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 DatabaseBase $db
  54          * @param resource $stmt A valid OCI statement identifier
  55          * @param bool $unique
  56          */
  57         function __construct( &$db, $stmt, $unique = false ) {
  58                 $this->db =& $db;
  59
  60                 $this->nrows = oci_fetch_all( $stmt, $this->rows, 0, -1, OCI_FETCHSTATEMENT_BY_ROW | OCI_NUM );
  61                 if ( $this->nrows === false ) {
  62                         $e = oci_error( $stmt );
  63                         $db->reportQueryError( $e['message'], $e['code'], '', __METHOD__ );
  64                         $this->free();
  65
  66                         return;
  67                 }
  68
  69                 if ( $unique ) {
  70                         $this->rows = $this->array_unique_md( $this->rows );
  71                         $this->nrows = count( $this->rows );
  72                 }
  73
  74                 if ( $this->nrows > 0 ) {
  75                         foreach ( $this->rows[0] as $k => $v ) {
  76                                 $this->columns[$k] = strtolower( oci_field_name( $stmt, $k + 1 ) );
  77                         }
  78                 }
  79
  80                 $this->cursor = 0;
  81                 oci_free_statement( $stmt );
  82         }
  83
  84         public function free() {
  85                 unset( $this->db );
  86         }
  87
  88         public function seek( $row ) {
  89                 $this->cursor = min( $row, $this->nrows );
  90         }
  91
  92         public function numRows() {
  93                 return $this->nrows;
  94         }
  95
  96         public function numFields() {
  97                 return count( $this->columns );
  98         }
  99
 100         public function fetchObject() {
 101                 if ( $this->cursor >= $this->nrows ) {
 102                         return false;
 103                 }
 104                 $row = $this->rows[$this->cursor++];
 105                 $ret = new stdClass();
 106                 foreach ( $row as $k => $v ) {
 107                         $lc = $this->columns[$k];
 108                         $ret->$lc = $v;
 109                 }
 110
 111                 return $ret;
 112         }
 113
 114         public function fetchRow() {
 115                 if ( $this->cursor >= $this->nrows ) {
 116                         return false;
 117                 }
 118
 119                 $row = $this->rows[$this->cursor++];
 120                 $ret = array();
 121                 foreach ( $row as $k => $v ) {
 122                         $lc = $this->columns[$k];
 123                         $ret[$lc] = $v;
 124                         $ret[$k] = $v;
 125                 }
 126
 127                 return $ret;
 128         }
 129 }
 130
 131 /**
 132  * Utility class.
 133  * @ingroup Database
 134  */
 135 class ORAField implements Field {
 136         private $name, $tablename, $default, $max_length, $nullable,
 137                 $is_pk, $is_unique, $is_multiple, $is_key, $type;
 138
 139         function __construct( $info ) {
 140                 $this->name = $info['column_name'];
 141                 $this->tablename = $info['table_name'];
 142                 $this->default = $info['data_default'];
 143                 $this->max_length = $info['data_length'];
 144                 $this->nullable = $info['not_null'];
 145                 $this->is_pk = isset( $info['prim'] ) && $info['prim'] == 1 ? 1 : 0;
 146                 $this->is_unique = isset( $info['uniq'] ) && $info['uniq'] == 1 ? 1 : 0;
 147                 $this->is_multiple = isset( $info['nonuniq'] ) && $info['nonuniq'] == 1 ? 1 : 0;
 148                 $this->is_key = ( $this->is_pk || $this->is_unique || $this->is_multiple );
 149                 $this->type = $info['data_type'];
 150         }
 151
 152         function name() {
 153                 return $this->name;
 154         }
 155
 156         function tableName() {
 157                 return $this->tablename;
 158         }
 159
 160         function defaultValue() {
 161                 return $this->default;
 162         }
 163
 164         function maxLength() {
 165                 return $this->max_length;
 166         }
 167
 168         function isNullable() {
 169                 return $this->nullable;
 170         }
 171
 172         function isKey() {
 173                 return $this->is_key;
 174         }
 175
 176         function isMultipleKey() {
 177                 return $this->is_multiple;
 178         }
 179
 180         function type() {
 181                 return $this->type;
 182         }
 183 }
 184
 185 /**
 186  * @ingroup Database
 187  */
 188 class DatabaseOracle extends DatabaseBase {
 189         /** @var resource */
 190         protected $mLastResult = null;
 191
 192         /** @var int The number of rows affected as an integer */
 193         protected $mAffectedRows;
 194
 195         /** @var int */
 196         private $mInsertId = null;
 197
 198         /** @var bool */
 199         private $ignoreDupValOnIndex = false;
 200
 201         /** @var bool|array */
 202         private $sequenceData = null;
 203
 204         /** @var string Character set for Oracle database */
 205         private $defaultCharset = 'AL32UTF8';
 206
 207         /** @var array */
 208         private $mFieldInfoCache = array();
 209
 210         function __construct( $p = null ) {
 211                 global $wgDBprefix;
 212
 213                 if ( !is_array( $p ) ) { // legacy calling pattern
 214                         wfDeprecated( __METHOD__ . " method called without parameter array.", "1.22" );
 215                         $args = func_get_args();
 216                         $p = array(
 217                                 'host' => isset( $args[0] ) ? $args[0] : false,
 218                                 'user' => isset( $args[1] ) ? $args[1] : false,
 219                                 'password' => isset( $args[2] ) ? $args[2] : false,
 220                                 'dbname' => isset( $args[3] ) ? $args[3] : false,
 221                                 'flags' => isset( $args[4] ) ? $args[4] : 0,
 222                                 'tablePrefix' => isset( $args[5] ) ? $args[5] : 'get from global',
 223                                 'schema' => 'get from global',
 224                                 'foreign' => isset( $args[6] ) ? $args[6] : false
 225                         );
 226                 }
 227                 if ( $p['tablePrefix'] == 'get from global' ) {
 228                         $p['tablePrefix'] = $wgDBprefix;
 229                 }
 230                 $p['tablePrefix'] = strtoupper( $p['tablePrefix'] );
 231                 parent::__construct( $p );
 232                 Hooks::run( 'DatabaseOraclePostInit', array( $this ) );
 233         }
 234
 235         function __destruct() {
 236                 if ( $this->mOpened ) {
 237                         wfSuppressWarnings();
 238                         $this->close();
 239                         wfRestoreWarnings();
 240                 }
 241         }
 242
 243         function getType() {
 244                 return 'oracle';
 245         }
 246
 247         function cascadingDeletes() {
 248                 return true;
 249         }
 250
 251         function cleanupTriggers() {
 252                 return true;
 253         }
 254
 255         function strictIPs() {
 256                 return true;
 257         }
 258
 259         function realTimestamps() {
 260                 return true;
