includes/db/DatabaseOracle.php

   1 <?php
   2 /**
   3  * This is the Oracle database abstraction layer.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Database
  22  */
  23
  24 /**
  25  * The oci8 extension is fairly weak and doesn't support oci_num_rows, among
  26  * other things. We use a wrapper class to handle that and other
  27  * Oracle-specific bits, like converting column names back to lowercase.
  28  * @ingroup Database
  29  */
  30 class ORAResult {
  31         private $rows;
  32         private $cursor;
  33         private $nrows;
  34
  35         private $columns = array();
  36
  37         private function array_unique_md( $array_in ) {
  38                 $array_out = array();
  39                 $array_hashes = array();
  40
  41                 foreach ( $array_in as $item ) {
  42                         $hash = md5( serialize( $item ) );
  43                         if ( !isset( $array_hashes[$hash] ) ) {
  44                                 $array_hashes[$hash] = $hash;
  45                                 $array_out[] = $item;
  46                         }
  47                 }
  48
  49                 return $array_out;
  50         }
  51
  52         /**
  53          * @param DatabaseBase $db
  54          * @param resource $stmt A valid OCI statement identifier
  55          * @param bool $unique
  56          */
  57         function __construct( &$db, $stmt, $unique = false ) {
  58                 $this->db =& $db;
  59
  60                 $this->nrows = oci_fetch_all( $stmt, $this->rows, 0, -1, OCI_FETCHSTATEMENT_BY_ROW | OCI_NUM );
  61                 if ( $this->nrows === false ) {
  62                         $e = oci_error( $stmt );
  63                         $db->reportQueryError( $e['message'], $e['code'], '', __METHOD__ );
  64                         $this->free();
  65
  66                         return;
  67                 }
  68
  69                 if ( $unique ) {
  70                         $this->rows = $this->array_unique_md( $this->rows );
  71                         $this->nrows = count( $this->rows );
  72                 }
  73
  74                 if ( $this->nrows > 0 ) {
  75                         foreach ( $this->rows[0] as $k => $v ) {
  76                                 $this->columns[$k] = strtolower( oci_field_name( $stmt, $k + 1 ) );
  77                         }
  78                 }
  79
  80                 $this->cursor = 0;
  81                 oci_free_statement( $stmt );
  82         }
  83
  84         public function free() {
  85                 unset( $this->db );
  86         }
  87
  88         public function seek( $row ) {
  89                 $this->cursor = min( $row, $this->nrows );
  90         }
  91
  92         public function numRows() {
  93                 return $this->nrows;
  94         }
  95
  96         public function numFields() {
  97                 return count( $this->columns );
  98         }
  99
 100         public function fetchObject() {
 101                 if ( $this->cursor >= $this->nrows ) {
 102                         return false;
 103                 }
 104                 $row = $this->rows[$this->cursor++];
 105                 $ret = new stdClass();
 106                 foreach ( $row as $k => $v ) {
 107                         $lc = $this->columns[$k];
 108                         $ret->$lc = $v;
 109                 }
 110
 111                 return $ret;
 112         }
 113
 114         public function fetchRow() {
 115                 if ( $this->cursor >= $this->nrows ) {
 116                         return false;
 117                 }
 118
 119                 $row = $this->rows[$this->cursor++];
 120                 $ret = array();
 121                 foreach ( $row as $k => $v ) {
 122                         $lc = $this->columns[$k];
 123                         $ret[$lc] = $v;
 124                         $ret[$k] = $v;
 125                 }
 126
 127                 return $ret;
 128         }
 129 }
 130
 131 /**
 132  * Utility class.
 133  * @ingroup Database
 134  */
 135 class ORAField implements Field {
 136         private $name, $tablename, $default, $max_length, $nullable,
 137                 $is_pk, $is_unique, $is_multiple, $is_key, $type;
 138
 139         function __construct( $info ) {
 140                 $this->name = $info['column_name'];
 141                 $this->tablename = $info['table_name'];
 142                 $this->default = $info['data_default'];
 143                 $this->max_length = $info['data_length'];
 144                 $this->nullable = $info['not_null'];
 145                 $this->is_pk = isset( $info['prim'] ) && $info['prim'] == 1 ? 1 : 0;
 146                 $this->is_unique = isset( $info['uniq'] ) && $info['uniq'] == 1 ? 1 : 0;
 147                 $this->is_multiple = isset( $info['nonuniq'] ) && $info['nonuniq'] == 1 ? 1 : 0;
 148                 $this->is_key = ( $this->is_pk || $this->is_unique || $this->is_multiple );
 149                 $this->type = $info['data_type'];
 150         }
 151
 152         function name() {
 153                 return $this->name;
 154         }
 155
 156         function tableName() {
 157                 return $this->tablename;
 158         }
 159
 160         function defaultValue() {
 161                 return $this->default;
 162         }
 163
 164         function maxLength() {
 165                 return $this->max_length;
 166         }
 167
 168         function isNullable() {
 169                 return $this->nullable;
 170         }
 171
 172         function isKey() {
 173                 return $this->is_key;
 174         }
 175
 176         function isMultipleKey() {
 177                 return $this->is_multiple;
 178         }
 179
 180         function type() {
 181                 return $this->type;
 182         }
 183 }
 184
 185 /**
 186  * @ingroup Database
 187  */
 188 class DatabaseOracle extends DatabaseBase {
 189         /** @var resource */
 190         protected $mLastResult = null;
 191
 192         /** @var int The number of rows affected as an integer */
 193         protected $mAffectedRows;
 194
 195         /** @var int */
 196         private $mInsertId = null;
 197
 198         /** @var bool */
 199         private $ignoreDupValOnIndex = false;
 200
 201         /** @var bool|array */
 202         private $sequenceData = null;
 203
 204         /** @var string Character set for Oracle database */
 205         private $defaultCharset = 'AL32UTF8';
 206
 207         /** @var array */
 208         private $mFieldInfoCache = array();
 209
 210         function __construct( $p = null ) {
 211                 global $wgDBprefix;
 212
 213                 if ( !is_array( $p ) ) { // legacy calling pattern
 214                         wfDeprecated( __METHOD__ . " method called without parameter array.", "1.22" );
 215                         $args = func_get_args();
 216                         $p = array(
 217                                 'host' => isset( $args[0] ) ? $args[0] : false,
 218                                 'user' => isset( $args[1] ) ? $args[1] : false,
