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 use MediaWiki\MediaWikiServices;
  25 use Wikimedia\Rdbms\Database;
  26 use Wikimedia\Rdbms\DatabaseDomain;
  27 use Wikimedia\Rdbms\Blob;
  28 use Wikimedia\Rdbms\ResultWrapper;
  29 use Wikimedia\Rdbms\DBConnectionError;
  30 use Wikimedia\Rdbms\DBUnexpectedError;
  31 use Wikimedia\Rdbms\DBExpectedError;
  32
  33 /**
  34  * @ingroup Database
  35  */
  36 class DatabaseOracle extends Database {
  37         /** @var resource */
  38         protected $mLastResult = null;
  39
  40         /** @var int The number of rows affected as an integer */
  41         protected $mAffectedRows;
  42
  43         /** @var bool */
  44         private $ignoreDupValOnIndex = false;
  45
  46         /** @var bool|array */
  47         private $sequenceData = null;
  48
  49         /** @var string Character set for Oracle database */
  50         private $defaultCharset = 'AL32UTF8';
  51
  52         /** @var array */
  53         private $mFieldInfoCache = [];
  54
  55         function __construct( array $p ) {
  56                 global $wgDBprefix;
  57
  58                 if ( $p['tablePrefix'] == 'get from global' ) {
  59                         $p['tablePrefix'] = $wgDBprefix;
  60                 }
  61                 $p['tablePrefix'] = strtoupper( $p['tablePrefix'] );
  62                 parent::__construct( $p );
  63                 Hooks::run( 'DatabaseOraclePostInit', [ $this ] );
  64         }
  65
  66         function __destruct() {
  67                 if ( $this->opened ) {
  68                         Wikimedia\suppressWarnings();
  69                         $this->close();
  70                         Wikimedia\restoreWarnings();
  71                 }
  72         }
  73
  74         function getType() {
  75                 return 'oracle';
  76         }
  77
  78         function implicitGroupby() {
  79                 return false;
  80         }
  81
  82         function implicitOrderby() {
  83                 return false;
  84         }
  85
  86         protected function open( $server, $user, $password, $dbName, $schema, $tablePrefix ) {
  87                 global $wgDBOracleDRCP;
  88
  89                 if ( !function_exists( 'oci_connect' ) ) {
  90                         throw new DBConnectionError(
  91                                 $this,
  92                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
  93                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
  94                                         "and database)\n" );
  95                 }
  96
  97                 $this->close();
  98                 $this->user = $user;
  99                 $this->password = $password;
 100                 if ( !$server ) {
 101                         // Backward compatibility (server used to be null and TNS was supplied in dbname)
 102                         $this->server = $dbName;
 103                         $realDatabase = $user;
 104                 } else {
 105                         // $server now holds the TNS endpoint
 106                         $this->server = $server;
 107                         // $dbName is schema name if different from username
 108                         $realDatabase = $dbName ?: $user;
 109                 }
 110
 111                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 112                         return null;
 113                 }
 114
 115                 if ( $wgDBOracleDRCP ) {
 116                         $this->setFlag( DBO_PERSISTENT );
 117                 }
 118
 119                 $session_mode = $this->flags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 120
 121                 Wikimedia\suppressWarnings();
 122                 if ( $this->flags & DBO_PERSISTENT ) {
 123                         $this->conn = oci_pconnect(
 124                                 $this->user,
 125                                 $this->password,
 126                                 $this->server,
 127                                 $this->defaultCharset,
 128                                 $session_mode
 129                         );
 130                 } elseif ( $this->flags & DBO_DEFAULT ) {
 131                         $this->conn = oci_new_connect(
 132                                 $this->user,
 133                                 $this->password,
 134                                 $this->server,
 135                                 $this->defaultCharset,
 136                                 $session_mode
 137                         );
 138                 } else {
 139                         $this->conn = oci_connect(
 140                                 $this->user,
 141                                 $this->password,
 142                                 $this->server,
 143                                 $this->defaultCharset,
 144                                 $session_mode
 145                         );
 146                 }
 147                 Wikimedia\restoreWarnings();
 148
 149                 if ( $this->user != $realDatabase ) {
 150                         // change current schema in session
 151                         $this->selectDB( $realDatabase );
 152                 } else {
 153                         $this->currentDomain = new DatabaseDomain(
 154                                 $realDatabase,
 155                                 null,
 156                                 $tablePrefix
 157                         );
 158                 }
 159
 160                 if ( !$this->conn ) {
 161                         throw new DBConnectionError( $this, $this->lastError() );
 162                 }
 163
 164                 $this->opened = true;
 165
 166                 # removed putenv calls because they interfere with the system globaly
 167                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 168                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 169                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 170
 171                 return (bool)$this->conn;
 172         }
 173
 174         /**
 175          * Closes a database connection, if it is open
 176          * Returns success, true if already closed
 177          * @return bool
 178          */
 179         protected function closeConnection() {
 180                 return oci_close( $this->conn );
 181         }
 182
 183         function execFlags() {
 184                 return $this->trxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 185         }
 186
 187         protected function doQuery( $sql ) {
 188                 wfDebug( "SQL: [$sql]\n" );
 189                 if ( !StringUtils::isUtf8( $sql ) ) {
