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\Blob;
  27 use Wikimedia\Rdbms\ResultWrapper;
  28 use Wikimedia\Rdbms\DBConnectionError;
  29 use Wikimedia\Rdbms\DBUnexpectedError;
  30
  31 /**
  32  * @ingroup Database
  33  */
  34 class DatabaseOracle extends Database {
  35         /** @var resource */
  36         protected $mLastResult = null;
  37
  38         /** @var int The number of rows affected as an integer */
  39         protected $mAffectedRows;
  40
  41         /** @var bool */
  42         private $ignoreDupValOnIndex = false;
  43
  44         /** @var bool|array */
  45         private $sequenceData = null;
  46
  47         /** @var string Character set for Oracle database */
  48         private $defaultCharset = 'AL32UTF8';
  49
  50         /** @var array */
  51         private $mFieldInfoCache = [];
  52
  53         function __construct( array $p ) {
  54                 global $wgDBprefix;
  55
  56                 if ( $p['tablePrefix'] == 'get from global' ) {
  57                         $p['tablePrefix'] = $wgDBprefix;
  58                 }
  59                 $p['tablePrefix'] = strtoupper( $p['tablePrefix'] );
  60                 parent::__construct( $p );
  61                 Hooks::run( 'DatabaseOraclePostInit', [ $this ] );
  62         }
  63
  64         function __destruct() {
  65                 if ( $this->opened ) {
  66                         Wikimedia\suppressWarnings();
  67                         $this->close();
  68                         Wikimedia\restoreWarnings();
  69                 }
  70         }
  71
  72         function getType() {
  73                 return 'oracle';
  74         }
  75
  76         function implicitGroupby() {
  77                 return false;
  78         }
  79
  80         function implicitOrderby() {
  81                 return false;
  82         }
  83
  84         function open( $server, $user, $password, $dbName ) {
  85                 global $wgDBOracleDRCP;
  86                 if ( !function_exists( 'oci_connect' ) ) {
  87                         throw new DBConnectionError(
  88                                 $this,
  89                                 "Oracle functions missing, have you compiled PHP with the --with-oci8 option?\n " .
  90                                         "(Note: if you recently installed PHP, you may need to restart your webserver\n " .
  91                                         "and database)\n" );
  92                 }
  93
  94                 $this->close();
  95                 $this->user = $user;
  96                 $this->password = $password;
  97                 // changed internal variables functions
  98                 // mServer now holds the TNS endpoint
  99                 // mDBname is schema name if different from username
 100                 if ( !$server ) {
 101                         // backward compatibillity (server used to be null and TNS was supplied in dbname)
 102                         $this->server = $dbName;
 103                         $this->dbName = $user;
 104                 } else {
 105                         $this->server = $server;
 106                         if ( !$dbName ) {
 107                                 $this->dbName = $user;
 108                         } else {
 109                                 $this->dbName = $dbName;
 110                         }
 111                 }
 112
 113                 if ( !strlen( $user ) ) { # e.g. the class is being loaded
 114                         return null;
 115                 }
 116
 117                 if ( $wgDBOracleDRCP ) {
 118                         $this->setFlag( DBO_PERSISTENT );
 119                 }
 120
 121                 $session_mode = $this->flags & DBO_SYSDBA ? OCI_SYSDBA : OCI_DEFAULT;
 122
 123                 Wikimedia\suppressWarnings();
 124                 if ( $this->flags & DBO_PERSISTENT ) {
 125                         $this->conn = oci_pconnect(
 126                                 $this->user,
 127                                 $this->password,
 128                                 $this->server,
 129                                 $this->defaultCharset,
 130                                 $session_mode
 131                         );
 132                 } elseif ( $this->flags & DBO_DEFAULT ) {
 133                         $this->conn = oci_new_connect(
 134                                 $this->user,
 135                                 $this->password,
 136                                 $this->server,
 137                                 $this->defaultCharset,
 138                                 $session_mode
 139                         );
 140                 } else {
 141                         $this->conn = oci_connect(
 142                                 $this->user,
 143                                 $this->password,
 144                                 $this->server,
 145                                 $this->defaultCharset,
 146                                 $session_mode
 147                         );
 148                 }
 149                 Wikimedia\restoreWarnings();
 150
 151                 if ( $this->user != $this->dbName ) {
 152                         // change current schema in session
 153                         $this->selectDB( $this->dbName );
 154                 }
 155
 156                 if ( !$this->conn ) {
 157                         throw new DBConnectionError( $this, $this->lastError() );
 158                 }
 159
 160                 $this->opened = true;
 161
 162                 # removed putenv calls because they interfere with the system globaly
 163                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 164                 $this->doQuery( 'ALTER SESSION SET NLS_TIMESTAMP_TZ_FORMAT=\'DD-MM-YYYY HH24:MI:SS.FF6\'' );
 165                 $this->doQuery( 'ALTER SESSION SET NLS_NUMERIC_CHARACTERS=\'.,\'' );
 166
 167                 return (bool)$this->conn;
 168         }
 169
 170         /**
 171          * Closes a database connection, if it is open
 172          * Returns success, true if already closed
 173          * @return bool
 174          */
 175         protected function closeConnection() {
 176                 return oci_close( $this->conn );
 177         }
 178
 179         function execFlags() {
 180                 return $this->trxLevel ? OCI_NO_AUTO_COMMIT : OCI_COMMIT_ON_SUCCESS;
 181         }
 182
 183         protected function doQuery( $sql ) {
 184                 wfDebug( "SQL: [$sql]\n" );
 185                 if ( !StringUtils::isUtf8( $sql ) ) {
 186                         throw new InvalidArgumentException( "SQL encoding is invalid\n$sql" );
 187                 }
 188
 189                 // handle some oracle specifics
 190                 // remove AS column/table/subquery namings
 191                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
 192                         $sql = preg_replace( '/ as /i', ' ', $sql );
 193                 }
 194
 195                 // Oracle has issues with UNION clause if the statement includes LOB fields
 196                 // So we do a UNION ALL and then filter the results array with array_unique
 197                 $union_unique = ( preg_match( '/\/\* UNION_UNIQUE \*\/ /', $sql ) != 0 );
 198                 // EXPLAIN syntax in Oracle is EXPLAIN PLAN FOR and it return nothing
 199                 // you have to select data from plan table after explain
 200                 $explain_id = MWTimestamp::getLocalInstance()->format( 'dmYHis' );
 201
 202                 $sql = preg_replace(
 203                         '/^EXPLAIN /',
 204                         'EXPLAIN PLAN SET STATEMENT_ID = \'' . $explain_id . '\' FOR',
 205                         $sql,
 206                         1,
 207                         $explain_count
 208                 );
 209
 210                 Wikimedia\suppressWarnings();
 211
 212                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 213                 if ( $stmt === false ) {
 214                         $e = oci_error( $this->conn );
 215                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 216
 217                         return false;
 218                 }
 219
 220                 if ( !oci_execute( $stmt, $this->execFlags() ) ) {
 221                         $e = oci_error( $stmt );
 222                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 223                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 224
 225                                 return false;
 226                         }
 227                 }
 228
 229                 Wikimedia\restoreWarnings();
 230
 231                 if ( $explain_count > 0 ) {
 232                         return $this->doQuery( 'SELECT id, cardinality "ROWS" FROM plan_table ' .
