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 $array_out;
  35         }
  36
  37         function __construct( &$db, $stmt, $unique = false ) {
  38                 $this->db =& $db;
  39
  40                 if ( ( $this->nrows = oci_fetch_all( $stmt, $this->rows, 0, - 1, OCI_FETCHSTATEMENT_BY_ROW | OCI_NUM ) ) === false ) {
  41                         $e = oci_error( $stmt );
  42                         $db->reportQueryError( $e['message'], $e['code'], '', __METHOD__ );
  43                         $this->free();
  44                         return;
  45                 }
  46
  47                 if ( $unique ) {
  48                         $this->rows = $this->array_unique_md( $this->rows );
  49                         $this->nrows = count( $this->rows );
  50                 }
  51
  52                 if ($this->nrows > 0) {
  53                         foreach ( $this->rows[0] as $k => $v ) {
  54                                 $this->columns[$k] = strtolower( oci_field_name( $stmt, $k + 1 ) );
  55                         }
  56                 }
  57
  58                 $this->cursor = 0;
  59                 oci_free_statement( $stmt );
  60         }
  61
  62         public function free() {
  63                 unset($this->db);
  64         }
  65
  66         public function seek( $row ) {
  67                 $this->cursor = min( $row, $this->nrows );
  68         }
  69
  70         public function numRows() {
  71                 return $this->nrows;
  72         }
  73
  74         public function numFields() {
  75                 return count($this->columns);
  76         }
  77
  78         public function fetchObject() {
  79                 if ( $this->cursor >= $this->nrows ) {
  80                         return false;
  81                 }
  82                 $row = $this->rows[$this->cursor++];
  83                 $ret = new stdClass();
  84                 foreach ( $row as $k => $v ) {
  85                         $lc = $this->columns[$k];
  86                         $ret->$lc = $v;
  87                 }
  88
  89                 return $ret;
  90         }
  91
  92         public function fetchRow() {
  93                 if ( $this->cursor >= $this->nrows ) {
  94                         return false;
  95                 }
  96
  97                 $row = $this->rows[$this->cursor++];
  98                 $ret = array();
  99                 foreach ( $row as $k => $v ) {
 100                         $lc = $this->columns[$k];
 101                         $ret[$lc] = $v;
 102                         $ret[$k] = $v;
 103                 }
 104                 return $ret;
 105         }
 106 }
 107
 108 /**
 109  * Utility class.
 110  * @ingroup Database
 111  */
 112 class ORAField implements Field {
 113         private $name, $tablename, $default, $max_length, $nullable,
 114                 $is_pk, $is_unique, $is_multiple, $is_key, $type;
 115
 116         function __construct( $info ) {
 117                 $this->name = $info['column_name'];
 118                 $this->tablename = $info['table_name'];
 119                 $this->default = $info['data_default'];
 120                 $this->max_length = $info['data_length'];
 121                 $this->nullable = $info['not_null'];
 122                 $this->is_pk = isset( $info['prim'] ) && $info['prim'] == 1 ? 1 : 0;
 123                 $this->is_unique = isset( $info['uniq'] ) && $info['uniq'] == 1 ? 1 : 0;
 124                 $this->is_multiple = isset( $info['nonuniq'] ) && $info['nonuniq'] == 1 ? 1 : 0;
 125                 $this->is_key = ( $this->is_pk || $this->is_unique || $this->is_multiple );
 126                 $this->type = $info['data_type'];
 127         }
 128
 129         function name() {
 130                 return $this->name;
 131         }
 132
 133         function tableName() {
 134                 return $this->tablename;
 135         }
 136
 137         function defaultValue() {
 138                 return $this->default;
 139         }
 140
 141         function maxLength() {
 142                 return $this->max_length;
 143         }
 144
 145         function isNullable() {
 146                 return $this->nullable;
 147         }
 148
 149         function isKey() {
 150                 return $this->is_key;
 151         }
 152
 153         function isMultipleKey() {
 154                 return $this->is_multiple;
 155         }
 156
 157         function type() {
 158                 return $this->type;
 159         }
 160 }
 161
 162 /**
 163  * @ingroup Database
 164  */
 165 class DatabaseOracle extends DatabaseBase {
 166         var $mInsertId = null;
 167         var $mLastResult = null;
 168         var $lastResult = null;
 169         var $cursor = 0;
 170         var $mAffectedRows;
 171
 172         var $ignore_DUP_VAL_ON_INDEX = false;
 173         var $sequenceData = null;
 174
 175         var $defaultCharset = 'AL32UTF8';
 176
 177         var $mFieldInfoCache = array();
 178
 179         function __construct( $server = false, $user = false, $password = false, $dbName = false,
 180                 $flags = 0, $tablePrefix = 'get from global' )
 181         {
 182                 $tablePrefix = $tablePrefix == 'get from global' ? $tablePrefix : strtoupper( $tablePrefix );
 183                 parent::__construct( $server, $user, $password, $dbName, $flags, $tablePrefix );
 184                 wfRunHooks( 'DatabaseOraclePostInit', array( $this ) );
 185         }
 186
 187         function getType() {
 188                 return 'oracle';
 189         }
 190
 191         function cascadingDeletes() {
 192                 return true;
 193         }
 194         function cleanupTriggers() {
 195                 return true;
 196         }
 197         function strictIPs() {
 198                 return true;
 199         }
 200         function realTimestamps() {
 201                 return true;
 202         }
 203         function implicitGroupby() {
 204                 return false;
 205         }
 206         function implicitOrderby() {
 207                 return false;
 208         }
 209         function searchableIPs() {
 210                 return true;
 211         }
 212
 213         /**
 214          * Usually aborts on failure
 215          */
 216         function open( $server, $user, $password, $dbName ) {
 217                 if ( !function_exists( 'oci_connect' ) ) {
 218                         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" );
 219                 }
 220
 221                 $this->close();
 222                 $this->mUser = $user;