 190                         throw new InvalidArgumentException( "SQL encoding is invalid\n$sql" );
 191                 }
 192
 193                 // handle some oracle specifics
 194                 // remove AS column/table/subquery namings
 195                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 196                         $sql = preg_replace( '/ as /i', ' ', $sql );
 197                 }
 198
 199                 // Oracle has issues with UNION clause if the statement includes LOB fields
 200                 // So we do a UNION ALL and then filter the results array with array_unique
 201                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 202                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 203                 // you have to select data from plan table after explain
 204                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 205
 206                 $sql = preg_replace(
 207                         '/^EXPLAIN /',
 208                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 209                         $sql,
 210                         1,
 211                         $explain_count
 212                 );
 213
 214                 Wikimedia\suppressWarnings();
 215
 216                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 217                 if ( $stmt === false ) {
 218                         $e = oci_error( $this->conn );
 219                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 220
 221                         return false;
 222                 }
 223
 224                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 225                         $e = oci_error( $stmt );
 226                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 227                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 228
 229                                 return false;
 230                         }
 231                 }
 232
 233                 Wikimedia\restoreWarnings();
 234
 235                 if ( $explain_count > 0 ) {
 236                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 237                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 238                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 239                         return new ORAResult( $this, $stmt, $union_unique );
 240                 } else {
 241                         $this->mAffectedRows = oci_num_rows( $stmt );
 242
 243                         return true;
 244                 }
 245         }
 246
 247         function queryIgnore( $sql, $fname = '' ) {
 248                 return $this->query( $sql, $fname, true );
 249         }
 250
 251         /**
 252          * Frees resources associated with the LOB descriptor
 253          * @param ResultWrapper|ORAResult $res
 254          */
 255         function freeResult( $res ) {
 256                 if ( $res instanceof ResultWrapper ) {
 257                         $res = $res->result;
 258                 }
 259
 260                 $res->free();
 261         }
 262
 263         /**
 264          * @param ResultWrapper|ORAResult $res
 265          * @return mixed
 266          */
 267         function fetchObject( $res ) {
 268                 if ( $res instanceof ResultWrapper ) {
 269                         $res = $res->result;
 270                 }
 271
 272                 return $res->fetchObject();
 273         }
 274
 275         /**
 276          * @param ResultWrapper|ORAResult $res
 277          * @return mixed
 278          */
 279         function fetchRow( $res ) {
 280                 if ( $res instanceof ResultWrapper ) {
 281                         $res = $res->result;
 282                 }
 283
 284                 return $res->fetchRow();
 285         }
 286
 287         /**
 288          * @param ResultWrapper|ORAResult $res
 289          * @return int
 290          */
 291         function numRows( $res ) {
 292                 if ( $res instanceof ResultWrapper ) {
 293                         $res = $res->result;
 294                 }
 295
 296                 return $res->numRows();
 297         }
 298
 299         /**
 300          * @param ResultWrapper|ORAResult $res
 301          * @return int
 302          */
 303         function numFields( $res ) {
 304                 if ( $res instanceof ResultWrapper ) {
 305                         $res = $res->result;
 306                 }
 307
 308                 return $res->numFields();
 309         }
 310
 311         function fieldName( $stmt, $n ) {
 312                 return oci_field_name( $stmt, $n );
 313         }
 314
 315         function insertId() {
 316                 $res = $this->query( "SELECT lastval_pkg.getLastval FROM dual" );
 317                 $row = $this->fetchRow( $res );
 318                 return is_null( $row[0] ) ? null : (int)$row[0];
 319         }
 320
 321         /**
 322          * @param mixed $res
 323          * @param int $row
 324          */
 325         function dataSeek( $res, $row ) {
 326                 if ( $res instanceof ORAResult ) {
 327                         $res->seek( $row );
 328                 } else {
 329                         $res->result->seek( $row );
 330                 }
 331         }
 332
 333         function lastError() {
 334                 if ( $this->conn === false ) {
 335                         $e = oci_error();
 336                 } else {
 337                         $e = oci_error( $this->conn );
 338                 }
 339
 340                 return $e['message'];
 341         }
 342
 343         function lastErrno() {
 344                 if ( $this->conn === false ) {
 345                         $e = oci_error();
 346                 } else {
 347                         $e = oci_error( $this->conn );
 348                 }
 349
 350                 return $e['code'];
 351         }
 352
 353         protected function fetchAffectedRowCount() {
 354                 return $this->mAffectedRows;
 355         }
 356
 357         /**
 358          * Returns information about an index
 359          * If errors are explicitly ignored, returns NULL on failure
 360          * @param string $table
 361          * @param string $index
 362          * @param string $fname
 363          * @return bool
 364          */
 365         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 366                 return false;
 367         }
 368
 369         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 370                 return false;
 371         }
 372
 373         function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 374                 if ( !count( $a ) ) {
