includes/db/DatabaseOracle.php

   1 <?php
   2 /**
   3  * This is the Oracle database abstraction layer.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Database
  22  */
  23
  24 /**
  25  * The oci8 extension is fairly weak and doesn't support oci_num_rows, among
  26  * other things. We use a wrapper class to handle that and other
  27  * Oracle-specific bits, like converting column names back to lowercase.
  28  * @ingroup Database
  29  */
  30 class ORAResult {
  31         private $rows;
  32         private $cursor;
  33         private $nrows;
  34
  35         private $columns = array();
  36
  37         private function array_unique_md( $array_in ) {
  38                 $array_out = array();
  39                 $array_hashes = array();
  40
  41                 foreach ( $array_in as $item ) {
  42                         $hash = md5( serialize( $item ) );
  43                         if ( !isset( $array_hashes[$hash] ) ) {
  44                                 $array_hashes[$hash] = $hash;
  45                                 $array_out[] = $item;
  46                         }
  47                 }
  48
  49                 return $array_out;
  50         }
  51
  52         /**
  53          * @param $db DatabaseBase
  54          * @param $stmt
  55          * @param bool $unique
  56          */
  57         function __construct( &$db, $stmt, $unique = false ) {
  58                 $this->db =& $db;
  59
  60                 if ( ( $this->nrows = oci_fetch_all( $stmt, $this->rows, 0, - 1, OCI_FETCHSTATEMENT_BY_ROW | OCI_NUM ) ) === false ) {
  61                         $e = oci_error( $stmt );
  62                         $db->reportQueryError( $e['message'], $e['code'], '', __METHOD__ );
  63                         $this->free();
  64                         return;
  65                 }
  66
  67                 if ( $unique ) {
  68                         $this->rows = $this->array_unique_md( $this->rows );
  69                         $this->nrows = count( $this->rows );
  70                 }
  71
  72                 if ( $this->nrows > 0 ) {
  73                         foreach ( $this->rows[0] as $k => $v ) {
  74                                 $this->columns[$k] = strtolower( oci_field_name( $stmt, $k + 1 ) );
  75                         }
  76                 }
  77
  78                 $this->cursor = 0;
  79                 oci_free_statement( $stmt );
  80         }
  81
  82         public function free() {
  83                 unset( $this->db );
  84         }
  85
  86         public function seek( $row ) {
  87                 $this->cursor = min( $row, $this->nrows );
  88         }
  89
  90         public function numRows() {
  91                 return $this->nrows;
  92         }
  93
  94         public function numFields() {
  95                 return count( $this->columns );
  96         }
  97
  98         public function fetchObject() {
  99                 if ( $this->cursor >= $this->nrows ) {
 100                         return false;
 101                 }
 102                 $row = $this->rows[$this->cursor++];
 103                 $ret = new stdClass();
 104                 foreach ( $row as $k => $v ) {
 105                         $lc = $this->columns[$k];
 106                         $ret->$lc = $v;
 107                 }
 108
 109                 return $ret;
 110         }
 111
 112         public function fetchRow() {
 113                 if ( $this->cursor >= $this->nrows ) {
 114                         return false;
 115                 }
 116
 117                 $row = $this->rows[$this->cursor++];
 118                 $ret = array();
 119                 foreach ( $row as $k => $v ) {
 120                         $lc = $this->columns[$k];
 121                         $ret[$lc] = $v;
 122                         $ret[$k] = $v;
 123                 }
 124                 return $ret;
 125         }
 126 }
 127
 128 /**
 129  * Utility class.
 130  * @ingroup Database
 131  */
 132 class ORAField implements Field {
 133         private $name, $tablename, $default, $max_length, $nullable,
 134                 $is_pk, $is_unique, $is_multiple, $is_key, $type;
 135
 136         function __construct( $info ) {
 137                 $this->name = $info['column_name'];
 138                 $this->tablename = $info['table_name'];
 139                 $this->default = $info['data_default'];
 140                 $this->max_length = $info['data_length'];
 141                 $this->nullable = $info['not_null'];
 142                 $this->is_pk = isset( $info['prim'] ) && $info['prim'] == 1 ? 1 : 0;
 143                 $this->is_unique = isset( $info['uniq'] ) && $info['uniq'] == 1 ? 1 : 0;
 144                 $this->is_multiple = isset( $info['nonuniq'] ) && $info['nonuniq'] == 1 ? 1 : 0;
 145                 $this->is_key = ( $this->is_pk || $this->is_unique || $this->is_multiple );
 146                 $this->type = $info['data_type'];
 147         }
 148
 149         function name() {
 150                 return $this->name;
 151         }
 152
 153         function tableName() {
 154                 return $this->tablename;
 155         }
 156
 157         function defaultValue() {
 158                 return $this->default;
 159         }
 160
 161         function maxLength() {
 162                 return $this->max_length;
 163         }
 164
 165         function isNullable() {
 166                 return $this->nullable;
 167         }
 168
 169         function isKey() {
 170                 return $this->is_key;
 171         }
 172
 173         function isMultipleKey() {
 174                 return $this->is_multiple;
 175         }
 176
 177         function type() {
 178                 return $this->type;
 179         }
 180 }
 181
 182 /**
 183  * @ingroup Database
 184  */
 185 class DatabaseOracle extends DatabaseBase {
 186         var $mInsertId = null;
 187         var $mLastResult = null;
 188         var $lastResult = null;
 189         var $cursor = 0;
 190         var $mAffectedRows;
 191
 192         var $ignore_DUP_VAL_ON_INDEX = false;
 193         var $sequenceData = null;
 194
 195         var $defaultCharset = 'AL32UTF8';
 196
 197         var $mFieldInfoCache = array();
 198
 199         function __construct( $server = false, $user = false, $password = false, $dbName = false,
 200                 $flags = 0, $tablePrefix = 'get from global' )
 201         {
 202                 global $wgDBprefix;
 203                 $tablePrefix = $tablePrefix == 'get from global' ? strtoupper( $wgDBprefix ) : strtoupper( $tablePrefix );
 204                 parent::__construct( $server, $user, $password, $dbName, $flags, $tablePrefix );
 205                 wfRunHooks( 'DatabaseOraclePostInit', array( $this ) );
 206         }
 207
 208         function __destruct() {
 209                 if ( $this->mOpened ) {
 210                         wfSuppressWarnings();
 211                         $this->close();
 212                         wfRestoreWarnings();
 213                 }
 214         }
 215
 216         function getType() {
 217                 return 'oracle';
 218         }
 219
 220         function cascadingDeletes() {