 223                 $this->mPassword = $password;
 224                 // changed internal variables functions
 225                 // mServer now holds the TNS endpoint
 226                 // mDBname is schema name if different from username
 227                 if ( !$server ) {
 228                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 229                         $this->mServer = $dbName;
 230                         $this->mDBname = $user;
 231                 } else {
 232                         $this->mServer = $server;
 233                         if ( !$dbName ) {
 234                                 $this->mDBname = $user;
 235                         } else {
 236                                 $this->mDBname = $dbName;
 237                         }
 238                 }
 239
 240                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 241                         return;
 242                 }
 243
 244                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 245                 wfSuppressWarnings();
 246                 if ( $this->mFlags & DBO_DEFAULT ) {
 247                         $this->mConn = oci_new_connect( $this->mUser, $this->mPassword, $this->mServer, $this->defaultCharset, $session_mode );
 248                 } else {
 249                         $this->mConn = oci_connect( $this->mUser, $this->mPassword, $this->mServer, $this->defaultCharset, $session_mode );
 250                 }
 251                 wfRestoreWarnings();
 252
 253                 if ( $this->mUser != $this->mDBname ) {
 254                         //change current schema in session
 255                         $this->selectDB( $this->mDBname );
 256                 }
 257
 258                 if ( !$this->mConn ) {
 259                         throw new DBConnectionError( $this, $this->lastError() );
 260                 }
 261
 262                 $this->mOpened = true;
 263
 264                 # removed putenv calls because they interfere with the system globaly
 265                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 266                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 267                 return $this->mConn;
 268         }
 269
 270         /**
 271          * Closes a database connection, if it is open
 272          * Returns success, true if already closed
 273          */
 274         function close() {
 275                 $this->mOpened = false;
 276                 if ( $this->mConn ) {
 277                         return oci_close( $this->mConn );
 278                 } else {
 279                         return true;
 280                 }
 281         }
 282
 283         function execFlags() {
 284                 return $this->mTrxLevel ? OCI_DEFAULT : OCI_COMMIT_ON_SUCCESS;
 285         }
 286
 287         function doQuery( $sql ) {
 288                 wfDebug( "SQL: [$sql]\n" );
 289                 if ( !mb_check_encoding( $sql ) ) {
 290                         throw new MWException( "SQL encoding is invalid\n$sql" );
 291                 }
 292
 293                 // handle some oracle specifics
 294                 // remove AS column/table/subquery namings
 295                 if( !$this->getFlag( DBO_DDLMODE ) ) {
 296                         $sql = preg_replace( '/ as /i', ' ', $sql );
 297                 }
 298
 299                 // Oracle has issues with UNION clause if the statement includes LOB fields
 300                 // So we do a UNION ALL and then filter the results array with array_unique
 301                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 302                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 303                 // you have to select data from plan table after explain
 304                 $explain_id = date( 'dmYHis' );
 305
 306                 $sql = preg_replace( '/^EXPLAIN /', 'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR', $sql, 1, $explain_count );
 307
 308                 wfSuppressWarnings();
 309
 310                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 311                         $e = oci_error( $this->mConn );
 312                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 313                         return false;
 314                 }
 315
 316                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 317                         $e = oci_error( $stmt );
 318                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 319                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 320                                 return false;
 321                         }
 322                 }
 323
 324                 wfRestoreWarnings();
 325
 326                 if ( $explain_count > 0 ) {
 327                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table WHERE statement_id = \'' . $explain_id . '\'' );
 328                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 329                         return new ORAResult( $this, $stmt, $union_unique );
 330                 } else {
 331                         $this->mAffectedRows = oci_num_rows( $stmt );
 332                         return true;
 333                 }
 334         }
 335
 336         function queryIgnore( $sql, $fname = '' ) {
 337                 return $this->query( $sql, $fname, true );
 338         }
 339
 340         function freeResult( $res ) {
 341                 if ( $res instanceof ResultWrapper ) {
 342                         $res = $res->result;
 343                 }
 344
 345                 $res->free();
 346         }
 347
 348         function fetchObject( $res ) {
 349                 if ( $res instanceof ResultWrapper ) {
 350                         $res = $res->result;
 351                 }
 352
 353                 return $res->fetchObject();
 354         }
 355
 356         function fetchRow( $res ) {
 357                 if ( $res instanceof ResultWrapper ) {
 358                         $res = $res->result;
 359                 }
 360
 361                 return $res->fetchRow();
 362         }
 363
 364         function numRows( $res ) {
 365                 if ( $res instanceof ResultWrapper ) {
 366                         $res = $res->result;
 367                 }
 368
 369                 return $res->numRows();
 370         }
 371
 372         function numFields( $res ) {
 373                 if ( $res instanceof ResultWrapper ) {
 374                         $res = $res->result;
 375                 }
 376
 377                 return $res->numFields();
 378         }
 379
 380         function fieldName( $stmt, $n ) {