 219                                 'password' => isset( $args[2] ) ? $args[2] : false,
 220                                 'dbname' => isset( $args[3] ) ? $args[3] : false,
 221                                 'flags' => isset( $args[4] ) ? $args[4] : 0,
 222                                 'tablePrefix' => isset( $args[5] ) ? $args[5] : 'get from global',
 223                                 'schema' => 'get from global',
 224                                 'foreign' => isset( $args[6] ) ? $args[6] : false
 225                         );
 226                 }
 227                 if ( $p['tablePrefix'] == 'get from global' ) {
 228                         $p['tablePrefix'] = $wgDBprefix;
 229                 }
 230                 $p['tablePrefix'] = strtoupper( $p['tablePrefix'] );
 231                 parent::__construct( $p );
 232                 wfRunHooks( 'DatabaseOraclePostInit', array( $this ) );
 233         }
 234
 235         function __destruct() {
 236                 if ( $this->mOpened ) {
 237                         wfSuppressWarnings();
 238                         $this->close();
 239                         wfRestoreWarnings();
 240                 }
 241         }
 242
 243         function getType() {
 244                 return 'oracle';
 245         }
 246
 247         function cascadingDeletes() {
 248                 return true;
 249         }
 250
 251         function cleanupTriggers() {
 252                 return true;
 253         }
 254
 255         function strictIPs() {
 256                 return true;
 257         }
 258
 259         function realTimestamps() {
 260                 return true;
 261         }
 262
 263         function implicitGroupby() {
 264                 return false;
 265         }
 266
 267         function implicitOrderby() {
 268                 return false;
 269         }
 270
 271         function searchableIPs() {
 272                 return true;
 273         }
 274
 275         /**
 276          * Usually aborts on failure
 277          * @param string $server
 278          * @param string $user
 279          * @param string $password
 280          * @param string $dbName
 281          * @throws DBConnectionError
 282          * @return DatabaseBase|null
 283          */
 284         function open( $server, $user, $password, $dbName ) {
 285                 global $wgDBOracleDRCP;
 286                 if ( !function_exists( 'oci_connect' ) ) {
 287                         throw new DBConnectionError(
 288                                 $this,
 289                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
 290                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
 291                                         "and database)\n" );
 292                 }
 293
 294                 $this->close();
 295                 $this->mUser = $user;
 296                 $this->mPassword = $password;
 297                 // changed internal variables functions
 298                 // mServer now holds the TNS endpoint
 299                 // mDBname is schema name if different from username
 300                 if ( !$server ) {
 301                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 302                         $this->mServer = $dbName;
 303                         $this->mDBname = $user;
 304                 } else {
 305                         $this->mServer = $server;
 306                         if ( !$dbName ) {
 307                                 $this->mDBname = $user;
 308                         } else {
 309                                 $this->mDBname = $dbName;
 310                         }
 311                 }
 312
 313                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 314                         return null;
 315                 }
 316
 317                 if ( $wgDBOracleDRCP ) {
 318                         $this->setFlag( DBO_PERSISTENT );
 319                 }
 320
 321                 $session_mode = $this->mFlags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 322
 323                 wfSuppressWarnings();
 324                 if ( $this->mFlags & DBO_PERSISTENT ) {
 325                         $this->mConn = oci_pconnect(
 326                                 $this->mUser,
 327                                 $this->mPassword,
 328                                 $this->mServer,
 329                                 $this->defaultCharset,
 330                                 $session_mode
 331                         );
 332                 } elseif ( $this->mFlags & DBO_DEFAULT ) {
 333                         $this->mConn = oci_new_connect(
 334                                 $this->mUser,
 335                                 $this->mPassword,
 336                                 $this->mServer,
 337                                 $this->defaultCharset,
 338                                 $session_mode
 339                         );
 340                 } else {
 341                         $this->mConn = oci_connect(
 342                                 $this->mUser,
 343                                 $this->mPassword,
 344                                 $this->mServer,
 345                                 $this->defaultCharset,
 346                                 $session_mode
 347                         );
 348                 }
 349                 wfRestoreWarnings();
 350
 351                 if ( $this->mUser != $this->mDBname ) {
 352                         //change current schema in session
 353                         $this->selectDB( $this->mDBname );
 354                 }
 355
 356                 if ( !$this->mConn ) {
 357                         throw new DBConnectionError( $this, $this->lastError() );
 358                 }
 359
 360                 $this->mOpened = true;
 361
 362                 # removed putenv calls because they interfere with the system globaly
 363                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 364                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 365                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 366
 367                 return $this->mConn;
 368         }
 369
 370         /**
 371          * Closes a database connection, if it is open
 372          * Returns success, true if already closed
 373          * @return bool
 374          */
 375         protected function closeConnection() {
 376                 return oci_close( $this->mConn );
 377         }
 378
 379         function execFlags() {
 380                 return $this->mTrxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 381         }
 382
 383         protected function doQuery( $sql ) {
 384                 wfDebug( "SQL: [$sql]\n" );
 385                 if ( !StringUtils::isUtf8( $sql ) ) {
 386                         throw new MWException( "SQL encoding is invalid\n$sql" );
 387                 }
 388
 389                 // handle some oracle specifics
 390                 // remove AS column/table/subquery namings
 391                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 392                         $sql = preg_replace( '/ as /i', ' ', $sql );