 233                                 'WHERE statement_id = \'' . $explain_id . '\'' );
 234                 } elseif ( oci_statement_type( $stmt ) == 'SELECT' ) {
 235                         return new ORAResult( $this, $stmt, $union_unique );
 236                 } else {
 237                         $this->mAffectedRows = oci_num_rows( $stmt );
 238
 239                         return true;
 240                 }
 241         }
 242
 243         function queryIgnore( $sql, $fname = '' ) {
 244                 return $this->query( $sql, $fname, true );
 245         }
 246
 247         /**
 248          * Frees resources associated with the LOB descriptor
 249          * @param ResultWrapper|ORAResult $res
 250          */
 251         function freeResult( $res ) {
 252                 if ( $res instanceof ResultWrapper ) {
 253                         $res = $res->result;
 254                 }
 255
 256                 $res->free();
 257         }
 258
 259         /**
 260          * @param ResultWrapper|ORAResult $res
 261          * @return mixed
 262          */
 263         function fetchObject( $res ) {
 264                 if ( $res instanceof ResultWrapper ) {
 265                         $res = $res->result;
 266                 }
 267
 268                 return $res->fetchObject();
 269         }
 270
 271         /**
 272          * @param ResultWrapper|ORAResult $res
 273          * @return mixed
 274          */
 275         function fetchRow( $res ) {
 276                 if ( $res instanceof ResultWrapper ) {
 277                         $res = $res->result;
 278                 }
 279
 280                 return $res->fetchRow();
 281         }
 282
 283         /**
 284          * @param ResultWrapper|ORAResult $res
 285          * @return int
 286          */
 287         function numRows( $res ) {
 288                 if ( $res instanceof ResultWrapper ) {
 289                         $res = $res->result;
 290                 }
 291
 292                 return $res->numRows();
 293         }
 294
 295         /**
 296          * @param ResultWrapper|ORAResult $res
 297          * @return int
 298          */
 299         function numFields( $res ) {
 300                 if ( $res instanceof ResultWrapper ) {
 301                         $res = $res->result;
 302                 }
 303
 304                 return $res->numFields();
 305         }
 306
 307         function fieldName( $stmt, $n ) {
 308                 return oci_field_name( $stmt, $n );
 309         }
 310
 311         function insertId() {
 312                 $res = $this->query( "SELECT lastval_pkg.getLastval FROM dual" );
 313                 $row = $this->fetchRow( $res );
 314                 return is_null( $row[0] ) ? null : (int)$row[0];
 315         }
 316
 317         /**
 318          * @param mixed $res
 319          * @param int $row
 320          */
 321         function dataSeek( $res, $row ) {
 322                 if ( $res instanceof ORAResult ) {
 323                         $res->seek( $row );
 324                 } else {
 325                         $res->result->seek( $row );
 326                 }
 327         }
 328
 329         function lastError() {
 330                 if ( $this->conn === false ) {
 331                         $e = oci_error();
 332                 } else {
 333                         $e = oci_error( $this->conn );
 334                 }
 335
 336                 return $e['message'];
 337         }
 338
 339         function lastErrno() {
 340                 if ( $this->conn === false ) {
 341                         $e = oci_error();
 342                 } else {
 343                         $e = oci_error( $this->conn );
 344                 }
 345
 346                 return $e['code'];
 347         }
 348
 349         protected function fetchAffectedRowCount() {
 350                 return $this->mAffectedRows;
 351         }
 352
 353         /**
 354          * Returns information about an index
 355          * If errors are explicitly ignored, returns NULL on failure
 356          * @param string $table
 357          * @param string $index
 358          * @param string $fname
 359          * @return bool
 360          */
 361         function indexInfo( $table, $index, $fname = __METHOD__ ) {
 362                 return false;
 363         }
 364
 365         function indexUnique( $table, $index, $fname = __METHOD__ ) {
 366                 return false;
 367         }
 368
 369         function insert( $table, $a, $fname = __METHOD__, $options = [] ) {
 370                 if ( !count( $a ) ) {
 371                         return true;
 372                 }
 373
 374                 if ( !is_array( $options ) ) {
 375                         $options = [ $options ];
 376                 }
 377
 378                 if ( in_array( 'IGNORE', $options ) ) {
 379                         $this->ignoreDupValOnIndex = true;
 380                 }
 381
 382                 if ( !is_array( reset( $a ) ) ) {
 383                         $a = [ $a ];
 384                 }
 385
 386                 foreach ( $a as &$row ) {
 387                         $this->insertOneRow( $table, $row, $fname );
 388                 }
 389                 $retVal = true;
 390
 391                 if ( in_array( 'IGNORE', $options ) ) {
 392                         $this->ignoreDupValOnIndex = false;
 393                 }
 394
 395                 return $retVal;
 396         }
 397
 398         private function fieldBindStatement( $table, $col, &$val, $includeCol = false ) {
 399                 $col_info = $this->fieldInfoMulti( $table, $col );
 400                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 401
 402                 $bind = '';
 403                 if ( is_numeric( $col ) ) {
 404                         $bind = $val;
 405                         $val = null;
 406
 407                         return $bind;
 408                 } elseif ( $includeCol ) {
 409                         $bind = "$col = ";
 410                 }
 411
 412                 if ( $val == '' && $val !== 0 && $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 413                         $val = null;
 414                 }
 415
 416                 if ( $val === 'NULL' ) {
 417                         $val = null;
 418                 }
 419
 420                 if ( $val === null ) {
 421                         if ( $col_info != false && $col_info->isNullable() == 0 && $col_info->defaultValue() != null ) {
 422                                 $bind .= 'DEFAULT';
 423                         } else {
 424                                 $bind .= 'NULL';
 425                         }
 426                 } else {
 427                         $bind .= ':' . $col;
 428                 }
 429
 430                 return $bind;
 431         }
 432
 433         /**
 434          * @param string $table
 435          * @param array $row
 436          * @param string $fname
 437          * @return bool
 438          * @throws DBUnexpectedError
 439          */
 440         private function insertOneRow( $table, $row, $fname ) {
 441                 $table = $this->tableName( $table );
 442                 // "INSERT INTO tables (a, b, c)"
 443                 $sql = "INSERT INTO " . $table . " (" . implode( ',', array_keys( $row ) ) . ')';
 444                 $sql .= " VALUES (";
 445
 446                 // for each value, append ":key"
 447                 $first = true;