 381                 return oci_field_name( $stmt, $n );
 382         }
 383
 384         /**
 385          * This must be called after nextSequenceVal
 386          */
 387         function insertId() {
 388                 return $this->mInsertId;
 389         }
 390
 391         function dataSeek( $res, $row ) {
 392                 if ( $res instanceof ORAResult ) {
 393                         $res->seek( $row );
 394                 } else {
 395                         $res->result->seek( $row );
 396                 }
 397         }
 398
 399         function lastError() {
 400                 if ( $this->mConn === false ) {
 401                         $e = oci_error();
 402                 } else {
 403                         $e = oci_error( $this->mConn );
 404                 }
 405                 return $e['message'];
 406         }
 407
 408         function lastErrno() {
 409                 if ( $this->mConn === false ) {
 410                         $e = oci_error();
 411                 } else {
 412                         $e = oci_error( $this->mConn );
 413                 }
 414                 return $e['code'];
 415         }
 416
 417         function affectedRows() {
 418                 return $this->mAffectedRows;
 419         }
 420
 421         /**
 422          * Returns information about an index
 423          * If errors are explicitly ignored, returns NULL on failure
 424          */
 425         function indexInfo( $table, $index, $fname = 'DatabaseOracle::indexExists' ) {
 426                 return false;
 427         }
 428
 429         function indexUnique( $table, $index, $fname = 'DatabaseOracle::indexUnique' ) {
 430                 return false;
 431         }
 432
 433         function insert( $table, $a, $fname = 'DatabaseOracle::insert', $options = array() ) {
 434                 if ( !count( $a ) ) {
 435                         return true;
 436                 }
 437
 438                 if ( !is_array( $options ) ) {
 439                         $options = array( $options );
 440                 }
 441
 442                 if ( in_array( 'IGNORE', $options ) ) {
 443                         $this->ignore_DUP_VAL_ON_INDEX = true;
 444                 }
 445
 446                 if ( !is_array( reset( $a ) ) ) {
 447                         $a = array( $a );
 448                 }
 449
 450                 foreach ( $a as &$row ) {
 451                         $this->insertOneRow( $table, $row, $fname );
 452                 }
 453                 $retVal = true;
 454
 455                 if ( in_array( 'IGNORE', $options ) ) {
 456                         $this->ignore_DUP_VAL_ON_INDEX = false;
 457                 }
 458
 459                 return $retVal;
 460         }
 461
 462         private function fieldBindStatement ( $table, $col, &$val, $includeCol = false ) {
 463                 $col_info = $this->fieldInfoMulti( $table, $col );
 464                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 465
 466                 $bind = '';
 467                 if ( is_numeric( $col ) ) {
 468                         $bind = $val;
 469                         $val = null;
 470                         return $bind;
 471                 } else if ( $includeCol ) {
 472                         $bind = "$col = ";
 473                 }
 474
 475                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 476                         $val = null;
 477                 }
 478
 479                 if ( $val === null ) {
 480                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 481                                 $bind .= 'DEFAULT';
 482                         } else {
 483                                 $bind .= 'NULL';
 484                         }
 485                 } else {
 486                         $bind .= ':' . $col;
 487                 }
 488
 489                 return $bind;
 490         }
 491
 492         private function insertOneRow( $table, $row, $fname ) {
 493                 global $wgContLang;
 494
 495                 $table = $this->tableName( $table );
 496                 // "INSERT INTO tables (a, b, c)"
 497                 $sql = "INSERT INTO " . $table . " (" . join( ',', array_keys( $row ) ) . ')';
 498                 $sql .= " VALUES (";
 499
 500                 // for each value, append ":key"
 501                 $first = true;
 502                 foreach ( $row as $col => &$val ) {
 503                         if ( !$first ) {
 504                                 $sql .= ', ';
 505                         } else {
 506                                 $first = false;
 507                         }
 508
 509                         $sql .= $this->fieldBindStatement( $table, $col, $val );
 510                 }
 511                 $sql .= ')';
 512
 513                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 514                         $e = oci_error( $this->mConn );
 515                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 516                         return false;
 517                 }
 518                 foreach ( $row as $col => &$val ) {
 519                         $col_info = $this->fieldInfoMulti( $table, $col );
 520                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 521
 522                         if ( $val === null ) {
 523                                 // do nothing ... null was inserted in statement creation
 524                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 525                                 if ( is_object( $val ) ) {
 526                                         $val = $val->fetch();
 527                                 }
 528
 529                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 530                                         $val = '31-12-2030 12:00:00.000000';
 531                                 }
 532
 533                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 534                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
 535                                         $e = oci_error( $stmt );
 536                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 537                                         return false;
 538                                 }
 539                         } else {
 540                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
 541                                         $e = oci_error( $stmt );
 542                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 543                                 }
 544
 545                                 if ( is_object( $val ) ) {