 261         }
 262
 263         function implicitGroupby() {
 264                 return false;
 265         }
 266
 267         function implicitOrderby() {
 268                 return false;
 269         }
 270
 271         function searchableIPs() {
 272                 return true;
 273         }
 274
 275         /**
 276          * Usually aborts on failure
 277          * @param string $server
 278          * @param string $user
 279          * @param string $password
 280          * @param string $dbName
 281          * @throws DBConnectionError
 282          * @return DatabaseBase|null
 283          */
 284         function open( $server, $user, $password, $dbName ) {
 285                 global $wgDBOracleDRCP;
 286                 if ( !function_exists( 'oci_connect' ) ) {
 287                         throw new DBConnectionError(
 288                                 $this,
 289                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
 290                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
 291                                         "and database)\n" );
 292                 }
 293
 294                 $this->close();
 295                 $this->mUser = $user;
 296                 $this->mPassword = $password;
 297                 // changed internal variables functions
 298                 // mServer now holds the TNS endpoint
 299                 // mDBname is schema name if different from username
 300                 if ( !$server ) {
 301                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 302                         $this->mServer = $dbName;
 303                         $this->mDBname = $user;
 304                 } else {
 305                         $this->mServer = $server;
 306                         if ( !$dbName ) {
 307                                 $this->mDBname = $user;
 308                         } else {
 309                                 $this->mDBname = $dbName;
 310                         }
 311                 }
 312
 313                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 314                         return null;
 315                 }
 316
 317                 if ( $wgDBOracleDRCP ) {
 318                         $this->setFlag( DBO_PERSISTENT );
 319                 }
 320
 321                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 322
 323                 wfSuppressWarnings();
 324                 if ( $this->mFlags & DBO_PERSISTENT ) {
 325                         $this->mConn = oci_pconnect(
 326                                 $this->mUser,
 327                                 $this->mPassword,
 328                                 $this->mServer,
 329                                 $this->defaultCharset,
 330                                 $session_mode
 331                         );
 332                 } elseif ( $this->mFlags & DBO_DEFAULT ) {
 333                         $this->mConn = oci_new_connect(
 334                                 $this->mUser,
 335                                 $this->mPassword,
 336                                 $this->mServer,
 337                                 $this->defaultCharset,
 338                                 $session_mode
 339                         );
 340                 } else {
 341                         $this->mConn = oci_connect(
 342                                 $this->mUser,
 343                                 $this->mPassword,
 344                                 $this->mServer,
 345                                 $this->defaultCharset,
 346                                 $session_mode
 347                         );
 348                 }
 349                 wfRestoreWarnings();
 350
 351                 if ( $this->mUser != $this->mDBname ) {
 352                         //change current schema in session
 353                         $this->selectDB( $this->mDBname );
 354                 }
 355
 356                 if ( !$this->mConn ) {
 357                         throw new DBConnectionError( $this, $this->lastError() );
 358                 }
 359
 360                 $this->mOpened = true;
 361
 362                 # removed putenv calls because they interfere with the system globaly
 363                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 364                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 365                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 366
 367                 return $this->mConn;
 368         }
 369
 370         /**
 371          * Closes a database connection, if it is open
 372          * Returns success, true if already closed
 373          * @return bool
 374          */
 375         protected function closeConnection() {
 376                 return oci_close( $this->mConn );
 377         }
 378
 379         function execFlags() {
 380                 return $this->mTrxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 381         }
 382
 383         protected function doQuery( $sql ) {
 384                 wfDebug( "SQL: [$sql]\n" );
 385                 if ( !StringUtils::isUtf8( $sql ) ) {
 386                         throw new MWException( "SQL encoding is invalid\n$sql" );
 387                 }
 388
 389                 // handle some oracle specifics
 390                 // remove AS column/table/subquery namings
 391                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 392                         $sql = preg_replace( '/ as /i', ' ', $sql );
 393                 }
 394
 395                 // Oracle has issues with UNION clause if the statement includes LOB fields
 396                 // So we do a UNION ALL and then filter the results array with array_unique
 397                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 398                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 399                 // you have to select data from plan table after explain
 400                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 401
 402                 $sql = preg_replace(
 403                         '/^EXPLAIN /',
 404                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 405                         $sql,
 406                         1,
 407                         $explain_count
 408                 );
 409
 410                 wfSuppressWarnings();
 411
 412                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 413                         $e = oci_error( $this->mConn );
 414                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 415
 416                         return false;
 417                 }
 418
 419                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 420                         $e = oci_error( $stmt );
 421                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 422                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 423
 424                                 return false;
 425                         }
 426                 }
 427
 428                 wfRestoreWarnings();
 429
 430                 if ( $explain_count > 0 ) {
 431                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 432                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 433                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 434                         return new ORAResult( $this, $stmt, $union_unique );
 435                 } else {
 436                         $this->mAffectedRows = oci_num_rows( $stmt );
 437
 438                         return true;
 439                 }