 221                 return true;
 222         }
 223         function cleanupTriggers() {
 224                 return true;
 225         }
 226         function strictIPs() {
 227                 return true;
 228         }
 229         function realTimestamps() {
 230                 return true;
 231         }
 232         function implicitGroupby() {
 233                 return false;
 234         }
 235         function implicitOrderby() {
 236                 return false;
 237         }
 238         function searchableIPs() {
 239                 return true;
 240         }
 241
 242         /**
 243          * Usually aborts on failure
 244          * @param string $server
 245          * @param string $user
 246          * @param string $password
 247          * @param string $dbName
 248          * @throws DBConnectionError
 249          * @return DatabaseBase|null
 250          */
 251         function open( $server, $user, $password, $dbName ) {
 252                 global $wgDBOracleDRCP;
 253                 if ( !function_exists( 'oci_connect' ) ) {
 254                         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" );
 255                 }
 256
 257                 $this->close();
 258                 $this->mUser = $user;
 259                 $this->mPassword = $password;
 260                 // changed internal variables functions
 261                 // mServer now holds the TNS endpoint
 262                 // mDBname is schema name if different from username
 263                 if ( !$server ) {
 264                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 265                         $this->mServer = $dbName;
 266                         $this->mDBname = $user;
 267                 } else {
 268                         $this->mServer = $server;
 269                         if ( !$dbName ) {
 270                                 $this->mDBname = $user;
 271                         } else {
 272                                 $this->mDBname = $dbName;
 273                         }
 274                 }
 275
 276                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 277                         return;
 278                 }
 279
 280                 if ( $wgDBOracleDRCP ) {
 281                         $this->setFlag( DBO_PERSISTENT );
 282                 }
 283
 284                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 285
 286                 wfSuppressWarnings();
 287                 if ( $this->mFlags & DBO_PERSISTENT ) {
 288                         $this->mConn = oci_pconnect( $this->mUser, $this->mPassword, $this->mServer, $this->defaultCharset, $session_mode );
 289                 } else if ( $this->mFlags & DBO_DEFAULT ) {
 290                         $this->mConn = oci_new_connect( $this->mUser, $this->mPassword, $this->mServer, $this->defaultCharset, $session_mode );
 291                 } else {
 292                         $this->mConn = oci_connect( $this->mUser, $this->mPassword, $this->mServer, $this->defaultCharset, $session_mode );
 293                 }
 294                 wfRestoreWarnings();
 295
 296                 if ( $this->mUser != $this->mDBname ) {
 297                         //change current schema in session
 298                         $this->selectDB( $this->mDBname );
 299                 }
 300
 301                 if ( !$this->mConn ) {
 302                         throw new DBConnectionError( $this, $this->lastError() );
 303                 }
 304
 305                 $this->mOpened = true;
 306
 307                 # removed putenv calls because they interfere with the system globaly
 308                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 309                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 310                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 311                 return $this->mConn;
 312         }
 313
 314         /**
 315          * Closes a database connection, if it is open
 316          * Returns success, true if already closed
 317          * @return bool
 318          */
 319         protected function closeConnection() {
 320                 return oci_close( $this->mConn );
 321         }
 322
 323         function execFlags() {
 324                 return $this->mTrxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 325         }
 326
 327         protected function doQuery( $sql ) {
 328                 wfDebug( "SQL: [$sql]\n" );
 329                 if ( !StringUtils::isUtf8( $sql ) ) {
 330                         throw new MWException( "SQL encoding is invalid\n$sql" );
 331                 }
 332
 333                 // handle some oracle specifics
 334                 // remove AS column/table/subquery namings
 335                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 336                         $sql = preg_replace( '/ as /i', ' ', $sql );
 337                 }
 338
 339                 // Oracle has issues with UNION clause if the statement includes LOB fields
 340                 // So we do a UNION ALL and then filter the results array with array_unique
 341                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 342                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 343                 // you have to select data from plan table after explain
 344                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 345
 346                 $sql = preg_replace( '/^EXPLAIN /', 'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR', $sql, 1, $explain_count );
 347
 348                 wfSuppressWarnings();
 349
 350                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 351                         $e = oci_error( $this->mConn );
 352                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 353                         return false;
 354                 }
 355
 356                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 357                         $e = oci_error( $stmt );
 358                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 359                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 360                                 return false;
 361                         }
 362                 }
 363
 364                 wfRestoreWarnings();
 365
 366                 if ( $explain_count > 0 ) {
 367                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table WHERE statement_id = \'' . $explain_id . '\'' );
 368                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 369                         return new ORAResult( $this, $stmt, $union_unique );
 370                 } else {
 371                         $this->mAffectedRows = oci_num_rows( $stmt );
 372                         return true;
 373                 }
 374         }
 375
 376         function queryIgnore( $sql, $fname = '' ) {
 377                 return $this->query( $sql, $fname, true );
 378         }
 379
 380         function freeResult( $res ) {
 381                 if ( $res instanceof ResultWrapper ) {
 382                         $res = $res->result;
 383                 }
