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