 440         }
 441
 442         function queryIgnore( $sql, $fname = '' ) {
 443                 return $this->query( $sql, $fname, true );
 444         }
 445
 446         /**
 447          * Frees resources associated with the LOB descriptor
 448          * @param ResultWrapper|resource $res
 449          */
 450         function freeResult( $res ) {
 451                 if ( $res instanceof ResultWrapper ) {
 452                         $res = $res->result;
 453                 }
 454
 455                 $res->free();
 456         }
 457
 458         /**
 459          * @param ResultWrapper|stdClass $res
 460          * @return mixed
 461          */
 462         function fetchObject( $res ) {
 463                 if ( $res instanceof ResultWrapper ) {
 464                         $res = $res->result;
 465                 }
 466
 467                 return $res->fetchObject();
 468         }
 469
 470         function fetchRow( $res ) {
 471                 if ( $res instanceof ResultWrapper ) {
 472                         $res = $res->result;
 473                 }
 474
 475                 return $res->fetchRow();
 476         }
 477
 478         function numRows( $res ) {
 479                 if ( $res instanceof ResultWrapper ) {
 480                         $res = $res->result;
 481                 }
 482
 483                 return $res->numRows();
 484         }
 485
 486         function numFields( $res ) {
 487                 if ( $res instanceof ResultWrapper ) {
 488                         $res = $res->result;
 489                 }
 490
 491                 return $res->numFields();
 492         }
 493
 494         function fieldName( $stmt, $n ) {
 495                 return oci_field_name( $stmt, $n );
 496         }
 497
 498         /**
 499          * This must be called after nextSequenceVal
 500          * @return null|int
 501          */
 502         function insertId() {
 503                 return $this->mInsertId;
 504         }
 505
 506         /**
 507          * @param mixed $res
 508          * @param int $row
 509          */
 510         function dataSeek( $res, $row ) {
 511                 if ( $res instanceof ORAResult ) {
 512                         $res->seek( $row );
 513                 } else {
 514                         $res->result->seek( $row );
 515                 }
 516         }
 517
 518         function lastError() {
 519                 if ( $this->mConn === false ) {
 520                         $e = oci_error();
 521                 } else {
 522                         $e = oci_error( $this->mConn );
 523                 }
 524
 525                 return $e['message'];
 526         }
 527
 528         function lastErrno() {
 529                 if ( $this->mConn === false ) {
 530                         $e = oci_error();
 531                 } else {
 532                         $e = oci_error( $this->mConn );
 533                 }
 534
 535                 return $e['code'];
 536         }
 537
 538         function affectedRows() {
 539                 return $this->mAffectedRows;
 540         }
 541
 542         /**
 543          * Returns information about an index
 544          * If errors are explicitly ignored, returns NULL on failure
 545          * @param string $table
 546          * @param string $index
 547          * @param string $fname
 548          * @return bool
 549          */
 550         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 551                 return false;
 552         }
 553
 554         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 555                 return false;
 556         }
 557
 558         function insert( $table, $a, $fname = __METHOD__, $options = array() ) {
 559                 if ( !count( $a ) ) {
 560                         return true;
 561                 }
 562
 563                 if ( !is_array( $options ) ) {
 564                         $options = array( $options );
 565                 }
 566
 567                 if ( in_array( 'IGNORE', $options ) ) {
 568                         $this->ignoreDupValOnIndex = true;
 569                 }
 570
 571                 if ( !is_array( reset( $a ) ) ) {
 572                         $a = array( $a );
 573                 }
 574
 575                 foreach ( $a as &$row ) {
 576                         $this->insertOneRow( $table, $row, $fname );
 577                 }
 578                 $retVal = true;
 579
 580                 if ( in_array( 'IGNORE', $options ) ) {
 581                         $this->ignoreDupValOnIndex = false;
 582                 }
 583
 584                 return $retVal;
 585         }
 586
 587         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 588                 $col_info = $this->fieldInfoMulti( $table, $col );
 589                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 590
 591                 $bind = '';
 592                 if ( is_numeric( $col ) ) {
 593                         $bind = $val;
 594                         $val = null;
 595
 596                         return $bind;
 597                 } elseif ( $includeCol ) {
 598                         $bind = "$col = ";
 599                 }
 600
 601                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 602                         $val = null;
 603                 }
 604
 605                 if ( $val === 'NULL' ) {
 606                         $val = null;
 607                 }
 608
 609                 if ( $val === null ) {
 610                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 611                                 $bind .= 'DEFAULT';
 612                         } else {
 613                                 $bind .= 'NULL';
 614                         }
 615                 } else {
 616                         $bind .= ':' . $col;
 617                 }
 618
 619                 return $bind;
 620         }
 621
 622         /**
 623          * @param string $table
 624          * @param array $row
 625          * @param string $fname
 626          * @return bool
 627          * @throws DBUnexpectedError
 628          */
 629         private function insertOneRow( $table, $row, $fname ) {
 630                 global $wgContLang;
 631
 632                 $table = $this->tableName( $table );
 633                 // "INSERT INTO tables (a, b, c)"
 634                 $sql = "INSERT INTO " . $table . " (" . join( ',', array_keys( $row ) ) . ')';
 635                 $sql .= " VALUES (";
 636
 637                 // for each value, append ":key"
 638                 $first = true;
 639                 foreach ( $row as $col => &$val ) {
 640                         if ( !$first ) {
 641                                 $sql .= ', ';
 642                         } else {
 643                                 $first = false;
 644                         }
 645                         if ( $this->isQuotedIdentifier( $val ) ) {
 646                                 $sql .= $this->removeIdentifierQuotes( $val );
 647                                 unset( $row[$col] );
 648                         } else {
 649                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 650                         }
 651                 }
 652                 $sql .= ')';
 653
 654                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 655                         $e = oci_error( $this->mConn );
 656                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 657
 658                         return false;
 659                 }
 660                 foreach ( $row as $col => &$val ) {