 375                         return true;
 376                 }
 377
 378                 if ( !is_array( $options ) ) {
 379                         $options = [ $options ];
 380                 }
 381
 382                 if ( in_array( 'IGNORE', $options ) ) {
 383                         $this->ignoreDupValOnIndex = true;
 384                 }
 385
 386                 if ( !is_array( reset( $a ) ) ) {
 387                         $a = [ $a ];
 388                 }
 389
 390                 foreach ( $a as &$row ) {
 391                         $this->insertOneRow( $table, $row, $fname );
 392                 }
 393                 $retVal = true;
 394
 395                 if ( in_array( 'IGNORE', $options ) ) {
 396                         $this->ignoreDupValOnIndex = false;
 397                 }
 398
 399                 return $retVal;
 400         }
 401
 402         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 403                 $col_info = $this->fieldInfoMulti( $table, $col );
 404                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 405
 406                 $bind = '';
 407                 if ( is_numeric( $col ) ) {
 408                         $bind = $val;
 409                         $val = null;
 410
 411                         return $bind;
 412                 } elseif ( $includeCol ) {
 413                         $bind = "$col = ";
 414                 }
 415
 416                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 417                         $val = null;
 418                 }
 419
 420                 if ( $val === 'NULL' ) {
 421                         $val = null;
 422                 }
 423
 424                 if ( $val === null ) {
 425                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 426                                 $bind .= 'DEFAULT';
 427                         } else {
 428                                 $bind .= 'NULL';
 429                         }
 430                 } else {
 431                         $bind .= ':' . $col;
 432                 }
 433
 434                 return $bind;
 435         }
 436
 437         /**
 438          * @param string $table
 439          * @param array $row
 440          * @param string $fname
 441          * @return bool
 442          * @throws DBUnexpectedError
 443          */
 444         private function insertOneRow( $table, $row, $fname ) {
 445                 $table = $this->tableName( $table );
 446                 // "INSERT INTO tables (a, b, c)"
 447                 $sql = "INSERT INTO " . $table . " (" . implode( ',', array_keys( $row ) ) . ')';
 448                 $sql .= " VALUES (";
 449
 450                 // for each value, append ":key"
 451                 $first = true;
 452                 foreach ( $row as $col => &$val ) {
 453                         if ( !$first ) {
 454                                 $sql .= ', ';
 455                         } else {
 456                                 $first = false;
 457                         }
 458                         if ( $this->isQuotedIdentifier( $val ) ) {
 459                                 $sql .= $this->removeIdentifierQuotes( $val );
 460                                 unset( $row[$col] );
 461                         } else {
 462                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 463                         }
 464                 }
 465                 $sql .= ')';
 466
 467                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 468                 if ( $stmt === false ) {
 469                         $e = oci_error( $this->conn );
 470                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 471
 472                         return false;
 473                 }
 474                 foreach ( $row as $col => &$val ) {
 475                         $col_info = $this->fieldInfoMulti( $table, $col );
 476                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 477
 478                         if ( $val === null ) {
 479                                 // do nothing ... null was inserted in statement creation
 480                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 481                                 if ( is_object( $val ) ) {
 482                                         $val = $val->fetch();
 483                                 }
 484
 485                                 // backward compatibility
 486                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 487                                         $val = $this->getInfinity();
 488                                 }
 489
 490                                 $val = MediaWikiServices::getInstance()->getContentLanguage()->
 491                                         checkTitleEncoding( $val );
 492                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 493                                         $e = oci_error( $stmt );
 494                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 495
 496                                         return false;
 497                                 }
 498                         } else {
 499                                 /** @var OCI_Lob[] $lob */
 500                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
 501                                 if ( $lob[$col] === false ) {
 502                                         $e = oci_error( $stmt );
 503                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 504                                 }
 505
 506                                 if ( is_object( $val ) ) {
 507                                         $val = $val->fetch();
 508                                 }
 509
 510                                 if ( $col_type == 'BLOB' ) {
 511                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 512                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 513                                 } else {
 514                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 515                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 516                                 }
 517                         }
 518                 }
 519
 520                 Wikimedia\suppressWarnings();
 521
 522                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 523                         $e = oci_error( $stmt );
 524                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 525                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 526
 527                                 return false;
 528                         } else {
 529                                 $this->mAffectedRows = oci_num_rows( $stmt );