 448                 foreach ( $row as $col => &$val ) {
 449                         if ( !$first ) {
 450                                 $sql .= ', ';
 451                         } else {
 452                                 $first = false;
 453                         }
 454                         if ( $this->isQuotedIdentifier( $val ) ) {
 455                                 $sql .= $this->removeIdentifierQuotes( $val );
 456                                 unset( $row[$col] );
 457                         } else {
 458                                 $sql .= $this->fieldBindStatement( $table, $col, $val );
 459                         }
 460                 }
 461                 $sql .= ')';
 462
 463                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
 464                 if ( $stmt === false ) {
 465                         $e = oci_error( $this->conn );
 466                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 467
 468                         return false;
 469                 }
 470                 foreach ( $row as $col => &$val ) {
 471                         $col_info = $this->fieldInfoMulti( $table, $col );
 472                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
 473
 474                         if ( $val === null ) {
 475                                 // do nothing ... null was inserted in statement creation
 476                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
 477                                 if ( is_object( $val ) ) {
 478                                         $val = $val->fetch();
 479                                 }
 480
 481                                 // backward compatibility
 482                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
 483                                         $val = $this->getInfinity();
 484                                 }
 485
 486                                 $val = MediaWikiServices::getInstance()->getContentLanguage()->
 487                                         checkTitleEncoding( $val );
 488                                 if ( oci_bind_by_name( $stmt, ":$col", $val, -1, SQLT_CHR ) === false ) {
 489                                         $e = oci_error( $stmt );
 490                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 491
 492                                         return false;
 493                                 }
 494                         } else {
 495                                 /** @var OCI_Lob[] $lob */
 496                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
 497                                 if ( $lob[$col] === false ) {
 498                                         $e = oci_error( $stmt );
 499                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
 500                                 }
 501
 502                                 if ( is_object( $val ) ) {
 503                                         $val = $val->fetch();
 504                                 }
 505
 506                                 if ( $col_type == 'BLOB' ) {
 507                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_BLOB );
 508                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_BLOB );
 509                                 } else {
 510                                         $lob[$col]->writeTemporary( $val, OCI_TEMP_CLOB );
 511                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
 512                                 }
 513                         }
 514                 }
 515
 516                 Wikimedia\suppressWarnings();
 517
 518                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
 519                         $e = oci_error( $stmt );
 520                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
 521                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
 522
 523                                 return false;
 524                         } else {
 525                                 $this->mAffectedRows = oci_num_rows( $stmt );
 526                         }
 527                 } else {
 528                         $this->mAffectedRows = oci_num_rows( $stmt );
 529                 }
 530
 531                 Wikimedia\restoreWarnings();
 532
 533                 if ( isset( $lob ) ) {
 534                         foreach ( $lob as $lob_v ) {
 535                                 $lob_v->free();
 536                         }
 537                 }
 538
 539                 if ( !$this->trxLevel ) {
 540                         oci_commit( $this->conn );
 541                 }
 542
 543                 return oci_free_statement( $stmt );
 544         }
 545
 546         function nativeInsertSelect( $destTable, $srcTable, $varMap, $conds, $fname = __METHOD__,
 547                 $insertOptions = [], $selectOptions = [], $selectJoinConds = []
 548         ) {
 549                 $destTable = $this->tableName( $destTable );
 550
 551                 $sequenceData = $this->getSequenceData( $destTable );
 552                 if ( $sequenceData !== false &&
 553                         !isset( $varMap[$sequenceData['column']] )
 554                 ) {
 555                         $varMap[$sequenceData['column']] = 'GET_SEQUENCE_VALUE(\'' . $sequenceData['sequence'] . '\')';
 556                 }
 557
 558                 // count-alias subselect fields to avoid abigious definition errors
 559                 $i = 0;
 560                 foreach ( $varMap as &$val ) {
 561                         $val = $val . ' field' . ( $i++ );
 562                 }
 563
 564                 $selectSql = $this->selectSQLText(
 565                         $srcTable,
 566                         array_values( $varMap ),
 567                         $conds,
 568                         $fname,
 569                         $selectOptions,
 570                         $selectJoinConds
 571                 );
 572
 573                 $sql = "INSERT INTO $destTable (" . implode( ',', array_keys( $varMap ) ) . ') ' . $selectSql;
 574
 575                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 576                         $this->ignoreDupValOnIndex = true;
 577                 }
 578
 579                 $retval = $this->query( $sql, $fname );
 580
 581                 if ( in_array( 'IGNORE', $insertOptions ) ) {
 582                         $this->ignoreDupValOnIndex = false;
 583                 }
 584
 585                 return $retval;
 586         }
 587
 588         public function upsert( $table, array $rows, array $uniqueIndexes, array $set,
 589                 $fname = __METHOD__
 590         ) {
 591                 if ( !count( $rows ) ) {
 592                         return true; // nothing to do
 593                 }
 594
 595                 if ( !is_array( reset( $rows ) ) ) {
 596                         $rows = [ $rows ];
 597                 }
 598
 599                 $sequenceData = $this->getSequenceData( $table );
 600                 if ( $sequenceData !== false ) {
 601                         // add sequence column to each list of columns, when not set
 602                         foreach ( $rows as &$row ) {
 603                                 if ( !isset( $row[$sequenceData['column']] ) ) {
 604                                         $row[$sequenceData['column']] =
 605                                                 $this->addIdentifierQuotes( 'GET_SEQUENCE_VALUE(\'' .