 384
 385                 $res->free();
 386         }
 387
 388         function fetchObject( $res ) {
 389                 if ( $res instanceof ResultWrapper ) {
 390                         $res = $res->result;
 391                 }
 392
 393                 return $res->fetchObject();
 394         }
 395
 396         function fetchRow( $res ) {
 397                 if ( $res instanceof ResultWrapper ) {
 398                         $res = $res->result;
 399                 }
 400
 401                 return $res->fetchRow();
 402         }
 403
 404         function numRows( $res ) {
 405                 if ( $res instanceof ResultWrapper ) {
 406                         $res = $res->result;
 407                 }
 408
 409                 return $res->numRows();
 410         }
 411
 412         function numFields( $res ) {
 413                 if ( $res instanceof ResultWrapper ) {
 414                         $res = $res->result;
 415                 }
 416
 417                 return $res->numFields();
 418         }
 419
 420         function fieldName( $stmt, $n ) {
 421                 return oci_field_name( $stmt, $n );
 422         }
 423
 424         /**
 425          * This must be called after nextSequenceVal
 426          * @return null
 427          */
 428         function insertId() {
 429                 return $this->mInsertId;
 430         }
 431
 432         function dataSeek( $res, $row ) {
 433                 if ( $res instanceof ORAResult ) {
 434                         $res->seek( $row );
 435                 } else {
 436                         $res->result->seek( $row );
 437                 }
 438         }
 439
 440         function lastError() {
 441                 if ( $this->mConn === false ) {
 442                         $e = oci_error();
 443                 } else {
 444                         $e = oci_error( $this->mConn );
 445                 }
 446                 return $e['message'];
 447         }
 448
 449         function lastErrno() {
 450                 if ( $this->mConn === false ) {
 451                         $e = oci_error();
 452                 } else {
 453                         $e = oci_error( $this->mConn );
 454                 }
 455                 return $e['code'];
 456         }
 457
 458         function affectedRows() {
 459                 return $this->mAffectedRows;
 460         }
 461
 462         /**
 463          * Returns information about an index
 464          * If errors are explicitly ignored, returns NULL on failure
 465          * @return bool
 466          */
 467         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 468                 return false;
 469         }
 470
 471         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 472                 return false;
 473         }
 474
 475         function insert( $table, $a, $fname = __METHOD__, $options = array() ) {
 476                 if ( !count( $a ) ) {
 477                         return true;
 478                 }
 479
 480                 if ( !is_array( $options ) ) {
 481                         $options = array( $options );
 482                 }
 483
 484                 if ( in_array( 'IGNORE', $options ) ) {
 485                         $this->ignore_DUP_VAL_ON_INDEX = true;
 486                 }
 487
 488                 if ( !is_array( reset( $a ) ) ) {
 489                         $a = array( $a );
 490                 }
 491
 492                 foreach ( $a as &$row ) {
 493                         $this->insertOneRow( $table, $row, $fname );
 494                 }
 495                 $retVal = true;
 496
 497                 if ( in_array( 'IGNORE', $options ) ) {
 498                         $this->ignore_DUP_VAL_ON_INDEX = false;
 499                 }
 500
 501                 return $retVal;
 502         }
 503
 504         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 505                 $col_info = $this->fieldInfoMulti( $table, $col );
 506                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 507
 508                 $bind = '';
 509                 if ( is_numeric( $col ) ) {
 510                         $bind = $val;
 511                         $val = null;
 512                         return $bind;
 513                 } elseif ( $includeCol ) {
 514                         $bind = "$col = ";
 515                 }
 516
 517                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 518                         $val = null;
 519                 }
 520
 521                 if ( $val === 'NULL' ) {
 522                         $val = null;
 523                 }
 524
 525                 if ( $val === null ) {
 526                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 527                                 $bind .= 'DEFAULT';
 528                         } else {
 529                                 $bind .= 'NULL';
 530                         }
 531                 } else {
 532                         $bind .= ':' . $col;
 533                 }
 534
 535                 return $bind;
 536         }
 537
 538         private function insertOneRow( $table, $row, $fname ) {
 539                 global $wgContLang;
 540
 541                 $table = $this->tableName( $table );
 542                 // "INSERT INTO tables (a, b, c)"
 543                 $sql = "INSERT INTO " . $table . " (" . join( ',', array_keys( $row ) ) . ')';
 544                 $sql .= " VALUES (";
 545
 546                 // for each value, append ":key"
 547                 $first = true;
 548                 foreach ( $row as $col => &$val ) {
 549                         if ( !$first ) {
 550                                 $sql .= ', ';
 551                         } else {
 552                                 $first = false;
 553                         }
 554
 555                         $sql .= $this->fieldBindStatement( $table, $col, $val );
 556                 }
 557                 $sql .= ')';
 558
 559                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 560                         $e = oci_error( $this->mConn );
 561                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 562                         return false;
 563                 }
 564                 foreach ( $row as $col => &$val ) {
 565                         $col_info = $this->fieldInfoMulti( $table, $col );
 566                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 567
 568                         if ( $val === null ) {
 569                                 // do nothing ... null was inserted in statement creation
 570                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 571                                 if ( is_object( $val ) ) {
 572                                         $val = $val->fetch();
 573                                 }
 574
 575                                 // backward compatibility
 576                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 577                                         $val = $this->getInfinity();
 578                                 }
 579