 546                                         $val = $val->fetch();
 547                                 }
 548
 549                                 if ( $col_type == 'BLOB' ) {
 550                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 551                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_BLOB );
 552                                 } else {
 553                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 554                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_CLOB );
 555                                 }
 556                         }
 557                 }
 558
 559                 wfSuppressWarnings();
 560
 561                 if ( oci_execute( $stmt, OCI_DEFAULT ) === false ) {
 562                         $e = oci_error( $stmt );
 563                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 564                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 565                                 return false;
 566                         } else {
 567                                 $this->mAffectedRows = oci_num_rows( $stmt );
 568                         }
 569                 } else {
 570                         $this->mAffectedRows = oci_num_rows( $stmt );
 571                 }
 572
 573                 wfRestoreWarnings();
 574
 575                 if ( isset( $lob ) ) {
 576                         foreach ( $lob as $lob_v ) {
 577                                 $lob_v->free();
 578                         }
 579                 }
 580
 581                 if ( !$this->mTrxLevel ) {
 582                         oci_commit( $this->mConn );
 583                 }
 584
 585                 oci_free_statement( $stmt );
 586         }
 587
 588         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = 'DatabaseOracle::insertSelect',
 589                 $insertOptions = array(), $selectOptions = array() )
 590         {
 591                 $destTable = $this->tableName( $destTable );
 592                 if ( !is_array( $selectOptions ) ) {
 593                         $selectOptions = array( $selectOptions );
 594                 }
 595                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 596                 if ( is_array( $srcTable ) ) {
 597                         $srcTable =  implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 598                 } else {
 599                         $srcTable = $this->tableName( $srcTable );
 600                 }
 601
 602                 if ( ( $sequenceData = $this->getSequenceData( $destTable ) ) !== false &&
 603                                 !isset( $varMap[$sequenceData['column']] ) )
 604                 {
 605                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 606                 }
 607
 608                 // count-alias subselect fields to avoid abigious definition errors
 609                 $i = 0;
 610                 foreach ( $varMap as &$val ) {
 611                         $val = $val . ' field' . ( $i++ );
 612                 }
 613
 614                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 615                         " SELECT $startOpts " . implode( ',', $varMap ) .
 616                         " FROM $srcTable $useIndex ";
 617                 if ( $conds != '*' ) {
 618                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 619                 }
 620                 $sql .= " $tailOpts";
 621
 622                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 623                         $this->ignore_DUP_VAL_ON_INDEX = true;
 624                 }
 625
 626                 $retval = $this->query( $sql, $fname );
 627
 628                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 629                         $this->ignore_DUP_VAL_ON_INDEX = false;
 630                 }
 631
 632                 return $retval;
 633         }
 634
 635         function tableName( $name, $quoted ) {
 636                 /*
 637                 Replace reserved words with better ones
 638                 Using uppercase because that's the only way Oracle can handle
 639                 quoted tablenames
 640                 */
 641                 switch( $name ) {
 642                         case 'user':
 643                                 $name = 'MWUSER';
 644                                 break;
 645                         case 'text':
 646                                 $name = 'PAGECONTENT';
 647                                 break;
 648                 }
 649
 650                 return parent::tableName( strtoupper( $name ), $quoted );
 651         }
 652
 653         /**
 654          * Return the next in a sequence, save the value for retrieval via insertId()
 655          */
 656         function nextSequenceValue( $seqName ) {
 657                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 658                 $row = $this->fetchRow( $res );
 659                 $this->mInsertId = $row[0];
 660                 return $this->mInsertId;
 661         }
 662
 663         /**
 664          * Return sequence_name if table has a sequence
 665          */
 666         private function getSequenceData( $table ) {
 667                 if ( $this->sequenceData == null ) {
 668                         $result = $this->doQuery( 'SELECT lower(us.sequence_name), lower(utc.table_name), lower(utc.column_name) from user_sequences us, user_tab_columns utc where us.sequence_name = utc.table_name||\'_\'||utc.column_name||\'_SEQ\'' );
 669
 670                         while ( ( $row = $result->fetchRow() ) !== false ) {
 671                                 $this->sequenceData[$this->tableName( $row[1] )] = array(
 672                                         'sequence' => $row[0],
 673                                         'column' => $row[2]
 674                                 );
 675                         }
 676                 }
 677
 678                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 679         }
 680
 681         /**
 682          * REPLACE query wrapper
 683          * Oracle simulates this with a DELETE followed by INSERT
 684          * $row is the row to insert, an associative array
 685          * $uniqueIndexes is an array of indexes. Each element may be either a
 686          * field name or an array of field names
 687          *
 688          * It may be more efficient to leave off unique indexes which are unlikely to collide.
 689          * However if you do this, you run the risk of encountering errors which wouldn't have
 690          * occurred in MySQL.