 530                         }
 531                 } else {
 532                         $this->mAffectedRows = oci_num_rows( $stmt );
 533                 }
 534
 535                 Wikimedia\restoreWarnings();
 536
 537                 if ( isset( $lob ) ) {
 538                         foreach ( $lob as $lob_v ) {
 539                                 $lob_v->free();
 540                         }
 541                 }
 542
 543                 if ( !$this->trxLevel ) {
 544                         oci_commit( $this->conn );
 545                 }
 546
 547                 return oci_free_statement( $stmt );
 548         }
 549
 550         function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 551                 $insertOptions = [], $selectOptions = [], $selectJoinConds = []
 552         ) {
 553                 $destTable = $this->tableName( $destTable );
 554
 555                 $sequenceData = $this->getSequenceData( $destTable );
 556                 if ( $sequenceData !== false &&
 557                         !isset( $varMap[$sequenceData['column']] )
 558                 ) {
 559                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 560                 }
 561
 562                 // count-alias subselect fields to avoid abigious definition errors
 563                 $i = 0;
 564                 foreach ( $varMap as &$val ) {
 565                         $val = $val . ' field' . ( $i++ );
 566                 }
 567
 568                 $selectSql = $this->selectSQLText(
 569                         $srcTable,
 570                         array_values( $varMap ),
 571                         $conds,
 572                         $fname,
 573                         $selectOptions,
 574                         $selectJoinConds
 575                 );
 576
 577                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ') ' . $selectSql;
 578
 579                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 580                         $this->ignoreDupValOnIndex = true;
 581                 }
 582
 583                 $retval = $this->query( $sql, $fname );
 584
 585                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 586                         $this->ignoreDupValOnIndex = false;
 587                 }
 588
 589                 return $retval;
 590         }
 591
 592         public function upsert( $table, array $rows, array $uniqueIndexes, array $set,
 593                 $fname = __METHOD__
 594         ) {
 595                 if ( !count( $rows ) ) {
 596                         return true; // nothing to do
 597                 }
 598
 599                 if ( !is_array( reset( $rows ) ) ) {
 600                         $rows = [ $rows ];
 601                 }
 602
 603                 $sequenceData = $this->getSequenceData( $table );
 604                 if ( $sequenceData !== false ) {
 605                         // add sequence column to each list of columns, when not set
 606                         foreach ( $rows as &$row ) {
 607                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 608                                         $row[$sequenceData['column']] =
 609                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 610                                                         $sequenceData['sequence'] . '\')' );
 611                                 }
 612                         }
 613                 }
 614
 615                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 616         }
 617
 618         function tableName( $name, $format = 'quoted' ) {
 619                 /*
 620                 Replace reserved words with better ones
 621                 Using uppercase because that's the only way Oracle can handle
 622                 quoted tablenames
 623                 */
 624                 switch ( $name ) {
 625                         case 'user':
 626                                 $name = 'MWUSER';
 627                                 break;
 628                         case 'text':
 629                                 $name = 'PAGECONTENT';
 630                                 break;
 631                 }
 632
 633                 return strtoupper( parent::tableName( $name, $format ) );
 634         }
 635
 636         function tableNameInternal( $name ) {
 637                 $name = $this->tableName( $name );
 638
 639                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 640         }
 641
 642         /**
 643          * Return sequence_name if table has a sequence
 644          *
 645          * @param string $table
 646          * @return bool
 647          */
 648         private function getSequenceData( $table ) {
 649                 if ( $this->sequenceData == null ) {
 650                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 651                                 lower(atc.table_name),
 652                                 lower(atc.column_name)
 653                         FROM all_sequences asq, all_tab_columns atc
 654                         WHERE decode(
 655                                         atc.table_name,
 656                                         '{$this->tablePrefix}MWUSER',
 657                                         '{$this->tablePrefix}USER',
 658                                         atc.table_name
 659                                 ) || '_' ||
 660                                 atc.column_name || '_SEQ' = '{$this->tablePrefix}' || asq.sequence_name
 661                                 AND asq.sequence_owner = upper('{$this->getDBname()}')
 662                                 AND atc.owner = upper('{$this->getDBname()}')" );
 663
 664                         while ( ( $row = $result->fetchRow() ) !== false ) {
 665                                 $this->sequenceData[$row[1]] = [
 666                                         'sequence' => $row[0],
 667                                         'column' => $row[2]
 668                                 ];
 669                         }
 670                 }
 671                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 672
 673                 return $this->sequenceData[$table] ?? false;
 674         }
 675
 676         /**
 677          * Returns the size of a text field, or -1 for "unlimited"
 678          *
 679          * @param string $table
 680          * @param string $field
 681          * @return mixed
 682          */
 683         function textFieldSize( $table, $field ) {
 684                 $fieldInfoData = $this->fieldInfo( $table, $field );
 685
 686                 return $fieldInfoData->maxLength();
 687         }