 606                                                         $sequenceData['sequence'] . '\')' );
 607                                 }
 608                         }
 609                 }
 610
 611                 return parent::upsert( $table, $rows, $uniqueIndexes, $set, $fname );
 612         }
 613
 614         function tableName( $name, $format = 'quoted' ) {
 615                 /*
 616                 Replace reserved words with better ones
 617                 Using uppercase because that's the only way Oracle can handle
 618                 quoted tablenames
 619                 */
 620                 switch ( $name ) {
 621                         case 'user':
 622                                 $name = 'MWUSER';
 623                                 break;
 624                         case 'text':
 625                                 $name = 'PAGECONTENT';
 626                                 break;
 627                 }
 628
 629                 return strtoupper( parent::tableName( $name, $format ) );
 630         }
 631
 632         function tableNameInternal( $name ) {
 633                 $name = $this->tableName( $name );
 634
 635                 return preg_replace( '/.*\.(.*)/', '$1', $name );
 636         }
 637
 638         /**
 639          * Return sequence_name if table has a sequence
 640          *
 641          * @param string $table
 642          * @return bool
 643          */
 644         private function getSequenceData( $table ) {
 645                 if ( $this->sequenceData == null ) {
 646                         $result = $this->doQuery( "SELECT lower(asq.sequence_name),
 647                                 lower(atc.table_name),
 648                                 lower(atc.column_name)
 649                         FROM all_sequences asq, all_tab_columns atc
 650                         WHERE decode(
 651                                         atc.table_name,
 652                                         '{$this->tablePrefix}MWUSER',
 653                                         '{$this->tablePrefix}USER',
 654                                         atc.table_name
 655                                 ) || '_' ||
 656                                 atc.column_name || '_SEQ' = '{$this->tablePrefix}' || asq.sequence_name
 657                                 AND asq.sequence_owner = upper('{$this->dbName}')
 658                                 AND atc.owner = upper('{$this->dbName}')" );
 659
 660                         while ( ( $row = $result->fetchRow() ) !== false ) {
 661                                 $this->sequenceData[$row[1]] = [
 662                                         'sequence' => $row[0],
 663                                         'column' => $row[2]
 664                                 ];
 665                         }
 666                 }
 667                 $table = strtolower( $this->removeIdentifierQuotes( $this->tableName( $table ) ) );
 668
 669                 return $this->sequenceData[$table] ?? false;
 670         }
 671
 672         /**
 673          * Returns the size of a text field, or -1 for "unlimited"
 674          *
 675          * @param string $table
 676          * @param string $field
 677          * @return mixed
 678          */
 679         function textFieldSize( $table, $field ) {
 680                 $fieldInfoData = $this->fieldInfo( $table, $field );
 681
 682                 return $fieldInfoData->maxLength();
 683         }
 684
 685         function limitResult( $sql, $limit, $offset = false ) {
 686                 if ( $offset === false ) {
 687                         $offset = 0;
 688                 }
 689
 690                 return "SELECT * FROM ($sql) WHERE rownum >= (1 + $offset) AND rownum < (1 + $limit + $offset)";
 691         }
 692
 693         function encodeBlob( $b ) {
 694                 return new Blob( $b );
 695         }
 696
 697         function decodeBlob( $b ) {
 698                 if ( $b instanceof Blob ) {
 699                         $b = $b->fetch();
 700                 }
 701
 702                 return $b;
 703         }
 704
 705         function unionQueries( $sqls, $all ) {
 706                 $glue = ' UNION ALL ';
 707
 708                 return 'SELECT * ' . ( $all ? '' : '/* UNION_UNIQUE */ ' ) .
 709                         'FROM (' . implode( $glue, $sqls ) . ')';
 710         }
 711
 712         function wasDeadlock() {
 713                 return $this->lastErrno() == 'OCI-00060';
 714         }
 715
 716         function duplicateTableStructure( $oldName, $newName, $temporary = false,
 717                 $fname = __METHOD__
 718         ) {
 719                 $temporary = $temporary ? 'TRUE' : 'FALSE';
 720
 721                 $newName = strtoupper( $newName );
 722                 $oldName = strtoupper( $oldName );
 723
 724                 $tabName = substr( $newName, strlen( $this->tablePrefix ) );
 725                 $oldPrefix = substr( $oldName, 0, strlen( $oldName ) - strlen( $tabName ) );
 726                 $newPrefix = strtoupper( $this->tablePrefix );
 727
 728                 return $this->doQuery( "BEGIN DUPLICATE_TABLE( '$tabName', " .
 729                         "'$oldPrefix', '$newPrefix', $temporary ); END;" );
 730         }
 731
 732         function listTables( $prefix = null, $fname = __METHOD__ ) {
 733                 $listWhere = '';
 734                 if ( !empty( $prefix ) ) {
 735                         $listWhere = ' AND table_name LIKE \'' . strtoupper( $prefix ) . '%\'';
 736                 }
 737
 738                 $owner = strtoupper( $this->dbName );
 739                 $result = $this->doQuery( "SELECT table_name FROM all_tables " .
