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