 688
 689         function limitResult( $sql, $limit, $offset = false ) {
 690                 if ( $offset === false ) {
 691                         $offset = 0;
 692                 }
 693
 694                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 695         }
 696
 697         function encodeBlob( $b ) {
 698                 return new Blob( $b );
 699         }
 700
 701         function decodeBlob( $b ) {
 702                 if ( $b instanceof Blob ) {
 703                         $b = $b->fetch();
 704                 }
 705
 706                 return $b;
 707         }
 708
 709         function unionQueries( $sqls, $all ) {
 710                 $glue = ' UNION ALL ';
 711
 712                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 713                         'FROM (' . implode( $glue, $sqls ) . ')';
 714         }
 715
 716         function wasDeadlock() {
 717                 return $this->lastErrno() == 'OCI-00060';
 718         }
 719
 720         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 721                 $fname = __METHOD__
 722         ) {
 723                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 724
 725                 $newName = strtoupper( $newName );
 726                 $oldName = strtoupper( $oldName );
 727
 728                 $tabName = substr( $newName, strlen( $this->tablePrefix ) );
 729                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 730                 $newPrefix = strtoupper( $this->tablePrefix );
 731
 732                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 733                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 734         }
 735
 736         function listTables( $prefix = null, $fname = __METHOD__ ) {
 737                 $listWhere = '';
 738                 if ( !empty( $prefix ) ) {
 739                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 740                 }
 741
 742                 $owner = strtoupper( $this->getDBname() );
 743                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 744                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 745
 746                 // dirty code ... i know
 747                 $endArray = [];
 748                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 749                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 750                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 751                 $fixedOrderTabs = $endArray;
 752                 while ( ( $row = $result->fetchRow() ) !== false ) {
 753                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 754                                 $endArray[] = $row['table_name'];
 755                         }
 756                 }
 757
 758                 return $endArray;
 759         }
 760
 761         public function dropTable( $tableName, $fName = __METHOD__ ) {
 762                 $tableName = $this->tableName( $tableName );
 763                 if ( !$this->tableExists( $tableName ) ) {
 764                         return false;
 765                 }
 766
 767                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 768         }
 769
 770         function timestamp( $ts = 0 ) {
 771                 return wfTimestamp( TS_ORACLE, $ts );
 772         }
 773
 774         /**
 775          * Return aggregated value function call
 776          *
 777          * @param array $valuedata
 778          * @param string $valuename
 779          * @return mixed
 780          */
 781         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 782                 return $valuedata;
 783         }
 784
 785         /**
 786          * @return string Wikitext of a link to the server software's web site
 787          */
 788         public function getSoftwareLink() {
 789                 return '[{{int:version-db-oracle-url}} Oracle]';
 790         }
 791
 792         /**
 793          * @return string Version information from the database
 794          */
 795         function getServerVersion() {
 796                 // better version number, fallback on driver
 797                 $rset = $this->doQuery(
 798                         'SELECT version FROM product_component_version ' .
 799                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 800                 );
 801                 $row = $rset->fetchRow();
 802                 if ( !$row ) {
 803                         return oci_server_version( $this->conn );
 804                 }
 805
 806                 return $row['version'];
 807         }
 808
 809         /**
 810          * Query whether a given index exists
 811          * @param string $table
 812          * @param string $index
 813          * @param string $fname
 814          * @return bool
 815          */
 816         function indexExists( $table, $index, $fname = __METHOD__ ) {
 817                 $table = $this->tableName( $table );
 818                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 819                 $index = strtoupper( $index );
 820                 $owner = strtoupper( $this->getDBname() );
 821                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 822                 $res = $this->doQuery( $sql );
 823                 if ( $res ) {
 824                         $count = $res->numRows();
 825                         $res->free();
 826                 } else {
 827                         $count = 0;
 828                 }
 829
 830                 return $count != 0;
 831         }
 832
 833         /**
 834          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 835          * @param string $table
 836          * @param string $fname
 837          * @return bool
 838          */
 839         function tableExists( $table, $fname = __METHOD__ ) {
 840                 $table = $this->tableName( $table );
 841                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 842                 $owner = $this->addQuotes( strtoupper( $this->getDBname() ) );
 843                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 844                 $res = $this->doQuery( $sql );
 845                 if ( $res && $res->numRows() > 0 ) {
 846                         $exists = true;
 847                 } else {
 848                         $exists = false;
 849                 }
 850
 851                 $res->free();
 852
 853                 return $exists;
 854         }
 855
 856         /**
 857          * Function translates mysql_fetch_field() functionality on ORACLE.
 858          * Caching is present for reducing query time.
 859          * For internal calls. Use fieldInfo for normal usage.