 740                         "WHERE owner='$owner' AND table_name NOT LIKE '%!_IDX\$_' ESCAPE '!' $listWhere" );
 741
 742                 // dirty code ... i know
 743                 $endArray = [];
 744                 $endArray[] = strtoupper( $prefix . 'MWUSER' );
 745                 $endArray[] = strtoupper( $prefix . 'PAGE' );
 746                 $endArray[] = strtoupper( $prefix . 'IMAGE' );
 747                 $fixedOrderTabs = $endArray;
 748                 while ( ( $row = $result->fetchRow() ) !== false ) {
 749                         if ( !in_array( $row['table_name'], $fixedOrderTabs ) ) {
 750                                 $endArray[] = $row['table_name'];
 751                         }
 752                 }
 753
 754                 return $endArray;
 755         }
 756
 757         public function dropTable( $tableName, $fName = __METHOD__ ) {
 758                 $tableName = $this->tableName( $tableName );
 759                 if ( !$this->tableExists( $tableName ) ) {
 760                         return false;
 761                 }
 762
 763                 return $this->doQuery( "DROP TABLE $tableName CASCADE CONSTRAINTS PURGE" );
 764         }
 765
 766         function timestamp( $ts = 0 ) {
 767                 return wfTimestamp( TS_ORACLE, $ts );
 768         }
 769
 770         /**
 771          * Return aggregated value function call
 772          *
 773          * @param array $valuedata
 774          * @param string $valuename
 775          * @return mixed
 776          */
 777         public function aggregateValue( $valuedata, $valuename = 'value' ) {
 778                 return $valuedata;
 779         }
 780
 781         /**
 782          * @return string Wikitext of a link to the server software's web site
 783          */
 784         public function getSoftwareLink() {
 785                 return '[{{int:version-db-oracle-url}} Oracle]';
 786         }
 787
 788         /**
 789          * @return string Version information from the database
 790          */
 791         function getServerVersion() {
 792                 // better version number, fallback on driver
 793                 $rset = $this->doQuery(
 794                         'SELECT version FROM product_component_version ' .
 795                                 'WHERE UPPER(product) LIKE \'ORACLE DATABASE%\''
 796                 );
 797                 $row = $rset->fetchRow();
 798                 if ( !$row ) {
 799                         return oci_server_version( $this->conn );
 800                 }
 801
 802                 return $row['version'];
 803         }
 804
 805         /**
 806          * Query whether a given index exists
 807          * @param string $table
 808          * @param string $index
 809          * @param string $fname
 810          * @return bool
 811          */
 812         function indexExists( $table, $index, $fname = __METHOD__ ) {
 813                 $table = $this->tableName( $table );
 814                 $table = strtoupper( $this->removeIdentifierQuotes( $table ) );
 815                 $index = strtoupper( $index );
 816                 $owner = strtoupper( $this->dbName );
 817                 $sql = "SELECT 1 FROM all_indexes WHERE owner='$owner' AND index_name='{$table}_{$index}'";
 818                 $res = $this->doQuery( $sql );
 819                 if ( $res ) {
 820                         $count = $res->numRows();
 821                         $res->free();
 822                 } else {
 823                         $count = 0;
 824                 }
 825
 826                 return $count != 0;
 827         }
 828
 829         /**
 830          * Query whether a given table exists (in the given schema, or the default mw one if not given)
 831          * @param string $table
 832          * @param string $fname
 833          * @return bool
 834          */
 835         function tableExists( $table, $fname = __METHOD__ ) {
 836                 $table = $this->tableName( $table );
 837                 $table = $this->addQuotes( strtoupper( $this->removeIdentifierQuotes( $table ) ) );
 838                 $owner = $this->addQuotes( strtoupper( $this->dbName ) );
 839                 $sql = "SELECT 1 FROM all_tables WHERE owner=$owner AND table_name=$table";
 840                 $res = $this->doQuery( $sql );
 841                 if ( $res && $res->numRows() > 0 ) {
 842                         $exists = true;
 843                 } else {
 844                         $exists = false;
 845                 }
 846
 847                 $res->free();
 848
 849                 return $exists;
 850         }
 851
 852         /**
 853          * Function translates mysql_fetch_field() functionality on ORACLE.
 854          * Caching is present for reducing query time.
 855          * For internal calls. Use fieldInfo for normal usage.
 856          * Returns false if the field doesn't exist
 857          *
 858          * @param array|string $table
 859          * @param string $field
 860          * @return ORAField|ORAResult|false
 861          */
 862         private function fieldInfoMulti( $table, $field ) {
 863                 $field = strtoupper( $field );
 864                 if ( is_array( $table ) ) {
 865                         $table = array_map( [ $this, 'tableNameInternal' ], $table );
 866                         $tableWhere = 'IN (';
 867                         foreach ( $table as &$singleTable ) {
 868                                 $singleTable = $this->removeIdentifierQuotes( $singleTable );
 869                                 if ( isset( $this->mFieldInfoCache["$singleTable.$field"] ) ) {
 870                                         return $this->mFieldInfoCache["$singleTable.$field"];
 871                                 }
 872                                 $tableWhere .= '\'' . $singleTable . '\',';
 873                         }
 874                         $tableWhere = rtrim( $tableWhere, ',' ) . ')';
 875                 } else {
 876                         $table = $this->removeIdentifierQuotes( $this->tableNameInternal( $table ) );
 877                         if ( isset( $this->mFieldInfoCache["$table.$field"] ) ) {
 878                                 return $this->mFieldInfoCache["$table.$field"];
 879                         }
 880                         $tableWhere = '= \'' . $table . '\'';
 881                 }
 882
 883                 $fieldInfoStmt = oci_parse(
 884                         $this->conn,
 885                         'SELECT * FROM wiki_field_info_full WHERE table_name ' .