 580                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 581                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 582                                         $e = oci_error( $stmt );
 583                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 584                                         return false;
 585                                 }
 586                         } else {
 587                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
 588                                         $e = oci_error( $stmt );
 589                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 590                                 }
 591
 592                                 if ( is_object( $val ) ) {
 593                                         $val = $val->fetch();
 594                                 }
 595
 596                                 if ( $col_type == 'BLOB' ) {
 597                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 598                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_BLOB );
 599                                 } else {
 600                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 601                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_CLOB );
 602                                 }
 603                         }
 604                 }
 605
 606                 wfSuppressWarnings();
 607
 608                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 609                         $e = oci_error( $stmt );
 610                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
 611                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 612                                 return false;
 613                         } else {
 614                                 $this->mAffectedRows = oci_num_rows( $stmt );
 615                         }
 616                 } else {
 617                         $this->mAffectedRows = oci_num_rows( $stmt );
 618                 }
 619
 620                 wfRestoreWarnings();
 621
 622                 if ( isset( $lob ) ) {
 623                         foreach ( $lob as $lob_v ) {
 624                                 $lob_v->free();
 625                         }
 626                 }
 627
 628                 if ( !$this->mTrxLevel ) {
 629                         oci_commit( $this->mConn );
 630                 }
 631
 632                 oci_free_statement( $stmt );
 633         }
 634
 635         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 636                 $insertOptions = array(), $selectOptions = array() )
 637         {
 638                 $destTable = $this->tableName( $destTable );
 639                 if ( !is_array( $selectOptions ) ) {
 640                         $selectOptions = array( $selectOptions );
 641                 }
 642                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 643                 if ( is_array( $srcTable ) ) {
 644                         $srcTable = implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 645                 } else {
 646                         $srcTable = $this->tableName( $srcTable );
 647                 }
 648
 649                 if ( ( $sequenceData = $this->getSequenceData( $destTable ) ) !== false &&
 650                                 !isset( $varMap[$sequenceData['column']] ) )
 651                 {
 652                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 653                 }
 654
 655                 // count-alias subselect fields to avoid abigious definition errors
 656                 $i = 0;
 657                 foreach ( $varMap as &$val ) {
 658                         $val = $val . ' field' . ( $i++ );
 659                 }
 660
 661                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 662                         " SELECT $startOpts " . implode( ',', $varMap ) .
 663                         " FROM $srcTable $useIndex ";
 664                 if ( $conds != '*' ) {
 665                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 666                 }
 667                 $sql .= " $tailOpts";
 668
 669                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 670                         $this->ignore_DUP_VAL_ON_INDEX = true;
 671                 }
 672
 673                 $retval = $this->query( $sql, $fname );
 674
 675                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 676                         $this->ignore_DUP_VAL_ON_INDEX = false;
 677                 }
 678
 679                 return $retval;
 680         }
 681
 682         function tableName( $name, $format = 'quoted' ) {
 683                 /*
 684                 Replace reserved words with better ones
 685                 Using uppercase because that's the only way Oracle can handle
 686                 quoted tablenames
 687                 */
 688                 switch ( $name ) {
 689                         case 'user':
 690                                 $name = 'MWUSER';
 691                                 break;
 692                         case 'text':
 693                                 $name = 'PAGECONTENT';
 694                                 break;
 695                 }
 696
 697                 return parent::tableName( strtoupper( $name ), $format );
 698         }
 699
 700         function tableNameInternal( $name ) {
 701                 $name = $this->tableName( $name );
 702                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 703         }
 704         /**
 705          * Return the next in a sequence, save the value for retrieval via insertId()
 706          * @return null
 707          */
 708         function nextSequenceValue( $seqName ) {
 709                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 710                 $row = $this->fetchRow( $res );
 711                 $this->mInsertId = $row[0];
 712                 return $this->mInsertId;
 713         }
 714
 715         /**
 716          * Return sequence_name if table has a sequence
 717          * @return bool
 718          */
 719         private function getSequenceData( $table ) {
 720                 if ( $this->sequenceData == null ) {
 721                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 722                                    lower(atc.table_name),
 723                                    lower(atc.column_name)
 724                           FROM all_sequences asq, all_tab_columns atc
 725                          WHERE decode(atc.table_name, '{$this->mTablePrefix}MWUSER', '{$this->mTablePrefix}USER', atc.table_name) || '_' ||
 726                                    atc.column_name || '_SEQ' = '{$this->mTablePrefix}' || asq.sequence_name
 727                            AND asq.sequence_owner = upper('{$this->mDBname}')
 728                            AND atc.owner = upper('{$this->mDBname}')" );
 729
 730                         while ( ( $row = $result->fetchRow() ) !== false ) {
 731                                 $this->sequenceData[$row[1]] = array(
 732                                         'sequence' => $row[0],
 733                                         'column' => $row[2]
 734                                 );