 691          *
 692          * @param $table String: table name
 693          * @param $uniqueIndexes Array: array of indexes. Each element may be
 694          *                       either a field name or an array of field names
 695          * @param $rows Array: rows to insert to $table
 696          * @param $fname String: function name, you can use __METHOD__ here
 697          */
 698         function replace( $table, $uniqueIndexes, $rows, $fname = 'DatabaseOracle::replace' ) {
 699                 $table = $this->tableName( $table );
 700
 701                 if ( count( $rows ) == 0 ) {
 702                         return;
 703                 }
 704
 705                 # Single row case
 706                 if ( !is_array( reset( $rows ) ) ) {
 707                         $rows = array( $rows );
 708                 }
 709
 710                 $sequenceData = $this->getSequenceData( $table );
 711
 712                 foreach ( $rows as $row ) {
 713                         # Delete rows which collide
 714                         if ( $uniqueIndexes ) {
 715                                 $condsDelete = array();
 716                                 foreach ( $uniqueIndexes as $index ) {
 717                                         $condsDelete[$index] = $row[$index];
 718                                 }
 719                                 if ( count( $condsDelete ) > 0 ) {
 720                                         $this->delete( $table, $condsDelete, $fname );
 721                                 }
 722                         }
 723
 724                         if ( $sequenceData !== false && !isset( $row[$sequenceData['column']] ) ) {
 725                                 $row[$sequenceData['column']] = $this->nextSequenceValue( $sequenceData['sequence'] );
 726                         }
 727
 728                         # Now insert the row
 729                         $this->insert( $table, $row, $fname );
 730                 }
 731         }
 732
 733         # DELETE where the condition is a join
 734         function deleteJoin( $delTable, $joinTable, $delVar, $joinVar, $conds, $fname = 'DatabaseOracle::deleteJoin' ) {
 735                 if ( !$conds ) {
 736                         throw new DBUnexpectedError( $this, 'DatabaseOracle::deleteJoin() called with empty $conds' );
 737                 }
 738
 739                 $delTable = $this->tableName( $delTable );
 740                 $joinTable = $this->tableName( $joinTable );
 741                 $sql = "DELETE FROM $delTable WHERE $delVar IN (SELECT $joinVar FROM $joinTable ";
 742                 if ( $conds != '*' ) {
 743                         $sql .= 'WHERE ' . $this->makeList( $conds, LIST_AND );
 744                 }
 745                 $sql .= ')';
 746
 747                 $this->query( $sql, $fname );
 748         }
 749
 750         # Returns the size of a text field, or -1 for "unlimited"
 751         function textFieldSize( $table, $field ) {
 752                 $fieldInfoData = $this->fieldInfo( $table, $field );
 753                 return $fieldInfoData->maxLength();
 754         }
 755
 756         function limitResult( $sql, $limit, $offset = false ) {
 757                 if ( $offset === false ) {
 758                         $offset = 0;
 759                 }
 760                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 761         }
 762
 763         function encodeBlob( $b ) {
 764                 return new Blob( $b );
 765         }
 766
 767         function decodeBlob( $b ) {
 768                 if ( $b instanceof Blob ) {
 769                         $b = $b->fetch();
 770                 }
 771                 return $b;
 772         }
 773
 774         function unionQueries( $sqls, $all ) {
 775                 $glue = ' UNION ALL ';
 776                 return 'SELECT * ' . ( $all ? '':'/* UNION_UNIQUE */ ' ) . 'FROM (' . implode( $glue, $sqls ) . ')' ;
 777         }
 778
 779         function wasDeadlock() {
 780                 return $this->lastErrno() == 'OCI-00060';
 781         }
 782
 783         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = 'DatabaseOracle::duplicateTableStructure' ) {
 784                 global $wgDBprefix;
 785                 $this->setFlag( DBO_DDLMODE );
 786
 787                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 788
 789                 $newName = strtoupper( $newName );
 790                 $oldName = strtoupper( $oldName );
 791
 792                 $tabName = $this->addIdentifierQuotes( substr( $newName, strlen( $wgDBprefix ) ) );
 793                 $oldPrefix = $this->addIdentifierQuotes( substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) ) );
 794                 $newPrefix = $this->addIdentifierQuotes( $wgDBprefix );
 795
 796                 $this->clearFlag( DBO_DDLMODE );
 797                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( $tabName, $oldPrefix, $newPrefix, $temporary ); END;" );
 798         }
 799
 800         function listTables( $prefix = null, $fname = 'DatabaseOracle::listTables' ) {
 801                 $listWhere = '';
 802                 if (!empty($prefix)) {
 803                         $listWhere = ' AND table_name LIKE \''.strtoupper($prefix).'%\'';
 804                 }
 805
 806                 $result = $this->doQuery( "SELECT table_name FROM user_tables WHERE table_name NOT LIKE '%!_IDX$_' ESCAPE '!' $listWhere" );
 807
 808                 // dirty code ... i know
 809                 $endArray = array();
 810                 $endArray[] = $prefix.'MWUSER';
 811                 $endArray[] = $prefix.'PAGE';
 812                 $endArray[] = $prefix.'IMAGE';
 813                 $fixedOrderTabs = $endArray;
 814                 while (($row = $result->fetchRow()) !== false) {
 815                         if (!in_array($row['table_name'], $fixedOrderTabs))
 816                                 $endArray[] = $row['table_name'];
 817                 }
 818
 819                 return $endArray;
 820         }
 821
 822         public function dropTable( $tableName, $fName = 'DatabaseOracle::dropTable' ) {
 823                 $tableName = $this->tableName($tableName);
 824                 if( !$this->tableExists( $tableName ) ) {
 825                         return false;
 826                 }
 827
 828                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 829         }
 830
 831         function timestamp( $ts = 0 ) {
 832                 return wfTimestamp( TS_ORACLE, $ts );
 833         }
 834
 835         /**
 836          * Return aggregated value function call
 837          */
 838         function aggregateValue ( $valuedata, $valuename = 'value' ) {
 839                 return $valuedata;