 886                                 $tableWhere . ' and column_name = \'' . $field . '\''
 887                 );
 888                 if ( oci_execute( $fieldInfoStmt, $this->execFlags() ) === false ) {
 889                         $e = oci_error( $fieldInfoStmt );
 890                         $this->reportQueryError( $e['message'], $e['code'], 'fieldInfo QUERY', __METHOD__ );
 891
 892                         return false;
 893                 }
 894                 $res = new ORAResult( $this, $fieldInfoStmt );
 895                 if ( $res->numRows() == 0 ) {
 896                         if ( is_array( $table ) ) {
 897                                 foreach ( $table as &$singleTable ) {
 898                                         $this->mFieldInfoCache["$singleTable.$field"] = false;
 899                                 }
 900                         } else {
 901                                 $this->mFieldInfoCache["$table.$field"] = false;
 902                         }
 903                         $fieldInfoTemp = null;
 904                 } else {
 905                         $fieldInfoTemp = new ORAField( $res->fetchRow() );
 906                         $table = $fieldInfoTemp->tableName();
 907                         $this->mFieldInfoCache["$table.$field"] = $fieldInfoTemp;
 908                 }
 909                 $res->free();
 910
 911                 return $fieldInfoTemp;
 912         }
 913
 914         /**
 915          * @throws DBUnexpectedError
 916          * @param string $table
 917          * @param string $field
 918          * @return ORAField
 919          */
 920         function fieldInfo( $table, $field ) {
 921                 if ( is_array( $table ) ) {
 922                         throw new DBUnexpectedError( $this, 'DatabaseOracle::fieldInfo called with table array!' );
 923                 }
 924
 925                 return $this->fieldInfoMulti( $table, $field );
 926         }
 927
 928         protected function doBegin( $fname = __METHOD__ ) {
 929                 $this->trxLevel = 1;
 930                 $this->doQuery( 'SET CONSTRAINTS ALL DEFERRED' );
 931         }
 932
 933         protected function doCommit( $fname = __METHOD__ ) {
 934                 if ( $this->trxLevel ) {
 935                         $ret = oci_commit( $this->conn );
 936                         if ( !$ret ) {
 937                                 throw new DBUnexpectedError( $this, $this->lastError() );
 938                         }
 939                         $this->trxLevel = 0;
 940                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 941                 }
 942         }
 943
 944         protected function doRollback( $fname = __METHOD__ ) {
 945                 if ( $this->trxLevel ) {
 946                         oci_rollback( $this->conn );
 947                         $this->trxLevel = 0;
 948                         $this->doQuery( 'SET CONSTRAINTS ALL IMMEDIATE' );
 949                 }
 950         }
 951
 952         function sourceStream(
 953                 $fp,
 954                 callable $lineCallback = null,
 955                 callable $resultCallback = null,
 956                 $fname = __METHOD__, callable $inputCallback = null
 957         ) {
 958                 $cmd = '';
 959                 $done = false;
 960                 $dollarquote = false;
 961
 962                 $replacements = [];
 963                 // Defines must comply with ^define\s*([^\s=]*)\s*=\s?'\{\$([^\}]*)\}';
 964                 while ( !feof( $fp ) ) {
 965                         if ( $lineCallback ) {
 966                                 call_user_func( $lineCallback );
 967                         }
 968                         $line = trim( fgets( $fp, 1024 ) );
 969                         $sl = strlen( $line ) - 1;
 970
 971                         if ( $sl < 0 ) {
 972                                 continue;
 973                         }
 974                         if ( '-' == $line[0] && '-' == $line[1] ) {
 975                                 continue;
 976                         }
 977
 978                         // Allow dollar quoting for function declarations
 979                         if ( substr( $line, 0, 8 ) == '/*$mw$*/' ) {
 980                                 if ( $dollarquote ) {
 981                                         $dollarquote = false;
 982                                         $line = str_replace( '/*$mw$*/', '', $line ); // remove dollarquotes
 983                                         $done = true;
 984                                 } else {
 985                                         $dollarquote = true;
 986                                 }
 987                         } elseif ( !$dollarquote ) {
 988                                 if ( ';' == $line[$sl] && ( $sl < 2 || ';' != $line[$sl - 1] ) ) {
 989                                         $done = true;
 990                                         $line = substr( $line, 0, $sl );
 991                                 }
 992                         }
 993
 994                         if ( $cmd != '' ) {
 995                                 $cmd .= ' ';
 996                         }
 997                         $cmd .= "$line\n";
 998
 999                         if ( $done ) {
1000                                 $cmd = str_replace( ';;', ";", $cmd );
1001                                 if ( strtolower( substr( $cmd, 0, 6 ) ) == 'define' ) {
1002                                         if ( preg_match( '/^define\s*([^\s=]*)\s*=\s*\'\{\$([^\}]*)\}\'/', $cmd, $defines ) ) {
1003                                                 $replacements[$defines[2]] = $defines[1];
1004                                         }
1005                                 } else {
1006                                         foreach ( $replacements as $mwVar => $scVar ) {
1007                                                 $cmd = str_replace( '&' . $scVar . '.', '`{$' . $mwVar . '}`', $cmd );
1008                                         }
1009
1010                                         $cmd = $this->replaceVars( $cmd );
1011                                         if ( $inputCallback ) {
1012                                                 call_user_func( $inputCallback, $cmd );
1013                                         }
1014                                         $res = $this->doQuery( $cmd );
1015                                         if ( $resultCallback ) {
1016                                                 call_user_func( $resultCallback, $res, $this );
1017                                         }
1018
1019                                         if ( false === $res ) {
1020                                                 $err = $this->lastError();
1021
1022                                                 return "Query \"{$cmd}\" failed with error code \"$err\".\n";
1023                                         }
1024                                 }
1025
1026                                 $cmd = '';
1027                                 $done = false;
1028                         }
1029                 }
1030
1031                 return true;
1032         }
1033
1034         function selectDB( $db ) {
1035                 $this->dbName = $db;
1036                 if ( $db == null || $db == $this->user ) {
1037                         return true;
1038                 }
1039                 $sql = 'ALTER SESSION SET CURRENT_SCHEMA=' . strtoupper( $db );
1040                 $stmt = oci_parse( $this->conn, $sql );
1041                 Wikimedia\suppressWarnings();
1042                 $success = oci_execute( $stmt );
1043                 Wikimedia\restoreWarnings();
1044                 if ( !$success ) {