 661                         $col_info = $this->fieldInfoMulti( $table, $col );
 662                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 663
 664                         if ( $val === null ) {
 665                                 // do nothing ... null was inserted in statement creation
 666                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 667                                 if ( is_object( $val ) ) {
 668                                         $val = $val->fetch();
 669                                 }
 670
 671                                 // backward compatibility
 672                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 673                                         $val = $this->getInfinity();
 674                                 }
 675
 676                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 677                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 678                                         $e = oci_error( $stmt );
 679                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 680
 681                                         return false;
 682                                 }
 683                         } else {
 684                                 /** @var OCI_Lob[] $lob */
 685                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
 686                                         $e = oci_error( $stmt );
 687                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 688                                 }
 689
 690                                 if ( is_object( $val ) ) {
 691                                         $val = $val->fetch();
 692                                 }
 693
 694                                 if ( $col_type == 'BLOB' ) {
 695                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 696                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 697                                 } else {
 698                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 699                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 700                                 }
 701                         }
 702                 }
 703
 704                 wfSuppressWarnings();
 705
 706                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 707                         $e = oci_error( $stmt );
 708                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 709                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 710
 711                                 return false;
 712                         } else {
 713                                 $this->mAffectedRows = oci_num_rows( $stmt );
 714                         }
 715                 } else {
 716                         $this->mAffectedRows = oci_num_rows( $stmt );
 717                 }
 718
 719                 wfRestoreWarnings();
 720
 721                 if ( isset( $lob ) ) {
 722                         foreach ( $lob as $lob_v ) {
 723                                 $lob_v->free();
 724                         }
 725                 }
 726
 727                 if ( !$this->mTrxLevel ) {
 728                         oci_commit( $this->mConn );
 729                 }
 730
 731                 return oci_free_statement( $stmt );
 732         }
 733
 734         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 735                 $insertOptions = array(), $selectOptions = array()
 736         ) {
 737                 $destTable = $this->tableName( $destTable );
 738                 if ( !is_array( $selectOptions ) ) {
 739                         $selectOptions = array( $selectOptions );
 740                 }
 741                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 742                 if ( is_array( $srcTable ) ) {
 743                         $srcTable = implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 744                 } else {
 745                         $srcTable = $this->tableName( $srcTable );
 746                 }
 747
 748                 if ( ( $sequenceData = $this->getSequenceData( $destTable ) ) !== false &&
 749                         !isset( $varMap[$sequenceData['column']] )
 750                 ) {
 751                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 752                 }
 753
 754                 // count-alias subselect fields to avoid abigious definition errors
 755                 $i = 0;
 756                 foreach ( $varMap as &$val ) {
 757                         $val = $val . ' field' . ( $i++ );
 758                 }
 759
 760                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 761                         " SELECT $startOpts " . implode( ',', $varMap ) .
 762                         " FROM $srcTable $useIndex ";
 763                 if ( $conds != '*' ) {
 764                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 765                 }
 766                 $sql .= " $tailOpts";
 767
 768                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 769                         $this->ignoreDupValOnIndex = true;
 770                 }
 771
 772                 $retval = $this->query( $sql, $fname );
 773
 774                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 775                         $this->ignoreDupValOnIndex = false;
 776                 }
 777
 778                 return $retval;
 779         }
 780
 781         public function upsert( $table, array $rows, array $uniqueIndexes, array $set,
 782                 $fname = __METHOD__
 783         ) {
 784                 if ( !count( $rows ) ) {
 785                         return true; // nothing to do
 786                 }
 787
 788                 if ( !is_array( reset( $rows ) ) ) {
 789                         $rows = array( $rows );
 790                 }
 791
 792                 $sequenceData = $this->getSequenceData( $table );
 793                 if ( $sequenceData !== false ) {
 794                         // add sequence column to each list of columns, when not set
 795                         foreach ( $rows as &$row ) {
 796                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 797                                         $row[$sequenceData['column']] =
 798                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 799                                                         $sequenceData['sequence'] . '\')' );
 800                                 }
 801                         }
 802                 }
 803
 804                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 805         }
 806
 807         function tableName( $name, $format = 'quoted' ) {
 808                 /*
 809                 Replace reserved words with better ones
 810                 Using uppercase because that's the only way Oracle can handle
 811                 quoted tablenames
 812                 */
 813                 switch ( $name ) {
 814                         case 'user':
 815                                 $name = 'MWUSER';
 816                                 break;
 817                         case 'text':
 818                                 $name = 'PAGECONTENT';
 819                                 break;
 820                 }
 821
 822                 return strtoupper( parent::tableName( $name, $format ) );
 823         }
 824
 825         function tableNameInternal( $name ) {
 826                 $name = $this->tableName( $name );
 827
 828                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 829         }