 840         }
 841
 842         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 843                 # Ignore errors during error handling to avoid infinite
 844                 # recursion
 845                 $ignore = $this->ignoreErrors( true );
 846                 ++$this->mErrorCount;
 847
 848                 if ( $ignore || $tempIgnore ) {
 849                         wfDebug( "SQL ERROR (ignored): $error\n" );
 850                         $this->ignoreErrors( $ignore );
 851                 } else {
 852                         throw new DBQueryError( $this, $error, $errno, $sql, $fname );
 853                 }
 854         }
 855
 856         /**
 857          * @return string wikitext of a link to the server software's web site
 858          */
 859         public static function getSoftwareLink() {
 860                 return '[http://www.oracle.com/ Oracle]';
 861         }
 862
 863         /**
 864          * @return string Version information from the database
 865          */
 866         function getServerVersion() {
 867                 //better version number, fallback on driver
 868                 $rset = $this->doQuery( 'SELECT version FROM product_component_version WHERE UPPER(product) LIKE \'ORACLE DATABASE%\'' );
 869                 if ( !( $row =  $rset->fetchRow() ) ) {
 870                         return oci_server_version( $this->mConn );
 871                 }
 872                 return $row['version'];
 873         }
 874
 875         /**
 876          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 877          */
 878         function tableExists( $table ) {
 879                 $table = trim($this->tableName($table), '"');
 880                 $SQL = "SELECT 1 FROM user_tables WHERE table_name='$table'";
 881                 $res = $this->doQuery( $SQL );
 882                 if ( $res ) {
 883                         $count = $res->numRows();
 884                         $res->free();
 885                 } else {
 886                         $count = 0;
 887                 }
 888                 return $count;
 889         }
 890
 891         /**
 892          * Function translates mysql_fetch_field() functionality on ORACLE.
 893          * Caching is present for reducing query time.
 894          * For internal calls. Use fieldInfo for normal usage.
 895          * Returns false if the field doesn't exist
 896          *
 897          * @param $table Array
 898          * @param $field String
 899          * @return ORAField
 900          */
 901         private function fieldInfoMulti( $table, $field ) {
 902                 $field = strtoupper( $field );
 903                 if ( is_array( $table ) ) {
 904                         $table = array_map( array( &$this, 'tableName' ), $table );
 905                         $tableWhere = 'IN (';
 906                         foreach( $table as &$singleTable ) {
 907                                 $singleTable = strtoupper( trim( $singleTable, '"' ) );
 908                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 909                                         return $this->mFieldInfoCache["$singleTable.$field"];
 910                                 }
 911                                 $tableWhere .= '\'' . $singleTable . '\',';
 912                         }
 913                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 914                 } else {
 915                         $table = strtoupper( trim( $this->tableName( $table ), '"' ) );
 916                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 917                                 return $this->mFieldInfoCache["$table.$field"];
 918                         }
 919                         $tableWhere = '= \''.$table.'\'';
 920                 }
 921
 922                 $fieldInfoStmt = oci_parse( $this->mConn, 'SELECT * FROM wiki_field_info_full WHERE table_name '.$tableWhere.' and column_name = \''.$field.'\'' );
 923                 if ( oci_execute( $fieldInfoStmt, OCI_DEFAULT ) === false ) {
 924                         $e = oci_error( $fieldInfoStmt );
 925                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 926                         return false;
 927                 }
 928                 $res = new ORAResult( $this, $fieldInfoStmt );
 929                 if ( $res->numRows() == 0 ) {
 930                         if ( is_array( $table ) ) {
 931                                 foreach( $table as &$singleTable ) {
 932                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 933                                 }
 934                         } else {
 935                                 $this->mFieldInfoCache["$table.$field"] = false;
 936                         }
 937                         $fieldInfoTemp = null;
 938                 } else {
 939                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 940                         $table = $fieldInfoTemp->tableName();
 941                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 942                 }
 943                 $res->free();
 944                 return $fieldInfoTemp;
 945         }
 946
 947         /**
 948          * @throws DBUnexpectedError
 949          * @param  $table
 950          * @param  $field
 951          * @return ORAField
 952          */
 953         function fieldInfo( $table, $field ) {
 954                 if ( is_array( $table ) ) {
 955                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 956                 }
 957                 return $this->fieldInfoMulti ($table, $field);
 958         }
 959
 960         function begin( $fname = '' ) {
 961                 $this->mTrxLevel = 1;
 962         }
 963
 964         function commit( $fname = '' ) {
 965                 oci_commit( $this->mConn );
 966                 $this->mTrxLevel = 0;
 967         }
 968
 969         /* Not even sure why this is used in the main codebase... */
 970         function limitResultForUpdate( $sql, $num ) {
 971                 return $sql;
 972         }
 973
 974         /* defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}'; */
 975         function sourceStream( $fp, $lineCallback = false, $resultCallback = false, $fname = 'DatabaseOracle::sourceStream' ) {
 976                 $cmd = '';
 977                 $done = false;
 978                 $dollarquote = false;
 979
 980                 $replacements = array();
 981
 982                 while ( ! feof( $fp ) ) {
 983                         if ( $lineCallback ) {
 984                                 call_user_func( $lineCallback );
 985                         }
 986                         $line = trim( fgets( $fp, 1024 ) );