 860          * Returns false if the field doesn't exist
 861          *
 862          * @param array|string $table
 863          * @param string $field
 864          * @return ORAField|ORAResult|false
 865          */
 866         private function fieldInfoMulti( $table, $field ) {
 867                 $field = strtoupper( $field );
 868                 if ( is_array( $table ) ) {
 869                         $table = array_map( [ $this, 'tableNameInternal' ], $table );
 870                         $tableWhere = 'IN (';
 871                         foreach ( $table as &$singleTable ) {
 872                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
 873                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 874                                         return $this->mFieldInfoCache["$singleTable.$field"];
 875                                 }
 876                                 $tableWhere .= '\'' . $singleTable . '\',';
 877                         }
 878                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 879                 } else {
 880                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
 881                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 882                                 return $this->mFieldInfoCache["$table.$field"];
 883                         }
 884                         $tableWhere = '= \'' . $table . '\'';
 885                 }
 886
 887                 $fieldInfoStmt = oci_parse(
 888                         $this->conn,
 889                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
 890                                 $tableWhere . ' and column_name = \'' . $field . '\''
 891                 );
 892                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 893                         $e = oci_error( $fieldInfoStmt );
 894                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 895
 896                         return false;
 897                 }
 898                 $res = new ORAResult( $this, $fieldInfoStmt );
 899                 if ( $res->numRows() == 0 ) {
 900                         if ( is_array( $table ) ) {
 901                                 foreach ( $table as &$singleTable ) {
 902                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 903                                 }
 904                         } else {
 905                                 $this->mFieldInfoCache["$table.$field"] = false;
 906                         }
 907                         $fieldInfoTemp = null;
 908                 } else {
 909                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 910                         $table = $fieldInfoTemp->tableName();
 911                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 912                 }
 913                 $res->free();
 914
 915                 return $fieldInfoTemp;
 916         }
 917
 918         /**
 919          * @throws DBUnexpectedError
 920          * @param string $table
 921          * @param string $field
 922          * @return ORAField
 923          */
 924         function fieldInfo( $table, $field ) {
 925                 if ( is_array( $table ) ) {
 926                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 927                 }
 928
 929                 return $this->fieldInfoMulti( $table, $field );
 930         }
 931
 932         protected function doBegin( $fname = __METHOD__ ) {
 933                 $this->trxLevel = 1;
 934                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 935         }
 936
 937         protected function doCommit( $fname = __METHOD__ ) {
 938                 if ( $this->trxLevel ) {
 939                         $ret = oci_commit( $this->conn );
 940                         if ( !$ret ) {
 941                                 throw new DBUnexpectedError( $this, $this->lastError() );
 942                         }
 943                         $this->trxLevel = 0;
 944                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 945                 }
 946         }
 947
 948         protected function doRollback( $fname = __METHOD__ ) {
 949                 if ( $this->trxLevel ) {
 950                         oci_rollback( $this->conn );
 951                         $this->trxLevel = 0;
 952                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 953                 }
 954         }
 955
 956         function sourceStream(
 957                 $fp,
 958                 callable $lineCallback = null,
 959                 callable $resultCallback = null,
 960                 $fname = __METHOD__, callable $inputCallback = null
 961         ) {
 962                 $cmd = '';
 963                 $done = false;
 964                 $dollarquote = false;
 965
 966                 $replacements = [];
 967                 // Defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
 968                 while ( !feof( $fp ) ) {
 969                         if ( $lineCallback ) {
 970                                 call_user_func( $lineCallback );
 971                         }
 972                         $line = trim( fgets( $fp, 1024 ) );
 973                         $sl = strlen( $line ) - 1;
 974
 975                         if ( $sl < 0 ) {
 976                                 continue;
 977                         }
 978                         if ( '-' == $line[0] && '-' == $line[1] ) {
 979                                 continue;
 980                         }
 981
 982                         // Allow dollar quoting for function declarations
 983                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 984                                 if ( $dollarquote ) {
 985                                         $dollarquote = false;
 986                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
 987                                         $done = true;
 988                                 } else {
 989                                         $dollarquote = true;
 990                                 }
 991                         } elseif ( !$dollarquote ) {
 992                                 if ( ';' == $line[$sl] && ( $sl < 2 || ';' != $line[$sl - 1] ) ) {
 993                                         $done = true;
 994                                         $line = substr( $line, 0, $sl );
 995                                 }
 996                         }
 997
 998                         if ( $cmd != '' ) {
 999                                 $cmd .= ' ';
1000                         }
1001                         $cmd .= "$line\n";
1002
1003                         if ( $done ) {
1004                                 $cmd = str_replace( ';;', ";", $cmd );
1005                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1006                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1007                                                 $replacements[$defines[2]] = $defines[1];
1008                                         }
1009                                 } else {
1010                                         foreach ( $replacements as $mwVar => $scVar ) {
1011                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1012                                         }
1013
1014                                         $cmd = $this->replaceVars( $cmd );
1015                                         if ( $inputCallback ) {
1016                                                 call_user_func( $inputCallback, $cmd );
1017                                         }
1018                                         $res = $this->doQuery( $cmd );
1019                                         if ( $resultCallback ) {
1020                                                 call_user_func( $resultCallback, $res, $this );
1021                                         }
1022
1023                                         if ( false === $res ) {
1024                                                 $err = $this->lastError();
1025