 830
 831         /**
 832          * Return the next in a sequence, save the value for retrieval via insertId()
 833          *
 834          * @param string $seqName
 835          * @return null|int
 836          */
 837         function nextSequenceValue( $seqName ) {
 838                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 839                 $row = $this->fetchRow( $res );
 840                 $this->mInsertId = $row[0];
 841
 842                 return $this->mInsertId;
 843         }
 844
 845         /**
 846          * Return sequence_name if table has a sequence
 847          *
 848          * @param string $table
 849          * @return bool
 850          */
 851         private function getSequenceData( $table ) {
 852                 if ( $this->sequenceData == null ) {
 853                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 854                                 lower(atc.table_name),
 855                                 lower(atc.column_name)
 856                         FROM all_sequences asq, all_tab_columns atc
 857                         WHERE decode(
 858                                         atc.table_name,
 859                                         '{$this->mTablePrefix}MWUSER',
 860                                         '{$this->mTablePrefix}USER',
 861                                         atc.table_name
 862                                 ) || '_' ||
 863                                 atc.column_name || '_SEQ' = '{$this->mTablePrefix}' || asq.sequence_name
 864                                 AND asq.sequence_owner = upper('{$this->mDBname}')
 865                                 AND atc.owner = upper('{$this->mDBname}')" );
 866
 867                         while ( ( $row = $result->fetchRow() ) !== false ) {
 868                                 $this->sequenceData[$row[1]] = array(
 869                                         'sequence' => $row[0],
 870                                         'column' => $row[2]
 871                                 );
 872                         }
 873                 }
 874                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 875
 876                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 877         }
 878
 879         /**
 880          * Returns the size of a text field, or -1 for "unlimited"
 881          *
 882          * @param string $table
 883          * @param string $field
 884          * @return mixed
 885          */
 886         function textFieldSize( $table, $field ) {
 887                 $fieldInfoData = $this->fieldInfo( $table, $field );
 888
 889                 return $fieldInfoData->maxLength();
 890         }
 891
 892         function limitResult( $sql, $limit, $offset = false ) {
 893                 if ( $offset === false ) {
 894                         $offset = 0;
 895                 }
 896
 897                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 898         }
 899
 900         function encodeBlob( $b ) {
 901                 return new Blob( $b );
 902         }
 903
 904         function decodeBlob( $b ) {
 905                 if ( $b instanceof Blob ) {
 906                         $b = $b->fetch();
 907                 }
 908
 909                 return $b;
 910         }
 911
 912         function unionQueries( $sqls, $all ) {
 913                 $glue = ' UNION ALL ';
 914
 915                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 916                         'FROM (' . implode( $glue, $sqls ) . ')';
 917         }
 918
 919         function wasDeadlock() {
 920                 return $this->lastErrno() == 'OCI-00060';
 921         }
 922
 923         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 924                 $fname = __METHOD__
 925         ) {
 926                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 927
 928                 $newName = strtoupper( $newName );
 929                 $oldName = strtoupper( $oldName );
 930
 931                 $tabName = substr( $newName, strlen( $this->mTablePrefix ) );
 932                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 933                 $newPrefix = strtoupper( $this->mTablePrefix );
 934
 935                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 936                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 937         }
 938
 939         function listTables( $prefix = null, $fname = __METHOD__ ) {
 940                 $listWhere = '';
 941                 if ( !empty( $prefix ) ) {
 942                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 943                 }
 944
 945                 $owner = strtoupper( $this->mDBname );
 946                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 947                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 948
 949                 // dirty code ... i know
 950                 $endArray = array();
 951                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 952                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 953                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 954                 $fixedOrderTabs = $endArray;
 955                 while ( ( $row = $result->fetchRow() ) !== false ) {
 956                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 957                                 $endArray[] = $row['table_name'];
 958                         }
 959                 }
 960
 961                 return $endArray;
 962         }
 963
 964         public function dropTable( $tableName, $fName = __METHOD__ ) {
 965                 $tableName = $this->tableName( $tableName );
 966                 if ( !$this->tableExists( $tableName ) ) {
 967                         return false;
 968                 }
 969
 970                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 971         }
 972
 973         function timestamp( $ts = 0 ) {
 974                 return wfTimestamp( TS_ORACLE, $ts );
 975         }
 976
 977         /**
 978          * Return aggregated value function call
 979          *
 980          * @param array $valuedata
 981          * @param string $valuename
 982          * @return mixed
 983          */
 984         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 985                 return $valuedata;
 986         }
 987
 988         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 989                 # Ignore errors during error handling to avoid infinite
 990                 # recursion
 991                 $ignore = $this->ignoreErrors( true );
 992                 ++$this->mErrorCount;
 993
 994                 if ( $ignore || $tempIgnore ) {
 995                         wfDebug( "SQL ERROR (ignored): $error\n" );
 996                         $this->ignoreErrors( $ignore );
 997                 } else {
 998                         throw new DBQueryError( $this, $error, $errno, $sql, $fname );
 999                 }
1000         }
1001
1002         /**
1003          * @return string Wikitext of a link to the server software's web site
1004          */
1005         public function getSoftwareLink() {
1006                 return '[{{int:version-db-oracle-url}} Oracle]';
1007         }
1008
1009         /**
1010          * @return string Version information from the database
1011          */
1012         function getServerVersion() {
1013                 //better version number, fallback on driver
1014                 $rset = $this->doQuery(
1015                         'SELECT version FROM product_component_version ' .