 393                 }
 394
 395                 // Oracle has issues with UNION clause if the statement includes LOB fields
 396                 // So we do a UNION ALL and then filter the results array with array_unique
 397                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 398                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 399                 // you have to select data from plan table after explain
 400                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 401
 402                 $sql = preg_replace(
 403                         '/^EXPLAIN /',
 404                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 405                         $sql,
 406                         1,
 407                         $explain_count
 408                 );
 409
 410                 wfSuppressWarnings();
 411
 412                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 413                         $e = oci_error( $this->mConn );
 414                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 415
 416                         return false;
 417                 }
 418
 419                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 420                         $e = oci_error( $stmt );
 421                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 422                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 423
 424                                 return false;
 425                         }
 426                 }
 427
 428                 wfRestoreWarnings();
 429
 430                 if ( $explain_count > 0 ) {
 431                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 432                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 433                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 434                         return new ORAResult( $this, $stmt, $union_unique );
 435                 } else {
 436                         $this->mAffectedRows = oci_num_rows( $stmt );
 437
 438                         return true;
 439                 }
 440         }
 441
 442         function queryIgnore( $sql, $fname = '' ) {
 443                 return $this->query( $sql, $fname, true );
 444         }
 445
 446         /**
 447          * Frees resources associated with the LOB descriptor
 448          * @param ResultWrapper|resource $res
 449          */
 450         function freeResult( $res ) {
 451                 if ( $res instanceof ResultWrapper ) {
 452                         $res = $res->result;
 453                 }
 454
 455                 $res->free();
 456         }
 457
 458         /**
 459          * @param ResultWrapper|stdClass $res
 460          * @return mixed
 461          */
 462         function fetchObject( $res ) {
 463                 if ( $res instanceof ResultWrapper ) {
 464                         $res = $res->result;
 465                 }
 466
 467                 return $res->fetchObject();
 468         }
 469
 470         function fetchRow( $res ) {
 471                 if ( $res instanceof ResultWrapper ) {
 472                         $res = $res->result;
 473                 }
 474
 475                 return $res->fetchRow();
 476         }
 477
 478         function numRows( $res ) {
 479                 if ( $res instanceof ResultWrapper ) {
 480                         $res = $res->result;
 481                 }
 482
 483                 return $res->numRows();
 484         }
 485
 486         function numFields( $res ) {
 487                 if ( $res instanceof ResultWrapper ) {
 488                         $res = $res->result;
 489                 }
 490
 491                 return $res->numFields();
 492         }
 493
 494         function fieldName( $stmt, $n ) {
 495                 return oci_field_name( $stmt, $n );
 496         }
 497
 498         /**
 499          * This must be called after nextSequenceVal
 500          * @return null|int
 501          */
 502         function insertId() {
 503                 return $this->mInsertId;
 504         }
 505
 506         /**
 507          * @param mixed $res
 508          * @param int $row
 509          */
 510         function dataSeek( $res, $row ) {
 511                 if ( $res instanceof ORAResult ) {
 512                         $res->seek( $row );
 513                 } else {
 514                         $res->result->seek( $row );
 515                 }
 516         }
 517
 518         function lastError() {
 519                 if ( $this->mConn === false ) {
 520                         $e = oci_error();
 521                 } else {
 522                         $e = oci_error( $this->mConn );
 523                 }
 524
 525                 return $e['message'];
 526         }
 527
 528         function lastErrno() {
 529                 if ( $this->mConn === false ) {
 530                         $e = oci_error();
 531                 } else {
 532                         $e = oci_error( $this->mConn );
 533                 }
 534
 535                 return $e['code'];
 536         }
 537
 538         function affectedRows() {
 539                 return $this->mAffectedRows;
 540         }
 541
 542         /**
 543          * Returns information about an index
 544          * If errors are explicitly ignored, returns NULL on failure
 545          * @param string $table
 546          * @param string $index
 547          * @param string $fname
 548          * @return bool
 549          */
 550         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 551                 return false;
 552         }
 553
 554         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 555                 return false;
 556         }
 557
 558         function insert( $table, $a, $fname = __METHOD__, $options = array() ) {
 559                 if ( !count( $a ) ) {
 560                         return true;
 561                 }
 562
 563                 if ( !is_array( $options ) ) {
 564                         $options = array( $options );
 565                 }
 566
 567                 if ( in_array( 'IGNORE', $options ) ) {
 568                         $this->ignoreDupValOnIndex = true;
 569                 }
 570
 571                 if ( !is_array( reset( $a ) ) ) {
 572                         $a = array( $a );
 573                 }
 574
 575                 foreach ( $a as &$row ) {
 576                         $this->insertOneRow( $table, $row, $fname );
 577                 }
 578                 $retVal = true;
 579
 580                 if ( in_array( 'IGNORE', $options ) ) {
 581                         $this->ignoreDupValOnIndex = false;
 582                 }
 583
 584                 return $retVal;
 585         }
 586
 587         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 588                 $col_info = $this->fieldInfoMulti( $table, $col );
 589                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 590
 591                 $bind = '';
 592                 if ( is_numeric( $col ) ) {
 593                         $bind = $val;
 594                         $val = null;