1026                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1027                                         }
1028                                 }
1029
1030                                 $cmd = '';
1031                                 $done = false;
1032                         }
1033                 }
1034
1035                 return true;
1036         }
1037
1038         protected function doSelectDomain( DatabaseDomain $domain ) {
1039                 if ( $domain->getSchema() !== null ) {
1040                         // We use the *database* aspect of $domain for schema, not the domain schema
1041                         throw new DBExpectedError( $this, __CLASS__ . ": domain schemas are not supported." );
1042                 }
1043
1044                 $database = $domain->getDatabase();
1045                 if ( $database === null || $database === $this->user ) {
1046                         // Backward compatibility
1047                         $this->currentDomain = $domain;
1048
1049                         return true;
1050                 }
1051
1052                 // https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj32268.html
1053                 $encDatabase = $this->addIdentifierQuotes( strtoupper( $database ) );
1054                 $sql = "ALTER SESSION SET CURRENT_SCHEMA=$encDatabase";
1055                 $stmt = oci_parse( $this->conn, $sql );
1056                 Wikimedia\suppressWarnings();
1057                 $success = oci_execute( $stmt );
1058                 Wikimedia\restoreWarnings();
1059                 if ( $success ) {
1060                         // Update that domain fields on success (no exception thrown)
1061                         $this->currentDomain = $domain;
1062                 } else {
1063                         $e = oci_error( $stmt );
1064                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1065                 }
1066
1067                 return true;
1068         }
1069
1070         function strencode( $s ) {
1071                 return str_replace( "'", "''", $s );
1072         }
1073
1074         function addQuotes( $s ) {
1075                 $contLang = MediaWikiServices::getInstance()->getContentLanguage();
1076                 if ( isset( $contLang->mLoaded ) && $contLang->mLoaded ) {
1077                         $s = $contLang->checkTitleEncoding( $s );
1078                 }
1079
1080                 return "'" . $this->strencode( $s ) . "'";
1081         }
1082
1083         public function addIdentifierQuotes( $s ) {
1084                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1085                         $s = '/*Q*/' . $s;
1086                 }
1087
1088                 return $s;
1089         }
1090
1091         public function removeIdentifierQuotes( $s ) {
1092                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1093         }
1094
1095         public function isQuotedIdentifier( $s ) {
1096                 return strpos( $s, '/*Q*/' ) !== false;
1097         }
1098
1099         private function wrapFieldForWhere( $table, &$col, &$val ) {
1100                 $col_info = $this->fieldInfoMulti( $table, $col );
1101                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1102                 if ( $col_type == 'CLOB' ) {
1103                         $col = 'TO_CHAR(' . $col . ')';
1104                         $val =
1105                                 MediaWikiServices::getInstance()->getContentLanguage()->checkTitleEncoding( $val );
1106                 } elseif ( $col_type == 'VARCHAR2' ) {
1107                         $val =
1108                                 MediaWikiServices::getInstance()->getContentLanguage()->checkTitleEncoding( $val );
1109                 }
1110         }
1111
1112         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1113                 $conds2 = [];
1114                 foreach ( $conds as $col => $val ) {
1115                         if ( is_array( $val ) ) {
1116                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1117                         } else {
1118                                 if ( is_numeric( $col ) && $parentCol != null ) {
1119                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1120                                 } else {
1121                                         $this->wrapFieldForWhere( $table, $col, $val );
1122                                 }
1123                                 $conds2[$col] = $val;
1124                         }
1125                 }
1126
1127                 return $conds2;
1128         }
1129
1130         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1131                 $options = [], $join_conds = []
1132         ) {
1133                 if ( is_array( $conds ) ) {
1134                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1135                 }
1136
1137                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1138         }
1139
1140         /**
1141          * Returns an optional USE INDEX clause to go after the table, and a
1142          * string to go at the end of the query
1143          *
1144          * @param array $options An associative array of options to be turned into
1145          *   an SQL query, valid keys are listed in the function.
1146          * @return array
1147          */
1148         function makeSelectOptions( $options ) {
1149                 $preLimitTail = $postLimitTail = '';
1150                 $startOpts = '';
1151
1152                 $noKeyOptions = [];
1153                 foreach ( $options as $key => $option ) {
1154                         if ( is_numeric( $key ) ) {
1155                                 $noKeyOptions[$option] = true;
1156                         }
1157                 }
1158
1159                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1160
1161                 $preLimitTail .= $this->makeOrderBy( $options );
1162
1163                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1164                         $postLimitTail .= ' FOR UPDATE';
1165                 }
1166
1167                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1168                         $startOpts .= 'DISTINCT';
1169                 }
1170
1171                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1172                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1173                 } else {
1174                         $useIndex = '';
1175                 }
1176
1177                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1178                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1179                 } else {
1180                         $ignoreIndex = '';
1181                 }
1182
1183                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1184         }
1185
1186         public function delete( $table, $conds, $fname = __METHOD__ ) {
1187                 global $wgActorTableSchemaMigrationStage;
1188
1189                 if ( is_array( $conds ) ) {
1190                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1191                 }
1192                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1193                 // all deletions on these tables have transactions so final failure rollbacks these updates
1194                 // @todo: Normalize the schema to match MySQL, no special FKs and such
1195                 $table = $this->tableName( $table );
1196                 if ( $table == $this->tableName( 'user' ) &&
1197                         ( $wgActorTableSchemaMigrationStage & SCHEMA_COMPAT_WRITE_OLD )
1198                 ) {
1199                         $this->update( 'archive', [ 'ar_user' => 0 ],
1200                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1201                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1202                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1203                         $this->update( 'image', [ 'img_user' => 0 ],
1204                                 [ 'img_user' => $conds['user_id'] ], $fname );