1016                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
1017                 );
1018                 if ( !( $row = $rset->fetchRow() ) ) {
1019                         return oci_server_version( $this->mConn );
1020                 }
1021
1022                 return $row['version'];
1023         }
1024
1025         /**
1026          * Query whether a given index exists
1027          * @param string $table
1028          * @param string $index
1029          * @param string $fname
1030          * @return bool
1031          */
1032         function indexExists( $table, $index, $fname = __METHOD__ ) {
1033                 $table = $this->tableName( $table );
1034                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
1035                 $index = strtoupper( $index );
1036                 $owner = strtoupper( $this->mDBname );
1037                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
1038                 $res = $this->doQuery( $sql );
1039                 if ( $res ) {
1040                         $count = $res->numRows();
1041                         $res->free();
1042                 } else {
1043                         $count = 0;
1044                 }
1045
1046                 return $count != 0;
1047         }
1048
1049         /**
1050          * Query whether a given table exists (in the given schema, or the default mw one if not given)
1051          * @param string $table
1052          * @param string $fname
1053          * @return bool
1054          */
1055         function tableExists( $table, $fname = __METHOD__ ) {
1056                 $table = $this->tableName( $table );
1057                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
1058                 $owner = $this->addQuotes( strtoupper( $this->mDBname ) );
1059                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
1060                 $res = $this->doQuery( $sql );
1061                 if ( $res && $res->numRows() > 0 ) {
1062                         $exists = true;
1063                 } else {
1064                         $exists = false;
1065                 }
1066
1067                 $res->free();
1068
1069                 return $exists;
1070         }
1071
1072         /**
1073          * Function translates mysql_fetch_field() functionality on ORACLE.
1074          * Caching is present for reducing query time.
1075          * For internal calls. Use fieldInfo for normal usage.
1076          * Returns false if the field doesn't exist
1077          *
1078          * @param array|string $table
1079          * @param string $field
1080          * @return ORAField|ORAResult
1081          */
1082         private function fieldInfoMulti( $table, $field ) {
1083                 $field = strtoupper( $field );
1084                 if ( is_array( $table ) ) {
1085                         $table = array_map( array( &$this, 'tableNameInternal' ), $table );
1086                         $tableWhere = 'IN (';
1087                         foreach ( $table as &$singleTable ) {
1088                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
1089                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
1090                                         return $this->mFieldInfoCache["$singleTable.$field"];
1091                                 }
1092                                 $tableWhere .= '\'' . $singleTable . '\',';
1093                         }
1094                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
1095                 } else {
1096                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
1097                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
1098                                 return $this->mFieldInfoCache["$table.$field"];
1099                         }
1100                         $tableWhere = '= \'' . $table . '\'';
1101                 }
1102
1103                 $fieldInfoStmt = oci_parse(
1104                         $this->mConn,
1105                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
1106                                 $tableWhere . ' and column_name = \'' . $field . '\''
1107                 );
1108                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
1109                         $e = oci_error( $fieldInfoStmt );
1110                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
1111
1112                         return false;
1113                 }
1114                 $res = new ORAResult( $this, $fieldInfoStmt );
1115                 if ( $res->numRows() == 0 ) {
1116                         if ( is_array( $table ) ) {
1117                                 foreach ( $table as &$singleTable ) {
1118                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
1119                                 }
1120                         } else {
1121                                 $this->mFieldInfoCache["$table.$field"] = false;
1122                         }
1123                         $fieldInfoTemp = null;
1124                 } else {
1125                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
1126                         $table = $fieldInfoTemp->tableName();
1127                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
1128                 }
1129                 $res->free();
1130
1131                 return $fieldInfoTemp;
1132         }
1133
1134         /**
1135          * @throws DBUnexpectedError
1136          * @param string $table
1137          * @param string $field
1138          * @return ORAField
1139          */
1140         function fieldInfo( $table, $field ) {
1141                 if ( is_array( $table ) ) {
1142                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
1143                 }
1144
1145                 return $this->fieldInfoMulti( $table, $field );
1146         }
1147
1148         protected function doBegin( $fname = __METHOD__ ) {
1149                 $this->mTrxLevel = 1;
1150                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
1151         }
1152
1153         protected function doCommit( $fname = __METHOD__ ) {
1154                 if ( $this->mTrxLevel ) {
1155                         $ret = oci_commit( $this->mConn );
1156                         if ( !$ret ) {
1157                                 throw new DBUnexpectedError( $this, $this->lastError() );
1158                         }
1159                         $this->mTrxLevel = 0;
1160                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
1161                 }
1162         }
1163
1164         protected function doRollback( $fname = __METHOD__ ) {
1165                 if ( $this->mTrxLevel ) {
1166                         oci_rollback( $this->mConn );
1167                         $this->mTrxLevel = 0;
1168                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
1169                 }
1170         }
1171
1172         /**
1173          * defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
1174          *
1175          * @param resource $fp
1176          * @param bool|string $lineCallback
1177          * @param bool|callable $resultCallback
1178          * @param string $fname
1179          * @param bool|callable $inputCallback
1180          * @return bool|string
1181          */
1182         function sourceStream( $fp, $lineCallback = false, $resultCallback = false,
1183                 $fname = __METHOD__, $inputCallback = false ) {
1184                 $cmd = '';
1185                 $done = false;
1186                 $dollarquote = false;
1187