 595
 596                         return $bind;
 597                 } elseif ( $includeCol ) {
 598                         $bind = "$col = ";
 599                 }
 600
 601                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 602                         $val = null;
 603                 }
 604
 605                 if ( $val === 'NULL' ) {
 606                         $val = null;
 607                 }
 608
 609                 if ( $val === null ) {
 610                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 611                                 $bind .= 'DEFAULT';
 612                         } else {
 613                                 $bind .= 'NULL';
 614                         }
 615                 } else {
 616                         $bind .= ':' . $col;
 617                 }
 618
 619                 return $bind;
 620         }
 621
 622         /**
 623          * @param string $table
 624          * @param $row
 625          * @param string $fname
 626          * @return bool
 627          * @throws DBUnexpectedError
 628          */
 629         private function insertOneRow( $table, $row, $fname ) {
 630                 global $wgContLang;
 631
 632                 $table = $this->tableName( $table );
 633                 // "INSERT INTO tables (a, b, c)"
 634                 $sql = "INSERT INTO " . $table . " (" . join( ',', array_keys( $row ) ) . ')';
 635                 $sql .= " VALUES (";
 636
 637                 // for each value, append ":key"
 638                 $first = true;
 639                 foreach ( $row as $col => &$val ) {
 640                         if ( !$first ) {
 641                                 $sql .= ', ';
 642                         } else {
 643                                 $first = false;
 644                         }
 645
 646                         $sql .= $this->fieldBindStatement( $table, $col, $val );
 647                 }
 648                 $sql .= ')';
 649
 650                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
 651                         $e = oci_error( $this->mConn );
 652                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 653
 654                         return false;
 655                 }
 656                 foreach ( $row as $col => &$val ) {
 657                         $col_info = $this->fieldInfoMulti( $table, $col );
 658                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 659
 660                         if ( $val === null ) {
 661                                 // do nothing ... null was inserted in statement creation
 662                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 663                                 if ( is_object( $val ) ) {
 664                                         $val = $val->fetch();
 665                                 }
 666
 667                                 // backward compatibility
 668                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 669                                         $val = $this->getInfinity();
 670                                 }
 671
 672                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
 673                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 674                                         $e = oci_error( $stmt );
 675                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 676
 677                                         return false;
 678                                 }
 679                         } else {
 680                                 /** @var OCI_Lob[] $lob */
 681                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
 682                                         $e = oci_error( $stmt );
 683                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 684                                 }
 685
 686                                 if ( is_object( $val ) ) {
 687                                         $val = $val->fetch();
 688                                 }
 689
 690                                 if ( $col_type == 'BLOB' ) {
 691                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 692                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 693                                 } else {
 694                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 695                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 696                                 }
 697                         }
 698                 }
 699
 700                 wfSuppressWarnings();
 701
 702                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 703                         $e = oci_error( $stmt );
 704                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 705                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 706
 707                                 return false;
 708                         } else {
 709                                 $this->mAffectedRows = oci_num_rows( $stmt );
 710                         }
 711                 } else {
 712                         $this->mAffectedRows = oci_num_rows( $stmt );
 713                 }
 714
 715                 wfRestoreWarnings();
 716
 717                 if ( isset( $lob ) ) {
 718                         foreach ( $lob as $lob_v ) {
 719                                 $lob_v->free();
 720                         }
 721                 }
 722
 723                 if ( !$this->mTrxLevel ) {
 724                         oci_commit( $this->mConn );
 725                 }
 726
 727                 return oci_free_statement( $stmt );
 728         }
 729
 730         function insertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 731                 $insertOptions = array(), $selectOptions = array()
 732         ) {
 733                 $destTable = $this->tableName( $destTable );
 734                 if ( !is_array( $selectOptions ) ) {
 735                         $selectOptions = array( $selectOptions );
 736                 }
 737                 list( $startOpts, $useIndex, $tailOpts ) = $this->makeSelectOptions( $selectOptions );
 738                 if ( is_array( $srcTable ) ) {
 739                         $srcTable = implode( ',', array_map( array( &$this, 'tableName' ), $srcTable ) );
 740                 } else {
 741                         $srcTable = $this->tableName( $srcTable );
 742                 }
 743
 744                 if ( ( $sequenceData = $this->getSequenceData( $destTable ) ) !== false &&
 745                         !isset( $varMap[$sequenceData['column']] )
 746                 ) {
 747                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 748                 }
 749
 750                 // count-alias subselect fields to avoid abigious definition errors
 751                 $i = 0;
 752                 foreach ( $varMap as &$val ) {
 753                         $val = $val . ' field' . ( $i++ );
 754                 }
 755
 756                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ')' .
 757                         " SELECT $startOpts " . implode( ',', $varMap ) .