1205                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1206                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1207                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1208                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1209                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1210                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1211                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1212                                 [ 'us_user' => $conds['user_id'] ], $fname );
1213                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1214                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1215                         $this->update( 'logging', [ 'log_user' => 0 ],
1216                                 [ 'log_user' => $conds['user_id'] ], $fname );
1217                 } elseif ( $table == $this->tableName( 'image' ) ) {
1218                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1219                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1220                 }
1221
1222                 return parent::delete( $table, $conds, $fname );
1223         }
1224
1225         /**
1226          * @param string $table
1227          * @param array $values
1228          * @param array $conds
1229          * @param string $fname
1230          * @param array $options
1231          * @return bool
1232          * @throws DBUnexpectedError
1233          */
1234         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1235                 $table = $this->tableName( $table );
1236                 $opts = $this->makeUpdateOptions( $options );
1237                 $sql = "UPDATE $opts $table SET ";
1238
1239                 $first = true;
1240                 foreach ( $values as $col => &$val ) {
1241                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1242
1243                         if ( !$first ) {
1244                                 $sqlSet = ', ' . $sqlSet;
1245                         } else {
1246                                 $first = false;
1247                         }
1248                         $sql .= $sqlSet;
1249                 }
1250
1251                 if ( $conds !== [] && $conds !== '*' ) {
1252                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1253                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1254                 }
1255
1256                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
1257                 if ( $stmt === false ) {
1258                         $e = oci_error( $this->conn );
1259                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1260
1261                         return false;
1262                 }
1263                 foreach ( $values as $col => &$val ) {
1264                         $col_info = $this->fieldInfoMulti( $table, $col );
1265                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1266
1267                         if ( $val === null ) {
1268                                 // do nothing ... null was inserted in statement creation
1269                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1270                                 if ( is_object( $val ) ) {
1271                                         $val = $val->getData();
1272                                 }
1273
1274                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1275                                         $val = '31-12-2030 12:00:00.000000';
1276                                 }
1277
1278                                 $val = MediaWikiServices::getInstance()->getContentLanguage()->
1279                                         checkTitleEncoding( $val );
1280                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1281                                         $e = oci_error( $stmt );
1282                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1283
1284                                         return false;
1285                                 }
1286                         } else {
1287                                 /** @var OCI_Lob[] $lob */
1288                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
1289                                 if ( $lob[$col] === false ) {
1290                                         $e = oci_error( $stmt );
1291                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1292                                 }
1293
1294                                 if ( is_object( $val ) ) {
1295                                         $val = $val->getData();
1296                                 }
1297
1298                                 if ( $col_type == 'BLOB' ) {
1299                                         $lob[$col]->writeTemporary( $val );
1300                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1301                                 } else {
1302                                         $lob[$col]->writeTemporary( $val );
1303                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1304                                 }
1305                         }
1306                 }
1307
1308                 Wikimedia\suppressWarnings();
1309
1310                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1311                         $e = oci_error( $stmt );
1312                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1313                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1314
1315                                 return false;
1316                         } else {
1317                                 $this->mAffectedRows = oci_num_rows( $stmt );
1318                         }
1319                 } else {
1320                         $this->mAffectedRows = oci_num_rows( $stmt );
1321                 }
1322
1323                 Wikimedia\restoreWarnings();
1324
1325                 if ( isset( $lob ) ) {
1326                         foreach ( $lob as $lob_v ) {
1327                                 $lob_v->free();
1328                         }
1329                 }
1330
1331                 if ( !$this->trxLevel ) {
1332                         oci_commit( $this->conn );
1333                 }
1334
1335                 return oci_free_statement( $stmt );
1336         }
1337
1338         function bitNot( $field ) {
1339                 // expecting bit-fields smaller than 4bytes
1340                 return 'BITNOT(' . $field . ')';
1341         }
1342
1343         function bitAnd( $fieldLeft, $fieldRight ) {
1344                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1345         }
1346
1347         function bitOr( $fieldLeft, $fieldRight ) {
1348                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1349         }
1350
1351         function getServer() {
1352                 return $this->server;
1353         }
1354
1355         public function buildGroupConcatField(
1356                 $delim, $table, $field, $conds = '', $join_conds = []
1357         ) {
1358                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1359
1360                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1361         }
1362
1363         public function buildSubstring( $input, $startPosition, $length = null ) {
1364                 $this->assertBuildSubstringParams( $startPosition, $length );
1365                 $params = [ $input, $startPosition ];
1366                 if ( $length !== null ) {
1367                         $params[] = $length;
1368                 }
1369                 return 'SUBSTR(' . implode( ',', $params ) . ')';
1370         }
1371
1372         /**
1373          * @param string $field Field or column to cast
1374          * @return string
1375          * @since 1.28
1376          */
1377         public function buildStringCast( $field ) {
1378                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1379         }
1380
1381         public function getInfinity() {
1382                 return '31-12-2030 12:00:00.000000';
1383         }
1384 }