1188                 $replacements = array();
1189
1190                 while ( !feof( $fp ) ) {
1191                         if ( $lineCallback ) {
1192                                 call_user_func( $lineCallback );
1193                         }
1194                         $line = trim( fgets( $fp, 1024 ) );
1195                         $sl = strlen( $line ) - 1;
1196
1197                         if ( $sl < 0 ) {
1198                                 continue;
1199                         }
1200                         if ( '-' == $line[0] && '-' == $line[1] ) {
1201                                 continue;
1202                         }
1203
1204                         // Allow dollar quoting for function declarations
1205                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
1206                                 if ( $dollarquote ) {
1207                                         $dollarquote = false;
1208                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
1209                                         $done = true;
1210                                 } else {
1211                                         $dollarquote = true;
1212                                 }
1213                         } elseif ( !$dollarquote ) {
1214                                 if ( ';' == $line[$sl] && ( $sl < 2 || ';' != $line[$sl - 1] ) ) {
1215                                         $done = true;
1216                                         $line = substr( $line, 0, $sl );
1217                                 }
1218                         }
1219
1220                         if ( $cmd != '' ) {
1221                                 $cmd .= ' ';
1222                         }
1223                         $cmd .= "$line\n";
1224
1225                         if ( $done ) {
1226                                 $cmd = str_replace( ';;', ";", $cmd );
1227                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1228                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1229                                                 $replacements[$defines[2]] = $defines[1];
1230                                         }
1231                                 } else {
1232                                         foreach ( $replacements as $mwVar => $scVar ) {
1233                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1234                                         }
1235
1236                                         $cmd = $this->replaceVars( $cmd );
1237                                         if ( $inputCallback ) {
1238                                                 call_user_func( $inputCallback, $cmd );
1239                                         }
1240                                         $res = $this->doQuery( $cmd );
1241                                         if ( $resultCallback ) {
1242                                                 call_user_func( $resultCallback, $res, $this );
1243                                         }
1244
1245                                         if ( false === $res ) {
1246                                                 $err = $this->lastError();
1247
1248                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1249                                         }
1250                                 }
1251
1252                                 $cmd = '';
1253                                 $done = false;
1254                         }
1255                 }
1256
1257                 return true;
1258         }
1259
1260         function selectDB( $db ) {
1261                 $this->mDBname = $db;
1262                 if ( $db == null || $db == $this->mUser ) {
1263                         return true;
1264                 }
1265                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper( $db );
1266                 $stmt = oci_parse( $this->mConn, $sql );
1267                 wfSuppressWarnings();
1268                 $success = oci_execute( $stmt );
1269                 wfRestoreWarnings();
1270                 if ( !$success ) {
1271                         $e = oci_error( $stmt );
1272                         if ( $e['code'] != '1435' ) {
1273                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1274                         }
1275
1276                         return false;
1277                 }
1278
1279                 return true;
1280         }
1281
1282         function strencode( $s ) {
1283                 return str_replace( "'", "''", $s );
1284         }
1285
1286         function addQuotes( $s ) {
1287                 global $wgContLang;
1288                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1289                         $s = $wgContLang->checkTitleEncoding( $s );
1290                 }
1291
1292                 return "'" . $this->strencode( $s ) . "'";
1293         }
1294
1295         public function addIdentifierQuotes( $s ) {
1296                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1297                         $s = '/*Q*/' . $s;
1298                 }
1299
1300                 return $s;
1301         }
1302
1303         public function removeIdentifierQuotes( $s ) {
1304                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1305         }
1306
1307         public function isQuotedIdentifier( $s ) {
1308                 return strpos( $s, '/*Q*/' ) !== false;
1309         }
1310
1311         private function wrapFieldForWhere( $table, &$col, &$val ) {
1312                 global $wgContLang;
1313
1314                 $col_info = $this->fieldInfoMulti( $table, $col );
1315                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1316                 if ( $col_type == 'CLOB' ) {
1317                         $col = 'TO_CHAR(' . $col . ')';
1318                         $val = $wgContLang->checkTitleEncoding( $val );
1319                 } elseif ( $col_type == 'VARCHAR2' ) {
1320                         $val = $wgContLang->checkTitleEncoding( $val );
1321                 }
1322         }
1323
1324         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1325                 $conds2 = array();
1326                 foreach ( $conds as $col => $val ) {
1327                         if ( is_array( $val ) ) {
1328                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1329                         } else {
1330                                 if ( is_numeric( $col ) && $parentCol != null ) {
1331                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1332                                 } else {
1333                                         $this->wrapFieldForWhere( $table, $col, $val );
1334                                 }
1335                                 $conds2[$col] = $val;
1336                         }
1337                 }
1338
1339                 return $conds2;
1340         }
1341
1342         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1343                 $options = array(), $join_conds = array()
1344         ) {
1345                 if ( is_array( $conds ) ) {
1346                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1347                 }
1348
1349                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1350         }
1351
1352         /**
1353          * Returns an optional USE INDEX clause to go after the table, and a
1354          * string to go at the end of the query
1355          *
1356          * @param array $options An associative array of options to be turned into
1357          *   an SQL query, valid keys are listed in the function.