 758                         " FROM $srcTable $useIndex ";
 759                 if ( $conds != '*' ) {
 760                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
 761                 }
 762                 $sql .= " $tailOpts";
 763
 764                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 765                         $this->ignoreDupValOnIndex = true;
 766                 }
 767
 768                 $retval = $this->query( $sql, $fname );
 769
 770                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 771                         $this->ignoreDupValOnIndex = false;
 772                 }
 773
 774                 return $retval;
 775         }
 776
 777         function tableName( $name, $format = 'quoted' ) {
 778                 /*
 779                 Replace reserved words with better ones
 780                 Using uppercase because that's the only way Oracle can handle
 781                 quoted tablenames
 782                 */
 783                 switch ( $name ) {
 784                         case 'user':
 785                                 $name = 'MWUSER';
 786                                 break;
 787                         case 'text':
 788                                 $name = 'PAGECONTENT';
 789                                 break;
 790                 }
 791
 792                 return strtoupper( parent::tableName( $name, $format ) );
 793         }
 794
 795         function tableNameInternal( $name ) {
 796                 $name = $this->tableName( $name );
 797
 798                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 799         }
 800
 801         /**
 802          * Return the next in a sequence, save the value for retrieval via insertId()
 803          *
 804          * @param string $seqName
 805          * @return null|int
 806          */
 807         function nextSequenceValue( $seqName ) {
 808                 $res = $this->query( "SELECT $seqName.nextval FROM dual" );
 809                 $row = $this->fetchRow( $res );
 810                 $this->mInsertId = $row[0];
 811
 812                 return $this->mInsertId;
 813         }
 814
 815         /**
 816          * Return sequence_name if table has a sequence
 817          *
 818          * @param string $table
 819          * @return bool
 820          */
 821         private function getSequenceData( $table ) {
 822                 if ( $this->sequenceData == null ) {
 823                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 824                                 lower(atc.table_name),
 825                                 lower(atc.column_name)
 826                         FROM all_sequences asq, all_tab_columns atc
 827                         WHERE decode(
 828                                         atc.table_name,
 829                                         '{$this->mTablePrefix}MWUSER',
 830                                         '{$this->mTablePrefix}USER',
 831                                         atc.table_name
 832                                 ) || '_' ||
 833                                 atc.column_name || '_SEQ' = '{$this->mTablePrefix}' || asq.sequence_name
 834                                 AND asq.sequence_owner = upper('{$this->mDBname}')
 835                                 AND atc.owner = upper('{$this->mDBname}')" );
 836
 837                         while ( ( $row = $result->fetchRow() ) !== false ) {
 838                                 $this->sequenceData[$row[1]] = array(
 839                                         'sequence' => $row[0],
 840                                         'column' => $row[2]
 841                                 );
 842                         }
 843                 }
 844                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 845
 846                 return ( isset( $this->sequenceData[$table] ) ) ? $this->sequenceData[$table] : false;
 847         }
 848
 849         /**
 850          * Returns the size of a text field, or -1 for "unlimited"
 851          *
 852          * @param string $table
 853          * @param string $field
 854          * @return mixed
 855          */
 856         function textFieldSize( $table, $field ) {
 857                 $fieldInfoData = $this->fieldInfo( $table, $field );
 858
 859                 return $fieldInfoData->maxLength();
 860         }
 861
 862         function limitResult( $sql, $limit, $offset = false ) {
 863                 if ( $offset === false ) {
 864                         $offset = 0;
 865                 }
 866
 867                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 868         }
 869
 870         function encodeBlob( $b ) {
 871                 return new Blob( $b );
 872         }
 873
 874         function decodeBlob( $b ) {
 875                 if ( $b instanceof Blob ) {
 876                         $b = $b->fetch();
 877                 }
 878
 879                 return $b;
 880         }
 881
 882         function unionQueries( $sqls, $all ) {
 883                 $glue = ' UNION ALL ';
 884
 885                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 886                         'FROM (' . implode( $glue, $sqls ) . ')';
 887         }
 888
 889         function wasDeadlock() {
 890                 return $this->lastErrno() == 'OCI-00060';
 891         }
 892
 893         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 894                 $fname = __METHOD__
 895         ) {
 896                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 897
 898                 $newName = strtoupper( $newName );
 899                 $oldName = strtoupper( $oldName );
 900
 901                 $tabName = substr( $newName, strlen( $this->mTablePrefix ) );
 902                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 903                 $newPrefix = strtoupper( $this->mTablePrefix );
 904
 905                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 906                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 907         }
 908
 909         function listTables( $prefix = null, $fname = __METHOD__ ) {
 910                 $listWhere = '';
 911                 if ( !empty( $prefix ) ) {
 912                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 913                 }
 914
 915                 $owner = strtoupper( $this->mDBname );
 916                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 917                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 918
 919                 // dirty code ... i know
 920                 $endArray = array();
 921                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 922                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 923                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 924                 $fixedOrderTabs = $endArray;
 925                 while ( ( $row = $result->fetchRow() ) !== false ) {
 926                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 927                                 $endArray[] = $row['table_name'];
 928                         }
 929                 }
 930
 931                 return $endArray;
 932         }
 933
 934         public function dropTable( $tableName, $fName = __METHOD__ ) {
 935                 $tableName = $this->tableName( $tableName );
 936                 if ( !$this->tableExists( $tableName ) ) {
 937                         return false;
 938                 }
 939
 940                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 941         }
 942
 943         function timestamp( $ts = 0 ) {
 944                 return wfTimestamp( TS_ORACLE, $ts );
 945         }
 946
 947         /**
 948          * Return aggregated value function call
 949          *
 950          * @param $valuedata
 951          * @param string $valuename
 952          * @return mixed
 953          */
 954         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 955                 return $valuedata;
 956         }
 957
 958         function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false ) {
 959                 # Ignore errors during error handling to avoid infinite
 960                 # recursion
 961                 $ignore = $this->ignoreErrors( true );
 962                 ++$this->mErrorCount;
 963
 964                 if ( $ignore || $tempIgnore ) {
 965                         wfDebug( "SQL ERROR (ignored): $error\n" );
 966                         $this->ignoreErrors( $ignore );
 967                 } else {
 968                         throw new DBQueryError( $this, $error, $errno, $sql, $fname );
 969                 }
 970         }
 971
 972         /**
 973          * @return string wikitext of a link to the server software's web site
 974          */
 975         public function getSoftwareLink() {
 976                 return '[{{int:version-db-oracle-url}} Oracle]';
 977         }
 978
 979         /**
 980          * @return string Version information from the database
 981          */
 982         function getServerVersion() {
 983                 //better version number, fallback on driver
 984                 $rset = $this->doQuery(
 985                         'SELECT version FROM product_component_version ' .