 735                         }
 736                 }
 737                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 738                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 739         }
 740
 741         # Returns the size of a text field, or -1 for "unlimited"
 742         function textFieldSize( $table, $field ) {
 743                 $fieldInfoData = $this->fieldInfo( $table, $field );
 744                 return $fieldInfoData->maxLength();
 745         }
 746
 747         function limitResult( $sql, $limit, $offset = false ) {
 748                 if ( $offset === false ) {
 749                         $offset = 0;
 750                 }
 751                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 752         }
 753
 754         function encodeBlob( $b ) {
 755                 return new Blob( $b );
 756         }
 757
 758         function decodeBlob( $b ) {
 759                 if ( $b instanceof Blob ) {
 760                         $b = $b->fetch();
 761                 }
 762                 return $b;
 763         }
 764
 765         function unionQueries( $sqls, $all ) {
 766                 $glue = ' UNION ALL ';
 767                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) . 'FROM (' . implode( $glue, $sqls ) . ')';
 768         }
 769
 770         function wasDeadlock() {
 771                 return $this->lastErrno() == 'OCI-00060';
 772         }
 773
 774         function duplicateTableStructure( $oldName, $newName, $temporary = false, $fname = __METHOD__ ) {
 775                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 776
 777                 $newName = strtoupper( $newName );
 778                 $oldName = strtoupper( $oldName );
 779
 780                 $tabName = substr( $newName, strlen( $this->mTablePrefix ) );
 781                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 782                 $newPrefix = strtoupper( $this->mTablePrefix );
 783
 784                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', '$oldPrefix', '$newPrefix', $temporary ); END;" );
 785         }
 786
 787         function listTables( $prefix = null, $fname = __METHOD__ ) {
 788                 $listWhere = '';
 789                 if ( !empty( $prefix ) ) {
 790                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 791                 }
 792
 793                 $owner = strtoupper( $this->mDBname );
 794                 $result = $this->doQuery( "SELECT table_name FROM all_tables WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 795
 796                 // dirty code ... i know
 797                 $endArray = array();
 798                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 799                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 800                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 801                 $fixedOrderTabs = $endArray;
 802                 while ( ( $row = $result->fetchRow() ) !== false ) {
 803                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 804                                 $endArray[] = $row['table_name'];
 805                         }
 806                 }
 807
 808                 return $endArray;
 809         }
 810
 811         public function dropTable( $tableName, $fName = __METHOD__ ) {
 812                 $tableName = $this->tableName( $tableName );
 813                 if ( !$this->tableExists( $tableName ) ) {
 814                         return false;
 815                 }
 816
 817                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 818         }
 819
 820         function timestamp( $ts = 0 ) {
 821                 return wfTimestamp( TS_ORACLE, $ts );
 822         }
 823
 824         /**
 825          * Return aggregated value function call
 826          */
 827         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 828                 return $valuedata;
 829         }
 830
 831         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 832                 # Ignore errors during error handling to avoid infinite
 833                 # recursion
 834                 $ignore = $this->ignoreErrors( true );
 835                 ++$this->mErrorCount;
 836
 837                 if ( $ignore || $tempIgnore ) {
 838                         wfDebug( "SQL ERROR (ignored): $error\n" );
 839                         $this->ignoreErrors( $ignore );
 840                 } else {
 841                         throw new DBQueryError( $this, $error, $errno, $sql, $fname );
 842                 }
 843         }
 844
 845         /**
 846          * @return string wikitext of a link to the server software's web site
 847          */
 848         public function getSoftwareLink() {
 849                 return '[http://www.oracle.com/ Oracle]';
 850         }
 851
 852         /**
 853          * @return string Version information from the database
 854          */
 855         function getServerVersion() {
 856                 //better version number, fallback on driver
 857                 $rset = $this->doQuery( 'SELECT version FROM product_component_version WHERE UPPER(product) LIKE \'ORACLE DATABASE%\'' );
 858                 if ( !( $row = $rset->fetchRow() ) ) {
 859                         return oci_server_version( $this->mConn );
 860                 }
 861                 return $row['version'];
 862         }
 863
 864         /**
 865          * Query whether a given index exists
 866          * @return bool
 867          */
 868         function indexExists( $table, $index, $fname = __METHOD__ ) {
 869                 $table = $this->tableName( $table );
 870                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 871                 $index = strtoupper( $index );
 872                 $owner = strtoupper( $this->mDBname );
 873                 $SQL = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 874                 $res = $this->doQuery( $SQL );
 875                 if ( $res ) {
 876                         $count = $res->numRows();
 877                         $res->free();
 878                 } else {
 879                         $count = 0;
 880                 }
 881                 return $count != 0;
 882         }
 883
 884         /**
 885          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 886          * @return int
 887          */
 888         function tableExists( $table, $fname = __METHOD__ ) {
 889                 $table = $this->tableName( $table );
 890                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 891                 $owner = $this->addQuotes( strtoupper( $this->mDBname ) );
 892                 $SQL = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 893                 $res = $this->doQuery( $SQL );
 894                 if ( $res ) {
 895                         $count = $res->numRows();
 896                         $res->free();
 897                 } else {
 898                         $count = 0;
 899                 }
 900                 return $count;
 901         }
 902
 903         /**
 904          * Function translates mysql_fetch_field() functionality on ORACLE.
