 857                 $owner = $this->addQuotes( strtoupper( $this->mDBname ) );
 858                 $SQL = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 859                 $res = $this->doQuery( $SQL );
 860                 if ( $res ) {
 861                         $count = $res->numRows();
 862                         $res->free();
 863                 } else {
 864                         $count = 0;
 865                 }
 866                 return $count;
 867         }
 868
 869         /**
 870          * Function translates mysql_fetch_field() functionality on ORACLE.
 871          * Caching is present for reducing query time.
 872          * For internal calls. Use fieldInfo for normal usage.
 873          * Returns false if the field doesn't exist
 874          *
 875          * @param $table Array
 876          * @param $field String
 877          * @return ORAField|ORAResult
 878          */
 879         private function fieldInfoMulti( $table, $field ) {
 880                 $field = strtoupper( $field );
 881                 if ( is_array( $table ) ) {
 882                         $table = array_map( array( &$this, 'tableNameInternal' ), $table );
 883                         $tableWhere = 'IN (';
 884                         foreach( $table as &$singleTable ) {
 885                                 $singleTable = $this->removeIdentifierQuotes($singleTable);
 886                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 887                                         return $this->mFieldInfoCache["$singleTable.$field"];
 888                                 }
 889                                 $tableWhere .= '\'' . $singleTable . '\',';
 890                         }
 891                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 892                 } else {
 893                         $table = $this->removeIdentifierQuotes(  $this->tableNameInternal( $table ) );
 894                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 895                                 return $this->mFieldInfoCache["$table.$field"];
 896                         }
 897                         $tableWhere = '= \''.$table.'\'';
 898                 }
 899
 900                 $fieldInfoStmt = oci_parse( $this->mConn, 'SELECT * FROM wiki_field_info_full WHERE table_name '.$tableWhere.' and column_name = \''.$field.'\'' );
 901                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 902                         $e = oci_error( $fieldInfoStmt );
 903                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 904                         return false;
 905                 }
 906                 $res = new ORAResult( $this, $fieldInfoStmt );
 907                 if ( $res->numRows() == 0 ) {
 908                         if ( is_array( $table ) ) {
 909                                 foreach( $table as &$singleTable ) {
 910                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 911                                 }
 912                         } else {
 913                                 $this->mFieldInfoCache["$table.$field"] = false;
 914                         }
 915                         $fieldInfoTemp = null;
 916                 } else {
 917                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 918                         $table = $fieldInfoTemp->tableName();
 919                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 920                 }
 921                 $res->free();
 922                 return $fieldInfoTemp;
 923         }
 924
 925         /**
 926          * @throws DBUnexpectedError
 927          * @param  $table
 928          * @param  $field
 929          * @return ORAField
 930          */
 931         function fieldInfo( $table, $field ) {
 932                 if ( is_array( $table ) ) {
 933                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 934                 }
 935                 return $this->fieldInfoMulti ($table, $field);
 936         }
 937
 938         function begin( $fname = 'DatabaseOracle::begin' ) {
 939                 $this->mTrxLevel = 1;
 940                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 941         }
 942
 943         function commit( $fname = 'DatabaseOracle::commit' ) {
 944                 if ( $this->mTrxLevel ) {
 945                         $ret = oci_commit( $this->mConn );
 946                         if ( !$ret ) {
 947                                 throw new DBUnexpectedError( $this, $this->lastError() );
 948                         }
 949                         $this->mTrxLevel = 0;
 950                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 951                 }
 952         }
 953
 954         function rollback( $fname = 'DatabaseOracle::rollback' ) {
 955                 if ( $this->mTrxLevel ) {
 956                         oci_rollback( $this->mConn );
 957                         $this->mTrxLevel = 0;
 958                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 959                 }
 960         }
 961
 962         /* Not even sure why this is used in the main codebase... */
 963         function limitResultForUpdate( $sql, $num ) {
 964                 return $sql;
 965         }
 966
 967         /* defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}'; */
 968         function sourceStream( $fp, $lineCallback = false, $resultCallback = false, $fname = 'DatabaseOracle::sourceStream' ) {
 969                 $cmd = '';
 970                 $done = false;
 971                 $dollarquote = false;
 972
 973                 $replacements = array();
 974
 975                 while ( ! feof( $fp ) ) {
 976                         if ( $lineCallback ) {
 977                                 call_user_func( $lineCallback );
 978                         }
 979                         $line = trim( fgets( $fp, 1024 ) );
 980                         $sl = strlen( $line ) - 1;
 981
 982                         if ( $sl < 0 ) {
 983                                 continue;
 984                         }
 985                         if ( '-' == $line { 0 } && '-' == $line { 1 } ) {
 986                                 continue;
 987                         }
 988
 989                         // Allow dollar quoting for function declarations
 990                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 991                                 if ( $dollarquote ) {
 992                                         $dollarquote = false;