1045                         $e = oci_error( $stmt );
1046                         if ( $e['code'] != '1435' ) {
1047                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1048                         }
1049
1050                         return false;
1051                 }
1052
1053                 return true;
1054         }
1055
1056         function strencode( $s ) {
1057                 return str_replace( "'", "''", $s );
1058         }
1059
1060         function addQuotes( $s ) {
1061                 $contLang = MediaWikiServices::getInstance()->getContentLanguage();
1062                 if ( isset( $contLang->mLoaded ) && $contLang->mLoaded ) {
1063                         $s = $contLang->checkTitleEncoding( $s );
1064                 }
1065
1066                 return "'" . $this->strencode( $s ) . "'";
1067         }
1068
1069         public function addIdentifierQuotes( $s ) {
1070                 if ( !$this->getFlag( DBO_DDLMODE ) ) {
1071                         $s = '/*Q*/' . $s;
1072                 }
1073
1074                 return $s;
1075         }
1076
1077         public function removeIdentifierQuotes( $s ) {
1078                 return strpos( $s, '/*Q*/' ) === false ? $s : substr( $s, 5 );
1079         }
1080
1081         public function isQuotedIdentifier( $s ) {
1082                 return strpos( $s, '/*Q*/' ) !== false;
1083         }
1084
1085         private function wrapFieldForWhere( $table, &$col, &$val ) {
1086                 $col_info = $this->fieldInfoMulti( $table, $col );
1087                 $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1088                 if ( $col_type == 'CLOB' ) {
1089                         $col = 'TO_CHAR(' . $col . ')';
1090                         $val =
1091                                 MediaWikiServices::getInstance()->getContentLanguage()->checkTitleEncoding( $val );
1092                 } elseif ( $col_type == 'VARCHAR2' ) {
1093                         $val =
1094                                 MediaWikiServices::getInstance()->getContentLanguage()->checkTitleEncoding( $val );
1095                 }
1096         }
1097
1098         private function wrapConditionsForWhere( $table, $conds, $parentCol = null ) {
1099                 $conds2 = [];
1100                 foreach ( $conds as $col => $val ) {
1101                         if ( is_array( $val ) ) {
1102                                 $conds2[$col] = $this->wrapConditionsForWhere( $table, $val, $col );
1103                         } else {
1104                                 if ( is_numeric( $col ) && $parentCol != null ) {
1105                                         $this->wrapFieldForWhere( $table, $parentCol, $val );
1106                                 } else {
1107                                         $this->wrapFieldForWhere( $table, $col, $val );
1108                                 }
1109                                 $conds2[$col] = $val;
1110                         }
1111                 }
1112
1113                 return $conds2;
1114         }
1115
1116         function selectRow( $table, $vars, $conds, $fname = __METHOD__,
1117                 $options = [], $join_conds = []
1118         ) {
1119                 if ( is_array( $conds ) ) {
1120                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1121                 }
1122
1123                 return parent::selectRow( $table, $vars, $conds, $fname, $options, $join_conds );
1124         }
1125
1126         /**
1127          * Returns an optional USE INDEX clause to go after the table, and a
1128          * string to go at the end of the query
1129          *
1130          * @param array $options An associative array of options to be turned into
1131          *   an SQL query, valid keys are listed in the function.
1132          * @return array
1133          */
1134         function makeSelectOptions( $options ) {
1135                 $preLimitTail = $postLimitTail = '';
1136                 $startOpts = '';
1137
1138                 $noKeyOptions = [];
1139                 foreach ( $options as $key => $option ) {
1140                         if ( is_numeric( $key ) ) {
1141                                 $noKeyOptions[$option] = true;
1142                         }
1143                 }
1144
1145                 $preLimitTail .= $this->makeGroupByWithHaving( $options );
1146
1147                 $preLimitTail .= $this->makeOrderBy( $options );
1148
1149                 if ( isset( $noKeyOptions['FOR UPDATE'] ) ) {
1150                         $postLimitTail .= ' FOR UPDATE';
1151                 }
1152
1153                 if ( isset( $noKeyOptions['DISTINCT'] ) || isset( $noKeyOptions['DISTINCTROW'] ) ) {
1154                         $startOpts .= 'DISTINCT';
1155                 }
1156
1157                 if ( isset( $options['USE INDEX'] ) && !is_array( $options['USE INDEX'] ) ) {
1158                         $useIndex = $this->useIndexClause( $options['USE INDEX'] );
1159                 } else {
1160                         $useIndex = '';
1161                 }
1162
1163                 if ( isset( $options['IGNORE INDEX'] ) && !is_array( $options['IGNORE INDEX'] ) ) {
1164                         $ignoreIndex = $this->ignoreIndexClause( $options['IGNORE INDEX'] );
1165                 } else {
1166                         $ignoreIndex = '';
1167                 }
1168
1169                 return [ $startOpts, $useIndex, $preLimitTail, $postLimitTail, $ignoreIndex ];
1170         }
1171
1172         public function delete( $table, $conds, $fname = __METHOD__ ) {
1173                 global $wgActorTableSchemaMigrationStage;
1174
1175                 if ( is_array( $conds ) ) {
1176                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1177                 }
1178                 // a hack for deleting pages, users and images (which have non-nullable FKs)
1179                 // all deletions on these tables have transactions so final failure rollbacks these updates
1180                 // @todo: Normalize the schema to match MySQL, no special FKs and such
1181                 $table = $this->tableName( $table );
1182                 if ( $table == $this->tableName( 'user' ) && $wgActorTableSchemaMigrationStage < MIGRATION_NEW ) {
1183                         $this->update( 'archive', [ 'ar_user' => 0 ],
1184                                 [ 'ar_user' => $conds['user_id'] ], $fname );
1185                         $this->update( 'ipblocks', [ 'ipb_user' => 0 ],
1186                                 [ 'ipb_user' => $conds['user_id'] ], $fname );
1187                         $this->update( 'image', [ 'img_user' => 0 ],
1188                                 [ 'img_user' => $conds['user_id'] ], $fname );
1189                         $this->update( 'oldimage', [ 'oi_user' => 0 ],
1190                                 [ 'oi_user' => $conds['user_id'] ], $fname );
1191                         $this->update( 'filearchive', [ 'fa_deleted_user' => 0 ],
1192                                 [ 'fa_deleted_user' => $conds['user_id'] ], $fname );
1193                         $this->update( 'filearchive', [ 'fa_user' => 0 ],
1194                                 [ 'fa_user' => $conds['user_id'] ], $fname );
1195                         $this->update( 'uploadstash', [ 'us_user' => 0 ],
1196                                 [ 'us_user' => $conds['user_id'] ], $fname );
1197                         $this->update( 'recentchanges', [ 'rc_user' => 0 ],
1198                                 [ 'rc_user' => $conds['user_id'] ], $fname );
1199                         $this->update( 'logging', [ 'log_user' => 0 ],
1200                                 [ 'log_user' => $conds['user_id'] ], $fname );
1201                 } elseif ( $table == $this->tableName( 'image' ) ) {