 905          * Caching is present for reducing query time.
 906          * For internal calls. Use fieldInfo for normal usage.
 907          * Returns false if the field doesn't exist
 908          *
 909          * @param $table Array
 910          * @param $field String
 911          * @return ORAField|ORAResult
 912          */
 913         private function fieldInfoMulti( $table, $field ) {
 914                 $field = strtoupper( $field );
 915                 if ( is_array( $table ) ) {
 916                         $table = array_map( array( &$this, 'tableNameInternal' ), $table );
 917                         $tableWhere = 'IN (';
 918                         foreach ( $table as &$singleTable ) {
 919                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
 920                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 921                                         return $this->mFieldInfoCache["$singleTable.$field"];
 922                                 }
 923                                 $tableWhere .= '\'' . $singleTable . '\',';
 924                         }
 925                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 926                 } else {
 927                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
 928                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 929                                 return $this->mFieldInfoCache["$table.$field"];
 930                         }
 931                         $tableWhere = '= \'' . $table . '\'';
 932                 }
 933
 934                 $fieldInfoStmt = oci_parse( $this->mConn, 'SELECT * FROM wiki_field_info_full WHERE table_name ' . $tableWhere . ' and column_name = \'' . $field . '\'' );
 935                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 936                         $e = oci_error( $fieldInfoStmt );
 937                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 938                         return false;
 939                 }
 940                 $res = new ORAResult( $this, $fieldInfoStmt );
 941                 if ( $res->numRows() == 0 ) {
 942                         if ( is_array( $table ) ) {
 943                                 foreach ( $table as &$singleTable ) {
 944                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 945                                 }
 946                         } else {
 947                                 $this->mFieldInfoCache["$table.$field"] = false;
 948                         }
 949                         $fieldInfoTemp = null;
 950                 } else {
 951                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 952                         $table = $fieldInfoTemp->tableName();
 953                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 954                 }
 955                 $res->free();
 956                 return $fieldInfoTemp;
 957         }
 958
 959         /**
 960          * @throws DBUnexpectedError
 961          * @param  $table
 962          * @param  $field
 963          * @return ORAField
 964          */
 965         function fieldInfo( $table, $field ) {
 966                 if ( is_array( $table ) ) {
 967                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 968                 }
 969                 return $this->fieldInfoMulti( $table, $field );
 970         }
 971
 972         protected function doBegin( $fname = __METHOD__ ) {
 973                 $this->mTrxLevel = 1;
 974                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 975         }
 976
 977         protected function doCommit( $fname = __METHOD__ ) {
 978                 if ( $this->mTrxLevel ) {
 979                         $ret = oci_commit( $this->mConn );
 980                         if ( !$ret ) {
 981                                 throw new DBUnexpectedError( $this, $this->lastError() );
 982                         }
 983                         $this->mTrxLevel = 0;
 984                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 985                 }
 986         }
 987
 988         protected function doRollback( $fname = __METHOD__ ) {
 989                 if ( $this->mTrxLevel ) {
 990                         oci_rollback( $this->mConn );
 991                         $this->mTrxLevel = 0;
 992                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 993                 }
 994         }
 995
 996         /* defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}'; */
 997         function sourceStream( $fp, $lineCallback = false, $resultCallback = false,
 998                 $fname = __METHOD__, $inputCallback = false ) {
 999                 $cmd = '';
1000                 $done = false;
1001                 $dollarquote = false;
1002
1003                 $replacements = array();
1004
1005                 while ( ! feof( $fp ) ) {
1006                         if ( $lineCallback ) {
1007                                 call_user_func( $lineCallback );
1008                         }
1009                         $line = trim( fgets( $fp, 1024 ) );
1010                         $sl = strlen( $line ) - 1;
1011
1012                         if ( $sl < 0 ) {
1013                                 continue;
1014                         }
1015                         if ( '-' == $line { 0 } && '-' == $line { 1 } ) {
1016                                 continue;
1017                         }
1018
1019                         // Allow dollar quoting for function declarations
1020                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
1021                                 if ( $dollarquote ) {
1022                                         $dollarquote = false;
1023                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
1024                                         $done = true;
1025                                 } else {
1026                                         $dollarquote = true;
1027                                 }
1028                         } elseif ( !$dollarquote ) {
1029                                 if ( ';' == $line { $sl } && ( $sl < 2 || ';' != $line { $sl - 1 } ) ) {