 987                         $sl = strlen( $line ) - 1;
 988
 989                         if ( $sl < 0 ) {
 990                                 continue;
 991                         }
 992                         if ( '-' == $line { 0 } && '-' == $line { 1 } ) {
 993                                 continue;
 994                         }
 995
 996                         // Allow dollar quoting for function declarations
 997                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 998                                 if ( $dollarquote ) {
 999                                         $dollarquote = false;
1000                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
1001                                         $done = true;
1002                                 } else {
1003                                         $dollarquote = true;
1004                                 }
1005                         } elseif ( !$dollarquote ) {
1006                                 if ( ';' == $line { $sl } && ( $sl < 2 || ';' != $line { $sl - 1 } ) ) {
1007                                         $done = true;
1008                                         $line = substr( $line, 0, $sl );
1009                                 }
1010                         }
1011
1012                         if ( $cmd != '' ) {
1013                                 $cmd .= ' ';
1014                         }
1015                         $cmd .= "$line\n";
1016
1017                         if ( $done ) {
1018                                 $cmd = str_replace( ';;', ";", $cmd );
1019                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1020                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1021                                                 $replacements[$defines[2]] = $defines[1];
1022                                         }
1023                                 } else {
1024                                         foreach ( $replacements as $mwVar => $scVar ) {
1025                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1026                                         }
1027
1028                                         $cmd = $this->replaceVars( $cmd );
1029                                         $res = $this->doQuery( $cmd );
1030                                         if ( $resultCallback ) {
1031                                                 call_user_func( $resultCallback, $res, $this );
1032                                         }
1033
1034                                         if ( false === $res ) {
1035                                                 $err = $this->lastError();
1036                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1037                                         }
1038                                 }
1039
1040                                 $cmd = '';
1041                                 $done = false;
1042                         }
1043                 }
1044                 return true;
1045         }
1046
1047         function selectDB( $db ) {
1048                 $this->mDBname = $db;
1049                 if ( $db == null || $db == $this->mUser ) {
1050                         return true;
1051                 }
1052                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper($db);
1053                 $stmt = oci_parse( $this->mConn, $sql );
1054                 wfSuppressWarnings();
1055                 $success = oci_execute( $stmt );
1056                 wfRestoreWarnings();
1057                 if ( !$success ) {
1058                         $e = oci_error( $stmt );
1059                         if ( $e['code'] != '1435' ) {
1060                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1061                         }
1062                         return false;
1063                 }
1064                 return true;
1065         }
1066
1067         function strencode( $s ) {
1068                 return str_replace( "'", "''", $s );
1069         }
1070
1071         function addQuotes( $s ) {
1072                 global $wgContLang;
1073                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1074                         $s = $wgContLang->checkTitleEncoding( $s );
1075                 }
1076                 return "'" . $this->strencode( $s ) . "'";
1077         }
1078
1079         public function addIdentifierQuotes( $s ) {
1080                 return parent::addIdentifierQuotes( $s );
1081
1082                 /* Does this old code make any sense?
1083                  * We could always use quoted identifier.
1084                  * See http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/sql_elements008.htm
1085                  */
1086                 if ( !$this->mFlags & DBO_DDLMODE ) {
1087                         $s = '"' . str_replace( '"', '""', $s ) . '"';
1088                 }
1089                 return $s;
1090         }
1091
1092         function selectRow( $table, $vars, $conds, $fname = 'DatabaseOracle::selectRow', $options = array(), $join_conds = array() ) {
1093                 global $wgContLang;
1094
1095                 if ($conds != null) {
1096                         $conds2 = array();
1097                         $conds = ( !is_array( $conds ) ) ? array( $conds ) : $conds;
1098                         foreach ( $conds as $col => $val ) {
1099                                 $col_info = $this->fieldInfoMulti( $table, $col );
1100                                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1101                                 if ( $col_type == 'CLOB' ) {
1102                                         $conds2['TO_CHAR(' . $col . ')'] = $wgContLang->checkTitleEncoding( $val );
1103                                 } elseif ( $col_type == 'VARCHAR2' && !mb_check_encoding( $val ) ) {
1104                                         $conds2[$col] = $wgContLang->checkTitleEncoding( $val );
1105                                 } else {
1106                                         $conds2[$col] = $val;
1107                                 }
1108                         }
1109
1110                         return parent::selectRow( $table, $vars, $conds2, $fname, $options, $join_conds );
1111                 } else {
1112                         return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1113                 }
1114         }
1115
1116         /**
1117          * Returns an optional USE INDEX clause to go after the table, and a
1118          * string to go at the end of the query
1119          *
1120          * @private
1121          *
1122          * @param $options Array: an associative array of options to be turned into
1123          *              an SQL query, valid keys are listed in the function.
