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