1030                                         $done = true;
1031                                         $line = substr( $line, 0, $sl );
1032                                 }
1033                         }
1034
1035                         if ( $cmd != '' ) {
1036                                 $cmd .= ' ';
1037                         }
1038                         $cmd .= "$line\n";
1039
1040                         if ( $done ) {
1041                                 $cmd = str_replace( ';;', ";", $cmd );
1042                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1043                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1044                                                 $replacements[$defines[2]] = $defines[1];
1045                                         }
1046                                 } else {
1047                                         foreach ( $replacements as $mwVar => $scVar ) {
1048                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1049                                         }
1050
1051                                         $cmd = $this->replaceVars( $cmd );
1052                                         if ( $inputCallback ) {
1053                                                 call_user_func( $inputCallback, $cmd );
1054                                         }
1055                                         $res = $this->doQuery( $cmd );
1056                                         if ( $resultCallback ) {
1057                                                 call_user_func( $resultCallback, $res, $this );
1058                                         }
1059
1060                                         if ( false === $res ) {
1061                                                 $err = $this->lastError();
1062                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1063                                         }
1064                                 }
1065
1066                                 $cmd = '';
1067                                 $done = false;
1068                         }
1069                 }
1070                 return true;
1071         }
1072
1073         function selectDB( $db ) {
1074                 $this->mDBname = $db;
1075                 if ( $db == null || $db == $this->mUser ) {
1076                         return true;
1077                 }
1078                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper( $db );
1079                 $stmt = oci_parse( $this->mConn, $sql );
1080                 wfSuppressWarnings();
1081                 $success = oci_execute( $stmt );
1082                 wfRestoreWarnings();
1083                 if ( !$success ) {
1084                         $e = oci_error( $stmt );
1085                         if ( $e['code'] != '1435' ) {
1086                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1087                         }
1088                         return false;
1089                 }
1090                 return true;
1091         }
1092
1093         function strencode( $s ) {
1094                 return str_replace( "'", "''", $s );
1095         }
1096
1097         function addQuotes( $s ) {
1098                 global $wgContLang;
1099                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1100                         $s = $wgContLang->checkTitleEncoding( $s );
1101                 }
1102                 return "'" . $this->strencode( $s ) . "'";
1103         }
1104
1105         public function addIdentifierQuotes( $s ) {
1106                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1107                         $s = '/*Q*/' . $s;
1108                 }
1109                 return $s;
1110         }
1111
1112         public function removeIdentifierQuotes( $s ) {
1113                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1114         }
1115
1116         public function isQuotedIdentifier( $s ) {
1117                 return strpos( $s, '/*Q*/' ) !== false;
1118         }
1119
1120         private function wrapFieldForWhere( $table, &$col, &$val ) {
1121                 global $wgContLang;
1122
1123                 $col_info = $this->fieldInfoMulti( $table, $col );
1124                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1125                 if ( $col_type == 'CLOB' ) {
1126                         $col = 'TO_CHAR(' . $col . ')';
1127                         $val = $wgContLang->checkTitleEncoding( $val );
1128                 } elseif ( $col_type == 'VARCHAR2' ) {
1129                         $val = $wgContLang->checkTitleEncoding( $val );
1130                 }
1131         }
1132
1133         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1134                 $conds2 = array();
1135                 foreach ( $conds as $col => $val ) {
1136                         if ( is_array( $val ) ) {
1137                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1138                         } else {
1139                                 if ( is_numeric( $col ) && $parentCol != null ) {
1140                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1141                                 } else {
1142                                         $this->wrapFieldForWhere( $table, $col, $val );
1143                                 }
1144                                 $conds2[$col] = $val;
1145                         }
1146                 }
1147                 return $conds2;
1148         }
1149
1150         function selectRow( $table, $vars, $conds, $fname = __METHOD__, $options = array(), $join_conds = array() ) {
1151                 if ( is_array( $conds ) ) {
1152                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1153                 }
1154                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1155         }
1156
1157         /**
1158          * Returns an optional USE INDEX clause to go after the table, and a
1159          * string to go at the end of the query
1160          *
1161          * @private
1162          *
1163          * @param array $options an associative array of options to be turned into
1164          *              an SQL query, valid keys are listed in the function.