 986                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 987                 );
 988                 if ( !( $row = $rset->fetchRow() ) ) {
 989                         return oci_server_version( $this->mConn );
 990                 }
 991
 992                 return $row['version'];
 993         }
 994
 995         /**
 996          * Query whether a given index exists
 997          * @param string $table
 998          * @param string $index
 999          * @param string $fname
1000          * @return bool
1001          */
1002         function indexExists( $table, $index, $fname = __METHOD__ ) {
1003                 $table = $this->tableName( $table );
1004                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
1005                 $index = strtoupper( $index );
1006                 $owner = strtoupper( $this->mDBname );
1007                 $SQL = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
1008                 $res = $this->doQuery( $SQL );
1009                 if ( $res ) {
1010                         $count = $res->numRows();
1011                         $res->free();
1012                 } else {
1013                         $count = 0;
1014                 }
1015
1016                 return $count != 0;
1017         }
1018
1019         /**
1020          * Query whether a given table exists (in the given schema, or the default mw one if not given)
1021          * @param string $table
1022          * @param string $fname
1023          * @return bool
1024          */
1025         function tableExists( $table, $fname = __METHOD__ ) {
1026                 $table = $this->tableName( $table );
1027                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
1028                 $owner = $this->addQuotes( strtoupper( $this->mDBname ) );
1029                 $SQL = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
1030                 $res = $this->doQuery( $SQL );
1031                 if ( $res && $res->numRows() > 0 ) {
1032                         $exists = true;
1033                 } else {
1034                         $exists = false;
1035                 }
1036
1037                 $res->free();
1038
1039                 return $exists;
1040         }
1041
1042         /**
1043          * Function translates mysql_fetch_field() functionality on ORACLE.
1044          * Caching is present for reducing query time.
1045          * For internal calls. Use fieldInfo for normal usage.
1046          * Returns false if the field doesn't exist
1047          *
1048          * @param array|string $table
1049          * @param string $field
1050          * @return ORAField|ORAResult
1051          */
1052         private function fieldInfoMulti( $table, $field ) {
1053                 $field = strtoupper( $field );
1054                 if ( is_array( $table ) ) {
1055                         $table = array_map( array( &$this, 'tableNameInternal' ), $table );
1056                         $tableWhere = 'IN (';
1057                         foreach ( $table as &$singleTable ) {
1058                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
1059                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
1060                                         return $this->mFieldInfoCache["$singleTable.$field"];
1061                                 }
1062                                 $tableWhere .= '\'' . $singleTable . '\',';
1063                         }
1064                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
1065                 } else {
1066                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
1067                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
1068                                 return $this->mFieldInfoCache["$table.$field"];
1069                         }
1070                         $tableWhere = '= \'' . $table . '\'';
1071                 }
1072
1073                 $fieldInfoStmt = oci_parse(
1074                         $this->mConn,
1075                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
1076                                 $tableWhere . ' and column_name = \'' . $field . '\''
1077                 );
1078                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
1079                         $e = oci_error( $fieldInfoStmt );
1080                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
1081
1082                         return false;
1083                 }
1084                 $res = new ORAResult( $this, $fieldInfoStmt );
1085                 if ( $res->numRows() == 0 ) {
1086                         if ( is_array( $table ) ) {
1087                                 foreach ( $table as &$singleTable ) {
1088                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
1089                                 }
1090                         } else {
1091                                 $this->mFieldInfoCache["$table.$field"] = false;
1092                         }
1093                         $fieldInfoTemp = null;
1094                 } else {
1095                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
1096                         $table = $fieldInfoTemp->tableName();
1097                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
1098                 }
1099                 $res->free();
1100
1101                 return $fieldInfoTemp;
1102         }
1103
1104         /**
1105          * @throws DBUnexpectedError
1106          * @param  string $table
1107          * @param  string $field
1108          * @return ORAField
1109          */
1110         function fieldInfo( $table, $field ) {
1111                 if ( is_array( $table ) ) {
1112                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
1113                 }
1114
1115                 return $this->fieldInfoMulti( $table, $field );
1116         }
1117
1118         protected function doBegin( $fname = __METHOD__ ) {
1119                 $this->mTrxLevel = 1;
1120                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
1121         }
1122
1123         protected function doCommit( $fname = __METHOD__ ) {
1124                 if ( $this->mTrxLevel ) {
1125                         $ret = oci_commit( $this->mConn );
1126                         if ( !$ret ) {
1127                                 throw new DBUnexpectedError( $this, $this->lastError() );
1128                         }
1129                         $this->mTrxLevel = 0;
1130                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
1131                 }
1132         }
1133
1134         protected function doRollback( $fname = __METHOD__ ) {
1135                 if ( $this->mTrxLevel ) {
1136                         oci_rollback( $this->mConn );
1137                         $this->mTrxLevel = 0;
1138                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
1139                 }
1140         }
1141
1142         /**
1143          * defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
1144          *
1145          * @param resource $fp
1146          * @param bool|string $lineCallback
1147          * @param bool|callable $resultCallback
1148          * @param string $fname
1149          * @param bool|callable $inputCallback
1150          * @return bool|string
1151          */
1152         function sourceStream( $fp, $lineCallback = false, $resultCallback = false,
1153                 $fname = __METHOD__, $inputCallback = false ) {
1154                 $cmd = '';
1155                 $done = false;
1156                 $dollarquote = false;
1157