 993                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
 994                                         $done = true;
 995                                 } else {
 996                                         $dollarquote = true;
 997                                 }
 998                         } elseif ( !$dollarquote ) {
 999                                 if ( ';' == $line { $sl } && ( $sl < 2 || ';' != $line { $sl - 1 } ) ) {
1000                                         $done = true;
1001                                         $line = substr( $line, 0, $sl );
1002                                 }
1003                         }
1004
1005                         if ( $cmd != '' ) {
1006                                 $cmd .= ' ';
1007                         }
1008                         $cmd .= "$line\n";
1009
1010                         if ( $done ) {
1011                                 $cmd = str_replace( ';;', ";", $cmd );
1012                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1013                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1014                                                 $replacements[$defines[2]] = $defines[1];
1015                                         }
1016                                 } else {
1017                                         foreach ( $replacements as $mwVar => $scVar ) {
1018                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1019                                         }
1020
1021                                         $cmd = $this->replaceVars( $cmd );
1022                                         $res = $this->doQuery( $cmd );
1023                                         if ( $resultCallback ) {
1024                                                 call_user_func( $resultCallback, $res, $this );
1025                                         }
1026
1027                                         if ( false === $res ) {
1028                                                 $err = $this->lastError();
1029                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1030                                         }
1031                                 }
1032
1033                                 $cmd = '';
1034                                 $done = false;
1035                         }
1036                 }
1037                 return true;
1038         }
1039
1040         function selectDB( $db ) {
1041                 $this->mDBname = $db;
1042                 if ( $db == null || $db == $this->mUser ) {
1043                         return true;
1044                 }
1045                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper($db);
1046                 $stmt = oci_parse( $this->mConn, $sql );
1047                 wfSuppressWarnings();
1048                 $success = oci_execute( $stmt );
1049                 wfRestoreWarnings();
1050                 if ( !$success ) {
1051                         $e = oci_error( $stmt );
1052                         if ( $e['code'] != '1435' ) {
1053                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1054                         }
1055                         return false;
1056                 }
1057                 return true;
1058         }
1059
1060         function strencode( $s ) {
1061                 return str_replace( "'", "''", $s );
1062         }
1063
1064         function addQuotes( $s ) {
1065                 global $wgContLang;
1066                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1067                         $s = $wgContLang->checkTitleEncoding( $s );
1068                 }
1069                 return "'" . $this->strencode( $s ) . "'";
1070         }
1071
1072         public function addIdentifierQuotes( $s ) {
1073                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1074                         $s = '/*Q*/' . $s;
1075                 }
1076                 return $s;
1077         }
1078
1079         public function removeIdentifierQuotes( $s ) {
1080                 return strpos($s, '/*Q*/') === FALSE ? $s : substr($s, 5);
1081         }
1082
1083         public function isQuotedIdentifier( $s ) {
1084                 return strpos($s, '/*Q*/') !== FALSE;
1085         }
1086
1087         private function wrapFieldForWhere( $table, &$col, &$val ) {
1088                 global $wgContLang;
1089
1090                 $col_info = $this->fieldInfoMulti( $table, $col );
1091                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1092                 if ( $col_type == 'CLOB' ) {
1093                         $col = 'TO_CHAR(' . $col . ')';
1094                         $val = $wgContLang->checkTitleEncoding( $val );
1095                 } elseif ( $col_type == 'VARCHAR2' && !mb_check_encoding( $val ) ) {
1096                         $val = $wgContLang->checkTitleEncoding( $val );
1097                 }
1098         }
1099
1100         private function wrapConditionsForWhere ( $table, $conds, $parentCol = null ) {
1101                 $conds2 = array();
1102                 foreach ( $conds as $col => $val ) {
1103                         if ( is_array( $val ) ) {
1104                                 $conds2[$col] = $this->wrapConditionsForWhere ( $table, $val, $col );
1105                         } else {
1106                                 if ( is_numeric( $col ) && $parentCol != null ) {
1107                                         $this->wrapFieldForWhere ( $table, $parentCol, $val );
1108                                 } else {
1109                                         $this->wrapFieldForWhere ( $table, $col, $val );
1110                                 }
1111                                 $conds2[$col] = $val;
1112                         }
1113                 }
1114                 return $conds2;
1115         }
1116
1117         function selectRow( $table, $vars, $conds, $fname = 'DatabaseOracle::selectRow', $options = array(), $join_conds = array() ) {
1118                 if ( is_array($conds) ) {
1119                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1120                 }
1121                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1122         }
1123
1124         /**
1125          * Returns an optional USE INDEX clause to go after the table, and a
1126          * string to go at the end of the query
1127          *
1128          * @private
1129          *
1130          * @param $options Array: an associative array of options to be turned into
1131          *              an SQL query, valid keys are listed in the function.