1165          * @return array
1166          */
1167         function makeSelectOptions( $options ) {
1168                 $preLimitTail = $postLimitTail = '';
1169                 $startOpts = '';
1170
1171                 $noKeyOptions = array();
1172                 foreach ( $options as $key => $option ) {
1173                         if ( is_numeric( $key ) ) {
1174                                 $noKeyOptions[$option] = true;
1175                         }
1176                 }
1177
1178                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1179
1180                 $preLimitTail .= $this->makeOrderBy( $options );
1181
1182                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1183                         $postLimitTail .= ' FOR UPDATE';
1184                 }
1185
1186                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1187                         $startOpts .= 'DISTINCT';
1188                 }
1189
1190                 if ( isset( $options['USE INDEX'] ) && ! is_array( $options['USE INDEX'] ) ) {
1191                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1192                 } else {
1193                         $useIndex = '';
1194                 }
1195
1196                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1197         }
1198
1199         public function delete( $table, $conds, $fname = __METHOD__ ) {
1200                 if ( is_array( $conds ) ) {
1201                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1202                 }
1203                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1204                 // all deletions on these tables have transactions so final failure rollbacks these updates
1205                 $table = $this->tableName( $table );
1206                 if ( $table == $this->tableName( 'user' ) ) {
1207                                 $this->update( 'archive', array( 'ar_user' => 0 ), array( 'ar_user' => $conds['user_id'] ), $fname );
1208                                 $this->update( 'ipblocks', array( 'ipb_user' => 0 ), array( 'ipb_user' => $conds['user_id'] ), $fname );
1209                                 $this->update( 'image', array( 'img_user' => 0 ), array( 'img_user' => $conds['user_id'] ), $fname );
1210                                 $this->update( 'oldimage', array( 'oi_user' => 0 ), array( 'oi_user' => $conds['user_id'] ), $fname );
1211                                 $this->update( 'filearchive', array( 'fa_deleted_user' => 0 ), array( 'fa_deleted_user' => $conds['user_id'] ), $fname );
1212                                 $this->update( 'filearchive', array( 'fa_user' => 0 ), array( 'fa_user' => $conds['user_id'] ), $fname );
1213                                 $this->update( 'uploadstash', array( 'us_user' => 0 ), array( 'us_user' => $conds['user_id'] ), $fname );
1214                                 $this->update( 'recentchanges', array( 'rc_user' => 0 ), array( 'rc_user' => $conds['user_id'] ), $fname );
1215                                 $this->update( 'logging', array( 'log_user' => 0 ), array( 'log_user' => $conds['user_id'] ), $fname );
1216                 } elseif ( $table == $this->tableName( 'image' ) ) {
1217                                 $this->update( 'oldimage', array( 'oi_name' => 0 ), array( 'oi_name' => $conds['img_name'] ), $fname );
1218                 }
1219                 return parent::delete( $table, $conds, $fname );
1220         }
1221
1222         function update( $table, $values, $conds, $fname = __METHOD__, $options = array() ) {
1223                 global $wgContLang;
1224
1225                 $table = $this->tableName( $table );
1226                 $opts = $this->makeUpdateOptions( $options );
1227                 $sql = "UPDATE $opts $table SET ";
1228
1229                 $first = true;
1230                 foreach ( $values as $col => &$val ) {
1231                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1232
1233                         if ( !$first ) {
1234                                 $sqlSet = ', ' . $sqlSet;
1235                         } else {
1236                                 $first = false;
1237                         }
1238                         $sql .= $sqlSet;
1239                 }
1240
1241                 if ( $conds !== array() && $conds !== '*' ) {
1242                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1243                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1244                 }
1245
1246                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
1247                         $e = oci_error( $this->mConn );
1248                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1249                         return false;
1250                 }
1251                 foreach ( $values as $col => &$val ) {
1252                         $col_info = $this->fieldInfoMulti( $table, $col );
1253                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1254
1255                         if ( $val === null ) {
1256                                 // do nothing ... null was inserted in statement creation
1257                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1258                                 if ( is_object( $val ) ) {
1259                                         $val = $val->getData();
1260                                 }
1261
1262                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1263                                         $val = '31-12-2030 12:00:00.000000';
1264                                 }
1265
1266                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1267                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1268                                         $e = oci_error( $stmt );
1269                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1270                                         return false;
1271                                 }
1272                         } else {
1273                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
1274                                         $e = oci_error( $stmt );
1275                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1276                                 }
1277
1278                                 if ( $col_type == 'BLOB' ) {
1279                                         $lob[$col]->writeTemporary( $val );
1280                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, SQLT_BLOB );
1281                                 } else {
1282                                         $lob[$col]->writeTemporary( $val );
1283                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], - 1, OCI_B_CLOB );
1284                                 }
1285                         }
1286                 }
1287
1288                 wfSuppressWarnings();
1289
1290                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1291                         $e = oci_error( $stmt );
1292                         if ( !$this->ignore_DUP_VAL_ON_INDEX || $e['code'] != '1' ) {
1293                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1294                                 return false;
1295                         } else {
1296                                 $this->mAffectedRows = oci_num_rows( $stmt );
1297                         }
1298                 } else {
1299                         $this->mAffectedRows = oci_num_rows( $stmt );
1300                 }
1301
1302                 wfRestoreWarnings();
1303
1304                 if ( isset( $lob ) ) {
1305                         foreach ( $lob as $lob_v ) {
1306                                 $lob_v->free();
1307                         }
1308                 }
1309
1310                 if ( !$this->mTrxLevel ) {
1311                         oci_commit( $this->mConn );
1312                 }
1313
1314                 oci_free_statement( $stmt );
1315         }
1316
1317         function bitNot( $field ) {
1318                 // expecting bit-fields smaller than 4bytes
1319                 return 'BITNOT(' . $field . ')';
1320         }
1321
1322         function bitAnd( $fieldLeft, $fieldRight ) {
1323                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1324         }
1325
1326         function bitOr( $fieldLeft, $fieldRight ) {
1327                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1328         }
1329
1330         function setFakeMaster( $enabled = true ) {
1331         }
1332
1333         function getDBname() {
1334                 return $this->mDBname;
1335         }
1336
1337         function getServer() {
1338                 return $this->mServer;
1339         }
1340
1341         public function getSearchEngine() {
1342                 return 'SearchOracle';
1343         }
1344
1345         public function getInfinity() {
1346                 return '31-12-2030 12:00:00.000000';
1347         }
1348
1349 } // end DatabaseOracle class