1158                 $replacements = array();
1159
1160                 while ( !feof( $fp ) ) {
1161                         if ( $lineCallback ) {
1162                                 call_user_func( $lineCallback );
1163                         }
1164                         $line = trim( fgets( $fp, 1024 ) );
1165                         $sl = strlen( $line ) - 1;
1166
1167                         if ( $sl < 0 ) {
1168                                 continue;
1169                         }
1170                         if ( '-' == $line[0] && '-' == $line[1] ) {
1171                                 continue;
1172                         }
1173
1174                         // Allow dollar quoting for function declarations
1175                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
1176                                 if ( $dollarquote ) {
1177                                         $dollarquote = false;
1178                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
1179                                         $done = true;
1180                                 } else {
1181                                         $dollarquote = true;
1182                                 }
1183                         } elseif ( !$dollarquote ) {
1184                                 if ( ';' == $line[$sl] && ( $sl < 2 || ';' != $line[$sl - 1] ) ) {
1185                                         $done = true;
1186                                         $line = substr( $line, 0, $sl );
1187                                 }
1188                         }
1189
1190                         if ( $cmd != '' ) {
1191                                 $cmd .= ' ';
1192                         }
1193                         $cmd .= "$line\n";
1194
1195                         if ( $done ) {
1196                                 $cmd = str_replace( ';;', ";", $cmd );
1197                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1198                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1199                                                 $replacements[$defines[2]] = $defines[1];
1200                                         }
1201                                 } else {
1202                                         foreach ( $replacements as $mwVar => $scVar ) {
1203                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1204                                         }
1205
1206                                         $cmd = $this->replaceVars( $cmd );
1207                                         if ( $inputCallback ) {
1208                                                 call_user_func( $inputCallback, $cmd );
1209                                         }
1210                                         $res = $this->doQuery( $cmd );
1211                                         if ( $resultCallback ) {
1212                                                 call_user_func( $resultCallback, $res, $this );
1213                                         }
1214
1215                                         if ( false === $res ) {
1216                                                 $err = $this->lastError();
1217
1218                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1219                                         }
1220                                 }
1221
1222                                 $cmd = '';
1223                                 $done = false;
1224                         }
1225                 }
1226
1227                 return true;
1228         }
1229
1230         function selectDB( $db ) {
1231                 $this->mDBname = $db;
1232                 if ( $db == null || $db == $this->mUser ) {
1233                         return true;
1234                 }
1235                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper( $db );
1236                 $stmt = oci_parse( $this->mConn, $sql );
1237                 wfSuppressWarnings();
1238                 $success = oci_execute( $stmt );
1239                 wfRestoreWarnings();
1240                 if ( !$success ) {
1241                         $e = oci_error( $stmt );
1242                         if ( $e['code'] != '1435' ) {
1243                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1244                         }
1245
1246                         return false;
1247                 }
1248
1249                 return true;
1250         }
1251
1252         function strencode( $s ) {
1253                 return str_replace( "'", "''", $s );
1254         }
1255
1256         function addQuotes( $s ) {
1257                 global $wgContLang;
1258                 if ( isset( $wgContLang->mLoaded ) && $wgContLang->mLoaded ) {
1259                         $s = $wgContLang->checkTitleEncoding( $s );
1260                 }
1261
1262                 return "'" . $this->strencode( $s ) . "'";
1263         }
1264
1265         public function addIdentifierQuotes( $s ) {
1266                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1267                         $s = '/*Q*/' . $s;
1268                 }
1269
1270                 return $s;
1271         }
1272
1273         public function removeIdentifierQuotes( $s ) {
1274                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1275         }
1276
1277         public function isQuotedIdentifier( $s ) {
1278                 return strpos( $s, '/*Q*/' ) !== false;
1279         }
1280
1281         private function wrapFieldForWhere( $table, &$col, &$val ) {
1282                 global $wgContLang;
1283
1284                 $col_info = $this->fieldInfoMulti( $table, $col );
1285                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1286                 if ( $col_type == 'CLOB' ) {
1287                         $col = 'TO_CHAR(' . $col . ')';
1288                         $val = $wgContLang->checkTitleEncoding( $val );
1289                 } elseif ( $col_type == 'VARCHAR2' ) {
1290                         $val = $wgContLang->checkTitleEncoding( $val );
1291                 }
1292         }
1293
1294         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1295                 $conds2 = array();
1296                 foreach ( $conds as $col => $val ) {
1297                         if ( is_array( $val ) ) {
1298                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1299                         } else {
1300                                 if ( is_numeric( $col ) && $parentCol != null ) {
1301                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1302                                 } else {
1303                                         $this->wrapFieldForWhere( $table, $col, $val );
1304                                 }
1305                                 $conds2[$col] = $val;
1306                         }
1307                 }
1308
1309                 return $conds2;
1310         }
1311
1312         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1313                 $options = array(), $join_conds = array()
1314         ) {
1315                 if ( is_array( $conds ) ) {
1316                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1317                 }
1318
1319                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1320         }
1321
1322         /**
1323          * Returns an optional USE INDEX clause to go after the table, and a
1324          * string to go at the end of the query
1325          *
1326          * @param array $options An associative array of options to be turned into
1327          *   an SQL query, valid keys are listed in the function.