1358          * @return array
1359          */
1360         function makeSelectOptions( $options ) {
1361                 $preLimitTail = $postLimitTail = '';
1362                 $startOpts = '';
1363
1364                 $noKeyOptions = array();
1365                 foreach ( $options as $key => $option ) {
1366                         if ( is_numeric( $key ) ) {
1367                                 $noKeyOptions[$option] = true;
1368                         }
1369                 }
1370
1371                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1372
1373                 $preLimitTail .= $this->makeOrderBy( $options );
1374
1375                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1376                         $postLimitTail .= ' FOR UPDATE';
1377                 }
1378
1379                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1380                         $startOpts .= 'DISTINCT';
1381                 }
1382
1383                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1384                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1385                 } else {
1386                         $useIndex = '';
1387                 }
1388
1389                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1390         }
1391
1392         public function delete( $table, $conds, $fname = __METHOD__ ) {
1393                 if ( is_array( $conds ) ) {
1394                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1395                 }
1396                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1397                 // all deletions on these tables have transactions so final failure rollbacks these updates
1398                 $table = $this->tableName( $table );
1399                 if ( $table == $this->tableName( 'user' ) ) {
1400                         $this->update( 'archive', array( 'ar_user' => 0 ),
1401                                 array( 'ar_user' => $conds['user_id'] ), $fname );
1402                         $this->update( 'ipblocks', array( 'ipb_user' => 0 ),
1403                                 array( 'ipb_user' => $conds['user_id'] ), $fname );
1404                         $this->update( 'image', array( 'img_user' => 0 ),
1405                                 array( 'img_user' => $conds['user_id'] ), $fname );
1406                         $this->update( 'oldimage', array( 'oi_user' => 0 ),
1407                                 array( 'oi_user' => $conds['user_id'] ), $fname );
1408                         $this->update( 'filearchive', array( 'fa_deleted_user' => 0 ),
1409                                 array( 'fa_deleted_user' => $conds['user_id'] ), $fname );
1410                         $this->update( 'filearchive', array( 'fa_user' => 0 ),
1411                                 array( 'fa_user' => $conds['user_id'] ), $fname );
1412                         $this->update( 'uploadstash', array( 'us_user' => 0 ),
1413                                 array( 'us_user' => $conds['user_id'] ), $fname );
1414                         $this->update( 'recentchanges', array( 'rc_user' => 0 ),
1415                                 array( 'rc_user' => $conds['user_id'] ), $fname );
1416                         $this->update( 'logging', array( 'log_user' => 0 ),
1417                                 array( 'log_user' => $conds['user_id'] ), $fname );
1418                 } elseif ( $table == $this->tableName( 'image' ) ) {
1419                         $this->update( 'oldimage', array( 'oi_name' => 0 ),
1420                                 array( 'oi_name' => $conds['img_name'] ), $fname );
1421                 }
1422
1423                 return parent::delete( $table, $conds, $fname );
1424         }
1425
1426         /**
1427          * @param string $table
1428          * @param array $values
1429          * @param array $conds
1430          * @param string $fname
1431          * @param array $options
1432          * @return bool
1433          * @throws DBUnexpectedError
1434          */
1435         function update( $table, $values, $conds, $fname = __METHOD__, $options = array() ) {
1436                 global $wgContLang;
1437
1438                 $table = $this->tableName( $table );
1439                 $opts = $this->makeUpdateOptions( $options );
1440                 $sql = "UPDATE $opts $table SET ";
1441
1442                 $first = true;
1443                 foreach ( $values as $col => &$val ) {
1444                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1445
1446                         if ( !$first ) {
1447                                 $sqlSet = ', ' . $sqlSet;
1448                         } else {
1449                                 $first = false;
1450                         }
1451                         $sql .= $sqlSet;
1452                 }
1453
1454                 if ( $conds !== array() && $conds !== '*' ) {
1455                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1456                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1457                 }
1458
1459                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
1460                         $e = oci_error( $this->mConn );
1461                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1462
1463                         return false;
1464                 }
1465                 foreach ( $values as $col => &$val ) {
1466                         $col_info = $this->fieldInfoMulti( $table, $col );
1467                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1468
1469                         if ( $val === null ) {
1470                                 // do nothing ... null was inserted in statement creation
1471                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1472                                 if ( is_object( $val ) ) {
1473                                         $val = $val->getData();
1474                                 }
1475
1476                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1477                                         $val = '31-12-2030 12:00:00.000000';
1478                                 }
1479
1480                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1481                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1482                                         $e = oci_error( $stmt );
1483                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1484
1485                                         return false;
1486                                 }
1487                         } else {
1488                                 /** @var OCI_Lob[] $lob */
1489                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
1490                                         $e = oci_error( $stmt );
1491                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1492                                 }
1493
1494                                 if ( is_object( $val ) ) {
1495                                         $val = $val->getData();
1496                                 }
1497
1498                                 if ( $col_type == 'BLOB' ) {
1499                                         $lob[$col]->writeTemporary( $val );
1500                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1501                                 } else {
1502                                         $lob[$col]->writeTemporary( $val );
1503                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1504                                 }
1505                         }
1506                 }
1507
1508                 wfSuppressWarnings();
1509
1510                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1511                         $e = oci_error( $stmt );
1512                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1513                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1514
1515                                 return false;
1516                         } else {
1517                                 $this->mAffectedRows = oci_num_rows( $stmt );
1518                         }
1519                 } else {
1520                         $this->mAffectedRows = oci_num_rows( $stmt );
1521                 }
1522
1523                 wfRestoreWarnings();
1524
1525                 if ( isset( $lob ) ) {
1526                         foreach ( $lob as $lob_v ) {
1527                                 $lob_v->free();
1528                         }
1529                 }
1530
1531                 if ( !$this->mTrxLevel ) {
1532                         oci_commit( $this->mConn );
1533                 }
1534
1535                 return oci_free_statement( $stmt );
1536         }
1537
1538         function bitNot( $field ) {
1539                 // expecting bit-fields smaller than 4bytes
1540                 return 'BITNOT(' . $field . ')';
1541         }
1542
1543         function bitAnd( $fieldLeft, $fieldRight ) {
1544                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1545         }
1546
1547         function bitOr( $fieldLeft, $fieldRight ) {
1548                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1549         }
1550
1551         function getDBname() {
1552                 return $this->mDBname;
1553         }
1554
1555         function getServer() {
1556                 return $this->mServer;
1557         }
1558
1559         public function buildGroupConcatField(
1560                 $delim, $table, $field, $conds = '', $join_conds = array()
1561         ) {
1562                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1563
1564                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, array(), $join_conds ) . ')';
1565         }
1566
1567         public function getSearchEngine() {
1568                 return 'SearchOracle';
1569         }
1570
1571         public function getInfinity() {
1572                 return '31-12-2030 12:00:00.000000';
1573         }
1574 }