1132          * @return array
1133          */
1134         function makeSelectOptions( $options ) {
1135                 $preLimitTail = $postLimitTail = '';
1136                 $startOpts = '';
1137
1138                 $noKeyOptions = array();
1139                 foreach ( $options as $key => $option ) {
1140                         if ( is_numeric( $key ) ) {
1141                                 $noKeyOptions[$option] = true;
1142                         }
1143                 }
1144
1145                 if ( isset( $options['GROUP BY'] ) ) {
1146                         $preLimitTail .= " GROUP BY {$options['GROUP BY']}";
1147                 }
1148                 if ( isset( $options['ORDER BY'] ) ) {
1149                         $preLimitTail .= " ORDER BY {$options['ORDER BY']}";
1150                 }
1151
1152                 # if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $tailOpts .= ' FOR UPDATE';
1153                 # if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $tailOpts .= ' LOCK IN SHARE MODE';
1154                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1155                         $startOpts .= 'DISTINCT';
1156                 }
1157
1158                 if ( isset( $options['USE INDEX'] ) && ! is_array( $options['USE INDEX'] ) ) {
1159                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1160                 } else {
1161                         $useIndex = '';
1162                 }
1163
1164                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1165         }
1166
1167         public function delete( $table, $conds, $fname = 'DatabaseOracle::delete' ) {
1168                 if ( is_array($conds) ) {
1169                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1170                 }
1171                 return parent::delete( $table, $conds, $fname );
1172         }
1173
1174         function update( $table, $values, $conds, $fname = 'DatabaseOracle::update', $options = array() ) {
1175                 global $wgContLang;
1176
1177                 $table = $this->tableName( $table );
1178                 $opts = $this->makeUpdateOptions( $options );
1179                 $sql = "UPDATE $opts $table SET ";
1180
1181                 $first = true;
1182                 foreach ( $values as $col => &$val ) {
1183                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1184
1185                         if ( !$first ) {
1186                                 $sqlSet = ', ' . $sqlSet;
1187                         } else {
1188                                 $first = false;
1189                         }
1190                         $sql .= $sqlSet;
1191                 }
1192
1193                 if ( $conds != '*' ) {
1194                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1195                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1196                 }
1197
1198                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
1199                         $e = oci_error( $this->mConn );
1200                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1201                         return false;
1202                 }
1203                 foreach ( $values as $col => &$val ) {
1204                         $col_info = $this->fieldInfoMulti( $table, $col );
1205                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1206
1207                         if ( $val === null ) {
1208                                 // do nothing ... null was inserted in statement creation
1209                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1210                                 if ( is_object( $val ) ) {
1211                                         $val = $val->getData();
1212                                 }
1213
1214                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1215                                         $val = '31-12-2030 12:00:00.000000';
1216                                 }
1217
1218                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1219                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1220                                         $e = oci_error( $stmt );
1221                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1222                                         return false;
1223                                 }
1224                         } else {
1225                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
1226                                         $e = oci_error( $stmt );
1227                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1228                                 }
1229
1230                                 if ( $col_type == 'BLOB' ) {
1231                                         $lob[$col]->writeTemporary( $val );
1232                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, SQLT_BLOB );
1233                                 } else {
1234                                         $lob[$col]->writeTemporary( $val );
1235                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_CLOB );
1236                                 }
1237                         }
1238                 }
1239
1240                 wfSuppressWarnings();
1241
1242                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1243                         $e = oci_error( $stmt );
1244                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
1245                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1246                                 return false;
1247                         } else {
1248                                 $this->mAffectedRows = oci_num_rows( $stmt );
1249                         }
1250                 } else {
1251                         $this->mAffectedRows = oci_num_rows( $stmt );
1252                 }
1253
1254                 wfRestoreWarnings();
1255
1256                 if ( isset( $lob ) ) {
1257                         foreach ( $lob as $lob_v ) {
1258                                 $lob_v->free();
1259                         }
1260                 }
1261
1262                 if ( !$this->mTrxLevel ) {
1263                         oci_commit( $this->mConn );
1264                 }
1265
1266                 oci_free_statement( $stmt );
1267         }
1268
1269         function bitNot( $field ) {
1270                 // expecting bit-fields smaller than 4bytes
1271                 return 'BITNOT(' . $field . ')';
1272         }
1273
1274         function bitAnd( $fieldLeft, $fieldRight ) {
1275                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1276         }
1277
1278         function bitOr( $fieldLeft, $fieldRight ) {
1279                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1280         }
1281
1282         function setFakeMaster( $enabled = true ) { }
1283
1284         function getDBname() {
1285                 return $this->mDBname;
1286         }
1287
1288         function getServer() {
1289                 return $this->mServer;
1290         }
1291
1292         public function getSearchEngine() {
1293                 return 'SearchOracle';
1294         }
1295 } // end DatabaseOracle class