1202                         $this->update( 'oldimage', [ 'oi_name' => 0 ],
1203                                 [ 'oi_name' => $conds['img_name'] ], $fname );
1204                 }
1205
1206                 return parent::delete( $table, $conds, $fname );
1207         }
1208
1209         /**
1210          * @param string $table
1211          * @param array $values
1212          * @param array $conds
1213          * @param string $fname
1214          * @param array $options
1215          * @return bool
1216          * @throws DBUnexpectedError
1217          */
1218         function update( $table, $values, $conds, $fname = __METHOD__, $options = [] ) {
1219                 $table = $this->tableName( $table );
1220                 $opts = $this->makeUpdateOptions( $options );
1221                 $sql = "UPDATE $opts $table SET ";
1222
1223                 $first = true;
1224                 foreach ( $values as $col => &$val ) {
1225                         $sqlSet = $this->fieldBindStatement( $table, $col, $val, true );
1226
1227                         if ( !$first ) {
1228                                 $sqlSet = ', ' . $sqlSet;
1229                         } else {
1230                                 $first = false;
1231                         }
1232                         $sql .= $sqlSet;
1233                 }
1234
1235                 if ( $conds !== [] && $conds !== '*' ) {
1236                         $conds = $this->wrapConditionsForWhere( $table, $conds );
1237                         $sql .= ' WHERE ' . $this->makeList( $conds, LIST_AND );
1238                 }
1239
1240                 $this->mLastResult = $stmt = oci_parse( $this->conn, $sql );
1241                 if ( $stmt === false ) {
1242                         $e = oci_error( $this->conn );
1243                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1244
1245                         return false;
1246                 }
1247                 foreach ( $values as $col => &$val ) {
1248                         $col_info = $this->fieldInfoMulti( $table, $col );
1249                         $col_type = $col_info != false ? $col_info->type() : 'CONSTANT';
1250
1251                         if ( $val === null ) {
1252                                 // do nothing ... null was inserted in statement creation
1253                         } elseif ( $col_type != 'BLOB' && $col_type != 'CLOB' ) {
1254                                 if ( is_object( $val ) ) {
1255                                         $val = $val->getData();
1256                                 }
1257
1258                                 if ( preg_match( '/^timestamp.*/i', $col_type ) == 1 && strtolower( $val ) == 'infinity' ) {
1259                                         $val = '31-12-2030 12:00:00.000000';
1260                                 }
1261
1262                                 $val = MediaWikiServices::getInstance()->getContentLanguage()->
1263                                         checkTitleEncoding( $val );
1264                                 if ( oci_bind_by_name( $stmt, ":$col", $val ) === false ) {
1265                                         $e = oci_error( $stmt );
1266                                         $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1267
1268                                         return false;
1269                                 }
1270                         } else {
1271                                 /** @var OCI_Lob[] $lob */
1272                                 $lob[$col] = oci_new_descriptor( $this->conn, OCI_D_LOB );
1273                                 if ( $lob[$col] === false ) {
1274                                         $e = oci_error( $stmt );
1275                                         throw new DBUnexpectedError( $this, "Cannot create LOB descriptor: " . $e['message'] );
1276                                 }
1277
1278                                 if ( is_object( $val ) ) {
1279                                         $val = $val->getData();
1280                                 }
1281
1282                                 if ( $col_type == 'BLOB' ) {
1283                                         $lob[$col]->writeTemporary( $val );
1284                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, SQLT_BLOB );
1285                                 } else {
1286                                         $lob[$col]->writeTemporary( $val );
1287                                         oci_bind_by_name( $stmt, ":$col", $lob[$col], -1, OCI_B_CLOB );
1288                                 }
1289                         }
1290                 }
1291
1292                 Wikimedia\suppressWarnings();
1293
1294                 if ( oci_execute( $stmt, $this->execFlags() ) === false ) {
1295                         $e = oci_error( $stmt );
1296                         if ( !$this->ignoreDupValOnIndex || $e['code'] != '1' ) {
1297                                 $this->reportQueryError( $e['message'], $e['code'], $sql, __METHOD__ );
1298
1299                                 return false;
1300                         } else {
1301                                 $this->mAffectedRows = oci_num_rows( $stmt );
1302                         }
1303                 } else {
1304                         $this->mAffectedRows = oci_num_rows( $stmt );
1305                 }
1306
1307                 Wikimedia\restoreWarnings();
1308
1309                 if ( isset( $lob ) ) {
1310                         foreach ( $lob as $lob_v ) {
1311                                 $lob_v->free();
1312                         }
1313                 }
1314
1315                 if ( !$this->trxLevel ) {
1316                         oci_commit( $this->conn );
1317                 }
1318
1319                 return oci_free_statement( $stmt );
1320         }
1321
1322         function bitNot( $field ) {
1323                 // expecting bit-fields smaller than 4bytes
1324                 return 'BITNOT(' . $field . ')';
1325         }
1326
1327         function bitAnd( $fieldLeft, $fieldRight ) {
1328                 return 'BITAND(' . $fieldLeft . ', ' . $fieldRight . ')';
1329         }
1330
1331         function bitOr( $fieldLeft, $fieldRight ) {
1332                 return 'BITOR(' . $fieldLeft . ', ' . $fieldRight . ')';
1333         }
1334
1335         function getDBname() {
1336                 return $this->dbName;
1337         }
1338
1339         function getServer() {
1340                 return $this->server;
1341         }
1342
1343         public function buildGroupConcatField(
1344                 $delim, $table, $field, $conds = '', $join_conds = []
1345         ) {
1346                 $fld = "LISTAGG($field," . $this->addQuotes( $delim ) . ") WITHIN GROUP (ORDER BY $field)";
1347
1348                 return '(' . $this->selectSQLText( $table, $fld, $conds, null, [], $join_conds ) . ')';
1349         }
1350
1351         public function buildSubstring( $input, $startPosition, $length = null ) {
1352                 $this->assertBuildSubstringParams( $startPosition, $length );
1353                 $params = [ $input, $startPosition ];
1354                 if ( $length !== null ) {
1355                         $params[] = $length;
1356                 }
1357                 return 'SUBSTR(' . implode( ',', $params ) . ')';
1358         }
1359
1360         /**
1361          * @param string $field Field or column to cast
1362          * @return string
1363          * @since 1.28
1364          */
1365         public function buildStringCast( $field ) {
1366                 return 'CAST ( ' . $field . ' AS VARCHAR2 )';
1367         }
1368
1369         public function getInfinity() {
1370                 return '31-12-2030 12:00:00.000000';
1371         }
1372 }