1124          * @return array
1125          */
1126         function makeSelectOptions( $options ) {
1127                 $preLimitTail = $postLimitTail = '';
1128                 $startOpts = '';
1129
1130                 $noKeyOptions = array();
1131                 foreach ( $options as $key => $option ) {
1132                         if ( is_numeric( $key ) ) {
1133                                 $noKeyOptions[$option] = true;
1134                         }
1135                 }
1136
1137                 if ( isset( $options['GROUP BY'] ) ) {
1138                         $preLimitTail .= " GROUP BY {$options['GROUP BY']}";
1139                 }
1140                 if ( isset( $options['ORDER BY'] ) ) {
1141                         $preLimitTail .= " ORDER BY {$options['ORDER BY']}";
1142                 }
1143
1144                 # if ( isset( $noKeyOptions['FOR UPDATE'] ) ) $tailOpts .= ' FOR UPDATE';
1145                 # if ( isset( $noKeyOptions['LOCK IN SHARE MODE'] ) ) $tailOpts .= ' LOCK IN SHARE MODE';
1146                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1147                         $startOpts .= 'DISTINCT';
1148                 }
1149
1150                 if ( isset( $options['USE INDEX'] ) && ! is_array( $options['USE INDEX'] ) ) {
1151                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1152                 } else {
1153                         $useIndex = '';
1154                 }
1155
1156                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1157         }
1158
1159         public function delete( $table, $conds, $fname = 'DatabaseOracle::delete' ) {
1160                 global $wgContLang;
1161
1162                 if ( $wgContLang != null && $conds != null && $conds != '*' ) {
1163                         $conds2 = array();
1164                         $conds = ( !is_array( $conds ) ) ? array( $conds ) : $conds;
1165                         foreach ( $conds as $col => $val ) {
1166                                 $col_info = $this->fieldInfoMulti( $table, $col );
1167                                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1168                                 if ( $col_type == 'CLOB' ) {
1169                                         $conds2['TO_CHAR(' . $col . ')'] = $wgContLang->checkTitleEncoding( $val );
1170                                 } else {
1171                                         if ( is_array( $val ) ) {
1172                                                 $conds2[$col] = $val;
1173                                                 foreach ( $conds2[$col] as &$val2 ) {
1174                                                         $val2 = $wgContLang->checkTitleEncoding( $val2 );
1175                                                 }
1176                                         } else {
1177                                                 $conds2[$col] = $wgContLang->checkTitleEncoding( $val );
1178                                         }
1179                                 }
1180                         }
1181
1182                         return parent::delete( $table, $conds2, $fname );
1183                 } else {
1184                         return parent::delete( $table, $conds, $fname );
1185                 }
1186         }
1187
1188         function update( $table, $values, $conds, $fname = 'DatabaseOracle::update', $options = array() ) {
1189                 global $wgContLang;
1190
1191                 $table = $this->tableName( $table );
1192                 $opts = $this->makeUpdateOptions( $options );
1193                 $sql = "UPDATE $opts $table SET ";
1194
1195                 $first = true;
1196                 foreach ( $values as $col => &$val ) {
1197                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1198
1199                         if ( !$first ) {
1200                                 $sqlSet = ', ' . $sqlSet;
1201                         } else {
1202                                 $first = false;
1203                         }
1204                         $sql .= $sqlSet;
1205                 }
1206
1207                 if ( $conds != '*' ) {
1208                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1209                 }
1210
1211                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
1212                         $e = oci_error( $this->mConn );
1213                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1214                         return false;
1215                 }
1216                 foreach ( $values as $col => &$val ) {
1217                         $col_info = $this->fieldInfoMulti( $table, $col );
1218                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1219
1220                         if ( $val === null ) {
1221                                 // do nothing ... null was inserted in statement creation
1222                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1223                                 if ( is_object( $val ) ) {
1224                                         $val = $val->getData();
1225                                 }
1226
1227                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1228                                         $val = '31-12-2030 12:00:00.000000';
1229                                 }
1230
1231                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1232                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1233                                         $e = oci_error( $stmt );
1234                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1235                                         return false;
1236                                 }
1237                         } else {
1238                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
1239                                         $e = oci_error( $stmt );
1240                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1241                                 }
1242
1243                                 if ( $col_type == 'BLOB' ) {
1244                                         $lob[$col]->writeTemporary( $val );
1245                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, SQLT_BLOB );
1246                                 } else {
1247                                         $lob[$col]->writeTemporary( $val );
1248                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_CLOB );
1249                                 }
1250                         }
1251                 }
1252
1253                 wfSuppressWarnings();
1254
1255                 if ( oci_execute( $stmt, OCI_DEFAULT ) === false ) {
1256                         $e = oci_error( $stmt );
1257                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
1258                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1259                                 return false;
1260                         } else {
1261                                 $this->mAffectedRows = oci_num_rows( $stmt );
1262                         }
1263                 } else {
1264                         $this->mAffectedRows = oci_num_rows( $stmt );
1265                 }
1266
1267                 wfRestoreWarnings();
1268
1269                 if ( isset( $lob ) ) {
1270                         foreach ( $lob as $lob_v ) {
1271                                 $lob_v->free();
1272                         }
1273                 }
1274
1275                 if ( !$this->mTrxLevel ) {
1276                         oci_commit( $this->mConn );
1277                 }
1278
1279                 oci_free_statement( $stmt );
1280         }
1281
1282         function bitNot( $field ) {
1283                 // expecting bit-fields smaller than 4bytes
1284                 return 'BITNOT(' . $field . ')';
1285         }
1286
1287         function bitAnd( $fieldLeft, $fieldRight ) {
1288                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1289         }
1290
1291         function bitOr( $fieldLeft, $fieldRight ) {
1292                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1293         }
1294
1295         function setFakeMaster( $enabled = true ) { }
1296
1297         function getDBname() {
1298                 return $this->mDBname;
1299         }
1300
1301         function getServer() {
1302                 return $this->mServer;
1303         }
1304
1305         public function getSearchEngine() {
1306                 return 'SearchOracle';
1307         }
1308 } // end DatabaseOracle class