1328          * @return array
1329          */
1330         function makeSelectOptions( $options ) {
1331                 $preLimitTail = $postLimitTail = '';
1332                 $startOpts = '';
1333
1334                 $noKeyOptions = array();
1335                 foreach ( $options as $key => $option ) {
1336                         if ( is_numeric( $key ) ) {
1337                                 $noKeyOptions[$option] = true;
1338                         }
1339                 }
1340
1341                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1342
1343                 $preLimitTail .= $this->makeOrderBy( $options );
1344
1345                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1346                         $postLimitTail .= ' FOR UPDATE';
1347                 }
1348
1349                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1350                         $startOpts .= 'DISTINCT';
1351                 }
1352
1353                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1354                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1355                 } else {
1356                         $useIndex = '';
1357                 }
1358
1359                 return array( $startOpts, $useIndex, $preLimitTail, $postLimitTail );
1360         }
1361
1362         public function delete( $table, $conds, $fname = __METHOD__ ) {
1363                 if ( is_array( $conds ) ) {
1364                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1365                 }
1366                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1367                 // all deletions on these tables have transactions so final failure rollbacks these updates
1368                 $table = $this->tableName( $table );
1369                 if ( $table == $this->tableName( 'user' ) ) {
1370                         $this->update( 'archive', array( 'ar_user' => 0 ),
1371                                 array( 'ar_user' => $conds['user_id'] ), $fname );
1372                         $this->update( 'ipblocks', array( 'ipb_user' => 0 ),
1373                                 array( 'ipb_user' => $conds['user_id'] ), $fname );
1374                         $this->update( 'image', array( 'img_user' => 0 ),
1375                                 array( 'img_user' => $conds['user_id'] ), $fname );
1376                         $this->update( 'oldimage', array( 'oi_user' => 0 ),
1377                                 array( 'oi_user' => $conds['user_id'] ), $fname );
1378                         $this->update( 'filearchive', array( 'fa_deleted_user' => 0 ),
1379                                 array( 'fa_deleted_user' => $conds['user_id'] ), $fname );
1380                         $this->update( 'filearchive', array( 'fa_user' => 0 ),
1381                                 array( 'fa_user' => $conds['user_id'] ), $fname );
1382                         $this->update( 'uploadstash', array( 'us_user' => 0 ),
1383                                 array( 'us_user' => $conds['user_id'] ), $fname );
1384                         $this->update( 'recentchanges', array( 'rc_user' => 0 ),
1385                                 array( 'rc_user' => $conds['user_id'] ), $fname );
1386                         $this->update( 'logging', array( 'log_user' => 0 ),
1387                                 array( 'log_user' => $conds['user_id'] ), $fname );
1388                 } elseif ( $table == $this->tableName( 'image' ) ) {
1389                         $this->update( 'oldimage', array( 'oi_name' => 0 ),
1390                                 array( 'oi_name' => $conds['img_name'] ), $fname );
1391                 }
1392
1393                 return parent::delete( $table, $conds, $fname );
1394         }
1395
1396         /**
1397          * @param string $table
1398          * @param array $values
1399          * @param array $conds
1400          * @param string $fname
1401          * @param array $options
1402          * @return bool
1403          * @throws DBUnexpectedError
1404          */
1405         function update( $table, $values, $conds, $fname = __METHOD__, $options = array() ) {
1406                 global $wgContLang;
1407
1408                 $table = $this->tableName( $table );
1409                 $opts = $this->makeUpdateOptions( $options );
1410                 $sql = "UPDATE $opts $table SET ";
1411
1412                 $first = true;
1413                 foreach ( $values as $col => &$val ) {
1414                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1415
1416                         if ( !$first ) {
1417                                 $sqlSet = ', ' . $sqlSet;
1418                         } else {
1419                                 $first = false;
1420                         }
1421                         $sql .= $sqlSet;
1422                 }
1423
1424                 if ( $conds !== array() && $conds !== '*' ) {
1425                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1426                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1427                 }
1428
1429                 if ( ( $this->mLastResult = $stmt = oci_parse( $this->mConn, $sql ) ) === false ) {
1430                         $e = oci_error( $this->mConn );
1431                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1432
1433                         return false;
1434                 }
1435                 foreach ( $values as $col => &$val ) {
1436                         $col_info = $this->fieldInfoMulti( $table, $col );
1437                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1438
1439                         if ( $val === null ) {
1440                                 // do nothing ... null was inserted in statement creation
1441                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1442                                 if ( is_object( $val ) ) {
1443                                         $val = $val->getData();
1444                                 }
1445
1446                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1447                                         $val = '31-12-2030 12:00:00.000000';
1448                                 }
1449
1450                                 $val = ( $wgContLang != null ) ? $wgContLang->checkTitleEncoding( $val ) : $val;
1451                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1452                                         $e = oci_error( $stmt );
1453                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1454
1455                                         return false;
1456                                 }
1457                         } else {
1458                                 /** @var OCI_Lob[] $lob */
1459                                 if ( ( $lob[$col] = oci_new_descriptor( $this->mConn, OCI_D_LOB ) ) === false ) {
1460                                         $e = oci_error( $stmt );
1461                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1462                                 }
1463
1464                                 if ( $col_type == 'BLOB' ) {
1465                                         $lob[$col]->writeTemporary( $val );
1466                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1467                                 } else {
1468                                         $lob[$col]->writeTemporary( $val );
1469                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1470                                 }
1471                         }
1472                 }
1473
1474                 wfSuppressWarnings();
1475
1476                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1477                         $e = oci_error( $stmt );
1478                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1479                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1480
1481                                 return false;
1482                         } else {
1483                                 $this->mAffectedRows = oci_num_rows( $stmt );
1484                         }
1485                 } else {
1486                         $this->mAffectedRows = oci_num_rows( $stmt );
1487                 }
1488
1489                 wfRestoreWarnings();
1490
1491                 if ( isset( $lob ) ) {
1492                         foreach ( $lob as $lob_v ) {
1493                                 $lob_v->free();
1494                         }
1495                 }
1496
1497                 if ( !$this->mTrxLevel ) {
1498                         oci_commit( $this->mConn );
1499                 }
1500
1501                 return oci_free_statement( $stmt );
1502         }
1503
1504         function bitNot( $field ) {
1505                 // expecting bit-fields smaller than 4bytes
1506                 return 'BITNOT(' . $field . ')';
1507         }
1508
1509         function bitAnd( $fieldLeft, $fieldRight ) {
1510                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1511         }
1512
1513         function bitOr( $fieldLeft, $fieldRight ) {
1514                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1515         }
1516
1517         function getDBname() {
1518                 return $this->mDBname;
1519         }
1520
1521         function getServer() {
1522                 return $this->mServer;
1523         }
1524
1525         public function buildGroupConcatField(
1526                 $delim, $table, $field, $conds = '', $join_conds = array()
1527         ) {
1528                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1529
1530                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, array(), $join_conds ) . ')';
1531         }
1532
1533         public function getSearchEngine() {
1534                 return 'SearchOracle';
1535         }
1536
1537         public function getInfinity() {
1538                 return '31-12-2030 12:00:00.000000';
1539         }
1540 }